/mandos/trunk : revision 13

1

#!/usr/bin/python3 -b

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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.

28

#

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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)

37

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

from __future__ import division

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5

import SocketServer

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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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9

import datetime

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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 gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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import ConfigParser

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18

import sys

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19

import re

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import os

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21

import signal

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from sets import Set

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23

import subprocess

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import atexit

61

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

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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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24

82

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import dbus

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import dbus.service

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import gi

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from gi.repository import GLib

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import gobject

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import avahi

86

28

from dbus.mainloop.glib import DBusGMainLoop

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29

import ctypes

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import ctypes.util

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import xml.dom.minidom

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import inspect

91

92

if sys.version_info.major == 2:

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__metaclass__ = type

94

95

# Show warnings by default

96

if not sys.warnoptions:

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import warnings

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warnings.simplefilter("default")

99

100

# Try to find the value of SO_BINDTODEVICE:

101

try:

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

103

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

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except AttributeError:

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try:

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# This is where SO_BINDTODEVICE was up to and including Python

108

# 2.6, and also 3.2:

109

from IN import SO_BINDTODEVICE

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except ImportError:

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

112

# Try running the C preprocessor:

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try:

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

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"/dev/stdin"],

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stdin=subprocess.PIPE,

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stdout=subprocess.PIPE)

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stdout = cc.communicate(

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

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

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except (OSError, ValueError, IndexError):

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# No value found

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SO_BINDTODEVICE = None

124

125

if sys.version_info.major == 2:

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str = unicode

127

128

if sys.version_info < (3, 2):

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configparser.Configparser = configparser.SafeConfigParser

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131

version = "1.8.8"

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stored_state_file = "clients.pickle"

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134

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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138

try:

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if_nametoindex = ctypes.cdll.LoadLibrary(

140

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

141

except (OSError, AttributeError):

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143

def if_nametoindex(interface):

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

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

146

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

149

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

150

return interface_index

151

152

153

def copy_function(func):

154

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

155

if sys.version_info.major == 2:

156

return types.FunctionType(func.func_code,

157

func.func_globals,

158

func.func_name,

159

func.func_defaults,

160

func.func_closure)

161

else:

162

return types.FunctionType(func.__code__,

163

func.__globals__,

164

func.__name__,

165

func.__defaults__,

166

func.__closure__)

167

168

169

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

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"""init logger and add loglevel"""

171

172

global syslogger

173

syslogger = (logging.handlers.SysLogHandler(

174

facility=logging.handlers.SysLogHandler.LOG_DAEMON,

175

address="/dev/log"))

176

syslogger.setFormatter(logging.Formatter

177

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

178

' %(message)s'))

179

logger.addHandler(syslogger)

180

181

if debug:

182

console = logging.StreamHandler()

183

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'))

187

logger.addHandler(console)

188

logger.setLevel(level)

189

190

191

class PGPError(Exception):

192

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

193

pass

194

195

196

class PGPEngine:

197

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

198

199

def __init__(self):

200

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

201

self.gpg = "gpg"

202

try:

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

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for line in output.splitlines():

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

206

if name == b"gpg":

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self.gpg = path

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break

209

except OSError as e:

210

if e.errno != errno.ENOENT:

211

raise

212

self.gnupgargs = ['--batch',

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'--homedir', self.tempdir,

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'--force-mdc',

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'--quiet']

216

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

217

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

218

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

219

220

def __enter__(self):

221

return self

222

223

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

224

self._cleanup()

225

return False

226

227

def __del__(self):

228

self._cleanup()

229

230

def _cleanup(self):

231

if self.tempdir is not None:

232

# Delete contents of tempdir

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

234

topdown=False):

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for filename in files:

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

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for dirname in dirs:

238

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

239

# Remove tempdir

240

os.rmdir(self.tempdir)

241

self.tempdir = None

242

243

def password_encode(self, password):

244

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

245

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

246

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

247

if len(encoded) > 2048:

248

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

249

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

250

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

251

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

252

return encoded

253

254

def encrypt(self, data, password):

255

passphrase = self.password_encode(password)

256

with tempfile.NamedTemporaryFile(

257

dir=self.tempdir) as passfile:

258

passfile.write(passphrase)

259

passfile.flush()

260

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

261

'--passphrase-file',

262

passfile.name]

263

+ self.gnupgargs,

264

stdin=subprocess.PIPE,

265

stdout=subprocess.PIPE,

266

stderr=subprocess.PIPE)

267

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

268

if proc.returncode != 0:

269

raise PGPError(err)

270

return ciphertext

271

272

def decrypt(self, data, password):

273

passphrase = self.password_encode(password)

274

with tempfile.NamedTemporaryFile(

275

dir=self.tempdir) as passfile:

276

passfile.write(passphrase)

277

passfile.flush()

278

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

279

'--passphrase-file',

280

passfile.name]

281

+ self.gnupgargs,

282

stdin=subprocess.PIPE,

283

stdout=subprocess.PIPE,

284

stderr=subprocess.PIPE)

285

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

286

if proc.returncode != 0:

287

raise PGPError(err)

288

return decrypted_plaintext

289

290

291

# Pretend that we have an Avahi module

292

class avahi:

293

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

294

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

295

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

296

PROTO_INET = 0 # avahi-common/address.h

297

PROTO_INET6 = 1 # avahi-common/address.h

298

DBUS_NAME = "org.freedesktop.Avahi"

299

DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

300

DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

301

DBUS_PATH_SERVER = "/"

302

303

@staticmethod

304

def string_array_to_txt_array(t):

305

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

306

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

307

ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

308

ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

309

ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

310

SERVER_INVALID = 0 # avahi-common/defs.h

311

SERVER_REGISTERING = 1 # avahi-common/defs.h

312

SERVER_RUNNING = 2 # avahi-common/defs.h

313

SERVER_COLLISION = 3 # avahi-common/defs.h

314

SERVER_FAILURE = 4 # avahi-common/defs.h

315

316

317

class AvahiError(Exception):

318

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

319

self.value = value

320

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

321

**kwargs)

322

323

324

class AvahiServiceError(AvahiError):

325

pass

326

327

328

class AvahiGroupError(AvahiError):

329

pass

330

331

332

class AvahiService:

333

"""An Avahi (Zeroconf) service.

334

335

Attributes:

336

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

337

Used to optionally bind to the specified interface.

338

339

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

340

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

341

port: integer; what port to announce

342

TXT: list of strings; TXT record for the service

343

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

344

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

345

max_renames: integer; maximum number of renames

346

rename_count: integer; counter so we only rename after collisions

347

a sensible number of times

348

group: D-Bus Entry Group

349

server: D-Bus Server

350

bus: dbus.SystemBus()

351

"""

352

353

def __init__(self,

354

interface=avahi.IF_UNSPEC,

355

name=None,

356

servicetype=None,

357

port=None,

358

TXT=None,

359

domain="",

360

host="",

361

max_renames=32768,

362

protocol=avahi.PROTO_UNSPEC,

363

bus=None):

364

self.interface = interface

365

self.name = name

366

self.type = servicetype

367

self.port = port

368

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

369

self.domain = domain

370

self.host = host

371

self.rename_count = 0

372

self.max_renames = max_renames

373

self.protocol = protocol

374

self.group = None # our entry group

375

self.server = None

376

self.bus = bus

377

self.entry_group_state_changed_match = None

378

379

def rename(self, remove=True):

380

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

381

if self.rename_count >= self.max_renames:

382

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

383

" after %i retries, exiting.",

384

self.rename_count)

385

raise AvahiServiceError("Too many renames")

386

self.name = str(

387

self.server.GetAlternativeServiceName(self.name))

388

self.rename_count += 1

389

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

390

self.name)

391

if remove:

392

self.remove()

393

try:

394

self.add()

395

except dbus.exceptions.DBusException as error:

396

if (error.get_dbus_name()

397

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

398

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

399

return self.rename(remove=False)

400

else:

401

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

402

self.cleanup()

403

os._exit(1)

404

405

def remove(self):

406

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

407

if self.entry_group_state_changed_match is not None:

408

self.entry_group_state_changed_match.remove()

409

self.entry_group_state_changed_match = None

410

if self.group is not None:

411

self.group.Reset()

412

413

def add(self):

414

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

415

self.remove()

416

if self.group is None:

417

self.group = dbus.Interface(

418

self.bus.get_object(avahi.DBUS_NAME,

419

self.server.EntryGroupNew()),

420

avahi.DBUS_INTERFACE_ENTRY_GROUP)

421

self.entry_group_state_changed_match = (

422

self.group.connect_to_signal(

423

'StateChanged', self.entry_group_state_changed))

424

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

425

self.name, self.type)

426

self.group.AddService(

427

self.interface,

428

self.protocol,

429

dbus.UInt32(0), # flags

430

self.name, self.type,

431

self.domain, self.host,

432

dbus.UInt16(self.port),

433

avahi.string_array_to_txt_array(self.TXT))

434

self.group.Commit()

435

436

def entry_group_state_changed(self, state, error):

437

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

438

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

439

440

if state == avahi.ENTRY_GROUP_ESTABLISHED:

441

logger.debug("Zeroconf service established.")

442

elif state == avahi.ENTRY_GROUP_COLLISION:

443

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

444

self.rename()

445

elif state == avahi.ENTRY_GROUP_FAILURE:

446

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

447

str(error))

448

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

449

450

def cleanup(self):

451

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

452

if self.group is not None:

453

try:

454

self.group.Free()

455

except (dbus.exceptions.UnknownMethodException,

456

dbus.exceptions.DBusException):

457

pass

458

self.group = None

459

self.remove()

460

461

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

462

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

463

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

464

bad_states = {

465

avahi.SERVER_INVALID: "Zeroconf server invalid",

466

avahi.SERVER_REGISTERING: None,

467

avahi.SERVER_COLLISION: "Zeroconf server name collision",

468

avahi.SERVER_FAILURE: "Zeroconf server failure",

469

}

470

if state in bad_states:

471

if bad_states[state] is not None:

472

if error is None:

473

logger.error(bad_states[state])

474

else:

475

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

476

self.cleanup()

477

elif state == avahi.SERVER_RUNNING:

478

try:

479

self.add()

480

except dbus.exceptions.DBusException as error:

481

if (error.get_dbus_name()

482

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

483

logger.info("Local Zeroconf service name"

484

" collision.")

485

return self.rename(remove=False)

486

else:

487

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

488

self.cleanup()

489

os._exit(1)

490

else:

491

if error is None:

492

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

493

else:

494

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

495

496

def activate(self):

497

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

498

if self.server is None:

499

self.server = dbus.Interface(

500

self.bus.get_object(avahi.DBUS_NAME,

501

avahi.DBUS_PATH_SERVER,

502

follow_name_owner_changes=True),

503

avahi.DBUS_INTERFACE_SERVER)

504

self.server.connect_to_signal("StateChanged",

505

self.server_state_changed)

506

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

507

508

509

class AvahiServiceToSyslog(AvahiService):

510

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

511

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

512

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

513

syslogger.setFormatter(logging.Formatter(

514

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

515

.format(self.name)))

516

return ret

517

518

519

# Pretend that we have a GnuTLS module

520

class gnutls:

521

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

522

523

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

524

if library is None:

525

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

526

_library = ctypes.cdll.LoadLibrary(library)

527

del library

528

529

# Unless otherwise indicated, the constants and types below are

530

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

531

532

# Constants

533

E_SUCCESS = 0

534

E_INTERRUPTED = -52

535

E_AGAIN = -28

536

CRT_OPENPGP = 2

537

CRT_RAWPK = 3

538

CLIENT = 2

539

SHUT_RDWR = 0

540

CRD_CERTIFICATE = 1

541

E_NO_CERTIFICATE_FOUND = -49

542

X509_FMT_DER = 0

543

NO_TICKETS = 1<<10

544

ENABLE_RAWPK = 1<<18

545

CTYPE_PEERS = 3

546

KEYID_USE_SHA256 = 1 # gnutls/x509.h

547

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

548

549

# Types

550

class session_int(ctypes.Structure):

551

_fields_ = []

552

session_t = ctypes.POINTER(session_int)

553

554

class certificate_credentials_st(ctypes.Structure):

555

_fields_ = []

556

certificate_credentials_t = ctypes.POINTER(

557

certificate_credentials_st)

558

certificate_type_t = ctypes.c_int

559

560

class datum_t(ctypes.Structure):

561

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

562

('size', ctypes.c_uint)]

563

564

class openpgp_crt_int(ctypes.Structure):

565

_fields_ = []

566

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

567

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

568

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

569

credentials_type_t = ctypes.c_int

570

transport_ptr_t = ctypes.c_void_p

571

close_request_t = ctypes.c_int

572

573

# Exceptions

574

class Error(Exception):

575

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

576

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

577

# code is passed, convert it to a string with

578

# gnutls.strerror()

579

self.code = code

580

if message is None and code is not None:

581

message = gnutls.strerror(code)

582

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

583

message, *args)

584

585

class CertificateSecurityError(Error):

586

pass

587

588

# Classes

589

class Credentials:

590

def __init__(self):

591

self._c_object = gnutls.certificate_credentials_t()

592

gnutls.certificate_allocate_credentials(

593

ctypes.byref(self._c_object))

594

self.type = gnutls.CRD_CERTIFICATE

595

596

def __del__(self):

597

gnutls.certificate_free_credentials(self._c_object)

598

599

class ClientSession:

600

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

601

self._c_object = gnutls.session_t()

602

gnutls_flags = gnutls.CLIENT

603

if gnutls.check_version(b"3.5.6"):

604

gnutls_flags |= gnutls.NO_TICKETS

605

if gnutls.has_rawpk:

606

gnutls_flags |= gnutls.ENABLE_RAWPK

607

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

608

del gnutls_flags

609

gnutls.set_default_priority(self._c_object)

610

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

611

gnutls.handshake_set_private_extensions(self._c_object,

612

True)

613

self.socket = socket

614

if credentials is None:

615

credentials = gnutls.Credentials()

616

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

617

ctypes.cast(credentials._c_object,

618

ctypes.c_void_p))

619

self.credentials = credentials

620

621

def __del__(self):

622

gnutls.deinit(self._c_object)

623

624

def handshake(self):

625

return gnutls.handshake(self._c_object)

626

627

def send(self, data):

628

data = bytes(data)

629

data_len = len(data)

630

while data_len > 0:

631

data_len -= gnutls.record_send(self._c_object,

632

data[-data_len:],

633

data_len)

634

635

def bye(self):

636

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

637

638

# Error handling functions

639

def _error_code(result):

640

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

641

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

642

if result >= 0:

643

return result

644

if result == gnutls.E_NO_CERTIFICATE_FOUND:

645

raise gnutls.CertificateSecurityError(code=result)

646

raise gnutls.Error(code=result)

647

648

def _retry_on_error(result, func, arguments):

649

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

650

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

651

while result < 0:

652

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

653

return _error_code(result)

654

result = func(*arguments)

655

return result

656

657

# Unless otherwise indicated, the function declarations below are

658

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

659

660

# Functions

661

priority_set_direct = _library.gnutls_priority_set_direct

662

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

663

ctypes.POINTER(ctypes.c_char_p)]

664

priority_set_direct.restype = _error_code

665

666

init = _library.gnutls_init

667

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

668

init.restype = _error_code

669

670

set_default_priority = _library.gnutls_set_default_priority

671

set_default_priority.argtypes = [session_t]

672

set_default_priority.restype = _error_code

673

674

record_send = _library.gnutls_record_send

675

record_send.argtypes = [session_t, ctypes.c_void_p,

676

ctypes.c_size_t]

677

record_send.restype = ctypes.c_ssize_t

678

record_send.errcheck = _retry_on_error

679

680

certificate_allocate_credentials = (

681

_library.gnutls_certificate_allocate_credentials)

682

certificate_allocate_credentials.argtypes = [

683

ctypes.POINTER(certificate_credentials_t)]

684

certificate_allocate_credentials.restype = _error_code

685

686

certificate_free_credentials = (

687

_library.gnutls_certificate_free_credentials)

688

certificate_free_credentials.argtypes = [

689

certificate_credentials_t]

690

certificate_free_credentials.restype = None

691

692

handshake_set_private_extensions = (

693

_library.gnutls_handshake_set_private_extensions)

694

handshake_set_private_extensions.argtypes = [session_t,

695

ctypes.c_int]

696

handshake_set_private_extensions.restype = None

697

698

credentials_set = _library.gnutls_credentials_set

699

credentials_set.argtypes = [session_t, credentials_type_t,

700

ctypes.c_void_p]

701

credentials_set.restype = _error_code

702

703

strerror = _library.gnutls_strerror

704

strerror.argtypes = [ctypes.c_int]

705

strerror.restype = ctypes.c_char_p

706

707

certificate_type_get = _library.gnutls_certificate_type_get

708

certificate_type_get.argtypes = [session_t]

709

certificate_type_get.restype = _error_code

710

711

certificate_get_peers = _library.gnutls_certificate_get_peers

712

certificate_get_peers.argtypes = [session_t,

713

ctypes.POINTER(ctypes.c_uint)]

714

certificate_get_peers.restype = ctypes.POINTER(datum_t)

715

716

global_set_log_level = _library.gnutls_global_set_log_level

717

global_set_log_level.argtypes = [ctypes.c_int]

718

global_set_log_level.restype = None

719

720

global_set_log_function = _library.gnutls_global_set_log_function

721

global_set_log_function.argtypes = [log_func]

722

global_set_log_function.restype = None

723

724

deinit = _library.gnutls_deinit

725

deinit.argtypes = [session_t]

726

deinit.restype = None

727

728

handshake = _library.gnutls_handshake

729

handshake.argtypes = [session_t]

730

handshake.restype = _error_code

731

handshake.errcheck = _retry_on_error

732

733

transport_set_ptr = _library.gnutls_transport_set_ptr

734

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

735

transport_set_ptr.restype = None

736

737

bye = _library.gnutls_bye

738

bye.argtypes = [session_t, close_request_t]

739

bye.restype = _error_code

740

bye.errcheck = _retry_on_error

741

742

check_version = _library.gnutls_check_version

743

check_version.argtypes = [ctypes.c_char_p]

744

check_version.restype = ctypes.c_char_p

745

746

_need_version = b"3.3.0"

747

if check_version(_need_version) is None:

748

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

749

.format(_need_version))

750

751

_tls_rawpk_version = b"3.6.6"

752

has_rawpk = bool(check_version(_tls_rawpk_version))

753

754

if has_rawpk:

755

# Types

756

class pubkey_st(ctypes.Structure):

757

_fields = []

758

pubkey_t = ctypes.POINTER(pubkey_st)

759

760

x509_crt_fmt_t = ctypes.c_int

761

762

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

763

pubkey_init = _library.gnutls_pubkey_init

764

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

765

pubkey_init.restype = _error_code

766

767

pubkey_import = _library.gnutls_pubkey_import

768

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

769

x509_crt_fmt_t]

770

pubkey_import.restype = _error_code

771

772

pubkey_get_key_id = _library.gnutls_pubkey_get_key_id

773

pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,

774

ctypes.POINTER(ctypes.c_ubyte),

775

ctypes.POINTER(ctypes.c_size_t)]

776

pubkey_get_key_id.restype = _error_code

777

778

pubkey_deinit = _library.gnutls_pubkey_deinit

779

pubkey_deinit.argtypes = [pubkey_t]

780

pubkey_deinit.restype = None

781

else:

782

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

783

784

openpgp_crt_init = _library.gnutls_openpgp_crt_init

785

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

786

openpgp_crt_init.restype = _error_code

787

788

openpgp_crt_import = _library.gnutls_openpgp_crt_import

789

openpgp_crt_import.argtypes = [openpgp_crt_t,

790

ctypes.POINTER(datum_t),

791

openpgp_crt_fmt_t]

792

openpgp_crt_import.restype = _error_code

793

794

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

795

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

796

ctypes.POINTER(ctypes.c_uint)]

797

openpgp_crt_verify_self.restype = _error_code

798

799

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

800

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

801

openpgp_crt_deinit.restype = None

802

803

openpgp_crt_get_fingerprint = (

804

_library.gnutls_openpgp_crt_get_fingerprint)

805

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

806

ctypes.c_void_p,

807

ctypes.POINTER(

808

ctypes.c_size_t)]

809

openpgp_crt_get_fingerprint.restype = _error_code

810

811

if check_version(b"3.6.4"):

812

certificate_type_get2 = _library.gnutls_certificate_type_get2

813

certificate_type_get2.argtypes = [session_t, ctypes.c_int]

814

certificate_type_get2.restype = _error_code

815

816

# Remove non-public functions

817

del _error_code, _retry_on_error

818

819

820

def call_pipe(connection, # : multiprocessing.Connection

821

func, *args, **kwargs):

822

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

823

824

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

825

return value on the provided multiprocessing.Connection.

826

"""

827

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

828

connection.close()

829

830

831

class Client:

30

31

import logging

32

import logging.handlers

33

34

# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')

35

36

logger = logging.Logger('mandos')

37

logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))

38

39

# This variable is used to optionally bind to a specified interface.

40

# It is a global variable to fit in with the other variables from the

41

# Avahi server example code.

42

serviceInterface = avahi.IF_UNSPEC

43

# From the Avahi server example code:

44

serviceName = "Mandos"

45

serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html

46

servicePort = None # Not known at startup

47

serviceTXT = [] # TXT record for the service

48

domain = "" # Domain to publish on, default to .local

49

host = "" # Host to publish records for, default to localhost

50

group = None #our entry group

51

rename_count = 12 # Counter so we only rename after collisions a

52

# sensible number of times

53

# End of Avahi example code

54

55

56

class Client(object):

832

57

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

833

834

58

Attributes:

835

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

836

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

837

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

838

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

839

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

840

running.

841

checker_callback_tag: a GLib event source tag, or None

842

checker_command: string; External command which is run to check

843

if client lives. %() expansions are done at

59

60

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

61

uniquely identify the client

62

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

63

fqdn: string (FQDN); available for use by the checker command

64

created: datetime.datetime()

65

last_seen: datetime.datetime() or None if not yet seen

66

timeout: datetime.timedelta(); How long from last_seen until

67

this client is invalid

68

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

69

stop_hook: If set, called by stop() as stop_hook(self)

70

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

71

to see if the client lives.

72

Is None if no process is running.

73

checker_initiator_tag: a gobject event source tag, or None

74

stop_initiator_tag: - '' -

75

checker_callback_tag: - '' -

76

checker_command: string; External command which is run to check if

77

client lives. %()s expansions are done at

844

78

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

845

79

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

846

checker_initiator_tag: a GLib event source tag, or None

847

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

848

client_structure: Object describing what attributes a client has

849

and is used for storing the client at exit

850

current_checker_command: string; current running checker_command

851

disable_initiator_tag: a GLib event source tag, or None

852

enabled: bool()

853

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

854

uniquely identify an OpenPGP client

855

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

856

a client using raw public keys

857

host: string; available for use by the checker command

858

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

859

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

860

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

861

last_checker_status: integer between 0 and 255 reflecting exit

862

status of last checker. -1 reflects crashed

863

checker, -2 means no checker completed yet.

864

last_checker_signal: The signal which killed the last checker, if

865

last_checker_status is -1

866

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

867

868

D-Bus identifiers

869

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

870

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

871

until this client is disabled

872

extended_timeout: extra long timeout when secret has been sent

873

runtime_expansions: Allowed attributes for runtime expansion.

874

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

875

disabled, or None

876

server_settings: The server_settings dict from main()

80

Private attibutes:

81

_timeout: Real variable for 'timeout'

82

_interval: Real variable for 'interval'

83

_timeout_milliseconds: Used by gobject.timeout_add()

84

_interval_milliseconds: - '' -

877

85

"""

878

879

runtime_expansions = ("approval_delay", "approval_duration",

880

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

881

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

882

"last_approval_request", "last_checked_ok",

883

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

884

client_defaults = {

885

"timeout": "PT5M",

886

"extended_timeout": "PT15M",

887

"interval": "PT2M",

888

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

889

"host": "",

890

"approval_delay": "PT0S",

891

"approval_duration": "PT1S",

892

"approved_by_default": "True",

893

"enabled": "True",

894

}

895

896

@staticmethod

897

def config_parser(config):

898

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

899

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

900

with exceptions for any special settings as defined above.

901

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

902

value given the same arguments.

903

"""

904

settings = {}

905

for client_name in config.sections():

906

section = dict(config.items(client_name))

907

client = settings[client_name] = {}

908

909

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

910

# Reformat values from string types to Python types

911

client["approved_by_default"] = config.getboolean(

912

client_name, "approved_by_default")

913

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

914

"enabled")

915

916

# Uppercase and remove spaces from key_id and fingerprint

917

# for later comparison purposes with return value from the

918

# key_id() and fingerprint() functions

919

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

920

.replace(" ", ""))

921

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

922

.replace(" ", ""))

923

if "secret" in section:

924

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

925

.encode("utf-8"),

926

"base64")

927

elif "secfile" in section:

928

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

929

(section["secfile"])),

930

"rb") as secfile:

931

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

932

else:

933

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

934

.format(section))

935

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

936

client["extended_timeout"] = string_to_delta(

937

section["extended_timeout"])

938

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

939

client["approval_delay"] = string_to_delta(

940

section["approval_delay"])

941

client["approval_duration"] = string_to_delta(

942

section["approval_duration"])

943

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

944

client["last_approval_request"] = None

945

client["last_checked_ok"] = None

946

client["last_checker_status"] = -2

947

948

return settings

949

950

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

86

def _set_timeout(self, timeout):

87

"Setter function for 'timeout' attribute"

88

self._timeout = timeout

89

self._timeout_milliseconds = ((self.timeout.days

90

* 24 * 60 * 60 * 1000)

91

+ (self.timeout.seconds * 1000)

92

+ (self.timeout.microseconds

93

// 1000))

94

timeout = property(lambda self: self._timeout,

95

_set_timeout)

96

del _set_timeout

97

def _set_interval(self, interval):

98

"Setter function for 'interval' attribute"

99

self._interval = interval

100

self._interval_milliseconds = ((self.interval.days

101

* 24 * 60 * 60 * 1000)

102

+ (self.interval.seconds

103

* 1000)

104

+ (self.interval.microseconds

105

// 1000))

106

interval = property(lambda self: self._interval,

107

_set_interval)

108

del _set_interval

109

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

110

fingerprint=None, secret=None, secfile=None, fqdn=None,

111

timeout=None, interval=-1, checker=None):

951

112

self.name = name

952

if server_settings is None:

953

server_settings = {}

954

self.server_settings = server_settings

955

# adding all client settings

956

for setting, value in settings.items():

957

setattr(self, setting, value)

958

959

if self.enabled:

960

if not hasattr(self, "last_enabled"):

961

self.last_enabled = datetime.datetime.utcnow()

962

if not hasattr(self, "expires"):

963

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

964

+ self.timeout)

965

else:

966

self.last_enabled = None

967

self.expires = None

968

969

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

970

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

971

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

972

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

973

datetime.datetime.utcnow())

974

975

# attributes specific for this server instance

113

# Uppercase and remove spaces from fingerprint

114

# for later comparison purposes with return value of

115

# the fingerprint() function

116

self.fingerprint = fingerprint.upper().replace(u" ", u"")

117

if secret:

118

self.secret = secret.decode(u"base64")

119

elif secfile:

120

sf = open(secfile)

121

self.secret = sf.read()

122

sf.close()

123

else:

124

raise RuntimeError(u"No secret or secfile for client %s"

125

% self.name)

126

self.fqdn = fqdn # string

127

self.created = datetime.datetime.now()

128

self.last_seen = None

129

if timeout is None:

130

timeout = options.timeout

131

self.timeout = timeout

132

if interval == -1:

133

interval = options.interval

134

else:

135

interval = string_to_delta(interval)

136

self.interval = interval

137

self.stop_hook = stop_hook

976

138

self.checker = None

977

139

self.checker_initiator_tag = None

978

self.disable_initiator_tag = None

140

self.stop_initiator_tag = None

979

141

self.checker_callback_tag = None

980

self.current_checker_command = None

981

self.approved = None

982

self.approvals_pending = 0

983

self.changedstate = multiprocessing_manager.Condition(

984

multiprocessing_manager.Lock())

985

self.client_structure = [attr

986

for attr in self.__dict__.keys()

987

if not attr.startswith("_")]

988

self.client_structure.append("client_structure")

989

990

for name, t in inspect.getmembers(

991

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

992

if not name.startswith("_"):

993

self.client_structure.append(name)

994

995

# Send notice to process children that client state has changed

996

def send_changedstate(self):

997

with self.changedstate:

998

self.changedstate.notify_all()

999

1000

def enable(self):

1001

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

1002

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

1003

# Already enabled

1004

return

1005

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

1006

self.enabled = True

1007

self.last_enabled = datetime.datetime.utcnow()

1008

self.init_checker()

1009

self.send_changedstate()

1010

1011

def disable(self, quiet=True):

1012

"""Disable this client."""

1013

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

1014

return False

1015

if not quiet:

1016

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

1017

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

1018

GLib.source_remove(self.disable_initiator_tag)

1019

self.disable_initiator_tag = None

1020

self.expires = None

1021

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

1022

GLib.source_remove(self.checker_initiator_tag)

1023

self.checker_initiator_tag = None

1024

self.stop_checker()

1025

self.enabled = False

1026

if not quiet:

1027

self.send_changedstate()

1028

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

1029

return False

1030

1031

def __del__(self):

1032

self.disable()

1033

1034

def init_checker(self):

142

self.check_command = checker

143

def start(self):

144

"""Start this clients checker and timeout hooks"""

1035

145

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

1036

146

# and every interval from then on.

1037

if self.checker_initiator_tag is not None:

1038

GLib.source_remove(self.checker_initiator_tag)

1039

self.checker_initiator_tag = GLib.timeout_add(

1040

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

1041

self.start_checker)

1042

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

1043

if self.disable_initiator_tag is not None:

1044

GLib.source_remove(self.disable_initiator_tag)

1045

self.disable_initiator_tag = GLib.timeout_add(

1046

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

147

self.checker_initiator_tag = gobject.timeout_add\

148

(self._interval_milliseconds,

149

self.start_checker)

1047

150

# Also start a new checker *right now*.

1048

151

self.start_checker()

1049

1050

def checker_callback(self, source, condition, connection,

1051

command):

152

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

153

self.stop_initiator_tag = gobject.timeout_add\

154

(self._timeout_milliseconds,

155

self.stop)

156

def stop(self):

157

"""Stop this client.

158

The possibility that this client might be restarted is left

159

open, but not currently used."""

160

logger.debug(u"Stopping client %s", self.name)

161

self.secret = None

162

if self.stop_initiator_tag:

163

gobject.source_remove(self.stop_initiator_tag)

164

self.stop_initiator_tag = None

165

if self.checker_initiator_tag:

166

gobject.source_remove(self.checker_initiator_tag)

167

self.checker_initiator_tag = None

168

self.stop_checker()

169

if self.stop_hook:

170

self.stop_hook(self)

171

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

172

return False

173

def __del__(self):

174

# Some code duplication here and in stop()

175

if hasattr(self, "stop_initiator_tag") \

176

and self.stop_initiator_tag:

177

gobject.source_remove(self.stop_initiator_tag)

178

self.stop_initiator_tag = None

179

if hasattr(self, "checker_initiator_tag") \

180

and self.checker_initiator_tag:

181

gobject.source_remove(self.checker_initiator_tag)

182

self.checker_initiator_tag = None

183

self.stop_checker()

184

def checker_callback(self, pid, condition):

1052

185

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

1053

# Read return code from connection (see call_pipe)

1054

returncode = connection.recv()

1055

connection.close()

1056

self.checker.join()

1057

self.checker_callback_tag = None

1058

self.checker = None

1059

1060

if returncode >= 0:

1061

self.last_checker_status = returncode

1062

self.last_checker_signal = None

1063

if self.last_checker_status == 0:

1064

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

1065

vars(self))

1066

self.checked_ok()

1067

else:

1068

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

1069

else:

1070

self.last_checker_status = -1

1071

self.last_checker_signal = -returncode

1072

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

186

now = datetime.datetime.now()

187

if os.WIFEXITED(condition) \

188

and (os.WEXITSTATUS(condition) == 0):

189

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

190

vars(self))

191

self.last_seen = now

192

gobject.source_remove(self.stop_initiator_tag)

193

self.stop_initiator_tag = gobject.timeout_add\

194

(self._timeout_milliseconds,

195

self.stop)

196

if not os.WIFEXITED(condition):

197

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

1073

198

vars(self))

1074

return False

1075

1076

def checked_ok(self):

1077

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

1078

self.last_checked_ok = datetime.datetime.utcnow()

1079

self.last_checker_status = 0

1080

self.last_checker_signal = None

1081

self.bump_timeout()

1082

1083

def bump_timeout(self, timeout=None):

1084

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

1085

if timeout is None:

1086

timeout = self.timeout

1087

if self.disable_initiator_tag is not None:

1088

GLib.source_remove(self.disable_initiator_tag)

1089

self.disable_initiator_tag = None

1090

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

1091

self.disable_initiator_tag = GLib.timeout_add(

1092

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

1093

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

1094

1095

def need_approval(self):

1096

self.last_approval_request = datetime.datetime.utcnow()

1097

199

else:

200

logger.debug(u"Checker for %(name)s failed",

201

vars(self))

202

self.checker = None

203

self.checker_callback_tag = None

1098

204

def start_checker(self):

1099

205

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

1100

1101

206

If a checker already exists, leave it running and do

1102

207

nothing."""

1103

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

1104

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

1105

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

1106

# would inevitably timeout, since no checker would get a

1107

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

1108

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

1109

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

1110

# should be.

1111

1112

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

1113

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

1114

self.checker.join()

1115

self.checker = None

1116

# Start a new checker if needed

1117

208

if self.checker is None:

1118

# Escape attributes for the shell

1119

escaped_attrs = {

1120

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

1121

for attr in self.runtime_expansions}

1122

try:

1123

command = self.checker_command % escaped_attrs

1124

except TypeError as error:

1125

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

1126

self.checker_command,

1127

exc_info=error)

1128

return True # Try again later

1129

self.current_checker_command = command

1130

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

1131

self.name)

1132

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

1133

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

1134

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

1135

# always replaced by /dev/null.)

1136

# The exception is when not debugging but nevertheless

1137

# running in the foreground; use the previously

1138

# created wnull.

1139

popen_args = {"close_fds": True,

1140

"shell": True,

1141

"cwd": "/"}

1142

if (not self.server_settings["debug"]

1143

and self.server_settings["foreground"]):

1144

popen_args.update({"stdout": wnull,

1145

"stderr": wnull})

1146

pipe = multiprocessing.Pipe(duplex=False)

1147

self.checker = multiprocessing.Process(

1148

target=call_pipe,

1149

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

1150

kwargs=popen_args)

1151

self.checker.start()

1152

self.checker_callback_tag = GLib.io_add_watch(

1153

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

1154

GLib.PRIORITY_DEFAULT, GLib.IO_IN,

1155

self.checker_callback, pipe[0], command)

1156

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

209

logger.debug(u"Starting checker for %s",

210

self.name)

211

try:

212

command = self.check_command % self.fqdn

213

except TypeError:

214

escaped_attrs = dict((key, re.escape(str(val)))

215

for key, val in

216

vars(self).iteritems())

217

try:

218

command = self.check_command % escaped_attrs

219

except TypeError, error:

220

logger.critical(u'Could not format string "%s": %s',

221

self.check_command, error)

222

return True # Try again later

223

try:

224

self.checker = subprocess.\

225

Popen(command,

226

stdout=subprocess.PIPE,

227

close_fds=True, shell=True,

228

cwd="/")

229

self.checker_callback_tag = gobject.\

230

child_watch_add(self.checker.pid,

231

self.\

232

checker_callback)

233

except subprocess.OSError, error:

234

logger.error(u"Failed to start subprocess: %s",

235

error)

236

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

1157

237

return True

1158

1159

238

def stop_checker(self):

1160

239

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

1161

if self.checker_callback_tag:

1162

GLib.source_remove(self.checker_callback_tag)

1163

self.checker_callback_tag = None

1164

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

240

if not hasattr(self, "checker") or self.checker is None:

1165

241

return

1166

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

1167

self.checker.terminate()

242

gobject.source_remove(self.checker_callback_tag)

243

self.checker_callback_tag = None

244

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

245

if self.checker.poll() is None:

246

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

1168

247

self.checker = None

1169

1170

1171

def dbus_service_property(dbus_interface,

1172

signature="v",

1173

access="readwrite",

1174

byte_arrays=False):

1175

"""Decorators for marking methods of a DBusObjectWithProperties to

1176

become properties on the D-Bus.

1177

1178

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

1179

and with one argument by "Set".

1180

1181

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

1182

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

1183

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

1184

"""

1185

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

1186

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

1187

if byte_arrays and signature != "ay":

1188

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

1189

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

1190

1191

def decorator(func):

1192

func._dbus_is_property = True

1193

func._dbus_interface = dbus_interface

1194

func._dbus_signature = signature

1195

func._dbus_access = access

1196

func._dbus_name = func.__name__

1197

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

1198

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

1199

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

1200

return func

1201

1202

return decorator

1203

1204

1205

def dbus_interface_annotations(dbus_interface):

1206

"""Decorator for marking functions returning interface annotations

1207

1208

Usage:

1209

1210

@dbus_interface_annotations("org.example.Interface")

1211

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

1212

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

1213

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

1214

"false"}

1215

"""

1216

1217

def decorator(func):

1218

func._dbus_is_interface = True

1219

func._dbus_interface = dbus_interface

1220

func._dbus_name = dbus_interface

1221

return func

1222

1223

return decorator

1224

1225

1226

def dbus_annotations(annotations):

1227

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

1228

Usage:

1229

1230

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

1231

"org.freedesktop.DBus.Property."

1232

"EmitsChangedSignal": "false"})

1233

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

1234

access="r")

1235

def Property_dbus_property(self):

1236

return dbus.Boolean(False)

1237

1238

See also the DBusObjectWithAnnotations class.

1239

"""

1240

1241

def decorator(func):

1242

func._dbus_annotations = annotations

1243

return func

1244

1245

return decorator

1246

1247

1248

class DBusPropertyException(dbus.exceptions.DBusException):

1249

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

1250

"""

1251

pass

1252

1253

1254

class DBusPropertyAccessException(DBusPropertyException):

1255

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

1256

"""

1257

pass

1258

1259

1260

class DBusPropertyNotFound(DBusPropertyException):

1261

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

1262

"""

1263

pass

1264

1265

1266

class DBusObjectWithAnnotations(dbus.service.Object):

1267

"""A D-Bus object with annotations.

1268

1269

Classes inheriting from this can use the dbus_annotations

1270

decorator to add annotations to methods or signals.

1271

"""

1272

1273

@staticmethod

1274

def _is_dbus_thing(thing):

1275

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

1276

1277

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

1278

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

1279

"""

1280

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

1281

False)

1282

1283

def _get_all_dbus_things(self, thing):

1284

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

1285

"""

1286

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

1287

athing.__get__(self))

1288

for cls in self.__class__.__mro__

1289

for name, athing in

1290

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

1291

1292

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1293

out_signature="s",

1294

path_keyword='object_path',

1295

connection_keyword='connection')

1296

def Introspect(self, object_path, connection):

1297

"""Overloading of standard D-Bus method.

1298

1299

Inserts annotation tags on methods and signals.

1300

"""

1301

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

1302

connection)

1303

try:

1304

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

1305

1306

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

1307

# Add annotation tags

1308

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

1309

for tag in if_tag.getElementsByTagName(typ):

1310

annots = dict()

1311

for name, prop in (self.

1312

_get_all_dbus_things(typ)):

1313

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

1314

and prop._dbus_interface

1315

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

1316

annots.update(getattr(

1317

prop, "_dbus_annotations", {}))

1318

for name, value in annots.items():

1319

ann_tag = document.createElement(

1320

"annotation")

1321

ann_tag.setAttribute("name", name)

1322

ann_tag.setAttribute("value", value)

1323

tag.appendChild(ann_tag)

1324

# Add interface annotation tags

1325

for annotation, value in dict(

1326

itertools.chain.from_iterable(

1327

annotations().items()

1328

for name, annotations

1329

in self._get_all_dbus_things("interface")

1330

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

1331

)).items():

1332

ann_tag = document.createElement("annotation")

1333

ann_tag.setAttribute("name", annotation)

1334

ann_tag.setAttribute("value", value)

1335

if_tag.appendChild(ann_tag)

1336

# Fix argument name for the Introspect method itself

1337

if (if_tag.getAttribute("name")

1338

== dbus.INTROSPECTABLE_IFACE):

1339

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

1340

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

1341

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

1342

if (arg.getAttribute("direction")

1343

== "out"):

1344

arg.setAttribute("name",

1345

"xml_data")

1346

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

1347

document.unlink()

1348

except (AttributeError, xml.dom.DOMException,

1349

xml.parsers.expat.ExpatError) as error:

1350

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

1351

exc_info=error)

1352

return xmlstring

1353

1354

1355

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1356

"""A D-Bus object with properties.

1357

1358

Classes inheriting from this can use the dbus_service_property

1359

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

1360

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

1361

"""

1362

1363

def _get_dbus_property(self, interface_name, property_name):

1364

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

1365

property with the specified name and interface.

1366

"""

1367

for cls in self.__class__.__mro__:

1368

for name, value in inspect.getmembers(

1369

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

1370

if (value._dbus_name == property_name

1371

and value._dbus_interface == interface_name):

1372

return value.__get__(self)

1373

1374

# No such property

1375

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

1376

self.dbus_object_path, interface_name, property_name))

1377

1378

@classmethod

1379

def _get_all_interface_names(cls):

1380

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

1381

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

1382

"_dbus_interface", None)

1383

for x in (inspect.getmro(cls))

1384

for attr in dir(x))

1385

if name is not None)

1386

1387

@dbus.service.method(dbus.PROPERTIES_IFACE,

1388

in_signature="ss",

1389

out_signature="v")

1390

def Get(self, interface_name, property_name):

1391

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

1392

"""

1393

prop = self._get_dbus_property(interface_name, property_name)

1394

if prop._dbus_access == "write":

1395

raise DBusPropertyAccessException(property_name)

1396

value = prop()

1397

if not hasattr(value, "variant_level"):

1398

return value

1399

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

1400

1401

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

1402

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

1403

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

1404

"""

1405

prop = self._get_dbus_property(interface_name, property_name)

1406

if prop._dbus_access == "read":

1407

raise DBusPropertyAccessException(property_name)

1408

if prop._dbus_get_args_options["byte_arrays"]:

1409

# The byte_arrays option is not supported yet on

1410

# signatures other than "ay".

1411

if prop._dbus_signature != "ay":

1412

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

1413

"'ay' signature {!r}"

1414

.format(prop._dbus_signature))

1415

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

1416

for byte in value))

1417

prop(value)

1418

1419

@dbus.service.method(dbus.PROPERTIES_IFACE,

1420

in_signature="s",

1421

out_signature="a{sv}")

1422

def GetAll(self, interface_name):

1423

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

1424

standard.

1425

1426

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

1427

"""

1428

properties = {}

1429

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

1430

if (interface_name

1431

and interface_name != prop._dbus_interface):

1432

# Interface non-empty but did not match

1433

continue

1434

# Ignore write-only properties

1435

if prop._dbus_access == "write":

1436

continue

1437

value = prop()

1438

if not hasattr(value, "variant_level"):

1439

properties[name] = value

1440

continue

1441

properties[name] = type(value)(

1442

value, variant_level=value.variant_level + 1)

1443

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

1444

1445

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

1446

def PropertiesChanged(self, interface_name, changed_properties,

1447

invalidated_properties):

1448

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

1449

standard.

1450

"""

1451

pass

1452

1453

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1454

out_signature="s",

1455

path_keyword='object_path',

1456

connection_keyword='connection')

1457

def Introspect(self, object_path, connection):

1458

"""Overloading of standard D-Bus method.

1459

1460

Inserts property tags and interface annotation tags.

1461

"""

1462

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1463

object_path,

1464

connection)

1465

try:

1466

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

1467

1468

def make_tag(document, name, prop):

1469

e = document.createElement("property")

1470

e.setAttribute("name", name)

1471

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

1472

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

1473

return e

1474

1475

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

1476

# Add property tags

1477

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

1478

for name, prop

1479

in self._get_all_dbus_things("property")

1480

if prop._dbus_interface

1481

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

1482

if_tag.appendChild(tag)

1483

# Add annotation tags for properties

1484

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

1485

annots = dict()

1486

for name, prop in self._get_all_dbus_things(

1487

"property"):

1488

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

1489

and prop._dbus_interface

1490

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

1491

annots.update(getattr(

1492

prop, "_dbus_annotations", {}))

1493

for name, value in annots.items():

1494

ann_tag = document.createElement(

1495

"annotation")

1496

ann_tag.setAttribute("name", name)

1497

ann_tag.setAttribute("value", value)

1498

tag.appendChild(ann_tag)

1499

# Add the names to the return values for the

1500

# "org.freedesktop.DBus.Properties" methods

1501

if (if_tag.getAttribute("name")

1502

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

1503

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

1504

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

1505

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

1506

if (arg.getAttribute("direction")

1507

== "out"):

1508

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

1509

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

1510

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

1511

if (arg.getAttribute("direction")

1512

== "out"):

1513

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

1514

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

1515

document.unlink()

1516

except (AttributeError, xml.dom.DOMException,

1517

xml.parsers.expat.ExpatError) as error:

1518

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

1519

exc_info=error)

1520

return xmlstring

1521

1522

1523

try:

1524

dbus.OBJECT_MANAGER_IFACE

1525

except AttributeError:

1526

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

1527

1528

1529

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1530

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

1531

1532

Classes inheriting from this exposes the standard

1533

GetManagedObjects call and the InterfacesAdded and

1534

InterfacesRemoved signals on the standard

1535

"org.freedesktop.DBus.ObjectManager" interface.

1536

1537

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

1538

manually.

1539

"""

1540

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1541

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

1542

def GetManagedObjects(self):

1543

"""This function must be overridden"""

1544

raise NotImplementedError()

1545

1546

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1547

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

1548

def InterfacesAdded(self, object_path, interfaces_and_properties):

1549

pass

1550

1551

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

1552

def InterfacesRemoved(self, object_path, interfaces):

1553

pass

1554

1555

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1556

out_signature="s",

1557

path_keyword='object_path',

1558

connection_keyword='connection')

1559

def Introspect(self, object_path, connection):

1560

"""Overloading of standard D-Bus method.

1561

1562

Override return argument name of GetManagedObjects to be

1563

"objpath_interfaces_and_properties"

1564

"""

1565

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1566

object_path,

1567

connection)

1568

try:

1569

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

1570

1571

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

1572

# Fix argument name for the GetManagedObjects method

1573

if (if_tag.getAttribute("name")

1574

== dbus.OBJECT_MANAGER_IFACE):

1575

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

1576

if (cn.getAttribute("name")

1577

== "GetManagedObjects"):

1578

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

1579

if (arg.getAttribute("direction")

1580

== "out"):

1581

arg.setAttribute(

1582

"name",

1583

"objpath_interfaces"

1584

"_and_properties")

1585

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

1586

document.unlink()

1587

except (AttributeError, xml.dom.DOMException,

1588

xml.parsers.expat.ExpatError) as error:

1589

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

1590

exc_info=error)

1591

return xmlstring

1592

1593

1594

def datetime_to_dbus(dt, variant_level=0):

1595

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

1596

if dt is None:

1597

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

1598

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

1599

1600

1601

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1602

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

1603

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

1604

interface names according to the "alt_interface_names" mapping.

1605

Usage:

1606

1607

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

1608

"net.example.AlternateInterface"})

1609

class SampleDBusObject(dbus.service.Object):

1610

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

1611

def SampleDBusMethod():

1612

pass

1613

1614

The above "SampleDBusMethod" on "SampleDBusObject" will be

1615

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

1616

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

1617

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

1618

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

1619

1620

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

1621

(from DBusObjectWithProperties) and interfaces (from the

1622

dbus_interface_annotations decorator).

1623

"""

1624

1625

def wrapper(cls):

1626

for orig_interface_name, alt_interface_name in (

1627

alt_interface_names.items()):

1628

attr = {}

1629

interface_names = set()

1630

# Go though all attributes of the class

1631

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

1632

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

1633

# with the wrong interface name

1634

if (not hasattr(attribute, "_dbus_interface")

1635

or not attribute._dbus_interface.startswith(

1636

orig_interface_name)):

1637

continue

1638

# Create an alternate D-Bus interface name based on

1639

# the current name

1640

alt_interface = attribute._dbus_interface.replace(

1641

orig_interface_name, alt_interface_name)

1642

interface_names.add(alt_interface)

1643

# Is this a D-Bus signal?

1644

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

1645

# Extract the original non-method undecorated

1646

# function by black magic

1647

if sys.version_info.major == 2:

1648

nonmethod_func = (dict(

1649

zip(attribute.func_code.co_freevars,

1650

attribute.__closure__))

1651

["func"].cell_contents)

1652

else:

1653

nonmethod_func = (dict(

1654

zip(attribute.__code__.co_freevars,

1655

attribute.__closure__))

1656

["func"].cell_contents)

1657

# Create a new, but exactly alike, function

1658

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

1659

# with the alternate D-Bus interface name

1660

new_function = copy_function(nonmethod_func)

1661

new_function = (dbus.service.signal(

1662

alt_interface,

1663

attribute._dbus_signature)(new_function))

1664

# Copy annotations, if any

1665

try:

1666

new_function._dbus_annotations = dict(

1667

attribute._dbus_annotations)

1668

except AttributeError:

1669

pass

1670

1671

# Define a creator of a function to call both the

1672

# original and alternate functions, so both the

1673

# original and alternate signals gets sent when

1674

# the function is called

1675

def fixscope(func1, func2):

1676

"""This function is a scope container to pass

1677

func1 and func2 to the "call_both" function

1678

outside of its arguments"""

1679

1680

@functools.wraps(func2)

1681

def call_both(*args, **kwargs):

1682

"""This function will emit two D-Bus

1683

signals by calling func1 and func2"""

1684

func1(*args, **kwargs)

1685

func2(*args, **kwargs)

1686

# Make wrapper function look like a D-Bus

1687

# signal

1688

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

1689

if name.startswith("_dbus_"):

1690

setattr(call_both, name, attr)

1691

1692

return call_both

1693

# Create the "call_both" function and add it to

1694

# the class

1695

attr[attrname] = fixscope(attribute, new_function)

1696

# Is this a D-Bus method?

1697

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

1698

# Create a new, but exactly alike, function

1699

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

1700

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

1701

# to the class.

1702

attr[attrname] = (

1703

dbus.service.method(

1704

alt_interface,

1705

attribute._dbus_in_signature,

1706

attribute._dbus_out_signature)

1707

(copy_function(attribute)))

1708

# Copy annotations, if any

1709

try:

1710

attr[attrname]._dbus_annotations = dict(

1711

attribute._dbus_annotations)

1712

except AttributeError:

1713

pass

1714

# Is this a D-Bus property?

1715

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

1716

# Create a new, but exactly alike, function

1717

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

1718

# property with the alternate D-Bus interface

1719

# name. Add it to the class.

1720

attr[attrname] = (dbus_service_property(

1721

alt_interface, attribute._dbus_signature,

1722

attribute._dbus_access,

1723

attribute._dbus_get_args_options

1724

["byte_arrays"])

1725

(copy_function(attribute)))

1726

# Copy annotations, if any

1727

try:

1728

attr[attrname]._dbus_annotations = dict(

1729

attribute._dbus_annotations)

1730

except AttributeError:

1731

pass

1732

# Is this a D-Bus interface?

1733

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

1734

# Create a new, but exactly alike, function

1735

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

1736

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

1737

# to the class.

1738

attr[attrname] = (

1739

dbus_interface_annotations(alt_interface)

1740

(copy_function(attribute)))

1741

if deprecate:

1742

# Deprecate all alternate interfaces

1743

iname = "_AlternateDBusNames_interface_annotation{}"

1744

for interface_name in interface_names:

1745

1746

@dbus_interface_annotations(interface_name)

1747

def func(self):

1748

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

1749

"true"}

1750

# Find an unused name

1751

for aname in (iname.format(i)

1752

for i in itertools.count()):

1753

if aname not in attr:

1754

attr[aname] = func

1755

break

1756

if interface_names:

1757

# Replace the class with a new subclass of it with

1758

# methods, signals, etc. as created above.

1759

if sys.version_info.major == 2:

1760

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

1761

(cls, ), attr)

1762

else:

1763

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

1764

(cls, ), attr)

1765

return cls

1766

1767

return wrapper

1768

1769

1770

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

1771

"se.bsnet.fukt.Mandos"})

1772

class ClientDBus(Client, DBusObjectWithProperties):

1773

"""A Client class using D-Bus

1774

1775

Attributes:

1776

dbus_object_path: dbus.ObjectPath

1777

bus: dbus.SystemBus()

1778

"""

1779

1780

runtime_expansions = (Client.runtime_expansions

1781

+ ("dbus_object_path", ))

1782

1783

_interface = "se.recompile.Mandos.Client"

1784

1785

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

1786

1787

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

1788

self.bus = bus

1789

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

1790

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

1791

# the D-Bus

1792

client_object_name = str(self.name).translate(

1793

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

1794

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

1795

self.dbus_object_path = dbus.ObjectPath(

1796

"/clients/" + client_object_name)

1797

DBusObjectWithProperties.__init__(self, self.bus,

1798

self.dbus_object_path)

1799

1800

def notifychangeproperty(transform_func, dbus_name,

1801

type_func=lambda x: x,

1802

variant_level=1,

1803

invalidate_only=False,

1804

_interface=_interface):

1805

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

1806

its changes to DBus.

1807

1808

transform_fun: Function that takes a value and a variant_level

1809

and transforms it to a D-Bus type.

1810

dbus_name: D-Bus name of the variable

1811

type_func: Function that transform the value before sending it

1812

to the D-Bus. Default: no transform

1813

variant_level: D-Bus variant level. Default: 1

1814

"""

1815

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

1816

1817

def setter(self, value):

1818

if hasattr(self, "dbus_object_path"):

1819

if (not hasattr(self, attrname) or

1820

type_func(getattr(self, attrname, None))

1821

!= type_func(value)):

1822

if invalidate_only:

1823

self.PropertiesChanged(

1824

_interface, dbus.Dictionary(),

1825

dbus.Array((dbus_name, )))

1826

else:

1827

dbus_value = transform_func(

1828

type_func(value),

1829

variant_level=variant_level)

1830

self.PropertyChanged(dbus.String(dbus_name),

1831

dbus_value)

1832

self.PropertiesChanged(

1833

_interface,

1834

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

1835

dbus_value}),

1836

dbus.Array())

1837

setattr(self, attrname, value)

1838

1839

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

1840

1841

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1842

approvals_pending = notifychangeproperty(dbus.Boolean,

1843

"ApprovalPending",

1844

type_func=bool)

1845

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

1846

last_enabled = notifychangeproperty(datetime_to_dbus,

1847

"LastEnabled")

1848

checker = notifychangeproperty(

1849

dbus.Boolean, "CheckerRunning",

1850

type_func=lambda checker: checker is not None)

1851

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1852

"LastCheckedOK")

1853

last_checker_status = notifychangeproperty(dbus.Int16,

1854

"LastCheckerStatus")

1855

last_approval_request = notifychangeproperty(

1856

datetime_to_dbus, "LastApprovalRequest")

1857

approved_by_default = notifychangeproperty(dbus.Boolean,

1858

"ApprovedByDefault")

1859

approval_delay = notifychangeproperty(

1860

dbus.UInt64, "ApprovalDelay",

1861

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

1862

approval_duration = notifychangeproperty(

1863

dbus.UInt64, "ApprovalDuration",

1864

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

1865

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

1866

timeout = notifychangeproperty(

1867

dbus.UInt64, "Timeout",

1868

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

1869

extended_timeout = notifychangeproperty(

1870

dbus.UInt64, "ExtendedTimeout",

1871

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

1872

interval = notifychangeproperty(

1873

dbus.UInt64, "Interval",

1874

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

1875

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

1876

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

1877

invalidate_only=True)

1878

1879

del notifychangeproperty

1880

1881

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

1882

try:

1883

self.remove_from_connection()

1884

except LookupError:

1885

pass

1886

if hasattr(DBusObjectWithProperties, "__del__"):

1887

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

1888

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

1889

1890

def checker_callback(self, source, condition,

1891

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

1892

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

1893

connection, command, *args,

1894

**kwargs)

1895

exitstatus = self.last_checker_status

1896

if exitstatus >= 0:

1897

# Emit D-Bus signal

1898

self.CheckerCompleted(dbus.Int16(exitstatus),

1899

# This is specific to GNU libC

1900

dbus.Int64(exitstatus << 8),

1901

dbus.String(command))

1902

else:

1903

# Emit D-Bus signal

1904

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

1905

dbus.Int64(

1906

# This is specific to GNU libC

1907

(exitstatus << 8)

1908

| self.last_checker_signal),

1909

dbus.String(command))

1910

return ret

1911

1912

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

1913

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

1914

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

1915

# Only if new checker process was started

1916

if (self.checker is not None

1917

and old_checker_pid != self.checker.pid):

1918

# Emit D-Bus signal

1919

self.CheckerStarted(self.current_checker_command)

1920

return r

1921

1922

def _reset_approved(self):

1923

self.approved = None

1924

return False

1925

1926

def approve(self, value=True):

1927

self.approved = value

1928

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

1929

* 1000), self._reset_approved)

1930

self.send_changedstate()

1931

1932

# D-Bus methods, signals & properties

1933

1934

# Interfaces

1935

1936

# Signals

1937

1938

# CheckerCompleted - signal

1939

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

1940

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

1941

"D-Bus signal"

1942

pass

1943

1944

# CheckerStarted - signal

1945

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

1946

def CheckerStarted(self, command):

1947

"D-Bus signal"

1948

pass

1949

1950

# PropertyChanged - signal

1951

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

1952

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

1953

def PropertyChanged(self, property, value):

1954

"D-Bus signal"

1955

pass

1956

1957

# GotSecret - signal

1958

@dbus.service.signal(_interface)

1959

def GotSecret(self):

1960

"""D-Bus signal

1961

Is sent after a successful transfer of secret from the Mandos

1962

server to mandos-client

1963

"""

1964

pass

1965

1966

# Rejected - signal

1967

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

1968

def Rejected(self, reason):

1969

"D-Bus signal"

1970

pass

1971

1972

# NeedApproval - signal

1973

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

1974

def NeedApproval(self, timeout, default):

1975

"D-Bus signal"

1976

return self.need_approval()

1977

1978

# Methods

1979

1980

# Approve - method

1981

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

1982

def Approve(self, value):

1983

self.approve(value)

1984

1985

# CheckedOK - method

1986

@dbus.service.method(_interface)

1987

def CheckedOK(self):

1988

self.checked_ok()

1989

1990

# Enable - method

1991

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

1992

@dbus.service.method(_interface)

1993

def Enable(self):

1994

"D-Bus method"

1995

self.enable()

1996

1997

# StartChecker - method

1998

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

1999

@dbus.service.method(_interface)

2000

def StartChecker(self):

2001

"D-Bus method"

2002

self.start_checker()

2003

2004

# Disable - method

2005

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

2006

@dbus.service.method(_interface)

2007

def Disable(self):

2008

"D-Bus method"

2009

self.disable()

2010

2011

# StopChecker - method

2012

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

2013

@dbus.service.method(_interface)

2014

def StopChecker(self):

2015

self.stop_checker()

2016

2017

# Properties

2018

2019

# ApprovalPending - property

2020

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

2021

def ApprovalPending_dbus_property(self):

2022

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

2023

2024

# ApprovedByDefault - property

2025

@dbus_service_property(_interface,

2026

signature="b",

2027

access="readwrite")

2028

def ApprovedByDefault_dbus_property(self, value=None):

2029

if value is None: # get

2030

return dbus.Boolean(self.approved_by_default)

2031

self.approved_by_default = bool(value)

2032

2033

# ApprovalDelay - property

2034

@dbus_service_property(_interface,

2035

signature="t",

2036

access="readwrite")

2037

def ApprovalDelay_dbus_property(self, value=None):

2038

if value is None: # get

2039

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

2040

* 1000)

2041

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

2042

2043

# ApprovalDuration - property

2044

@dbus_service_property(_interface,

2045

signature="t",

2046

access="readwrite")

2047

def ApprovalDuration_dbus_property(self, value=None):

2048

if value is None: # get

2049

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

2050

* 1000)

2051

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

2052

2053

# Name - property

2054

@dbus_annotations(

2055

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

2056

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

2057

def Name_dbus_property(self):

2058

return dbus.String(self.name)

2059

2060

# KeyID - property

2061

@dbus_annotations(

2062

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

2063

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

2064

def KeyID_dbus_property(self):

2065

return dbus.String(self.key_id)

2066

2067

# Fingerprint - property

2068

@dbus_annotations(

2069

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

2070

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

2071

def Fingerprint_dbus_property(self):

2072

return dbus.String(self.fingerprint)

2073

2074

# Host - property

2075

@dbus_service_property(_interface,

2076

signature="s",

2077

access="readwrite")

2078

def Host_dbus_property(self, value=None):

2079

if value is None: # get

2080

return dbus.String(self.host)

2081

self.host = str(value)

2082

2083

# Created - property

2084

@dbus_annotations(

2085

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

2086

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

2087

def Created_dbus_property(self):

2088

return datetime_to_dbus(self.created)

2089

2090

# LastEnabled - property

2091

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

2092

def LastEnabled_dbus_property(self):

2093

return datetime_to_dbus(self.last_enabled)

2094

2095

# Enabled - property

2096

@dbus_service_property(_interface,

2097

signature="b",

2098

access="readwrite")

2099

def Enabled_dbus_property(self, value=None):

2100

if value is None: # get

2101

return dbus.Boolean(self.enabled)

2102

if value:

2103

self.enable()

2104

else:

2105

self.disable()

2106

2107

# LastCheckedOK - property

2108

@dbus_service_property(_interface,

2109

signature="s",

2110

access="readwrite")

2111

def LastCheckedOK_dbus_property(self, value=None):

2112

if value is not None:

2113

self.checked_ok()

2114

return

2115

return datetime_to_dbus(self.last_checked_ok)

2116

2117

# LastCheckerStatus - property

2118

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

2119

def LastCheckerStatus_dbus_property(self):

2120

return dbus.Int16(self.last_checker_status)

2121

2122

# Expires - property

2123

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

2124

def Expires_dbus_property(self):

2125

return datetime_to_dbus(self.expires)

2126

2127

# LastApprovalRequest - property

2128

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

2129

def LastApprovalRequest_dbus_property(self):

2130

return datetime_to_dbus(self.last_approval_request)

2131

2132

# Timeout - property

2133

@dbus_service_property(_interface,

2134

signature="t",

2135

access="readwrite")

2136

def Timeout_dbus_property(self, value=None):

2137

if value is None: # get

2138

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

2139

old_timeout = self.timeout

2140

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

2141

# Reschedule disabling

2142

if self.enabled:

2143

now = datetime.datetime.utcnow()

2144

self.expires += self.timeout - old_timeout

2145

if self.expires <= now:

2146

# The timeout has passed

2147

self.disable()

2148

else:

2149

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

2150

is None):

2151

return

2152

GLib.source_remove(self.disable_initiator_tag)

2153

self.disable_initiator_tag = GLib.timeout_add(

2154

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

2155

self.disable)

2156

2157

# ExtendedTimeout - property

2158

@dbus_service_property(_interface,

2159

signature="t",

2160

access="readwrite")

2161

def ExtendedTimeout_dbus_property(self, value=None):

2162

if value is None: # get

2163

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

2164

* 1000)

2165

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

2166

2167

# Interval - property

2168

@dbus_service_property(_interface,

2169

signature="t",

2170

access="readwrite")

2171

def Interval_dbus_property(self, value=None):

2172

if value is None: # get

2173

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

2174

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

2175

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

2176

return

2177

if self.enabled:

2178

# Reschedule checker run

2179

GLib.source_remove(self.checker_initiator_tag)

2180

self.checker_initiator_tag = GLib.timeout_add(

2181

value, self.start_checker)

2182

self.start_checker() # Start one now, too

2183

2184

# Checker - property

2185

@dbus_service_property(_interface,

2186

signature="s",

2187

access="readwrite")

2188

def Checker_dbus_property(self, value=None):

2189

if value is None: # get

2190

return dbus.String(self.checker_command)

2191

self.checker_command = str(value)

2192

2193

# CheckerRunning - property

2194

@dbus_service_property(_interface,

2195

signature="b",

2196

access="readwrite")

2197

def CheckerRunning_dbus_property(self, value=None):

2198

if value is None: # get

2199

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

2200

if value:

2201

self.start_checker()

2202

else:

2203

self.stop_checker()

2204

2205

# ObjectPath - property

2206

@dbus_annotations(

2207

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

2208

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

2209

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

2210

def ObjectPath_dbus_property(self):

2211

return self.dbus_object_path # is already a dbus.ObjectPath

2212

2213

# Secret = property

2214

@dbus_annotations(

2215

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

2216

"invalidates"})

2217

@dbus_service_property(_interface,

2218

signature="ay",

2219

access="write",

2220

byte_arrays=True)

2221

def Secret_dbus_property(self, value):

2222

self.secret = bytes(value)

2223

2224

del _interface

2225

2226

2227

class ProxyClient:

2228

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

2229

self._pipe = child_pipe

2230

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

2231

if not self._pipe.recv():

2232

raise KeyError(key_id or fpr)

2233

2234

def __getattribute__(self, name):

2235

if name == '_pipe':

2236

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

2237

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

2238

data = self._pipe.recv()

2239

if data[0] == 'data':

2240

return data[1]

2241

if data[0] == 'function':

2242

2243

def func(*args, **kwargs):

2244

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

2245

return self._pipe.recv()[1]

2246

2247

return func

2248

2249

def __setattr__(self, name, value):

2250

if name == '_pipe':

2251

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

2252

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

2253

2254

2255

class ClientHandler(socketserver.BaseRequestHandler, object):

2256

"""A class to handle client connections.

2257

2258

Instantiated once for each connection to handle it.

248

def still_valid(self, now=None):

249

"""Has the timeout not yet passed for this client?"""

250

if now is None:

251

now = datetime.datetime.now()

252

if self.last_seen is None:

253

return now < (self.created + self.timeout)

254

else:

255

return now < (self.last_seen + self.timeout)

256

257

258

def peer_certificate(session):

259

# If not an OpenPGP certificate...

260

if gnutls.library.functions.gnutls_certificate_type_get\

261

(session._c_object) \

262

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:

263

# ...do the normal thing

264

return session.peer_certificate

265

list_size = ctypes.c_uint()

266

cert_list = gnutls.library.functions.gnutls_certificate_get_peers\

267

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

268

if list_size.value == 0:

269

return None

270

cert = cert_list[0]

271

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

272

273

274

def fingerprint(openpgp):

275

# New empty GnuTLS certificate

276

crt = gnutls.library.types.gnutls_openpgp_crt_t()

277

gnutls.library.functions.gnutls_openpgp_crt_init\

278

(ctypes.byref(crt))

279

# New GnuTLS "datum" with the OpenPGP public key

280

datum = gnutls.library.types.gnutls_datum_t\

281

(ctypes.cast(ctypes.c_char_p(openpgp),

282

ctypes.POINTER(ctypes.c_ubyte)),

283

ctypes.c_uint(len(openpgp)))

284

# Import the OpenPGP public key into the certificate

285

ret = gnutls.library.functions.gnutls_openpgp_crt_import\

286

(crt,

287

ctypes.byref(datum),

288

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

289

# New buffer for the fingerprint

290

buffer = ctypes.create_string_buffer(20)

291

buffer_length = ctypes.c_size_t()

292

# Get the fingerprint from the certificate into the buffer

293

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\

294

(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))

295

# Deinit the certificate

296

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

297

# Convert the buffer to a Python bytestring

298

fpr = ctypes.string_at(buffer, buffer_length.value)

299

# Convert the bytestring to hexadecimal notation

300

hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)

301

return hex_fpr

302

303

304

class tcp_handler(SocketServer.BaseRequestHandler, object):

305

"""A TCP request handler class.

306

Instantiated by IPv6_TCPServer for each request to handle it.

2259

307

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

2260

308

2261

309

def handle(self):

2262

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

2263

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

2264

str(self.client_address))

2265

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

2266

self.server.child_pipe.fileno())

2267

2268

session = gnutls.ClientSession(self.request)

2269

2270

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

2271

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

2272

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

2273

# "+DHE-DSS"))

2274

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

2275

priority = self.server.gnutls_priority

2276

if priority is None:

2277

priority = "NORMAL"

2278

gnutls.priority_set_direct(session._c_object,

2279

priority.encode("utf-8"),

2280

None)

2281

2282

# Start communication using the Mandos protocol

2283

# Get protocol number

2284

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

2285

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

2286

try:

2287

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

2288

raise RuntimeError(line)

2289

except (ValueError, IndexError, RuntimeError) as error:

2290

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

2291

return

2292

2293

# Start GnuTLS connection

2294

try:

2295

session.handshake()

2296

except gnutls.Error as error:

2297

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

2298

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

2299

# established. Just abandon the request.

2300

return

2301

logger.debug("Handshake succeeded")

2302

2303

approval_required = False

2304

try:

2305

if gnutls.has_rawpk:

2306

fpr = b""

2307

try:

2308

key_id = self.key_id(

2309

self.peer_certificate(session))

2310

except (TypeError, gnutls.Error) as error:

2311

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

2312

return

2313

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

2314

2315

else:

2316

key_id = b""

2317

try:

2318

fpr = self.fingerprint(

2319

self.peer_certificate(session))

2320

except (TypeError, gnutls.Error) as error:

2321

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

2322

return

2323

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

2324

2325

try:

2326

client = ProxyClient(child_pipe, key_id, fpr,

2327

self.client_address)

2328

except KeyError:

2329

return

2330

2331

if client.approval_delay:

2332

delay = client.approval_delay

2333

client.approvals_pending += 1

2334

approval_required = True

2335

2336

while True:

2337

if not client.enabled:

2338

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

2339

client.name)

2340

if self.server.use_dbus:

2341

# Emit D-Bus signal

2342

client.Rejected("Disabled")

2343

return

2344

2345

if client.approved or not client.approval_delay:

2346

# We are approved or approval is disabled

2347

break

2348

elif client.approved is None:

2349

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

2350

client.name)

2351

if self.server.use_dbus:

2352

# Emit D-Bus signal

2353

client.NeedApproval(

2354

client.approval_delay.total_seconds()

2355

* 1000, client.approved_by_default)

2356

else:

2357

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

2358

client.name)

2359

if self.server.use_dbus:

2360

# Emit D-Bus signal

2361

client.Rejected("Denied")

2362

return

2363

2364

# wait until timeout or approved

2365

time = datetime.datetime.now()

2366

client.changedstate.acquire()

2367

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

2368

client.changedstate.release()

2369

time2 = datetime.datetime.now()

2370

if (time2 - time) >= delay:

2371

if not client.approved_by_default:

2372

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

2373

" waiting for approval",

2374

client.name)

2375

if self.server.use_dbus:

2376

# Emit D-Bus signal

2377

client.Rejected("Approval timed out")

2378

return

2379

else:

2380

break

2381

else:

2382

delay -= time2 - time

2383

2384

try:

2385

session.send(client.secret)

2386

except gnutls.Error as error:

2387

logger.warning("gnutls send failed",

2388

exc_info=error)

2389

return

2390

2391

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

2392

# bump the timeout using extended_timeout

2393

client.bump_timeout(client.extended_timeout)

2394

if self.server.use_dbus:

2395

# Emit D-Bus signal

2396

client.GotSecret()

2397

2398

finally:

2399

if approval_required:

2400

client.approvals_pending -= 1

2401

try:

2402

session.bye()

2403

except gnutls.Error as error:

2404

logger.warning("GnuTLS bye failed",

2405

exc_info=error)

2406

2407

@staticmethod

2408

def peer_certificate(session):

2409

"Return the peer's certificate as a bytestring"

2410

try:

2411

cert_type = gnutls.certificate_type_get2(session._c_object,

2412

gnutls.CTYPE_PEERS)

2413

except AttributeError:

2414

cert_type = gnutls.certificate_type_get(session._c_object)

2415

if gnutls.has_rawpk:

2416

valid_cert_types = frozenset((gnutls.CRT_RAWPK,))

2417

else:

2418

valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))

2419

# If not a valid certificate type...

2420

if cert_type not in valid_cert_types:

2421

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

2422

valid_cert_types)

2423

# ...return invalid data

2424

return b""

2425

list_size = ctypes.c_uint(1)

2426

cert_list = (gnutls.certificate_get_peers

2427

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

2428

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

2429

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

2430

if list_size.value == 0:

2431

return None

2432

cert = cert_list[0]

2433

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

2434

2435

@staticmethod

2436

def key_id(certificate):

2437

"Convert a certificate bytestring to a hexdigit key ID"

2438

# New GnuTLS "datum" with the public key

2439

datum = gnutls.datum_t(

2440

ctypes.cast(ctypes.c_char_p(certificate),

2441

ctypes.POINTER(ctypes.c_ubyte)),

2442

ctypes.c_uint(len(certificate)))

2443

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

2444

# New empty GnuTLS certificate

2445

pubkey = gnutls.pubkey_t()

2446

gnutls.pubkey_init(ctypes.byref(pubkey))

2447

# Import the raw public key into the certificate

2448

gnutls.pubkey_import(pubkey,

2449

ctypes.byref(datum),

2450

gnutls.X509_FMT_DER)

2451

# New buffer for the key ID

2452

buf = ctypes.create_string_buffer(32)

2453

buf_len = ctypes.c_size_t(len(buf))

2454

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

2455

gnutls.pubkey_get_key_id(pubkey,

2456

gnutls.KEYID_USE_SHA256,

2457

ctypes.cast(ctypes.byref(buf),

2458

ctypes.POINTER(ctypes.c_ubyte)),

2459

ctypes.byref(buf_len))

2460

# Deinit the certificate

2461

gnutls.pubkey_deinit(pubkey)

2462

2463

# Convert the buffer to a Python bytestring

2464

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

2465

# Convert the bytestring to hexadecimal notation

2466

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

2467

return hex_key_id

2468

2469

@staticmethod

2470

def fingerprint(openpgp):

2471

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2472

# New GnuTLS "datum" with the OpenPGP public key

2473

datum = gnutls.datum_t(

2474

ctypes.cast(ctypes.c_char_p(openpgp),

2475

ctypes.POINTER(ctypes.c_ubyte)),

2476

ctypes.c_uint(len(openpgp)))

2477

# New empty GnuTLS certificate

2478

crt = gnutls.openpgp_crt_t()

2479

gnutls.openpgp_crt_init(ctypes.byref(crt))

2480

# Import the OpenPGP public key into the certificate

2481

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

2482

gnutls.OPENPGP_FMT_RAW)

2483

# Verify the self signature in the key

2484

crtverify = ctypes.c_uint()

2485

gnutls.openpgp_crt_verify_self(crt, 0,

2486

ctypes.byref(crtverify))

2487

if crtverify.value != 0:

2488

gnutls.openpgp_crt_deinit(crt)

2489

raise gnutls.CertificateSecurityError(code

2490

=crtverify.value)

2491

# New buffer for the fingerprint

2492

buf = ctypes.create_string_buffer(20)

2493

buf_len = ctypes.c_size_t()

2494

# Get the fingerprint from the certificate into the buffer

2495

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

2496

ctypes.byref(buf_len))

2497

# Deinit the certificate

2498

gnutls.openpgp_crt_deinit(crt)

2499

# Convert the buffer to a Python bytestring

2500

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

2501

# Convert the bytestring to hexadecimal notation

2502

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

2503

return hex_fpr

2504

2505

2506

class MultiprocessingMixIn:

2507

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

2508

2509

def sub_process_main(self, request, address):

2510

try:

2511

self.finish_request(request, address)

2512

except Exception:

2513

self.handle_error(request, address)

2514

self.close_request(request)

2515

2516

def process_request(self, request, address):

2517

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

2518

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

2519

args=(request, address))

2520

proc.start()

2521

return proc

2522

2523

2524

class MultiprocessingMixInWithPipe(MultiprocessingMixIn):

2525

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

2526

2527

def process_request(self, request, client_address):

2528

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

2529

2530

This function creates a new pipe in self.pipe

2531

"""

2532

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2533

2534

proc = MultiprocessingMixIn.process_request(self, request,

2535

client_address)

2536

self.child_pipe.close()

2537

self.add_pipe(parent_pipe, proc)

2538

2539

def add_pipe(self, parent_pipe, proc):

2540

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

2541

raise NotImplementedError()

2542

2543

2544

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2545

socketserver.TCPServer):

2546

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

2547

310

logger.debug(u"TCP connection from: %s",

311

unicode(self.client_address))

312

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

313

gnutls.connection.\

314

X509Credentials())

315

316

#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",

317

# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",

318

# "+DHE-DSS"))

319

priority = "SECURE256"

320

321

gnutls.library.functions.gnutls_priority_set_direct\

322

(session._c_object, priority, None);

323

324

try:

325

session.handshake()

326

except gnutls.errors.GNUTLSError, error:

327

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

328

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

329

# established. Just abandon the request.

330

return

331

try:

332

fpr = fingerprint(peer_certificate(session))

333

except (TypeError, gnutls.errors.GNUTLSError), error:

334

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

335

session.bye()

336

return

337

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

338

client = None

339

for c in clients:

340

if c.fingerprint == fpr:

341

client = c

342

break

343

# Have to check if client.still_valid(), since it is possible

344

# that the client timed out while establishing the GnuTLS

345

# session.

346

if (not client) or (not client.still_valid()):

347

if client:

348

logger.debug(u"Client %(name)s is invalid",

349

vars(client))

350

else:

351

logger.debug(u"Client not found for fingerprint: %s",

352

fpr)

353

session.bye()

354

return

355

sent_size = 0

356

while sent_size < len(client.secret):

357

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

358

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

359

sent, len(client.secret)

360

- (sent_size + sent))

361

sent_size += sent

362

session.bye()

363

364

365

class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):

366

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

2548

367

Attributes:

2549

enabled: Boolean; whether this server is activated yet

2550

interface: None or a network interface name (string)

2551

use_ipv6: Boolean; to use IPv6 or not

368

options: Command line options

369

clients: Set() of Client objects

2552

370

"""

2553

2554

def __init__(self, server_address, RequestHandlerClass,

2555

interface=None,

2556

use_ipv6=True,

2557

socketfd=None):

2558

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

2559

creating a new one with socket.socket().

2560

"""

2561

self.interface = interface

2562

if use_ipv6:

2563

self.address_family = socket.AF_INET6

2564

if socketfd is not None:

2565

# Save the file descriptor

2566

self.socketfd = socketfd

2567

# Save the original socket.socket() function

2568

self.socket_socket = socket.socket

2569

2570

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

2571

#

2572

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

2573

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

2574

# patching socket.socket.)

2575

#

2576

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

2577

@functools.wraps(socket.socket)

2578

def socket_wrapper(*args, **kwargs):

2579

# Restore original function so subsequent calls are

2580

# not affected.

2581

socket.socket = self.socket_socket

2582

del self.socket_socket

2583

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

2584

# saved file descriptor.

2585

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

2586

# Replace socket.socket() function with wrapper

2587

socket.socket = socket_wrapper

2588

# The socketserver.TCPServer.__init__ will call

2589

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

2590

# socket_wrapper(), if socketfd was set.

2591

socketserver.TCPServer.__init__(self, server_address,

2592

RequestHandlerClass)

2593

371

address_family = socket.AF_INET6

372

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

373

if "options" in kwargs:

374

self.options = kwargs["options"]

375

del kwargs["options"]

376

if "clients" in kwargs:

377

self.clients = kwargs["clients"]

378

del kwargs["clients"]

379

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

2594

380

def server_bind(self):

2595

381

"""This overrides the normal server_bind() function

2596

382

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

2597

383

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

2598

global SO_BINDTODEVICE

2599

if self.interface is not None:

2600

if SO_BINDTODEVICE is None:

2601

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

2602

# common enough.

2603

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

2604

SO_BINDTODEVICE = 25

384

if self.options.interface:

385

if not hasattr(socket, "SO_BINDTODEVICE"):

386

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

387

socket.SO_BINDTODEVICE = 25

2605

388

try:

2606

self.socket.setsockopt(

2607

socket.SOL_SOCKET, SO_BINDTODEVICE,

2608

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

2609

except socket.error as error:

2610

if error.errno == errno.EPERM:

2611

logger.error("No permission to bind to"

2612

" interface %s", self.interface)

2613

elif error.errno == errno.ENOPROTOOPT:

2614

logger.error("SO_BINDTODEVICE not available;"

2615

" cannot bind to interface %s",

2616

self.interface)

2617

elif error.errno == errno.ENODEV:

2618

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

2619

" cannot bind", self.interface)

389

self.socket.setsockopt(socket.SOL_SOCKET,

390

socket.SO_BINDTODEVICE,

391

self.options.interface)

392

except socket.error, error:

393

if error[0] == errno.EPERM:

394

logger.warning(u"No permission to"

395

u" bind to interface %s",

396

self.options.interface)

2620

397

else:

2621

raise

398

raise error

2622

399

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

2623

400

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

2624

if self.server_address[1]:

2625

self.allow_reuse_address = True

2626

401

if not self.server_address[0]:

2627

if self.address_family == socket.AF_INET6:

2628

any_address = "::" # in6addr_any

2629

else:

2630

any_address = "0.0.0.0" # INADDR_ANY

2631

self.server_address = (any_address,

402

in6addr_any = "::"

403

self.server_address = (in6addr_any,

2632

404

self.server_address[1])

2633

elif not self.server_address[1]:

2634

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

2635

# if self.interface:

2636

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

2637

# 0, # port

2638

# 0, # flowinfo

2639

# if_nametoindex

2640

# (self.interface))

2641

return socketserver.TCPServer.server_bind(self)

2642

2643

2644

class MandosServer(IPv6_TCPServer):

2645

"""Mandos server.

2646

2647

Attributes:

2648

clients: set of Client objects

2649

gnutls_priority GnuTLS priority string

2650

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

2651

2652

Assumes a GLib.MainLoop event loop.

2653

"""

2654

2655

def __init__(self, server_address, RequestHandlerClass,

2656

interface=None,

2657

use_ipv6=True,

2658

clients=None,

2659

gnutls_priority=None,

2660

use_dbus=True,

2661

socketfd=None):

2662

self.enabled = False

2663

self.clients = clients

2664

if self.clients is None:

2665

self.clients = {}

2666

self.use_dbus = use_dbus

2667

self.gnutls_priority = gnutls_priority

2668

IPv6_TCPServer.__init__(self, server_address,

2669

RequestHandlerClass,

2670

interface=interface,

2671

use_ipv6=use_ipv6,

2672

socketfd=socketfd)

2673

2674

def server_activate(self):

2675

if self.enabled:

2676

return socketserver.TCPServer.server_activate(self)

2677

2678

def enable(self):

2679

self.enabled = True

2680

2681

def add_pipe(self, parent_pipe, proc):

2682

# Call "handle_ipc" for both data and EOF events

2683

GLib.io_add_watch(

2684

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

2685

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

2686

functools.partial(self.handle_ipc,

2687

parent_pipe=parent_pipe,

2688

proc=proc))

2689

2690

def handle_ipc(self, source, condition,

2691

parent_pipe=None,

2692

proc=None,

2693

client_object=None):

2694

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

2695

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

2696

# Wait for other process to exit

2697

proc.join()

2698

return False

2699

2700

# Read a request from the child

2701

request = parent_pipe.recv()

2702

command = request[0]

2703

2704

if command == 'init':

2705

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

2706

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

2707

address = request[3]

2708

2709

for c in self.clients.values():

2710

if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":

2711

continue

2712

if key_id and c.key_id == key_id:

2713

client = c

2714

break

2715

if fpr and c.fingerprint == fpr:

2716

client = c

2717

break

2718

else:

2719

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

2720

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

2721

if self.use_dbus:

2722

# Emit D-Bus signal

2723

mandos_dbus_service.ClientNotFound(key_id or fpr,

2724

address[0])

2725

parent_pipe.send(False)

2726

return False

2727

2728

GLib.io_add_watch(

2729

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

2730

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

2731

functools.partial(self.handle_ipc,

2732

parent_pipe=parent_pipe,

2733

proc=proc,

2734

client_object=client))

2735

parent_pipe.send(True)

2736

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

2737

# same fileno

2738

return False

2739

if command == 'funcall':

2740

funcname = request[1]

2741

args = request[2]

2742

kwargs = request[3]

2743

2744

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

2745

funcname)(*args,

2746

**kwargs)))

2747

2748

if command == 'getattr':

2749

attrname = request[1]

2750

if isinstance(client_object.__getattribute__(attrname),

2751

collections.Callable):

2752

parent_pipe.send(('function', ))

2753

else:

2754

parent_pipe.send((

2755

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

2756

2757

if command == 'setattr':

2758

attrname = request[1]

2759

value = request[2]

2760

setattr(client_object, attrname, value)

2761

2762

return True

2763

2764

2765

def rfc3339_duration_to_delta(duration):

2766

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

2767

2768

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

2769

True

2770

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

2771

True

2772

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

2773

True

2774

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

2775

True

2776

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

2777

True

2778

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

2779

True

2780

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

2781

True

2782

"""

2783

2784

# Parsing an RFC 3339 duration with regular expressions is not

2785

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

2786

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

2787

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

2788

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

2789

# avoid excessive use of external libraries.

2790

2791

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

2792

Token = collections.namedtuple("Token", (

2793

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

2794

# a "group" containing digits

2795

"value", # datetime.timedelta or None

2796

"followers")) # Tokens valid after this token

2797

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

2798

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

2799

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

2800

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

2801

datetime.timedelta(seconds=1),

2802

frozenset((token_end, )))

2803

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

2804

datetime.timedelta(minutes=1),

2805

frozenset((token_second, token_end)))

2806

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

2807

datetime.timedelta(hours=1),

2808

frozenset((token_minute, token_end)))

2809

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

2810

None,

2811

frozenset((token_hour, token_minute,

2812

token_second)))

2813

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

2814

datetime.timedelta(days=1),

2815

frozenset((token_time, token_end)))

2816

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

2817

datetime.timedelta(weeks=4),

2818

frozenset((token_day, token_end)))

2819

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

2820

datetime.timedelta(weeks=52),

2821

frozenset((token_month, token_end)))

2822

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

2823

datetime.timedelta(weeks=1),

2824

frozenset((token_end, )))

2825

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

2826

frozenset((token_year, token_month,

2827

token_day, token_time,

2828

token_week)))

2829

# Define starting values:

2830

# Value so far

2831

value = datetime.timedelta()

2832

found_token = None

2833

# Following valid tokens

2834

followers = frozenset((token_duration, ))

2835

# String left to parse

2836

s = duration

2837

# Loop until end token is found

2838

while found_token is not token_end:

2839

# Search for any currently valid tokens

2840

for token in followers:

2841

match = token.regexp.match(s)

2842

if match is not None:

2843

# Token found

2844

if token.value is not None:

2845

# Value found, parse digits

2846

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

2847

# Add to value so far

2848

value += factor * token.value

2849

# Strip token from string

2850

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

2851

# Go to found token

2852

found_token = token

2853

# Set valid next tokens

2854

followers = found_token.followers

2855

break

2856

else:

2857

# No currently valid tokens were found

2858

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

2859

.format(duration))

2860

# End token found

2861

return value

405

elif self.server_address[1] is None:

406

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

407

0)

408

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

2862

409

2863

410

2864

411

def string_to_delta(interval):

2865

412

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

2866

413

2867

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

2868

True

2869

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

2870

True

2871

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

2872

True

2873

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

2874

True

2875

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

2876

True

2877

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

2878

True

414

>>> string_to_delta('7d')

415

datetime.timedelta(7)

416

>>> string_to_delta('60s')

417

datetime.timedelta(0, 60)

418

>>> string_to_delta('60m')

419

datetime.timedelta(0, 3600)

420

>>> string_to_delta('24h')

421

datetime.timedelta(1)

422

>>> string_to_delta(u'1w')

423

datetime.timedelta(7)

2879

424

"""

2880

2881

try:

2882

return rfc3339_duration_to_delta(interval)

2883

except ValueError:

2884

pass

2885

2886

timevalue = datetime.timedelta(0)

2887

for s in interval.split():

2888

try:

2889

suffix = s[-1]

2890

value = int(s[:-1])

2891

if suffix == "d":

2892

delta = datetime.timedelta(value)

2893

elif suffix == "s":

2894

delta = datetime.timedelta(0, value)

2895

elif suffix == "m":

2896

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

2897

elif suffix == "h":

2898

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

2899

elif suffix == "w":

2900

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

2901

else:

2902

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

2903

except IndexError as e:

2904

raise ValueError(*(e.args))

2905

timevalue += delta

2906

return timevalue

2907

2908

2909

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

2910

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

2911

2912

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

2913

if os.fork():

2914

sys.exit()

2915

os.setsid()

2916

if not nochdir:

2917

os.chdir("/")

2918

if os.fork():

2919

sys.exit()

2920

if not noclose:

2921

# Close all standard open file descriptors

2922

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

2923

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

2924

raise OSError(errno.ENODEV,

2925

"{} not a character device"

2926

.format(os.devnull))

2927

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

2928

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

2929

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

2930

if null > 2:

2931

os.close(null)

2932

2933

2934

def main():

2935

2936

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

2937

# Parsing of options, both command line and config file

2938

2939

parser = argparse.ArgumentParser()

2940

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

2941

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

2942

help="show version number and exit")

2943

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

2944

help="Bind to interface IF")

2945

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

2946

help="Address to listen for requests on")

2947

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

2948

help="Port number to receive requests on")

2949

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

2950

help="Run self-test")

2951

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

2952

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

2953

" to terminal", default=None)

2954

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

2955

help="Debug level for stdout output")

2956

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

2957

" priority string (see GnuTLS documentation)")

2958

parser.add_argument("--servicename",

2959

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

2960

parser.add_argument("--configdir",

2961

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

2962

help="Directory to search for configuration"

2963

" files")

2964

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

2965

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

2966

" system bus interface", default=None)

2967

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

2968

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

2969

default=None)

2970

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

2971

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

2972

" state", default=None)

2973

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

2974

help="Specify a file descriptor to a network"

2975

" socket to use instead of creating one")

2976

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

2977

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

2978

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

2979

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

2980

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

2981

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

2982

default=None)

2983

2984

options = parser.parse_args()

2985

2986

# Default values for config file for server-global settings

2987

if gnutls.has_rawpk:

2988

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

2989

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

2990

else:

2991

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

2992

":+SIGN-DSA-SHA256")

2993

server_defaults = {"interface": "",

2994

"address": "",

2995

"port": "",

2996

"debug": "False",

2997

"priority": priority,

2998

"servicename": "Mandos",

2999

"use_dbus": "True",

3000

"use_ipv6": "True",

3001

"debuglevel": "",

3002

"restore": "True",

3003

"socket": "",

3004

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

3005

"foreground": "False",

3006

"zeroconf": "True",

3007

}

3008

del priority

3009

3010

# Parse config file for server-global settings

3011

server_config = configparser.ConfigParser(server_defaults)

3012

del server_defaults

3013

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

3014

# Convert the ConfigParser object to a dict

3015

server_settings = server_config.defaults()

3016

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

3017

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

3018

"foreground", "zeroconf"):

3019

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

3020

option)

3021

if server_settings["port"]:

3022

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

3023

"port")

3024

if server_settings["socket"]:

3025

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

3026

"socket")

3027

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

3028

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

3029

# happen with a supplied network socket.

3030

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

3031

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

3032

["socket"])

3033

del server_config

3034

3035

# Override the settings from the config file with command line

3036

# options, if set.

3037

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

3038

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

3039

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

3040

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

3041

value = getattr(options, option)

3042

if value is not None:

3043

server_settings[option] = value

3044

del options

3045

# Force all strings to be unicode

3046

for option in server_settings.keys():

3047

if isinstance(server_settings[option], bytes):

3048

server_settings[option] = (server_settings[option]

3049

.decode("utf-8"))

3050

# Force all boolean options to be boolean

3051

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

3052

"foreground", "zeroconf"):

3053

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

3054

# Debug implies foreground

3055

if server_settings["debug"]:

3056

server_settings["foreground"] = True

3057

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

3058

3059

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

3060

3061

if (not server_settings["zeroconf"]

3062

and not (server_settings["port"]

3063

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

3064

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

3065

3066

# For convenience

3067

debug = server_settings["debug"]

3068

debuglevel = server_settings["debuglevel"]

3069

use_dbus = server_settings["use_dbus"]

3070

use_ipv6 = server_settings["use_ipv6"]

3071

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

3072

stored_state_file)

3073

foreground = server_settings["foreground"]

3074

zeroconf = server_settings["zeroconf"]

3075

3076

if debug:

3077

initlogger(debug, logging.DEBUG)

3078

else:

3079

if not debuglevel:

3080

initlogger(debug)

3081

else:

3082

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

3083

initlogger(debug, level)

3084

3085

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

3086

syslogger.setFormatter(

3087

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

3088

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

3089

server_settings["servicename"])))

3090

3091

# Parse config file with clients

3092

client_config = configparser.ConfigParser(Client.client_defaults)

3093

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

3094

"clients.conf"))

3095

3096

global mandos_dbus_service

3097

mandos_dbus_service = None

3098

3099

socketfd = None

3100

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

3101

socketfd = server_settings["socket"]

3102

tcp_server = MandosServer(

3103

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

3104

ClientHandler,

3105

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

3106

use_ipv6=use_ipv6,

3107

gnutls_priority=server_settings["priority"],

3108

use_dbus=use_dbus,

3109

socketfd=socketfd)

3110

if not foreground:

3111

pidfilename = "/run/mandos.pid"

3112

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

3113

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

3114

pidfile = None

3115

try:

3116

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

3117

except IOError as e:

3118

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

3119

exc_info=e)

3120

3121

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

3122

("mandos", "mandos"),

3123

("nobody", "nogroup")):

3124

try:

3125

uid = pwd.getpwnam(name).pw_uid

3126

gid = pwd.getpwnam(group).pw_gid

3127

break

3128

except KeyError:

3129

continue

3130

else:

3131

uid = 65534

3132

gid = 65534

3133

try:

3134

os.setgid(gid)

3135

os.setuid(uid)

3136

if debug:

3137

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

3138

gid))

3139

except OSError as error:

3140

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

3141

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

3142

if error.errno != errno.EPERM:

3143

raise

3144

3145

if debug:

3146

# Enable all possible GnuTLS debugging

3147

3148

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

3149

# - GnuTLS manual

3150

gnutls.global_set_log_level(11)

3151

3152

@gnutls.log_func

3153

def debug_gnutls(level, string):

3154

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

3155

3156

gnutls.global_set_log_function(debug_gnutls)

3157

3158

# Redirect stdin so all checkers get /dev/null

3159

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

3160

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

3161

if null > 2:

3162

os.close(null)

3163

3164

# Need to fork before connecting to D-Bus

3165

if not foreground:

3166

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

3167

daemon()

3168

3169

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

3170

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

3171

# need to inform GLib that threads will be used.

3172

GLib.threads_init()

3173

3174

global main_loop

3175

# From the Avahi example code

3176

DBusGMainLoop(set_as_default=True)

3177

main_loop = GLib.MainLoop()

425

try:

426

suffix=unicode(interval[-1])

427

value=int(interval[:-1])

428

if suffix == u"d":

429

delta = datetime.timedelta(value)

430

elif suffix == u"s":

431

delta = datetime.timedelta(0, value)

432

elif suffix == u"m":

433

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

434

elif suffix == u"h":

435

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

436

elif suffix == u"w":

437

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

438

else:

439

raise ValueError

440

except (ValueError, IndexError):

441

raise ValueError

442

return delta

443

444

445

def add_service():

446

"""From the Avahi server example code"""

447

global group, serviceName, serviceType, servicePort, serviceTXT, \

448

domain, host

449

if group is None:

450

group = dbus.Interface(

451

bus.get_object( avahi.DBUS_NAME,

452

server.EntryGroupNew()),

453

avahi.DBUS_INTERFACE_ENTRY_GROUP)

454

group.connect_to_signal('StateChanged',

455

entry_group_state_changed)

456

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

457

serviceName, serviceType)

458

459

group.AddService(

460

serviceInterface, # interface

461

avahi.PROTO_INET6, # protocol

462

dbus.UInt32(0), # flags

463

serviceName, serviceType,

464

domain, host,

465

dbus.UInt16(servicePort),

466

avahi.string_array_to_txt_array(serviceTXT))

467

group.Commit()

468

469

470

def remove_service():

471

"""From the Avahi server example code"""

472

global group

473

474

if not group is None:

475

group.Reset()

476

477

478

def server_state_changed(state):

479

"""From the Avahi server example code"""

480

if state == avahi.SERVER_COLLISION:

481

logger.warning(u"Server name collision")

482

remove_service()

483

elif state == avahi.SERVER_RUNNING:

484

add_service()

485

486

487

def entry_group_state_changed(state, error):

488

"""From the Avahi server example code"""

489

global serviceName, server, rename_count

490

491

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

492

493

if state == avahi.ENTRY_GROUP_ESTABLISHED:

494

logger.debug(u"Service established.")

495

elif state == avahi.ENTRY_GROUP_COLLISION:

496

497

rename_count = rename_count - 1

498

if rename_count > 0:

499

name = server.GetAlternativeServiceName(name)

500

logger.warning(u"Service name collision, "

501

u"changing name to '%s' ...", name)

502

remove_service()

503

add_service()

504

505

else:

506

logger.error(u"No suitable service name found "

507

u"after %i retries, exiting.",

508

n_rename)

509

main_loop.quit()

510

elif state == avahi.ENTRY_GROUP_FAILURE:

511

logger.error(u"Error in group state changed %s",

512

unicode(error))

513

main_loop.quit()

514

return

515

516

517

def if_nametoindex(interface):

518

"""Call the C function if_nametoindex()"""

519

try:

520

libc = ctypes.cdll.LoadLibrary("libc.so.6")

521

return libc.if_nametoindex(interface)

522

except (OSError, AttributeError):

523

if "struct" not in sys.modules:

524

import struct

525

if "fcntl" not in sys.modules:

526

import fcntl

527

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

528

s = socket.socket()

529

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

530

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

531

s.close()

532

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

533

return interface_index

534

535

536

if __name__ == '__main__':

537

parser = OptionParser()

538

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

539

default=None, metavar="IF",

540

help="Bind to interface IF")

541

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

542

metavar="FILE",

543

help="Public key certificate PEM file to use")

544

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

545

metavar="FILE",

546

help="Private key PEM file to use")

547

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

548

metavar="FILE",

549

help="Certificate Authority certificate PEM file to use")

550

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

551

metavar="FILE",

552

help="Certificate Revokation List PEM file to use")

553

parser.add_option("-p", "--port", type="int", default=None,

554

help="Port number to receive requests on")

555

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

556

default="1h",

557

help="Amount of downtime allowed for clients")

558

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

559

default="5m",

560

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

561

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

562

help="Run self-test")

563

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

564

help="Debug mode")

565

(options, args) = parser.parse_args()

566

567

if options.check:

568

import doctest

569

doctest.testmod()

570

sys.exit()

571

572

# Parse the time arguments

573

try:

574

options.timeout = string_to_delta(options.timeout)

575

except ValueError:

576

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

577

try:

578

options.interval = string_to_delta(options.interval)

579

except ValueError:

580

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

581

582

# Parse config file

583

defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }

584

client_config = ConfigParser.SafeConfigParser(defaults)

585

#client_config.readfp(open("secrets.conf"), "secrets.conf")

586

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

587

588

# From the Avahi server example code

589

DBusGMainLoop(set_as_default=True )

590

main_loop = gobject.MainLoop()

3178

591

bus = dbus.SystemBus()

3179

# End of Avahi example code

3180

if use_dbus:

3181

try:

3182

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

3183

bus,

3184

do_not_queue=True)

3185

old_bus_name = dbus.service.BusName(

3186

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

3187

do_not_queue=True)

3188

except dbus.exceptions.DBusException as e:

3189

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

3190

use_dbus = False

3191

server_settings["use_dbus"] = False

3192

tcp_server.use_dbus = False

3193

if zeroconf:

3194

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3195

service = AvahiServiceToSyslog(

3196

name=server_settings["servicename"],

3197

servicetype="_mandos._tcp",

3198

protocol=protocol,

3199

bus=bus)

3200

if server_settings["interface"]:

3201

service.interface = if_nametoindex(

3202

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

3203

3204

global multiprocessing_manager

3205

multiprocessing_manager = multiprocessing.Manager()

3206

3207

client_class = Client

3208

if use_dbus:

3209

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

3210

3211

client_settings = Client.config_parser(client_config)

3212

old_client_settings = {}

3213

clients_data = {}

3214

3215

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

3216

global wnull

3217

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

3218

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

3219

# mode

3220

if debug or not foreground:

3221

wnull.close()

3222

3223

# Get client data and settings from last running state.

3224

if server_settings["restore"]:

3225

try:

3226

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

3227

if sys.version_info.major == 2:

3228

clients_data, old_client_settings = pickle.load(

3229

stored_state)

3230

else:

3231

bytes_clients_data, bytes_old_client_settings = (

3232

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

3233

# Fix bytes to strings

3234

# clients_data

3235

# .keys()

3236

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

3237

if isinstance(key, bytes)

3238

else key): value

3239

for key, value in

3240

bytes_clients_data.items()}

3241

del bytes_clients_data

3242

for key in clients_data:

3243

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

3244

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

3245

for k, v in

3246

clients_data[key].items()}

3247

clients_data[key] = value

3248

# .client_structure

3249

value["client_structure"] = [

3250

(s.decode("utf-8")

3251

if isinstance(s, bytes)

3252

else s) for s in

3253

value["client_structure"]]

3254

# .name, .host, and .checker_command

3255

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

3256

if isinstance(value[k], bytes):

3257

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

3258

if "key_id" not in value:

3259

value["key_id"] = ""

3260

elif "fingerprint" not in value:

3261

value["fingerprint"] = ""

3262

# old_client_settings

3263

# .keys()

3264

old_client_settings = {

3265

(key.decode("utf-8")

3266

if isinstance(key, bytes)

3267

else key): value

3268

for key, value in

3269

bytes_old_client_settings.items()}

3270

del bytes_old_client_settings

3271

# .host and .checker_command

3272

for value in old_client_settings.values():

3273

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

3274

if isinstance(value[attribute], bytes):

3275

value[attribute] = (value[attribute]

3276

.decode("utf-8"))

3277

os.remove(stored_state_path)

3278

except IOError as e:

3279

if e.errno == errno.ENOENT:

3280

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

3281

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

3282

else:

3283

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

3284

exc_info=e)

3285

raise

3286

except EOFError as e:

3287

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

3288

"EOFError:",

3289

exc_info=e)

3290

3291

with PGPEngine() as pgp:

3292

for client_name, client in clients_data.items():

3293

# Skip removed clients

3294

if client_name not in client_settings:

3295

continue

3296

3297

# Decide which value to use after restoring saved state.

3298

# We have three different values: Old config file,

3299

# new config file, and saved state.

3300

# New config value takes precedence if it differs from old

3301

# config value, otherwise use saved state.

3302

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

3303

try:

3304

# For each value in new config, check if it

3305

# differs from the old config value (Except for

3306

# the "secret" attribute)

3307

if (name != "secret"

3308

and (value !=

3309

old_client_settings[client_name][name])):

3310

client[name] = value

3311

except KeyError:

3312

pass

3313

3314

# Clients who has passed its expire date can still be

3315

# enabled if its last checker was successful. A Client

3316

# whose checker succeeded before we stored its state is

3317

# assumed to have successfully run all checkers during

3318

# downtime.

3319

if client["enabled"]:

3320

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

3321

if not client["last_checked_ok"]:

3322

logger.warning(

3323

"disabling client {} - Client never "

3324

"performed a successful checker".format(

3325

client_name))

3326

client["enabled"] = False

3327

elif client["last_checker_status"] != 0:

3328

logger.warning(

3329

"disabling client {} - Client last"

3330

" checker failed with error code"

3331

" {}".format(

3332

client_name,

3333

client["last_checker_status"]))

3334

client["enabled"] = False

3335

else:

3336

client["expires"] = (

3337

datetime.datetime.utcnow()

3338

+ client["timeout"])

3339

logger.debug("Last checker succeeded,"

3340

" keeping {} enabled".format(

3341

client_name))

3342

try:

3343

client["secret"] = pgp.decrypt(

3344

client["encrypted_secret"],

3345

client_settings[client_name]["secret"])

3346

except PGPError:

3347

# If decryption fails, we use secret from new settings

3348

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

3349

client_name))

3350

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

3351

["secret"])

3352

3353

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

3354

for client_name in (set(old_client_settings)

3355

- set(client_settings)):

3356

del clients_data[client_name]

3357

for client_name in (set(client_settings)

3358

- set(old_client_settings)):

3359

clients_data[client_name] = client_settings[client_name]

3360

3361

# Create all client objects

3362

for client_name, client in clients_data.items():

3363

tcp_server.clients[client_name] = client_class(

3364

name=client_name,

3365

settings=client,

3366

server_settings=server_settings)

3367

3368

if not tcp_server.clients:

3369

logger.warning("No clients defined")

3370

3371

if not foreground:

3372

if pidfile is not None:

3373

pid = os.getpid()

3374

try:

3375

with pidfile:

3376

print(pid, file=pidfile)

3377

except IOError:

3378

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

3379

pidfilename, pid)

3380

del pidfile

3381

del pidfilename

3382

3383

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

3384

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3385

lambda: main_loop.quit() and False)

3386

3387

if use_dbus:

3388

3389

@alternate_dbus_interfaces(

3390

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

3391

class MandosDBusService(DBusObjectWithObjectManager):

3392

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

3393

3394

def __init__(self):

3395

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

3396

3397

_interface = "se.recompile.Mandos"

3398

3399

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

3400

def ClientAdded(self, objpath):

3401

"D-Bus signal"

3402

pass

3403

3404

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

3405

def ClientNotFound(self, key_id, address):

3406

"D-Bus signal"

3407

pass

3408

3409

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

3410

"true"})

3411

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

3412

def ClientRemoved(self, objpath, name):

3413

"D-Bus signal"

3414

pass

3415

3416

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

3417

"true"})

3418

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

3419

def GetAllClients(self):

3420

"D-Bus method"

3421

return dbus.Array(c.dbus_object_path for c in

3422

tcp_server.clients.values())

3423

3424

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

3425

"true"})

3426

@dbus.service.method(_interface,

3427

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

3428

def GetAllClientsWithProperties(self):

3429

"D-Bus method"

3430

return dbus.Dictionary(

3431

{c.dbus_object_path: c.GetAll(

3432

"se.recompile.Mandos.Client")

3433

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

3434

signature="oa{sv}")

3435

3436

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

3437

def RemoveClient(self, object_path):

3438

"D-Bus method"

3439

for c in tcp_server.clients.values():

3440

if c.dbus_object_path == object_path:

3441

del tcp_server.clients[c.name]

3442

c.remove_from_connection()

3443

# Don't signal the disabling

3444

c.disable(quiet=True)

3445

# Emit D-Bus signal for removal

3446

self.client_removed_signal(c)

3447

return

3448

raise KeyError(object_path)

3449

3450

del _interface

3451

3452

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3453

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

3454

def GetManagedObjects(self):

3455

"""D-Bus method"""

3456

return dbus.Dictionary(

3457

{client.dbus_object_path:

3458

dbus.Dictionary(

3459

{interface: client.GetAll(interface)

3460

for interface in

3461

client._get_all_interface_names()})

3462

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

3463

3464

def client_added_signal(self, client):

3465

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

3466

if use_dbus:

3467

# New standard signal

3468

self.InterfacesAdded(

3469

client.dbus_object_path,

3470

dbus.Dictionary(

3471

{interface: client.GetAll(interface)

3472

for interface in

3473

client._get_all_interface_names()}))

3474

# Old signal

3475

self.ClientAdded(client.dbus_object_path)

3476

3477

def client_removed_signal(self, client):

3478

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

3479

if use_dbus:

3480

# New standard signal

3481

self.InterfacesRemoved(

3482

client.dbus_object_path,

3483

client._get_all_interface_names())

3484

# Old signal

3485

self.ClientRemoved(client.dbus_object_path,

3486

client.name)

3487

3488

mandos_dbus_service = MandosDBusService()

3489

3490

# Save modules to variables to exempt the modules from being

3491

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

3492

mp = multiprocessing

3493

wn = wnull

3494

3495

def cleanup():

3496

"Cleanup function; run on exit"

3497

if zeroconf:

3498

service.cleanup()

3499

3500

mp.active_children()

3501

wn.close()

3502

if not (tcp_server.clients or client_settings):

3503

return

3504

3505

# Store client before exiting. Secrets are encrypted with key

3506

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

3507

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

3508

clients = {}

3509

with PGPEngine() as pgp:

3510

for client in tcp_server.clients.values():

3511

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

3512

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

3513

key)

3514

client_dict = {}

3515

3516

# A list of attributes that can not be pickled

3517

# + secret.

3518

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

3519

"checker", "server_settings"}

3520

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

3521

.Object):

3522

exclude.add(name)

3523

3524

client_dict["encrypted_secret"] = (client

3525

.encrypted_secret)

3526

for attr in client.client_structure:

3527

if attr not in exclude:

3528

client_dict[attr] = getattr(client, attr)

3529

3530

clients[client.name] = client_dict

3531

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

3532

3533

try:

3534

with tempfile.NamedTemporaryFile(

3535

mode='wb',

3536

suffix=".pickle",

3537

prefix='clients-',

3538

dir=os.path.dirname(stored_state_path),

3539

delete=False) as stored_state:

3540

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

3541

protocol=2)

3542

tempname = stored_state.name

3543

os.rename(tempname, stored_state_path)

3544

except (IOError, OSError) as e:

3545

if not debug:

3546

try:

3547

os.remove(tempname)

3548

except NameError:

3549

pass

3550

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

3551

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

3552

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

3553

else:

3554

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

3555

exc_info=e)

3556

raise

3557

3558

# Delete all clients, and settings from config

3559

while tcp_server.clients:

3560

name, client = tcp_server.clients.popitem()

3561

if use_dbus:

3562

client.remove_from_connection()

3563

# Don't signal the disabling

3564

client.disable(quiet=True)

3565

# Emit D-Bus signal for removal

3566

if use_dbus:

3567

mandos_dbus_service.client_removed_signal(client)

3568

client_settings.clear()

3569

3570

atexit.register(cleanup)

3571

3572

for client in tcp_server.clients.values():

3573

if use_dbus:

3574

# Emit D-Bus signal for adding

3575

mandos_dbus_service.client_added_signal(client)

3576

# Need to initiate checking of clients

3577

if client.enabled:

3578

client.init_checker()

3579

3580

tcp_server.enable()

3581

tcp_server.server_activate()

3582

3583

# Find out what port we got

3584

if zeroconf:

3585

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

3586

if use_ipv6:

3587

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

3588

" flowinfo %d, scope_id %d",

3589

*tcp_server.socket.getsockname())

3590

else: # IPv4

3591

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

3592

*tcp_server.socket.getsockname())

3593

3594

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

3595

592

server = dbus.Interface(

593

bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),

594

avahi.DBUS_INTERFACE_SERVER )

595

# End of Avahi example code

596

597

debug = options.debug

598

599

clients = Set()

600

def remove_from_clients(client):

601

clients.remove(client)

602

if not clients:

603

logger.debug(u"No clients left, exiting")

604

main_loop.quit()

605

606

clients.update(Set(Client(name=section, options=options,

607

stop_hook = remove_from_clients,

608

**(dict(client_config\

609

.items(section))))

610

for section in client_config.sections()))

611

for client in clients:

612

client.start()

613

614

tcp_server = IPv6_TCPServer((None, options.port),

615

tcp_handler,

616

options=options,

617

clients=clients)

618

# Find out what random port we got

619

servicePort = tcp_server.socket.getsockname()[1]

620

logger.debug(u"Now listening on port %d", servicePort)

621

622

if options.interface is not None:

623

serviceInterface = if_nametoindex(options.interface)

624

625

# From the Avahi server example code

626

server.connect_to_signal("StateChanged", server_state_changed)

627

server_state_changed(server.GetState())

628

# End of Avahi example code

629

630

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

631

lambda *args, **kwargs:

632

tcp_server.handle_request(*args[2:],

633

**kwargs) or True)

3596

634

try:

3597

if zeroconf:

3598

# From the Avahi example code

3599

try:

3600

service.activate()

3601

except dbus.exceptions.DBusException as error:

3602

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

3603

cleanup()

3604

sys.exit(1)

3605

# End of Avahi example code

3606

3607

GLib.io_add_watch(

3608

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

3609

GLib.PRIORITY_DEFAULT, GLib.IO_IN,

3610

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

3611

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

3612

3613

logger.debug("Starting main loop")

3614

635

main_loop.run()

3615

except AvahiError as error:

3616

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

3617

cleanup()

3618

sys.exit(1)

3619

636

except KeyboardInterrupt:

3620

if debug:

3621

print("", file=sys.stderr)

3622

logger.debug("Server received KeyboardInterrupt")

3623

logger.debug("Server exiting")

3624

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

3625

cleanup()

3626

3627

3628

def should_only_run_tests():

3629

parser = argparse.ArgumentParser(add_help=False)

3630

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

3631

args, unknown_args = parser.parse_known_args()

3632

run_tests = args.check

3633

if run_tests:

3634

# Remove --check argument from sys.argv

3635

sys.argv[1:] = unknown_args

3636

return run_tests

3637

3638

# Add all tests from doctest strings

3639

def load_tests(loader, tests, none):

3640

import doctest

3641

tests.addTests(doctest.DocTestSuite())

3642

return tests

3643

3644

if __name__ == '__main__':

3645

try:

3646

if should_only_run_tests():

3647

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

3648

unittest.main()

3649

else:

3650

main()

3651

finally:

3652

logging.shutdown()

637

print

638

639

# Cleanup here

640

641

# From the Avahi server example code

642

if not group is None:

643

group.Free()

644

# End of Avahi example code

645

646

for client in clients:

647

client.stop_hook = None

648

client.stop()