/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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6

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

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# 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 = "1.8.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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

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syslogger = None

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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"])

204

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

233

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

if self.checker is not None:

1057

self.checker.join()

1058

self.checker_callback_tag = None

1059

self.checker = None

1060

1061

if returncode >= 0:

1062

self.last_checker_status = returncode

1063

self.last_checker_signal = None

1064

if self.last_checker_status == 0:

1065

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

1066

vars(self))

1067

self.checked_ok()

1068

else:

1069

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

1070

else:

1071

self.last_checker_status = -1

1072

self.last_checker_signal = -returncode

1073

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?",

1074

198

vars(self))

1075

return False

1076

1077

def checked_ok(self):

1078

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

1079

self.last_checked_ok = datetime.datetime.utcnow()

1080

self.last_checker_status = 0

1081

self.last_checker_signal = None

1082

self.bump_timeout()

1083

1084

def bump_timeout(self, timeout=None):

1085

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

1086

if timeout is None:

1087

timeout = self.timeout

1088

if self.disable_initiator_tag is not None:

1089

GLib.source_remove(self.disable_initiator_tag)

1090

self.disable_initiator_tag = None

1091

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

1092

self.disable_initiator_tag = GLib.timeout_add(

1093

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

1094

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

1095

1096

def need_approval(self):

1097

self.last_approval_request = datetime.datetime.utcnow()

1098

199

else:

200

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

201

vars(self))

202

self.checker = None

203

self.checker_callback_tag = None

1099

204

def start_checker(self):

1100

205

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

1101

1102

206

If a checker already exists, leave it running and do

1103

207

nothing."""

1104

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

1105

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

1106

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

1107

# would inevitably timeout, since no checker would get a

1108

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

1109

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

1110

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

1111

# should be.

1112

1113

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

1114

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

1115

self.checker.join()

1116

self.checker = None

1117

# Start a new checker if needed

1118

208

if self.checker is None:

1119

# Escape attributes for the shell

1120

escaped_attrs = {

1121

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

1122

for attr in self.runtime_expansions}

1123

try:

1124

command = self.checker_command % escaped_attrs

1125

except TypeError as error:

1126

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

1127

self.checker_command,

1128

exc_info=error)

1129

return True # Try again later

1130

self.current_checker_command = command

1131

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

1132

self.name)

1133

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

1134

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

1135

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

1136

# always replaced by /dev/null.)

1137

# The exception is when not debugging but nevertheless

1138

# running in the foreground; use the previously

1139

# created wnull.

1140

popen_args = {"close_fds": True,

1141

"shell": True,

1142

"cwd": "/"}

1143

if (not self.server_settings["debug"]

1144

and self.server_settings["foreground"]):

1145

popen_args.update({"stdout": wnull,

1146

"stderr": wnull})

1147

pipe = multiprocessing.Pipe(duplex=False)

1148

self.checker = multiprocessing.Process(

1149

target=call_pipe,

1150

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

1151

kwargs=popen_args)

1152

self.checker.start()

1153

self.checker_callback_tag = GLib.io_add_watch(

1154

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

1155

GLib.PRIORITY_DEFAULT, GLib.IO_IN,

1156

self.checker_callback, pipe[0], command)

1157

# 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

1158

237

return True

1159

1160

238

def stop_checker(self):

1161

239

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

1162

if self.checker_callback_tag:

1163

GLib.source_remove(self.checker_callback_tag)

1164

self.checker_callback_tag = None

1165

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

240

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

1166

241

return

1167

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

1168

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)

1169

247

self.checker = None

1170

1171

1172

def dbus_service_property(dbus_interface,

1173

signature="v",

1174

access="readwrite",

1175

byte_arrays=False):

1176

"""Decorators for marking methods of a DBusObjectWithProperties to

1177

become properties on the D-Bus.

1178

1179

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

1180

and with one argument by "Set".

1181

1182

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

1183

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

1184

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

1185

"""

1186

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

1187

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

1188

if byte_arrays and signature != "ay":

1189

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

1190

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

1191

1192

def decorator(func):

1193

func._dbus_is_property = True

1194

func._dbus_interface = dbus_interface

1195

func._dbus_signature = signature

1196

func._dbus_access = access

1197

func._dbus_name = func.__name__

1198

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

1199

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

1200

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

1201

return func

1202

1203

return decorator

1204

1205

1206

def dbus_interface_annotations(dbus_interface):

1207

"""Decorator for marking functions returning interface annotations

1208

1209

Usage:

1210

1211

@dbus_interface_annotations("org.example.Interface")

1212

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

1213

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

1214

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

1215

"false"}

1216

"""

1217

1218

def decorator(func):

1219

func._dbus_is_interface = True

1220

func._dbus_interface = dbus_interface

1221

func._dbus_name = dbus_interface

1222

return func

1223

1224

return decorator

1225

1226

1227

def dbus_annotations(annotations):

1228

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

1229

Usage:

1230

1231

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

1232

"org.freedesktop.DBus.Property."

1233

"EmitsChangedSignal": "false"})

1234

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

1235

access="r")

1236

def Property_dbus_property(self):

1237

return dbus.Boolean(False)

1238

1239

See also the DBusObjectWithAnnotations class.

1240

"""

1241

1242

def decorator(func):

1243

func._dbus_annotations = annotations

1244

return func

1245

1246

return decorator

1247

1248

1249

class DBusPropertyException(dbus.exceptions.DBusException):

1250

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

1251

"""

1252

pass

1253

1254

1255

class DBusPropertyAccessException(DBusPropertyException):

1256

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

1257

"""

1258

pass

1259

1260

1261

class DBusPropertyNotFound(DBusPropertyException):

1262

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

1263

"""

1264

pass

1265

1266

1267

class DBusObjectWithAnnotations(dbus.service.Object):

1268

"""A D-Bus object with annotations.

1269

1270

Classes inheriting from this can use the dbus_annotations

1271

decorator to add annotations to methods or signals.

1272

"""

1273

1274

@staticmethod

1275

def _is_dbus_thing(thing):

1276

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

1277

1278

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

1279

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

1280

"""

1281

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

1282

False)

1283

1284

def _get_all_dbus_things(self, thing):

1285

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

1286

"""

1287

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

1288

athing.__get__(self))

1289

for cls in self.__class__.__mro__

1290

for name, athing in

1291

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

1292

1293

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1294

out_signature="s",

1295

path_keyword='object_path',

1296

connection_keyword='connection')

1297

def Introspect(self, object_path, connection):

1298

"""Overloading of standard D-Bus method.

1299

1300

Inserts annotation tags on methods and signals.

1301

"""

1302

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

1303

connection)

1304

try:

1305

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

1306

1307

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

1308

# Add annotation tags

1309

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

1310

for tag in if_tag.getElementsByTagName(typ):

1311

annots = dict()

1312

for name, prop in (self.

1313

_get_all_dbus_things(typ)):

1314

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

1315

and prop._dbus_interface

1316

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

1317

annots.update(getattr(

1318

prop, "_dbus_annotations", {}))

1319

for name, value in annots.items():

1320

ann_tag = document.createElement(

1321

"annotation")

1322

ann_tag.setAttribute("name", name)

1323

ann_tag.setAttribute("value", value)

1324

tag.appendChild(ann_tag)

1325

# Add interface annotation tags

1326

for annotation, value in dict(

1327

itertools.chain.from_iterable(

1328

annotations().items()

1329

for name, annotations

1330

in self._get_all_dbus_things("interface")

1331

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

1332

)).items():

1333

ann_tag = document.createElement("annotation")

1334

ann_tag.setAttribute("name", annotation)

1335

ann_tag.setAttribute("value", value)

1336

if_tag.appendChild(ann_tag)

1337

# Fix argument name for the Introspect method itself

1338

if (if_tag.getAttribute("name")

1339

== dbus.INTROSPECTABLE_IFACE):

1340

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

1341

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

1342

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

1343

if (arg.getAttribute("direction")

1344

== "out"):

1345

arg.setAttribute("name",

1346

"xml_data")

1347

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

1348

document.unlink()

1349

except (AttributeError, xml.dom.DOMException,

1350

xml.parsers.expat.ExpatError) as error:

1351

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

1352

exc_info=error)

1353

return xmlstring

1354

1355

1356

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1357

"""A D-Bus object with properties.

1358

1359

Classes inheriting from this can use the dbus_service_property

1360

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

1361

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

1362

"""

1363

1364

def _get_dbus_property(self, interface_name, property_name):

1365

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

1366

property with the specified name and interface.

1367

"""

1368

for cls in self.__class__.__mro__:

1369

for name, value in inspect.getmembers(

1370

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

1371

if (value._dbus_name == property_name

1372

and value._dbus_interface == interface_name):

1373

return value.__get__(self)

1374

1375

# No such property

1376

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

1377

self.dbus_object_path, interface_name, property_name))

1378

1379

@classmethod

1380

def _get_all_interface_names(cls):

1381

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

1382

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

1383

"_dbus_interface", None)

1384

for x in (inspect.getmro(cls))

1385

for attr in dir(x))

1386

if name is not None)

1387

1388

@dbus.service.method(dbus.PROPERTIES_IFACE,

1389

in_signature="ss",

1390

out_signature="v")

1391

def Get(self, interface_name, property_name):

1392

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

1393

"""

1394

prop = self._get_dbus_property(interface_name, property_name)

1395

if prop._dbus_access == "write":

1396

raise DBusPropertyAccessException(property_name)

1397

value = prop()

1398

if not hasattr(value, "variant_level"):

1399

return value

1400

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

1401

1402

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

1403

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

1404

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

1405

"""

1406

prop = self._get_dbus_property(interface_name, property_name)

1407

if prop._dbus_access == "read":

1408

raise DBusPropertyAccessException(property_name)

1409

if prop._dbus_get_args_options["byte_arrays"]:

1410

# The byte_arrays option is not supported yet on

1411

# signatures other than "ay".

1412

if prop._dbus_signature != "ay":

1413

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

1414

"'ay' signature {!r}"

1415

.format(prop._dbus_signature))

1416

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

1417

for byte in value))

1418

prop(value)

1419

1420

@dbus.service.method(dbus.PROPERTIES_IFACE,

1421

in_signature="s",

1422

out_signature="a{sv}")

1423

def GetAll(self, interface_name):

1424

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

1425

standard.

1426

1427

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

1428

"""

1429

properties = {}

1430

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

1431

if (interface_name

1432

and interface_name != prop._dbus_interface):

1433

# Interface non-empty but did not match

1434

continue

1435

# Ignore write-only properties

1436

if prop._dbus_access == "write":

1437

continue

1438

value = prop()

1439

if not hasattr(value, "variant_level"):

1440

properties[name] = value

1441

continue

1442

properties[name] = type(value)(

1443

value, variant_level=value.variant_level + 1)

1444

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

1445

1446

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

1447

def PropertiesChanged(self, interface_name, changed_properties,

1448

invalidated_properties):

1449

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

1450

standard.

1451

"""

1452

pass

1453

1454

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1455

out_signature="s",

1456

path_keyword='object_path',

1457

connection_keyword='connection')

1458

def Introspect(self, object_path, connection):

1459

"""Overloading of standard D-Bus method.

1460

1461

Inserts property tags and interface annotation tags.

1462

"""

1463

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1464

object_path,

1465

connection)

1466

try:

1467

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

1468

1469

def make_tag(document, name, prop):

1470

e = document.createElement("property")

1471

e.setAttribute("name", name)

1472

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

1473

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

1474

return e

1475

1476

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

1477

# Add property tags

1478

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

1479

for name, prop

1480

in self._get_all_dbus_things("property")

1481

if prop._dbus_interface

1482

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

1483

if_tag.appendChild(tag)

1484

# Add annotation tags for properties

1485

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

1486

annots = dict()

1487

for name, prop in self._get_all_dbus_things(

1488

"property"):

1489

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

1490

and prop._dbus_interface

1491

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

1492

annots.update(getattr(

1493

prop, "_dbus_annotations", {}))

1494

for name, value in annots.items():

1495

ann_tag = document.createElement(

1496

"annotation")

1497

ann_tag.setAttribute("name", name)

1498

ann_tag.setAttribute("value", value)

1499

tag.appendChild(ann_tag)

1500

# Add the names to the return values for the

1501

# "org.freedesktop.DBus.Properties" methods

1502

if (if_tag.getAttribute("name")

1503

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

1504

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

1505

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

1506

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

1507

if (arg.getAttribute("direction")

1508

== "out"):

1509

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

1510

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

1511

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

1512

if (arg.getAttribute("direction")

1513

== "out"):

1514

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

1515

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

1516

document.unlink()

1517

except (AttributeError, xml.dom.DOMException,

1518

xml.parsers.expat.ExpatError) as error:

1519

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

1520

exc_info=error)

1521

return xmlstring

1522

1523

1524

try:

1525

dbus.OBJECT_MANAGER_IFACE

1526

except AttributeError:

1527

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

1528

1529

1530

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1531

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

1532

1533

Classes inheriting from this exposes the standard

1534

GetManagedObjects call and the InterfacesAdded and

1535

InterfacesRemoved signals on the standard

1536

"org.freedesktop.DBus.ObjectManager" interface.

1537

1538

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

1539

manually.

1540

"""

1541

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1542

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

1543

def GetManagedObjects(self):

1544

"""This function must be overridden"""

1545

raise NotImplementedError()

1546

1547

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1548

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

1549

def InterfacesAdded(self, object_path, interfaces_and_properties):

1550

pass

1551

1552

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

1553

def InterfacesRemoved(self, object_path, interfaces):

1554

pass

1555

1556

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1557

out_signature="s",

1558

path_keyword='object_path',

1559

connection_keyword='connection')

1560

def Introspect(self, object_path, connection):

1561

"""Overloading of standard D-Bus method.

1562

1563

Override return argument name of GetManagedObjects to be

1564

"objpath_interfaces_and_properties"

1565

"""

1566

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1567

object_path,

1568

connection)

1569

try:

1570

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

1571

1572

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

1573

# Fix argument name for the GetManagedObjects method

1574

if (if_tag.getAttribute("name")

1575

== dbus.OBJECT_MANAGER_IFACE):

1576

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

1577

if (cn.getAttribute("name")

1578

== "GetManagedObjects"):

1579

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

1580

if (arg.getAttribute("direction")

1581

== "out"):

1582

arg.setAttribute(

1583

"name",

1584

"objpath_interfaces"

1585

"_and_properties")

1586

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

1587

document.unlink()

1588

except (AttributeError, xml.dom.DOMException,

1589

xml.parsers.expat.ExpatError) as error:

1590

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

1591

exc_info=error)

1592

return xmlstring

1593

1594

1595

def datetime_to_dbus(dt, variant_level=0):

1596

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

1597

if dt is None:

1598

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

1599

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

1600

1601

1602

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1603

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

1604

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

1605

interface names according to the "alt_interface_names" mapping.

1606

Usage:

1607

1608

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

1609

"net.example.AlternateInterface"})

1610

class SampleDBusObject(dbus.service.Object):

1611

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

1612

def SampleDBusMethod():

1613

pass

1614

1615

The above "SampleDBusMethod" on "SampleDBusObject" will be

1616

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

1617

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

1618

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

1619

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

1620

1621

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

1622

(from DBusObjectWithProperties) and interfaces (from the

1623

dbus_interface_annotations decorator).

1624

"""

1625

1626

def wrapper(cls):

1627

for orig_interface_name, alt_interface_name in (

1628

alt_interface_names.items()):

1629

attr = {}

1630

interface_names = set()

1631

# Go though all attributes of the class

1632

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

1633

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

1634

# with the wrong interface name

1635

if (not hasattr(attribute, "_dbus_interface")

1636

or not attribute._dbus_interface.startswith(

1637

orig_interface_name)):

1638

continue

1639

# Create an alternate D-Bus interface name based on

1640

# the current name

1641

alt_interface = attribute._dbus_interface.replace(

1642

orig_interface_name, alt_interface_name)

1643

interface_names.add(alt_interface)

1644

# Is this a D-Bus signal?

1645

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

1646

# Extract the original non-method undecorated

1647

# function by black magic

1648

if sys.version_info.major == 2:

1649

nonmethod_func = (dict(

1650

zip(attribute.func_code.co_freevars,

1651

attribute.__closure__))

1652

["func"].cell_contents)

1653

else:

1654

nonmethod_func = (dict(

1655

zip(attribute.__code__.co_freevars,

1656

attribute.__closure__))

1657

["func"].cell_contents)

1658

# Create a new, but exactly alike, function

1659

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

1660

# with the alternate D-Bus interface name

1661

new_function = copy_function(nonmethod_func)

1662

new_function = (dbus.service.signal(

1663

alt_interface,

1664

attribute._dbus_signature)(new_function))

1665

# Copy annotations, if any

1666

try:

1667

new_function._dbus_annotations = dict(

1668

attribute._dbus_annotations)

1669

except AttributeError:

1670

pass

1671

1672

# Define a creator of a function to call both the

1673

# original and alternate functions, so both the

1674

# original and alternate signals gets sent when

1675

# the function is called

1676

def fixscope(func1, func2):

1677

"""This function is a scope container to pass

1678

func1 and func2 to the "call_both" function

1679

outside of its arguments"""

1680

1681

@functools.wraps(func2)

1682

def call_both(*args, **kwargs):

1683

"""This function will emit two D-Bus

1684

signals by calling func1 and func2"""

1685

func1(*args, **kwargs)

1686

func2(*args, **kwargs)

1687

# Make wrapper function look like a D-Bus

1688

# signal

1689

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

1690

if name.startswith("_dbus_"):

1691

setattr(call_both, name, attr)

1692

1693

return call_both

1694

# Create the "call_both" function and add it to

1695

# the class

1696

attr[attrname] = fixscope(attribute, new_function)

1697

# Is this a D-Bus method?

1698

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

1699

# Create a new, but exactly alike, function

1700

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

1701

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

1702

# to the class.

1703

attr[attrname] = (

1704

dbus.service.method(

1705

alt_interface,

1706

attribute._dbus_in_signature,

1707

attribute._dbus_out_signature)

1708

(copy_function(attribute)))

1709

# Copy annotations, if any

1710

try:

1711

attr[attrname]._dbus_annotations = dict(

1712

attribute._dbus_annotations)

1713

except AttributeError:

1714

pass

1715

# Is this a D-Bus property?

1716

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

1717

# Create a new, but exactly alike, function

1718

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

1719

# property with the alternate D-Bus interface

1720

# name. Add it to the class.

1721

attr[attrname] = (dbus_service_property(

1722

alt_interface, attribute._dbus_signature,

1723

attribute._dbus_access,

1724

attribute._dbus_get_args_options

1725

["byte_arrays"])

1726

(copy_function(attribute)))

1727

# Copy annotations, if any

1728

try:

1729

attr[attrname]._dbus_annotations = dict(

1730

attribute._dbus_annotations)

1731

except AttributeError:

1732

pass

1733

# Is this a D-Bus interface?

1734

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

1735

# Create a new, but exactly alike, function

1736

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

1737

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

1738

# to the class.

1739

attr[attrname] = (

1740

dbus_interface_annotations(alt_interface)

1741

(copy_function(attribute)))

1742

if deprecate:

1743

# Deprecate all alternate interfaces

1744

iname = "_AlternateDBusNames_interface_annotation{}"

1745

for interface_name in interface_names:

1746

1747

@dbus_interface_annotations(interface_name)

1748

def func(self):

1749

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

1750

"true"}

1751

# Find an unused name

1752

for aname in (iname.format(i)

1753

for i in itertools.count()):

1754

if aname not in attr:

1755

attr[aname] = func

1756

break

1757

if interface_names:

1758

# Replace the class with a new subclass of it with

1759

# methods, signals, etc. as created above.

1760

if sys.version_info.major == 2:

1761

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

1762

(cls, ), attr)

1763

else:

1764

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

1765

(cls, ), attr)

1766

return cls

1767

1768

return wrapper

1769

1770

1771

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

1772

"se.bsnet.fukt.Mandos"})

1773

class ClientDBus(Client, DBusObjectWithProperties):

1774

"""A Client class using D-Bus

1775

1776

Attributes:

1777

dbus_object_path: dbus.ObjectPath

1778

bus: dbus.SystemBus()

1779

"""

1780

1781

runtime_expansions = (Client.runtime_expansions

1782

+ ("dbus_object_path", ))

1783

1784

_interface = "se.recompile.Mandos.Client"

1785

1786

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

1787

1788

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

1789

self.bus = bus

1790

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

1791

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

1792

# the D-Bus

1793

client_object_name = str(self.name).translate(

1794

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

1795

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

1796

self.dbus_object_path = dbus.ObjectPath(

1797

"/clients/" + client_object_name)

1798

DBusObjectWithProperties.__init__(self, self.bus,

1799

self.dbus_object_path)

1800

1801

def notifychangeproperty(transform_func, dbus_name,

1802

type_func=lambda x: x,

1803

variant_level=1,

1804

invalidate_only=False,

1805

_interface=_interface):

1806

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

1807

its changes to DBus.

1808

1809

transform_fun: Function that takes a value and a variant_level

1810

and transforms it to a D-Bus type.

1811

dbus_name: D-Bus name of the variable

1812

type_func: Function that transform the value before sending it

1813

to the D-Bus. Default: no transform

1814

variant_level: D-Bus variant level. Default: 1

1815

"""

1816

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

1817

1818

def setter(self, value):

1819

if hasattr(self, "dbus_object_path"):

1820

if (not hasattr(self, attrname) or

1821

type_func(getattr(self, attrname, None))

1822

!= type_func(value)):

1823

if invalidate_only:

1824

self.PropertiesChanged(

1825

_interface, dbus.Dictionary(),

1826

dbus.Array((dbus_name, )))

1827

else:

1828

dbus_value = transform_func(

1829

type_func(value),

1830

variant_level=variant_level)

1831

self.PropertyChanged(dbus.String(dbus_name),

1832

dbus_value)

1833

self.PropertiesChanged(

1834

_interface,

1835

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

1836

dbus_value}),

1837

dbus.Array())

1838

setattr(self, attrname, value)

1839

1840

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

1841

1842

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1843

approvals_pending = notifychangeproperty(dbus.Boolean,

1844

"ApprovalPending",

1845

type_func=bool)

1846

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

1847

last_enabled = notifychangeproperty(datetime_to_dbus,

1848

"LastEnabled")

1849

checker = notifychangeproperty(

1850

dbus.Boolean, "CheckerRunning",

1851

type_func=lambda checker: checker is not None)

1852

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1853

"LastCheckedOK")

1854

last_checker_status = notifychangeproperty(dbus.Int16,

1855

"LastCheckerStatus")

1856

last_approval_request = notifychangeproperty(

1857

datetime_to_dbus, "LastApprovalRequest")

1858

approved_by_default = notifychangeproperty(dbus.Boolean,

1859

"ApprovedByDefault")

1860

approval_delay = notifychangeproperty(

1861

dbus.UInt64, "ApprovalDelay",

1862

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

1863

approval_duration = notifychangeproperty(

1864

dbus.UInt64, "ApprovalDuration",

1865

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

1866

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

1867

timeout = notifychangeproperty(

1868

dbus.UInt64, "Timeout",

1869

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

1870

extended_timeout = notifychangeproperty(

1871

dbus.UInt64, "ExtendedTimeout",

1872

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

1873

interval = notifychangeproperty(

1874

dbus.UInt64, "Interval",

1875

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

1876

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

1877

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

1878

invalidate_only=True)

1879

1880

del notifychangeproperty

1881

1882

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

1883

try:

1884

self.remove_from_connection()

1885

except LookupError:

1886

pass

1887

if hasattr(DBusObjectWithProperties, "__del__"):

1888

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

1889

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

1890

1891

def checker_callback(self, source, condition,

1892

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

1893

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

1894

connection, command, *args,

1895

**kwargs)

1896

exitstatus = self.last_checker_status

1897

if exitstatus >= 0:

1898

# Emit D-Bus signal

1899

self.CheckerCompleted(dbus.Int16(exitstatus),

1900

# This is specific to GNU libC

1901

dbus.Int64(exitstatus << 8),

1902

dbus.String(command))

1903

else:

1904

# Emit D-Bus signal

1905

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

1906

dbus.Int64(

1907

# This is specific to GNU libC

1908

(exitstatus << 8)

1909

| self.last_checker_signal),

1910

dbus.String(command))

1911

return ret

1912

1913

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

1914

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

1915

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

1916

# Only if new checker process was started

1917

if (self.checker is not None

1918

and old_checker_pid != self.checker.pid):

1919

# Emit D-Bus signal

1920

self.CheckerStarted(self.current_checker_command)

1921

return r

1922

1923

def _reset_approved(self):

1924

self.approved = None

1925

return False

1926

1927

def approve(self, value=True):

1928

self.approved = value

1929

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

1930

* 1000), self._reset_approved)

1931

self.send_changedstate()

1932

1933

# D-Bus methods, signals & properties

1934

1935

# Interfaces

1936

1937

# Signals

1938

1939

# CheckerCompleted - signal

1940

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

1941

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

1942

"D-Bus signal"

1943

pass

1944

1945

# CheckerStarted - signal

1946

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

1947

def CheckerStarted(self, command):

1948

"D-Bus signal"

1949

pass

1950

1951

# PropertyChanged - signal

1952

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

1953

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

1954

def PropertyChanged(self, property, value):

1955

"D-Bus signal"

1956

pass

1957

1958

# GotSecret - signal

1959

@dbus.service.signal(_interface)

1960

def GotSecret(self):

1961

"""D-Bus signal

1962

Is sent after a successful transfer of secret from the Mandos

1963

server to mandos-client

1964

"""

1965

pass

1966

1967

# Rejected - signal

1968

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

1969

def Rejected(self, reason):

1970

"D-Bus signal"

1971

pass

1972

1973

# NeedApproval - signal

1974

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

1975

def NeedApproval(self, timeout, default):

1976

"D-Bus signal"

1977

return self.need_approval()

1978

1979

# Methods

1980

1981

# Approve - method

1982

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

1983

def Approve(self, value):

1984

self.approve(value)

1985

1986

# CheckedOK - method

1987

@dbus.service.method(_interface)

1988

def CheckedOK(self):

1989

self.checked_ok()

1990

1991

# Enable - method

1992

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

1993

@dbus.service.method(_interface)

1994

def Enable(self):

1995

"D-Bus method"

1996

self.enable()

1997

1998

# StartChecker - method

1999

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

2000

@dbus.service.method(_interface)

2001

def StartChecker(self):

2002

"D-Bus method"

2003

self.start_checker()

2004

2005

# Disable - method

2006

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

2007

@dbus.service.method(_interface)

2008

def Disable(self):

2009

"D-Bus method"

2010

self.disable()

2011

2012

# StopChecker - method

2013

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

2014

@dbus.service.method(_interface)

2015

def StopChecker(self):

2016

self.stop_checker()

2017

2018

# Properties

2019

2020

# ApprovalPending - property

2021

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

2022

def ApprovalPending_dbus_property(self):

2023

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

2024

2025

# ApprovedByDefault - property

2026

@dbus_service_property(_interface,

2027

signature="b",

2028

access="readwrite")

2029

def ApprovedByDefault_dbus_property(self, value=None):

2030

if value is None: # get

2031

return dbus.Boolean(self.approved_by_default)

2032

self.approved_by_default = bool(value)

2033

2034

# ApprovalDelay - property

2035

@dbus_service_property(_interface,

2036

signature="t",

2037

access="readwrite")

2038

def ApprovalDelay_dbus_property(self, value=None):

2039

if value is None: # get

2040

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

2041

* 1000)

2042

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

2043

2044

# ApprovalDuration - property

2045

@dbus_service_property(_interface,

2046

signature="t",

2047

access="readwrite")

2048

def ApprovalDuration_dbus_property(self, value=None):

2049

if value is None: # get

2050

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

2051

* 1000)

2052

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

2053

2054

# Name - property

2055

@dbus_annotations(

2056

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

2057

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

2058

def Name_dbus_property(self):

2059

return dbus.String(self.name)

2060

2061

# KeyID - property

2062

@dbus_annotations(

2063

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

2064

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

2065

def KeyID_dbus_property(self):

2066

return dbus.String(self.key_id)

2067

2068

# Fingerprint - property

2069

@dbus_annotations(

2070

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

2071

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

2072

def Fingerprint_dbus_property(self):

2073

return dbus.String(self.fingerprint)

2074

2075

# Host - property

2076

@dbus_service_property(_interface,

2077

signature="s",

2078

access="readwrite")

2079

def Host_dbus_property(self, value=None):

2080

if value is None: # get

2081

return dbus.String(self.host)

2082

self.host = str(value)

2083

2084

# Created - property

2085

@dbus_annotations(

2086

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

2087

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

2088

def Created_dbus_property(self):

2089

return datetime_to_dbus(self.created)

2090

2091

# LastEnabled - property

2092

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

2093

def LastEnabled_dbus_property(self):

2094

return datetime_to_dbus(self.last_enabled)

2095

2096

# Enabled - property

2097

@dbus_service_property(_interface,

2098

signature="b",

2099

access="readwrite")

2100

def Enabled_dbus_property(self, value=None):

2101

if value is None: # get

2102

return dbus.Boolean(self.enabled)

2103

if value:

2104

self.enable()

2105

else:

2106

self.disable()

2107

2108

# LastCheckedOK - property

2109

@dbus_service_property(_interface,

2110

signature="s",

2111

access="readwrite")

2112

def LastCheckedOK_dbus_property(self, value=None):

2113

if value is not None:

2114

self.checked_ok()

2115

return

2116

return datetime_to_dbus(self.last_checked_ok)

2117

2118

# LastCheckerStatus - property

2119

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

2120

def LastCheckerStatus_dbus_property(self):

2121

return dbus.Int16(self.last_checker_status)

2122

2123

# Expires - property

2124

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

2125

def Expires_dbus_property(self):

2126

return datetime_to_dbus(self.expires)

2127

2128

# LastApprovalRequest - property

2129

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

2130

def LastApprovalRequest_dbus_property(self):

2131

return datetime_to_dbus(self.last_approval_request)

2132

2133

# Timeout - property

2134

@dbus_service_property(_interface,

2135

signature="t",

2136

access="readwrite")

2137

def Timeout_dbus_property(self, value=None):

2138

if value is None: # get

2139

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

2140

old_timeout = self.timeout

2141

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

2142

# Reschedule disabling

2143

if self.enabled:

2144

now = datetime.datetime.utcnow()

2145

self.expires += self.timeout - old_timeout

2146

if self.expires <= now:

2147

# The timeout has passed

2148

self.disable()

2149

else:

2150

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

2151

is None):

2152

return

2153

GLib.source_remove(self.disable_initiator_tag)

2154

self.disable_initiator_tag = GLib.timeout_add(

2155

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

2156

self.disable)

2157

2158

# ExtendedTimeout - property

2159

@dbus_service_property(_interface,

2160

signature="t",

2161

access="readwrite")

2162

def ExtendedTimeout_dbus_property(self, value=None):

2163

if value is None: # get

2164

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

2165

* 1000)

2166

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

2167

2168

# Interval - property

2169

@dbus_service_property(_interface,

2170

signature="t",

2171

access="readwrite")

2172

def Interval_dbus_property(self, value=None):

2173

if value is None: # get

2174

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

2175

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

2176

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

2177

return

2178

if self.enabled:

2179

# Reschedule checker run

2180

GLib.source_remove(self.checker_initiator_tag)

2181

self.checker_initiator_tag = GLib.timeout_add(

2182

value, self.start_checker)

2183

self.start_checker() # Start one now, too

2184

2185

# Checker - property

2186

@dbus_service_property(_interface,

2187

signature="s",

2188

access="readwrite")

2189

def Checker_dbus_property(self, value=None):

2190

if value is None: # get

2191

return dbus.String(self.checker_command)

2192

self.checker_command = str(value)

2193

2194

# CheckerRunning - property

2195

@dbus_service_property(_interface,

2196

signature="b",

2197

access="readwrite")

2198

def CheckerRunning_dbus_property(self, value=None):

2199

if value is None: # get

2200

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

2201

if value:

2202

self.start_checker()

2203

else:

2204

self.stop_checker()

2205

2206

# ObjectPath - property

2207

@dbus_annotations(

2208

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

2209

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

2210

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

2211

def ObjectPath_dbus_property(self):

2212

return self.dbus_object_path # is already a dbus.ObjectPath

2213

2214

# Secret = property

2215

@dbus_annotations(

2216

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

2217

"invalidates"})

2218

@dbus_service_property(_interface,

2219

signature="ay",

2220

access="write",

2221

byte_arrays=True)

2222

def Secret_dbus_property(self, value):

2223

self.secret = bytes(value)

2224

2225

del _interface

2226

2227

2228

class ProxyClient:

2229

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

2230

self._pipe = child_pipe

2231

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

2232

if not self._pipe.recv():

2233

raise KeyError(key_id or fpr)

2234

2235

def __getattribute__(self, name):

2236

if name == '_pipe':

2237

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

2238

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

2239

data = self._pipe.recv()

2240

if data[0] == 'data':

2241

return data[1]

2242

if data[0] == 'function':

2243

2244

def func(*args, **kwargs):

2245

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

2246

return self._pipe.recv()[1]

2247

2248

return func

2249

2250

def __setattr__(self, name, value):

2251

if name == '_pipe':

2252

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

2253

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

2254

2255

2256

class ClientHandler(socketserver.BaseRequestHandler, object):

2257

"""A class to handle client connections.

2258

2259

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.

2260

307

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

2261

308

2262

309

def handle(self):

2263

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

2264

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

2265

str(self.client_address))

2266

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

2267

self.server.child_pipe.fileno())

2268

2269

session = gnutls.ClientSession(self.request)

2270

2271

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

2272

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

2273

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

2274

# "+DHE-DSS"))

2275

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

2276

priority = self.server.gnutls_priority

2277

if priority is None:

2278

priority = "NORMAL"

2279

gnutls.priority_set_direct(session._c_object,

2280

priority.encode("utf-8"),

2281

None)

2282

2283

# Start communication using the Mandos protocol

2284

# Get protocol number

2285

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

2286

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

2287

try:

2288

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

2289

raise RuntimeError(line)

2290

except (ValueError, IndexError, RuntimeError) as error:

2291

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

2292

return

2293

2294

# Start GnuTLS connection

2295

try:

2296

session.handshake()

2297

except gnutls.Error as error:

2298

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

2299

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

2300

# established. Just abandon the request.

2301

return

2302

logger.debug("Handshake succeeded")

2303

2304

approval_required = False

2305

try:

2306

if gnutls.has_rawpk:

2307

fpr = b""

2308

try:

2309

key_id = self.key_id(

2310

self.peer_certificate(session))

2311

except (TypeError, gnutls.Error) as error:

2312

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

2313

return

2314

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

2315

2316

else:

2317

key_id = b""

2318

try:

2319

fpr = self.fingerprint(

2320

self.peer_certificate(session))

2321

except (TypeError, gnutls.Error) as error:

2322

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

2323

return

2324

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

2325

2326

try:

2327

client = ProxyClient(child_pipe, key_id, fpr,

2328

self.client_address)

2329

except KeyError:

2330

return

2331

2332

if client.approval_delay:

2333

delay = client.approval_delay

2334

client.approvals_pending += 1

2335

approval_required = True

2336

2337

while True:

2338

if not client.enabled:

2339

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

2340

client.name)

2341

if self.server.use_dbus:

2342

# Emit D-Bus signal

2343

client.Rejected("Disabled")

2344

return

2345

2346

if client.approved or not client.approval_delay:

2347

# We are approved or approval is disabled

2348

break

2349

elif client.approved is None:

2350

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

2351

client.name)

2352

if self.server.use_dbus:

2353

# Emit D-Bus signal

2354

client.NeedApproval(

2355

client.approval_delay.total_seconds()

2356

* 1000, client.approved_by_default)

2357

else:

2358

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

2359

client.name)

2360

if self.server.use_dbus:

2361

# Emit D-Bus signal

2362

client.Rejected("Denied")

2363

return

2364

2365

# wait until timeout or approved

2366

time = datetime.datetime.now()

2367

client.changedstate.acquire()

2368

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

2369

client.changedstate.release()

2370

time2 = datetime.datetime.now()

2371

if (time2 - time) >= delay:

2372

if not client.approved_by_default:

2373

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

2374

" waiting for approval",

2375

client.name)

2376

if self.server.use_dbus:

2377

# Emit D-Bus signal

2378

client.Rejected("Approval timed out")

2379

return

2380

else:

2381

break

2382

else:

2383

delay -= time2 - time

2384

2385

try:

2386

session.send(client.secret)

2387

except gnutls.Error as error:

2388

logger.warning("gnutls send failed",

2389

exc_info=error)

2390

return

2391

2392

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

2393

# bump the timeout using extended_timeout

2394

client.bump_timeout(client.extended_timeout)

2395

if self.server.use_dbus:

2396

# Emit D-Bus signal

2397

client.GotSecret()

2398

2399

finally:

2400

if approval_required:

2401

client.approvals_pending -= 1

2402

try:

2403

session.bye()

2404

except gnutls.Error as error:

2405

logger.warning("GnuTLS bye failed",

2406

exc_info=error)

2407

2408

@staticmethod

2409

def peer_certificate(session):

2410

"Return the peer's certificate as a bytestring"

2411

try:

2412

cert_type = gnutls.certificate_type_get2(session._c_object,

2413

gnutls.CTYPE_PEERS)

2414

except AttributeError:

2415

cert_type = gnutls.certificate_type_get(session._c_object)

2416

if gnutls.has_rawpk:

2417

valid_cert_types = frozenset((gnutls.CRT_RAWPK,))

2418

else:

2419

valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))

2420

# If not a valid certificate type...

2421

if cert_type not in valid_cert_types:

2422

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

2423

valid_cert_types)

2424

# ...return invalid data

2425

return b""

2426

list_size = ctypes.c_uint(1)

2427

cert_list = (gnutls.certificate_get_peers

2428

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

2429

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

2430

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

2431

if list_size.value == 0:

2432

return None

2433

cert = cert_list[0]

2434

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

2435

2436

@staticmethod

2437

def key_id(certificate):

2438

"Convert a certificate bytestring to a hexdigit key ID"

2439

# New GnuTLS "datum" with the public key

2440

datum = gnutls.datum_t(

2441

ctypes.cast(ctypes.c_char_p(certificate),

2442

ctypes.POINTER(ctypes.c_ubyte)),

2443

ctypes.c_uint(len(certificate)))

2444

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

2445

# New empty GnuTLS certificate

2446

pubkey = gnutls.pubkey_t()

2447

gnutls.pubkey_init(ctypes.byref(pubkey))

2448

# Import the raw public key into the certificate

2449

gnutls.pubkey_import(pubkey,

2450

ctypes.byref(datum),

2451

gnutls.X509_FMT_DER)

2452

# New buffer for the key ID

2453

buf = ctypes.create_string_buffer(32)

2454

buf_len = ctypes.c_size_t(len(buf))

2455

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

2456

gnutls.pubkey_get_key_id(pubkey,

2457

gnutls.KEYID_USE_SHA256,

2458

ctypes.cast(ctypes.byref(buf),

2459

ctypes.POINTER(ctypes.c_ubyte)),

2460

ctypes.byref(buf_len))

2461

# Deinit the certificate

2462

gnutls.pubkey_deinit(pubkey)

2463

2464

# Convert the buffer to a Python bytestring

2465

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

2466

# Convert the bytestring to hexadecimal notation

2467

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

2468

return hex_key_id

2469

2470

@staticmethod

2471

def fingerprint(openpgp):

2472

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2473

# New GnuTLS "datum" with the OpenPGP public key

2474

datum = gnutls.datum_t(

2475

ctypes.cast(ctypes.c_char_p(openpgp),

2476

ctypes.POINTER(ctypes.c_ubyte)),

2477

ctypes.c_uint(len(openpgp)))

2478

# New empty GnuTLS certificate

2479

crt = gnutls.openpgp_crt_t()

2480

gnutls.openpgp_crt_init(ctypes.byref(crt))

2481

# Import the OpenPGP public key into the certificate

2482

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

2483

gnutls.OPENPGP_FMT_RAW)

2484

# Verify the self signature in the key

2485

crtverify = ctypes.c_uint()

2486

gnutls.openpgp_crt_verify_self(crt, 0,

2487

ctypes.byref(crtverify))

2488

if crtverify.value != 0:

2489

gnutls.openpgp_crt_deinit(crt)

2490

raise gnutls.CertificateSecurityError(code

2491

=crtverify.value)

2492

# New buffer for the fingerprint

2493

buf = ctypes.create_string_buffer(20)

2494

buf_len = ctypes.c_size_t()

2495

# Get the fingerprint from the certificate into the buffer

2496

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

2497

ctypes.byref(buf_len))

2498

# Deinit the certificate

2499

gnutls.openpgp_crt_deinit(crt)

2500

# Convert the buffer to a Python bytestring

2501

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

2502

# Convert the bytestring to hexadecimal notation

2503

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

2504

return hex_fpr

2505

2506

2507

class MultiprocessingMixIn:

2508

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

2509

2510

def sub_process_main(self, request, address):

2511

try:

2512

self.finish_request(request, address)

2513

except Exception:

2514

self.handle_error(request, address)

2515

self.close_request(request)

2516

2517

def process_request(self, request, address):

2518

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

2519

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

2520

args=(request, address))

2521

proc.start()

2522

return proc

2523

2524

2525

class MultiprocessingMixInWithPipe(MultiprocessingMixIn):

2526

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

2527

2528

def process_request(self, request, client_address):

2529

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

2530

2531

This function creates a new pipe in self.pipe

2532

"""

2533

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2534

2535

proc = MultiprocessingMixIn.process_request(self, request,

2536

client_address)

2537

self.child_pipe.close()

2538

self.add_pipe(parent_pipe, proc)

2539

2540

def add_pipe(self, parent_pipe, proc):

2541

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

2542

raise NotImplementedError()

2543

2544

2545

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2546

socketserver.TCPServer):

2547

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

2548

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.

2549

367

Attributes:

2550

enabled: Boolean; whether this server is activated yet

2551

interface: None or a network interface name (string)

2552

use_ipv6: Boolean; to use IPv6 or not

368

options: Command line options

369

clients: Set() of Client objects

2553

370

"""

2554

2555

def __init__(self, server_address, RequestHandlerClass,

2556

interface=None,

2557

use_ipv6=True,

2558

socketfd=None):

2559

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

2560

creating a new one with socket.socket().

2561

"""

2562

self.interface = interface

2563

if use_ipv6:

2564

self.address_family = socket.AF_INET6

2565

if socketfd is not None:

2566

# Save the file descriptor

2567

self.socketfd = socketfd

2568

# Save the original socket.socket() function

2569

self.socket_socket = socket.socket

2570

2571

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

2572

#

2573

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

2574

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

2575

# patching socket.socket.)

2576

#

2577

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

2578

@functools.wraps(socket.socket)

2579

def socket_wrapper(*args, **kwargs):

2580

# Restore original function so subsequent calls are

2581

# not affected.

2582

socket.socket = self.socket_socket

2583

del self.socket_socket

2584

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

2585

# saved file descriptor.

2586

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

2587

# Replace socket.socket() function with wrapper

2588

socket.socket = socket_wrapper

2589

# The socketserver.TCPServer.__init__ will call

2590

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

2591

# socket_wrapper(), if socketfd was set.

2592

socketserver.TCPServer.__init__(self, server_address,

2593

RequestHandlerClass)

2594

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)

2595

380

def server_bind(self):

2596

381

"""This overrides the normal server_bind() function

2597

382

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

2598

383

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

2599

global SO_BINDTODEVICE

2600

if self.interface is not None:

2601

if SO_BINDTODEVICE is None:

2602

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

2603

# common enough.

2604

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

2605

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

2606

388

try:

2607

self.socket.setsockopt(

2608

socket.SOL_SOCKET, SO_BINDTODEVICE,

2609

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

2610

except socket.error as error:

2611

if error.errno == errno.EPERM:

2612

logger.error("No permission to bind to"

2613

" interface %s", self.interface)

2614

elif error.errno == errno.ENOPROTOOPT:

2615

logger.error("SO_BINDTODEVICE not available;"

2616

" cannot bind to interface %s",

2617

self.interface)

2618

elif error.errno == errno.ENODEV:

2619

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

2620

" 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)

2621

397

else:

2622

raise

398

raise error

2623

399

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

2624

400

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

2625

if self.server_address[1]:

2626

self.allow_reuse_address = True

2627

401

if not self.server_address[0]:

2628

if self.address_family == socket.AF_INET6:

2629

any_address = "::" # in6addr_any

2630

else:

2631

any_address = "0.0.0.0" # INADDR_ANY

2632

self.server_address = (any_address,

402

in6addr_any = "::"

403

self.server_address = (in6addr_any,

2633

404

self.server_address[1])

2634

elif not self.server_address[1]:

2635

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

2636

# if self.interface:

2637

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

2638

# 0, # port

2639

# 0, # flowinfo

2640

# if_nametoindex

2641

# (self.interface))

2642

return socketserver.TCPServer.server_bind(self)

2643

2644

2645

class MandosServer(IPv6_TCPServer):

2646

"""Mandos server.

2647

2648

Attributes:

2649

clients: set of Client objects

2650

gnutls_priority GnuTLS priority string

2651

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

2652

2653

Assumes a GLib.MainLoop event loop.

2654

"""

2655

2656

def __init__(self, server_address, RequestHandlerClass,

2657

interface=None,

2658

use_ipv6=True,

2659

clients=None,

2660

gnutls_priority=None,

2661

use_dbus=True,

2662

socketfd=None):

2663

self.enabled = False

2664

self.clients = clients

2665

if self.clients is None:

2666

self.clients = {}

2667

self.use_dbus = use_dbus

2668

self.gnutls_priority = gnutls_priority

2669

IPv6_TCPServer.__init__(self, server_address,

2670

RequestHandlerClass,

2671

interface=interface,

2672

use_ipv6=use_ipv6,

2673

socketfd=socketfd)

2674

2675

def server_activate(self):

2676

if self.enabled:

2677

return socketserver.TCPServer.server_activate(self)

2678

2679

def enable(self):

2680

self.enabled = True

2681

2682

def add_pipe(self, parent_pipe, proc):

2683

# Call "handle_ipc" for both data and EOF events

2684

GLib.io_add_watch(

2685

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

2686

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

2687

functools.partial(self.handle_ipc,

2688

parent_pipe=parent_pipe,

2689

proc=proc))

2690

2691

def handle_ipc(self, source, condition,

2692

parent_pipe=None,

2693

proc=None,

2694

client_object=None):

2695

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

2696

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

2697

# Wait for other process to exit

2698

proc.join()

2699

return False

2700

2701

# Read a request from the child

2702

request = parent_pipe.recv()

2703

command = request[0]

2704

2705

if command == 'init':

2706

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

2707

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

2708

address = request[3]

2709

2710

for c in self.clients.values():

2711

if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":

2712

continue

2713

if key_id and c.key_id == key_id:

2714

client = c

2715

break

2716

if fpr and c.fingerprint == fpr:

2717

client = c

2718

break

2719

else:

2720

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

2721

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

2722

if self.use_dbus:

2723

# Emit D-Bus signal

2724

mandos_dbus_service.ClientNotFound(key_id or fpr,

2725

address[0])

2726

parent_pipe.send(False)

2727

return False

2728

2729

GLib.io_add_watch(

2730

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

2731

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

2732

functools.partial(self.handle_ipc,

2733

parent_pipe=parent_pipe,

2734

proc=proc,

2735

client_object=client))

2736

parent_pipe.send(True)

2737

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

2738

# same fileno

2739

return False

2740

if command == 'funcall':

2741

funcname = request[1]

2742

args = request[2]

2743

kwargs = request[3]

2744

2745

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

2746

funcname)(*args,

2747

**kwargs)))

2748

2749

if command == 'getattr':

2750

attrname = request[1]

2751

if isinstance(client_object.__getattribute__(attrname),

2752

collections.Callable):

2753

parent_pipe.send(('function', ))

2754

else:

2755

parent_pipe.send((

2756

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

2757

2758

if command == 'setattr':

2759

attrname = request[1]

2760

value = request[2]

2761

setattr(client_object, attrname, value)

2762

2763

return True

2764

2765

2766

def rfc3339_duration_to_delta(duration):

2767

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

2768

2769

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

2770

True

2771

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

2772

True

2773

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

2774

True

2775

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

2776

True

2777

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

2778

True

2779

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

2780

True

2781

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

2782

True

2783

"""

2784

2785

# Parsing an RFC 3339 duration with regular expressions is not

2786

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

2787

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

2788

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

2789

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

2790

# avoid excessive use of external libraries.

2791

2792

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

2793

Token = collections.namedtuple("Token", (

2794

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

2795

# a "group" containing digits

2796

"value", # datetime.timedelta or None

2797

"followers")) # Tokens valid after this token

2798

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

2799

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

2800

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

2801

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

2802

datetime.timedelta(seconds=1),

2803

frozenset((token_end, )))

2804

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

2805

datetime.timedelta(minutes=1),

2806

frozenset((token_second, token_end)))

2807

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

2808

datetime.timedelta(hours=1),

2809

frozenset((token_minute, token_end)))

2810

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

2811

None,

2812

frozenset((token_hour, token_minute,

2813

token_second)))

2814

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

2815

datetime.timedelta(days=1),

2816

frozenset((token_time, token_end)))

2817

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

2818

datetime.timedelta(weeks=4),

2819

frozenset((token_day, token_end)))

2820

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

2821

datetime.timedelta(weeks=52),

2822

frozenset((token_month, token_end)))

2823

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

2824

datetime.timedelta(weeks=1),

2825

frozenset((token_end, )))

2826

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

2827

frozenset((token_year, token_month,

2828

token_day, token_time,

2829

token_week)))

2830

# Define starting values:

2831

# Value so far

2832

value = datetime.timedelta()

2833

found_token = None

2834

# Following valid tokens

2835

followers = frozenset((token_duration, ))

2836

# String left to parse

2837

s = duration

2838

# Loop until end token is found

2839

while found_token is not token_end:

2840

# Search for any currently valid tokens

2841

for token in followers:

2842

match = token.regexp.match(s)

2843

if match is not None:

2844

# Token found

2845

if token.value is not None:

2846

# Value found, parse digits

2847

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

2848

# Add to value so far

2849

value += factor * token.value

2850

# Strip token from string

2851

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

2852

# Go to found token

2853

found_token = token

2854

# Set valid next tokens

2855

followers = found_token.followers

2856

break

2857

else:

2858

# No currently valid tokens were found

2859

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

2860

.format(duration))

2861

# End token found

2862

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()

2863

409

2864

410

2865

411

def string_to_delta(interval):

2866

412

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

2867

413

2868

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

2869

True

2870

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

2871

True

2872

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

2873

True

2874

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

2875

True

2876

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

2877

True

2878

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

2879

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)

2880

424

"""

2881

2882

try:

2883

return rfc3339_duration_to_delta(interval)

2884

except ValueError:

2885

pass

2886

2887

timevalue = datetime.timedelta(0)

2888

for s in interval.split():

2889

try:

2890

suffix = s[-1]

2891

value = int(s[:-1])

2892

if suffix == "d":

2893

delta = datetime.timedelta(value)

2894

elif suffix == "s":

2895

delta = datetime.timedelta(0, value)

2896

elif suffix == "m":

2897

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

2898

elif suffix == "h":

2899

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

2900

elif suffix == "w":

2901

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

2902

else:

2903

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

2904

except IndexError as e:

2905

raise ValueError(*(e.args))

2906

timevalue += delta

2907

return timevalue

2908

2909

2910

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

2911

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

2912

2913

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

2914

if os.fork():

2915

sys.exit()

2916

os.setsid()

2917

if not nochdir:

2918

os.chdir("/")

2919

if os.fork():

2920

sys.exit()

2921

if not noclose:

2922

# Close all standard open file descriptors

2923

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

2924

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

2925

raise OSError(errno.ENODEV,

2926

"{} not a character device"

2927

.format(os.devnull))

2928

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

2929

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

2930

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

2931

if null > 2:

2932

os.close(null)

2933

2934

2935

def main():

2936

2937

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

2938

# Parsing of options, both command line and config file

2939

2940

parser = argparse.ArgumentParser()

2941

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

2942

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

2943

help="show version number and exit")

2944

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

2945

help="Bind to interface IF")

2946

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

2947

help="Address to listen for requests on")

2948

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

2949

help="Port number to receive requests on")

2950

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

2951

help="Run self-test")

2952

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

2953

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

2954

" to terminal", default=None)

2955

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

2956

help="Debug level for stdout output")

2957

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

2958

" priority string (see GnuTLS documentation)")

2959

parser.add_argument("--servicename",

2960

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

2961

parser.add_argument("--configdir",

2962

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

2963

help="Directory to search for configuration"

2964

" files")

2965

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

2966

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

2967

" system bus interface", default=None)

2968

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

2969

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

2970

default=None)

2971

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

2972

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

2973

" state", default=None)

2974

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

2975

help="Specify a file descriptor to a network"

2976

" socket to use instead of creating one")

2977

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

2978

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

2979

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

2980

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

2981

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

2982

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

2983

default=None)

2984

2985

options = parser.parse_args()

2986

2987

# Default values for config file for server-global settings

2988

if gnutls.has_rawpk:

2989

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

2990

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

2991

else:

2992

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

2993

":+SIGN-DSA-SHA256")

2994

server_defaults = {"interface": "",

2995

"address": "",

2996

"port": "",

2997

"debug": "False",

2998

"priority": priority,

2999

"servicename": "Mandos",

3000

"use_dbus": "True",

3001

"use_ipv6": "True",

3002

"debuglevel": "",

3003

"restore": "True",

3004

"socket": "",

3005

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

3006

"foreground": "False",

3007

"zeroconf": "True",

3008

}

3009

del priority

3010

3011

# Parse config file for server-global settings

3012

server_config = configparser.ConfigParser(server_defaults)

3013

del server_defaults

3014

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

3015

# Convert the ConfigParser object to a dict

3016

server_settings = server_config.defaults()

3017

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

3018

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

3019

"foreground", "zeroconf"):

3020

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

3021

option)

3022

if server_settings["port"]:

3023

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

3024

"port")

3025

if server_settings["socket"]:

3026

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

3027

"socket")

3028

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

3029

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

3030

# happen with a supplied network socket.

3031

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

3032

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

3033

["socket"])

3034

del server_config

3035

3036

# Override the settings from the config file with command line

3037

# options, if set.

3038

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

3039

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

3040

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

3041

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

3042

value = getattr(options, option)

3043

if value is not None:

3044

server_settings[option] = value

3045

del options

3046

# Force all strings to be unicode

3047

for option in server_settings.keys():

3048

if isinstance(server_settings[option], bytes):

3049

server_settings[option] = (server_settings[option]

3050

.decode("utf-8"))

3051

# Force all boolean options to be boolean

3052

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

3053

"foreground", "zeroconf"):

3054

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

3055

# Debug implies foreground

3056

if server_settings["debug"]:

3057

server_settings["foreground"] = True

3058

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

3059

3060

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

3061

3062

if (not server_settings["zeroconf"]

3063

and not (server_settings["port"]

3064

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

3065

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

3066

3067

# For convenience

3068

debug = server_settings["debug"]

3069

debuglevel = server_settings["debuglevel"]

3070

use_dbus = server_settings["use_dbus"]

3071

use_ipv6 = server_settings["use_ipv6"]

3072

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

3073

stored_state_file)

3074

foreground = server_settings["foreground"]

3075

zeroconf = server_settings["zeroconf"]

3076

3077

if debug:

3078

initlogger(debug, logging.DEBUG)

3079

else:

3080

if not debuglevel:

3081

initlogger(debug)

3082

else:

3083

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

3084

initlogger(debug, level)

3085

3086

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

3087

syslogger.setFormatter(

3088

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

3089

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

3090

server_settings["servicename"])))

3091

3092

# Parse config file with clients

3093

client_config = configparser.ConfigParser(Client.client_defaults)

3094

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

3095

"clients.conf"))

3096

3097

global mandos_dbus_service

3098

mandos_dbus_service = None

3099

3100

socketfd = None

3101

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

3102

socketfd = server_settings["socket"]

3103

tcp_server = MandosServer(

3104

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

3105

ClientHandler,

3106

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

3107

use_ipv6=use_ipv6,

3108

gnutls_priority=server_settings["priority"],

3109

use_dbus=use_dbus,

3110

socketfd=socketfd)

3111

if not foreground:

3112

pidfilename = "/run/mandos.pid"

3113

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

3114

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

3115

pidfile = None

3116

try:

3117

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

3118

except IOError as e:

3119

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

3120

exc_info=e)

3121

3122

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

3123

("mandos", "mandos"),

3124

("nobody", "nogroup")):

3125

try:

3126

uid = pwd.getpwnam(name).pw_uid

3127

gid = pwd.getpwnam(group).pw_gid

3128

break

3129

except KeyError:

3130

continue

3131

else:

3132

uid = 65534

3133

gid = 65534

3134

try:

3135

os.setgid(gid)

3136

os.setuid(uid)

3137

if debug:

3138

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

3139

gid))

3140

except OSError as error:

3141

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

3142

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

3143

if error.errno != errno.EPERM:

3144

raise

3145

3146

if debug:

3147

# Enable all possible GnuTLS debugging

3148

3149

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

3150

# - GnuTLS manual

3151

gnutls.global_set_log_level(11)

3152

3153

@gnutls.log_func

3154

def debug_gnutls(level, string):

3155

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

3156

3157

gnutls.global_set_log_function(debug_gnutls)

3158

3159

# Redirect stdin so all checkers get /dev/null

3160

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

3161

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

3162

if null > 2:

3163

os.close(null)

3164

3165

# Need to fork before connecting to D-Bus

3166

if not foreground:

3167

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

3168

daemon()

3169

3170

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

3171

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

3172

# need to inform GLib that threads will be used.

3173

GLib.threads_init()

3174

3175

global main_loop

3176

# From the Avahi example code

3177

DBusGMainLoop(set_as_default=True)

3178

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()

3179

591

bus = dbus.SystemBus()

3180

# End of Avahi example code

3181

if use_dbus:

3182

try:

3183

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

3184

bus,

3185

do_not_queue=True)

3186

old_bus_name = dbus.service.BusName(

3187

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

3188

do_not_queue=True)

3189

except dbus.exceptions.DBusException as e:

3190

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

3191

use_dbus = False

3192

server_settings["use_dbus"] = False

3193

tcp_server.use_dbus = False

3194

if zeroconf:

3195

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3196

service = AvahiServiceToSyslog(

3197

name=server_settings["servicename"],

3198

servicetype="_mandos._tcp",

3199

protocol=protocol,

3200

bus=bus)

3201

if server_settings["interface"]:

3202

service.interface = if_nametoindex(

3203

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

3204

3205

global multiprocessing_manager

3206

multiprocessing_manager = multiprocessing.Manager()

3207

3208

client_class = Client

3209

if use_dbus:

3210

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

3211

3212

client_settings = Client.config_parser(client_config)

3213

old_client_settings = {}

3214

clients_data = {}

3215

3216

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

3217

global wnull

3218

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

3219

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

3220

# mode

3221

if debug or not foreground:

3222

wnull.close()

3223

3224

# Get client data and settings from last running state.

3225

if server_settings["restore"]:

3226

try:

3227

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

3228

if sys.version_info.major == 2:

3229

clients_data, old_client_settings = pickle.load(

3230

stored_state)

3231

else:

3232

bytes_clients_data, bytes_old_client_settings = (

3233

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

3234

# Fix bytes to strings

3235

# clients_data

3236

# .keys()

3237

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

3238

if isinstance(key, bytes)

3239

else key): value

3240

for key, value in

3241

bytes_clients_data.items()}

3242

del bytes_clients_data

3243

for key in clients_data:

3244

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

3245

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

3246

for k, v in

3247

clients_data[key].items()}

3248

clients_data[key] = value

3249

# .client_structure

3250

value["client_structure"] = [

3251

(s.decode("utf-8")

3252

if isinstance(s, bytes)

3253

else s) for s in

3254

value["client_structure"]]

3255

# .name, .host, and .checker_command

3256

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

3257

if isinstance(value[k], bytes):

3258

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

3259

if "key_id" not in value:

3260

value["key_id"] = ""

3261

elif "fingerprint" not in value:

3262

value["fingerprint"] = ""

3263

# old_client_settings

3264

# .keys()

3265

old_client_settings = {

3266

(key.decode("utf-8")

3267

if isinstance(key, bytes)

3268

else key): value

3269

for key, value in

3270

bytes_old_client_settings.items()}

3271

del bytes_old_client_settings

3272

# .host and .checker_command

3273

for value in old_client_settings.values():

3274

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

3275

if isinstance(value[attribute], bytes):

3276

value[attribute] = (value[attribute]

3277

.decode("utf-8"))

3278

os.remove(stored_state_path)

3279

except IOError as e:

3280

if e.errno == errno.ENOENT:

3281

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

3282

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

3283

else:

3284

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

3285

exc_info=e)

3286

raise

3287

except EOFError as e:

3288

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

3289

"EOFError:",

3290

exc_info=e)

3291

3292

with PGPEngine() as pgp:

3293

for client_name, client in clients_data.items():

3294

# Skip removed clients

3295

if client_name not in client_settings:

3296

continue

3297

3298

# Decide which value to use after restoring saved state.

3299

# We have three different values: Old config file,

3300

# new config file, and saved state.

3301

# New config value takes precedence if it differs from old

3302

# config value, otherwise use saved state.

3303

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

3304

try:

3305

# For each value in new config, check if it

3306

# differs from the old config value (Except for

3307

# the "secret" attribute)

3308

if (name != "secret"

3309

and (value !=

3310

old_client_settings[client_name][name])):

3311

client[name] = value

3312

except KeyError:

3313

pass

3314

3315

# Clients who has passed its expire date can still be

3316

# enabled if its last checker was successful. A Client

3317

# whose checker succeeded before we stored its state is

3318

# assumed to have successfully run all checkers during

3319

# downtime.

3320

if client["enabled"]:

3321

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

3322

if not client["last_checked_ok"]:

3323

logger.warning(

3324

"disabling client {} - Client never "

3325

"performed a successful checker".format(

3326

client_name))

3327

client["enabled"] = False

3328

elif client["last_checker_status"] != 0:

3329

logger.warning(

3330

"disabling client {} - Client last"

3331

" checker failed with error code"

3332

" {}".format(

3333

client_name,

3334

client["last_checker_status"]))

3335

client["enabled"] = False

3336

else:

3337

client["expires"] = (

3338

datetime.datetime.utcnow()

3339

+ client["timeout"])

3340

logger.debug("Last checker succeeded,"

3341

" keeping {} enabled".format(

3342

client_name))

3343

try:

3344

client["secret"] = pgp.decrypt(

3345

client["encrypted_secret"],

3346

client_settings[client_name]["secret"])

3347

except PGPError:

3348

# If decryption fails, we use secret from new settings

3349

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

3350

client_name))

3351

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

3352

["secret"])

3353

3354

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

3355

for client_name in (set(old_client_settings)

3356

- set(client_settings)):

3357

del clients_data[client_name]

3358

for client_name in (set(client_settings)

3359

- set(old_client_settings)):

3360

clients_data[client_name] = client_settings[client_name]

3361

3362

# Create all client objects

3363

for client_name, client in clients_data.items():

3364

tcp_server.clients[client_name] = client_class(

3365

name=client_name,

3366

settings=client,

3367

server_settings=server_settings)

3368

3369

if not tcp_server.clients:

3370

logger.warning("No clients defined")

3371

3372

if not foreground:

3373

if pidfile is not None:

3374

pid = os.getpid()

3375

try:

3376

with pidfile:

3377

print(pid, file=pidfile)

3378

except IOError:

3379

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

3380

pidfilename, pid)

3381

del pidfile

3382

del pidfilename

3383

3384

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

3385

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3386

lambda: main_loop.quit() and False)

3387

3388

if use_dbus:

3389

3390

@alternate_dbus_interfaces(

3391

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

3392

class MandosDBusService(DBusObjectWithObjectManager):

3393

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

3394

3395

def __init__(self):

3396

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

3397

3398

_interface = "se.recompile.Mandos"

3399

3400

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

3401

def ClientAdded(self, objpath):

3402

"D-Bus signal"

3403

pass

3404

3405

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

3406

def ClientNotFound(self, key_id, address):

3407

"D-Bus signal"

3408

pass

3409

3410

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

3411

"true"})

3412

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

3413

def ClientRemoved(self, objpath, name):

3414

"D-Bus signal"

3415

pass

3416

3417

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

3418

"true"})

3419

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

3420

def GetAllClients(self):

3421

"D-Bus method"

3422

return dbus.Array(c.dbus_object_path for c in

3423

tcp_server.clients.values())

3424

3425

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

3426

"true"})

3427

@dbus.service.method(_interface,

3428

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

3429

def GetAllClientsWithProperties(self):

3430

"D-Bus method"

3431

return dbus.Dictionary(

3432

{c.dbus_object_path: c.GetAll(

3433

"se.recompile.Mandos.Client")

3434

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

3435

signature="oa{sv}")

3436

3437

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

3438

def RemoveClient(self, object_path):

3439

"D-Bus method"

3440

for c in tcp_server.clients.values():

3441

if c.dbus_object_path == object_path:

3442

del tcp_server.clients[c.name]

3443

c.remove_from_connection()

3444

# Don't signal the disabling

3445

c.disable(quiet=True)

3446

# Emit D-Bus signal for removal

3447

self.client_removed_signal(c)

3448

return

3449

raise KeyError(object_path)

3450

3451

del _interface

3452

3453

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3454

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

3455

def GetManagedObjects(self):

3456

"""D-Bus method"""

3457

return dbus.Dictionary(

3458

{client.dbus_object_path:

3459

dbus.Dictionary(

3460

{interface: client.GetAll(interface)

3461

for interface in

3462

client._get_all_interface_names()})

3463

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

3464

3465

def client_added_signal(self, client):

3466

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

3467

if use_dbus:

3468

# New standard signal

3469

self.InterfacesAdded(

3470

client.dbus_object_path,

3471

dbus.Dictionary(

3472

{interface: client.GetAll(interface)

3473

for interface in

3474

client._get_all_interface_names()}))

3475

# Old signal

3476

self.ClientAdded(client.dbus_object_path)

3477

3478

def client_removed_signal(self, client):

3479

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

3480

if use_dbus:

3481

# New standard signal

3482

self.InterfacesRemoved(

3483

client.dbus_object_path,

3484

client._get_all_interface_names())

3485

# Old signal

3486

self.ClientRemoved(client.dbus_object_path,

3487

client.name)

3488

3489

mandos_dbus_service = MandosDBusService()

3490

3491

# Save modules to variables to exempt the modules from being

3492

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

3493

mp = multiprocessing

3494

wn = wnull

3495

3496

def cleanup():

3497

"Cleanup function; run on exit"

3498

if zeroconf:

3499

service.cleanup()

3500

3501

mp.active_children()

3502

wn.close()

3503

if not (tcp_server.clients or client_settings):

3504

return

3505

3506

# Store client before exiting. Secrets are encrypted with key

3507

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

3508

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

3509

clients = {}

3510

with PGPEngine() as pgp:

3511

for client in tcp_server.clients.values():

3512

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

3513

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

3514

key)

3515

client_dict = {}

3516

3517

# A list of attributes that can not be pickled

3518

# + secret.

3519

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

3520

"checker", "server_settings"}

3521

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

3522

.Object):

3523

exclude.add(name)

3524

3525

client_dict["encrypted_secret"] = (client

3526

.encrypted_secret)

3527

for attr in client.client_structure:

3528

if attr not in exclude:

3529

client_dict[attr] = getattr(client, attr)

3530

3531

clients[client.name] = client_dict

3532

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

3533

3534

try:

3535

with tempfile.NamedTemporaryFile(

3536

mode='wb',

3537

suffix=".pickle",

3538

prefix='clients-',

3539

dir=os.path.dirname(stored_state_path),

3540

delete=False) as stored_state:

3541

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

3542

protocol=2)

3543

tempname = stored_state.name

3544

os.rename(tempname, stored_state_path)

3545

except (IOError, OSError) as e:

3546

if not debug:

3547

try:

3548

os.remove(tempname)

3549

except NameError:

3550

pass

3551

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

3552

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

3553

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

3554

else:

3555

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

3556

exc_info=e)

3557

raise

3558

3559

# Delete all clients, and settings from config

3560

while tcp_server.clients:

3561

name, client = tcp_server.clients.popitem()

3562

if use_dbus:

3563

client.remove_from_connection()

3564

# Don't signal the disabling

3565

client.disable(quiet=True)

3566

# Emit D-Bus signal for removal

3567

if use_dbus:

3568

mandos_dbus_service.client_removed_signal(client)

3569

client_settings.clear()

3570

3571

atexit.register(cleanup)

3572

3573

for client in tcp_server.clients.values():

3574

if use_dbus:

3575

# Emit D-Bus signal for adding

3576

mandos_dbus_service.client_added_signal(client)

3577

# Need to initiate checking of clients

3578

if client.enabled:

3579

client.init_checker()

3580

3581

tcp_server.enable()

3582

tcp_server.server_activate()

3583

3584

# Find out what port we got

3585

if zeroconf:

3586

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

3587

if use_ipv6:

3588

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

3589

" flowinfo %d, scope_id %d",

3590

*tcp_server.socket.getsockname())

3591

else: # IPv4

3592

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

3593

*tcp_server.socket.getsockname())

3594

3595

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

3596

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)

3597

634

try:

3598

if zeroconf:

3599

# From the Avahi example code

3600

try:

3601

service.activate()

3602

except dbus.exceptions.DBusException as error:

3603

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

3604

cleanup()

3605

sys.exit(1)

3606

# End of Avahi example code

3607

3608

GLib.io_add_watch(

3609

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

3610

GLib.PRIORITY_DEFAULT, GLib.IO_IN,

3611

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

3612

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

3613

3614

logger.debug("Starting main loop")

3615

635

main_loop.run()

3616

except AvahiError as error:

3617

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

3618

cleanup()

3619

sys.exit(1)

3620

636

except KeyboardInterrupt:

3621

if debug:

3622

print("", file=sys.stderr)

3623

logger.debug("Server received KeyboardInterrupt")

3624

logger.debug("Server exiting")

3625

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

3626

cleanup()

3627

3628

3629

def should_only_run_tests():

3630

parser = argparse.ArgumentParser(add_help=False)

3631

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

3632

args, unknown_args = parser.parse_known_args()

3633

run_tests = args.check

3634

if run_tests:

3635

# Remove --check argument from sys.argv

3636

sys.argv[1:] = unknown_args

3637

return run_tests

3638

3639

# Add all tests from doctest strings

3640

def load_tests(loader, tests, none):

3641

import doctest

3642

tests.addTests(doctest.DocTestSuite())

3643

return tests

3644

3645

if __name__ == '__main__':

3646

try:

3647

if should_only_run_tests():

3648

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

3649

unittest.main()

3650

else:

3651

main()

3652

finally:

3653

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()