/mandos/release : revision 237.16.24

11

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

12

#

13

# Everything else is

14

15

14

15

16

#

17

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

18

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

34

from __future__ import (division, absolute_import, print_function,

35

unicode_literals)

36

37

from future_builtins import *

38

39

37

import SocketServer as socketserver

40

38

import socket

41

39

import argparse

65

63

import cPickle as pickle

66

64

import multiprocessing

67

65

import types

68

import binascii

69

import tempfile

70

import itertools

71

import collections

72

66

73

67

import dbus

74

68

import dbus.service

88

82

except ImportError:

89

83

SO_BINDTODEVICE = None

90

84

91

version = "1.6.4"

92

stored_state_file = "clients.pickle"

93

94

logger = logging.getLogger()

95

syslogger = None

96

97

try:

98

if_nametoindex = (ctypes.cdll.LoadLibrary

99

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

100

.if_nametoindex)

101

except (OSError, AttributeError):

102

def if_nametoindex(interface):

103

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

104

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

105

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

106

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

107

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

108

interface))

109

interface_index = struct.unpack(str("I"),

110

ifreq[16:20])[0]

111

return interface_index

112

113

114

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

115

"""init logger and add loglevel"""

116

117

syslogger = (logging.handlers.SysLogHandler

118

(facility =

119

logging.handlers.SysLogHandler.LOG_DAEMON,

120

address = str("/dev/log")))

121

syslogger.setFormatter(logging.Formatter

122

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

123

' %(message)s'))

124

logger.addHandler(syslogger)

125

126

if debug:

127

console = logging.StreamHandler()

128

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

129

' [%(process)d]:'

130

' %(levelname)s:'

131

' %(message)s'))

132

logger.addHandler(console)

133

logger.setLevel(level)

134

135

136

class PGPError(Exception):

137

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

138

pass

139

140

141

class PGPEngine(object):

142

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

143

def __init__(self):

144

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

145

self.gnupgargs = ['--batch',

146

'--home', self.tempdir,

147

'--force-mdc',

148

'--quiet',

149

'--no-use-agent']

150

151

def __enter__(self):

152

return self

153

154

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

155

self._cleanup()

156

return False

157

158

def __del__(self):

159

self._cleanup()

160

161

def _cleanup(self):

162

if self.tempdir is not None:

163

# Delete contents of tempdir

164

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

165

topdown = False):

166

for filename in files:

167

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

168

for dirname in dirs:

169

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

170

# Remove tempdir

171

os.rmdir(self.tempdir)

172

self.tempdir = None

173

174

def password_encode(self, password):

175

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

176

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

177

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

178

if len(encoded) > 2048:

179

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

180

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

181

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

182

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

183

return encoded

184

185

def encrypt(self, data, password):

186

passphrase = self.password_encode(password)

187

with tempfile.NamedTemporaryFile(dir=self.tempdir

188

) as passfile:

189

passfile.write(passphrase)

190

passfile.flush()

191

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

192

'--passphrase-file',

193

passfile.name]

194

+ self.gnupgargs,

195

stdin = subprocess.PIPE,

196

stdout = subprocess.PIPE,

197

stderr = subprocess.PIPE)

198

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

199

if proc.returncode != 0:

200

raise PGPError(err)

201

return ciphertext

202

203

def decrypt(self, data, password):

204

passphrase = self.password_encode(password)

205

with tempfile.NamedTemporaryFile(dir = self.tempdir

206

) as passfile:

207

passfile.write(passphrase)

208

passfile.flush()

209

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

210

'--passphrase-file',

211

passfile.name]

212

+ self.gnupgargs,

213

stdin = subprocess.PIPE,

214

stdout = subprocess.PIPE,

215

stderr = subprocess.PIPE)

216

decrypted_plaintext, err = proc.communicate(input

217

= data)

218

if proc.returncode != 0:

219

raise PGPError(err)

220

return decrypted_plaintext

221

85

86

version = "1.4.1"

87

88

#logger = logging.getLogger('mandos')

89

logger = logging.Logger('mandos')

90

syslogger = (logging.handlers.SysLogHandler

91

(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

92

address = str("/dev/log")))

93

syslogger.setFormatter(logging.Formatter

94

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

95

' %(message)s'))

96

logger.addHandler(syslogger)

97

98

console = logging.StreamHandler()

99

console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'

100

' %(levelname)s:'

101

' %(message)s'))

102

logger.addHandler(console)

222

103

223

104

class AvahiError(Exception):

224

105

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

242

123

Used to optionally bind to the specified interface.

243

124

name: string; Example: 'Mandos'

244

125

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

245

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

126

See <http://www.dns-sd.org/ServiceTypes.html>

246

127

port: integer; what port to announce

247

128

TXT: list of strings; TXT record for the service

248

129

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

254

135

server: D-Bus Server

255

136

bus: dbus.SystemBus()

256

137

"""

257

258

138

def __init__(self, interface = avahi.IF_UNSPEC, name = None,

259

139

servicetype = None, port = None, TXT = None,

260

140

domain = "", host = "", max_renames = 32768,

273

153

self.server = None

274

154

self.bus = bus

275

155

self.entry_group_state_changed_match = None

276

277

156

def rename(self):

278

157

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

279

158

if self.rename_count >= self.max_renames:

285

164

.GetAlternativeServiceName(self.name))

286

165

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

287

166

self.name)

167

syslogger.setFormatter(logging.Formatter

168

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

169

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

170

% self.name))

288

171

self.remove()

289

172

try:

290

173

self.add()

291

174

except dbus.exceptions.DBusException as error:

292

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

175

logger.critical("DBusException: %s", error)

293

176

self.cleanup()

294

177

os._exit(1)

295

178

self.rename_count += 1

296

297

179

def remove(self):

298

180

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

299

181

if self.entry_group_state_changed_match is not None:

301

183

self.entry_group_state_changed_match = None

302

184

if self.group is not None:

303

185

self.group.Reset()

304

305

186

def add(self):

306

187

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

307

188

self.remove()

312

193

avahi.DBUS_INTERFACE_ENTRY_GROUP)

313

194

self.entry_group_state_changed_match = (

314

195

self.group.connect_to_signal(

315

'StateChanged', self.entry_group_state_changed))

196

'StateChanged', self .entry_group_state_changed))

316

197

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

317

198

self.name, self.type)

318

199

self.group.AddService(

324

205

dbus.UInt16(self.port),

325

206

avahi.string_array_to_txt_array(self.TXT))

326

207

self.group.Commit()

327

328

208

def entry_group_state_changed(self, state, error):

329

209

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

330

210

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

337

217

elif state == avahi.ENTRY_GROUP_FAILURE:

338

218

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

339

219

unicode(error))

340

raise AvahiGroupError("State changed: {0!s}"

341

.format(error))

342

220

raise AvahiGroupError("State changed: %s"

221

% unicode(error))

343

222

def cleanup(self):

344

223

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

345

224

if self.group is not None:

346

225

try:

347

226

self.group.Free()

348

227

except (dbus.exceptions.UnknownMethodException,

349

dbus.exceptions.DBusException):

228

dbus.exceptions.DBusException) as e:

350

229

pass

351

230

self.group = None

352

231

self.remove()

353

354

232

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

355

233

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

356

234

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

375

253

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

376

254

else:

377

255

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

378

379

256

def activate(self):

380

257

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

381

258

if self.server is None:

389

266

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

390

267

391

268

392

class AvahiServiceToSyslog(AvahiService):

393

def rename(self):

394

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

395

ret = AvahiService.rename(self)

396

syslogger.setFormatter(logging.Formatter

397

('Mandos ({0}) [%(process)d]:'

398

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

399

.format(self.name)))

400

return ret

401

402

403

def timedelta_to_milliseconds(td):

269

def _timedelta_to_milliseconds(td):

404

270

"Convert a datetime.timedelta() to milliseconds"

405

271

return ((td.days * 24 * 60 * 60 * 1000)

406

272

+ (td.seconds * 1000)

407

273

+ (td.microseconds // 1000))

408

409

274

410

275

class Client(object):

411

276

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

412

277

413

278

Attributes:

414

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

279

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

415

280

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

416

281

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

417

282

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

424

289

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

425

290

checker_initiator_tag: a gobject event source tag, or None

426

291

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

427

client_structure: Object describing what attributes a client has

428

and is used for storing the client at exit

429

292

current_checker_command: string; current running checker_command

293

disable_hook: If set, called by disable() as disable_hook(self)

430

294

disable_initiator_tag: a gobject event source tag, or None

431

295

enabled: bool()

432

296

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

435

299

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

436

300

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

437

301

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

438

last_checker_status: integer between 0 and 255 reflecting exit

439

status of last checker. -1 reflects crashed

440

checker, -2 means no checker completed yet.

441

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

302

last_enabled: datetime.datetime(); (UTC)

442

303

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

443

304

D-Bus identifiers

444

305

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

445

306

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

446

307

until this client is disabled

447

extended_timeout: extra long timeout when secret has been sent

308

extended_timeout: extra long timeout when password has been sent

448

309

runtime_expansions: Allowed attributes for runtime expansion.

449

310

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

450

311

disabled, or None

451

server_settings: The server_settings dict from main()

452

312

"""

453

313

454

314

runtime_expansions = ("approval_delay", "approval_duration",

455

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

456

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

457

"last_approval_request", "last_checked_ok",

315

"created", "enabled", "fingerprint",

316

"host", "interval", "last_checked_ok",

458

317

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

459

client_defaults = { "timeout": "PT5M",

460

"extended_timeout": "PT15M",

461

"interval": "PT2M",

462

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

463

"host": "",

464

"approval_delay": "PT0S",

465

"approval_duration": "PT1S",

466

"approved_by_default": "True",

467

"enabled": "True",

468

}

469

318

470

319

def timeout_milliseconds(self):

471

320

"Return the 'timeout' attribute in milliseconds"

472

return timedelta_to_milliseconds(self.timeout)

321

return _timedelta_to_milliseconds(self.timeout)

473

322

474

323

def extended_timeout_milliseconds(self):

475

324

"Return the 'extended_timeout' attribute in milliseconds"

476

return timedelta_to_milliseconds(self.extended_timeout)

325

return _timedelta_to_milliseconds(self.extended_timeout)

477

326

478

327

def interval_milliseconds(self):

479

328

"Return the 'interval' attribute in milliseconds"

480

return timedelta_to_milliseconds(self.interval)

329

return _timedelta_to_milliseconds(self.interval)

481

330

482

331

def approval_delay_milliseconds(self):

483

return timedelta_to_milliseconds(self.approval_delay)

484

485

@staticmethod

486

def config_parser(config):

487

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

488

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

489

with exceptions for any special settings as defined above.

490

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

491

value given the same arguments.

492

"""

493

settings = {}

494

for client_name in config.sections():

495

section = dict(config.items(client_name))

496

client = settings[client_name] = {}

497

498

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

499

# Reformat values from string types to Python types

500

client["approved_by_default"] = config.getboolean(

501

client_name, "approved_by_default")

502

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

503

"enabled")

504

505

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

506

.replace(" ", ""))

507

if "secret" in section:

508

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

509

elif "secfile" in section:

510

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

511

(section["secfile"])),

512

"rb") as secfile:

513

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

514

else:

515

raise TypeError("No secret or secfile for section {0}"

516

.format(section))

517

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

518

client["extended_timeout"] = string_to_delta(

519

section["extended_timeout"])

520

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

521

client["approval_delay"] = string_to_delta(

522

section["approval_delay"])

523

client["approval_duration"] = string_to_delta(

524

section["approval_duration"])

525

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

526

client["last_approval_request"] = None

527

client["last_checked_ok"] = None

528

client["last_checker_status"] = -2

529

530

return settings

531

532

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

332

return _timedelta_to_milliseconds(self.approval_delay)

333

334

def __init__(self, name = None, disable_hook=None, config=None):

335

"""Note: the 'checker' key in 'config' sets the

336

'checker_command' attribute and *not* the 'checker'

337

attribute."""

533

338

self.name = name

534

if server_settings is None:

535

server_settings = {}

536

self.server_settings = server_settings

537

# adding all client settings

538

for setting, value in settings.iteritems():

539

setattr(self, setting, value)

540

541

if self.enabled:

542

if not hasattr(self, "last_enabled"):

543

self.last_enabled = datetime.datetime.utcnow()

544

if not hasattr(self, "expires"):

545

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

546

+ self.timeout)

547

else:

548

self.last_enabled = None

549

self.expires = None

550

339

if config is None:

340

config = {}

551

341

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

552

342

# Uppercase and remove spaces from fingerprint for later

553

343

# comparison purposes with return value from the fingerprint()

554

344

# function

345

self.fingerprint = (config["fingerprint"].upper()

346

.replace(" ", ""))

555

347

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

556

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

557

datetime.datetime.utcnow())

558

559

# attributes specific for this server instance

348

if "secret" in config:

349

self.secret = config["secret"].decode("base64")

350

elif "secfile" in config:

351

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

352

(config["secfile"])),

353

"rb") as secfile:

354

self.secret = secfile.read()

355

else:

356

raise TypeError("No secret or secfile for client %s"

357

% self.name)

358

self.host = config.get("host", "")

359

self.created = datetime.datetime.utcnow()

360

self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

364

self.timeout = string_to_delta(config["timeout"])

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

self.interval = string_to_delta(config["interval"])

368

self.disable_hook = disable_hook

560

369

self.checker = None

561

370

self.checker_initiator_tag = None

562

371

self.disable_initiator_tag = None

372

self.expires = None

563

373

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

564

375

self.current_checker_command = None

565

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

self.approved_by_default = config.get("approved_by_default",

379

True)

566

380

self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

384

config["approval_duration"])

567

385

self.changedstate = (multiprocessing_manager

568

386

.Condition(multiprocessing_manager

569

387

.Lock()))

570

self.client_structure = [attr for attr in

571

self.__dict__.iterkeys()

572

if not attr.startswith("_")]

573

self.client_structure.append("client_structure")

574

575

for name, t in inspect.getmembers(type(self),

576

lambda obj:

577

isinstance(obj,

578

property)):

579

if not name.startswith("_"):

580

self.client_structure.append(name)

581

388

582

# Send notice to process children that client state has changed

583

389

def send_changedstate(self):

584

with self.changedstate:

585

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

586

393

587

394

def enable(self):

588

395

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

589

396

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

590

397

# Already enabled

591

398

return

592

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

593

self.enabled = True

594

self.last_enabled = datetime.datetime.utcnow()

595

self.init_checker()

596

399

self.send_changedstate()

597

598

def disable(self, quiet=True):

599

"""Disable this client."""

600

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

601

return False

602

if not quiet:

603

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

604

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

605

gobject.source_remove(self.disable_initiator_tag)

606

self.disable_initiator_tag = None

607

self.expires = None

608

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

609

gobject.source_remove(self.checker_initiator_tag)

610

self.checker_initiator_tag = None

611

self.stop_checker()

612

self.enabled = False

613

if not quiet:

614

self.send_changedstate()

615

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

616

return False

617

618

def __del__(self):

619

self.disable()

620

621

def init_checker(self):

622

400

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

623

401

# and every interval from then on.

624

if self.checker_initiator_tag is not None:

625

gobject.source_remove(self.checker_initiator_tag)

626

402

self.checker_initiator_tag = (gobject.timeout_add

627

403

(self.interval_milliseconds(),

628

404

self.start_checker))

629

405

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

630

if self.disable_initiator_tag is not None:

631

gobject.source_remove(self.disable_initiator_tag)

406

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

632

407

self.disable_initiator_tag = (gobject.timeout_add

633

408

(self.timeout_milliseconds(),

634

409

self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

635

412

# Also start a new checker *right now*.

636

413

self.start_checker()

637

414

415

def disable(self, quiet=True):

416

"""Disable this client."""

417

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

418

return False

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

422

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

423

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

424

gobject.source_remove(self.disable_initiator_tag)

425

self.disable_initiator_tag = None

426

self.expires = None

427

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

428

gobject.source_remove(self.checker_initiator_tag)

429

self.checker_initiator_tag = None

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

self.enabled = False

434

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

435

return False

436

437

def __del__(self):

438

self.disable_hook = None

439

self.disable()

440

638

441

def checker_callback(self, pid, condition, command):

639

442

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

640

443

self.checker_callback_tag = None

641

444

self.checker = None

642

445

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

644

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

645

448

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

646

449

vars(self))

647

450

self.checked_ok()

649

452

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

650

453

vars(self))

651

454

else:

652

self.last_checker_status = -1

653

455

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

654

456

vars(self))

655

457

656

def checked_ok(self):

657

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

658

self.last_checked_ok = datetime.datetime.utcnow()

659

self.last_checker_status = 0

660

self.bump_timeout()

661

662

def bump_timeout(self, timeout=None):

663

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

458

def checked_ok(self, timeout=None):

459

"""Bump up the timeout for this client.

460

461

This should only be called when the client has been seen,

462

alive and well.

463

"""

664

464

if timeout is None:

665

465

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

666

467

if self.disable_initiator_tag is not None:

667

468

gobject.source_remove(self.disable_initiator_tag)

668

self.disable_initiator_tag = None

669

469

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

670

470

self.disable_initiator_tag = (gobject.timeout_add

671

(timedelta_to_milliseconds

471

(_timedelta_to_milliseconds

672

472

(timeout), self.disable))

673

473

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

674

474

681

481

If a checker already exists, leave it running and do

682

482

nothing."""

683

483

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

684

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

685

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

686

# would inevitably timeout, since no checker would get a

687

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

484

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

485

# running slowly and taking more than 'interval' time, the

486

# client would inevitably timeout, since no checker would get

487

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

688

488

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

689

489

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

690

490

# should be.

692

492

# If a checker exists, make sure it is not a zombie

693

493

try:

694

494

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

695

except AttributeError:

696

pass

697

except OSError as error:

698

if error.errno != errno.ECHILD:

699

raise

495

except (AttributeError, OSError) as error:

496

if (isinstance(error, OSError)

497

and error.errno != errno.ECHILD):

498

raise error

700

499

else:

701

500

if pid:

702

501

logger.warning("Checker was a zombie")

705

504

self.current_checker_command)

706

505

# Start a new checker if needed

707

506

if self.checker is None:

708

# Escape attributes for the shell

709

escaped_attrs = dict(

710

(attr, re.escape(unicode(getattr(self, attr))))

711

for attr in

712

self.runtime_expansions)

713

507

try:

714

command = self.checker_command % escaped_attrs

715

except TypeError as error:

716

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

717

self.checker_command, exc_info=error)

718

return True # Try again later

508

# In case checker_command has exactly one % operator

509

command = self.checker_command % self.host

510

except TypeError:

511

# Escape attributes for the shell

512

escaped_attrs = dict(

513

(attr,

514

re.escape(unicode(str(getattr(self, attr, "")),

515

errors=

516

'replace')))

517

for attr in

518

self.runtime_expansions)

519

520

try:

521

command = self.checker_command % escaped_attrs

522

except TypeError as error:

523

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

524

' %s', self.checker_command, error)

525

return True # Try again later

719

526

self.current_checker_command = command

720

527

try:

721

528

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

724

531

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

725

532

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

726

533

# always replaced by /dev/null.)

727

# The exception is when not debugging but nevertheless

728

# running in the foreground; use the previously

729

# created wnull.

730

popen_args = {}

731

if (not self.server_settings["debug"]

732

and self.server_settings["foreground"]):

733

popen_args.update({"stdout": wnull,

734

"stderr": wnull })

735

534

self.checker = subprocess.Popen(command,

736

535

close_fds=True,

737

shell=True, cwd="/",

738

**popen_args)

739

except OSError as error:

740

logger.error("Failed to start subprocess",

741

exc_info=error)

742

return True

743

self.checker_callback_tag = (gobject.child_watch_add

744

(self.checker.pid,

745

self.checker_callback,

746

data=command))

747

# The checker may have completed before the gobject

748

# watch was added. Check for this.

749

try:

536

shell=True, cwd="/")

537

self.checker_callback_tag = (gobject.child_watch_add

538

(self.checker.pid,

539

self.checker_callback,

540

data=command))

541

# The checker may have completed before the gobject

542

# watch was added. Check for this.

750

543

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

544

if pid:

545

gobject.source_remove(self.checker_callback_tag)

546

self.checker_callback(pid, status, command)

751

547

except OSError as error:

752

if error.errno == errno.ECHILD:

753

# This should never happen

754

logger.error("Child process vanished",

755

exc_info=error)

756

return True

757

raise

758

if pid:

759

gobject.source_remove(self.checker_callback_tag)

760

self.checker_callback(pid, status, command)

548

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

549

error)

761

550

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

762

551

return True

763

552

770

559

return

771

560

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

772

561

try:

773

self.checker.terminate()

562

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

774

563

#time.sleep(0.5)

775

564

#if self.checker.poll() is None:

776

# self.checker.kill()

565

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

777

566

except OSError as error:

778

567

if error.errno != errno.ESRCH: # No such process

779

568

raise

796

585

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

797

586

if byte_arrays and signature != "ay":

798

587

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

799

" signature {0!r}".format(signature))

588

" signature %r" % signature)

800

589

def decorator(func):

801

590

func._dbus_is_property = True

802

591

func._dbus_interface = dbus_interface

810

599

return decorator

811

600

812

601

813

def dbus_interface_annotations(dbus_interface):

814

"""Decorator for marking functions returning interface annotations

815

816

Usage:

817

818

@dbus_interface_annotations("org.example.Interface")

819

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

820

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

821

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

822

"false"}

823

"""

824

def decorator(func):

825

func._dbus_is_interface = True

826

func._dbus_interface = dbus_interface

827

func._dbus_name = dbus_interface

828

return func

829

return decorator

830

831

832

def dbus_annotations(annotations):

833

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

834

Usage:

835

836

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

837

access="r")

838

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

839

"org.freedesktop.DBus.Property."

840

"EmitsChangedSignal": "false"})

841

def Property_dbus_property(self):

842

return dbus.Boolean(False)

843

"""

844

def decorator(func):

845

func._dbus_annotations = annotations

846

return func

847

return decorator

848

849

850

602

class DBusPropertyException(dbus.exceptions.DBusException):

851

603

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

852

604

"""

875

627

"""

876

628

877

629

@staticmethod

878

def _is_dbus_thing(thing):

879

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

880

881

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

882

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

883

"""

884

return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),

885

False)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

886

632

887

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

888

634

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

889

635

"""

890

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

891

name),

892

athing.__get__(self))

636

return ((prop.__get__(self)._dbus_name, prop.__get__(self))

893

637

for cls in self.__class__.__mro__

894

for name, athing in

895

inspect.getmembers(cls,

896

self._is_dbus_thing(thing)))

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

897

640

898

641

def _get_dbus_property(self, interface_name, property_name):

899

642

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

901

644

"""

902

645

for cls in self.__class__.__mro__:

903

646

for name, value in (inspect.getmembers

904

(cls,

905

self._is_dbus_thing("property"))):

647

(cls, self._is_dbus_property)):

906

648

if (value._dbus_name == property_name

907

649

and value._dbus_interface == interface_name):

908

650

return value.__get__(self)

936

678

# The byte_arrays option is not supported yet on

937

679

# signatures other than "ay".

938

680

if prop._dbus_signature != "ay":

939

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

940

"'ay' signature {0!r}"

941

.format(prop._dbus_signature))

942

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

943

for byte in value))

681

raise ValueError

682

value = dbus.ByteArray(''.join(unichr(byte)

683

for byte in value))

944

684

prop(value)

945

685

946

686

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",

951

691

952

692

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

953

693

"""

954

properties = {}

955

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

956

696

if (interface_name

957

697

and interface_name != prop._dbus_interface):

958

698

# Interface non-empty but did not match

962

702

continue

963

703

value = prop()

964

704

if not hasattr(value, "variant_level"):

965

properties[name] = value

705

all[name] = value

966

706

continue

967

properties[name] = type(value)(value, variant_level=

968

value.variant_level+1)

969

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

707

all[name] = type(value)(value, variant_level=

708

value.variant_level+1)

709

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

970

710

971

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

972

712

out_signature="s",

973

713

path_keyword='object_path',

974

714

connection_keyword='connection')

975

715

def Introspect(self, object_path, connection):

976

"""Overloading of standard D-Bus method.

977

978

Inserts property tags and interface annotation tags.

716

"""Standard D-Bus method, overloaded to insert property tags.

979

717

"""

980

718

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

981

719

connection)

988

726

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

989

727

return e

990

728

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

991

# Add property tags

992

729

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

993

730

for name, prop

994

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

995

732

if prop._dbus_interface

996

733

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

997

734

if_tag.appendChild(tag)

998

# Add annotation tags

999

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

1000

for tag in if_tag.getElementsByTagName(typ):

1001

annots = dict()

1002

for name, prop in (self.

1003

_get_all_dbus_things(typ)):

1004

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

1005

and prop._dbus_interface

1006

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

1007

annots.update(getattr

1008

(prop,

1009

"_dbus_annotations",

1010

{}))

1011

for name, value in annots.iteritems():

1012

ann_tag = document.createElement(

1013

"annotation")

1014

ann_tag.setAttribute("name", name)

1015

ann_tag.setAttribute("value", value)

1016

tag.appendChild(ann_tag)

1017

# Add interface annotation tags

1018

for annotation, value in dict(

1019

itertools.chain.from_iterable(

1020

annotations().iteritems()

1021

for name, annotations in

1022

self._get_all_dbus_things("interface")

1023

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

1024

)).iteritems():

1025

ann_tag = document.createElement("annotation")

1026

ann_tag.setAttribute("name", annotation)

1027

ann_tag.setAttribute("value", value)

1028

if_tag.appendChild(ann_tag)

1029

735

# Add the names to the return values for the

1030

736

# "org.freedesktop.DBus.Properties" methods

1031

737

if (if_tag.getAttribute("name")

1046

752

except (AttributeError, xml.dom.DOMException,

1047

753

xml.parsers.expat.ExpatError) as error:

1048

754

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

1049

exc_info=error)

755

error)

1050

756

return xmlstring

1051

757

1052

758

1053

def datetime_to_dbus(dt, variant_level=0):

759

def datetime_to_dbus (dt, variant_level=0):

1054

760

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

1055

761

if dt is None:

1056

762

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

1057

763

return dbus.String(dt.isoformat(),

1058

764

variant_level=variant_level)

1059

765

1060

1061

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1062

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

1063

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

1064

interface names according to the "alt_interface_names" mapping.

1065

Usage:

1066

1067

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

1068

"net.example.AlternateInterface"})

1069

class SampleDBusObject(dbus.service.Object):

1070

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

1071

def SampleDBusMethod():

1072

pass

1073

1074

The above "SampleDBusMethod" on "SampleDBusObject" will be

1075

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

1076

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

1077

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

1078

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

1079

1080

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

1081

(from DBusObjectWithProperties) and interfaces (from the

1082

dbus_interface_annotations decorator).

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

"""Applied to an empty subclass of a D-Bus object, this metaclass

769

will add additional D-Bus attributes matching a certain pattern.

1083

770

"""

1084

def wrapper(cls):

1085

for orig_interface_name, alt_interface_name in (

1086

alt_interface_names.iteritems()):

1087

attr = {}

1088

interface_names = set()

1089

# Go though all attributes of the class

1090

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

771

def __new__(mcs, name, bases, attr):

772

# Go through all the base classes which could have D-Bus

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

if issubclass(b, dbus.service.Object)):

776

# Go though all attributes of the base class

777

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

1091

778

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

1092

779

# with the wrong interface name

1093

780

if (not hasattr(attribute, "_dbus_interface")

1094

781

or not attribute._dbus_interface

1095

.startswith(orig_interface_name)):

782

.startswith("se.recompile.Mandos")):

1096

783

continue

1097

784

# Create an alternate D-Bus interface name based on

1098

785

# the current name

1099

786

alt_interface = (attribute._dbus_interface

1100

.replace(orig_interface_name,

1101

alt_interface_name))

1102

interface_names.add(alt_interface)

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1103

789

# Is this a D-Bus signal?

1104

790

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

1105

# Extract the original non-method undecorated

1106

# function by black magic

791

# Extract the original non-method function by

792

# black magic

1107

793

nonmethod_func = (dict(

1108

794

zip(attribute.func_code.co_freevars,

1109

795

attribute.__closure__))["func"]

1120

806

nonmethod_func.func_name,

1121

807

nonmethod_func.func_defaults,

1122

808

nonmethod_func.func_closure)))

1123

# Copy annotations, if any

1124

try:

1125

new_function._dbus_annotations = (

1126

dict(attribute._dbus_annotations))

1127

except AttributeError:

1128

pass

1129

809

# Define a creator of a function to call both the

1130

# original and alternate functions, so both the

1131

# original and alternate signals gets sent when

1132

# the function is called

810

# old and new functions, so both the old and new

811

# signals gets sent when the function is called

1133

812

def fixscope(func1, func2):

1134

813

"""This function is a scope container to pass

1135

814

func1 and func2 to the "call_both" function

1142

821

return call_both

1143

822

# Create the "call_both" function and add it to

1144

823

# the class

1145

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1146

826

# Is this a D-Bus method?

1147

827

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

1148

828

# Create a new, but exactly alike, function

1159

839

attribute.func_name,

1160

840

attribute.func_defaults,

1161

841

attribute.func_closure)))

1162

# Copy annotations, if any

1163

try:

1164

attr[attrname]._dbus_annotations = (

1165

dict(attribute._dbus_annotations))

1166

except AttributeError:

1167

pass

1168

842

# Is this a D-Bus property?

1169

843

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

1170

844

# Create a new, but exactly alike, function

1184

858

attribute.func_name,

1185

859

attribute.func_defaults,

1186

860

attribute.func_closure)))

1187

# Copy annotations, if any

1188

try:

1189

attr[attrname]._dbus_annotations = (

1190

dict(attribute._dbus_annotations))

1191

except AttributeError:

1192

pass

1193

# Is this a D-Bus interface?

1194

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

1195

# Create a new, but exactly alike, function

1196

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

1197

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

1198

# to the class.

1199

attr[attrname] = (dbus_interface_annotations

1200

(alt_interface)

1201

(types.FunctionType

1202

(attribute.func_code,

1203

attribute.func_globals,

1204

attribute.func_name,

1205

attribute.func_defaults,

1206

attribute.func_closure)))

1207

if deprecate:

1208

# Deprecate all alternate interfaces

1209

iname="_AlternateDBusNames_interface_annotation{0}"

1210

for interface_name in interface_names:

1211

@dbus_interface_annotations(interface_name)

1212

def func(self):

1213

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

1214

"true" }

1215

# Find an unused name

1216

for aname in (iname.format(i)

1217

for i in itertools.count()):

1218

if aname not in attr:

1219

attr[aname] = func

1220

break

1221

if interface_names:

1222

# Replace the class with a new subclass of it with

1223

# methods, signals, etc. as created above.

1224

cls = type(b"{0}Alternate".format(cls.__name__),

1225

(cls,), attr)

1226

return cls

1227

return wrapper

1228

1229

1230

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

1231

"se.bsnet.fukt.Mandos"})

861

return type.__new__(mcs, name, bases, attr)

862

1232

863

class ClientDBus(Client, DBusObjectWithProperties):

1233

864

"""A Client class using D-Bus

1234

865

1243

874

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

1244

875

1245

876

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

877

self._approvals_pending = 0

1246

878

self.bus = bus

1247

879

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

1248

880

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

1254

886

("/clients/" + client_object_name))

1255

887

DBusObjectWithProperties.__init__(self, self.bus,

1256

888

self.dbus_object_path)

1257

889

1258

890

def notifychangeproperty(transform_func,

1259

891

dbus_name, type_func=lambda x: x,

1260

892

variant_level=1):

1261

893

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

1262

894

its changes to DBus.

1263

895

1264

896

transform_fun: Function that takes a value and a variant_level

1265

897

and transforms it to a D-Bus type.

1266

898

dbus_name: D-Bus name of the variable

1283

915

1284

916

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

1285

917

918

1286

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1287

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1288

921

"ApprovalPending",

1295

928

checker is not None)

1296

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1297

930

"LastCheckedOK")

1298

last_checker_status = notifychangeproperty(dbus.Int16,

1299

"LastCheckerStatus")

1300

931

last_approval_request = notifychangeproperty(

1301

932

datetime_to_dbus, "LastApprovalRequest")

1302

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1303

934

"ApprovedByDefault")

1304

approval_delay = notifychangeproperty(dbus.UInt64,

935

approval_delay = notifychangeproperty(dbus.UInt16,

1305

936

"ApprovalDelay",

1306

937

type_func =

1307

timedelta_to_milliseconds)

938

_timedelta_to_milliseconds)

1308

939

approval_duration = notifychangeproperty(

1309

dbus.UInt64, "ApprovalDuration",

1310

type_func = timedelta_to_milliseconds)

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1311

942

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

1312

timeout = notifychangeproperty(dbus.UInt64, "Timeout",

943

timeout = notifychangeproperty(dbus.UInt16, "Timeout",

1313

944

type_func =

1314

timedelta_to_milliseconds)

945

_timedelta_to_milliseconds)

1315

946

extended_timeout = notifychangeproperty(

1316

dbus.UInt64, "ExtendedTimeout",

1317

type_func = timedelta_to_milliseconds)

1318

interval = notifychangeproperty(dbus.UInt64,

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1319

950

"Interval",

1320

951

type_func =

1321

timedelta_to_milliseconds)

952

_timedelta_to_milliseconds)

1322

953

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

1323

954

1324

955

del notifychangeproperty

1352

983

*args, **kwargs)

1353

984

1354

985

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

1355

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

986

old_checker = self.checker

987

if self.checker is not None:

988

old_checker_pid = self.checker.pid

989

else:

990

old_checker_pid = None

1356

991

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

1357

992

# Only if new checker process was started

1358

993

if (self.checker is not None

1362

997

return r

1363

998

1364

999

def _reset_approved(self):

1365

self.approved = None

1000

self._approved = None

1366

1001

return False

1367

1002

1368

1003

def approve(self, value=True):

1369

self.approved = value

1370

gobject.timeout_add(timedelta_to_milliseconds

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1371

1007

(self.approval_duration),

1372

1008

self._reset_approved)

1373

self.send_changedstate()

1009

1374

1010

1375

1011

## D-Bus methods, signals & properties

1376

1012

_interface = "se.recompile.Mandos.Client"

1377

1013

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1385

1014

## Signals

1386

1015

1387

1016

# CheckerCompleted - signal

1486

1115

access="readwrite")

1487

1116

def ApprovalDuration_dbus_property(self, value=None):

1488

1117

if value is None: # get

1489

return dbus.UInt64(timedelta_to_milliseconds(

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1490

1119

self.approval_duration))

1491

1120

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

1492

1121

1506

1135

def Host_dbus_property(self, value=None):

1507

1136

if value is None: # get

1508

1137

return dbus.String(self.host)

1509

self.host = unicode(value)

1138

self.host = value

1510

1139

1511

1140

# Created - property

1512

1141

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

1513

1142

def Created_dbus_property(self):

1514

return datetime_to_dbus(self.created)

1143

return dbus.String(datetime_to_dbus(self.created))

1515

1144

1516

1145

# LastEnabled - property

1517

1146

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

1538

1167

return

1539

1168

return datetime_to_dbus(self.last_checked_ok)

1540

1169

1541

# LastCheckerStatus - property

1542

@dbus_service_property(_interface, signature="n",

1543

access="read")

1544

def LastCheckerStatus_dbus_property(self):

1545

return dbus.Int16(self.last_checker_status)

1546

1547

1170

# Expires - property

1548

1171

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

1549

1172

def Expires_dbus_property(self):

1560

1183

def Timeout_dbus_property(self, value=None):

1561

1184

if value is None: # get

1562

1185

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1564

1186

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

1565

# Reschedule disabling

1566

if self.enabled:

1567

now = datetime.datetime.utcnow()

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1570

# The timeout has passed

1571

self.disable()

1572

else:

1573

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

1574

is None):

1575

return

1576

gobject.source_remove(self.disable_initiator_tag)

1577

self.disable_initiator_tag = (

1578

gobject.timeout_add(

1579

timedelta_to_milliseconds(self.expires - now),

1580

self.disable))

1187

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

1188

return

1189

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

1581

1207

1582

1208

# ExtendedTimeout - property

1583

1209

@dbus_service_property(_interface, signature="t",

1596

1222

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

1597

1223

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

1598

1224

return

1599

if self.enabled:

1600

# Reschedule checker run

1601

gobject.source_remove(self.checker_initiator_tag)

1602

self.checker_initiator_tag = (gobject.timeout_add

1603

(value, self.start_checker))

1604

self.start_checker() # Start one now, too

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

1605

1230

1606

1231

# Checker - property

1607

1232

@dbus_service_property(_interface, signature="s",

1609

1234

def Checker_dbus_property(self, value=None):

1610

1235

if value is None: # get

1611

1236

return dbus.String(self.checker_command)

1612

self.checker_command = unicode(value)

1237

self.checker_command = value

1613

1238

1614

1239

# CheckerRunning - property

1615

1240

@dbus_service_property(_interface, signature="b",

1644

1269

raise KeyError()

1645

1270

1646

1271

def __getattribute__(self, name):

1647

if name == '_pipe':

1272

if(name == '_pipe'):

1648

1273

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

1649

1274

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

1650

1275

data = self._pipe.recv()

1657

1282

return func

1658

1283

1659

1284

def __setattr__(self, name, value):

1660

if name == '_pipe':

1285

if(name == '_pipe'):

1661

1286

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

1662

1287

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

1663

1288

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1664

1291

1665

1292

class ClientHandler(socketserver.BaseRequestHandler, object):

1666

1293

"""A class to handle client connections.

1703

1330

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

1704

1331

try:

1705

1332

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

1706

raise RuntimeError(line)

1333

raise RuntimeError

1707

1334

except (ValueError, IndexError, RuntimeError) as error:

1708

1335

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

1709

1336

return

1749

1376

client.Rejected("Disabled")

1750

1377

return

1751

1378

1752

if client.approved or not client.approval_delay:

1379

if client._approved or not client.approval_delay:

1753

1380

#We are approved or approval is disabled

1754

1381

break

1755

elif client.approved is None:

1382

elif client._approved is None:

1756

1383

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

1757

1384

client.name)

1758

1385

if self.server.use_dbus:

1771

1398

#wait until timeout or approved

1772

1399

time = datetime.datetime.now()

1773

1400

client.changedstate.acquire()

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1777

1404

client.changedstate.release()

1778

1405

time2 = datetime.datetime.now()

1779

1406

if (time2 - time) >= delay:

1795

1422

try:

1796

1423

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

1797

1424

except gnutls.errors.GNUTLSError as error:

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1425

logger.warning("gnutls send failed")

1800

1426

return

1801

1427

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

1802

1428

sent, len(client.secret)

1805

1431

1806

1432

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

1807

1433

# bump the timeout using extended_timeout

1808

client.bump_timeout(client.extended_timeout)

1434

client.checked_ok(client.extended_timeout)

1809

1435

if self.server.use_dbus:

1810

1436

# Emit D-Bus signal

1811

1437

client.GotSecret()

1816

1442

try:

1817

1443

session.bye()

1818

1444

except gnutls.errors.GNUTLSError as error:

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1821

1446

1822

1447

@staticmethod

1823

1448

def peer_certificate(session):

1879

1504

# Convert the buffer to a Python bytestring

1880

1505

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

1881

1506

# Convert the bytestring to hexadecimal notation

1882

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

1507

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

1883

1508

return hex_fpr

1884

1509

1885

1510

1888

1513

def sub_process_main(self, request, address):

1889

1514

try:

1890

1515

self.finish_request(request, address)

1891

except Exception:

1516

except:

1892

1517

self.handle_error(request, address)

1893

1518

self.close_request(request)

1894

1519

1895

1520

def process_request(self, request, address):

1896

1521

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

1897

1522

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

1898

args = (request, address))

1523

args = (request,

1524

address))

1899

1525

proc.start()

1900

1526

return proc

1901

1527

1916

1542

1917

1543

def add_pipe(self, parent_pipe, proc):

1918

1544

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

1919

raise NotImplementedError()

1545

raise NotImplementedError

1920

1546

1921

1547

1922

1548

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1929

1555

use_ipv6: Boolean; to use IPv6 or not

1930

1556

"""

1931

1557

def __init__(self, server_address, RequestHandlerClass,

1932

interface=None, use_ipv6=True, socketfd=None):

1933

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

1934

creating a new one with socket.socket().

1935

"""

1558

interface=None, use_ipv6=True):

1936

1559

self.interface = interface

1937

1560

if use_ipv6:

1938

1561

self.address_family = socket.AF_INET6

1939

if socketfd is not None:

1940

# Save the file descriptor

1941

self.socketfd = socketfd

1942

# Save the original socket.socket() function

1943

self.socket_socket = socket.socket

1944

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

1945

#

1946

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

1947

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

1948

# patching socket.socket.)

1949

#

1950

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

1951

@functools.wraps(socket.socket)

1952

def socket_wrapper(*args, **kwargs):

1953

# Restore original function so subsequent calls are

1954

# not affected.

1955

socket.socket = self.socket_socket

1956

del self.socket_socket

1957

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

1958

# saved file descriptor.

1959

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

1960

# Replace socket.socket() function with wrapper

1961

socket.socket = socket_wrapper

1962

# The socketserver.TCPServer.__init__ will call

1963

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

1964

# socket_wrapper(), if socketfd was set.

1965

1562

socketserver.TCPServer.__init__(self, server_address,

1966

1563

RequestHandlerClass)

1967

1968

1564

def server_bind(self):

1969

1565

"""This overrides the normal server_bind() function

1970

1566

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

1978

1574

try:

1979

1575

self.socket.setsockopt(socket.SOL_SOCKET,

1980

1576

SO_BINDTODEVICE,

1981

str(self.interface + '\0'))

1577

str(self.interface

1578

+ '\0'))

1982

1579

except socket.error as error:

1983

if error.errno == errno.EPERM:

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1986

elif error.errno == errno.ENOPROTOOPT:

1580

if error[0] == errno.EPERM:

1581

logger.error("No permission to"

1582

" bind to interface %s",

1583

self.interface)

1584

elif error[0] == errno.ENOPROTOOPT:

1987

1585

logger.error("SO_BINDTODEVICE not available;"

1988

1586

" cannot bind to interface %s",

1989

1587

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1993

1588

else:

1994

1589

raise

1995

1590

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

1998

1593

if self.address_family == socket.AF_INET6:

1999

1594

any_address = "::" # in6addr_any

2000

1595

else:

2001

any_address = "0.0.0.0" # INADDR_ANY

1596

any_address = socket.INADDR_ANY

2002

1597

self.server_address = (any_address,

2003

1598

self.server_address[1])

2004

1599

elif not self.server_address[1]:

2025

1620

"""

2026

1621

def __init__(self, server_address, RequestHandlerClass,

2027

1622

interface=None, use_ipv6=True, clients=None,

2028

gnutls_priority=None, use_dbus=True, socketfd=None):

1623

gnutls_priority=None, use_dbus=True):

2029

1624

self.enabled = False

2030

1625

self.clients = clients

2031

1626

if self.clients is None:

2032

self.clients = {}

1627

self.clients = set()

2033

1628

self.use_dbus = use_dbus

2034

1629

self.gnutls_priority = gnutls_priority

2035

1630

IPv6_TCPServer.__init__(self, server_address,

2036

1631

RequestHandlerClass,

2037

1632

interface = interface,

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1633

use_ipv6 = use_ipv6)

2040

1634

def server_activate(self):

2041

1635

if self.enabled:

2042

1636

return socketserver.TCPServer.server_activate(self)

2055

1649

2056

1650

def handle_ipc(self, source, condition, parent_pipe=None,

2057

1651

proc = None, client_object=None):

1652

condition_names = {

1653

gobject.IO_IN: "IN", # There is data to read.

1654

gobject.IO_OUT: "OUT", # Data can be written (without

1655

# blocking).

1656

gobject.IO_PRI: "PRI", # There is urgent data to read.

1657

gobject.IO_ERR: "ERR", # Error condition.

1658

gobject.IO_HUP: "HUP" # Hung up (the connection has been

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

2058

1666

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

2059

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

1667

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

2060

1668

# Wait for other process to exit

2061

1669

proc.join()

2062

1670

return False

2069

1677

fpr = request[1]

2070

1678

address = request[2]

2071

1679

2072

for c in self.clients.itervalues():

1680

for c in self.clients:

2073

1681

if c.fingerprint == fpr:

2074

1682

client = c

2075

1683

break

2120

1728

return True

2121

1729

2122

1730

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

2222

1731

def string_to_delta(interval):

2223

1732

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

2224

1733

2235

1744

>>> string_to_delta('5m 30s')

2236

1745

datetime.timedelta(0, 330)

2237

1746

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2244

1747

timevalue = datetime.timedelta(0)

2245

1748

for s in interval.split():

2246

1749

try:

2257

1760

elif suffix == "w":

2258

1761

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

2259

1762

else:

2260

raise ValueError("Unknown suffix {0!r}"

2261

.format(suffix))

2262

except IndexError as e:

1763

raise ValueError("Unknown suffix %r" % suffix)

1764

except (ValueError, IndexError) as e:

2263

1765

raise ValueError(*(e.args))

2264

1766

timevalue += delta

2265

1767

return timevalue

2266

1768

2267

1769

1770

def if_nametoindex(interface):

1771

"""Call the C function if_nametoindex(), or equivalent

1772

1773

Note: This function cannot accept a unicode string."""

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

logger.warning("Doing if_nametoindex the hard way")

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

interface_index = struct.unpack(str("I"),

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

2268

1794

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

2269

1795

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

2270

1796

2278

1804

sys.exit()

2279

1805

if not noclose:

2280

1806

# Close all standard open file descriptors

2281

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

1807

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

2282

1808

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

2283

1809

raise OSError(errno.ENODEV,

2284

"{0} not a character device"

2285

.format(os.devnull))

1810

"%s not a character device"

1811

% os.path.devnull)

2286

1812

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

2287

1813

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

2288

1814

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

2297

1823

2298

1824

parser = argparse.ArgumentParser()

2299

1825

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

2300

version = "%(prog)s {0}".format(version),

1826

version = "%%(prog)s %s" % version,

2301

1827

help="show version number and exit")

2302

1828

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

2303

1829

help="Bind to interface IF")

2309

1835

help="Run self-test")

2310

1836

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

2311

1837

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

2312

" to terminal", default=None)

1838

" to terminal")

2313

1839

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

2314

1840

help="Debug level for stdout output")

2315

1841

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

2322

1848

" files")

2323

1849

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

2324

1850

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

2325

" system bus interface", default=None)

1851

" system bus interface")

2326

1852

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

2327

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

2328

default=None)

2329

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

2330

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

2331

" state", default=None)

2332

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

2333

help="Specify a file descriptor to a network"

2334

" socket to use instead of creating one")

2335

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

2336

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

2337

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

2338

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

2339

1853

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

2340

1854

options = parser.parse_args()

2341

1855

2342

1856

if options.check:

2343

1857

import doctest

2344

fail_count, test_count = doctest.testmod()

2345

sys.exit(os.EX_OK if fail_count == 0 else 1)

1858

doctest.testmod()

1859

sys.exit()

2346

1860

2347

1861

# Default values for config file for server-global settings

2348

1862

server_defaults = { "interface": "",

2350

1864

"port": "",

2351

1865

"debug": "False",

2352

1866

"priority":

2353

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

1867

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",

2354

1868

"servicename": "Mandos",

2355

1869

"use_dbus": "True",

2356

1870

"use_ipv6": "True",

2357

1871

"debuglevel": "",

2358

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

2362

1872

}

2363

1873

2364

1874

# Parse config file for server-global settings

2369

1879

# Convert the SafeConfigParser object to a dict

2370

1880

server_settings = server_config.defaults()

2371

1881

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

2372

for option in ("debug", "use_dbus", "use_ipv6", "foreground"):

1882

for option in ("debug", "use_dbus", "use_ipv6"):

2373

1883

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

2374

1884

option)

2375

1885

if server_settings["port"]:

2376

1886

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

2377

1887

"port")

2378

if server_settings["socket"]:

2379

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

2380

"socket")

2381

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

2382

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

2383

# happen with a supplied network socket.

2384

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

2385

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

2386

["socket"])

2387

1888

del server_config

2388

1889

2389

1890

# Override the settings from the config file with command line

2390

1891

# options, if set.

2391

1892

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

2392

1893

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

2393

"use_dbus", "use_ipv6", "debuglevel", "restore",

2394

"statedir", "socket", "foreground"):

1894

"use_dbus", "use_ipv6", "debuglevel"):

2395

1895

value = getattr(options, option)

2396

1896

if value is not None:

2397

1897

server_settings[option] = value

2400

1900

for option in server_settings.keys():

2401

1901

if type(server_settings[option]) is str:

2402

1902

server_settings[option] = unicode(server_settings[option])

2403

# Force all boolean options to be boolean

2404

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

2405

"foreground"):

2406

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

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

2410

1903

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

2411

1904

2412

1905

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

2416

1909

debuglevel = server_settings["debuglevel"]

2417

1910

use_dbus = server_settings["use_dbus"]

2418

1911

use_ipv6 = server_settings["use_ipv6"]

2419

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

2420

stored_state_file)

2421

foreground = server_settings["foreground"]

2422

2423

if debug:

2424

initlogger(debug, logging.DEBUG)

2425

else:

2426

if not debuglevel:

2427

initlogger(debug)

2428

else:

2429

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

2430

initlogger(debug, level)

2431

1912

2432

1913

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

2433

1914

syslogger.setFormatter(logging.Formatter

2434

('Mandos ({0}) [%(process)d]:'

2435

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

2436

.format(server_settings

2437

["servicename"])))

1915

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

1916

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

1917

% server_settings["servicename"]))

2438

1918

2439

1919

# Parse config file with clients

2440

client_config = configparser.SafeConfigParser(Client

2441

.client_defaults)

1920

client_defaults = { "timeout": "5m",

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2442

1929

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

2443

1930

"clients.conf"))

2444

1931

2453

1940

use_ipv6=use_ipv6,

2454

1941

gnutls_priority=

2455

1942

server_settings["priority"],

2456

use_dbus=use_dbus,

2457

socketfd=(server_settings["socket"]

2458

or None))

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

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

2462

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

2463

pidfile = None

1943

use_dbus=use_dbus)

1944

if not debug:

1945

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

2464

1946

try:

2465

1947

pidfile = open(pidfilename, "w")

2466

except IOError as e:

2467

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

2468

exc_info=e)

1948

except IOError:

1949

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

2469

1950

2470

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

1951

try:

1952

uid = pwd.getpwnam("_mandos").pw_uid

1953

gid = pwd.getpwnam("_mandos").pw_gid

1954

except KeyError:

2471

1955

try:

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

1956

uid = pwd.getpwnam("mandos").pw_uid

1957

gid = pwd.getpwnam("mandos").pw_gid

2475

1958

except KeyError:

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

1959

try:

1960

uid = pwd.getpwnam("nobody").pw_uid

1961

gid = pwd.getpwnam("nobody").pw_gid

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2480

1965

try:

2481

1966

os.setgid(gid)

2482

1967

os.setuid(uid)

2483

1968

except OSError as error:

2484

if error.errno != errno.EPERM:

2485

raise

1969

if error[0] != errno.EPERM:

1970

raise error

1971

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

2486

1979

2487

1980

if debug:

2488

1981

# Enable all possible GnuTLS debugging

2499

1992

.gnutls_global_set_log_function(debug_gnutls))

2500

1993

2501

1994

# Redirect stdin so all checkers get /dev/null

2502

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

1995

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

2503

1996

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

2504

1997

if null > 2:

2505

1998

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2506

2002

2507

2003

# Need to fork before connecting to D-Bus

2508

if not foreground:

2004

if not debug:

2509

2005

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

2510

2006

daemon()

2511

2007

2512

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

2513

# need to inform gobject that threads will be used.

2514

gobject.threads_init()

2515

2516

2008

global main_loop

2517

2009

# From the Avahi example code

2518

DBusGMainLoop(set_as_default=True)

2010

DBusGMainLoop(set_as_default=True )

2519

2011

main_loop = gobject.MainLoop()

2520

2012

bus = dbus.SystemBus()

2521

2013

# End of Avahi example code

2527

2019

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

2528

2020

do_not_queue=True))

2529

2021

except dbus.exceptions.NameExistsException as e:

2530

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

2022

logger.error(unicode(e) + ", disabling D-Bus")

2531

2023

use_dbus = False

2532

2024

server_settings["use_dbus"] = False

2533

2025

tcp_server.use_dbus = False

2534

2026

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2535

service = AvahiServiceToSyslog(name =

2536

server_settings["servicename"],

2537

servicetype = "_mandos._tcp",

2538

protocol = protocol, bus = bus)

2027

service = AvahiService(name = server_settings["servicename"],

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2539

2030

if server_settings["interface"]:

2540

2031

service.interface = (if_nametoindex

2541

2032

(str(server_settings["interface"])))

2545

2036

2546

2037

client_class = Client

2547

2038

if use_dbus:

2548

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

2549

2550

client_settings = Client.config_parser(client_config)

2551

old_client_settings = {}

2552

clients_data = {}

2553

2554

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

2555

global wnull

2556

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

2557

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

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2562

# Get client data and settings from last running state.

2563

if server_settings["restore"]:

2564

try:

2565

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

2566

clients_data, old_client_settings = (pickle.load

2567

(stored_state))

2568

os.remove(stored_state_path)

2569

except IOError as e:

2570

if e.errno == errno.ENOENT:

2571

logger.warning("Could not load persistent state: {0}"

2572

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

2573

else:

2574

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

2575

exc_info=e)

2576

raise

2577

except EOFError as e:

2578

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

2579

"EOFError:", exc_info=e)

2580

2581

with PGPEngine() as pgp:

2582

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

# Decide which value to use after restoring saved state.

2588

# We have three different values: Old config file,

2589

# new config file, and saved state.

2590

# New config value takes precedence if it differs from old

2591

# config value, otherwise use saved state.

2592

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

2593

try:

2594

# For each value in new config, check if it

2595

# differs from the old config value (Except for

2596

# the "secret" attribute)

2597

if (name != "secret" and

2598

value != old_client_settings[client_name]

2599

[name]):

2600

client[name] = value

2601

except KeyError:

2602

pass

2603

2604

# Clients who has passed its expire date can still be

2605

# enabled if its last checker was successful. Clients

2606

# whose checker succeeded before we stored its state is

2607

# assumed to have successfully run all checkers during

2608

# downtime.

2609

if client["enabled"]:

2610

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

2611

if not client["last_checked_ok"]:

2612

logger.warning(

2613

"disabling client {0} - Client never "

2614

"performed a successful checker"

2615

.format(client_name))

2616

client["enabled"] = False

2617

elif client["last_checker_status"] != 0:

2618

logger.warning(

2619

"disabling client {0} - Client "

2620

"last checker failed with error code {1}"

2621

.format(client_name,

2622

client["last_checker_status"]))

2623

client["enabled"] = False

2624

else:

2625

client["expires"] = (datetime.datetime

2626

.utcnow()

2627

+ client["timeout"])

2628

logger.debug("Last checker succeeded,"

2629

" keeping {0} enabled"

2630

.format(client_name))

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

for name, value in config.items(section):

2631

2048

try:

2632

client["secret"] = (

2633

pgp.decrypt(client["encrypted_secret"],

2634

client_settings[client_name]

2635

["secret"]))

2636

except PGPError:

2637

# If decryption fails, we use secret from new settings

2638

logger.debug("Failed to decrypt {0} old secret"

2639

.format(client_name))

2640

client["secret"] = (

2641

client_settings[client_name]["secret"])

2642

2643

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

2644

for client_name in (set(old_client_settings)

2645

- set(client_settings)):

2646

del clients_data[client_name]

2647

for client_name in (set(client_settings)

2648

- set(old_client_settings)):

2649

clients_data[client_name] = client_settings[client_name]

2650

2651

# Create all client objects

2652

for client_name, client in clients_data.iteritems():

2653

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2656

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

2657

2058

if not tcp_server.clients:

2658

2059

logger.warning("No clients defined")

2659

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

pidfile.write(str(pid) + "\n".encode("utf-8"))

2666

except IOError:

2667

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

2668

pidfilename, pid)

2669

del pidfile

2060

2061

if not debug:

2062

try:

2063

with pidfile:

2064

pid = os.getpid()

2065

pidfile.write(str(pid) + "\n".encode("utf-8"))

2066

del pidfile

2067

except IOError:

2068

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

2069

pidfilename, pid)

2070

except NameError:

2071

# "pidfile" was never created

2072

pass

2670

2073

del pidfilename

2074

2075

signal.signal(signal.SIGINT, signal.SIG_IGN)

2671

2076

2672

2077

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

2673

2078

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

2674

2079

2675

2080

if use_dbus:

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2081

class MandosDBusService(dbus.service.Object):

2679

2082

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

2680

2083

def __init__(self):

2681

2084

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

2682

2085

_interface = "se.recompile.Mandos"

2683

2086

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2690

2087

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

2691

2088

def ClientAdded(self, objpath):

2692

2089

"D-Bus signal"

2706

2103

def GetAllClients(self):

2707

2104

"D-Bus method"

2708

2105

return dbus.Array(c.dbus_object_path

2709

for c in

2710

tcp_server.clients.itervalues())

2106

for c in tcp_server.clients)

2711

2107

2712

2108

@dbus.service.method(_interface,

2713

2109

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

2715

2111

"D-Bus method"

2716

2112

return dbus.Dictionary(

2717

2113

((c.dbus_object_path, c.GetAll(""))

2718

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

2114

for c in tcp_server.clients),

2719

2115

signature="oa{sv}")

2720

2116

2721

2117

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

2722

2118

def RemoveClient(self, object_path):

2723

2119

"D-Bus method"

2724

for c in tcp_server.clients.itervalues():

2120

for c in tcp_server.clients:

2725

2121

if c.dbus_object_path == object_path:

2726

del tcp_server.clients[c.name]

2122

tcp_server.clients.remove(c)

2727

2123

c.remove_from_connection()

2728

2124

# Don't signal anything except ClientRemoved

2729

2125

c.disable(quiet=True)

2734

2130

2735

2131

del _interface

2736

2132

2737

mandos_dbus_service = MandosDBusService()

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2738

2136

2739

2137

def cleanup():

2740

2138

"Cleanup function; run on exit"

2741

2139

service.cleanup()

2742

2140

2743

2141

multiprocessing.active_children()

2744

wnull.close()

2745

if not (tcp_server.clients or client_settings):

2746

return

2747

2748

# Store client before exiting. Secrets are encrypted with key

2749

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

2750

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

2751

clients = {}

2752

with PGPEngine() as pgp:

2753

for client in tcp_server.clients.itervalues():

2754

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

2755

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

2756

key)

2757

client_dict = {}

2758

2759

# A list of attributes that can not be pickled

2760

# + secret.

2761

exclude = set(("bus", "changedstate", "secret",

2762

"checker", "server_settings"))

2763

for name, typ in (inspect.getmembers

2764

(dbus.service.Object)):

2765

exclude.add(name)

2766

2767

client_dict["encrypted_secret"] = (client

2768

.encrypted_secret)

2769

for attr in client.client_structure:

2770

if attr not in exclude:

2771

client_dict[attr] = getattr(client, attr)

2772

2773

clients[client.name] = client_dict

2774

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

2775

2776

try:

2777

with (tempfile.NamedTemporaryFile

2778

(mode='wb', suffix=".pickle", prefix='clients-',

2779

dir=os.path.dirname(stored_state_path),

2780

delete=False)) as stored_state:

2781

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

2782

tempname=stored_state.name

2783

os.rename(tempname, stored_state_path)

2784

except (IOError, OSError) as e:

2785

if not debug:

2786

try:

2787

os.remove(tempname)

2788

except NameError:

2789

pass

2790

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

2791

logger.warning("Could not save persistent state: {0}"

2792

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

2793

else:

2794

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

2795

exc_info=e)

2796

raise

2797

2798

# Delete all clients, and settings from config

2799

2142

while tcp_server.clients:

2800

name, client = tcp_server.clients.popitem()

2143

client = tcp_server.clients.pop()

2801

2144

if use_dbus:

2802

2145

client.remove_from_connection()

2146

client.disable_hook = None

2803

2147

# Don't signal anything except ClientRemoved

2804

2148

client.disable(quiet=True)

2805

2149

if use_dbus:

2807

2151

mandos_dbus_service.ClientRemoved(client

2808

2152

.dbus_object_path,

2809

2153

client.name)

2810

client_settings.clear()

2811

2154

2812

2155

atexit.register(cleanup)

2813

2156

2814

for client in tcp_server.clients.itervalues():

2157

for client in tcp_server.clients:

2815

2158

if use_dbus:

2816

2159

# Emit D-Bus signal

2817

2160

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2818

# Need to initiate checking of clients

2819

if client.enabled:

2820

client.init_checker()

2161

client.enable()

2821

2162

2822

2163

tcp_server.enable()

2823

2164

tcp_server.server_activate()

2826

2167

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

2827

2168

if use_ipv6:

2828

2169

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

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2831

2172

else: # IPv4

2832

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

2833

*tcp_server.socket.getsockname())

2173

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

2174

% tcp_server.socket.getsockname())

2834

2175

2835

2176

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

2836

2177

2839

2180

try:

2840

2181

service.activate()

2841

2182

except dbus.exceptions.DBusException as error:

2842

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

2183

logger.critical("DBusException: %s", error)

2843

2184

cleanup()

2844

2185

sys.exit(1)

2845

2186

# End of Avahi example code

2852

2193

logger.debug("Starting main loop")

2853

2194

main_loop.run()

2854

2195

except AvahiError as error:

2855

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

2196

logger.critical("AvahiError: %s", error)

2856

2197

cleanup()

2857

2198

sys.exit(1)

2858

2199

except KeyboardInterrupt:

2863

2204

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

2864

2205

cleanup()

2865

2206

2207

2866

2208

if __name__ == '__main__':

2867

2209

main()