/mandos/trunk : revision 678

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

37

39

import SocketServer as socketserver

38

40

import socket

39

41

import argparse

63

65

import cPickle as pickle

64

66

import multiprocessing

65

67

import types

68

import binascii

69

import tempfile

70

import itertools

71

import collections

66

72

67

73

import dbus

68

74

import dbus.service

82

88

except ImportError:

83

89

SO_BINDTODEVICE = None

84

90

85

86

version = "1.4.0"

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)

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

103

222

104

223

class AvahiError(Exception):

105

224

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

123

242

Used to optionally bind to the specified interface.

124

243

name: string; Example: 'Mandos'

125

244

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

126

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

245

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

127

246

port: integer; what port to announce

128

247

TXT: list of strings; TXT record for the service

129

248

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

135

254

server: D-Bus Server

136

255

bus: dbus.SystemBus()

137

256

"""

257

138

258

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

139

259

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

140

260

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

153

273

self.server = None

154

274

self.bus = bus

155

275

self.entry_group_state_changed_match = None

276

156

277

def rename(self):

157

278

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

158

279

if self.rename_count >= self.max_renames:

164

285

.GetAlternativeServiceName(self.name))

165

286

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

166

287

self.name)

167

syslogger.setFormatter(logging.Formatter

168

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

169

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

170

% self.name))

171

288

self.remove()

172

289

try:

173

290

self.add()

174

291

except dbus.exceptions.DBusException as error:

175

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

292

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

176

293

self.cleanup()

177

294

os._exit(1)

178

295

self.rename_count += 1

296

179

297

def remove(self):

180

298

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

181

299

if self.entry_group_state_changed_match is not None:

183

301

self.entry_group_state_changed_match = None

184

302

if self.group is not None:

185

303

self.group.Reset()

304

186

305

def add(self):

187

306

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

188

307

self.remove()

193

312

avahi.DBUS_INTERFACE_ENTRY_GROUP)

194

313

self.entry_group_state_changed_match = (

195

314

self.group.connect_to_signal(

196

'StateChanged', self .entry_group_state_changed))

315

'StateChanged', self.entry_group_state_changed))

197

316

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

198

317

self.name, self.type)

199

318

self.group.AddService(

205

324

dbus.UInt16(self.port),

206

325

avahi.string_array_to_txt_array(self.TXT))

207

326

self.group.Commit()

327

208

328

def entry_group_state_changed(self, state, error):

209

329

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

210

330

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

217

337

elif state == avahi.ENTRY_GROUP_FAILURE:

218

338

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

219

339

unicode(error))

220

raise AvahiGroupError("State changed: %s"

221

% unicode(error))

340

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

341

.format(error))

342

222

343

def cleanup(self):

223

344

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

224

345

if self.group is not None:

225

346

try:

226

347

self.group.Free()

227

348

except (dbus.exceptions.UnknownMethodException,

228

dbus.exceptions.DBusException) as e:

349

dbus.exceptions.DBusException):

229

350

pass

230

351

self.group = None

231

352

self.remove()

353

232

354

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

233

355

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

234

356

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

253

375

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

254

376

else:

255

377

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

378

256

379

def activate(self):

257

380

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

258

381

if self.server is None:

266

389

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

267

390

268

391

269

def _timedelta_to_milliseconds(td):

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):

270

404

"Convert a datetime.timedelta() to milliseconds"

271

405

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

272

406

+ (td.seconds * 1000)

273

407

+ (td.microseconds // 1000))

274

408

409

275

410

class Client(object):

276

411

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

277

412

278

413

Attributes:

279

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

414

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

280

415

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

281

416

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

282

417

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

289

424

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

290

425

checker_initiator_tag: a gobject event source tag, or None

291

426

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

292

429

current_checker_command: string; current running checker_command

293

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

294

430

disable_initiator_tag: a gobject event source tag, or None

295

431

enabled: bool()

296

432

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

299

435

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

300

436

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

301

437

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

302

last_enabled: datetime.datetime(); (UTC)

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

303

442

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

304

443

D-Bus identifiers

305

444

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

306

445

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

307

446

until this client is disabled

308

extended_timeout: extra long timeout when password has been sent

447

extended_timeout: extra long timeout when secret has been sent

309

448

runtime_expansions: Allowed attributes for runtime expansion.

310

449

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

311

450

disabled, or None

451

server_settings: The server_settings dict from main()

312

452

"""

313

453

314

454

runtime_expansions = ("approval_delay", "approval_duration",

315

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

316

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

455

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

456

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

457

"last_approval_request", "last_checked_ok",

317

458

"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

}

318

469

319

470

def timeout_milliseconds(self):

320

471

"Return the 'timeout' attribute in milliseconds"

321

return _timedelta_to_milliseconds(self.timeout)

472

return timedelta_to_milliseconds(self.timeout)

322

473

323

474

def extended_timeout_milliseconds(self):

324

475

"Return the 'extended_timeout' attribute in milliseconds"

325

return _timedelta_to_milliseconds(self.extended_timeout)

476

return timedelta_to_milliseconds(self.extended_timeout)

326

477

327

478

def interval_milliseconds(self):

328

479

"Return the 'interval' attribute in milliseconds"

329

return _timedelta_to_milliseconds(self.interval)

480

return timedelta_to_milliseconds(self.interval)

330

481

331

482

def approval_delay_milliseconds(self):

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."""

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):

338

533

self.name = name

339

if config is None:

340

config = {}

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

341

551

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

342

552

# Uppercase and remove spaces from fingerprint for later

343

553

# comparison purposes with return value from the fingerprint()

344

554

# function

345

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

346

.replace(" ", ""))

347

555

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

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

556

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

557

datetime.datetime.utcnow())

558

559

# attributes specific for this server instance

369

560

self.checker = None

370

561

self.checker_initiator_tag = None

371

562

self.disable_initiator_tag = None

372

self.expires = None

373

563

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

375

564

self.current_checker_command = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

565

self.approved = None

380

566

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"])

385

567

self.changedstate = (multiprocessing_manager

386

568

.Condition(multiprocessing_manager

387

569

.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)

388

581

582

# Send notice to process children that client state has changed

389

583

def send_changedstate(self):

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

584

with self.changedstate:

585

self.changedstate.notify_all()

393

586

394

587

def enable(self):

395

588

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

396

589

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

397

590

# Already enabled

398

591

return

592

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

593

self.enabled = True

594

self.last_enabled = datetime.datetime.utcnow()

595

self.init_checker()

399

596

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):

400

622

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

401

623

# and every interval from then on.

624

if self.checker_initiator_tag is not None:

625

gobject.source_remove(self.checker_initiator_tag)

402

626

self.checker_initiator_tag = (gobject.timeout_add

403

627

(self.interval_milliseconds(),

404

628

self.start_checker))

405

629

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

406

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

630

if self.disable_initiator_tag is not None:

631

gobject.source_remove(self.disable_initiator_tag)

407

632

self.disable_initiator_tag = (gobject.timeout_add

408

633

(self.timeout_milliseconds(),

409

634

self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

412

635

# Also start a new checker *right now*.

413

636

self.start_checker()

414

637

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

441

638

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

442

639

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

443

640

self.checker_callback_tag = None

444

641

self.checker = None

445

642

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

643

self.last_checker_status = os.WEXITSTATUS(condition)

644

if self.last_checker_status == 0:

448

645

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

449

646

vars(self))

450

647

self.checked_ok()

452

649

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

453

650

vars(self))

454

651

else:

652

self.last_checker_status = -1

455

653

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

456

654

vars(self))

457

655

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

"""

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."""

464

664

if timeout is None:

465

665

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

self.disable_initiator_tag = (gobject.timeout_add

469

(_timedelta_to_milliseconds

470

(timeout), self.disable))

471

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

666

if self.disable_initiator_tag is not None:

667

gobject.source_remove(self.disable_initiator_tag)

668

self.disable_initiator_tag = None

669

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

670

self.disable_initiator_tag = (gobject.timeout_add

671

(timedelta_to_milliseconds

672

(timeout), self.disable))

673

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

472

674

473

675

def need_approval(self):

474

676

self.last_approval_request = datetime.datetime.utcnow()

479

681

If a checker already exists, leave it running and do

480

682

nothing."""

481

683

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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

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

486

688

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

487

689

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

488

690

# should be.

490

692

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

491

693

try:

492

694

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

493

except (AttributeError, OSError) as error:

494

if (isinstance(error, OSError)

495

and error.errno != errno.ECHILD):

496

raise error

695

except AttributeError:

696

pass

697

except OSError as error:

698

if error.errno != errno.ECHILD:

699

raise

497

700

else:

498

701

if pid:

499

702

logger.warning("Checker was a zombie")

502

705

self.current_checker_command)

503

706

# Start a new checker if needed

504

707

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)

505

713

try:

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

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

524

719

self.current_checker_command = command

525

720

try:

526

721

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

529

724

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

530

725

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

531

726

# 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 })

532

735

self.checker = subprocess.Popen(command,

533

736

close_fds=True,

534

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

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:

541

750

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

545

751

except OSError as error:

546

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

547

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

761

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

549

762

return True

550

763

557

770

return

558

771

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

559

772

try:

560

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

773

self.checker.terminate()

561

774

#time.sleep(0.5)

562

775

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

563

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

776

# self.checker.kill()

564

777

except OSError as error:

565

778

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

566

779

raise

583

796

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

584

797

if byte_arrays and signature != "ay":

585

798

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

586

" signature %r" % signature)

799

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

587

800

def decorator(func):

588

801

func._dbus_is_property = True

589

802

func._dbus_interface = dbus_interface

597

810

return decorator

598

811

599

812

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

600

850

class DBusPropertyException(dbus.exceptions.DBusException):

601

851

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

602

852

"""

625

875

"""

626

876

627

877

@staticmethod

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

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

886

631

def _get_all_dbus_properties(self):

887

def _get_all_dbus_things(self, thing):

632

888

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

633

889

"""

634

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

890

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

891

name),

892

athing.__get__(self))

635

893

for cls in self.__class__.__mro__

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

894

for name, athing in

895

inspect.getmembers(cls,

896

self._is_dbus_thing(thing)))

638

897

639

898

def _get_dbus_property(self, interface_name, property_name):

640

899

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

642

901

"""

643

902

for cls in self.__class__.__mro__:

644

903

for name, value in (inspect.getmembers

645

(cls, self._is_dbus_property)):

904

(cls,

905

self._is_dbus_thing("property"))):

646

906

if (value._dbus_name == property_name

647

907

and value._dbus_interface == interface_name):

648

908

return value.__get__(self)

676

936

# The byte_arrays option is not supported yet on

677

937

# signatures other than "ay".

678

938

if prop._dbus_signature != "ay":

679

raise ValueError

680

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

681

for byte in value))

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))

682

944

prop(value)

683

945

684

946

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

689

951

690

952

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

691

953

"""

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

954

properties = {}

955

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

694

956

if (interface_name

695

957

and interface_name != prop._dbus_interface):

696

958

# Interface non-empty but did not match

700

962

continue

701

963

value = prop()

702

964

if not hasattr(value, "variant_level"):

703

all[name] = value

965

properties[name] = value

704

966

continue

705

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

706

value.variant_level+1)

707

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

967

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

968

value.variant_level+1)

969

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

708

970

709

971

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

710

972

out_signature="s",

711

973

path_keyword='object_path',

712

974

connection_keyword='connection')

713

975

def Introspect(self, object_path, connection):

714

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

976

"""Overloading of standard D-Bus method.

977

978

Inserts property tags and interface annotation tags.

715

979

"""

716

980

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

717

981

connection)

724

988

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

725

989

return e

726

990

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

991

# Add property tags

727

992

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

728

993

for name, prop

729

in self._get_all_dbus_properties()

994

in self._get_all_dbus_things("property")

730

995

if prop._dbus_interface

731

996

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

732

997

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)

733

1029

# Add the names to the return values for the

734

1030

# "org.freedesktop.DBus.Properties" methods

735

1031

if (if_tag.getAttribute("name")

750

1046

except (AttributeError, xml.dom.DOMException,

751

1047

xml.parsers.expat.ExpatError) as error:

752

1048

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

753

error)

1049

exc_info=error)

754

1050

return xmlstring

755

1051

756

1052

757

def datetime_to_dbus (dt, variant_level=0):

1053

def datetime_to_dbus(dt, variant_level=0):

758

1054

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

759

1055

if dt is None:

760

1056

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

761

1057

return dbus.String(dt.isoformat(),

762

1058

variant_level=variant_level)

763

1059

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

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).

768

1083

"""

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

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):

776

1091

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

777

1092

# with the wrong interface name

778

1093

if (not hasattr(attribute, "_dbus_interface")

779

1094

or not attribute._dbus_interface

780

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

1095

.startswith(orig_interface_name)):

781

1096

continue

782

1097

# Create an alternate D-Bus interface name based on

783

1098

# the current name

784

1099

alt_interface = (attribute._dbus_interface

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1100

.replace(orig_interface_name,

1101

alt_interface_name))

1102

interface_names.add(alt_interface)

787

1103

# Is this a D-Bus signal?

788

1104

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

789

# Extract the original non-method function by

790

# black magic

1105

# Extract the original non-method undecorated

1106

# function by black magic

791

1107

nonmethod_func = (dict(

792

1108

zip(attribute.func_code.co_freevars,

793

1109

attribute.__closure__))["func"]

804

1120

nonmethod_func.func_name,

805

1121

nonmethod_func.func_defaults,

806

1122

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

807

1129

# Define a creator of a function to call both the

808

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

809

# signals gets sent when the function is called

1130

# original and alternate functions, so both the

1131

# original and alternate signals gets sent when

1132

# the function is called

810

1133

def fixscope(func1, func2):

811

1134

"""This function is a scope container to pass

812

1135

func1 and func2 to the "call_both" function

819

1142

return call_both

820

1143

# Create the "call_both" function and add it to

821

1144

# the class

822

attr[attrname] = fixscope(attribute,

823

new_function)

1145

attr[attrname] = fixscope(attribute, new_function)

824

1146

# Is this a D-Bus method?

825

1147

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

826

1148

# Create a new, but exactly alike, function

837

1159

attribute.func_name,

838

1160

attribute.func_defaults,

839

1161

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

840

1168

# Is this a D-Bus property?

841

1169

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

842

1170

# Create a new, but exactly alike, function

856

1184

attribute.func_name,

857

1185

attribute.func_defaults,

858

1186

attribute.func_closure)))

859

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

860

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

1232

class ClientDBus(Client, DBusObjectWithProperties):

862

1233

"""A Client class using D-Bus

863

1234

872

1243

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

873

1244

874

1245

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

875

self._approvals_pending = 0

876

1246

self.bus = bus

877

1247

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

878

1248

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

884

1254

("/clients/" + client_object_name))

885

1255

DBusObjectWithProperties.__init__(self, self.bus,

886

1256

self.dbus_object_path)

887

1257

888

1258

def notifychangeproperty(transform_func,

889

1259

dbus_name, type_func=lambda x: x,

890

1260

variant_level=1):

891

1261

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

892

1262

its changes to DBus.

893

1263

894

1264

transform_fun: Function that takes a value and a variant_level

895

1265

and transforms it to a D-Bus type.

896

1266

dbus_name: D-Bus name of the variable

913

1283

914

1284

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

915

1285

916

917

1286

expires = notifychangeproperty(datetime_to_dbus, "Expires")

918

1287

approvals_pending = notifychangeproperty(dbus.Boolean,

919

1288

"ApprovalPending",

926

1295

checker is not None)

927

1296

last_checked_ok = notifychangeproperty(datetime_to_dbus,

928

1297

"LastCheckedOK")

1298

last_checker_status = notifychangeproperty(dbus.Int16,

1299

"LastCheckerStatus")

929

1300

last_approval_request = notifychangeproperty(

930

1301

datetime_to_dbus, "LastApprovalRequest")

931

1302

approved_by_default = notifychangeproperty(dbus.Boolean,

932

1303

"ApprovedByDefault")

933

approval_delay = notifychangeproperty(dbus.UInt16,

1304

approval_delay = notifychangeproperty(dbus.UInt64,

934

1305

"ApprovalDelay",

935

1306

type_func =

936

_timedelta_to_milliseconds)

1307

timedelta_to_milliseconds)

937

1308

approval_duration = notifychangeproperty(

938

dbus.UInt16, "ApprovalDuration",

939

type_func = _timedelta_to_milliseconds)

1309

dbus.UInt64, "ApprovalDuration",

1310

type_func = timedelta_to_milliseconds)

940

1311

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

941

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

1312

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

942

1313

type_func =

943

_timedelta_to_milliseconds)

1314

timedelta_to_milliseconds)

944

1315

extended_timeout = notifychangeproperty(

945

dbus.UInt16, "ExtendedTimeout",

946

type_func = _timedelta_to_milliseconds)

947

interval = notifychangeproperty(dbus.UInt16,

1316

dbus.UInt64, "ExtendedTimeout",

1317

type_func = timedelta_to_milliseconds)

1318

interval = notifychangeproperty(dbus.UInt64,

948

1319

"Interval",

949

1320

type_func =

950

_timedelta_to_milliseconds)

1321

timedelta_to_milliseconds)

951

1322

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

952

1323

953

1324

del notifychangeproperty

981

1352

*args, **kwargs)

982

1353

983

1354

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

984

old_checker = self.checker

985

if self.checker is not None:

986

old_checker_pid = self.checker.pid

987

else:

988

old_checker_pid = None

1355

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

989

1356

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

990

1357

# Only if new checker process was started

991

1358

if (self.checker is not None

995

1362

return r

996

1363

997

1364

def _reset_approved(self):

998

self._approved = None

1365

self.approved = None

999

1366

return False

1000

1367

1001

1368

def approve(self, value=True):

1002

self.send_changedstate()

1003

self._approved = value

1004

gobject.timeout_add(_timedelta_to_milliseconds

1369

self.approved = value

1370

gobject.timeout_add(timedelta_to_milliseconds

1005

1371

(self.approval_duration),

1006

1372

self._reset_approved)

1007

1373

self.send_changedstate()

1008

1374

1009

1375

## D-Bus methods, signals & properties

1010

1376

_interface = "se.recompile.Mandos.Client"

1011

1377

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1012

1385

## Signals

1013

1386

1014

1387

# CheckerCompleted - signal

1113

1486

access="readwrite")

1114

1487

def ApprovalDuration_dbus_property(self, value=None):

1115

1488

if value is None: # get

1116

return dbus.UInt64(_timedelta_to_milliseconds(

1489

return dbus.UInt64(timedelta_to_milliseconds(

1117

1490

self.approval_duration))

1118

1491

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

1119

1492

1133

1506

def Host_dbus_property(self, value=None):

1134

1507

if value is None: # get

1135

1508

return dbus.String(self.host)

1136

self.host = value

1509

self.host = unicode(value)

1137

1510

1138

1511

# Created - property

1139

1512

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

1140

1513

def Created_dbus_property(self):

1141

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

1514

return datetime_to_dbus(self.created)

1142

1515

1143

1516

# LastEnabled - property

1144

1517

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

1165

1538

return

1166

1539

return datetime_to_dbus(self.last_checked_ok)

1167

1540

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

1168

1547

# Expires - property

1169

1548

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

1170

1549

def Expires_dbus_property(self):

1181

1560

def Timeout_dbus_property(self, value=None):

1182

1561

if value is None: # get

1183

1562

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1184

1564

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

1185

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

1186

return

1187

# Reschedule timeout

1188

gobject.source_remove(self.disable_initiator_tag)

1189

self.disable_initiator_tag = None

1190

self.expires = None

1191

time_to_die = _timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow())

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

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))

1205

1581

1206

1582

# ExtendedTimeout - property

1207

1583

@dbus_service_property(_interface, signature="t",

1220

1596

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

1221

1597

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

1222

1598

return

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

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

1228

1605

1229

1606

# Checker - property

1230

1607

@dbus_service_property(_interface, signature="s",

1232

1609

def Checker_dbus_property(self, value=None):

1233

1610

if value is None: # get

1234

1611

return dbus.String(self.checker_command)

1235

self.checker_command = value

1612

self.checker_command = unicode(value)

1236

1613

1237

1614

# CheckerRunning - property

1238

1615

@dbus_service_property(_interface, signature="b",

1267

1644

raise KeyError()

1268

1645

1269

1646

def __getattribute__(self, name):

1270

if(name == '_pipe'):

1647

if name == '_pipe':

1271

1648

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

1272

1649

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

1273

1650

data = self._pipe.recv()

1280

1657

return func

1281

1658

1282

1659

def __setattr__(self, name, value):

1283

if(name == '_pipe'):

1660

if name == '_pipe':

1284

1661

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

1285

1662

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

1286

1663

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1289

1664

1290

1665

class ClientHandler(socketserver.BaseRequestHandler, object):

1291

1666

"""A class to handle client connections.

1328

1703

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

1329

1704

try:

1330

1705

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

1331

raise RuntimeError

1706

raise RuntimeError(line)

1332

1707

except (ValueError, IndexError, RuntimeError) as error:

1333

1708

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

1334

1709

return

1374

1749

client.Rejected("Disabled")

1375

1750

return

1376

1751

1377

if client._approved or not client.approval_delay:

1752

if client.approved or not client.approval_delay:

1378

1753

#We are approved or approval is disabled

1379

1754

break

1380

elif client._approved is None:

1755

elif client.approved is None:

1381

1756

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

1382

1757

client.name)

1383

1758

if self.server.use_dbus:

1396

1771

#wait until timeout or approved

1397

1772

time = datetime.datetime.now()

1398

1773

client.changedstate.acquire()

1399

(client.changedstate.wait

1400

(float(client._timedelta_to_milliseconds(delay)

1401

/ 1000)))

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1402

1777

client.changedstate.release()

1403

1778

time2 = datetime.datetime.now()

1404

1779

if (time2 - time) >= delay:

1420

1795

try:

1421

1796

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

1422

1797

except gnutls.errors.GNUTLSError as error:

1423

logger.warning("gnutls send failed")

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1424

1800

return

1425

1801

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

1426

1802

sent, len(client.secret)

1429

1805

1430

1806

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

1431

1807

# bump the timeout using extended_timeout

1432

client.checked_ok(client.extended_timeout)

1808

client.bump_timeout(client.extended_timeout)

1433

1809

if self.server.use_dbus:

1434

1810

# Emit D-Bus signal

1435

1811

client.GotSecret()

1440

1816

try:

1441

1817

session.bye()

1442

1818

except gnutls.errors.GNUTLSError as error:

1443

logger.warning("GnuTLS bye failed")

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1444

1821

1445

1822

@staticmethod

1446

1823

def peer_certificate(session):

1502

1879

# Convert the buffer to a Python bytestring

1503

1880

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

1504

1881

# Convert the bytestring to hexadecimal notation

1505

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

1882

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

1506

1883

return hex_fpr

1507

1884

1508

1885

1511

1888

def sub_process_main(self, request, address):

1512

1889

try:

1513

1890

self.finish_request(request, address)

1514

except:

1891

except Exception:

1515

1892

self.handle_error(request, address)

1516

1893

self.close_request(request)

1517

1894

1518

1895

def process_request(self, request, address):

1519

1896

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

1520

1897

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

1521

args = (request,

1522

address))

1898

args = (request, address))

1523

1899

proc.start()

1524

1900

return proc

1525

1901

1540

1916

1541

1917

def add_pipe(self, parent_pipe, proc):

1542

1918

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

1543

raise NotImplementedError

1919

raise NotImplementedError()

1544

1920

1545

1921

1546

1922

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1553

1929

use_ipv6: Boolean; to use IPv6 or not

1554

1930

"""

1555

1931

def __init__(self, server_address, RequestHandlerClass,

1556

interface=None, use_ipv6=True):

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

"""

1557

1936

self.interface = interface

1558

1937

if use_ipv6:

1559

1938

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.

1560

1965

socketserver.TCPServer.__init__(self, server_address,

1561

1966

RequestHandlerClass)

1967

1562

1968

def server_bind(self):

1563

1969

"""This overrides the normal server_bind() function

1564

1970

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

1572

1978

try:

1573

1979

self.socket.setsockopt(socket.SOL_SOCKET,

1574

1980

SO_BINDTODEVICE,

1575

str(self.interface

1576

+ '\0'))

1981

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

1577

1982

except socket.error as error:

1578

if error[0] == errno.EPERM:

1579

logger.error("No permission to"

1580

" bind to interface %s",

1581

self.interface)

1582

elif error[0] == errno.ENOPROTOOPT:

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:

1583

1987

logger.error("SO_BINDTODEVICE not available;"

1584

1988

" cannot bind to interface %s",

1585

1989

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1586

1993

else:

1587

1994

raise

1588

1995

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

1591

1998

if self.address_family == socket.AF_INET6:

1592

1999

any_address = "::" # in6addr_any

1593

2000

else:

1594

any_address = socket.INADDR_ANY

2001

any_address = "0.0.0.0" # INADDR_ANY

1595

2002

self.server_address = (any_address,

1596

2003

self.server_address[1])

1597

2004

elif not self.server_address[1]:

1618

2025

"""

1619

2026

def __init__(self, server_address, RequestHandlerClass,

1620

2027

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

1621

gnutls_priority=None, use_dbus=True):

2028

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

1622

2029

self.enabled = False

1623

2030

self.clients = clients

1624

2031

if self.clients is None:

1625

self.clients = set()

2032

self.clients = {}

1626

2033

self.use_dbus = use_dbus

1627

2034

self.gnutls_priority = gnutls_priority

1628

2035

IPv6_TCPServer.__init__(self, server_address,

1629

2036

RequestHandlerClass,

1630

2037

interface = interface,

1631

use_ipv6 = use_ipv6)

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1632

2040

def server_activate(self):

1633

2041

if self.enabled:

1634

2042

return socketserver.TCPServer.server_activate(self)

1647

2055

1648

2056

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

1649

2057

proc = None, client_object=None):

1650

condition_names = {

1651

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

1652

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

1653

# blocking).

1654

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

1655

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

1656

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

1657

# broken, usually for pipes and

1658

# sockets).

1659

}

1660

conditions_string = ' | '.join(name

1661

for cond, name in

1662

condition_names.iteritems()

1663

if cond & condition)

1664

2058

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

1665

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

2059

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

1666

2060

# Wait for other process to exit

1667

2061

proc.join()

1668

2062

return False

1675

2069

fpr = request[1]

1676

2070

address = request[2]

1677

2071

1678

for c in self.clients:

2072

for c in self.clients.itervalues():

1679

2073

if c.fingerprint == fpr:

1680

2074

client = c

1681

2075

break

1726

2120

return True

1727

2121

1728

2122

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

1729

2222

def string_to_delta(interval):

1730

2223

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

1731

2224

1742

2235

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

1743

2236

datetime.timedelta(0, 330)

1744

2237

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

1745

2244

timevalue = datetime.timedelta(0)

1746

2245

for s in interval.split():

1747

2246

try:

1758

2257

elif suffix == "w":

1759

2258

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

1760

2259

else:

1761

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

1762

except (ValueError, IndexError) as e:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1763

2263

raise ValueError(*(e.args))

1764

2264

timevalue += delta

1765

2265

return timevalue

1766

2266

1767

2267

1768

def if_nametoindex(interface):

1769

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

1770

1771

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

1772

global if_nametoindex

1773

try:

1774

if_nametoindex = (ctypes.cdll.LoadLibrary

1775

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

1776

.if_nametoindex)

1777

except (OSError, AttributeError):

1778

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

1779

def if_nametoindex(interface):

1780

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

1781

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

1782

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

1783

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1784

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

1785

interface))

1786

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

1787

ifreq[16:20])[0]

1788

return interface_index

1789

return if_nametoindex(interface)

1790

1791

1792

2268

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

1793

2269

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

1794

2270

1802

2278

sys.exit()

1803

2279

if not noclose:

1804

2280

# Close all standard open file descriptors

1805

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

2281

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

1806

2282

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

1807

2283

raise OSError(errno.ENODEV,

1808

"%s not a character device"

1809

% os.path.devnull)

2284

"{0} not a character device"

2285

.format(os.devnull))

1810

2286

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

1811

2287

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

1812

2288

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

1821

2297

1822

2298

parser = argparse.ArgumentParser()

1823

2299

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

1824

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

2300

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

1825

2301

help="show version number and exit")

1826

2302

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

1827

2303

help="Bind to interface IF")

1833

2309

help="Run self-test")

1834

2310

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

1835

2311

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

1836

" to terminal")

2312

" to terminal", default=None)

1837

2313

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

1838

2314

help="Debug level for stdout output")

1839

2315

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

1846

2322

" files")

1847

2323

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

1848

2324

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

1849

" system bus interface")

2325

" system bus interface", default=None)

1850

2326

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

1851

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

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

1852

2340

options = parser.parse_args()

1853

2341

1854

2342

if options.check:

1855

2343

import doctest

1856

doctest.testmod()

1857

sys.exit()

2344

fail_count, test_count = doctest.testmod()

2345

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

1858

2346

1859

2347

# Default values for config file for server-global settings

1860

2348

server_defaults = { "interface": "",

1862

2350

"port": "",

1863

2351

"debug": "False",

1864

2352

"priority":

1865

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

2353

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

1866

2354

"servicename": "Mandos",

1867

2355

"use_dbus": "True",

1868

2356

"use_ipv6": "True",

1869

2357

"debuglevel": "",

2358

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

1870

2362

}

1871

2363

1872

2364

# Parse config file for server-global settings

1877

2369

# Convert the SafeConfigParser object to a dict

1878

2370

server_settings = server_config.defaults()

1879

2371

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

1880

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

2372

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

1881

2373

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

1882

2374

option)

1883

2375

if server_settings["port"]:

1884

2376

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

1885

2377

"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"])

1886

2387

del server_config

1887

2388

1888

2389

# Override the settings from the config file with command line

1889

2390

# options, if set.

1890

2391

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

1891

2392

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

1892

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

2393

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

2394

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

1893

2395

value = getattr(options, option)

1894

2396

if value is not None:

1895

2397

server_settings[option] = value

1898

2400

for option in server_settings.keys():

1899

2401

if type(server_settings[option]) is str:

1900

2402

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

1901

2410

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

1902

2411

1903

2412

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

1907

2416

debuglevel = server_settings["debuglevel"]

1908

2417

use_dbus = server_settings["use_dbus"]

1909

2418

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)

1910

2431

1911

2432

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

1912

2433

syslogger.setFormatter(logging.Formatter

1913

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

1914

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

1915

% server_settings["servicename"]))

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

1916

2438

1917

2439

# Parse config file with clients

1918

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

1919

"extended_timeout": "15m",

1920

"interval": "2m",

1921

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

1922

"host": "",

1923

"approval_delay": "0s",

1924

"approval_duration": "1s",

1925

}

1926

client_config = configparser.SafeConfigParser(client_defaults)

2440

client_config = configparser.SafeConfigParser(Client

2441

.client_defaults)

1927

2442

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

1928

2443

"clients.conf"))

1929

2444

1938

2453

use_ipv6=use_ipv6,

1939

2454

gnutls_priority=

1940

2455

server_settings["priority"],

1941

use_dbus=use_dbus)

1942

if not debug:

1943

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

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

1944

2464

try:

1945

2465

pidfile = open(pidfilename, "w")

1946

except IOError:

1947

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

2466

except IOError as e:

2467

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

2468

exc_info=e)

1948

2469

1949

try:

1950

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

1951

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

1952

except KeyError:

2470

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

1953

2471

try:

1954

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

1955

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

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

1956

2475

except KeyError:

1957

try:

1958

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

1959

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

1960

except KeyError:

1961

uid = 65534

1962

gid = 65534

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

1963

2480

try:

1964

2481

os.setgid(gid)

1965

2482

os.setuid(uid)

1966

2483

except OSError as error:

1967

if error[0] != errno.EPERM:

1968

raise error

1969

1970

if not debug and not debuglevel:

1971

syslogger.setLevel(logging.WARNING)

1972

console.setLevel(logging.WARNING)

1973

if debuglevel:

1974

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

1975

syslogger.setLevel(level)

1976

console.setLevel(level)

2484

if error.errno != errno.EPERM:

2485

raise

1977

2486

1978

2487

if debug:

1979

2488

# Enable all possible GnuTLS debugging

1990

2499

.gnutls_global_set_log_function(debug_gnutls))

1991

2500

1992

2501

# Redirect stdin so all checkers get /dev/null

1993

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

2502

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

1994

2503

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

1995

2504

if null > 2:

1996

2505

os.close(null)

1997

else:

1998

# No console logging

1999

logger.removeHandler(console)

2000

2506

2001

2507

# Need to fork before connecting to D-Bus

2002

if not debug:

2508

if not foreground:

2003

2509

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

2004

2510

daemon()

2005

2511

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

2006

2516

global main_loop

2007

2517

# From the Avahi example code

2008

DBusGMainLoop(set_as_default=True )

2518

DBusGMainLoop(set_as_default=True)

2009

2519

main_loop = gobject.MainLoop()

2010

2520

bus = dbus.SystemBus()

2011

2521

# End of Avahi example code

2017

2527

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

2018

2528

do_not_queue=True))

2019

2529

except dbus.exceptions.NameExistsException as e:

2020

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

2530

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

2021

2531

use_dbus = False

2022

2532

server_settings["use_dbus"] = False

2023

2533

tcp_server.use_dbus = False

2024

2534

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2025

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

2026

servicetype = "_mandos._tcp",

2027

protocol = protocol, bus = bus)

2535

service = AvahiServiceToSyslog(name =

2536

server_settings["servicename"],

2537

servicetype = "_mandos._tcp",

2538

protocol = protocol, bus = bus)

2028

2539

if server_settings["interface"]:

2029

2540

service.interface = (if_nametoindex

2030

2541

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

2034

2545

2035

2546

client_class = Client

2036

2547

if use_dbus:

2037

client_class = functools.partial(ClientDBusTransitional,

2038

bus = bus)

2039

def client_config_items(config, section):

2040

special_settings = {

2041

"approved_by_default":

2042

lambda: config.getboolean(section,

2043

"approved_by_default"),

2044

}

2045

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

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))

2046

2631

try:

2047

yield (name, special_settings[name]())

2048

except KeyError:

2049

yield (name, value)

2050

2051

tcp_server.clients.update(set(

2052

client_class(name = section,

2053

config= dict(client_config_items(

2054

client_config, section)))

2055

for section in client_config.sections()))

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

2056

2657

if not tcp_server.clients:

2057

2658

logger.warning("No clients defined")

2058

2059

if not debug:

2060

try:

2061

with pidfile:

2062

pid = os.getpid()

2063

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

2064

del pidfile

2065

except IOError:

2066

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

2067

pidfilename, pid)

2068

except NameError:

2069

# "pidfile" was never created

2070

pass

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

2071

2670

del pidfilename

2072

2073

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

2074

2671

2075

2672

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

2076

2673

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

2077

2674

2078

2675

if use_dbus:

2079

class MandosDBusService(dbus.service.Object):

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2080

2679

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

2081

2680

def __init__(self):

2082

2681

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

2083

2682

_interface = "se.recompile.Mandos"

2084

2683

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2085

2690

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

2086

2691

def ClientAdded(self, objpath):

2087

2692

"D-Bus signal"

2101

2706

def GetAllClients(self):

2102

2707

"D-Bus method"

2103

2708

return dbus.Array(c.dbus_object_path

2104

for c in tcp_server.clients)

2709

for c in

2710

tcp_server.clients.itervalues())

2105

2711

2106

2712

@dbus.service.method(_interface,

2107

2713

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

2109

2715

"D-Bus method"

2110

2716

return dbus.Dictionary(

2111

2717

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

2112

for c in tcp_server.clients),

2718

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

2113

2719

signature="oa{sv}")

2114

2720

2115

2721

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

2116

2722

def RemoveClient(self, object_path):

2117

2723

"D-Bus method"

2118

for c in tcp_server.clients:

2724

for c in tcp_server.clients.itervalues():

2119

2725

if c.dbus_object_path == object_path:

2120

tcp_server.clients.remove(c)

2726

del tcp_server.clients[c.name]

2121

2727

c.remove_from_connection()

2122

2728

# Don't signal anything except ClientRemoved

2123

2729

c.disable(quiet=True)

2128

2734

2129

2735

del _interface

2130

2736

2131

class MandosDBusServiceTransitional(MandosDBusService):

2132

__metaclass__ = AlternateDBusNamesMetaclass

2133

mandos_dbus_service = MandosDBusServiceTransitional()

2737

mandos_dbus_service = MandosDBusService()

2134

2738

2135

2739

def cleanup():

2136

2740

"Cleanup function; run on exit"

2137

2741

service.cleanup()

2138

2742

2139

2743

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

2140

2799

while tcp_server.clients:

2141

client = tcp_server.clients.pop()

2800

name, client = tcp_server.clients.popitem()

2142

2801

if use_dbus:

2143

2802

client.remove_from_connection()

2144

client.disable_hook = None

2145

2803

# Don't signal anything except ClientRemoved

2146

2804

client.disable(quiet=True)

2147

2805

if use_dbus:

2149

2807

mandos_dbus_service.ClientRemoved(client

2150

2808

.dbus_object_path,

2151

2809

client.name)

2810

client_settings.clear()

2152

2811

2153

2812

atexit.register(cleanup)

2154

2813

2155

for client in tcp_server.clients:

2814

for client in tcp_server.clients.itervalues():

2156

2815

if use_dbus:

2157

2816

# Emit D-Bus signal

2158

2817

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2159

client.enable()

2818

# Need to initiate checking of clients

2819

if client.enabled:

2820

client.init_checker()

2160

2821

2161

2822

tcp_server.enable()

2162

2823

tcp_server.server_activate()

2165

2826

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

2166

2827

if use_ipv6:

2167

2828

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

2168

" flowinfo %d, scope_id %d"

2169

% tcp_server.socket.getsockname())

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2170

2831

else: # IPv4

2171

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

2172

% tcp_server.socket.getsockname())

2832

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

2833

*tcp_server.socket.getsockname())

2173

2834

2174

2835

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

2175

2836

2178

2839

try:

2179

2840

service.activate()

2180

2841

except dbus.exceptions.DBusException as error:

2181

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

2842

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

2182

2843

cleanup()

2183

2844

sys.exit(1)

2184

2845

# End of Avahi example code

2191

2852

logger.debug("Starting main loop")

2192

2853

main_loop.run()

2193

2854

except AvahiError as error:

2194

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

2855

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

2195

2856

cleanup()

2196

2857

sys.exit(1)

2197

2858

except KeyboardInterrupt:

2202

2863

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

2203

2864

cleanup()

2204

2865

2205

2206

2866

if __name__ == '__main__':

2207

2867

main()