/mandos/trunk : revision 505.3.4

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 = "1.6.2"

92

stored_state_file = "clients.pickle"

93

94

logger = logging.getLogger()

85

86

version = "1.4.1"

87

88

#logger = logging.getLogger('mandos')

89

logger = logging.Logger('mandos')

95

90

syslogger = (logging.handlers.SysLogHandler

96

91

(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

97

92

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

98

99

try:

100

if_nametoindex = (ctypes.cdll.LoadLibrary

101

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

102

.if_nametoindex)

103

except (OSError, AttributeError):

104

def if_nametoindex(interface):

105

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

106

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

107

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

108

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

109

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

110

interface))

111

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

112

ifreq[16:20])[0]

113

return interface_index

114

115

116

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

117

"""init logger and add loglevel"""

118

119

syslogger.setFormatter(logging.Formatter

120

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

121

' %(message)s'))

122

logger.addHandler(syslogger)

123

124

if debug:

125

console = logging.StreamHandler()

126

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

127

' [%(process)d]:'

128

' %(levelname)s:'

129

' %(message)s'))

130

logger.addHandler(console)

131

logger.setLevel(level)

132

133

134

class PGPError(Exception):

135

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

136

pass

137

138

139

class PGPEngine(object):

140

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

141

def __init__(self):

142

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

143

self.gnupgargs = ['--batch',

144

'--home', self.tempdir,

145

'--force-mdc',

146

'--quiet',

147

'--no-use-agent']

148

149

def __enter__(self):

150

return self

151

152

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

153

self._cleanup()

154

return False

155

156

def __del__(self):

157

self._cleanup()

158

159

def _cleanup(self):

160

if self.tempdir is not None:

161

# Delete contents of tempdir

162

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

163

topdown = False):

164

for filename in files:

165

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

166

for dirname in dirs:

167

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

168

# Remove tempdir

169

os.rmdir(self.tempdir)

170

self.tempdir = None

171

172

def password_encode(self, password):

173

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

174

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

175

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

176

if len(encoded) > 2048:

177

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

178

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

179

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

180

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

181

return encoded

182

183

def encrypt(self, data, password):

184

passphrase = self.password_encode(password)

185

with tempfile.NamedTemporaryFile(dir=self.tempdir

186

) as passfile:

187

passfile.write(passphrase)

188

passfile.flush()

189

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

190

'--passphrase-file',

191

passfile.name]

192

+ self.gnupgargs,

193

stdin = subprocess.PIPE,

194

stdout = subprocess.PIPE,

195

stderr = subprocess.PIPE)

196

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

197

if proc.returncode != 0:

198

raise PGPError(err)

199

return ciphertext

200

201

def decrypt(self, data, password):

202

passphrase = self.password_encode(password)

203

with tempfile.NamedTemporaryFile(dir = self.tempdir

204

) as passfile:

205

passfile.write(passphrase)

206

passfile.flush()

207

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

208

'--passphrase-file',

209

passfile.name]

210

+ self.gnupgargs,

211

stdin = subprocess.PIPE,

212

stdout = subprocess.PIPE,

213

stderr = subprocess.PIPE)

214

decrypted_plaintext, err = proc.communicate(input

215

= data)

216

if proc.returncode != 0:

217

raise PGPError(err)

218

return decrypted_plaintext

219

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)

220

103

221

104

class AvahiError(Exception):

222

105

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

240

123

Used to optionally bind to the specified interface.

241

124

name: string; Example: 'Mandos'

242

125

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

243

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

126

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

244

127

port: integer; what port to announce

245

128

TXT: list of strings; TXT record for the service

246

129

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

252

135

server: D-Bus Server

253

136

bus: dbus.SystemBus()

254

137

"""

255

256

138

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

257

139

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

258

140

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

271

153

self.server = None

272

154

self.bus = bus

273

155

self.entry_group_state_changed_match = None

274

275

156

def rename(self):

276

157

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

277

158

if self.rename_count >= self.max_renames:

283

164

.GetAlternativeServiceName(self.name))

284

165

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

285

166

self.name)

167

syslogger.setFormatter(logging.Formatter

168

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

169

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

170

% self.name))

286

171

self.remove()

287

172

try:

288

173

self.add()

289

174

except dbus.exceptions.DBusException as error:

290

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

175

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

291

176

self.cleanup()

292

177

os._exit(1)

293

178

self.rename_count += 1

294

295

179

def remove(self):

296

180

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

297

181

if self.entry_group_state_changed_match is not None:

299

183

self.entry_group_state_changed_match = None

300

184

if self.group is not None:

301

185

self.group.Reset()

302

303

186

def add(self):

304

187

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

305

188

self.remove()

310

193

avahi.DBUS_INTERFACE_ENTRY_GROUP)

311

194

self.entry_group_state_changed_match = (

312

195

self.group.connect_to_signal(

313

'StateChanged', self.entry_group_state_changed))

196

'StateChanged', self .entry_group_state_changed))

314

197

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

315

198

self.name, self.type)

316

199

self.group.AddService(

322

205

dbus.UInt16(self.port),

323

206

avahi.string_array_to_txt_array(self.TXT))

324

207

self.group.Commit()

325

326

208

def entry_group_state_changed(self, state, error):

327

209

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

328

210

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

335

217

elif state == avahi.ENTRY_GROUP_FAILURE:

336

218

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

337

219

unicode(error))

338

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

339

.format(error))

340

220

raise AvahiGroupError("State changed: %s"

221

% unicode(error))

341

222

def cleanup(self):

342

223

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

343

224

if self.group is not None:

344

225

try:

345

226

self.group.Free()

346

227

except (dbus.exceptions.UnknownMethodException,

347

dbus.exceptions.DBusException):

228

dbus.exceptions.DBusException) as e:

348

229

pass

349

230

self.group = None

350

231

self.remove()

351

352

232

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

353

233

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

354

234

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

373

253

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

374

254

else:

375

255

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

376

377

256

def activate(self):

378

257

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

379

258

if self.server is None:

387

266

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

388

267

389

268

390

class AvahiServiceToSyslog(AvahiService):

391

def rename(self):

392

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

393

ret = AvahiService.rename(self)

394

syslogger.setFormatter(logging.Formatter

395

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

396

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

397

.format(self.name)))

398

return ret

399

400

401

def timedelta_to_milliseconds(td):

269

def _timedelta_to_milliseconds(td):

402

270

"Convert a datetime.timedelta() to milliseconds"

403

271

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

404

272

+ (td.seconds * 1000)

405

273

+ (td.microseconds // 1000))

406

407

274

408

275

class Client(object):

409

276

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

410

277

411

278

Attributes:

412

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

279

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

413

280

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

414

281

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

415

282

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

422

289

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

423

290

checker_initiator_tag: a gobject event source tag, or None

424

291

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

425

client_structure: Object describing what attributes a client has

426

and is used for storing the client at exit

427

292

current_checker_command: string; current running checker_command

293

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

428

294

disable_initiator_tag: a gobject event source tag, or None

429

295

enabled: bool()

430

296

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

433

299

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

434

300

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

435

301

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

436

last_checker_status: integer between 0 and 255 reflecting exit

437

status of last checker. -1 reflects crashed

438

checker, -2 means no checker completed yet.

439

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

302

last_enabled: datetime.datetime(); (UTC)

440

303

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

441

304

D-Bus identifiers

442

305

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

443

306

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

444

307

until this client is disabled

445

extended_timeout: extra long timeout when secret has been sent

308

extended_timeout: extra long timeout when password has been sent

446

309

runtime_expansions: Allowed attributes for runtime expansion.

447

310

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

448

311

disabled, or None

449

server_settings: The server_settings dict from main()

450

312

"""

451

313

452

314

runtime_expansions = ("approval_delay", "approval_duration",

453

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

454

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

455

"last_approval_request", "last_checked_ok",

315

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

316

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

456

317

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

457

client_defaults = { "timeout": "PT5M",

458

"extended_timeout": "PT15M",

459

"interval": "PT2M",

460

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

461

"host": "",

462

"approval_delay": "PT0S",

463

"approval_duration": "PT1S",

464

"approved_by_default": "True",

465

"enabled": "True",

466

}

467

318

468

319

def timeout_milliseconds(self):

469

320

"Return the 'timeout' attribute in milliseconds"

470

return timedelta_to_milliseconds(self.timeout)

321

return _timedelta_to_milliseconds(self.timeout)

471

322

472

323

def extended_timeout_milliseconds(self):

473

324

"Return the 'extended_timeout' attribute in milliseconds"

474

return timedelta_to_milliseconds(self.extended_timeout)

325

return _timedelta_to_milliseconds(self.extended_timeout)

475

326

476

327

def interval_milliseconds(self):

477

328

"Return the 'interval' attribute in milliseconds"

478

return timedelta_to_milliseconds(self.interval)

329

return _timedelta_to_milliseconds(self.interval)

479

330

480

331

def approval_delay_milliseconds(self):

481

return timedelta_to_milliseconds(self.approval_delay)

482

483

@staticmethod

484

def config_parser(config):

485

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

486

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

487

with exceptions for any special settings as defined above.

488

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

489

value given the same arguments.

490

"""

491

settings = {}

492

for client_name in config.sections():

493

section = dict(config.items(client_name))

494

client = settings[client_name] = {}

495

496

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

497

# Reformat values from string types to Python types

498

client["approved_by_default"] = config.getboolean(

499

client_name, "approved_by_default")

500

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

501

"enabled")

502

503

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

504

.replace(" ", ""))

505

if "secret" in section:

506

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

507

elif "secfile" in section:

508

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

509

(section["secfile"])),

510

"rb") as secfile:

511

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

512

else:

513

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

514

.format(section))

515

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

516

client["extended_timeout"] = string_to_delta(

517

section["extended_timeout"])

518

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

519

client["approval_delay"] = string_to_delta(

520

section["approval_delay"])

521

client["approval_duration"] = string_to_delta(

522

section["approval_duration"])

523

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

524

client["last_approval_request"] = None

525

client["last_checked_ok"] = None

526

client["last_checker_status"] = -2

527

528

return settings

529

530

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."""

531

338

self.name = name

532

if server_settings is None:

533

server_settings = {}

534

self.server_settings = server_settings

535

# adding all client settings

536

for setting, value in settings.iteritems():

537

setattr(self, setting, value)

538

539

if self.enabled:

540

if not hasattr(self, "last_enabled"):

541

self.last_enabled = datetime.datetime.utcnow()

542

if not hasattr(self, "expires"):

543

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

544

+ self.timeout)

545

else:

546

self.last_enabled = None

547

self.expires = None

548

339

if config is None:

340

config = {}

549

341

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

550

342

# Uppercase and remove spaces from fingerprint for later

551

343

# comparison purposes with return value from the fingerprint()

552

344

# function

345

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

346

.replace(" ", ""))

553

347

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

554

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

555

datetime.datetime.utcnow())

556

557

# 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

558

369

self.checker = None

559

370

self.checker_initiator_tag = None

560

371

self.disable_initiator_tag = None

372

self.expires = None

561

373

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

562

375

self.current_checker_command = None

563

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

564

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"])

565

385

self.changedstate = (multiprocessing_manager

566

386

.Condition(multiprocessing_manager

567

387

.Lock()))

568

self.client_structure = [attr for attr in

569

self.__dict__.iterkeys()

570

if not attr.startswith("_")]

571

self.client_structure.append("client_structure")

572

573

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

574

lambda obj:

575

isinstance(obj,

576

property)):

577

if not name.startswith("_"):

578

self.client_structure.append(name)

579

388

580

# Send notice to process children that client state has changed

581

389

def send_changedstate(self):

582

with self.changedstate:

583

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

584

393

585

394

def enable(self):

586

395

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

587

396

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

588

397

# Already enabled

589

398

return

590

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

591

self.enabled = True

592

self.last_enabled = datetime.datetime.utcnow()

593

self.init_checker()

594

399

self.send_changedstate()

595

596

def disable(self, quiet=True):

597

"""Disable this client."""

598

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

599

return False

600

if not quiet:

601

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

602

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

603

gobject.source_remove(self.disable_initiator_tag)

604

self.disable_initiator_tag = None

605

self.expires = None

606

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

607

gobject.source_remove(self.checker_initiator_tag)

608

self.checker_initiator_tag = None

609

self.stop_checker()

610

self.enabled = False

611

if not quiet:

612

self.send_changedstate()

613

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

614

return False

615

616

def __del__(self):

617

self.disable()

618

619

def init_checker(self):

620

400

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

621

401

# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

624

402

self.checker_initiator_tag = (gobject.timeout_add

625

403

(self.interval_milliseconds(),

626

404

self.start_checker))

627

405

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

406

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

630

407

self.disable_initiator_tag = (gobject.timeout_add

631

408

(self.timeout_milliseconds(),

632

409

self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

633

412

# Also start a new checker *right now*.

634

413

self.start_checker()

635

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

636

441

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

637

442

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

638

443

self.checker_callback_tag = None

639

444

self.checker = None

640

445

if os.WIFEXITED(condition):

641

self.last_checker_status = os.WEXITSTATUS(condition)

642

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

643

448

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

644

449

vars(self))

645

450

self.checked_ok()

647

452

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

648

453

vars(self))

649

454

else:

650

self.last_checker_status = -1

651

455

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

652

456

vars(self))

653

457

654

def checked_ok(self):

655

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

656

self.last_checked_ok = datetime.datetime.utcnow()

657

self.last_checker_status = 0

658

self.bump_timeout()

659

660

def bump_timeout(self, timeout=None):

661

"""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

"""

662

464

if timeout is None:

663

465

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

664

467

if self.disable_initiator_tag is not None:

665

468

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

667

469

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

668

470

self.disable_initiator_tag = (gobject.timeout_add

669

(timedelta_to_milliseconds

471

(_timedelta_to_milliseconds

670

472

(timeout), self.disable))

671

473

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

672

474

679

481

If a checker already exists, leave it running and do

680

482

nothing."""

681

483

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

# 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

686

488

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

687

489

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

688

490

# should be.

690

492

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

691

493

try:

692

494

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

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

495

except (AttributeError, OSError) as error:

496

if (isinstance(error, OSError)

497

and error.errno != errno.ECHILD):

498

raise error

698

499

else:

699

500

if pid:

700

501

logger.warning("Checker was a zombie")

703

504

self.current_checker_command)

704

505

# Start a new checker if needed

705

506

if self.checker is None:

706

# Escape attributes for the shell

707

escaped_attrs = dict(

708

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

709

for attr in

710

self.runtime_expansions)

711

507

try:

712

command = self.checker_command % escaped_attrs

713

except TypeError as error:

714

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

715

self.checker_command, exc_info=error)

716

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

717

526

self.current_checker_command = command

718

527

try:

719

528

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

722

531

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

723

532

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

724

533

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

534

self.checker = subprocess.Popen(command,

734

535

close_fds=True,

735

shell=True, cwd="/",

736

**popen_args)

737

except OSError as error:

738

logger.error("Failed to start subprocess",

739

exc_info=error)

740

return True

741

self.checker_callback_tag = (gobject.child_watch_add

742

(self.checker.pid,

743

self.checker_callback,

744

data=command))

745

# The checker may have completed before the gobject

746

# watch was added. Check for this.

747

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.

748

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)

749

547

except OSError as error:

750

if error.errno == errno.ECHILD:

751

# This should never happen

752

logger.error("Child process vanished",

753

exc_info=error)

754

return True

755

raise

756

if pid:

757

gobject.source_remove(self.checker_callback_tag)

758

self.checker_callback(pid, status, command)

548

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

549

error)

759

550

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

760

551

return True

761

552

768

559

return

769

560

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

770

561

try:

771

self.checker.terminate()

562

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

772

563

#time.sleep(0.5)

773

564

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

774

# self.checker.kill()

565

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

775

566

except OSError as error:

776

567

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

777

568

raise

794

585

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

795

586

if byte_arrays and signature != "ay":

796

587

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

797

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

588

" signature %r" % signature)

798

589

def decorator(func):

799

590

func._dbus_is_property = True

800

591

func._dbus_interface = dbus_interface

808

599

return decorator

809

600

810

601

811

def dbus_interface_annotations(dbus_interface):

812

"""Decorator for marking functions returning interface annotations

813

814

Usage:

815

816

@dbus_interface_annotations("org.example.Interface")

817

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

818

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

819

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

820

"false"}

821

"""

822

def decorator(func):

823

func._dbus_is_interface = True

824

func._dbus_interface = dbus_interface

825

func._dbus_name = dbus_interface

826

return func

827

return decorator

828

829

830

def dbus_annotations(annotations):

831

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

832

Usage:

833

834

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

835

access="r")

836

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

837

"org.freedesktop.DBus.Property."

838

"EmitsChangedSignal": "false"})

839

def Property_dbus_property(self):

840

return dbus.Boolean(False)

841

"""

842

def decorator(func):

843

func._dbus_annotations = annotations

844

return func

845

return decorator

846

847

848

602

class DBusPropertyException(dbus.exceptions.DBusException):

849

603

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

850

604

"""

873

627

"""

874

628

875

629

@staticmethod

876

def _is_dbus_thing(thing):

877

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

878

879

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

880

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

881

"""

882

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

883

False)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

884

632

885

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

886

634

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

887

635

"""

888

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

889

name),

890

athing.__get__(self))

636

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

891

637

for cls in self.__class__.__mro__

892

for name, athing in

893

inspect.getmembers(cls,

894

self._is_dbus_thing(thing)))

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

895

640

896

641

def _get_dbus_property(self, interface_name, property_name):

897

642

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

899

644

"""

900

645

for cls in self.__class__.__mro__:

901

646

for name, value in (inspect.getmembers

902

(cls,

903

self._is_dbus_thing("property"))):

647

(cls, self._is_dbus_property)):

904

648

if (value._dbus_name == property_name

905

649

and value._dbus_interface == interface_name):

906

650

return value.__get__(self)

935

679

# signatures other than "ay".

936

680

if prop._dbus_signature != "ay":

937

681

raise ValueError

938

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

939

for byte in value))

682

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

683

for byte in value))

940

684

prop(value)

941

685

942

686

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

947

691

948

692

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

949

693

"""

950

properties = {}

951

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

952

696

if (interface_name

953

697

and interface_name != prop._dbus_interface):

954

698

# Interface non-empty but did not match

958

702

continue

959

703

value = prop()

960

704

if not hasattr(value, "variant_level"):

961

properties[name] = value

705

all[name] = value

962

706

continue

963

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

964

value.variant_level+1)

965

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")

966

710

967

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

968

712

out_signature="s",

969

713

path_keyword='object_path',

970

714

connection_keyword='connection')

971

715

def Introspect(self, object_path, connection):

972

"""Overloading of standard D-Bus method.

973

974

Inserts property tags and interface annotation tags.

716

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

975

717

"""

976

718

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

977

719

connection)

984

726

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

985

727

return e

986

728

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

987

# Add property tags

988

729

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

989

730

for name, prop

990

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

991

732

if prop._dbus_interface

992

733

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

993

734

if_tag.appendChild(tag)

994

# Add annotation tags

995

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

996

for tag in if_tag.getElementsByTagName(typ):

997

annots = dict()

998

for name, prop in (self.

999

_get_all_dbus_things(typ)):

1000

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

1001

and prop._dbus_interface

1002

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

1003

annots.update(getattr

1004

(prop,

1005

"_dbus_annotations",

1006

{}))

1007

for name, value in annots.iteritems():

1008

ann_tag = document.createElement(

1009

"annotation")

1010

ann_tag.setAttribute("name", name)

1011

ann_tag.setAttribute("value", value)

1012

tag.appendChild(ann_tag)

1013

# Add interface annotation tags

1014

for annotation, value in dict(

1015

itertools.chain.from_iterable(

1016

annotations().iteritems()

1017

for name, annotations in

1018

self._get_all_dbus_things("interface")

1019

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

1020

)).iteritems():

1021

ann_tag = document.createElement("annotation")

1022

ann_tag.setAttribute("name", annotation)

1023

ann_tag.setAttribute("value", value)

1024

if_tag.appendChild(ann_tag)

1025

735

# Add the names to the return values for the

1026

736

# "org.freedesktop.DBus.Properties" methods

1027

737

if (if_tag.getAttribute("name")

1042

752

except (AttributeError, xml.dom.DOMException,

1043

753

xml.parsers.expat.ExpatError) as error:

1044

754

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

1045

exc_info=error)

755

error)

1046

756

return xmlstring

1047

757

1048

758

1049

def datetime_to_dbus(dt, variant_level=0):

759

def datetime_to_dbus (dt, variant_level=0):

1050

760

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

1051

761

if dt is None:

1052

762

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

1053

763

return dbus.String(dt.isoformat(),

1054

764

variant_level=variant_level)

1055

765

1056

1057

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1058

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

1059

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

1060

interface names according to the "alt_interface_names" mapping.

1061

Usage:

1062

1063

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

1064

"net.example.AlternateInterface"})

1065

class SampleDBusObject(dbus.service.Object):

1066

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

1067

def SampleDBusMethod():

1068

pass

1069

1070

The above "SampleDBusMethod" on "SampleDBusObject" will be

1071

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

1072

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

1073

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

1074

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

1075

1076

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

1077

(from DBusObjectWithProperties) and interfaces (from the

1078

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.

1079

770

"""

1080

def wrapper(cls):

1081

for orig_interface_name, alt_interface_name in (

1082

alt_interface_names.iteritems()):

1083

attr = {}

1084

interface_names = set()

1085

# Go though all attributes of the class

1086

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):

1087

778

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

1088

779

# with the wrong interface name

1089

780

if (not hasattr(attribute, "_dbus_interface")

1090

781

or not attribute._dbus_interface

1091

.startswith(orig_interface_name)):

782

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

1092

783

continue

1093

784

# Create an alternate D-Bus interface name based on

1094

785

# the current name

1095

786

alt_interface = (attribute._dbus_interface

1096

.replace(orig_interface_name,

1097

alt_interface_name))

1098

interface_names.add(alt_interface)

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1099

789

# Is this a D-Bus signal?

1100

790

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

1101

# Extract the original non-method undecorated

1102

# function by black magic

791

# Extract the original non-method function by

792

# black magic

1103

793

nonmethod_func = (dict(

1104

794

zip(attribute.func_code.co_freevars,

1105

795

attribute.__closure__))["func"]

1116

806

nonmethod_func.func_name,

1117

807

nonmethod_func.func_defaults,

1118

808

nonmethod_func.func_closure)))

1119

# Copy annotations, if any

1120

try:

1121

new_function._dbus_annotations = (

1122

dict(attribute._dbus_annotations))

1123

except AttributeError:

1124

pass

1125

809

# Define a creator of a function to call both the

1126

# original and alternate functions, so both the

1127

# original and alternate signals gets sent when

1128

# the function is called

810

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

811

# signals gets sent when the function is called

1129

812

def fixscope(func1, func2):

1130

813

"""This function is a scope container to pass

1131

814

func1 and func2 to the "call_both" function

1138

821

return call_both

1139

822

# Create the "call_both" function and add it to

1140

823

# the class

1141

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1142

826

# Is this a D-Bus method?

1143

827

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

1144

828

# Create a new, but exactly alike, function

1155

839

attribute.func_name,

1156

840

attribute.func_defaults,

1157

841

attribute.func_closure)))

1158

# Copy annotations, if any

1159

try:

1160

attr[attrname]._dbus_annotations = (

1161

dict(attribute._dbus_annotations))

1162

except AttributeError:

1163

pass

1164

842

# Is this a D-Bus property?

1165

843

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

1166

844

# Create a new, but exactly alike, function

1180

858

attribute.func_name,

1181

859

attribute.func_defaults,

1182

860

attribute.func_closure)))

1183

# Copy annotations, if any

1184

try:

1185

attr[attrname]._dbus_annotations = (

1186

dict(attribute._dbus_annotations))

1187

except AttributeError:

1188

pass

1189

# Is this a D-Bus interface?

1190

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

1191

# Create a new, but exactly alike, function

1192

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

1193

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

1194

# to the class.

1195

attr[attrname] = (dbus_interface_annotations

1196

(alt_interface)

1197

(types.FunctionType

1198

(attribute.func_code,

1199

attribute.func_globals,

1200

attribute.func_name,

1201

attribute.func_defaults,

1202

attribute.func_closure)))

1203

if deprecate:

1204

# Deprecate all alternate interfaces

1205

iname="_AlternateDBusNames_interface_annotation{0}"

1206

for interface_name in interface_names:

1207

@dbus_interface_annotations(interface_name)

1208

def func(self):

1209

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

1210

"true" }

1211

# Find an unused name

1212

for aname in (iname.format(i)

1213

for i in itertools.count()):

1214

if aname not in attr:

1215

attr[aname] = func

1216

break

1217

if interface_names:

1218

# Replace the class with a new subclass of it with

1219

# methods, signals, etc. as created above.

1220

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

1221

(cls,), attr)

1222

return cls

1223

return wrapper

1224

1225

1226

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

1227

"se.bsnet.fukt.Mandos"})

861

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

862

1228

863

class ClientDBus(Client, DBusObjectWithProperties):

1229

864

"""A Client class using D-Bus

1230

865

1239

874

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

1240

875

1241

876

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

877

self._approvals_pending = 0

1242

878

self.bus = bus

1243

879

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

1244

880

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

1250

886

("/clients/" + client_object_name))

1251

887

DBusObjectWithProperties.__init__(self, self.bus,

1252

888

self.dbus_object_path)

1253

889

1254

890

def notifychangeproperty(transform_func,

1255

891

dbus_name, type_func=lambda x: x,

1256

892

variant_level=1):

1257

893

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

1258

894

its changes to DBus.

1259

895

1260

896

transform_fun: Function that takes a value and a variant_level

1261

897

and transforms it to a D-Bus type.

1262

898

dbus_name: D-Bus name of the variable

1279

915

1280

916

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

1281

917

918

1282

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1283

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1284

921

"ApprovalPending",

1291

928

checker is not None)

1292

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1293

930

"LastCheckedOK")

1294

last_checker_status = notifychangeproperty(dbus.Int16,

1295

"LastCheckerStatus")

1296

931

last_approval_request = notifychangeproperty(

1297

932

datetime_to_dbus, "LastApprovalRequest")

1298

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1299

934

"ApprovedByDefault")

1300

approval_delay = notifychangeproperty(dbus.UInt64,

935

approval_delay = notifychangeproperty(dbus.UInt16,

1301

936

"ApprovalDelay",

1302

937

type_func =

1303

timedelta_to_milliseconds)

938

_timedelta_to_milliseconds)

1304

939

approval_duration = notifychangeproperty(

1305

dbus.UInt64, "ApprovalDuration",

1306

type_func = timedelta_to_milliseconds)

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1307

942

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

1308

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

943

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

1309

944

type_func =

1310

timedelta_to_milliseconds)

945

_timedelta_to_milliseconds)

1311

946

extended_timeout = notifychangeproperty(

1312

dbus.UInt64, "ExtendedTimeout",

1313

type_func = timedelta_to_milliseconds)

1314

interval = notifychangeproperty(dbus.UInt64,

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1315

950

"Interval",

1316

951

type_func =

1317

timedelta_to_milliseconds)

952

_timedelta_to_milliseconds)

1318

953

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

1319

954

1320

955

del notifychangeproperty

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:

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()