/mandos/release : revision 237.7.195

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

66

import hashlib

68

import binascii

69

import tempfile

70

import itertools

71

import collections

67

72

68

73

import dbus

69

74

import dbus.service

74

79

import ctypes.util

75

80

import xml.dom.minidom

76

81

import inspect

77

import Crypto.Cipher.AES

78

82

79

83

try:

80

84

SO_BINDTODEVICE = socket.SO_BINDTODEVICE

84

88

except ImportError:

85

89

SO_BINDTODEVICE = None

86

90

87

88

version = "1.4.1"

91

version = "1.6.2"

92

stored_state_file = "clients.pickle"

89

93

90

94

logger = logging.getLogger()

91

stored_state_path = "/var/lib/mandos/clients.pickle"

92

93

95

syslogger = (logging.handlers.SysLogHandler

94

96

(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

95

97

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

96

syslogger.setFormatter(logging.Formatter

97

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

98

' %(message)s'))

99

logger.addHandler(syslogger)

100

101

console = logging.StreamHandler()

102

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

103

' [%(process)d]:'

104

' %(levelname)s:'

105

' %(message)s'))

106

logger.addHandler(console)

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

107

219

108

220

109

221

class AvahiError(Exception):

128

240

Used to optionally bind to the specified interface.

129

241

name: string; Example: 'Mandos'

130

242

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

131

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

243

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

132

244

port: integer; what port to announce

133

245

TXT: list of strings; TXT record for the service

134

246

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

140

252

server: D-Bus Server

141

253

bus: dbus.SystemBus()

142

254

"""

255

143

256

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

144

257

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

145

258

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

158

271

self.server = None

159

272

self.bus = bus

160

273

self.entry_group_state_changed_match = None

274

161

275

def rename(self):

162

276

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

163

277

if self.rename_count >= self.max_renames:

173

287

try:

174

288

self.add()

175

289

except dbus.exceptions.DBusException as error:

176

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

290

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

177

291

self.cleanup()

178

292

os._exit(1)

179

293

self.rename_count += 1

294

180

295

def remove(self):

181

296

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

182

297

if self.entry_group_state_changed_match is not None:

184

299

self.entry_group_state_changed_match = None

185

300

if self.group is not None:

186

301

self.group.Reset()

302

187

303

def add(self):

188

304

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

189

305

self.remove()

206

322

dbus.UInt16(self.port),

207

323

avahi.string_array_to_txt_array(self.TXT))

208

324

self.group.Commit()

325

209

326

def entry_group_state_changed(self, state, error):

210

327

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

211

328

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

218

335

elif state == avahi.ENTRY_GROUP_FAILURE:

219

336

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

220

337

unicode(error))

221

raise AvahiGroupError("State changed: %s"

222

% unicode(error))

338

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

339

.format(error))

340

223

341

def cleanup(self):

224

342

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

225

343

if self.group is not None:

226

344

try:

227

345

self.group.Free()

228

346

except (dbus.exceptions.UnknownMethodException,

229

dbus.exceptions.DBusException) as e:

347

dbus.exceptions.DBusException):

230

348

pass

231

349

self.group = None

232

350

self.remove()

351

233

352

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

234

353

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

235

354

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

254

373

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

255

374

else:

256

375

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

376

257

377

def activate(self):

258

378

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

259

379

if self.server is None:

266

386

self.server_state_changed)

267

387

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

268

388

389

269

390

class AvahiServiceToSyslog(AvahiService):

270

391

def rename(self):

271

392

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

272

393

ret = AvahiService.rename(self)

273

394

syslogger.setFormatter(logging.Formatter

274

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

275

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

276

% self.name))

395

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

396

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

397

.format(self.name)))

277

398

return ret

278

399

279

def _timedelta_to_milliseconds(td):

400

401

def timedelta_to_milliseconds(td):

280

402

"Convert a datetime.timedelta() to milliseconds"

281

403

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

282

404

+ (td.seconds * 1000)

283

405

+ (td.microseconds // 1000))

284

406

407

285

408

class Client(object):

286

409

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

287

410

288

411

Attributes:

289

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

412

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

290

413

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

291

414

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

292

415

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

311

434

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

312

435

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

313

436

last_checker_status: integer between 0 and 255 reflecting exit

314

status of last checker. -1 reflect crashed

315

checker, or None.

316

last_enabled: datetime.datetime(); (UTC)

437

status of last checker. -1 reflects crashed

438

checker, -2 means no checker completed yet.

439

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

317

440

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

318

441

D-Bus identifiers

319

442

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

320

443

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

321

444

until this client is disabled

322

extended_timeout: extra long timeout when password has been sent

445

extended_timeout: extra long timeout when secret has been sent

323

446

runtime_expansions: Allowed attributes for runtime expansion.

324

447

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

325

448

disabled, or None

449

server_settings: The server_settings dict from main()

326

450

"""

327

451

328

452

runtime_expansions = ("approval_delay", "approval_duration",

329

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

330

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

453

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

454

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

455

"last_approval_request", "last_checked_ok",

331

456

"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

}

332

467

333

468

def timeout_milliseconds(self):

334

469

"Return the 'timeout' attribute in milliseconds"

335

return _timedelta_to_milliseconds(self.timeout)

470

return timedelta_to_milliseconds(self.timeout)

336

471

337

472

def extended_timeout_milliseconds(self):

338

473

"Return the 'extended_timeout' attribute in milliseconds"

339

return _timedelta_to_milliseconds(self.extended_timeout)

474

return timedelta_to_milliseconds(self.extended_timeout)

340

475

341

476

def interval_milliseconds(self):

342

477

"Return the 'interval' attribute in milliseconds"

343

return _timedelta_to_milliseconds(self.interval)

478

return timedelta_to_milliseconds(self.interval)

344

479

345

480

def approval_delay_milliseconds(self):

346

return _timedelta_to_milliseconds(self.approval_delay)

347

348

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

349

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

350

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

351

attribute."""

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):

352

531

self.name = name

353

if config is None:

354

config = {}

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

355

549

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

356

550

# Uppercase and remove spaces from fingerprint for later

357

551

# comparison purposes with return value from the fingerprint()

358

552

# function

359

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

360

.replace(" ", ""))

361

553

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

362

if "secret" in config:

363

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

364

elif "secfile" in config:

365

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

366

(config["secfile"])),

367

"rb") as secfile:

368

self.secret = secfile.read()

369

else:

370

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

371

% self.name)

372

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

373

self.created = datetime.datetime.utcnow()

374

self.enabled = True

375

self.last_approval_request = None

376

self.last_enabled = datetime.datetime.utcnow()

377

self.last_checked_ok = None

378

self.last_checker_status = None

379

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

380

self.extended_timeout = string_to_delta(config

381

["extended_timeout"])

382

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

554

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

555

datetime.datetime.utcnow())

556

557

# attributes specific for this server instance

383

558

self.checker = None

384

559

self.checker_initiator_tag = None

385

560

self.disable_initiator_tag = None

386

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

387

561

self.checker_callback_tag = None

388

self.checker_command = config["checker"]

389

562

self.current_checker_command = None

390

self._approved = None

391

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

392

True)

563

self.approved = None

393

564

self.approvals_pending = 0

394

self.approval_delay = string_to_delta(

395

config["approval_delay"])

396

self.approval_duration = string_to_delta(

397

config["approval_duration"])

398

565

self.changedstate = (multiprocessing_manager

399

566

.Condition(multiprocessing_manager

400

567

.Lock()))

401

self.client_structure = [attr for attr

402

in self.__dict__.iterkeys()

568

self.client_structure = [attr for attr in

569

self.__dict__.iterkeys()

403

570

if not attr.startswith("_")]

404

571

self.client_structure.append("client_structure")

405

406

572

407

573

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

408

574

lambda obj:

409

575

isinstance(obj,

421

587

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

422

588

# Already enabled

423

589

return

424

self.send_changedstate()

425

590

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

426

591

self.enabled = True

427

592

self.last_enabled = datetime.datetime.utcnow()

428

593

self.init_checker()

594

self.send_changedstate()

429

595

430

596

def disable(self, quiet=True):

431

597

"""Disable this client."""

432

598

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

433

599

return False

434

600

if not quiet:

435

self.send_changedstate()

436

if not quiet:

437

601

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

438

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

602

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

439

603

gobject.source_remove(self.disable_initiator_tag)

440

604

self.disable_initiator_tag = None

441

605

self.expires = None

442

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

606

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

443

607

gobject.source_remove(self.checker_initiator_tag)

444

608

self.checker_initiator_tag = None

445

609

self.stop_checker()

446

610

self.enabled = False

611

if not quiet:

612

self.send_changedstate()

447

613

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

448

614

return False

449

615

450

616

def __del__(self):

451

617

self.disable()

452

618

453

619

def init_checker(self):

454

620

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

455

621

# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

456

624

self.checker_initiator_tag = (gobject.timeout_add

457

625

(self.interval_milliseconds(),

458

626

self.start_checker))

459

627

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

460

630

self.disable_initiator_tag = (gobject.timeout_add

461

631

(self.timeout_milliseconds(),

462

632

self.disable))

463

633

# Also start a new checker *right now*.

464

634

self.start_checker()

465

466

635

467

636

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

468

637

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

469

638

self.checker_callback_tag = None

470

639

self.checker = None

471

640

if os.WIFEXITED(condition):

472

self.last_checker_status = os.WEXITSTATUS(condition)

641

self.last_checker_status = os.WEXITSTATUS(condition)

473

642

if self.last_checker_status == 0:

474

643

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

475

644

vars(self))

482

651

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

483

652

vars(self))

484

653

485

def checked_ok(self, timeout=None):

486

"""Bump up the timeout for this client.

487

488

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

489

alive and well.

490

"""

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."""

491

662

if timeout is None:

492

663

timeout = self.timeout

493

self.last_checked_ok = datetime.datetime.utcnow()

494

664

if self.disable_initiator_tag is not None:

495

665

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

496

667

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

497

668

self.disable_initiator_tag = (gobject.timeout_add

498

(_timedelta_to_milliseconds

669

(timedelta_to_milliseconds

499

670

(timeout), self.disable))

500

671

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

501

672

508

679

If a checker already exists, leave it running and do

509

680

nothing."""

510

681

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

511

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

512

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

513

# client would inevitably timeout, since no checker would get

514

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

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

515

686

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

516

687

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

517

688

# should be.

519

690

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

520

691

try:

521

692

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

522

except (AttributeError, OSError) as error:

523

if (isinstance(error, OSError)

524

and error.errno != errno.ECHILD):

525

raise error

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

526

698

else:

527

699

if pid:

528

700

logger.warning("Checker was a zombie")

531

703

self.current_checker_command)

532

704

# Start a new checker if needed

533

705

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)

534

711

try:

535

# In case checker_command has exactly one % operator

536

command = self.checker_command % self.host

537

except TypeError:

538

# Escape attributes for the shell

539

escaped_attrs = dict(

540

(attr,

541

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

542

errors=

543

'replace')))

544

for attr in

545

self.runtime_expansions)

546

547

try:

548

command = self.checker_command % escaped_attrs

549

except TypeError as error:

550

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

551

' %s', self.checker_command, error)

552

return True # Try again later

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

553

717

self.current_checker_command = command

554

718

try:

555

719

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

558

722

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

559

723

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

560

724

# 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 })

561

733

self.checker = subprocess.Popen(command,

562

734

close_fds=True,

563

shell=True, cwd="/")

564

self.checker_callback_tag = (gobject.child_watch_add

565

(self.checker.pid,

566

self.checker_callback,

567

data=command))

568

# The checker may have completed before the gobject

569

# watch was added. Check for this.

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:

570

748

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

571

if pid:

572

gobject.source_remove(self.checker_callback_tag)

573

self.checker_callback(pid, status, command)

574

749

except OSError as error:

575

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

576

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)

577

759

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

578

760

return True

579

761

586

768

return

587

769

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

588

770

try:

589

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

771

self.checker.terminate()

590

772

#time.sleep(0.5)

591

773

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

592

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

774

# self.checker.kill()

593

775

except OSError as error:

594

776

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

595

777

raise

596

778

self.checker = None

597

779

598

# Encrypts a client secret and stores it in a varible

599

# encrypted_secret

600

def encrypt_secret(self, key):

601

# Encryption-key need to be of a specific size, so we hash

602

# supplied key

603

hasheng = hashlib.sha256()

604

hasheng.update(key)

605

encryptionkey = hasheng.digest()

606

607

# Create validation hash so we know at decryption if it was

608

# sucessful

609

hasheng = hashlib.sha256()

610

hasheng.update(self.secret)

611

validationhash = hasheng.digest()

612

613

# Encrypt secret

614

iv = os.urandom(Crypto.Cipher.AES.block_size)

615

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

616

Crypto.Cipher.AES.MODE_CFB, iv)

617

ciphertext = ciphereng.encrypt(validationhash+self.secret)

618

self.encrypted_secret = (ciphertext, iv)

619

620

# Decrypt a encrypted client secret

621

def decrypt_secret(self, key):

622

# Decryption-key need to be of a specific size, so we hash

623

# supplied key

624

hasheng = hashlib.sha256()

625

hasheng.update(key)

626

encryptionkey = hasheng.digest()

627

628

# Decrypt encrypted secret

629

ciphertext, iv = self.encrypted_secret

630

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

631

Crypto.Cipher.AES.MODE_CFB, iv)

632

plain = ciphereng.decrypt(ciphertext)

633

634

# Validate decrypted secret to know if it was succesful

635

hasheng = hashlib.sha256()

636

validationhash = plain[:hasheng.digest_size]

637

secret = plain[hasheng.digest_size:]

638

hasheng.update(secret)

639

640

# If validation fails, we use key as new secret. Otherwise, we

641

# use the decrypted secret

642

if hasheng.digest() == validationhash:

643

self.secret = secret

644

else:

645

self.secret = key

646

del self.encrypted_secret

647

648

780

649

781

def dbus_service_property(dbus_interface, signature="v",

650

782

access="readwrite", byte_arrays=False):

662

794

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

663

795

if byte_arrays and signature != "ay":

664

796

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

665

" signature %r" % signature)

797

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

666

798

def decorator(func):

667

799

func._dbus_is_property = True

668

800

func._dbus_interface = dbus_interface

676

808

return decorator

677

809

678

810

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

679

848

class DBusPropertyException(dbus.exceptions.DBusException):

680

849

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

681

850

"""

704

873

"""

705

874

706

875

@staticmethod

707

def _is_dbus_property(obj):

708

return getattr(obj, "_dbus_is_property", False)

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)

709

884

710

def _get_all_dbus_properties(self):

885

def _get_all_dbus_things(self, thing):

711

886

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

712

887

"""

713

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

888

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

889

name),

890

athing.__get__(self))

714

891

for cls in self.__class__.__mro__

715

for name, prop in

716

inspect.getmembers(cls, self._is_dbus_property))

892

for name, athing in

893

inspect.getmembers(cls,

894

self._is_dbus_thing(thing)))

717

895

718

896

def _get_dbus_property(self, interface_name, property_name):

719

897

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

721

899

"""

722

900

for cls in self.__class__.__mro__:

723

901

for name, value in (inspect.getmembers

724

(cls, self._is_dbus_property)):

902

(cls,

903

self._is_dbus_thing("property"))):

725

904

if (value._dbus_name == property_name

726

905

and value._dbus_interface == interface_name):

727

906

return value.__get__(self)

756

935

# signatures other than "ay".

757

936

if prop._dbus_signature != "ay":

758

937

raise ValueError

759

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

760

for byte in value))

938

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

939

for byte in value))

761

940

prop(value)

762

941

763

942

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

768

947

769

948

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

770

949

"""

771

all = {}

772

for name, prop in self._get_all_dbus_properties():

950

properties = {}

951

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

773

952

if (interface_name

774

953

and interface_name != prop._dbus_interface):

775

954

# Interface non-empty but did not match

779

958

continue

780

959

value = prop()

781

960

if not hasattr(value, "variant_level"):

782

all[name] = value

961

properties[name] = value

783

962

continue

784

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

785

value.variant_level+1)

786

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

963

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

964

value.variant_level+1)

965

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

787

966

788

967

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

789

968

out_signature="s",

790

969

path_keyword='object_path',

791

970

connection_keyword='connection')

792

971

def Introspect(self, object_path, connection):

793

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

972

"""Overloading of standard D-Bus method.

973

974

Inserts property tags and interface annotation tags.

794

975

"""

795

976

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

796

977

connection)

803

984

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

804

985

return e

805

986

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

987

# Add property tags

806

988

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

807

989

for name, prop

808

in self._get_all_dbus_properties()

990

in self._get_all_dbus_things("property")

809

991

if prop._dbus_interface

810

992

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

811

993

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)

812

1025

# Add the names to the return values for the

813

1026

# "org.freedesktop.DBus.Properties" methods

814

1027

if (if_tag.getAttribute("name")

829

1042

except (AttributeError, xml.dom.DOMException,

830

1043

xml.parsers.expat.ExpatError) as error:

831

1044

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

832

error)

1045

exc_info=error)

833

1046

return xmlstring

834

1047

835

1048

836

def datetime_to_dbus (dt, variant_level=0):

1049

def datetime_to_dbus(dt, variant_level=0):

837

1050

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

838

1051

if dt is None:

839

1052

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

840

1053

return dbus.String(dt.isoformat(),

841

1054

variant_level=variant_level)

842

1055

843

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

844

.__metaclass__):

845

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

846

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

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).

847

1079

"""

848

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

849

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

850

# methods, signals, or properties in them

851

for base in (b for b in bases

852

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

853

# Go though all attributes of the base class

854

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

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):

855

1087

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

856

1088

# with the wrong interface name

857

1089

if (not hasattr(attribute, "_dbus_interface")

858

1090

or not attribute._dbus_interface

859

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

1091

.startswith(orig_interface_name)):

860

1092

continue

861

1093

# Create an alternate D-Bus interface name based on

862

1094

# the current name

863

1095

alt_interface = (attribute._dbus_interface

864

.replace("se.recompile.Mandos",

865

"se.bsnet.fukt.Mandos"))

1096

.replace(orig_interface_name,

1097

alt_interface_name))

1098

interface_names.add(alt_interface)

866

1099

# Is this a D-Bus signal?

867

1100

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

868

# Extract the original non-method function by

869

# black magic

1101

# Extract the original non-method undecorated

1102

# function by black magic

870

1103

nonmethod_func = (dict(

871

1104

zip(attribute.func_code.co_freevars,

872

1105

attribute.__closure__))["func"]

883

1116

nonmethod_func.func_name,

884

1117

nonmethod_func.func_defaults,

885

1118

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

886

1125

# Define a creator of a function to call both the

887

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

888

# signals gets sent when the function is called

1126

# original and alternate functions, so both the

1127

# original and alternate signals gets sent when

1128

# the function is called

889

1129

def fixscope(func1, func2):

890

1130

"""This function is a scope container to pass

891

1131

func1 and func2 to the "call_both" function

898

1138

return call_both

899

1139

# Create the "call_both" function and add it to

900

1140

# the class

901

attr[attrname] = fixscope(attribute,

902

new_function)

1141

attr[attrname] = fixscope(attribute, new_function)

903

1142

# Is this a D-Bus method?

904

1143

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

905

1144

# Create a new, but exactly alike, function

916

1155

attribute.func_name,

917

1156

attribute.func_defaults,

918

1157

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

919

1164

# Is this a D-Bus property?

920

1165

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

921

1166

# Create a new, but exactly alike, function

935

1180

attribute.func_name,

936

1181

attribute.func_defaults,

937

1182

attribute.func_closure)))

938

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

939

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"})

940

1228

class ClientDBus(Client, DBusObjectWithProperties):

941

1229

"""A Client class using D-Bus

942

1230

952

1240

953

1241

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

954

1242

self.bus = bus

955

self._approvals_pending = 0

956

1243

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

957

self.add_to_dbus()

958

959

def add_to_dbus(self):

960

1244

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

961

1245

# the D-Bus

962

1246

client_object_name = unicode(self.name).translate(

966

1250

("/clients/" + client_object_name))

967

1251

DBusObjectWithProperties.__init__(self, self.bus,

968

1252

self.dbus_object_path)

969

1253

970

1254

def notifychangeproperty(transform_func,

971

1255

dbus_name, type_func=lambda x: x,

972

1256

variant_level=1):

973

1257

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

974

1258

its changes to DBus.

975

1259

976

1260

transform_fun: Function that takes a value and a variant_level

977

1261

and transforms it to a D-Bus type.

978

1262

dbus_name: D-Bus name of the variable

995

1279

996

1280

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

997

1281

998

999

1282

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1000

1283

approvals_pending = notifychangeproperty(dbus.Boolean,

1001

1284

"ApprovalPending",

1008

1291

checker is not None)

1009

1292

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1010

1293

"LastCheckedOK")

1294

last_checker_status = notifychangeproperty(dbus.Int16,

1295

"LastCheckerStatus")

1011

1296

last_approval_request = notifychangeproperty(

1012

1297

datetime_to_dbus, "LastApprovalRequest")

1013

1298

approved_by_default = notifychangeproperty(dbus.Boolean,

1014

1299

"ApprovedByDefault")

1015

approval_delay = notifychangeproperty(dbus.UInt16,

1300

approval_delay = notifychangeproperty(dbus.UInt64,

1016

1301

"ApprovalDelay",

1017

1302

type_func =

1018

_timedelta_to_milliseconds)

1303

timedelta_to_milliseconds)

1019

1304

approval_duration = notifychangeproperty(

1020

dbus.UInt16, "ApprovalDuration",

1021

type_func = _timedelta_to_milliseconds)

1305

dbus.UInt64, "ApprovalDuration",

1306

type_func = timedelta_to_milliseconds)

1022

1307

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

1023

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

1308

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

1024

1309

type_func =

1025

_timedelta_to_milliseconds)

1310

timedelta_to_milliseconds)

1026

1311

extended_timeout = notifychangeproperty(

1027

dbus.UInt16, "ExtendedTimeout",

1028

type_func = _timedelta_to_milliseconds)

1029

interval = notifychangeproperty(dbus.UInt16,

1312

dbus.UInt64, "ExtendedTimeout",

1313

type_func = timedelta_to_milliseconds)

1314

interval = notifychangeproperty(dbus.UInt64,

1030

1315

"Interval",

1031

1316

type_func =

1032

_timedelta_to_milliseconds)

1317

timedelta_to_milliseconds)

1033

1318

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

1034

1319

1035

1320

del notifychangeproperty

1077

1362

return r

1078

1363

1079

1364

def _reset_approved(self):

1080

self._approved = None

1365

self.approved = None

1081

1366

return False

1082

1367

1083

1368

def approve(self, value=True):

1084

self.send_changedstate()

1085

self._approved = value

1086

gobject.timeout_add(_timedelta_to_milliseconds

1369

self.approved = value

1370

gobject.timeout_add(timedelta_to_milliseconds

1087

1371

(self.approval_duration),

1088

1372

self._reset_approved)

1089

1373

self.send_changedstate()

1090

1374

1091

1375

## D-Bus methods, signals & properties

1092

1376

_interface = "se.recompile.Mandos.Client"

1093

1377

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1094

1385

## Signals

1095

1386

1096

1387

# CheckerCompleted - signal

1195

1486

access="readwrite")

1196

1487

def ApprovalDuration_dbus_property(self, value=None):

1197

1488

if value is None: # get

1198

return dbus.UInt64(_timedelta_to_milliseconds(

1489

return dbus.UInt64(timedelta_to_milliseconds(

1199

1490

self.approval_duration))

1200

1491

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

1201

1492

1215

1506

def Host_dbus_property(self, value=None):

1216

1507

if value is None: # get

1217

1508

return dbus.String(self.host)

1218

self.host = value

1509

self.host = unicode(value)

1219

1510

1220

1511

# Created - property

1221

1512

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

1222

1513

def Created_dbus_property(self):

1223

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

1514

return datetime_to_dbus(self.created)

1224

1515

1225

1516

# LastEnabled - property

1226

1517

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

1247

1538

return

1248

1539

return datetime_to_dbus(self.last_checked_ok)

1249

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

1250

1547

# Expires - property

1251

1548

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

1252

1549

def Expires_dbus_property(self):

1263

1560

def Timeout_dbus_property(self, value=None):

1264

1561

if value is None: # get

1265

1562

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1266

1564

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

1267

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

1268

return

1269

# Reschedule timeout

1270

gobject.source_remove(self.disable_initiator_tag)

1271

self.disable_initiator_tag = None

1272

self.expires = None

1273

time_to_die = _timedelta_to_milliseconds((self

1274

.last_checked_ok

1275

+ self.timeout)

1276

- datetime.datetime

1277

.utcnow())

1278

if time_to_die <= 0:

1279

# The timeout has passed

1280

self.disable()

1281

else:

1282

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

1283

+ datetime.timedelta(milliseconds =

1284

time_to_die))

1285

self.disable_initiator_tag = (gobject.timeout_add

1286

(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))

1287

1581

1288

1582

# ExtendedTimeout - property

1289

1583

@dbus_service_property(_interface, signature="t",

1302

1596

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

1303

1597

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

1304

1598

return

1305

# Reschedule checker run

1306

gobject.source_remove(self.checker_initiator_tag)

1307

self.checker_initiator_tag = (gobject.timeout_add

1308

(value, self.start_checker))

1309

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

1310

1605

1311

1606

# Checker - property

1312

1607

@dbus_service_property(_interface, signature="s",

1314

1609

def Checker_dbus_property(self, value=None):

1315

1610

if value is None: # get

1316

1611

return dbus.String(self.checker_command)

1317

self.checker_command = value

1612

self.checker_command = unicode(value)

1318

1613

1319

1614

# CheckerRunning - property

1320

1615

@dbus_service_property(_interface, signature="b",

1349

1644

raise KeyError()

1350

1645

1351

1646

def __getattribute__(self, name):

1352

if(name == '_pipe'):

1647

if name == '_pipe':

1353

1648

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

1354

1649

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

1355

1650

data = self._pipe.recv()

1362

1657

return func

1363

1658

1364

1659

def __setattr__(self, name, value):

1365

if(name == '_pipe'):

1660

if name == '_pipe':

1366

1661

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

1367

1662

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

1368

1663

1369

class ClientDBusTransitional(ClientDBus):

1370

__metaclass__ = AlternateDBusNamesMetaclass

1371

1664

1372

1665

class ClientHandler(socketserver.BaseRequestHandler, object):

1373

1666

"""A class to handle client connections.

1410

1703

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

1411

1704

try:

1412

1705

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

1413

raise RuntimeError

1706

raise RuntimeError(line)

1414

1707

except (ValueError, IndexError, RuntimeError) as error:

1415

1708

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

1416

1709

return

1456

1749

client.Rejected("Disabled")

1457

1750

return

1458

1751

1459

if client._approved or not client.approval_delay:

1752

if client.approved or not client.approval_delay:

1460

1753

#We are approved or approval is disabled

1461

1754

break

1462

elif client._approved is None:

1755

elif client.approved is None:

1463

1756

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

1464

1757

client.name)

1465

1758

if self.server.use_dbus:

1478

1771

#wait until timeout or approved

1479

1772

time = datetime.datetime.now()

1480

1773

client.changedstate.acquire()

1481

(client.changedstate.wait

1482

(float(client._timedelta_to_milliseconds(delay)

1483

/ 1000)))

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1484

1777

client.changedstate.release()

1485

1778

time2 = datetime.datetime.now()

1486

1779

if (time2 - time) >= delay:

1502

1795

try:

1503

1796

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

1504

1797

except gnutls.errors.GNUTLSError as error:

1505

logger.warning("gnutls send failed")

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1506

1800

return

1507

1801

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

1508

1802

sent, len(client.secret)

1511

1805

1512

1806

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

1513

1807

# bump the timeout using extended_timeout

1514

client.checked_ok(client.extended_timeout)

1808

client.bump_timeout(client.extended_timeout)

1515

1809

if self.server.use_dbus:

1516

1810

# Emit D-Bus signal

1517

1811

client.GotSecret()

1522

1816

try:

1523

1817

session.bye()

1524

1818

except gnutls.errors.GNUTLSError as error:

1525

logger.warning("GnuTLS bye failed")

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1526

1821

1527

1822

@staticmethod

1528

1823

def peer_certificate(session):

1584

1879

# Convert the buffer to a Python bytestring

1585

1880

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

1586

1881

# Convert the bytestring to hexadecimal notation

1587

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

1882

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

1588

1883

return hex_fpr

1589

1884

1590

1885

1593

1888

def sub_process_main(self, request, address):

1594

1889

try:

1595

1890

self.finish_request(request, address)

1596

except:

1891

except Exception:

1597

1892

self.handle_error(request, address)

1598

1893

self.close_request(request)

1599

1894

1600

1895

def process_request(self, request, address):

1601

1896

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

1602

1897

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

1603

args = (request,

1604

address))

1898

args = (request, address))

1605

1899

proc.start()

1606

1900

return proc

1607

1901

1622

1916

1623

1917

def add_pipe(self, parent_pipe, proc):

1624

1918

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

1625

raise NotImplementedError

1919

raise NotImplementedError()

1626

1920

1627

1921

1628

1922

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1635

1929

use_ipv6: Boolean; to use IPv6 or not

1636

1930

"""

1637

1931

def __init__(self, server_address, RequestHandlerClass,

1638

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

"""

1639

1936

self.interface = interface

1640

1937

if use_ipv6:

1641

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.

1642

1965

socketserver.TCPServer.__init__(self, server_address,

1643

1966

RequestHandlerClass)

1967

1644

1968

def server_bind(self):

1645

1969

"""This overrides the normal server_bind() function

1646

1970

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

1654

1978

try:

1655

1979

self.socket.setsockopt(socket.SOL_SOCKET,

1656

1980

SO_BINDTODEVICE,

1657

str(self.interface

1658

+ '\0'))

1981

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

1659

1982

except socket.error as error:

1660

if error[0] == errno.EPERM:

1661

logger.error("No permission to"

1662

" bind to interface %s",

1663

self.interface)

1664

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:

1665

1987

logger.error("SO_BINDTODEVICE not available;"

1666

1988

" cannot bind to interface %s",

1667

1989

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1668

1993

else:

1669

1994

raise

1670

1995

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

1673

1998

if self.address_family == socket.AF_INET6:

1674

1999

any_address = "::" # in6addr_any

1675

2000

else:

1676

any_address = socket.INADDR_ANY

2001

any_address = "0.0.0.0" # INADDR_ANY

1677

2002

self.server_address = (any_address,

1678

2003

self.server_address[1])

1679

2004

elif not self.server_address[1]:

1700

2025

"""

1701

2026

def __init__(self, server_address, RequestHandlerClass,

1702

2027

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

1703

gnutls_priority=None, use_dbus=True):

2028

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

1704

2029

self.enabled = False

1705

2030

self.clients = clients

1706

2031

if self.clients is None:

1710

2035

IPv6_TCPServer.__init__(self, server_address,

1711

2036

RequestHandlerClass,

1712

2037

interface = interface,

1713

use_ipv6 = use_ipv6)

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1714

2040

def server_activate(self):

1715

2041

if self.enabled:

1716

2042

return socketserver.TCPServer.server_activate(self)

1729

2055

1730

2056

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

1731

2057

proc = None, client_object=None):

1732

condition_names = {

1733

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

1734

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

1735

# blocking).

1736

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

1737

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

1738

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

1739

# broken, usually for pipes and

1740

# sockets).

1741

}

1742

conditions_string = ' | '.join(name

1743

for cond, name in

1744

condition_names.iteritems()

1745

if cond & condition)

1746

2058

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

1747

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

2059

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

1748

2060

# Wait for other process to exit

1749

2061

proc.join()

1750

2062

return False

1808

2120

return True

1809

2121

1810

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

1811

2222

def string_to_delta(interval):

1812

2223

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

1813

2224

1824

2235

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

1825

2236

datetime.timedelta(0, 330)

1826

2237

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

1827

2244

timevalue = datetime.timedelta(0)

1828

2245

for s in interval.split():

1829

2246

try:

1840

2257

elif suffix == "w":

1841

2258

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

1842

2259

else:

1843

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

1844

except (ValueError, IndexError) as e:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1845

2263

raise ValueError(*(e.args))

1846

2264

timevalue += delta

1847

2265

return timevalue

1848

2266

1849

2267

1850

def if_nametoindex(interface):

1851

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

1852

1853

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

1854

global if_nametoindex

1855

try:

1856

if_nametoindex = (ctypes.cdll.LoadLibrary

1857

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

1858

.if_nametoindex)

1859

except (OSError, AttributeError):

1860

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

1861

def if_nametoindex(interface):

1862

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

1863

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

1864

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

1865

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1866

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

1867

interface))

1868

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

1869

ifreq[16:20])[0]

1870

return interface_index

1871

return if_nametoindex(interface)

1872

1873

1874

2268

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

1875

2269

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

1876

2270

1884

2278

sys.exit()

1885

2279

if not noclose:

1886

2280

# Close all standard open file descriptors

1887

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

2281

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

1888

2282

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

1889

2283

raise OSError(errno.ENODEV,

1890

"%s not a character device"

1891

% os.path.devnull)

2284

"{0} not a character device"

2285

.format(os.devnull))

1892

2286

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

1893

2287

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

1894

2288

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

1903

2297

1904

2298

parser = argparse.ArgumentParser()

1905

2299

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

1906

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

2300

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

1907

2301

help="show version number and exit")

1908

2302

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

1909

2303

help="Bind to interface IF")

1915

2309

help="Run self-test")

1916

2310

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

1917

2311

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

1918

" to terminal")

2312

" to terminal", default=None)

1919

2313

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

1920

2314

help="Debug level for stdout output")

1921

2315

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

1928

2322

" files")

1929

2323

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

1930

2324

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

1931

" system bus interface")

2325

" system bus interface", default=None)

1932

2326

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

1933

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

2327

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

2328

default=None)

1934

2329

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

1935

dest="restore",

1936

help="Do not restore stored state",

1937

default=True)

1938

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

1939

2340

options = parser.parse_args()

1940

2341

1941

2342

if options.check:

1949

2350

"port": "",

1950

2351

"debug": "False",

1951

2352

"priority":

1952

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

2353

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

1953

2354

"servicename": "Mandos",

1954

2355

"use_dbus": "True",

1955

2356

"use_ipv6": "True",

1956

2357

"debuglevel": "",

2358

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

1957

2362

}

1958

2363

1959

2364

# Parse config file for server-global settings

1964

2369

# Convert the SafeConfigParser object to a dict

1965

2370

server_settings = server_config.defaults()

1966

2371

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

1967

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

2372

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

1968

2373

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

1969

2374

option)

1970

2375

if server_settings["port"]:

1971

2376

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

1972

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"])

1973

2387

del server_config

1974

2388

1975

2389

# Override the settings from the config file with command line

1976

2390

# options, if set.

1977

2391

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

1978

2392

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

1979

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

2393

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

2394

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

1980

2395

value = getattr(options, option)

1981

2396

if value is not None:

1982

2397

server_settings[option] = value

1985

2400

for option in server_settings.keys():

1986

2401

if type(server_settings[option]) is str:

1987

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

1988

2410

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

1989

2411

1990

2412

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

1994

2416

debuglevel = server_settings["debuglevel"]

1995

2417

use_dbus = server_settings["use_dbus"]

1996

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)

1997

2431

1998

2432

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

1999

2433

syslogger.setFormatter(logging.Formatter

2000

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

2001

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

2002

% server_settings["servicename"]))

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

2003

2438

2004

2439

# Parse config file with clients

2005

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

2006

"extended_timeout": "15m",

2007

"interval": "2m",

2008

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

2009

"host": "",

2010

"approval_delay": "0s",

2011

"approval_duration": "1s",

2012

}

2013

client_config = configparser.SafeConfigParser(client_defaults)

2440

client_config = configparser.SafeConfigParser(Client

2441

.client_defaults)

2014

2442

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

2015

2443

"clients.conf"))

2016

2444

2025

2453

use_ipv6=use_ipv6,

2026

2454

gnutls_priority=

2027

2455

server_settings["priority"],

2028

use_dbus=use_dbus)

2029

if not debug:

2030

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

2031

2464

try:

2032

2465

pidfile = open(pidfilename, "w")

2033

except IOError:

2034

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)

2035

2469

2036

try:

2037

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

2038

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

2039

except KeyError:

2470

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

2040

2471

try:

2041

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

2042

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

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

2043

2475

except KeyError:

2044

try:

2045

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

2046

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

2047

except KeyError:

2048

uid = 65534

2049

gid = 65534

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

2050

2480

try:

2051

2481

os.setgid(gid)

2052

2482

os.setuid(uid)

2053

2483

except OSError as error:

2054

if error[0] != errno.EPERM:

2055

raise error

2056

2057

if not debug and not debuglevel:

2058

logger.setLevel(logging.WARNING)

2059

if debuglevel:

2060

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

2061

logger.setLevel(level)

2484

if error.errno != errno.EPERM:

2485

raise

2062

2486

2063

2487

if debug:

2064

logger.setLevel(logging.DEBUG)

2065

2488

# Enable all possible GnuTLS debugging

2066

2489

2067

2490

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

2076

2499

.gnutls_global_set_log_function(debug_gnutls))

2077

2500

2078

2501

# Redirect stdin so all checkers get /dev/null

2079

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

2502

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

2080

2503

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

2081

2504

if null > 2:

2082

2505

os.close(null)

2083

else:

2084

# No console logging

2085

logger.removeHandler(console)

2086

2506

2087

2507

# Need to fork before connecting to D-Bus

2088

if not debug:

2508

if not foreground:

2089

2509

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

2090

2510

daemon()

2091

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

2092

2516

global main_loop

2093

2517

# From the Avahi example code

2094

DBusGMainLoop(set_as_default=True )

2518

DBusGMainLoop(set_as_default=True)

2095

2519

main_loop = gobject.MainLoop()

2096

2520

bus = dbus.SystemBus()

2097

2521

# End of Avahi example code

2103

2527

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

2104

2528

do_not_queue=True))

2105

2529

except dbus.exceptions.NameExistsException as e:

2106

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

2530

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

2107

2531

use_dbus = False

2108

2532

server_settings["use_dbus"] = False

2109

2533

tcp_server.use_dbus = False

2121

2545

2122

2546

client_class = Client

2123

2547

if use_dbus:

2124

client_class = functools.partial(ClientDBusTransitional,

2125

bus = bus)

2126

2127

special_settings = {

2128

# Some settings need to be accessd by special methods;

2129

# booleans need .getboolean(), etc. Here is a list of them:

2130

"approved_by_default":

2131

lambda section:

2132

client_config.getboolean(section, "approved_by_default"),

2133

}

2134

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

2135

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

2136

# with exceptions for any special settings as defined above

2137

client_settings = dict((clientname,

2138

dict((setting,

2139

(value if

2140

setting not in special_settings

2141

else special_settings[setting]

2142

(clientname)))

2143

for setting, value

2144

in client_config.items(clientname)))

2145

for clientname in client_config.sections())

2146

2548

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

2549

2550

client_settings = Client.config_parser(client_config)

2147

2551

old_client_settings = {}

2148

clients_data = []

2149

2150

# Get client data and settings from last running state.

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.

2151

2563

if server_settings["restore"]:

2152

2564

try:

2153

2565

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

2154

clients_data, old_client_settings = (

2155

pickle.load(stored_state))

2566

clients_data, old_client_settings = (pickle.load

2567

(stored_state))

2156

2568

os.remove(stored_state_path)

2157

2569

except IOError as e:

2158

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

2159

.format(e))

2160

if e.errno != errno.ENOENT:

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)

2161

2576

raise

2162

2163

for client in clients_data:

2164

client_name = client["name"]

2165

2166

# Decide which value to use after restoring saved state.

2167

# We have three different values: Old config file,

2168

# new config file, and saved state.

2169

# New config value takes precedence if it differs from old

2170

# config value, otherwise use saved state.

2171

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

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))

2172

2631

try:

2173

# For each value in new config, check if it differs

2174

# from the old config value (Except for the "secret"

2175

# attribute)

2176

if (name != "secret" and

2177

value != old_client_settings[client_name][name]):

2178

setattr(client, name, value)

2179

except KeyError:

2180

pass

2181

2182

# Clients who has passed its expire date, can still be enabled

2183

# if its last checker was sucessful. Clients who checkers

2184

# failed before we stored it state is asumed to had failed

2185

# checker during downtime.

2186

if client["enabled"] and client["last_checked_ok"]:

2187

if ((datetime.datetime.utcnow()

2188

- client["last_checked_ok"]) > client["interval"]):

2189

if client["last_checker_status"] != 0:

2190

client["enabled"] = False

2191

else:

2192

client["expires"] = (datetime.datetime.utcnow()

2193

+ client["timeout"])

2194

2195

client["changedstate"] = (multiprocessing_manager

2196

.Condition(multiprocessing_manager

2197

.Lock()))

2198

if use_dbus:

2199

new_client = ClientDBusTransitional.__new__(

2200

ClientDBusTransitional)

2201

tcp_server.clients[client_name] = new_client

2202

new_client.bus = bus

2203

for name, value in client.iteritems():

2204

setattr(new_client, name, value)

2205

new_client._approvals_pending = 0

2206

new_client.add_to_dbus()

2207

else:

2208

tcp_server.clients[client_name] = Client.__new__(Client)

2209

for name, value in client.iteritems():

2210

setattr(tcp_server.clients[client_name], name, value)

2211

2212

tcp_server.clients[client_name].decrypt_secret(

2213

client_settings[client_name]["secret"])

2214

2215

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

2216

for clientname in set(old_client_settings) - set(client_settings):

2217

del tcp_server.clients[clientname]

2218

for clientname in set(client_settings) - set(old_client_settings):

2219

tcp_server.clients[clientname] = client_class(name

2220

= clientname,

2221

config =

2222

client_settings

2223

[clientname])

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)

2224

2656

2225

2657

if not tcp_server.clients:

2226

2658

logger.warning("No clients defined")

2227

2228

if not debug:

2229

try:

2230

with pidfile:

2231

pid = os.getpid()

2232

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

2233

del pidfile

2234

except IOError:

2235

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

2236

pidfilename, pid)

2237

except NameError:

2238

# "pidfile" was never created

2239

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

2240

2670

del pidfilename

2241

2242

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

2243

2671

2244

2672

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

2245

2673

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

2246

2674

2247

2675

if use_dbus:

2248

class MandosDBusService(dbus.service.Object):

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2249

2679

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

2250

2680

def __init__(self):

2251

2681

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

2252

2682

_interface = "se.recompile.Mandos"

2253

2683

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2254

2690

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

2255

2691

def ClientAdded(self, objpath):

2256

2692

"D-Bus signal"

2298

2734

2299

2735

del _interface

2300

2736

2301

class MandosDBusServiceTransitional(MandosDBusService):

2302

__metaclass__ = AlternateDBusNamesMetaclass

2303

mandos_dbus_service = MandosDBusServiceTransitional()

2737

mandos_dbus_service = MandosDBusService()

2304

2738

2305

2739

def cleanup():

2306

2740

"Cleanup function; run on exit"

2307

2741

service.cleanup()

2308

2742

2309

2743

multiprocessing.active_children()

2744

wnull.close()

2310

2745

if not (tcp_server.clients or client_settings):

2311

2746

return

2312

2747

2313

2748

# Store client before exiting. Secrets are encrypted with key

2314

2749

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

2315

2750

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

2316

clients = []

2317

for client in tcp_server.clients.itervalues():

2318

client.encrypt_secret(

2319

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

2320

2321

client_dict = {}

2322

2323

# A list of attributes that will not be stored when

2324

# shutting down.

2325

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

2326

for name, typ in inspect.getmembers(dbus.service.Object):

2327

exclude.add(name)

2328

2329

client_dict["encrypted_secret"] = client.encrypted_secret

2330

for attr in client.client_structure:

2331

if attr not in exclude:

2332

client_dict[attr] = getattr(client, attr)

2333

2334

clients.append(client_dict)

2335

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

2336

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

2337

2776

try:

2338

with os.fdopen(os.open(stored_state_path,

2339

os.O_CREAT|os.O_WRONLY|os.O_TRUNC,

2340

stat.S_IRUSR | stat.S_IWUSR),

2341

"wb") as stored_state:

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:

2342

2781

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

2343

except IOError as e:

2344

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

2345

.format(e))

2346

if e.errno != errno.ENOENT:

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)

2347

2796

raise

2348

2797

2349

2798

# Delete all clients, and settings from config

2350

2799

while tcp_server.clients:

2351

2800

name, client = tcp_server.clients.popitem()

2369

2818

# Need to initiate checking of clients

2370

2819

if client.enabled:

2371

2820

client.init_checker()

2372

2373

2821

2374

2822

tcp_server.enable()

2375

2823

tcp_server.server_activate()

2378

2826

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

2379

2827

if use_ipv6:

2380

2828

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

2381

" flowinfo %d, scope_id %d"

2382

% tcp_server.socket.getsockname())

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2383

2831

else: # IPv4

2384

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

2385

% tcp_server.socket.getsockname())

2832

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

2833

*tcp_server.socket.getsockname())

2386

2834

2387

2835

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

2388

2836

2391

2839

try:

2392

2840

service.activate()

2393

2841

except dbus.exceptions.DBusException as error:

2394

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

2842

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

2395

2843

cleanup()

2396

2844

sys.exit(1)

2397

2845

# End of Avahi example code

2404

2852

logger.debug("Starting main loop")

2405

2853

main_loop.run()

2406

2854

except AvahiError as error:

2407

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

2855

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

2408

2856

cleanup()

2409

2857

sys.exit(1)

2410

2858

except KeyboardInterrupt:

2415

2863

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

2416

2864

cleanup()

2417

2865

2418

2419

2866

if __name__ == '__main__':

2420

2867

main()