/mandos/trunk : revision 518.2.3

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

67

65

import types

68

66

import binascii

69

67

import tempfile

70

import itertools

71

68

72

69

import dbus

73

70

import dbus.service

88

85

except ImportError:

89

86

SO_BINDTODEVICE = None

90

87

91

version = "1.5.4"

88

89

version = "1.4.1"

92

90

stored_state_file = "clients.pickle"

93

91

94

92

logger = logging.getLogger()

113

111

return interface_index

114

112

115

113

116

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

114

def initlogger(level=logging.WARNING):

117

115

"""init logger and add loglevel"""

118

116

119

117

syslogger.setFormatter(logging.Formatter

121

119

' %(message)s'))

122

120

logger.addHandler(syslogger)

123

121

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)

122

console = logging.StreamHandler()

123

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

124

' [%(process)d]:'

125

' %(levelname)s:'

126

' %(message)s'))

127

logger.addHandler(console)

131

128

logger.setLevel(level)

132

129

133

130

134

class PGPError(Exception):

135

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

131

class CryptoError(Exception):

136

132

pass

137

133

138

134

139

class PGPEngine(object):

135

class Crypto(object):

140

136

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

141

137

def __init__(self):

142

138

self.gnupg = GnuPGInterface.GnuPG()

145

141

self.gnupg.options.meta_interactive = False

146

142

self.gnupg.options.homedir = self.tempdir

147

143

self.gnupg.options.extra_args.extend(['--force-mdc',

148

'--quiet',

149

'--no-use-agent'])

144

'--quiet'])

150

145

151

146

def __enter__(self):

152

147

return self

178

173

179

174

def encrypt(self, data, password):

180

175

self.gnupg.passphrase = self.password_encode(password)

181

with open(os.devnull, "w") as devnull:

176

with open(os.devnull) as devnull:

182

177

try:

183

178

proc = self.gnupg.run(['--symmetric'],

184

179

create_fhs=['stdin', 'stdout'],

189

184

ciphertext = f.read()

190

185

proc.wait()

191

186

except IOError as e:

192

raise PGPError(e)

187

raise CryptoError(e)

193

188

self.gnupg.passphrase = None

194

189

return ciphertext

195

190

196

191

def decrypt(self, data, password):

197

192

self.gnupg.passphrase = self.password_encode(password)

198

with open(os.devnull, "w") as devnull:

193

with open(os.devnull) as devnull:

199

194

try:

200

195

proc = self.gnupg.run(['--decrypt'],

201

196

create_fhs=['stdin', 'stdout'],

202

197

attach_fhs={'stderr': devnull})

203

with contextlib.closing(proc.handles['stdin']) as f:

198

with contextlib.closing(proc.handles['stdin'] ) as f:

204

199

f.write(data)

205

200

with contextlib.closing(proc.handles['stdout']) as f:

206

201

decrypted_plaintext = f.read()

207

202

proc.wait()

208

203

except IOError as e:

209

raise PGPError(e)

204

raise CryptoError(e)

210

205

self.gnupg.passphrase = None

211

206

return decrypted_plaintext

212

207

213

208

209

214

210

class AvahiError(Exception):

215

211

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

216

212

self.value = value

245

241

server: D-Bus Server

246

242

bus: dbus.SystemBus()

247

243

"""

248

249

244

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

250

245

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

251

246

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

264

259

self.server = None

265

260

self.bus = bus

266

261

self.entry_group_state_changed_match = None

267

268

262

def rename(self):

269

263

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

270

264

if self.rename_count >= self.max_renames:

280

274

try:

281

275

self.add()

282

276

except dbus.exceptions.DBusException as error:

283

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

277

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

284

278

self.cleanup()

285

279

os._exit(1)

286

280

self.rename_count += 1

287

288

281

def remove(self):

289

282

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

290

283

if self.entry_group_state_changed_match is not None:

292

285

self.entry_group_state_changed_match = None

293

286

if self.group is not None:

294

287

self.group.Reset()

295

296

288

def add(self):

297

289

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

298

290

self.remove()

315

307

dbus.UInt16(self.port),

316

308

avahi.string_array_to_txt_array(self.TXT))

317

309

self.group.Commit()

318

319

310

def entry_group_state_changed(self, state, error):

320

311

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

321

312

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

328

319

elif state == avahi.ENTRY_GROUP_FAILURE:

329

320

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

330

321

unicode(error))

331

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

332

.format(error))

333

322

raise AvahiGroupError("State changed: %s"

323

% unicode(error))

334

324

def cleanup(self):

335

325

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

336

326

if self.group is not None:

341

331

pass

342

332

self.group = None

343

333

self.remove()

344

345

334

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

346

335

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

347

336

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

366

355

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

367

356

else:

368

357

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

369

370

358

def activate(self):

371

359

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

372

360

if self.server is None:

379

367

self.server_state_changed)

380

368

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

381

369

382

383

370

class AvahiServiceToSyslog(AvahiService):

384

371

def rename(self):

385

372

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

386

373

ret = AvahiService.rename(self)

387

374

syslogger.setFormatter(logging.Formatter

388

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

389

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

390

.format(self.name)))

375

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

376

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

377

% self.name))

391

378

return ret

392

379

393

394

def timedelta_to_milliseconds(td):

380

def _timedelta_to_milliseconds(td):

395

381

"Convert a datetime.timedelta() to milliseconds"

396

382

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

397

383

+ (td.seconds * 1000)

398

384

+ (td.microseconds // 1000))

399

400

385

401

386

class Client(object):

402

387

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

403

388

404

389

Attributes:

405

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

390

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

406

391

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

407

392

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

408

393

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

426

411

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

427

412

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

428

413

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

414

429

415

last_checker_status: integer between 0 and 255 reflecting exit

430

416

status of last checker. -1 reflects crashed

431

checker, -2 means no checker completed yet.

417

checker, or None.

432

418

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

433

419

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

434

420

D-Bus identifiers

435

421

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

436

422

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

437

423

until this client is disabled

438

extended_timeout: extra long timeout when secret has been sent

424

extended_timeout: extra long timeout when password has been sent

439

425

runtime_expansions: Allowed attributes for runtime expansion.

440

426

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

441

427

disabled, or None

442

428

"""

443

429

444

430

runtime_expansions = ("approval_delay", "approval_duration",

445

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

446

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

447

"last_approval_request", "last_checked_ok",

431

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

432

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

448

433

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

449

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

450

"extended_timeout": "15m",

451

"interval": "2m",

452

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

453

"host": "",

454

"approval_delay": "0s",

455

"approval_duration": "1s",

456

"approved_by_default": "True",

457

"enabled": "True",

458

}

459

434

460

435

def timeout_milliseconds(self):

461

436

"Return the 'timeout' attribute in milliseconds"

462

return timedelta_to_milliseconds(self.timeout)

437

return _timedelta_to_milliseconds(self.timeout)

463

438

464

439

def extended_timeout_milliseconds(self):

465

440

"Return the 'extended_timeout' attribute in milliseconds"

466

return timedelta_to_milliseconds(self.extended_timeout)

441

return _timedelta_to_milliseconds(self.extended_timeout)

467

442

468

443

def interval_milliseconds(self):

469

444

"Return the 'interval' attribute in milliseconds"

470

return timedelta_to_milliseconds(self.interval)

445

return _timedelta_to_milliseconds(self.interval)

471

446

472

447

def approval_delay_milliseconds(self):

473

return timedelta_to_milliseconds(self.approval_delay)

474

475

@staticmethod

476

def config_parser(config):

477

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

478

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

479

with exceptions for any special settings as defined above.

480

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

481

value given the same arguments.

482

"""

483

settings = {}

484

for client_name in config.sections():

485

section = dict(config.items(client_name))

486

client = settings[client_name] = {}

487

488

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

489

# Reformat values from string types to Python types

490

client["approved_by_default"] = config.getboolean(

491

client_name, "approved_by_default")

492

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

493

"enabled")

494

495

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

496

.replace(" ", ""))

497

if "secret" in section:

498

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

499

elif "secfile" in section:

500

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

501

(section["secfile"])),

502

"rb") as secfile:

503

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

504

else:

505

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

506

.format(section))

507

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

508

client["extended_timeout"] = string_to_delta(

509

section["extended_timeout"])

510

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

511

client["approval_delay"] = string_to_delta(

512

section["approval_delay"])

513

client["approval_duration"] = string_to_delta(

514

section["approval_duration"])

515

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

516

client["last_approval_request"] = None

517

client["last_checked_ok"] = None

518

client["last_checker_status"] = -2

519

520

return settings

521

522

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

448

return _timedelta_to_milliseconds(self.approval_delay)

449

450

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

451

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

452

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

453

attribute."""

523

454

self.name = name

524

# adding all client settings

525

for setting, value in settings.iteritems():

526

setattr(self, setting, value)

527

528

if self.enabled:

529

if not hasattr(self, "last_enabled"):

530

self.last_enabled = datetime.datetime.utcnow()

531

if not hasattr(self, "expires"):

532

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

533

+ self.timeout)

534

else:

535

self.last_enabled = None

536

self.expires = None

537

455

if config is None:

456

config = {}

538

457

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

539

458

# Uppercase and remove spaces from fingerprint for later

540

459

# comparison purposes with return value from the fingerprint()

541

460

# function

461

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

462

.replace(" ", ""))

542

463

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

543

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

544

datetime.datetime.utcnow())

545

546

# attributes specific for this server instance

464

if "secret" in config:

465

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

466

elif "secfile" in config:

467

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

468

(config["secfile"])),

469

"rb") as secfile:

470

self.secret = secfile.read()

471

else:

472

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

473

% self.name)

474

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

475

self.created = datetime.datetime.utcnow()

476

self.enabled = config.get("enabled", True)

477

self.last_approval_request = None

478

if self.enabled:

479

self.last_enabled = datetime.datetime.utcnow()

480

else:

481

self.last_enabled = None

482

self.last_checked_ok = None

483

self.last_checker_status = None

484

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

485

self.extended_timeout = string_to_delta(config

486

["extended_timeout"])

487

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

547

488

self.checker = None

548

489

self.checker_initiator_tag = None

549

490

self.disable_initiator_tag = None

491

if self.enabled:

492

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

493

else:

494

self.expires = None

550

495

self.checker_callback_tag = None

496

self.checker_command = config["checker"]

551

497

self.current_checker_command = None

552

self.approved = None

498

self._approved = None

499

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

500

True)

553

501

self.approvals_pending = 0

502

self.approval_delay = string_to_delta(

503

config["approval_delay"])

504

self.approval_duration = string_to_delta(

505

config["approval_duration"])

554

506

self.changedstate = (multiprocessing_manager

555

507

.Condition(multiprocessing_manager

556

508

.Lock()))

576

528

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

577

529

# Already enabled

578

530

return

531

self.send_changedstate()

579

532

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

580

533

self.enabled = True

581

534

self.last_enabled = datetime.datetime.utcnow()

582

535

self.init_checker()

583

self.send_changedstate()

584

536

585

537

def disable(self, quiet=True):

586

538

"""Disable this client."""

587

539

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

588

540

return False

589

541

if not quiet:

542

self.send_changedstate()

543

if not quiet:

590

544

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

591

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

545

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

592

546

gobject.source_remove(self.disable_initiator_tag)

593

547

self.disable_initiator_tag = None

594

548

self.expires = None

595

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

549

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

596

550

gobject.source_remove(self.checker_initiator_tag)

597

551

self.checker_initiator_tag = None

598

552

self.stop_checker()

599

553

self.enabled = False

600

if not quiet:

601

self.send_changedstate()

602

554

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

603

555

return False

604

556

608

560

def init_checker(self):

609

561

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

610

562

# and every interval from then on.

611

if self.checker_initiator_tag is not None:

612

gobject.source_remove(self.checker_initiator_tag)

613

563

self.checker_initiator_tag = (gobject.timeout_add

614

564

(self.interval_milliseconds(),

615

565

self.start_checker))

616

566

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

617

if self.disable_initiator_tag is not None:

618

gobject.source_remove(self.disable_initiator_tag)

619

567

self.disable_initiator_tag = (gobject.timeout_add

620

568

(self.timeout_milliseconds(),

621

569

self.disable))

627

575

self.checker_callback_tag = None

628

576

self.checker = None

629

577

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

578

self.last_checker_status = os.WEXITSTATUS(condition)

631

579

if self.last_checker_status == 0:

632

580

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

633

581

vars(self))

640

588

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

641

589

vars(self))

642

590

643

def checked_ok(self):

644

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

645

self.last_checked_ok = datetime.datetime.utcnow()

646

self.last_checker_status = 0

647

self.bump_timeout()

648

649

def bump_timeout(self, timeout=None):

650

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

591

def checked_ok(self, timeout=None):

592

"""Bump up the timeout for this client.

593

594

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

595

alive and well.

596

"""

651

597

if timeout is None:

652

598

timeout = self.timeout

599

self.last_checked_ok = datetime.datetime.utcnow()

653

600

if self.disable_initiator_tag is not None:

654

601

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

602

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

657

603

self.disable_initiator_tag = (gobject.timeout_add

658

(timedelta_to_milliseconds

604

(_timedelta_to_milliseconds

659

605

(timeout), self.disable))

660

606

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

661

607

668

614

If a checker already exists, leave it running and do

669

615

nothing."""

670

616

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

671

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

672

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

673

# would inevitably timeout, since no checker would get a

674

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

617

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

618

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

619

# client would inevitably timeout, since no checker would get

620

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

675

621

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

676

622

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

677

623

# should be.

691

637

self.current_checker_command)

692

638

# Start a new checker if needed

693

639

if self.checker is None:

694

# Escape attributes for the shell

695

escaped_attrs = dict(

696

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

697

for attr in

698

self.runtime_expansions)

699

640

try:

700

command = self.checker_command % escaped_attrs

701

except TypeError as error:

702

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

703

self.checker_command, exc_info=error)

704

return True # Try again later

641

# In case checker_command has exactly one % operator

642

command = self.checker_command % self.host

643

except TypeError:

644

# Escape attributes for the shell

645

escaped_attrs = dict(

646

(attr,

647

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

648

errors=

649

'replace')))

650

for attr in

651

self.runtime_expansions)

652

653

try:

654

command = self.checker_command % escaped_attrs

655

except TypeError as error:

656

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

657

' %s', self.checker_command, error)

658

return True # Try again later

705

659

self.current_checker_command = command

706

660

try:

707

661

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

713

667

self.checker = subprocess.Popen(command,

714

668

close_fds=True,

715

669

shell=True, cwd="/")

670

self.checker_callback_tag = (gobject.child_watch_add

671

(self.checker.pid,

672

self.checker_callback,

673

data=command))

674

# The checker may have completed before the gobject

675

# watch was added. Check for this.

676

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

677

if pid:

678

gobject.source_remove(self.checker_callback_tag)

679

self.checker_callback(pid, status, command)

716

680

except OSError as error:

717

logger.error("Failed to start subprocess",

718

exc_info=error)

719

self.checker_callback_tag = (gobject.child_watch_add

720

(self.checker.pid,

721

self.checker_callback,

722

data=command))

723

# The checker may have completed before the gobject

724

# watch was added. Check for this.

725

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

726

if pid:

727

gobject.source_remove(self.checker_callback_tag)

728

self.checker_callback(pid, status, command)

681

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

682

error)

729

683

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

730

684

return True

731

685

738

692

return

739

693

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

740

694

try:

741

self.checker.terminate()

695

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

742

696

#time.sleep(0.5)

743

697

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

744

# self.checker.kill()

698

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

745

699

except OSError as error:

746

700

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

747

701

raise

764

718

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

765

719

if byte_arrays and signature != "ay":

766

720

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

767

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

721

" signature %r" % signature)

768

722

def decorator(func):

769

723

func._dbus_is_property = True

770

724

func._dbus_interface = dbus_interface

778

732

return decorator

779

733

780

734

781

def dbus_interface_annotations(dbus_interface):

782

"""Decorator for marking functions returning interface annotations

783

784

Usage:

785

786

@dbus_interface_annotations("org.example.Interface")

787

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

788

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

789

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

790

"false"}

791

"""

792

def decorator(func):

793

func._dbus_is_interface = True

794

func._dbus_interface = dbus_interface

795

func._dbus_name = dbus_interface

796

return func

797

return decorator

798

799

800

def dbus_annotations(annotations):

801

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

802

Usage:

803

804

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

805

access="r")

806

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

807

"org.freedesktop.DBus.Property."

808

"EmitsChangedSignal": "false"})

809

def Property_dbus_property(self):

810

return dbus.Boolean(False)

811

"""

812

def decorator(func):

813

func._dbus_annotations = annotations

814

return func

815

return decorator

816

817

818

735

class DBusPropertyException(dbus.exceptions.DBusException):

819

736

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

820

737

"""

843

760

"""

844

761

845

762

@staticmethod

846

def _is_dbus_thing(thing):

847

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

848

849

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

850

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

851

"""

852

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

853

False)

763

def _is_dbus_property(obj):

764

return getattr(obj, "_dbus_is_property", False)

854

765

855

def _get_all_dbus_things(self, thing):

766

def _get_all_dbus_properties(self):

856

767

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

857

768

"""

858

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

859

name),

860

athing.__get__(self))

769

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

861

770

for cls in self.__class__.__mro__

862

for name, athing in

863

inspect.getmembers(cls,

864

self._is_dbus_thing(thing)))

771

for name, prop in

772

inspect.getmembers(cls, self._is_dbus_property))

865

773

866

774

def _get_dbus_property(self, interface_name, property_name):

867

775

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

869

777

"""

870

778

for cls in self.__class__.__mro__:

871

779

for name, value in (inspect.getmembers

872

(cls,

873

self._is_dbus_thing("property"))):

780

(cls, self._is_dbus_property)):

874

781

if (value._dbus_name == property_name

875

782

and value._dbus_interface == interface_name):

876

783

return value.__get__(self)

905

812

# signatures other than "ay".

906

813

if prop._dbus_signature != "ay":

907

814

raise ValueError

908

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

909

for byte in value))

815

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

816

for byte in value))

910

817

prop(value)

911

818

912

819

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

918

825

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

919

826

"""

920

827

properties = {}

921

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

828

for name, prop in self._get_all_dbus_properties():

922

829

if (interface_name

923

830

and interface_name != prop._dbus_interface):

924

831

# Interface non-empty but did not match

939

846

path_keyword='object_path',

940

847

connection_keyword='connection')

941

848

def Introspect(self, object_path, connection):

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

849

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

945

850

"""

946

851

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

947

852

connection)

954

859

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

955

860

return e

956

861

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

957

# Add property tags

958

862

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

959

863

for name, prop

960

in self._get_all_dbus_things("property")

864

in self._get_all_dbus_properties()

961

865

if prop._dbus_interface

962

866

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

963

867

if_tag.appendChild(tag)

964

# Add annotation tags

965

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

966

for tag in if_tag.getElementsByTagName(typ):

967

annots = dict()

968

for name, prop in (self.

969

_get_all_dbus_things(typ)):

970

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

971

and prop._dbus_interface

972

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

973

annots.update(getattr

974

(prop,

975

"_dbus_annotations",

976

{}))

977

for name, value in annots.iteritems():

978

ann_tag = document.createElement(

979

"annotation")

980

ann_tag.setAttribute("name", name)

981

ann_tag.setAttribute("value", value)

982

tag.appendChild(ann_tag)

983

# Add interface annotation tags

984

for annotation, value in dict(

985

itertools.chain.from_iterable(

986

annotations().iteritems()

987

for name, annotations in

988

self._get_all_dbus_things("interface")

989

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

990

)).iteritems():

991

ann_tag = document.createElement("annotation")

992

ann_tag.setAttribute("name", annotation)

993

ann_tag.setAttribute("value", value)

994

if_tag.appendChild(ann_tag)

995

868

# Add the names to the return values for the

996

869

# "org.freedesktop.DBus.Properties" methods

997

870

if (if_tag.getAttribute("name")

1012

885

except (AttributeError, xml.dom.DOMException,

1013

886

xml.parsers.expat.ExpatError) as error:

1014

887

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

1015

exc_info=error)

888

error)

1016

889

return xmlstring

1017

890

1018

891

1024

897

variant_level=variant_level)

1025

898

1026

899

1027

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1028

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

1029

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

1030

interface names according to the "alt_interface_names" mapping.

1031

Usage:

1032

1033

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

1034

"net.example.AlternateInterface"})

1035

class SampleDBusObject(dbus.service.Object):

1036

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

1037

def SampleDBusMethod():

1038

pass

1039

1040

The above "SampleDBusMethod" on "SampleDBusObject" will be

1041

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

1042

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

1043

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

1044

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

1045

1046

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

1047

(from DBusObjectWithProperties) and interfaces (from the

1048

dbus_interface_annotations decorator).

900

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

901

.__metaclass__):

902

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

903

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

1049

904

"""

1050

def wrapper(cls):

1051

for orig_interface_name, alt_interface_name in (

1052

alt_interface_names.iteritems()):

1053

attr = {}

1054

interface_names = set()

1055

# Go though all attributes of the class

1056

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

905

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

906

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

907

# methods, signals, or properties in them

908

for base in (b for b in bases

909

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

910

# Go though all attributes of the base class

911

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

1057

912

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

1058

913

# with the wrong interface name

1059

914

if (not hasattr(attribute, "_dbus_interface")

1060

915

or not attribute._dbus_interface

1061

.startswith(orig_interface_name)):

916

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

1062

917

continue

1063

918

# Create an alternate D-Bus interface name based on

1064

919

# the current name

1065

920

alt_interface = (attribute._dbus_interface

1066

.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

921

.replace("se.recompile.Mandos",

922

"se.bsnet.fukt.Mandos"))

1069

923

# Is this a D-Bus signal?

1070

924

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

1071

925

# Extract the original non-method function by

1086

940

nonmethod_func.func_name,

1087

941

nonmethod_func.func_defaults,

1088

942

nonmethod_func.func_closure)))

1089

# Copy annotations, if any

1090

try:

1091

new_function._dbus_annotations = (

1092

dict(attribute._dbus_annotations))

1093

except AttributeError:

1094

pass

1095

943

# Define a creator of a function to call both the

1096

# original and alternate functions, so both the

1097

# original and alternate signals gets sent when

1098

# the function is called

944

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

945

# signals gets sent when the function is called

1099

946

def fixscope(func1, func2):

1100

947

"""This function is a scope container to pass

1101

948

func1 and func2 to the "call_both" function

1108

955

return call_both

1109

956

# Create the "call_both" function and add it to

1110

957

# the class

1111

attr[attrname] = fixscope(attribute, new_function)

958

attr[attrname] = fixscope(attribute,

959

new_function)

1112

960

# Is this a D-Bus method?

1113

961

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

1114

962

# Create a new, but exactly alike, function

1125

973

attribute.func_name,

1126

974

attribute.func_defaults,

1127

975

attribute.func_closure)))

1128

# Copy annotations, if any

1129

try:

1130

attr[attrname]._dbus_annotations = (

1131

dict(attribute._dbus_annotations))

1132

except AttributeError:

1133

pass

1134

976

# Is this a D-Bus property?

1135

977

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

1136

978

# Create a new, but exactly alike, function

1150

992

attribute.func_name,

1151

993

attribute.func_defaults,

1152

994

attribute.func_closure)))

1153

# Copy annotations, if any

1154

try:

1155

attr[attrname]._dbus_annotations = (

1156

dict(attribute._dbus_annotations))

1157

except AttributeError:

1158

pass

1159

# Is this a D-Bus interface?

1160

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

1161

# Create a new, but exactly alike, function

1162

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

1163

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

1164

# to the class.

1165

attr[attrname] = (dbus_interface_annotations

1166

(alt_interface)

1167

(types.FunctionType

1168

(attribute.func_code,

1169

attribute.func_globals,

1170

attribute.func_name,

1171

attribute.func_defaults,

1172

attribute.func_closure)))

1173

if deprecate:

1174

# Deprecate all alternate interfaces

1175

iname="_AlternateDBusNames_interface_annotation{0}"

1176

for interface_name in interface_names:

1177

@dbus_interface_annotations(interface_name)

1178

def func(self):

1179

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

1180

"true" }

1181

# Find an unused name

1182

for aname in (iname.format(i)

1183

for i in itertools.count()):

1184

if aname not in attr:

1185

attr[aname] = func

1186

break

1187

if interface_names:

1188

# Replace the class with a new subclass of it with

1189

# methods, signals, etc. as created above.

1190

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

1191

(cls,), attr)

1192

return cls

1193

return wrapper

1194

1195

1196

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

1197

"se.bsnet.fukt.Mandos"})

995

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

996

997

1198

998

class ClientDBus(Client, DBusObjectWithProperties):

1199

999

"""A Client class using D-Bus

1200

1000

1211

1011

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

1212

1012

self.bus = bus

1213

1013

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

1014

1015

self._approvals_pending = 0

1214

1016

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

1215

1017

# the D-Bus

1216

1018

client_object_name = unicode(self.name).translate(

1220

1022

("/clients/" + client_object_name))

1221

1023

DBusObjectWithProperties.__init__(self, self.bus,

1222

1024

self.dbus_object_path)

1223

1025

1224

1026

def notifychangeproperty(transform_func,

1225

1027

dbus_name, type_func=lambda x: x,

1226

1028

variant_level=1):

1249

1051

1250

1052

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

1251

1053

1054

1252

1055

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1253

1056

approvals_pending = notifychangeproperty(dbus.Boolean,

1254

1057

"ApprovalPending",

1261

1064

checker is not None)

1262

1065

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1263

1066

"LastCheckedOK")

1264

last_checker_status = notifychangeproperty(dbus.Int16,

1265

"LastCheckerStatus")

1266

1067

last_approval_request = notifychangeproperty(

1267

1068

datetime_to_dbus, "LastApprovalRequest")

1268

1069

approved_by_default = notifychangeproperty(dbus.Boolean,

1269

1070

"ApprovedByDefault")

1270

approval_delay = notifychangeproperty(dbus.UInt64,

1071

approval_delay = notifychangeproperty(dbus.UInt16,

1271

1072

"ApprovalDelay",

1272

1073

type_func =

1273

timedelta_to_milliseconds)

1074

_timedelta_to_milliseconds)

1274

1075

approval_duration = notifychangeproperty(

1275

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

1076

dbus.UInt16, "ApprovalDuration",

1077

type_func = _timedelta_to_milliseconds)

1277

1078

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

1278

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

1079

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

1279

1080

type_func =

1280

timedelta_to_milliseconds)

1081

_timedelta_to_milliseconds)

1281

1082

extended_timeout = notifychangeproperty(

1282

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1284

interval = notifychangeproperty(dbus.UInt64,

1083

dbus.UInt16, "ExtendedTimeout",

1084

type_func = _timedelta_to_milliseconds)

1085

interval = notifychangeproperty(dbus.UInt16,

1285

1086

"Interval",

1286

1087

type_func =

1287

timedelta_to_milliseconds)

1088

_timedelta_to_milliseconds)

1288

1089

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

1289

1090

1290

1091

del notifychangeproperty

1332

1133

return r

1333

1134

1334

1135

def _reset_approved(self):

1335

self.approved = None

1136

self._approved = None

1336

1137

return False

1337

1138

1338

1139

def approve(self, value=True):

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1140

self.send_changedstate()

1141

self._approved = value

1142

gobject.timeout_add(_timedelta_to_milliseconds

1341

1143

(self.approval_duration),

1342

1144

self._reset_approved)

1343

self.send_changedstate()

1145

1344

1146

1345

1147

## D-Bus methods, signals & properties

1346

1148

_interface = "se.recompile.Mandos.Client"

1347

1149

1348

## Interfaces

1349

1350

@dbus_interface_annotations(_interface)

1351

def _foo(self):

1352

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

1353

"false"}

1354

1355

1150

## Signals

1356

1151

1357

1152

# CheckerCompleted - signal

1393

1188

"D-Bus signal"

1394

1189

return self.need_approval()

1395

1190

1191

# NeRwequest - signal

1192

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

1193

def NewRequest(self, ip):

1194

"""D-Bus signal

1195

Is sent after a client request a password.

1196

"""

1197

pass

1198

1396

1199

## Methods

1397

1200

1398

1201

# Approve - method

1456

1259

access="readwrite")

1457

1260

def ApprovalDuration_dbus_property(self, value=None):

1458

1261

if value is None: # get

1459

return dbus.UInt64(timedelta_to_milliseconds(

1262

return dbus.UInt64(_timedelta_to_milliseconds(

1460

1263

self.approval_duration))

1461

1264

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

1462

1265

1476

1279

def Host_dbus_property(self, value=None):

1477

1280

if value is None: # get

1478

1281

return dbus.String(self.host)

1479

self.host = unicode(value)

1282

self.host = value

1480

1283

1481

1284

# Created - property

1482

1285

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

1508

1311

return

1509

1312

return datetime_to_dbus(self.last_checked_ok)

1510

1313

1511

# LastCheckerStatus - property

1512

@dbus_service_property(_interface, signature="n",

1513

access="read")

1514

def LastCheckerStatus_dbus_property(self):

1515

return dbus.Int16(self.last_checker_status)

1516

1517

1314

# Expires - property

1518

1315

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

1519

1316

def Expires_dbus_property(self):

1530

1327

def Timeout_dbus_property(self, value=None):

1531

1328

if value is None: # get

1532

1329

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1534

1330

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

1535

# Reschedule disabling

1536

if self.enabled:

1537

now = datetime.datetime.utcnow()

1538

self.expires += self.timeout - old_timeout

1539

if self.expires <= now:

1540

# The timeout has passed

1541

self.disable()

1542

else:

1543

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

1544

is None):

1545

return

1546

gobject.source_remove(self.disable_initiator_tag)

1547

self.disable_initiator_tag = (

1548

gobject.timeout_add(

1549

timedelta_to_milliseconds(self.expires - now),

1550

self.disable))

1331

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

1332

return

1333

# Reschedule timeout

1334

gobject.source_remove(self.disable_initiator_tag)

1335

self.disable_initiator_tag = None

1336

self.expires = None

1337

time_to_die = _timedelta_to_milliseconds((self

1338

.last_checked_ok

1339

+ self.timeout)

1340

- datetime.datetime

1341

.utcnow())

1342

if time_to_die <= 0:

1343

# The timeout has passed

1344

self.disable()

1345

else:

1346

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

1347

+ datetime.timedelta(milliseconds =

1348

time_to_die))

1349

self.disable_initiator_tag = (gobject.timeout_add

1350

(time_to_die, self.disable))

1551

1351

1552

1352

# ExtendedTimeout - property

1553

1353

@dbus_service_property(_interface, signature="t",

1579

1379

def Checker_dbus_property(self, value=None):

1580

1380

if value is None: # get

1581

1381

return dbus.String(self.checker_command)

1582

self.checker_command = unicode(value)

1382

self.checker_command = value

1583

1383

1584

1384

# CheckerRunning - property

1585

1385

@dbus_service_property(_interface, signature="b",

1614

1414

raise KeyError()

1615

1415

1616

1416

def __getattribute__(self, name):

1617

if name == '_pipe':

1417

if(name == '_pipe'):

1618

1418

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

1619

1419

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

1620

1420

data = self._pipe.recv()

1627

1427

return func

1628

1428

1629

1429

def __setattr__(self, name, value):

1630

if name == '_pipe':

1430

if(name == '_pipe'):

1631

1431

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

1632

1432

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

1633

1433

1634

1434

1435

class ClientDBusTransitional(ClientDBus):

1436

__metaclass__ = AlternateDBusNamesMetaclass

1437

1438

1635

1439

class ClientHandler(socketserver.BaseRequestHandler, object):

1636

1440

"""A class to handle client connections.

1637

1441

1698

1502

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

1699

1503

return

1700

1504

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

1505

if self.server.use_dbus:

1506

# Emit D-Bus signal

1507

client.NewRequest(str(self.client_address))

1701

1508

1702

1509

try:

1703

1510

client = ProxyClient(child_pipe, fpr,

1719

1526

client.Rejected("Disabled")

1720

1527

return

1721

1528

1722

if client.approved or not client.approval_delay:

1529

if client._approved or not client.approval_delay:

1723

1530

#We are approved or approval is disabled

1724

1531

break

1725

elif client.approved is None:

1532

elif client._approved is None:

1726

1533

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

1727

1534

client.name)

1728

1535

if self.server.use_dbus:

1741

1548

#wait until timeout or approved

1742

1549

time = datetime.datetime.now()

1743

1550

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1551

(client.changedstate.wait

1552

(float(client._timedelta_to_milliseconds(delay)

1553

/ 1000)))

1747

1554

client.changedstate.release()

1748

1555

time2 = datetime.datetime.now()

1749

1556

if (time2 - time) >= delay:

1765

1572

try:

1766

1573

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

1767

1574

except gnutls.errors.GNUTLSError as error:

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1575

logger.warning("gnutls send failed")

1770

1576

return

1771

1577

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

1772

1578

sent, len(client.secret)

1775

1581

1776

1582

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

1777

1583

# bump the timeout using extended_timeout

1778

client.bump_timeout(client.extended_timeout)

1584

client.checked_ok(client.extended_timeout)

1779

1585

if self.server.use_dbus:

1780

1586

# Emit D-Bus signal

1781

1587

client.GotSecret()

1786

1592

try:

1787

1593

session.bye()

1788

1594

except gnutls.errors.GNUTLSError as error:

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1595

logger.warning("GnuTLS bye failed")

1791

1596

1792

1597

@staticmethod

1793

1598

def peer_certificate(session):

1858

1663

def sub_process_main(self, request, address):

1859

1664

try:

1860

1665

self.finish_request(request, address)

1861

except Exception:

1666

except:

1862

1667

self.handle_error(request, address)

1863

1668

self.close_request(request)

1864

1669

1865

1670

def process_request(self, request, address):

1866

1671

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

1867

1672

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

1868

args = (request, address))

1673

args = (request,

1674

address))

1869

1675

proc.start()

1870

1676

return proc

1871

1677

1921

1727

str(self.interface

1922

1728

+ '\0'))

1923

1729

except socket.error as error:

1924

if error.errno == errno.EPERM:

1730

if error[0] == errno.EPERM:

1925

1731

logger.error("No permission to"

1926

1732

" bind to interface %s",

1927

1733

self.interface)

1928

elif error.errno == errno.ENOPROTOOPT:

1734

elif error[0] == errno.ENOPROTOOPT:

1929

1735

logger.error("SO_BINDTODEVICE not available;"

1930

1736

" cannot bind to interface %s",

1931

1737

self.interface)

1932

elif error.errno == errno.ENODEV:

1933

logger.error("Interface %s does not"

1934

" exist, cannot bind",

1935

self.interface)

1936

1738

else:

1937

1739

raise

1938

1740

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

1997

1799

1998

1800

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

1999

1801

proc = None, client_object=None):

1802

condition_names = {

1803

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

1804

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

1805

# blocking).

1806

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

1807

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

1808

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

1809

# broken, usually for pipes and

1810

# sockets).

1811

}

1812

conditions_string = ' | '.join(name

1813

for cond, name in

1814

condition_names.iteritems()

1815

if cond & condition)

2000

1816

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

2001

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

1817

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

2002

1818

# Wait for other process to exit

2003

1819

proc.join()

2004

1820

return False

2094

1910

elif suffix == "w":

2095

1911

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

2096

1912

else:

2097

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

2098

.format(suffix))

1913

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

2099

1914

except (ValueError, IndexError) as e:

2100

1915

raise ValueError(*(e.args))

2101

1916

timevalue += delta

2115

1930

sys.exit()

2116

1931

if not noclose:

2117

1932

# Close all standard open file descriptors

2118

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

1933

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

2119

1934

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

2120

1935

raise OSError(errno.ENODEV,

2121

"{0} not a character device"

2122

.format(os.devnull))

1936

"%s not a character device"

1937

% os.path.devnull)

2123

1938

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

2124

1939

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

2125

1940

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

2134

1949

2135

1950

parser = argparse.ArgumentParser()

2136

1951

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

2137

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

1952

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

2138

1953

help="show version number and exit")

2139

1954

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

2140

1955

help="Bind to interface IF")

2233

2048

stored_state_file)

2234

2049

2235

2050

if debug:

2236

initlogger(debug, logging.DEBUG)

2051

initlogger(logging.DEBUG)

2237

2052

else:

2238

2053

if not debuglevel:

2239

initlogger(debug)

2054

initlogger()

2240

2055

else:

2241

2056

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

2242

initlogger(debug, level)

2057

initlogger(level)

2243

2058

2244

2059

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

2245

2060

syslogger.setFormatter(logging.Formatter

2246

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

2247

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

2248

.format(server_settings

2249

["servicename"])))

2061

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

2062

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

2063

% server_settings["servicename"]))

2250

2064

2251

2065

# Parse config file with clients

2252

client_config = configparser.SafeConfigParser(Client

2253

.client_defaults)

2066

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

2067

"extended_timeout": "15m",

2068

"interval": "2m",

2069

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

2070

"host": "",

2071

"approval_delay": "0s",

2072

"approval_duration": "1s",

2073

}

2074

client_config = configparser.SafeConfigParser(client_defaults)

2254

2075

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

2255

2076

"clients.conf"))

2256

2077

2270

2091

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

2271

2092

try:

2272

2093

pidfile = open(pidfilename, "w")

2273

except IOError as e:

2274

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

2275

exc_info=e)

2094

except IOError:

2095

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

2276

2096

2277

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

2097

try:

2098

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

2099

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

2100

except KeyError:

2278

2101

try:

2279

uid = pwd.getpwnam(name).pw_uid

2280

gid = pwd.getpwnam(name).pw_gid

2281

break

2102

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

2103

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

2282

2104

except KeyError:

2283

continue

2284

else:

2285

uid = 65534

2286

gid = 65534

2105

try:

2106

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

2107

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

2108

except KeyError:

2109

uid = 65534

2110

gid = 65534

2287

2111

try:

2288

2112

os.setgid(gid)

2289

2113

os.setuid(uid)

2290

2114

except OSError as error:

2291

if error.errno != errno.EPERM:

2115

if error[0] != errno.EPERM:

2292

2116

raise error

2293

2117

2294

2118

if debug:

2306

2130

.gnutls_global_set_log_function(debug_gnutls))

2307

2131

2308

2132

# Redirect stdin so all checkers get /dev/null

2309

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

2133

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

2310

2134

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

2311

2135

if null > 2:

2312

2136

os.close(null)

2137

else:

2138

# No console logging

2139

logger.removeHandler(console)

2313

2140

2314

2141

# Need to fork before connecting to D-Bus

2315

2142

if not debug:

2316

2143

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

2317

2144

daemon()

2318

2145

2319

gobject.threads_init()

2320

2321

2146

global main_loop

2322

2147

# From the Avahi example code

2323

DBusGMainLoop(set_as_default=True)

2148

DBusGMainLoop(set_as_default=True )

2324

2149

main_loop = gobject.MainLoop()

2325

2150

bus = dbus.SystemBus()

2326

2151

# End of Avahi example code

2332

2157

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

2333

2158

do_not_queue=True))

2334

2159

except dbus.exceptions.NameExistsException as e:

2335

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

2160

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

2336

2161

use_dbus = False

2337

2162

server_settings["use_dbus"] = False

2338

2163

tcp_server.use_dbus = False

2350

2175

2351

2176

client_class = Client

2352

2177

if use_dbus:

2353

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

2354

2355

client_settings = Client.config_parser(client_config)

2178

client_class = functools.partial(ClientDBusTransitional,

2179

bus = bus)

2180

2181

special_settings = {

2182

# Some settings need to be accessd by special methods;

2183

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

2184

"approved_by_default":

2185

lambda section:

2186

client_config.getboolean(section, "approved_by_default"),

2187

"enabled":

2188

lambda section:

2189

client_config.getboolean(section, "enabled"),

2190

}

2191

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

2192

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

2193

# with exceptions for any special settings as defined above

2194

client_settings = dict((clientname,

2195

dict((setting,

2196

(value

2197

if setting not in special_settings

2198

else special_settings[setting]

2199

(clientname)))

2200

for setting, value in

2201

client_config.items(clientname)))

2202

for clientname in client_config.sections())

2203

2356

2204

old_client_settings = {}

2357

clients_data = {}

2205

clients_data = []

2358

2206

2359

2207

# Get client data and settings from last running state.

2360

2208

if server_settings["restore"]:

2364

2212

(stored_state))

2365

2213

os.remove(stored_state_path)

2366

2214

except IOError as e:

2367

if e.errno == errno.ENOENT:

2368

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

2369

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

2370

else:

2371

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

2372

exc_info=e)

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2373

2218

raise

2374

except EOFError as e:

2375

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

2376

"EOFError:", exc_info=e)

2377

2219

2378

with PGPEngine() as pgp:

2379

for client_name, client in clients_data.iteritems():

2220

with Crypto() as crypt:

2221

for client in clients_data:

2222

client_name = client["name"]

2223

2380

2224

# Decide which value to use after restoring saved state.

2381

2225

# We have three different values: Old config file,

2382

2226

# new config file, and saved state.

2390

2234

if (name != "secret" and

2391

2235

value != old_client_settings[client_name]

2392

2236

[name]):

2393

client[name] = value

2237

setattr(client, name, value)

2394

2238

except KeyError:

2395

2239

pass

2396

2240

2397

2241

# Clients who has passed its expire date can still be

2398

# enabled if its last checker was successful. Clients

2399

# whose checker succeeded before we stored its state is

2400

# assumed to have successfully run all checkers during

2401

# downtime.

2402

if client["enabled"]:

2403

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

2404

if not client["last_checked_ok"]:

2405

logger.warning(

2406

"disabling client {0} - Client never "

2407

"performed a successful checker"

2408

.format(client_name))

2409

client["enabled"] = False

2410

elif client["last_checker_status"] != 0:

2411

logger.warning(

2412

"disabling client {0} - Client "

2413

"last checker failed with error code {1}"

2414

.format(client_name,

2415

client["last_checker_status"]))

2242

# enabled if its last checker was sucessful. Clients

2243

# whose checker failed before we stored its state is

2244

# assumed to have failed all checkers during downtime.

2245

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

2246

if ((datetime.datetime.utcnow()

2247

- client["last_checked_ok"])

2248

> client["interval"]):

2249

if client["last_checker_status"] != 0:

2416

2250

client["enabled"] = False

2417

2251

else:

2418

2252

client["expires"] = (datetime.datetime

2419

2253

.utcnow()

2420

2254

+ client["timeout"])

2421

logger.debug("Last checker succeeded,"

2422

" keeping {0} enabled"

2423

.format(client_name))

2255

2256

client["changedstate"] = (multiprocessing_manager

2257

.Condition

2258

(multiprocessing_manager

2259

.Lock()))

2260

if use_dbus:

2261

new_client = (ClientDBusTransitional.__new__

2262

(ClientDBusTransitional))

2263

tcp_server.clients[client_name] = new_client

2264

new_client.bus = bus

2265

for name, value in client.iteritems():

2266

setattr(new_client, name, value)

2267

client_object_name = unicode(client_name).translate(

2268

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

2269

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

2270

new_client.dbus_object_path = (dbus.ObjectPath

2271

("/clients/"

2272

+ client_object_name))

2273

DBusObjectWithProperties.__init__(new_client,

2274

new_client.bus,

2275

new_client

2276

.dbus_object_path)

2277

else:

2278

tcp_server.clients[client_name] = (Client.__new__

2279

(Client))

2280

for name, value in client.iteritems():

2281

setattr(tcp_server.clients[client_name],

2282

name, value)

2283

2424

2284

try:

2425

client["secret"] = (

2426

pgp.decrypt(client["encrypted_secret"],

2427

client_settings[client_name]

2428

["secret"]))

2429

except PGPError:

2285

tcp_server.clients[client_name].secret = (

2286

crypt.decrypt(tcp_server.clients[client_name]

2287

.encrypted_secret,

2288

client_settings[client_name]

2289

["secret"]))

2290

except CryptoError:

2430

2291

# If decryption fails, we use secret from new settings

2431

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

2432

.format(client_name))

2433

client["secret"] = (

2292

tcp_server.clients[client_name].secret = (

2434

2293

client_settings[client_name]["secret"])

2435

2294

2436

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

2437

for client_name in (set(old_client_settings)

2438

- set(client_settings)):

2439

del clients_data[client_name]

2440

for client_name in (set(client_settings)

2441

- set(old_client_settings)):

2442

clients_data[client_name] = client_settings[client_name]

2443

2444

# Create all client objects

2445

for client_name, client in clients_data.iteritems():

2446

tcp_server.clients[client_name] = client_class(

2447

name = client_name, settings = client)

2295

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

2296

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

2297

del tcp_server.clients[clientname]

2298

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

2299

tcp_server.clients[clientname] = (client_class(name

2300

= clientname,

2301

config =

2302

client_settings

2303

[clientname]))

2448

2304

2449

2305

if not tcp_server.clients:

2450

2306

logger.warning("No clients defined")

2451

2307

2452

2308

if not debug:

2453

2309

try:

2454

2310

with pidfile:

2462

2318

# "pidfile" was never created

2463

2319

pass

2464

2320

del pidfilename

2321

2322

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

2465

2323

2466

2324

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

2467

2325

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

2468

2326

2469

2327

if use_dbus:

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

class MandosDBusService(DBusObjectWithProperties):

2328

class MandosDBusService(dbus.service.Object):

2473

2329

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

2474

2330

def __init__(self):

2475

2331

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

2476

2332

_interface = "se.recompile.Mandos"

2477

2333

2478

@dbus_interface_annotations(_interface)

2479

def _foo(self):

2480

return { "org.freedesktop.DBus.Property"

2481

".EmitsChangedSignal":

2482

"false"}

2483

2484

2334

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

2485

2335

def ClientAdded(self, objpath):

2486

2336

"D-Bus signal"

2528

2378

2529

2379

del _interface

2530

2380

2531

mandos_dbus_service = MandosDBusService()

2381

class MandosDBusServiceTransitional(MandosDBusService):

2382

__metaclass__ = AlternateDBusNamesMetaclass

2383

mandos_dbus_service = MandosDBusServiceTransitional()

2532

2384

2533

2385

def cleanup():

2534

2386

"Cleanup function; run on exit"

2541

2393

# Store client before exiting. Secrets are encrypted with key

2542

2394

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

2543

2395

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

2544

clients = {}

2545

with PGPEngine() as pgp:

2396

clients = []

2397

with Crypto() as crypt:

2546

2398

for client in tcp_server.clients.itervalues():

2547

2399

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

2548

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

2549

key)

2400

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

2401

key)

2550

2402

client_dict = {}

2551

2403

2552

# A list of attributes that can not be pickled

2553

# + secret.

2554

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

2555

"checker"))

2404

# A list of attributes that will not be stored when

2405

# shutting down.

2406

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

2556

2407

for name, typ in (inspect.getmembers

2557

2408

(dbus.service.Object)):

2558

2409

exclude.add(name)

2563

2414

if attr not in exclude:

2564

2415

client_dict[attr] = getattr(client, attr)

2565

2416

2566

clients[client.name] = client_dict

2417

clients.append(client_dict)

2567

2418

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

2568

2419

2569

2420

try:

2570

with (tempfile.NamedTemporaryFile

2571

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

2572

dir=os.path.dirname(stored_state_path),

2573

delete=False)) as stored_state:

2421

with os.fdopen(os.open(stored_state_path,

2422

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

2423

0600), "wb") as stored_state:

2574

2424

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

2575

tempname=stored_state.name

2576

os.rename(tempname, stored_state_path)

2577

2425

except (IOError, OSError) as e:

2578

if not debug:

2579

try:

2580

os.remove(tempname)

2581

except NameError:

2582

pass

2583

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

2584

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

2585

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

2586

else:

2587

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

2588

exc_info=e)

2589

raise e

2426

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

2427

.format(e))

2428

if e.errno not in (errno.ENOENT, errno.EACCES):

2429

raise

2590

2430

2591

2431

# Delete all clients, and settings from config

2592

2432

while tcp_server.clients:

2619

2459

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

2620

2460

if use_ipv6:

2621

2461

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

2622

" flowinfo %d, scope_id %d",

2623

*tcp_server.socket.getsockname())

2462

" flowinfo %d, scope_id %d"

2463

% tcp_server.socket.getsockname())

2624

2464

else: # IPv4

2625

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

2626

*tcp_server.socket.getsockname())

2465

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

2466

% tcp_server.socket.getsockname())

2627

2467

2628

2468

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

2629

2469

2632

2472

try:

2633

2473

service.activate()

2634

2474

except dbus.exceptions.DBusException as error:

2635

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

2475

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

2636

2476

cleanup()

2637

2477

sys.exit(1)

2638

2478

# End of Avahi example code

2645

2485

logger.debug("Starting main loop")

2646

2486

main_loop.run()

2647

2487

except AvahiError as error:

2648

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

2488

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

2649

2489

cleanup()

2650

2490

sys.exit(1)

2651

2491

except KeyboardInterrupt:

2656

2496

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

2657

2497

cleanup()

2658

2498

2499

2659

2500

if __name__ == '__main__':

2660

2501

main()