/mandos/trunk : revision 544

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

import collections

72

68

73

69

import dbus

74

70

import dbus.service

79

75

import ctypes.util

80

76

import xml.dom.minidom

81

77

import inspect

78

import GnuPGInterface

82

79

83

80

try:

84

81

SO_BINDTODEVICE = socket.SO_BINDTODEVICE

88

85

except ImportError:

89

86

SO_BINDTODEVICE = None

90

87

91

version = "1.6.4"

88

version = "1.4.1"

92

89

stored_state_file = "clients.pickle"

93

90

94

91

logger = logging.getLogger()

95

syslogger = None

92

syslogger = (logging.handlers.SysLogHandler

93

(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

94

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

96

95

97

96

try:

98

97

if_nametoindex = (ctypes.cdll.LoadLibrary

114

113

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

115

114

"""init logger and add loglevel"""

116

115

117

syslogger = (logging.handlers.SysLogHandler

118

(facility =

119

logging.handlers.SysLogHandler.LOG_DAEMON,

120

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

121

116

syslogger.setFormatter(logging.Formatter

122

117

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

123

118

' %(message)s'))

141

136

class PGPEngine(object):

142

137

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

143

138

def __init__(self):

139

self.gnupg = GnuPGInterface.GnuPG()

144

140

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

145

self.gnupgargs = ['--batch',

146

'--home', self.tempdir,

147

'--force-mdc',

148

'--quiet',

149

'--no-use-agent']

141

self.gnupg = GnuPGInterface.GnuPG()

142

self.gnupg.options.meta_interactive = False

143

self.gnupg.options.homedir = self.tempdir

144

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

145

'--quiet',

146

'--no-use-agent'])

150

147

151

148

def __enter__(self):

152

149

return self

153

150

154

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

151

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

155

152

self._cleanup()

156

153

return False

157

154

174

171

def password_encode(self, password):

175

172

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

176

173

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

177

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

178

if len(encoded) > 2048:

179

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

180

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

181

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

182

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

183

return encoded

174

return b"mandos" + binascii.hexlify(password)

184

175

185

176

def encrypt(self, data, password):

186

passphrase = self.password_encode(password)

187

with tempfile.NamedTemporaryFile(dir=self.tempdir

188

) as passfile:

189

passfile.write(passphrase)

190

passfile.flush()

191

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

192

'--passphrase-file',

193

passfile.name]

194

+ self.gnupgargs,

195

stdin = subprocess.PIPE,

196

stdout = subprocess.PIPE,

197

stderr = subprocess.PIPE)

198

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

199

if proc.returncode != 0:

200

raise PGPError(err)

177

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

178

with open(os.devnull) as devnull:

179

try:

180

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

181

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

182

attach_fhs={'stderr': devnull})

183

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

184

f.write(data)

185

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

186

ciphertext = f.read()

187

proc.wait()

188

except IOError as e:

189

raise PGPError(e)

190

self.gnupg.passphrase = None

201

191

return ciphertext

202

192

203

193

def decrypt(self, data, password):

204

passphrase = self.password_encode(password)

205

with tempfile.NamedTemporaryFile(dir = self.tempdir

206

) as passfile:

207

passfile.write(passphrase)

208

passfile.flush()

209

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

210

'--passphrase-file',

211

passfile.name]

212

+ self.gnupgargs,

213

stdin = subprocess.PIPE,

214

stdout = subprocess.PIPE,

215

stderr = subprocess.PIPE)

216

decrypted_plaintext, err = proc.communicate(input

217

= data)

218

if proc.returncode != 0:

219

raise PGPError(err)

194

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

195

with open(os.devnull) as devnull:

196

try:

197

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

198

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

199

attach_fhs={'stderr': devnull})

200

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

201

f.write(data)

202

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

203

decrypted_plaintext = f.read()

204

proc.wait()

205

except IOError as e:

206

raise PGPError(e)

207

self.gnupg.passphrase = None

220

208

return decrypted_plaintext

221

209

222

210

211

223

212

class AvahiError(Exception):

224

213

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

225

214

self.value = value

242

231

Used to optionally bind to the specified interface.

243

232

name: string; Example: 'Mandos'

244

233

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

245

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

234

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

246

235

port: integer; what port to announce

247

236

TXT: list of strings; TXT record for the service

248

237

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

254

243

server: D-Bus Server

255

244

bus: dbus.SystemBus()

256

245

"""

257

258

246

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

259

247

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

260

248

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

273

261

self.server = None

274

262

self.bus = bus

275

263

self.entry_group_state_changed_match = None

276

277

264

def rename(self):

278

265

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

279

266

if self.rename_count >= self.max_renames:

289

276

try:

290

277

self.add()

291

278

except dbus.exceptions.DBusException as error:

292

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

279

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

293

280

self.cleanup()

294

281

os._exit(1)

295

282

self.rename_count += 1

296

297

283

def remove(self):

298

284

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

299

285

if self.entry_group_state_changed_match is not None:

301

287

self.entry_group_state_changed_match = None

302

288

if self.group is not None:

303

289

self.group.Reset()

304

305

290

def add(self):

306

291

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

307

292

self.remove()

324

309

dbus.UInt16(self.port),

325

310

avahi.string_array_to_txt_array(self.TXT))

326

311

self.group.Commit()

327

328

312

def entry_group_state_changed(self, state, error):

329

313

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

330

314

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

337

321

elif state == avahi.ENTRY_GROUP_FAILURE:

338

322

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

339

323

unicode(error))

340

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

341

.format(error))

342

324

raise AvahiGroupError("State changed: %s"

325

% unicode(error))

343

326

def cleanup(self):

344

327

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

345

328

if self.group is not None:

350

333

pass

351

334

self.group = None

352

335

self.remove()

353

354

336

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

355

337

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

356

338

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

375

357

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

376

358

else:

377

359

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

378

379

360

def activate(self):

380

361

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

381

362

if self.server is None:

388

369

self.server_state_changed)

389

370

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

390

371

391

392

372

class AvahiServiceToSyslog(AvahiService):

393

373

def rename(self):

394

374

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

395

375

ret = AvahiService.rename(self)

396

376

syslogger.setFormatter(logging.Formatter

397

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

398

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

399

.format(self.name)))

377

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

378

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

379

% self.name))

400

380

return ret

401

381

402

403

382

def timedelta_to_milliseconds(td):

404

383

"Convert a datetime.timedelta() to milliseconds"

405

384

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

406

385

+ (td.seconds * 1000)

407

386

+ (td.microseconds // 1000))

408

409

387

410

388

class Client(object):

411

389

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

412

390

437

415

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

438

416

last_checker_status: integer between 0 and 255 reflecting exit

439

417

status of last checker. -1 reflects crashed

440

checker, -2 means no checker completed yet.

418

checker, or None.

441

419

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

442

420

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

443

421

D-Bus identifiers

444

422

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

445

423

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

446

424

until this client is disabled

447

extended_timeout: extra long timeout when secret has been sent

425

extended_timeout: extra long timeout when password has been sent

448

426

runtime_expansions: Allowed attributes for runtime expansion.

449

427

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

450

428

disabled, or None

451

server_settings: The server_settings dict from main()

452

429

"""

453

430

454

431

runtime_expansions = ("approval_delay", "approval_duration",

455

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

456

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

457

"last_approval_request", "last_checked_ok",

432

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

433

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

458

434

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

459

client_defaults = { "timeout": "PT5M",

460

"extended_timeout": "PT15M",

461

"interval": "PT2M",

435

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

436

"extended_timeout": "15m",

437

"interval": "2m",

462

438

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

463

439

"host": "",

464

"approval_delay": "PT0S",

465

"approval_duration": "PT1S",

440

"approval_delay": "0s",

441

"approval_duration": "1s",

466

442

"approved_by_default": "True",

467

443

"enabled": "True",

468

444

}

481

457

482

458

def approval_delay_milliseconds(self):

483

459

return timedelta_to_milliseconds(self.approval_delay)

484

460

485

461

@staticmethod

486

462

def config_parser(config):

487

463

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

512

488

"rb") as secfile:

513

489

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

514

490

else:

515

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

516

.format(section))

491

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

492

% section)

517

493

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

518

494

client["extended_timeout"] = string_to_delta(

519

495

section["extended_timeout"])

525

501

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

526

502

client["last_approval_request"] = None

527

503

client["last_checked_ok"] = None

528

client["last_checker_status"] = -2

504

client["last_checker_status"] = None

529

505

530

506

return settings

531

532

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

507

508

509

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

510

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

511

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

512

attribute."""

533

513

self.name = name

534

if server_settings is None:

535

server_settings = {}

536

self.server_settings = server_settings

537

514

# adding all client settings

538

515

for setting, value in settings.iteritems():

539

516

setattr(self, setting, value)

547

524

else:

548

525

self.last_enabled = None

549

526

self.expires = None

550

527

551

528

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

552

529

# Uppercase and remove spaces from fingerprint for later

553

530

# comparison purposes with return value from the fingerprint()

555

532

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

556

533

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

557

534

datetime.datetime.utcnow())

558

535

559

536

# attributes specific for this server instance

560

537

self.checker = None

561

538

self.checker_initiator_tag = None

589

566

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

590

567

# Already enabled

591

568

return

569

self.send_changedstate()

592

570

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

593

571

self.enabled = True

594

572

self.last_enabled = datetime.datetime.utcnow()

595

573

self.init_checker()

596

self.send_changedstate()

597

574

598

575

def disable(self, quiet=True):

599

576

"""Disable this client."""

600

577

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

601

578

return False

602

579

if not quiet:

580

self.send_changedstate()

581

if not quiet:

603

582

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

604

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

583

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

605

584

gobject.source_remove(self.disable_initiator_tag)

606

585

self.disable_initiator_tag = None

607

586

self.expires = None

608

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

587

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

609

588

gobject.source_remove(self.checker_initiator_tag)

610

589

self.checker_initiator_tag = None

611

590

self.stop_checker()

612

591

self.enabled = False

613

if not quiet:

614

self.send_changedstate()

615

592

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

616

593

return False

617

594

621

598

def init_checker(self):

622

599

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

623

600

# and every interval from then on.

624

if self.checker_initiator_tag is not None:

625

gobject.source_remove(self.checker_initiator_tag)

626

601

self.checker_initiator_tag = (gobject.timeout_add

627

602

(self.interval_milliseconds(),

628

603

self.start_checker))

629

604

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

630

if self.disable_initiator_tag is not None:

631

gobject.source_remove(self.disable_initiator_tag)

632

605

self.disable_initiator_tag = (gobject.timeout_add

633

606

(self.timeout_milliseconds(),

634

607

self.disable))

653

626

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

654

627

vars(self))

655

628

656

def checked_ok(self):

657

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

658

self.last_checked_ok = datetime.datetime.utcnow()

659

self.last_checker_status = 0

660

self.bump_timeout()

661

662

def bump_timeout(self, timeout=None):

663

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

629

def checked_ok(self, timeout=None):

630

"""Bump up the timeout for this client.

631

632

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

633

alive and well.

634

"""

664

635

if timeout is None:

665

636

timeout = self.timeout

637

self.last_checked_ok = datetime.datetime.utcnow()

666

638

if self.disable_initiator_tag is not None:

667

639

gobject.source_remove(self.disable_initiator_tag)

668

self.disable_initiator_tag = None

669

640

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

670

641

self.disable_initiator_tag = (gobject.timeout_add

671

642

(timedelta_to_milliseconds

681

652

If a checker already exists, leave it running and do

682

653

nothing."""

683

654

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

684

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

685

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

686

# would inevitably timeout, since no checker would get a

687

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

655

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

656

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

657

# client would inevitably timeout, since no checker would get

658

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

688

659

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

689

660

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

690

661

# should be.

692

663

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

693

664

try:

694

665

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

695

except AttributeError:

696

pass

697

except OSError as error:

698

if error.errno != errno.ECHILD:

699

raise

666

except (AttributeError, OSError) as error:

667

if (isinstance(error, OSError)

668

and error.errno != errno.ECHILD):

669

raise error

700

670

else:

701

671

if pid:

702

672

logger.warning("Checker was a zombie")

705

675

self.current_checker_command)

706

676

# Start a new checker if needed

707

677

if self.checker is None:

708

# Escape attributes for the shell

709

escaped_attrs = dict(

710

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

711

for attr in

712

self.runtime_expansions)

713

678

try:

714

command = self.checker_command % escaped_attrs

715

except TypeError as error:

716

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

717

self.checker_command, exc_info=error)

718

return True # Try again later

679

# In case checker_command has exactly one % operator

680

command = self.checker_command % self.host

681

except TypeError:

682

# Escape attributes for the shell

683

escaped_attrs = dict(

684

(attr,

685

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

686

errors=

687

'replace')))

688

for attr in

689

self.runtime_expansions)

690

691

try:

692

command = self.checker_command % escaped_attrs

693

except TypeError as error:

694

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

695

' %s', self.checker_command, error)

696

return True # Try again later

719

697

self.current_checker_command = command

720

698

try:

721

699

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

724

702

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

725

703

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

726

704

# always replaced by /dev/null.)

727

# The exception is when not debugging but nevertheless

728

# running in the foreground; use the previously

729

# created wnull.

730

popen_args = {}

731

if (not self.server_settings["debug"]

732

and self.server_settings["foreground"]):

733

popen_args.update({"stdout": wnull,

734

"stderr": wnull })

735

705

self.checker = subprocess.Popen(command,

736

706

close_fds=True,

737

shell=True, cwd="/",

738

**popen_args)

739

except OSError as error:

740

logger.error("Failed to start subprocess",

741

exc_info=error)

742

return True

743

self.checker_callback_tag = (gobject.child_watch_add

744

(self.checker.pid,

745

self.checker_callback,

746

data=command))

747

# The checker may have completed before the gobject

748

# watch was added. Check for this.

749

try:

707

shell=True, cwd="/")

708

self.checker_callback_tag = (gobject.child_watch_add

709

(self.checker.pid,

710

self.checker_callback,

711

data=command))

712

# The checker may have completed before the gobject

713

# watch was added. Check for this.

750

714

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

715

if pid:

716

gobject.source_remove(self.checker_callback_tag)

717

self.checker_callback(pid, status, command)

751

718

except OSError as error:

752

if error.errno == errno.ECHILD:

753

# This should never happen

754

logger.error("Child process vanished",

755

exc_info=error)

756

return True

757

raise

758

if pid:

759

gobject.source_remove(self.checker_callback_tag)

760

self.checker_callback(pid, status, command)

719

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

720

error)

761

721

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

762

722

return True

763

723

770

730

return

771

731

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

772

732

try:

773

self.checker.terminate()

733

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

774

734

#time.sleep(0.5)

775

735

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

776

# self.checker.kill()

736

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

777

737

except OSError as error:

778

738

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

779

739

raise

796

756

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

797

757

if byte_arrays and signature != "ay":

798

758

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

799

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

759

" signature %r" % signature)

800

760

def decorator(func):

801

761

func._dbus_is_property = True

802

762

func._dbus_interface = dbus_interface

810

770

return decorator

811

771

812

772

813

def dbus_interface_annotations(dbus_interface):

814

"""Decorator for marking functions returning interface annotations

815

816

Usage:

817

818

@dbus_interface_annotations("org.example.Interface")

819

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

820

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

821

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

822

"false"}

823

"""

824

def decorator(func):

825

func._dbus_is_interface = True

826

func._dbus_interface = dbus_interface

827

func._dbus_name = dbus_interface

828

return func

829

return decorator

830

831

832

def dbus_annotations(annotations):

833

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

834

Usage:

835

836

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

837

access="r")

838

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

839

"org.freedesktop.DBus.Property."

840

"EmitsChangedSignal": "false"})

841

def Property_dbus_property(self):

842

return dbus.Boolean(False)

843

"""

844

def decorator(func):

845

func._dbus_annotations = annotations

846

return func

847

return decorator

848

849

850

773

class DBusPropertyException(dbus.exceptions.DBusException):

851

774

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

852

775

"""

875

798

"""

876

799

877

800

@staticmethod

878

def _is_dbus_thing(thing):

879

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

880

881

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

882

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

883

"""

884

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

885

False)

801

def _is_dbus_property(obj):

802

return getattr(obj, "_dbus_is_property", False)

886

803

887

def _get_all_dbus_things(self, thing):

804

def _get_all_dbus_properties(self):

888

805

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

889

806

"""

890

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

891

name),

892

athing.__get__(self))

807

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

893

808

for cls in self.__class__.__mro__

894

for name, athing in

895

inspect.getmembers(cls,

896

self._is_dbus_thing(thing)))

809

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

897

811

898

812

def _get_dbus_property(self, interface_name, property_name):

899

813

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

901

815

"""

902

816

for cls in self.__class__.__mro__:

903

817

for name, value in (inspect.getmembers

904

(cls,

905

self._is_dbus_thing("property"))):

818

(cls, self._is_dbus_property)):

906

819

if (value._dbus_name == property_name

907

820

and value._dbus_interface == interface_name):

908

821

return value.__get__(self)

936

849

# The byte_arrays option is not supported yet on

937

850

# signatures other than "ay".

938

851

if prop._dbus_signature != "ay":

939

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

940

"'ay' signature {0!r}"

941

.format(prop._dbus_signature))

942

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

943

for byte in value))

852

raise ValueError

853

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

854

for byte in value))

944

855

prop(value)

945

856

946

857

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

952

863

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

953

864

"""

954

865

properties = {}

955

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

866

for name, prop in self._get_all_dbus_properties():

956

867

if (interface_name

957

868

and interface_name != prop._dbus_interface):

958

869

# Interface non-empty but did not match

973

884

path_keyword='object_path',

974

885

connection_keyword='connection')

975

886

def Introspect(self, object_path, connection):

976

"""Overloading of standard D-Bus method.

977

978

Inserts property tags and interface annotation tags.

887

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

979

888

"""

980

889

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

981

890

connection)

988

897

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

989

898

return e

990

899

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

991

# Add property tags

992

900

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

993

901

for name, prop

994

in self._get_all_dbus_things("property")

902

in self._get_all_dbus_properties()

995

903

if prop._dbus_interface

996

904

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

997

905

if_tag.appendChild(tag)

998

# Add annotation tags

999

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

1000

for tag in if_tag.getElementsByTagName(typ):

1001

annots = dict()

1002

for name, prop in (self.

1003

_get_all_dbus_things(typ)):

1004

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

1005

and prop._dbus_interface

1006

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

1007

annots.update(getattr

1008

(prop,

1009

"_dbus_annotations",

1010

{}))

1011

for name, value in annots.iteritems():

1012

ann_tag = document.createElement(

1013

"annotation")

1014

ann_tag.setAttribute("name", name)

1015

ann_tag.setAttribute("value", value)

1016

tag.appendChild(ann_tag)

1017

# Add interface annotation tags

1018

for annotation, value in dict(

1019

itertools.chain.from_iterable(

1020

annotations().iteritems()

1021

for name, annotations in

1022

self._get_all_dbus_things("interface")

1023

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

1024

)).iteritems():

1025

ann_tag = document.createElement("annotation")

1026

ann_tag.setAttribute("name", annotation)

1027

ann_tag.setAttribute("value", value)

1028

if_tag.appendChild(ann_tag)

1029

906

# Add the names to the return values for the

1030

907

# "org.freedesktop.DBus.Properties" methods

1031

908

if (if_tag.getAttribute("name")

1046

923

except (AttributeError, xml.dom.DOMException,

1047

924

xml.parsers.expat.ExpatError) as error:

1048

925

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

1049

exc_info=error)

926

error)

1050

927

return xmlstring

1051

928

1052

929

1053

def datetime_to_dbus(dt, variant_level=0):

930

def datetime_to_dbus (dt, variant_level=0):

1054

931

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

1055

932

if dt is None:

1056

933

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

1058

935

variant_level=variant_level)

1059

936

1060

937

1061

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1062

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

1063

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

1064

interface names according to the "alt_interface_names" mapping.

1065

Usage:

1066

1067

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

1068

"net.example.AlternateInterface"})

1069

class SampleDBusObject(dbus.service.Object):

1070

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

1071

def SampleDBusMethod():

1072

pass

1073

1074

The above "SampleDBusMethod" on "SampleDBusObject" will be

1075

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

1076

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

1077

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

1078

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

1079

1080

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

1081

(from DBusObjectWithProperties) and interfaces (from the

1082

dbus_interface_annotations decorator).

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

939

.__metaclass__):

940

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

941

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

1083

942

"""

1084

def wrapper(cls):

1085

for orig_interface_name, alt_interface_name in (

1086

alt_interface_names.iteritems()):

1087

attr = {}

1088

interface_names = set()

1089

# Go though all attributes of the class

1090

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

943

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

944

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

945

# methods, signals, or properties in them

946

for base in (b for b in bases

947

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

948

# Go though all attributes of the base class

949

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

1091

950

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

1092

951

# with the wrong interface name

1093

952

if (not hasattr(attribute, "_dbus_interface")

1094

953

or not attribute._dbus_interface

1095

.startswith(orig_interface_name)):

954

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

1096

955

continue

1097

956

# Create an alternate D-Bus interface name based on

1098

957

# the current name

1099

958

alt_interface = (attribute._dbus_interface

1100

.replace(orig_interface_name,

1101

alt_interface_name))

1102

interface_names.add(alt_interface)

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

1103

961

# Is this a D-Bus signal?

1104

962

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

1105

# Extract the original non-method undecorated

1106

# function by black magic

963

# Extract the original non-method function by

964

# black magic

1107

965

nonmethod_func = (dict(

1108

966

zip(attribute.func_code.co_freevars,

1109

967

attribute.__closure__))["func"]

1120

978

nonmethod_func.func_name,

1121

979

nonmethod_func.func_defaults,

1122

980

nonmethod_func.func_closure)))

1123

# Copy annotations, if any

1124

try:

1125

new_function._dbus_annotations = (

1126

dict(attribute._dbus_annotations))

1127

except AttributeError:

1128

pass

1129

981

# Define a creator of a function to call both the

1130

# original and alternate functions, so both the

1131

# original and alternate signals gets sent when

1132

# the function is called

982

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

983

# signals gets sent when the function is called

1133

984

def fixscope(func1, func2):

1134

985

"""This function is a scope container to pass

1135

986

func1 and func2 to the "call_both" function

1142

993

return call_both

1143

994

# Create the "call_both" function and add it to

1144

995

# the class

1145

attr[attrname] = fixscope(attribute, new_function)

996

attr[attrname] = fixscope(attribute,

997

new_function)

1146

998

# Is this a D-Bus method?

1147

999

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

1148

1000

# Create a new, but exactly alike, function

1159

1011

attribute.func_name,

1160

1012

attribute.func_defaults,

1161

1013

attribute.func_closure)))

1162

# Copy annotations, if any

1163

try:

1164

attr[attrname]._dbus_annotations = (

1165

dict(attribute._dbus_annotations))

1166

except AttributeError:

1167

pass

1168

1014

# Is this a D-Bus property?

1169

1015

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

1170

1016

# Create a new, but exactly alike, function

1184

1030

attribute.func_name,

1185

1031

attribute.func_defaults,

1186

1032

attribute.func_closure)))

1187

# Copy annotations, if any

1188

try:

1189

attr[attrname]._dbus_annotations = (

1190

dict(attribute._dbus_annotations))

1191

except AttributeError:

1192

pass

1193

# Is this a D-Bus interface?

1194

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

1195

# Create a new, but exactly alike, function

1196

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

1197

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

1198

# to the class.

1199

attr[attrname] = (dbus_interface_annotations

1200

(alt_interface)

1201

(types.FunctionType

1202

(attribute.func_code,

1203

attribute.func_globals,

1204

attribute.func_name,

1205

attribute.func_defaults,

1206

attribute.func_closure)))

1207

if deprecate:

1208

# Deprecate all alternate interfaces

1209

iname="_AlternateDBusNames_interface_annotation{0}"

1210

for interface_name in interface_names:

1211

@dbus_interface_annotations(interface_name)

1212

def func(self):

1213

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

1214

"true" }

1215

# Find an unused name

1216

for aname in (iname.format(i)

1217

for i in itertools.count()):

1218

if aname not in attr:

1219

attr[aname] = func

1220

break

1221

if interface_names:

1222

# Replace the class with a new subclass of it with

1223

# methods, signals, etc. as created above.

1224

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

1225

(cls,), attr)

1226

return cls

1227

return wrapper

1228

1229

1230

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

1231

"se.bsnet.fukt.Mandos"})

1033

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

1034

1035

1232

1036

class ClientDBus(Client, DBusObjectWithProperties):

1233

1037

"""A Client class using D-Bus

1234

1038

1245

1049

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

1246

1050

self.bus = bus

1247

1051

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

1248

1055

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

1249

1056

# the D-Bus

1250

1057

client_object_name = unicode(self.name).translate(

1254

1061

("/clients/" + client_object_name))

1255

1062

DBusObjectWithProperties.__init__(self, self.bus,

1256

1063

self.dbus_object_path)

1257

1064

1258

1065

def notifychangeproperty(transform_func,

1259

1066

dbus_name, type_func=lambda x: x,

1260

1067

variant_level=1):

1283

1090

1284

1091

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

1285

1092

1093

1286

1094

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1287

1095

approvals_pending = notifychangeproperty(dbus.Boolean,

1288

1096

"ApprovalPending",

1295

1103

checker is not None)

1296

1104

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1297

1105

"LastCheckedOK")

1298

last_checker_status = notifychangeproperty(dbus.Int16,

1299

"LastCheckerStatus")

1300

1106

last_approval_request = notifychangeproperty(

1301

1107

datetime_to_dbus, "LastApprovalRequest")

1302

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

1352

1158

*args, **kwargs)

1353

1159

1354

1160

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

1355

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

1161

old_checker = self.checker

1162

if self.checker is not None:

1163

old_checker_pid = self.checker.pid

1164

else:

1165

old_checker_pid = None

1356

1166

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

1357

1167

# Only if new checker process was started

1358

1168

if (self.checker is not None

1366

1176

return False

1367

1177

1368

1178

def approve(self, value=True):

1179

self.send_changedstate()

1369

1180

self.approved = value

1370

1181

gobject.timeout_add(timedelta_to_milliseconds

1371

1182

(self.approval_duration),

1372

1183

self._reset_approved)

1373

self.send_changedstate()

1184

1374

1185

1375

1186

## D-Bus methods, signals & properties

1376

1187

_interface = "se.recompile.Mandos.Client"

1377

1188

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1385

1189

## Signals

1386

1190

1387

1191

# CheckerCompleted - signal

1423

1227

"D-Bus signal"

1424

1228

return self.need_approval()

1425

1229

1230

# NeRwequest - signal

1231

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

1232

def NewRequest(self, ip):

1233

"""D-Bus signal

1234

Is sent after a client request a password.

1235

"""

1236

pass

1237

1426

1238

## Methods

1427

1239

1428

1240

# Approve - method

1538

1350

return

1539

1351

return datetime_to_dbus(self.last_checked_ok)

1540

1352

1541

# LastCheckerStatus - property

1542

@dbus_service_property(_interface, signature="n",

1543

access="read")

1544

def LastCheckerStatus_dbus_property(self):

1545

return dbus.Int16(self.last_checker_status)

1546

1547

1353

# Expires - property

1548

1354

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

1549

1355

def Expires_dbus_property(self):

1560

1366

def Timeout_dbus_property(self, value=None):

1561

1367

if value is None: # get

1562

1368

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1564

1369

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

1565

# Reschedule disabling

1370

# Reschedule timeout

1566

1371

if self.enabled:

1567

1372

now = datetime.datetime.utcnow()

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1373

time_to_die = timedelta_to_milliseconds(

1374

(self.last_checked_ok + self.timeout) - now)

1375

if time_to_die <= 0:

1570

1376

# The timeout has passed

1571

1377

self.disable()

1572

1378

else:

1379

self.expires = (now +

1380

datetime.timedelta(milliseconds =

1381

time_to_die))

1573

1382

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

1574

1383

is None):

1575

1384

return

1576

1385

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))

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die,

1388

self.disable))

1581

1389

1582

1390

# ExtendedTimeout - property

1583

1391

@dbus_service_property(_interface, signature="t",

1662

1470

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

1663

1471

1664

1472

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1665

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1666

1478

"""A class to handle client connections.

1667

1479

1703

1515

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

1704

1516

try:

1705

1517

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

1706

raise RuntimeError(line)

1518

raise RuntimeError

1707

1519

except (ValueError, IndexError, RuntimeError) as error:

1708

1520

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

1709

1521

return

1735

1547

except KeyError:

1736

1548

return

1737

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1738

1554

if client.approval_delay:

1739

1555

delay = client.approval_delay

1740

1556

client.approvals_pending += 1

1771

1587

#wait until timeout or approved

1772

1588

time = datetime.datetime.now()

1773

1589

client.changedstate.acquire()

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1777

1593

client.changedstate.release()

1778

1594

time2 = datetime.datetime.now()

1779

1595

if (time2 - time) >= delay:

1795

1611

try:

1796

1612

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

1797

1613

except gnutls.errors.GNUTLSError as error:

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1614

logger.warning("gnutls send failed")

1800

1615

return

1801

1616

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

1802

1617

sent, len(client.secret)

1805

1620

1806

1621

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

1807

1622

# bump the timeout using extended_timeout

1808

client.bump_timeout(client.extended_timeout)

1623

client.checked_ok(client.extended_timeout)

1809

1624

if self.server.use_dbus:

1810

1625

# Emit D-Bus signal

1811

1626

client.GotSecret()

1816

1631

try:

1817

1632

session.bye()

1818

1633

except gnutls.errors.GNUTLSError as error:

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1634

logger.warning("GnuTLS bye failed")

1821

1635

1822

1636

@staticmethod

1823

1637

def peer_certificate(session):

1895

1709

def process_request(self, request, address):

1896

1710

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

1897

1711

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

1898

args = (request, address))

1712

args = (request,

1713

address))

1899

1714

proc.start()

1900

1715

return proc

1901

1716

1916

1731

1917

1732

def add_pipe(self, parent_pipe, proc):

1918

1733

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

1919

raise NotImplementedError()

1734

raise NotImplementedError

1920

1735

1921

1736

1922

1737

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1929

1744

use_ipv6: Boolean; to use IPv6 or not

1930

1745

"""

1931

1746

def __init__(self, server_address, RequestHandlerClass,

1932

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

1933

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

1934

creating a new one with socket.socket().

1935

"""

1747

interface=None, use_ipv6=True):

1936

1748

self.interface = interface

1937

1749

if use_ipv6:

1938

1750

self.address_family = socket.AF_INET6

1939

if socketfd is not None:

1940

# Save the file descriptor

1941

self.socketfd = socketfd

1942

# Save the original socket.socket() function

1943

self.socket_socket = socket.socket

1944

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

1945

#

1946

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

1947

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

1948

# patching socket.socket.)

1949

#

1950

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

1951

@functools.wraps(socket.socket)

1952

def socket_wrapper(*args, **kwargs):

1953

# Restore original function so subsequent calls are

1954

# not affected.

1955

socket.socket = self.socket_socket

1956

del self.socket_socket

1957

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

1958

# saved file descriptor.

1959

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

1960

# Replace socket.socket() function with wrapper

1961

socket.socket = socket_wrapper

1962

# The socketserver.TCPServer.__init__ will call

1963

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

1964

# socket_wrapper(), if socketfd was set.

1965

1751

socketserver.TCPServer.__init__(self, server_address,

1966

1752

RequestHandlerClass)

1967

1968

1753

def server_bind(self):

1969

1754

"""This overrides the normal server_bind() function

1970

1755

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

1978

1763

try:

1979

1764

self.socket.setsockopt(socket.SOL_SOCKET,

1980

1765

SO_BINDTODEVICE,

1981

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

1766

str(self.interface

1767

+ '\0'))

1982

1768

except socket.error as error:

1983

if error.errno == errno.EPERM:

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1986

elif error.errno == errno.ENOPROTOOPT:

1769

if error[0] == errno.EPERM:

1770

logger.error("No permission to"

1771

" bind to interface %s",

1772

self.interface)

1773

elif error[0] == errno.ENOPROTOOPT:

1987

1774

logger.error("SO_BINDTODEVICE not available;"

1988

1775

" cannot bind to interface %s",

1989

1776

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1993

1777

else:

1994

1778

raise

1995

1779

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

1998

1782

if self.address_family == socket.AF_INET6:

1999

1783

any_address = "::" # in6addr_any

2000

1784

else:

2001

any_address = "0.0.0.0" # INADDR_ANY

1785

any_address = socket.INADDR_ANY

2002

1786

self.server_address = (any_address,

2003

1787

self.server_address[1])

2004

1788

elif not self.server_address[1]:

2025

1809

"""

2026

1810

def __init__(self, server_address, RequestHandlerClass,

2027

1811

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

2028

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

1812

gnutls_priority=None, use_dbus=True):

2029

1813

self.enabled = False

2030

1814

self.clients = clients

2031

1815

if self.clients is None:

2035

1819

IPv6_TCPServer.__init__(self, server_address,

2036

1820

RequestHandlerClass,

2037

1821

interface = interface,

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1822

use_ipv6 = use_ipv6)

2040

1823

def server_activate(self):

2041

1824

if self.enabled:

2042

1825

return socketserver.TCPServer.server_activate(self)

2055

1838

2056

1839

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

2057

1840

proc = None, client_object=None):

1841

condition_names = {

1842

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

1843

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

1844

# blocking).

1845

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

1846

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

1847

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

1848

# broken, usually for pipes and

1849

# sockets).

1850

}

1851

conditions_string = ' | '.join(name

1852

for cond, name in

1853

condition_names.iteritems()

1854

if cond & condition)

2058

1855

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

2059

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

1856

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

2060

1857

# Wait for other process to exit

2061

1858

proc.join()

2062

1859

return False

2120

1917

return True

2121

1918

2122

1919

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

2222

1920

def string_to_delta(interval):

2223

1921

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

2224

1922

2235

1933

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

2236

1934

datetime.timedelta(0, 330)

2237

1935

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2244

1936

timevalue = datetime.timedelta(0)

2245

1937

for s in interval.split():

2246

1938

try:

2257

1949

elif suffix == "w":

2258

1950

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

2259

1951

else:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1952

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

1953

except (ValueError, IndexError) as e:

2263

1954

raise ValueError(*(e.args))

2264

1955

timevalue += delta

2265

1956

return timevalue

2278

1969

sys.exit()

2279

1970

if not noclose:

2280

1971

# Close all standard open file descriptors

2281

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

1972

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

2282

1973

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

2283

1974

raise OSError(errno.ENODEV,

2284

"{0} not a character device"

2285

.format(os.devnull))

1975

"%s not a character device"

1976

% os.path.devnull)

2286

1977

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

2287

1978

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

2288

1979

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

2297

1988

2298

1989

parser = argparse.ArgumentParser()

2299

1990

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

2300

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

1991

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

2301

1992

help="show version number and exit")

2302

1993

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

2303

1994

help="Bind to interface IF")

2309

2000

help="Run self-test")

2310

2001

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

2311

2002

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

2312

" to terminal", default=None)

2003

" to terminal")

2313

2004

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

2314

2005

help="Debug level for stdout output")

2315

2006

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

2322

2013

" files")

2323

2014

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

2324

2015

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

2325

" system bus interface", default=None)

2016

" system bus interface")

2326

2017

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

2327

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

2328

default=None)

2018

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

2329

2019

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

2330

2020

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")

2021

" state")

2335

2022

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

2336

2023

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

2337

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

2338

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

2339

2024

2340

2025

options = parser.parse_args()

2341

2026

2342

2027

if options.check:

2343

2028

import doctest

2344

fail_count, test_count = doctest.testmod()

2345

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

2029

doctest.testmod()

2030

sys.exit()

2346

2031

2347

2032

# Default values for config file for server-global settings

2348

2033

server_defaults = { "interface": "",

2350

2035

"port": "",

2351

2036

"debug": "False",

2352

2037

"priority":

2353

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

2038

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

2354

2039

"servicename": "Mandos",

2355

2040

"use_dbus": "True",

2356

2041

"use_ipv6": "True",

2357

2042

"debuglevel": "",

2358

2043

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

2044

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

2362

2045

}

2363

2046

2364

2047

# Parse config file for server-global settings

2369

2052

# Convert the SafeConfigParser object to a dict

2370

2053

server_settings = server_config.defaults()

2371

2054

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

2372

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

2055

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

2373

2056

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

2374

2057

option)

2375

2058

if server_settings["port"]:

2376

2059

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

2377

2060

"port")

2378

if server_settings["socket"]:

2379

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

2380

"socket")

2381

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

2382

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

2383

# happen with a supplied network socket.

2384

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

2385

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

2386

["socket"])

2387

2061

del server_config

2388

2062

2389

2063

# Override the settings from the config file with command line

2391

2065

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

2392

2066

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

2393

2067

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

2394

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

2068

"statedir"):

2395

2069

value = getattr(options, option)

2396

2070

if value is not None:

2397

2071

server_settings[option] = value

2400

2074

for option in server_settings.keys():

2401

2075

if type(server_settings[option]) is str:

2402

2076

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

2403

# Force all boolean options to be boolean

2404

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

2405

"foreground"):

2406

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

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

2410

2077

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

2411

2078

2412

2079

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

2418

2085

use_ipv6 = server_settings["use_ipv6"]

2419

2086

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

2420

2087

stored_state_file)

2421

foreground = server_settings["foreground"]

2422

2088

2423

2089

if debug:

2424

2090

initlogger(debug, logging.DEBUG)

2431

2097

2432

2098

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

2433

2099

syslogger.setFormatter(logging.Formatter

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

2100

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

2101

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

2102

% server_settings["servicename"]))

2438

2103

2439

2104

# Parse config file with clients

2440

2105

client_config = configparser.SafeConfigParser(Client

2453

2118

use_ipv6=use_ipv6,

2454

2119

gnutls_priority=

2455

2120

server_settings["priority"],

2456

use_dbus=use_dbus,

2457

socketfd=(server_settings["socket"]

2458

or None))

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

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

2462

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

2463

pidfile = None

2121

use_dbus=use_dbus)

2122

if not debug:

2123

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

2464

2124

try:

2465

2125

pidfile = open(pidfilename, "w")

2466

except IOError as e:

2467

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

2468

exc_info=e)

2126

except IOError:

2127

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

2469

2128

2470

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

2129

try:

2130

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

2131

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

2132

except KeyError:

2471

2133

try:

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

2134

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

2135

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

2475

2136

except KeyError:

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

2137

try:

2138

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

2139

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

2140

except KeyError:

2141

uid = 65534

2142

gid = 65534

2480

2143

try:

2481

2144

os.setgid(gid)

2482

2145

os.setuid(uid)

2483

2146

except OSError as error:

2484

if error.errno != errno.EPERM:

2485

raise

2147

if error[0] != errno.EPERM:

2148

raise error

2486

2149

2487

2150

if debug:

2488

2151

# Enable all possible GnuTLS debugging

2499

2162

.gnutls_global_set_log_function(debug_gnutls))

2500

2163

2501

2164

# Redirect stdin so all checkers get /dev/null

2502

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

2165

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

2503

2166

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

2504

2167

if null > 2:

2505

2168

os.close(null)

2506

2169

2507

2170

# Need to fork before connecting to D-Bus

2508

if not foreground:

2171

if not debug:

2509

2172

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

2510

2173

daemon()

2511

2174

2512

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

2513

# need to inform gobject that threads will be used.

2514

2175

gobject.threads_init()

2515

2176

2516

2177

global main_loop

2517

2178

# From the Avahi example code

2518

DBusGMainLoop(set_as_default=True)

2179

DBusGMainLoop(set_as_default=True )

2519

2180

main_loop = gobject.MainLoop()

2520

2181

bus = dbus.SystemBus()

2521

2182

# End of Avahi example code

2527

2188

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

2528

2189

do_not_queue=True))

2529

2190

except dbus.exceptions.NameExistsException as e:

2530

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

2191

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

2531

2192

use_dbus = False

2532

2193

server_settings["use_dbus"] = False

2533

2194

tcp_server.use_dbus = False

2545

2206

2546

2207

client_class = Client

2547

2208

if use_dbus:

2548

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

2209

client_class = functools.partial(ClientDBusTransitional,

2210

bus = bus)

2549

2211

2550

2212

client_settings = Client.config_parser(client_config)

2551

2213

old_client_settings = {}

2552

2214

clients_data = {}

2553

2215

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

2216

# Get client data and settings from last running state.

2563

2217

if server_settings["restore"]:

2564

2218

try:

2567

2221

(stored_state))

2568

2222

os.remove(stored_state_path)

2569

2223

except IOError as e:

2570

if e.errno == errno.ENOENT:

2571

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

2572

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

2573

else:

2574

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

2575

exc_info=e)

2224

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

2225

.format(e))

2226

if e.errno != errno.ENOENT:

2576

2227

raise

2577

2228

except EOFError as e:

2578

2229

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

2579

"EOFError:", exc_info=e)

2230

"EOFError: {0}".format(e))

2580

2231

2581

2232

with PGPEngine() as pgp:

2582

2233

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

2234

# Decide which value to use after restoring saved state.

2588

2235

# We have three different values: Old config file,

2589

2236

# new config file, and saved state.

2603

2250

2604

2251

# Clients who has passed its expire date can still be

2605

2252

# 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.

2253

# whose checker failed before we stored its state is

2254

# assumed to have failed all checkers during downtime.

2609

2255

if client["enabled"]:

2610

2256

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

2611

2257

if not client["last_checked_ok"]:

2612

2258

logger.warning(

2613

2259

"disabling client {0} - Client never "

2614

"performed a successful checker"

2615

.format(client_name))

2260

"performed a successfull checker"

2261

.format(client["name"]))

2616

2262

client["enabled"] = False

2617

2263

elif client["last_checker_status"] != 0:

2618

2264

logger.warning(

2619

2265

"disabling client {0} - Client "

2620

2266

"last checker failed with error code {1}"

2621

.format(client_name,

2267

.format(client["name"],

2622

2268

client["last_checker_status"]))

2623

2269

client["enabled"] = False

2624

2270

else:

2627

2273

+ client["timeout"])

2628

2274

logger.debug("Last checker succeeded,"

2629

2275

" keeping {0} enabled"

2630

.format(client_name))

2276

.format(client["name"]))

2631

2277

try:

2632

2278

client["secret"] = (

2633

2279

pgp.decrypt(client["encrypted_secret"],

2639

2285

.format(client_name))

2640

2286

client["secret"] = (

2641

2287

client_settings[client_name]["secret"])

2288

2642

2289

2643

2290

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

2644

2291

for client_name in (set(old_client_settings)

2647

2294

for client_name in (set(client_settings)

2648

2295

- set(old_client_settings)):

2649

2296

clients_data[client_name] = client_settings[client_name]

2650

2651

# Create all client objects

2297

2298

# Create clients all clients

2652

2299

for client_name, client in clients_data.iteritems():

2653

2300

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2301

name = client_name, settings = client)

2656

2302

2657

2303

if not tcp_server.clients:

2658

2304

logger.warning("No clients defined")

2659

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

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

2666

except IOError:

2667

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

2668

pidfilename, pid)

2669

del pidfile

2305

2306

if not debug:

2307

try:

2308

with pidfile:

2309

pid = os.getpid()

2310

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

2311

del pidfile

2312

except IOError:

2313

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

2314

pidfilename, pid)

2315

except NameError:

2316

# "pidfile" was never created

2317

pass

2670

2318

del pidfilename

2319

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

2671

2320

2672

2321

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

2673

2322

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

2674

2323

2675

2324

if use_dbus:

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2325

class MandosDBusService(dbus.service.Object):

2679

2326

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

2680

2327

def __init__(self):

2681

2328

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

2682

2329

_interface = "se.recompile.Mandos"

2683

2330

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2690

2331

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

2691

2332

def ClientAdded(self, objpath):

2692

2333

"D-Bus signal"

2734

2375

2735

2376

del _interface

2736

2377

2737

mandos_dbus_service = MandosDBusService()

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

2738

2381

2739

2382

def cleanup():

2740

2383

"Cleanup function; run on exit"

2741

2384

service.cleanup()

2742

2385

2743

2386

multiprocessing.active_children()

2744

wnull.close()

2745

2387

if not (tcp_server.clients or client_settings):

2746

2388

return

2747

2389

2759

2401

# A list of attributes that can not be pickled

2760

2402

# + secret.

2761

2403

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

2762

"checker", "server_settings"))

2404

"checker"))

2763

2405

for name, typ in (inspect.getmembers

2764

2406

(dbus.service.Object)):

2765

2407

exclude.add(name)

2774

2416

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

2775

2417

2776

2418

try:

2777

with (tempfile.NamedTemporaryFile

2778

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

2779

dir=os.path.dirname(stored_state_path),

2780

delete=False)) as stored_state:

2419

tempfd, tempname = tempfile.mkstemp(suffix=".pickle",

2420

prefix="clients-",

2421

dir=os.path.dirname

2422

(stored_state_path))

2423

with os.fdopen(tempfd, "wb") as stored_state:

2781

2424

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

2782

tempname=stored_state.name

2783

2425

os.rename(tempname, stored_state_path)

2784

2426

except (IOError, OSError) as e:

2427

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

2428

.format(e))

2785

2429

if not debug:

2786

2430

try:

2787

2431

os.remove(tempname)

2788

2432

except NameError:

2789

2433

pass

2790

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

2791

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

2792

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

2793

else:

2794

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

2795

exc_info=e)

2796

raise

2434

if e.errno not in set((errno.ENOENT, errno.EACCES,

2435

errno.EEXIST)):

2436

raise e

2797

2437

2798

2438

# Delete all clients, and settings from config

2799

2439

while tcp_server.clients:

2826

2466

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

2827

2467

if use_ipv6:

2828

2468

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

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2469

" flowinfo %d, scope_id %d"

2470

% tcp_server.socket.getsockname())

2831

2471

else: # IPv4

2832

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

2833

*tcp_server.socket.getsockname())

2472

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

2473

% tcp_server.socket.getsockname())

2834

2474

2835

2475

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

2836

2476

2839

2479

try:

2840

2480

service.activate()

2841

2481

except dbus.exceptions.DBusException as error:

2842

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

2482

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

2843

2483

cleanup()

2844

2484

sys.exit(1)

2845

2485

# End of Avahi example code

2852

2492

logger.debug("Starting main loop")

2853

2493

main_loop.run()

2854

2494

except AvahiError as error:

2855

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

2495

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

2856

2496

cleanup()

2857

2497

sys.exit(1)

2858

2498

except KeyboardInterrupt: