/mandos/trunk : revision 482

28

# along with this program. If not, see

29

# <http://www.gnu.org/licenses/>.

30

#

31

# Contact the authors at <mandos@recompile.se>.

31

# Contact the authors at <mandos@fukt.bsnet.se>.

32

#

33

34

from __future__ import (division, absolute_import, print_function,

62

import functools

63

import cPickle as pickle

64

import multiprocessing

65

import types

66

import binascii

67

import tempfile

68

65

69

66

import dbus

70

67

import dbus.service

75

72

import ctypes.util

76

73

import xml.dom.minidom

77

74

import inspect

78

import GnuPGInterface

79

75

80

76

try:

81

77

SO_BINDTODEVICE = socket.SO_BINDTODEVICE

85

81

except ImportError:

86

82

SO_BINDTODEVICE = None

87

83

88

version = "1.4.1"

89

stored_state_file = "clients.pickle"

90

91

logger = logging.getLogger()

84

85

version = "1.3.0"

86

87

#logger = logging.getLogger('mandos')

88

logger = logging.Logger('mandos')

92

89

syslogger = (logging.handlers.SysLogHandler

93

90

(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

94

91

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

95

96

try:

97

if_nametoindex = (ctypes.cdll.LoadLibrary

98

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

99

.if_nametoindex)

100

except (OSError, AttributeError):

101

def if_nametoindex(interface):

102

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

103

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

104

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

105

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

106

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

107

interface))

108

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

109

ifreq[16:20])[0]

110

return interface_index

111

112

113

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

114

"""init logger and add loglevel"""

115

116

syslogger.setFormatter(logging.Formatter

117

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

118

' %(message)s'))

119

logger.addHandler(syslogger)

120

121

if debug:

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)

128

logger.setLevel(level)

129

130

131

class PGPError(Exception):

132

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

133

pass

134

135

136

class PGPEngine(object):

137

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

138

def __init__(self):

139

self.gnupg = GnuPGInterface.GnuPG()

140

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

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'])

147

148

def __enter__(self):

149

return self

150

151

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

152

self._cleanup()

153

return False

154

155

def __del__(self):

156

self._cleanup()

157

158

def _cleanup(self):

159

if self.tempdir is not None:

160

# Delete contents of tempdir

161

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

162

topdown = False):

163

for filename in files:

164

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

165

for dirname in dirs:

166

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

167

# Remove tempdir

168

os.rmdir(self.tempdir)

169

self.tempdir = None

170

171

def password_encode(self, password):

172

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

173

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

174

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

175

176

def encrypt(self, data, password):

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

191

return ciphertext

192

193

def decrypt(self, data, password):

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

208

return decrypted_plaintext

209

210

92

syslogger.setFormatter(logging.Formatter

93

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

94

' %(message)s'))

95

logger.addHandler(syslogger)

96

97

console = logging.StreamHandler()

98

console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'

99

' %(levelname)s:'

100

' %(message)s'))

101

logger.addHandler(console)

211

102

212

103

class AvahiError(Exception):

213

104

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

268

159

" after %i retries, exiting.",

269

160

self.rename_count)

270

161

raise AvahiServiceError("Too many renames")

271

self.name = unicode(self.server

272

.GetAlternativeServiceName(self.name))

162

self.name = unicode(self.server.GetAlternativeServiceName(self.name))

273

163

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

274

164

self.name)

165

syslogger.setFormatter(logging.Formatter

166

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

167

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

168

% self.name))

275

169

self.remove()

276

170

try:

277

171

self.add()

282

176

self.rename_count += 1

283

177

def remove(self):

284

178

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

179

if self.group is not None:

180

try:

181

self.group.Free()

182

except (dbus.exceptions.UnknownMethodException,

183

dbus.exceptions.DBusException) as e:

184

pass

185

self.group = None

285

186

if self.entry_group_state_changed_match is not None:

286

187

self.entry_group_state_changed_match.remove()

287

188

self.entry_group_state_changed_match = None

288

if self.group is not None:

289

self.group.Reset()

290

189

def add(self):

291

190

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

292

191

self.remove()

293

if self.group is None:

294

self.group = dbus.Interface(

295

self.bus.get_object(avahi.DBUS_NAME,

296

self.server.EntryGroupNew()),

297

avahi.DBUS_INTERFACE_ENTRY_GROUP)

192

self.group = dbus.Interface(

193

self.bus.get_object(avahi.DBUS_NAME,

194

self.server.EntryGroupNew(),

195

follow_name_owner_changes=True),

196

avahi.DBUS_INTERFACE_ENTRY_GROUP)

298

197

self.entry_group_state_changed_match = (

299

198

self.group.connect_to_signal(

300

'StateChanged', self.entry_group_state_changed))

199

'StateChanged', self .entry_group_state_changed))

301

200

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

302

201

self.name, self.type)

303

202

self.group.AddService(

325

224

% unicode(error))

326

225

def cleanup(self):

327

226

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

328

if self.group is not None:

329

try:

330

self.group.Free()

331

except (dbus.exceptions.UnknownMethodException,

332

dbus.exceptions.DBusException):

333

pass

334

self.group = None

335

227

self.remove()

336

228

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

337

229

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

344

236

avahi.SERVER_FAILURE:

345

237

"Zeroconf server failure" }

346

238

if state in bad_states:

347

if bad_states[state] is not None:

348

if error is None:

349

logger.error(bad_states[state])

350

else:

351

logger.error(bad_states[state] + ": %r", error)

352

self.cleanup()

239

if bad_states[state]:

240

logger.error(bad_states[state])

241

self.remove()

353

242

elif state == avahi.SERVER_RUNNING:

354

243

self.add()

355

244

else:

356

if error is None:

357

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

358

else:

359

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

245

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

360

246

def activate(self):

361

247

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

362

248

if self.server is None:

369

255

self.server_state_changed)

370

256

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

371

257

372

class AvahiServiceToSyslog(AvahiService):

373

def rename(self):

374

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

375

ret = AvahiService.rename(self)

376

syslogger.setFormatter(logging.Formatter

377

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

378

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

379

% self.name))

380

return ret

381

258

382

def timedelta_to_milliseconds(td):

383

"Convert a datetime.timedelta() to milliseconds"

384

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

385

+ (td.seconds * 1000)

386

+ (td.microseconds // 1000))

387

388

259

class Client(object):

389

260

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

390

261

391

262

Attributes:

392

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

263

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

393

264

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

394

265

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

395

266

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

402

273

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

403

274

checker_initiator_tag: a gobject event source tag, or None

404

275

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

405

client_structure: Object describing what attributes a client has

406

and is used for storing the client at exit

407

276

current_checker_command: string; current running checker_command

277

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

408

278

disable_initiator_tag: a gobject event source tag, or None

409

279

enabled: bool()

410

280

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

413

283

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

414

284

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

415

285

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

416

last_checker_status: integer between 0 and 255 reflecting exit

417

status of last checker. -1 reflects crashed

418

checker, or None.

419

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

286

last_enabled: datetime.datetime(); (UTC)

420

287

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

421

288

D-Bus identifiers

422

289

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

423

290

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

424

291

until this client is disabled

425

extended_timeout: extra long timeout when password has been sent

426

292

runtime_expansions: Allowed attributes for runtime expansion.

427

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

428

disabled, or None

429

293

"""

430

294

431

295

runtime_expansions = ("approval_delay", "approval_duration",

432

296

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

433

297

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

434

298

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

435

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

436

"extended_timeout": "15m",

437

"interval": "2m",

438

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

439

"host": "",

440

"approval_delay": "0s",

441

"approval_duration": "1s",

442

"approved_by_default": "True",

443

"enabled": "True",

444

}

299

300

@staticmethod

301

def _timedelta_to_milliseconds(td):

302

"Convert a datetime.timedelta() to milliseconds"

303

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

304

+ (td.seconds * 1000)

305

+ (td.microseconds // 1000))

445

306

446

307

def timeout_milliseconds(self):

447

308

"Return the 'timeout' attribute in milliseconds"

448

return timedelta_to_milliseconds(self.timeout)

449

450

def extended_timeout_milliseconds(self):

451

"Return the 'extended_timeout' attribute in milliseconds"

452

return timedelta_to_milliseconds(self.extended_timeout)

309

return self._timedelta_to_milliseconds(self.timeout)

453

310

454

311

def interval_milliseconds(self):

455

312

"Return the 'interval' attribute in milliseconds"

456

return timedelta_to_milliseconds(self.interval)

457

313

return self._timedelta_to_milliseconds(self.interval)

314

458

315

def approval_delay_milliseconds(self):

459

return timedelta_to_milliseconds(self.approval_delay)

460

461

@staticmethod

462

def config_parser(config):

463

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

464

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

465

with exceptions for any special settings as defined above"""

466

settings = {}

467

for client_name in config.sections():

468

section = dict(config.items(client_name))

469

client = settings[client_name] = {}

470

471

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

472

# Reformat values from string types to Python types

473

client["approved_by_default"] = config.getboolean(

474

client_name, "approved_by_default")

475

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

476

477

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

478

.replace(" ", ""))

479

if "secret" in section:

480

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

481

elif "secfile" in section:

482

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

483

(section["secfile"])),

484

"rb") as secfile:

485

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

486

else:

487

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

488

% section)

489

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

490

client["extended_timeout"] = string_to_delta(

491

section["extended_timeout"])

492

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

493

client["approval_delay"] = string_to_delta(

494

section["approval_delay"])

495

client["approval_duration"] = string_to_delta(

496

section["approval_duration"])

497

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

498

client["last_approval_request"] = None

499

client["last_checked_ok"] = None

500

client["last_checker_status"] = None

501

if client["enabled"]:

502

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

503

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

504

+ client["timeout"])

505

else:

506

client["last_enabled"] = None

507

client["expires"] = None

508

509

return settings

510

511

512

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

316

return self._timedelta_to_milliseconds(self.approval_delay)

317

318

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

513

319

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

514

320

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

515

321

attribute."""

516

322

self.name = name

517

# adding all client settings

518

for setting, value in settings.iteritems():

519

setattr(self, setting, value)

520

323

if config is None:

324

config = {}

521

325

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

522

326

# Uppercase and remove spaces from fingerprint for later

523

327

# comparison purposes with return value from the fingerprint()

524

328

# function

329

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

330

.replace(" ", ""))

525

331

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

526

self.created = settings.get("created", datetime.datetime.utcnow())

527

528

# attributes specific for this server instance

332

if "secret" in config:

333

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

334

elif "secfile" in config:

335

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

336

(config["secfile"])),

337

"rb") as secfile:

338

self.secret = secfile.read()

339

else:

340

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

341

% self.name)

342

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

343

self.created = datetime.datetime.utcnow()

344

self.enabled = False

345

self.last_approval_request = None

346

self.last_enabled = None

347

self.last_checked_ok = None

348

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

349

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

350

self.disable_hook = disable_hook

529

351

self.checker = None

530

352

self.checker_initiator_tag = None

531

353

self.disable_initiator_tag = None

532

354

self.checker_callback_tag = None

355

self.checker_command = config["checker"]

533

356

self.current_checker_command = None

534

self.approved = None

357

self.last_connect = None

358

self._approved = None

359

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

360

True)

535

361

self.approvals_pending = 0

536

self.changedstate = (multiprocessing_manager

537

.Condition(multiprocessing_manager

538

.Lock()))

539

self.client_structure = [attr for attr in

540

self.__dict__.iterkeys()

541

if not attr.startswith("_")]

542

self.client_structure.append("client_structure")

543

544

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

545

lambda obj:

546

isinstance(obj,

547

property)):

548

if not name.startswith("_"):

549

self.client_structure.append(name)

362

self.approval_delay = string_to_delta(

363

config["approval_delay"])

364

self.approval_duration = string_to_delta(

365

config["approval_duration"])

366

self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())

550

367

551

# Send notice to process children that client state has changed

552

368

def send_changedstate(self):

553

with self.changedstate:

554

self.changedstate.notify_all()

555

369

self.changedstate.acquire()

370

self.changedstate.notify_all()

371

self.changedstate.release()

372

556

373

def enable(self):

557

374

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

558

375

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

559

376

# Already enabled

560

377

return

561

378

self.send_changedstate()

562

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

563

self.enabled = True

564

379

self.last_enabled = datetime.datetime.utcnow()

565

self.init_checker()

380

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

381

# and every interval from then on.

382

self.checker_initiator_tag = (gobject.timeout_add

383

(self.interval_milliseconds(),

384

self.start_checker))

385

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

386

self.disable_initiator_tag = (gobject.timeout_add

387

(self.timeout_milliseconds(),

388

self.disable))

389

self.enabled = True

390

# Also start a new checker *right now*.

391

self.start_checker()

566

392

567

393

def disable(self, quiet=True):

568

394

"""Disable this client."""

575

401

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

576

402

gobject.source_remove(self.disable_initiator_tag)

577

403

self.disable_initiator_tag = None

578

self.expires = None

579

404

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

580

405

gobject.source_remove(self.checker_initiator_tag)

581

406

self.checker_initiator_tag = None

582

407

self.stop_checker()

408

if self.disable_hook:

409

self.disable_hook(self)

583

410

self.enabled = False

584

411

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

585

412

return False

586

413

587

414

def __del__(self):

415

self.disable_hook = None

588

416

self.disable()

589

417

590

def init_checker(self):

591

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

592

# and every interval from then on.

593

self.checker_initiator_tag = (gobject.timeout_add

594

(self.interval_milliseconds(),

595

self.start_checker))

596

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

597

self.disable_initiator_tag = (gobject.timeout_add

598

(self.timeout_milliseconds(),

599

self.disable))

600

# Also start a new checker *right now*.

601

self.start_checker()

602

603

418

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

604

419

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

605

420

self.checker_callback_tag = None

606

421

self.checker = None

607

422

if os.WIFEXITED(condition):

608

self.last_checker_status = os.WEXITSTATUS(condition)

609

if self.last_checker_status == 0:

423

exitstatus = os.WEXITSTATUS(condition)

424

if exitstatus == 0:

610

425

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

611

426

vars(self))

612

427

self.checked_ok()

614

429

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

615

430

vars(self))

616

431

else:

617

self.last_checker_status = -1

618

432

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

619

433

vars(self))

620

434

621

def checked_ok(self, timeout=None):

435

def checked_ok(self):

622

436

"""Bump up the timeout for this client.

623

437

624

438

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

625

439

alive and well.

626

440

"""

627

if timeout is None:

628

timeout = self.timeout

629

441

self.last_checked_ok = datetime.datetime.utcnow()

630

if self.disable_initiator_tag is not None:

631

gobject.source_remove(self.disable_initiator_tag)

632

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

633

self.disable_initiator_tag = (gobject.timeout_add

634

(timedelta_to_milliseconds

635

(timeout), self.disable))

636

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

442

gobject.source_remove(self.disable_initiator_tag)

443

self.disable_initiator_tag = (gobject.timeout_add

444

(self.timeout_milliseconds(),

445

self.disable))

637

446

638

447

def need_approval(self):

639

448

self.last_approval_request = datetime.datetime.utcnow()

679

488

'replace')))

680

489

for attr in

681

490

self.runtime_expansions)

682

491

683

492

try:

684

493

command = self.checker_command % escaped_attrs

685

494

except TypeError as error:

731

540

raise

732

541

self.checker = None

733

542

734

735

543

def dbus_service_property(dbus_interface, signature="v",

736

544

access="readwrite", byte_arrays=False):

737

545

"""Decorators for marking methods of a DBusObjectWithProperties to

783

591

784

592

class DBusObjectWithProperties(dbus.service.Object):

785

593

"""A D-Bus object with properties.

786

594

787

595

Classes inheriting from this can use the dbus_service_property

788

596

decorator to expose methods as D-Bus properties. It exposes the

789

597

standard Get(), Set(), and GetAll() methods on the D-Bus.

796

604

def _get_all_dbus_properties(self):

797

605

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

798

606

"""

799

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

800

for cls in self.__class__.__mro__

607

return ((prop._dbus_name, prop)

801

608

for name, prop in

802

inspect.getmembers(cls, self._is_dbus_property))

609

inspect.getmembers(self, self._is_dbus_property))

803

610

804

611

def _get_dbus_property(self, interface_name, property_name):

805

612

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

806

613

property with the specified name and interface.

807

614

"""

808

for cls in self.__class__.__mro__:

809

for name, value in (inspect.getmembers

810

(cls, self._is_dbus_property)):

811

if (value._dbus_name == property_name

812

and value._dbus_interface == interface_name):

813

return value.__get__(self)

814

615

for name in (property_name,

616

property_name + "_dbus_property"):

617

prop = getattr(self, name, None)

618

if (prop is None

619

or not self._is_dbus_property(prop)

620

or prop._dbus_name != property_name

621

or (interface_name and prop._dbus_interface

622

and interface_name != prop._dbus_interface)):

623

continue

624

return prop

815

625

# No such property

816

626

raise DBusPropertyNotFound(self.dbus_object_path + ":"

817

627

+ interface_name + "."

851

661

def GetAll(self, interface_name):

852

662

"""Standard D-Bus property GetAll() method, see D-Bus

853

663

standard.

854

664

855

665

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

856

666

"""

857

properties = {}

667

all = {}

858

668

for name, prop in self._get_all_dbus_properties():

859

669

if (interface_name

860

670

and interface_name != prop._dbus_interface):

865

675

continue

866

676

value = prop()

867

677

if not hasattr(value, "variant_level"):

868

properties[name] = value

678

all[name] = value

869

679

continue

870

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

871

value.variant_level+1)

872

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

680

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

681

value.variant_level+1)

682

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

873

683

874

684

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

875

685

out_signature="s",

919

729

return xmlstring

920

730

921

731

922

def datetime_to_dbus (dt, variant_level=0):

923

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

924

if dt is None:

925

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

926

return dbus.String(dt.isoformat(),

927

variant_level=variant_level)

928

929

930

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

931

.__metaclass__):

932

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

933

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

934

"""

935

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

936

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

937

# methods, signals, or properties in them

938

for base in (b for b in bases

939

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

940

# Go though all attributes of the base class

941

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

942

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

943

# with the wrong interface name

944

if (not hasattr(attribute, "_dbus_interface")

945

or not attribute._dbus_interface

946

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

947

continue

948

# Create an alternate D-Bus interface name based on

949

# the current name

950

alt_interface = (attribute._dbus_interface

951

.replace("se.recompile.Mandos",

952

"se.bsnet.fukt.Mandos"))

953

# Is this a D-Bus signal?

954

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

955

# Extract the original non-method function by

956

# black magic

957

nonmethod_func = (dict(

958

zip(attribute.func_code.co_freevars,

959

attribute.__closure__))["func"]

960

.cell_contents)

961

# Create a new, but exactly alike, function

962

# object, and decorate it to be a new D-Bus signal

963

# with the alternate D-Bus interface name

964

new_function = (dbus.service.signal

965

(alt_interface,

966

attribute._dbus_signature)

967

(types.FunctionType(

968

nonmethod_func.func_code,

969

nonmethod_func.func_globals,

970

nonmethod_func.func_name,

971

nonmethod_func.func_defaults,

972

nonmethod_func.func_closure)))

973

# Define a creator of a function to call both the

974

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

975

# signals gets sent when the function is called

976

def fixscope(func1, func2):

977

"""This function is a scope container to pass

978

func1 and func2 to the "call_both" function

979

outside of its arguments"""

980

def call_both(*args, **kwargs):

981

"""This function will emit two D-Bus

982

signals by calling func1 and func2"""

983

func1(*args, **kwargs)

984

func2(*args, **kwargs)

985

return call_both

986

# Create the "call_both" function and add it to

987

# the class

988

attr[attrname] = fixscope(attribute,

989

new_function)

990

# Is this a D-Bus method?

991

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

992

# Create a new, but exactly alike, function

993

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

994

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

995

# to the class.

996

attr[attrname] = (dbus.service.method

997

(alt_interface,

998

attribute._dbus_in_signature,

999

attribute._dbus_out_signature)

1000

(types.FunctionType

1001

(attribute.func_code,

1002

attribute.func_globals,

1003

attribute.func_name,

1004

attribute.func_defaults,

1005

attribute.func_closure)))

1006

# Is this a D-Bus property?

1007

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

1008

# Create a new, but exactly alike, function

1009

# object, and decorate it to be a new D-Bus

1010

# property with the alternate D-Bus interface

1011

# name. Add it to the class.

1012

attr[attrname] = (dbus_service_property

1013

(alt_interface,

1014

attribute._dbus_signature,

1015

attribute._dbus_access,

1016

attribute

1017

._dbus_get_args_options

1018

["byte_arrays"])

1019

(types.FunctionType

1020

(attribute.func_code,

1021

attribute.func_globals,

1022

attribute.func_name,

1023

attribute.func_defaults,

1024

attribute.func_closure)))

1025

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

1026

1027

1028

732

class ClientDBus(Client, DBusObjectWithProperties):

1029

733

"""A Client class using D-Bus

1030

734

1039

743

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

1040

744

1041

745

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

746

self._approvals_pending = 0

1042

747

self.bus = bus

1043

748

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

1044

self._approvals_pending = 0

1045

1046

self._approvals_pending = 0

1047

749

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

1048

750

# the D-Bus

1049

751

client_object_name = unicode(self.name).translate(

1054

756

DBusObjectWithProperties.__init__(self, self.bus,

1055

757

self.dbus_object_path)

1056

758

1057

def notifychangeproperty(transform_func,

1058

dbus_name, type_func=lambda x: x,

1059

variant_level=1):

1060

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

1061

its changes to DBus.

1062

1063

transform_fun: Function that takes a value and a variant_level

1064

and transforms it to a D-Bus type.

1065

dbus_name: D-Bus name of the variable

1066

type_func: Function that transform the value before sending it

1067

to the D-Bus. Default: no transform

1068

variant_level: D-Bus variant level. Default: 1

1069

"""

1070

attrname = "_{0}".format(dbus_name)

1071

def setter(self, value):

1072

if hasattr(self, "dbus_object_path"):

1073

if (not hasattr(self, attrname) or

1074

type_func(getattr(self, attrname, None))

1075

!= type_func(value)):

1076

dbus_value = transform_func(type_func(value),

1077

variant_level

1078

=variant_level)

1079

self.PropertyChanged(dbus.String(dbus_name),

1080

dbus_value)

1081

setattr(self, attrname, value)

1082

1083

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

1084

1085

1086

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1087

approvals_pending = notifychangeproperty(dbus.Boolean,

1088

"ApprovalPending",

1089

type_func = bool)

1090

enabled = notifychangeproperty(dbus.Boolean, "Enabled")

1091

last_enabled = notifychangeproperty(datetime_to_dbus,

1092

"LastEnabled")

1093

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

1094

type_func = lambda checker:

1095

checker is not None)

1096

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1097

"LastCheckedOK")

1098

last_approval_request = notifychangeproperty(

1099

datetime_to_dbus, "LastApprovalRequest")

1100

approved_by_default = notifychangeproperty(dbus.Boolean,

1101

"ApprovedByDefault")

1102

approval_delay = notifychangeproperty(dbus.UInt64,

1103

"ApprovalDelay",

1104

type_func =

1105

timedelta_to_milliseconds)

1106

approval_duration = notifychangeproperty(

1107

dbus.UInt64, "ApprovalDuration",

1108

type_func = timedelta_to_milliseconds)

1109

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

1110

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

1111

type_func =

1112

timedelta_to_milliseconds)

1113

extended_timeout = notifychangeproperty(

1114

dbus.UInt64, "ExtendedTimeout",

1115

type_func = timedelta_to_milliseconds)

1116

interval = notifychangeproperty(dbus.UInt64,

1117

"Interval",

1118

type_func =

1119

timedelta_to_milliseconds)

1120

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

1121

1122

del notifychangeproperty

759

def _get_approvals_pending(self):

760

return self._approvals_pending

761

def _set_approvals_pending(self, value):

762

old_value = self._approvals_pending

763

self._approvals_pending = value

764

bval = bool(value)

765

if (hasattr(self, "dbus_object_path")

766

and bval is not bool(old_value)):

767

dbus_bool = dbus.Boolean(bval, variant_level=1)

768

self.PropertyChanged(dbus.String("ApprovalPending"),

769

dbus_bool)

770

771

approvals_pending = property(_get_approvals_pending,

772

_set_approvals_pending)

773

del _get_approvals_pending, _set_approvals_pending

774

775

@staticmethod

776

def _datetime_to_dbus(dt, variant_level=0):

777

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

778

return dbus.String(dt.isoformat(),

779

variant_level=variant_level)

780

781

def enable(self):

782

oldstate = getattr(self, "enabled", False)

783

r = Client.enable(self)

784

if oldstate != self.enabled:

785

# Emit D-Bus signals

786

self.PropertyChanged(dbus.String("Enabled"),

787

dbus.Boolean(True, variant_level=1))

788

self.PropertyChanged(

789

dbus.String("LastEnabled"),

790

self._datetime_to_dbus(self.last_enabled,

791

variant_level=1))

792

return r

793

794

def disable(self, quiet = False):

795

oldstate = getattr(self, "enabled", False)

796

r = Client.disable(self, quiet=quiet)

797

if not quiet and oldstate != self.enabled:

798

# Emit D-Bus signal

799

self.PropertyChanged(dbus.String("Enabled"),

800

dbus.Boolean(False, variant_level=1))

801

return r

1123

802

1124

803

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

1125

804

try:

1134

813

*args, **kwargs):

1135

814

self.checker_callback_tag = None

1136

815

self.checker = None

816

# Emit D-Bus signal

817

self.PropertyChanged(dbus.String("CheckerRunning"),

818

dbus.Boolean(False, variant_level=1))

1137

819

if os.WIFEXITED(condition):

1138

820

exitstatus = os.WEXITSTATUS(condition)

1139

821

# Emit D-Bus signal

1149

831

return Client.checker_callback(self, pid, condition, command,

1150

832

*args, **kwargs)

1151

833

834

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

835

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

836

# Emit D-Bus signal

837

self.PropertyChanged(

838

dbus.String("LastCheckedOK"),

839

(self._datetime_to_dbus(self.last_checked_ok,

840

variant_level=1)))

841

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastApprovalRequest"),

847

(self._datetime_to_dbus(self.last_approval_request,

848

variant_level=1)))

849

return r

850

1152

851

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

1153

852

old_checker = self.checker

1154

853

if self.checker is not None:

1161

860

and old_checker_pid != self.checker.pid):

1162

861

# Emit D-Bus signal

1163

862

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

1164

866

return r

1165

867

868

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

869

old_checker = getattr(self, "checker", None)

870

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

871

if (old_checker is not None

872

and getattr(self, "checker", None) is None):

873

self.PropertyChanged(dbus.String("CheckerRunning"),

874

dbus.Boolean(False, variant_level=1))

875

return r

876

1166

877

def _reset_approved(self):

1167

self.approved = None

878

self._approved = None

1168

879

return False

1169

880

1170

881

def approve(self, value=True):

1171

882

self.send_changedstate()

1172

self.approved = value

1173

gobject.timeout_add(timedelta_to_milliseconds

883

self._approved = value

884

gobject.timeout_add(self._timedelta_to_milliseconds

1174

885

(self.approval_duration),

1175

886

self._reset_approved)

1176

887

1177

888

1178

889

## D-Bus methods, signals & properties

1179

_interface = "se.recompile.Mandos.Client"

890

_interface = "se.bsnet.fukt.Mandos.Client"

1180

891

1181

892

## Signals

1182

893

1219

930

"D-Bus signal"

1220

931

return self.need_approval()

1221

932

1222

# NeRwequest - signal

1223

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

1224

def NewRequest(self, ip):

1225

"""D-Bus signal

1226

Is sent after a client request a password.

1227

"""

1228

pass

1229

1230

933

## Methods

1231

934

1232

935

# Approve - method

1276

979

if value is None: # get

1277

980

return dbus.Boolean(self.approved_by_default)

1278

981

self.approved_by_default = bool(value)

982

# Emit D-Bus signal

983

self.PropertyChanged(dbus.String("ApprovedByDefault"),

984

dbus.Boolean(value, variant_level=1))

1279

985

1280

986

# ApprovalDelay - property

1281

987

@dbus_service_property(_interface, signature="t",

1284

990

if value is None: # get

1285

991

return dbus.UInt64(self.approval_delay_milliseconds())

1286

992

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

993

# Emit D-Bus signal

994

self.PropertyChanged(dbus.String("ApprovalDelay"),

995

dbus.UInt64(value, variant_level=1))

1287

996

1288

997

# ApprovalDuration - property

1289

998

@dbus_service_property(_interface, signature="t",

1290

999

access="readwrite")

1291

1000

def ApprovalDuration_dbus_property(self, value=None):

1292

1001

if value is None: # get

1293

return dbus.UInt64(timedelta_to_milliseconds(

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1294

1003

self.approval_duration))

1295

1004

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

1005

# Emit D-Bus signal

1006

self.PropertyChanged(dbus.String("ApprovalDuration"),

1007

dbus.UInt64(value, variant_level=1))

1296

1008

1297

1009

# Name - property

1298

1010

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

1310

1022

def Host_dbus_property(self, value=None):

1311

1023

if value is None: # get

1312

1024

return dbus.String(self.host)

1313

self.host = unicode(value)

1025

self.host = value

1026

# Emit D-Bus signal

1027

self.PropertyChanged(dbus.String("Host"),

1028

dbus.String(value, variant_level=1))

1314

1029

1315

1030

# Created - property

1316

1031

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

1317

1032

def Created_dbus_property(self):

1318

return datetime_to_dbus(self.created)

1033

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

1319

1034

1320

1035

# LastEnabled - property

1321

1036

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

1322

1037

def LastEnabled_dbus_property(self):

1323

return datetime_to_dbus(self.last_enabled)

1038

if self.last_enabled is None:

1039

return dbus.String("")

1040

return dbus.String(self._datetime_to_dbus(self.last_enabled))

1324

1041

1325

1042

# Enabled - property

1326

1043

@dbus_service_property(_interface, signature="b",

1340

1057

if value is not None:

1341

1058

self.checked_ok()

1342

1059

return

1343

return datetime_to_dbus(self.last_checked_ok)

1344

1345

# Expires - property

1346

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

1347

def Expires_dbus_property(self):

1348

return datetime_to_dbus(self.expires)

1060

if self.last_checked_ok is None:

1061

return dbus.String("")

1062

return dbus.String(self._datetime_to_dbus(self

1063

.last_checked_ok))

1349

1064

1350

1065

# LastApprovalRequest - property

1351

1066

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

1352

1067

def LastApprovalRequest_dbus_property(self):

1353

return datetime_to_dbus(self.last_approval_request)

1068

if self.last_approval_request is None:

1069

return dbus.String("")

1070

return dbus.String(self.

1071

_datetime_to_dbus(self

1072

.last_approval_request))

1354

1073

1355

1074

# Timeout - property

1356

1075

@dbus_service_property(_interface, signature="t",

1359

1078

if value is None: # get

1360

1079

return dbus.UInt64(self.timeout_milliseconds())

1361

1080

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

1081

# Emit D-Bus signal

1082

self.PropertyChanged(dbus.String("Timeout"),

1083

dbus.UInt64(value, variant_level=1))

1362

1084

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

1363

1085

return

1364

1086

# Reschedule timeout

1365

1087

gobject.source_remove(self.disable_initiator_tag)

1366

1088

self.disable_initiator_tag = None

1367

self.expires = None

1368

time_to_die = timedelta_to_milliseconds((self

1369

.last_checked_ok

1370

+ self.timeout)

1371

- datetime.datetime

1372

.utcnow())

1089

time_to_die = (self.

1090

_timedelta_to_milliseconds((self

1091

.last_checked_ok

1092

+ self.timeout)

1093

- datetime.datetime

1094

.utcnow()))

1373

1095

if time_to_die <= 0:

1374

1096

# The timeout has passed

1375

1097

self.disable()

1376

1098

else:

1377

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

1378

+ datetime.timedelta(milliseconds =

1379

time_to_die))

1380

1099

self.disable_initiator_tag = (gobject.timeout_add

1381

1100

(time_to_die, self.disable))

1382

1101

1383

# ExtendedTimeout - property

1384

@dbus_service_property(_interface, signature="t",

1385

access="readwrite")

1386

def ExtendedTimeout_dbus_property(self, value=None):

1387

if value is None: # get

1388

return dbus.UInt64(self.extended_timeout_milliseconds())

1389

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

1390

1391

1102

# Interval - property

1392

1103

@dbus_service_property(_interface, signature="t",

1393

1104

access="readwrite")

1395

1106

if value is None: # get

1396

1107

return dbus.UInt64(self.interval_milliseconds())

1397

1108

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

1109

# Emit D-Bus signal

1110

self.PropertyChanged(dbus.String("Interval"),

1111

dbus.UInt64(value, variant_level=1))

1398

1112

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

1399

1113

return

1400

if self.enabled:

1401

# Reschedule checker run

1402

gobject.source_remove(self.checker_initiator_tag)

1403

self.checker_initiator_tag = (gobject.timeout_add

1404

(value, self.start_checker))

1405

self.start_checker() # Start one now, too

1406

1114

# Reschedule checker run

1115

gobject.source_remove(self.checker_initiator_tag)

1116

self.checker_initiator_tag = (gobject.timeout_add

1117

(value, self.start_checker))

1118

self.start_checker() # Start one now, too

1119

1407

1120

# Checker - property

1408

1121

@dbus_service_property(_interface, signature="s",

1409

1122

access="readwrite")

1410

1123

def Checker_dbus_property(self, value=None):

1411

1124

if value is None: # get

1412

1125

return dbus.String(self.checker_command)

1413

self.checker_command = unicode(value)

1126

self.checker_command = value

1127

# Emit D-Bus signal

1128

self.PropertyChanged(dbus.String("Checker"),

1129

dbus.String(self.checker_command,

1130

variant_level=1))

1414

1131

1415

1132

# CheckerRunning - property

1416

1133

@dbus_service_property(_interface, signature="b",

1443

1160

self._pipe.send(('init', fpr, address))

1444

1161

if not self._pipe.recv():

1445

1162

raise KeyError()

1446

1163

1447

1164

def __getattribute__(self, name):

1448

if name == '_pipe':

1165

if(name == '_pipe'):

1449

1166

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

1450

1167

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

1451

1168

data = self._pipe.recv()

1456

1173

self._pipe.send(('funcall', name, args, kwargs))

1457

1174

return self._pipe.recv()[1]

1458

1175

return func

1459

1176

1460

1177

def __setattr__(self, name, value):

1461

if name == '_pipe':

1178

if(name == '_pipe'):

1462

1179

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

1463

1180

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

1464

1181

1465

1182

1466

class ClientDBusTransitional(ClientDBus):

1467

__metaclass__ = AlternateDBusNamesMetaclass

1468

1469

1470

1183

class ClientHandler(socketserver.BaseRequestHandler, object):

1471

1184

"""A class to handle client connections.

1472

1185

1479

1192

unicode(self.client_address))

1480

1193

logger.debug("Pipe FD: %d",

1481

1194

self.server.child_pipe.fileno())

1482

1195

1483

1196

session = (gnutls.connection

1484

1197

.ClientSession(self.request,

1485

1198

gnutls.connection

1486

1199

.X509Credentials()))

1487

1200

1488

1201

# Note: gnutls.connection.X509Credentials is really a

1489

1202

# generic GnuTLS certificate credentials object so long as

1490

1203

# no X.509 keys are added to it. Therefore, we can use it

1491

1204

# here despite using OpenPGP certificates.

1492

1205

1493

1206

#priority = ':'.join(("NONE", "+VERS-TLS1.1",

1494

1207

# "+AES-256-CBC", "+SHA1",

1495

1208

# "+COMP-NULL", "+CTYPE-OPENPGP",

1501

1214

(gnutls.library.functions

1502

1215

.gnutls_priority_set_direct(session._c_object,

1503

1216

priority, None))

1504

1217

1505

1218

# Start communication using the Mandos protocol

1506

1219

# Get protocol number

1507

1220

line = self.request.makefile().readline()

1512

1225

except (ValueError, IndexError, RuntimeError) as error:

1513

1226

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

1514

1227

return

1515

1228

1516

1229

# Start GnuTLS connection

1517

1230

try:

1518

1231

session.handshake()

1522

1235

# established. Just abandon the request.

1523

1236

return

1524

1237

logger.debug("Handshake succeeded")

1525

1238

1526

1239

approval_required = False

1527

1240

try:

1528

1241

try:

1533

1246

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

1534

1247

return

1535

1248

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

1536

1249

1537

1250

try:

1538

1251

client = ProxyClient(child_pipe, fpr,

1539

1252

self.client_address)

1540

1253

except KeyError:

1541

1254

return

1542

1255

1543

if self.server.use_dbus:

1544

# Emit D-Bus signal

1545

client.NewRequest(str(self.client_address))

1546

1547

1256

if client.approval_delay:

1548

1257

delay = client.approval_delay

1549

1258

client.approvals_pending += 1

1551

1260

1552

1261

while True:

1553

1262

if not client.enabled:

1554

logger.info("Client %s is disabled",

1263

logger.warning("Client %s is disabled",

1555

1264

client.name)

1556

1265

if self.server.use_dbus:

1557

1266

# Emit D-Bus signal

1558

client.Rejected("Disabled")

1267

client.Rejected("Disabled")

1559

1268

return

1560

1269

1561

if client.approved or not client.approval_delay:

1270

if client._approved or not client.approval_delay:

1562

1271

#We are approved or approval is disabled

1563

1272

break

1564

elif client.approved is None:

1273

elif client._approved is None:

1565

1274

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

1566

1275

client.name)

1567

1276

if self.server.use_dbus:

1578

1287

return

1579

1288

1580

1289

#wait until timeout or approved

1290

#x = float(client._timedelta_to_milliseconds(delay))

1581

1291

time = datetime.datetime.now()

1582

1292

client.changedstate.acquire()

1583

(client.changedstate.wait

1584

(float(client.timedelta_to_milliseconds(delay)

1585

/ 1000)))

1293

client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))

1586

1294

client.changedstate.release()

1587

1295

time2 = datetime.datetime.now()

1588

1296

if (time2 - time) >= delay:

1610

1318

sent, len(client.secret)

1611

1319

- (sent_size + sent))

1612

1320

sent_size += sent

1613

1321

1614

1322

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

1615

# bump the timeout using extended_timeout

1616

client.checked_ok(client.extended_timeout)

1323

# bump the timeout as if seen

1324

client.checked_ok()

1617

1325

if self.server.use_dbus:

1618

1326

# Emit D-Bus signal

1619

1327

client.GotSecret()

1686

1394

# Convert the buffer to a Python bytestring

1687

1395

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

1688

1396

# Convert the bytestring to hexadecimal notation

1689

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

1397

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

1690

1398

return hex_fpr

1691

1399

1692

1400

1695

1403

def sub_process_main(self, request, address):

1696

1404

try:

1697

1405

self.finish_request(request, address)

1698

except Exception:

1406

except:

1699

1407

self.handle_error(request, address)

1700

1408

self.close_request(request)

1701

1409

1702

1410

def process_request(self, request, address):

1703

1411

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

1704

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

1705

args = (request,

1706

address))

1707

proc.start()

1708

return proc

1709

1412

multiprocessing.Process(target = self.sub_process_main,

1413

args = (request, address)).start()

1710

1414

1711

1415

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1712

1416

""" adds a pipe to the MixIn """

1716

1420

This function creates a new pipe in self.pipe

1717

1421

"""

1718

1422

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1719

1720

proc = MultiprocessingMixIn.process_request(self, request,

1721

client_address)

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

1722

1426

self.child_pipe.close()

1723

self.add_pipe(parent_pipe, proc)

1724

1725

def add_pipe(self, parent_pipe, proc):

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

1726

1430

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

1727

1431

raise NotImplementedError

1728

1432

1729

1730

1433

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1731

1434

socketserver.TCPServer, object):

1732

1435

"""IPv6-capable TCP server. Accepts 'None' as address and/or port

1806

1509

self.enabled = False

1807

1510

self.clients = clients

1808

1511

if self.clients is None:

1809

self.clients = {}

1512

self.clients = set()

1810

1513

self.use_dbus = use_dbus

1811

1514

self.gnutls_priority = gnutls_priority

1812

1515

IPv6_TCPServer.__init__(self, server_address,

1816

1519

def server_activate(self):

1817

1520

if self.enabled:

1818

1521

return socketserver.TCPServer.server_activate(self)

1819

1820

1522

def enable(self):

1821

1523

self.enabled = True

1822

1823

def add_pipe(self, parent_pipe, proc):

1524

def add_pipe(self, parent_pipe):

1824

1525

# Call "handle_ipc" for both data and EOF events

1825

1526

gobject.io_add_watch(parent_pipe.fileno(),

1826

1527

gobject.IO_IN | gobject.IO_HUP,

1827

1528

functools.partial(self.handle_ipc,

1828

parent_pipe =

1829

parent_pipe,

1830

proc = proc))

1831

1529

parent_pipe = parent_pipe))

1530

1832

1531

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

1833

proc = None, client_object=None):

1532

client_object=None):

1834

1533

condition_names = {

1835

1534

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

1836

1535

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

1845

1544

for cond, name in

1846

1545

condition_names.iteritems()

1847

1546

if cond & condition)

1848

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

1547

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

1849

1548

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

1850

# Wait for other process to exit

1851

proc.join()

1852

1549

return False

1853

1550

1854

1551

# Read a request from the child

1859

1556

fpr = request[1]

1860

1557

address = request[2]

1861

1558

1862

for c in self.clients.itervalues():

1559

for c in self.clients:

1863

1560

if c.fingerprint == fpr:

1864

1561

client = c

1865

1562

break

1866

1563

else:

1867

logger.info("Client not found for fingerprint: %s, ad"

1868

"dress: %s", fpr, address)

1564

logger.warning("Client not found for fingerprint: %s, ad"

1565

"dress: %s", fpr, address)

1869

1566

if self.use_dbus:

1870

1567

# Emit D-Bus signal

1871

mandos_dbus_service.ClientNotFound(fpr,

1872

address[0])

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

1873

1569

parent_pipe.send(False)

1874

1570

return False

1875

1571

1876

1572

gobject.io_add_watch(parent_pipe.fileno(),

1877

1573

gobject.IO_IN | gobject.IO_HUP,

1878

1574

functools.partial(self.handle_ipc,

1879

parent_pipe =

1880

parent_pipe,

1881

proc = proc,

1882

client_object =

1883

client))

1575

parent_pipe = parent_pipe,

1576

client_object = client))

1884

1577

parent_pipe.send(True)

1885

# remove the old hook in favor of the new above hook on

1886

# same fileno

1578

# remove the old hook in favor of the new above hook on same fileno

1887

1579

return False

1888

1580

if command == 'funcall':

1889

1581

funcname = request[1]

1890

1582

args = request[2]

1891

1583

kwargs = request[3]

1892

1584

1893

parent_pipe.send(('data', getattr(client_object,

1894

funcname)(*args,

1895

**kwargs)))

1896

1585

parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))

1586

1897

1587

if command == 'getattr':

1898

1588

attrname = request[1]

1899

1589

if callable(client_object.__getattribute__(attrname)):

1900

1590

parent_pipe.send(('function',))

1901

1591

else:

1902

parent_pipe.send(('data', client_object

1903

.__getattribute__(attrname)))

1592

parent_pipe.send(('data', client_object.__getattribute__(attrname)))

1904

1593

1905

1594

if command == 'setattr':

1906

1595

attrname = request[1]

1907

1596

value = request[2]

1908

1597

setattr(client_object, attrname, value)

1909

1598

1910

1599

return True

1911

1600

1912

1601

1949

1638

return timevalue

1950

1639

1951

1640

1641

def if_nametoindex(interface):

1642

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

1643

1644

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

1645

global if_nametoindex

1646

try:

1647

if_nametoindex = (ctypes.cdll.LoadLibrary

1648

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

1649

.if_nametoindex)

1650

except (OSError, AttributeError):

1651

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

1652

def if_nametoindex(interface):

1653

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

1654

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

1655

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

1656

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1657

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

1658

interface))

1659

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

1660

ifreq[16:20])[0]

1661

return interface_index

1662

return if_nametoindex(interface)

1663

1664

1952

1665

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

1953

1666

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

1954

1667

2009

1722

" system bus interface")

2010

1723

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

2011

1724

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

2012

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

2013

dest="restore", help="Do not restore stored"

2014

" state")

2015

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

2016

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

2017

2018

1725

options = parser.parse_args()

2019

1726

2020

1727

if options.check:

2033

1740

"use_dbus": "True",

2034

1741

"use_ipv6": "True",

2035

1742

"debuglevel": "",

2036

"restore": "True",

2037

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

2038

1743

}

2039

1744

2040

1745

# Parse config file for server-global settings

2057

1762

# options, if set.

2058

1763

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

2059

1764

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

2060

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

2061

"statedir"):

1765

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

2062

1766

value = getattr(options, option)

2063

1767

if value is not None:

2064

1768

server_settings[option] = value

2076

1780

debuglevel = server_settings["debuglevel"]

2077

1781

use_dbus = server_settings["use_dbus"]

2078

1782

use_ipv6 = server_settings["use_ipv6"]

2079

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

2080

stored_state_file)

2081

2082

if debug:

2083

initlogger(debug, logging.DEBUG)

2084

else:

2085

if not debuglevel:

2086

initlogger(debug)

2087

else:

2088

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

2089

initlogger(debug, level)

2090

1783

2091

1784

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

2092

1785

syslogger.setFormatter(logging.Formatter

2093

1786

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

2095

1788

% server_settings["servicename"]))

2096

1789

2097

1790

# Parse config file with clients

2098

client_config = configparser.SafeConfigParser(Client.client_defaults)

1791

client_defaults = { "timeout": "1h",

1792

"interval": "5m",

1793

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

1794

"host": "",

1795

"approval_delay": "0s",

1796

"approval_duration": "1s",

1797

}

1798

client_config = configparser.SafeConfigParser(client_defaults)

2099

1799

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

2100

1800

"clients.conf"))

2101

1801

2139

1839

if error[0] != errno.EPERM:

2140

1840

raise error

2141

1841

1842

if not debug and not debuglevel:

1843

syslogger.setLevel(logging.WARNING)

1844

console.setLevel(logging.WARNING)

1845

if debuglevel:

1846

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

1847

syslogger.setLevel(level)

1848

console.setLevel(level)

1849

2142

1850

if debug:

2143

1851

# Enable all possible GnuTLS debugging

2144

1852

2158

1866

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

2159

1867

if null > 2:

2160

1868

os.close(null)

1869

else:

1870

# No console logging

1871

logger.removeHandler(console)

2161

1872

2162

1873

# Need to fork before connecting to D-Bus

2163

1874

if not debug:

2164

1875

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

2165

1876

daemon()

2166

1877

2167

gobject.threads_init()

2168

2169

1878

global main_loop

2170

1879

# From the Avahi example code

2171

1880

DBusGMainLoop(set_as_default=True )

2174

1883

# End of Avahi example code

2175

1884

if use_dbus:

2176

1885

try:

2177

bus_name = dbus.service.BusName("se.recompile.Mandos",

1886

bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",

2178

1887

bus, do_not_queue=True)

2179

old_bus_name = (dbus.service.BusName

2180

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

2181

do_not_queue=True))

2182

1888

except dbus.exceptions.NameExistsException as e:

2183

1889

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

2184

1890

use_dbus = False

2185

1891

server_settings["use_dbus"] = False

2186

1892

tcp_server.use_dbus = False

2187

1893

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2188

service = AvahiServiceToSyslog(name =

2189

server_settings["servicename"],

2190

servicetype = "_mandos._tcp",

2191

protocol = protocol, bus = bus)

1894

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

1895

servicetype = "_mandos._tcp",

1896

protocol = protocol, bus = bus)

2192

1897

if server_settings["interface"]:

2193

1898

service.interface = (if_nametoindex

2194

1899

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

2198

1903

2199

1904

client_class = Client

2200

1905

if use_dbus:

2201

client_class = functools.partial(ClientDBusTransitional,

2202

bus = bus)

2203

2204

client_settings = Client.config_parser(client_config)

2205

old_client_settings = {}

2206

clients_data = {}

2207

2208

# Get client data and settings from last running state.

2209

if server_settings["restore"]:

2210

try:

2211

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

2212

clients_data, old_client_settings = (pickle.load

2213

(stored_state))

2214

os.remove(stored_state_path)

2215

except IOError as e:

2216

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

2217

.format(e))

2218

if e.errno != errno.ENOENT:

2219

raise

2220

except EOFError as e:

2221

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

2222

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

2223

2224

with PGPEngine() as pgp:

2225

for client_name, client in clients_data.iteritems():

2226

# Decide which value to use after restoring saved state.

2227

# We have three different values: Old config file,

2228

# new config file, and saved state.

2229

# New config value takes precedence if it differs from old

2230

# config value, otherwise use saved state.

2231

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

2232

try:

2233

# For each value in new config, check if it

2234

# differs from the old config value (Except for

2235

# the "secret" attribute)

2236

if (name != "secret" and

2237

value != old_client_settings[client_name]

2238

[name]):

2239

client[name] = value

2240

except KeyError:

2241

pass

2242

2243

# Clients who has passed its expire date can still be

2244

# enabled if its last checker was successful. Clients

2245

# whose checker failed before we stored its state is

2246

# assumed to have failed all checkers during downtime.

2247

if client["enabled"]:

2248

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

2249

if not client["last_checked_ok"]:

2250

logger.warning(

2251

"disabling client {0} - Client never "

2252

"performed a successfull checker"

2253

.format(client["name"]))

2254

client["enabled"] = False

2255

elif client["last_checker_status"] != 0:

2256

logger.warning(

2257

"disabling client {0} - Client "

2258

"last checker failed with error code {1}"

2259

.format(client["name"],

2260

client["last_checker_status"]))

2261

client["enabled"] = False

2262

else:

2263

client["expires"] = (datetime.datetime

2264

.utcnow()

2265

+ client["timeout"])

2266

1906

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

1907

def client_config_items(config, section):

1908

special_settings = {

1909

"approved_by_default":

1910

lambda: config.getboolean(section,

1911

"approved_by_default"),

1912

}

1913

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

2267

1914

try:

2268

client["secret"] = (

2269

pgp.decrypt(client["encrypted_secret"],

2270

client_settings[client_name]

2271

["secret"]))

2272

except PGPError:

2273

# If decryption fails, we use secret from new settings

2274

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

2275

.format(client_name))

2276

client["secret"] = (

2277

client_settings[client_name]["secret"])

2278

2279

2280

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

2281

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

2282

del clients_data[client_name]

2283

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

2284

clients_data[client_name] = client_settings[client_name]

2285

2286

# Create clients all clients

2287

for client_name, client in clients_data.iteritems():

2288

tcp_server.clients[client_name] = client_class(

2289

name = client_name, settings = client)

2290

1915

yield (name, special_settings[name]())

1916

except KeyError:

1917

yield (name, value)

1918

1919

tcp_server.clients.update(set(

1920

client_class(name = section,

1921

config= dict(client_config_items(

1922

client_config, section)))

1923

for section in client_config.sections()))

2291

1924

if not tcp_server.clients:

2292

1925

logger.warning("No clients defined")

2293

1926

2304

1937

# "pidfile" was never created

2305

1938

pass

2306

1939

del pidfilename

1940

2307

1941

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

2308

1942

2309

1943

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

2310

1944

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

2311

1945

2314

1948

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

2315

1949

def __init__(self):

2316

1950

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

2317

_interface = "se.recompile.Mandos"

1951

_interface = "se.bsnet.fukt.Mandos"

2318

1952

2319

1953

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

2320

1954

def ClientAdded(self, objpath):

2335

1969

def GetAllClients(self):

2336

1970

"D-Bus method"

2337

1971

return dbus.Array(c.dbus_object_path

2338

for c in

2339

tcp_server.clients.itervalues())

1972

for c in tcp_server.clients)

2340

1973

2341

1974

@dbus.service.method(_interface,

2342

1975

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

2344

1977

"D-Bus method"

2345

1978

return dbus.Dictionary(

2346

1979

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

2347

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

1980

for c in tcp_server.clients),

2348

1981

signature="oa{sv}")

2349

1982

2350

1983

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

2351

1984

def RemoveClient(self, object_path):

2352

1985

"D-Bus method"

2353

for c in tcp_server.clients.itervalues():

1986

for c in tcp_server.clients:

2354

1987

if c.dbus_object_path == object_path:

2355

del tcp_server.clients[c.name]

1988

tcp_server.clients.remove(c)

2356

1989

c.remove_from_connection()

2357

1990

# Don't signal anything except ClientRemoved

2358

1991

c.disable(quiet=True)

2363

1996

2364

1997

del _interface

2365

1998

2366

class MandosDBusServiceTransitional(MandosDBusService):

2367

__metaclass__ = AlternateDBusNamesMetaclass

2368

mandos_dbus_service = MandosDBusServiceTransitional()

1999

mandos_dbus_service = MandosDBusService()

2369

2000

2370

2001

def cleanup():

2371

2002

"Cleanup function; run on exit"

2372

2003

service.cleanup()

2373

2004

2374

multiprocessing.active_children()

2375

if not (tcp_server.clients or client_settings):

2376

return

2377

2378

# Store client before exiting. Secrets are encrypted with key

2379

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

2380

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

2381

clients = {}

2382

with PGPEngine() as pgp:

2383

for client in tcp_server.clients.itervalues():

2384

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

2385

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

2386

key)

2387

client_dict = {}

2388

2389

# A list of attributes that can not be pickled

2390

# + secret.

2391

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

2392

"checker"))

2393

for name, typ in (inspect.getmembers

2394

(dbus.service.Object)):

2395

exclude.add(name)

2396

2397

client_dict["encrypted_secret"] = (client

2398

.encrypted_secret)

2399

for attr in client.client_structure:

2400

if attr not in exclude:

2401

client_dict[attr] = getattr(client, attr)

2402

2403

clients[client.name] = client_dict

2404

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

2405

2406

try:

2407

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

2408

prefix="clients-",

2409

dir=os.path.dirname

2410

(stored_state_path))

2411

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

2412

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

2413

os.rename(tempname, stored_state_path)

2414

except (IOError, OSError) as e:

2415

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

2416

.format(e))

2417

if not debug:

2418

try:

2419

os.remove(tempname)

2420

except NameError:

2421

pass

2422

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

2423

errno.EEXIST)):

2424

raise e

2425

2426

# Delete all clients, and settings from config

2427

2005

while tcp_server.clients:

2428

name, client = tcp_server.clients.popitem()

2006

client = tcp_server.clients.pop()

2429

2007

if use_dbus:

2430

2008

client.remove_from_connection()

2009

client.disable_hook = None

2431

2010

# Don't signal anything except ClientRemoved

2432

2011

client.disable(quiet=True)

2433

2012

if use_dbus:

2434

2013

# Emit D-Bus signal

2435

mandos_dbus_service.ClientRemoved(client

2436

.dbus_object_path,

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2437

2015

client.name)

2438

client_settings.clear()

2439

2016

2440

2017

atexit.register(cleanup)

2441

2018

2442

for client in tcp_server.clients.itervalues():

2019

for client in tcp_server.clients:

2443

2020

if use_dbus:

2444

2021

# Emit D-Bus signal

2445

2022

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2446

# Need to initiate checking of clients

2447

if client.enabled:

2448

client.init_checker()

2023

client.enable()

2449

2024

2450

2025

tcp_server.enable()

2451

2026

tcp_server.server_activate()