/mandos/trunk : revision 493

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

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 = "1.3.1"

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()

297

191

avahi.DBUS_INTERFACE_ENTRY_GROUP)

298

192

self.entry_group_state_changed_match = (

299

193

self.group.connect_to_signal(

300

'StateChanged', self.entry_group_state_changed))

194

'StateChanged', self .entry_group_state_changed))

301

195

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

302

196

self.name, self.type)

303

197

self.group.AddService(

329

223

try:

330

224

self.group.Free()

331

225

except (dbus.exceptions.UnknownMethodException,

332

dbus.exceptions.DBusException):

226

dbus.exceptions.DBusException) as e:

333

227

pass

334

228

self.group = None

335

229

self.remove()

369

263

self.server_state_changed)

370

264

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

371

265

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

266

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

267

class Client(object):

389

268

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

390

269

391

270

Attributes:

392

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

271

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

393

272

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

394

273

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

395

274

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

402

281

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

403

282

checker_initiator_tag: a gobject event source tag, or None

404

283

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

284

current_checker_command: string; current running checker_command

285

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

408

286

disable_initiator_tag: a gobject event source tag, or None

409

287

enabled: bool()

410

288

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

413

291

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

414

292

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

415

293

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

294

last_enabled: datetime.datetime(); (UTC)

420

295

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

421

296

D-Bus identifiers

422

297

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

423

298

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

424

299

until this client is disabled

425

extended_timeout: extra long timeout when password has been sent

426

300

runtime_expansions: Allowed attributes for runtime expansion.

427

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

428

disabled, or None

429

301

"""

430

302

431

303

runtime_expansions = ("approval_delay", "approval_duration",

432

304

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

433

305

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

434

306

"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

}

307

308

@staticmethod

309

def _timedelta_to_milliseconds(td):

310

"Convert a datetime.timedelta() to milliseconds"

311

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

312

+ (td.seconds * 1000)

313

+ (td.microseconds // 1000))

445

314

446

315

def timeout_milliseconds(self):

447

316

"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)

317

return self._timedelta_to_milliseconds(self.timeout)

453

318

454

319

def interval_milliseconds(self):

455

320

"Return the 'interval' attribute in milliseconds"

456

return timedelta_to_milliseconds(self.interval)

457

321

return self._timedelta_to_milliseconds(self.interval)

322

458

323

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

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

467

value given the same arguments.

468

"""

469

settings = {}

470

for client_name in config.sections():

471

section = dict(config.items(client_name))

472

client = settings[client_name] = {}

473

474

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

475

# Reformat values from string types to Python types

476

client["approved_by_default"] = config.getboolean(

477

client_name, "approved_by_default")

478

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

479

"enabled")

480

481

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

482

.replace(" ", ""))

483

if "secret" in section:

484

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

485

elif "secfile" in section:

486

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

487

(section["secfile"])),

488

"rb") as secfile:

489

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

490

else:

491

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

492

% section)

493

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

494

client["extended_timeout"] = string_to_delta(

495

section["extended_timeout"])

496

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

497

client["approval_delay"] = string_to_delta(

498

section["approval_delay"])

499

client["approval_duration"] = string_to_delta(

500

section["approval_duration"])

501

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

502

client["last_approval_request"] = None

503

client["last_checked_ok"] = None

504

client["last_checker_status"] = None

505

506

return settings

507

508

509

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

324

return self._timedelta_to_milliseconds(self.approval_delay)

325

326

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

510

327

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

511

328

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

512

329

attribute."""

513

330

self.name = name

514

# adding all client settings

515

for setting, value in settings.iteritems():

516

setattr(self, setting, value)

517

518

if self.enabled:

519

if not hasattr(self, "last_enabled"):

520

self.last_enabled = datetime.datetime.utcnow()

521

if not hasattr(self, "expires"):

522

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

523

+ self.timeout)

524

else:

525

self.last_enabled = None

526

self.expires = None

527

331

if config is None:

332

config = {}

528

333

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

529

334

# Uppercase and remove spaces from fingerprint for later

530

335

# comparison purposes with return value from the fingerprint()

531

336

# function

337

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

338

.replace(" ", ""))

532

339

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

533

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

534

datetime.datetime.utcnow())

535

536

# attributes specific for this server instance

340

if "secret" in config:

341

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

342

elif "secfile" in config:

343

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

344

(config["secfile"])),

345

"rb") as secfile:

346

self.secret = secfile.read()

347

else:

348

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

349

% self.name)

350

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

351

self.created = datetime.datetime.utcnow()

352

self.enabled = False

353

self.last_approval_request = None

354

self.last_enabled = None

355

self.last_checked_ok = None

356

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

357

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

358

self.disable_hook = disable_hook

537

359

self.checker = None

538

360

self.checker_initiator_tag = None

539

361

self.disable_initiator_tag = None

540

362

self.checker_callback_tag = None

363

self.checker_command = config["checker"]

541

364

self.current_checker_command = None

542

self.approved = None

365

self.last_connect = None

366

self._approved = None

367

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

368

True)

543

369

self.approvals_pending = 0

544

self.changedstate = (multiprocessing_manager

545

.Condition(multiprocessing_manager

546

.Lock()))

547

self.client_structure = [attr for attr in

548

self.__dict__.iterkeys()

549

if not attr.startswith("_")]

550

self.client_structure.append("client_structure")

551

552

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

553

lambda obj:

554

isinstance(obj,

555

property)):

556

if not name.startswith("_"):

557

self.client_structure.append(name)

370

self.approval_delay = string_to_delta(

371

config["approval_delay"])

372

self.approval_duration = string_to_delta(

373

config["approval_duration"])

374

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

558

375

559

# Send notice to process children that client state has changed

560

376

def send_changedstate(self):

561

with self.changedstate:

562

self.changedstate.notify_all()

563

377

self.changedstate.acquire()

378

self.changedstate.notify_all()

379

self.changedstate.release()

380

564

381

def enable(self):

565

382

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

566

383

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

567

384

# Already enabled

568

385

return

569

386

self.send_changedstate()

570

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

571

self.enabled = True

572

387

self.last_enabled = datetime.datetime.utcnow()

573

self.init_checker()

388

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

389

# and every interval from then on.

390

self.checker_initiator_tag = (gobject.timeout_add

391

(self.interval_milliseconds(),

392

self.start_checker))

393

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

394

self.disable_initiator_tag = (gobject.timeout_add

395

(self.timeout_milliseconds(),

396

self.disable))

397

self.enabled = True

398

# Also start a new checker *right now*.

399

self.start_checker()

574

400

575

401

def disable(self, quiet=True):

576

402

"""Disable this client."""

583

409

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

584

410

gobject.source_remove(self.disable_initiator_tag)

585

411

self.disable_initiator_tag = None

586

self.expires = None

587

412

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

588

413

gobject.source_remove(self.checker_initiator_tag)

589

414

self.checker_initiator_tag = None

590

415

self.stop_checker()

416

if self.disable_hook:

417

self.disable_hook(self)

591

418

self.enabled = False

592

419

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

593

420

return False

594

421

595

422

def __del__(self):

423

self.disable_hook = None

596

424

self.disable()

597

425

598

def init_checker(self):

599

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

600

# and every interval from then on.

601

self.checker_initiator_tag = (gobject.timeout_add

602

(self.interval_milliseconds(),

603

self.start_checker))

604

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

605

self.disable_initiator_tag = (gobject.timeout_add

606

(self.timeout_milliseconds(),

607

self.disable))

608

# Also start a new checker *right now*.

609

self.start_checker()

610

611

426

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

612

427

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

613

428

self.checker_callback_tag = None

614

429

self.checker = None

615

430

if os.WIFEXITED(condition):

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

431

exitstatus = os.WEXITSTATUS(condition)

432

if exitstatus == 0:

618

433

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

619

434

vars(self))

620

435

self.checked_ok()

622

437

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

623

438

vars(self))

624

439

else:

625

self.last_checker_status = -1

626

440

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

627

441

vars(self))

628

442

629

def checked_ok(self, timeout=None):

443

def checked_ok(self):

630

444

"""Bump up the timeout for this client.

631

445

632

446

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

633

447

alive and well.

634

448

"""

635

if timeout is None:

636

timeout = self.timeout

637

449

self.last_checked_ok = datetime.datetime.utcnow()

638

if self.disable_initiator_tag is not None:

639

gobject.source_remove(self.disable_initiator_tag)

640

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

641

self.disable_initiator_tag = (gobject.timeout_add

642

(timedelta_to_milliseconds

643

(timeout), self.disable))

644

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

450

gobject.source_remove(self.disable_initiator_tag)

451

self.disable_initiator_tag = (gobject.timeout_add

452

(self.timeout_milliseconds(),

453

self.disable))

645

454

646

455

def need_approval(self):

647

456

self.last_approval_request = datetime.datetime.utcnow()

687

496

'replace')))

688

497

for attr in

689

498

self.runtime_expansions)

690

499

691

500

try:

692

501

command = self.checker_command % escaped_attrs

693

502

except TypeError as error:

739

548

raise

740

549

self.checker = None

741

550

742

743

551

def dbus_service_property(dbus_interface, signature="v",

744

552

access="readwrite", byte_arrays=False):

745

553

"""Decorators for marking methods of a DBusObjectWithProperties to

791

599

792

600

class DBusObjectWithProperties(dbus.service.Object):

793

601

"""A D-Bus object with properties.

794

602

795

603

Classes inheriting from this can use the dbus_service_property

796

604

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

797

605

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

804

612

def _get_all_dbus_properties(self):

805

613

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

806

614

"""

807

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

808

for cls in self.__class__.__mro__

615

return ((prop._dbus_name, prop)

809

616

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

617

inspect.getmembers(self, self._is_dbus_property))

811

618

812

619

def _get_dbus_property(self, interface_name, property_name):

813

620

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

814

621

property with the specified name and interface.

815

622

"""

816

for cls in self.__class__.__mro__:

817

for name, value in (inspect.getmembers

818

(cls, self._is_dbus_property)):

819

if (value._dbus_name == property_name

820

and value._dbus_interface == interface_name):

821

return value.__get__(self)

822

623

for name in (property_name,

624

property_name + "_dbus_property"):

625

prop = getattr(self, name, None)

626

if (prop is None

627

or not self._is_dbus_property(prop)

628

or prop._dbus_name != property_name

629

or (interface_name and prop._dbus_interface

630

and interface_name != prop._dbus_interface)):

631

continue

632

return prop

823

633

# No such property

824

634

raise DBusPropertyNotFound(self.dbus_object_path + ":"

825

635

+ interface_name + "."

859

669

def GetAll(self, interface_name):

860

670

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

861

671

standard.

862

672

863

673

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

864

674

"""

865

properties = {}

675

all = {}

866

676

for name, prop in self._get_all_dbus_properties():

867

677

if (interface_name

868

678

and interface_name != prop._dbus_interface):

873

683

continue

874

684

value = prop()

875

685

if not hasattr(value, "variant_level"):

876

properties[name] = value

686

all[name] = value

877

687

continue

878

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

879

value.variant_level+1)

880

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

688

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

689

value.variant_level+1)

690

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

881

691

882

692

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

883

693

out_signature="s",

927

737

return xmlstring

928

738

929

739

930

def datetime_to_dbus (dt, variant_level=0):

931

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

932

if dt is None:

933

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

934

return dbus.String(dt.isoformat(),

935

variant_level=variant_level)

936

937

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.

942

"""

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):

950

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

951

# with the wrong interface name

952

if (not hasattr(attribute, "_dbus_interface")

953

or not attribute._dbus_interface

954

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

955

continue

956

# Create an alternate D-Bus interface name based on

957

# the current name

958

alt_interface = (attribute._dbus_interface

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

961

# Is this a D-Bus signal?

962

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

963

# Extract the original non-method function by

964

# black magic

965

nonmethod_func = (dict(

966

zip(attribute.func_code.co_freevars,

967

attribute.__closure__))["func"]

968

.cell_contents)

969

# Create a new, but exactly alike, function

970

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

971

# with the alternate D-Bus interface name

972

new_function = (dbus.service.signal

973

(alt_interface,

974

attribute._dbus_signature)

975

(types.FunctionType(

976

nonmethod_func.func_code,

977

nonmethod_func.func_globals,

978

nonmethod_func.func_name,

979

nonmethod_func.func_defaults,

980

nonmethod_func.func_closure)))

981

# Define a creator of a function to call both the

982

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

983

# signals gets sent when the function is called

984

def fixscope(func1, func2):

985

"""This function is a scope container to pass

986

func1 and func2 to the "call_both" function

987

outside of its arguments"""

988

def call_both(*args, **kwargs):

989

"""This function will emit two D-Bus

990

signals by calling func1 and func2"""

991

func1(*args, **kwargs)

992

func2(*args, **kwargs)

993

return call_both

994

# Create the "call_both" function and add it to

995

# the class

996

attr[attrname] = fixscope(attribute,

997

new_function)

998

# Is this a D-Bus method?

999

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

1000

# Create a new, but exactly alike, function

1001

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

1002

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

1003

# to the class.

1004

attr[attrname] = (dbus.service.method

1005

(alt_interface,

1006

attribute._dbus_in_signature,

1007

attribute._dbus_out_signature)

1008

(types.FunctionType

1009

(attribute.func_code,

1010

attribute.func_globals,

1011

attribute.func_name,

1012

attribute.func_defaults,

1013

attribute.func_closure)))

1014

# Is this a D-Bus property?

1015

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

1016

# Create a new, but exactly alike, function

1017

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

1018

# property with the alternate D-Bus interface

1019

# name. Add it to the class.

1020

attr[attrname] = (dbus_service_property

1021

(alt_interface,

1022

attribute._dbus_signature,

1023

attribute._dbus_access,

1024

attribute

1025

._dbus_get_args_options

1026

["byte_arrays"])

1027

(types.FunctionType

1028

(attribute.func_code,

1029

attribute.func_globals,

1030

attribute.func_name,

1031

attribute.func_defaults,

1032

attribute.func_closure)))

1033

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

1034

1035

1036

740

class ClientDBus(Client, DBusObjectWithProperties):

1037

741

"""A Client class using D-Bus

1038

742

1047

751

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

1048

752

1049

753

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

754

self._approvals_pending = 0

1050

755

self.bus = bus

1051

756

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

1055

757

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

1056

758

# the D-Bus

1057

759

client_object_name = unicode(self.name).translate(

1062

764

DBusObjectWithProperties.__init__(self, self.bus,

1063

765

self.dbus_object_path)

1064

766

1065

def notifychangeproperty(transform_func,

1066

dbus_name, type_func=lambda x: x,

1067

variant_level=1):

1068

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

1069

its changes to DBus.

1070

1071

transform_fun: Function that takes a value and a variant_level

1072

and transforms it to a D-Bus type.

1073

dbus_name: D-Bus name of the variable

1074

type_func: Function that transform the value before sending it

1075

to the D-Bus. Default: no transform

1076

variant_level: D-Bus variant level. Default: 1

1077

"""

1078

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

1079

def setter(self, value):

1080

if hasattr(self, "dbus_object_path"):

1081

if (not hasattr(self, attrname) or

1082

type_func(getattr(self, attrname, None))

1083

!= type_func(value)):

1084

dbus_value = transform_func(type_func(value),

1085

variant_level

1086

=variant_level)

1087

self.PropertyChanged(dbus.String(dbus_name),

1088

dbus_value)

1089

setattr(self, attrname, value)

1090

1091

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

1092

1093

1094

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1095

approvals_pending = notifychangeproperty(dbus.Boolean,

1096

"ApprovalPending",

1097

type_func = bool)

1098

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

1099

last_enabled = notifychangeproperty(datetime_to_dbus,

1100

"LastEnabled")

1101

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

1102

type_func = lambda checker:

1103

checker is not None)

1104

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1105

"LastCheckedOK")

1106

last_approval_request = notifychangeproperty(

1107

datetime_to_dbus, "LastApprovalRequest")

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

1109

"ApprovedByDefault")

1110

approval_delay = notifychangeproperty(dbus.UInt64,

1111

"ApprovalDelay",

1112

type_func =

1113

timedelta_to_milliseconds)

1114

approval_duration = notifychangeproperty(

1115

dbus.UInt64, "ApprovalDuration",

1116

type_func = timedelta_to_milliseconds)

1117

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

1118

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

1119

type_func =

1120

timedelta_to_milliseconds)

1121

extended_timeout = notifychangeproperty(

1122

dbus.UInt64, "ExtendedTimeout",

1123

type_func = timedelta_to_milliseconds)

1124

interval = notifychangeproperty(dbus.UInt64,

1125

"Interval",

1126

type_func =

1127

timedelta_to_milliseconds)

1128

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

1129

1130

del notifychangeproperty

767

def _get_approvals_pending(self):

768

return self._approvals_pending

769

def _set_approvals_pending(self, value):

770

old_value = self._approvals_pending

771

self._approvals_pending = value

772

bval = bool(value)

773

if (hasattr(self, "dbus_object_path")

774

and bval is not bool(old_value)):

775

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

776

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

777

dbus_bool)

778

779

approvals_pending = property(_get_approvals_pending,

780

_set_approvals_pending)

781

del _get_approvals_pending, _set_approvals_pending

782

783

@staticmethod

784

def _datetime_to_dbus(dt, variant_level=0):

785

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

786

return dbus.String(dt.isoformat(),

787

variant_level=variant_level)

788

789

def enable(self):

790

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

791

r = Client.enable(self)

792

if oldstate != self.enabled:

793

# Emit D-Bus signals

794

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

795

dbus.Boolean(True, variant_level=1))

796

self.PropertyChanged(

797

dbus.String("LastEnabled"),

798

self._datetime_to_dbus(self.last_enabled,

799

variant_level=1))

800

return r

801

802

def disable(self, quiet = False):

803

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

804

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

805

if not quiet and oldstate != self.enabled:

806

# Emit D-Bus signal

807

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

808

dbus.Boolean(False, variant_level=1))

809

return r

1131

810

1132

811

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

1133

812

try:

1142

821

*args, **kwargs):

1143

822

self.checker_callback_tag = None

1144

823

self.checker = None

824

# Emit D-Bus signal

825

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

826

dbus.Boolean(False, variant_level=1))

1145

827

if os.WIFEXITED(condition):

1146

828

exitstatus = os.WEXITSTATUS(condition)

1147

829

# Emit D-Bus signal

1157

839

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

1158

840

*args, **kwargs)

1159

841

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastCheckedOK"),

847

(self._datetime_to_dbus(self.last_checked_ok,

848

variant_level=1)))

849

850

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

851

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

852

# Emit D-Bus signal

853

self.PropertyChanged(

854

dbus.String("LastApprovalRequest"),

855

(self._datetime_to_dbus(self.last_approval_request,

856

variant_level=1)))

857

return r

858

1160

859

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

1161

860

old_checker = self.checker

1162

861

if self.checker is not None:

1169

868

and old_checker_pid != self.checker.pid):

1170

869

# Emit D-Bus signal

1171

870

self.CheckerStarted(self.current_checker_command)

871

self.PropertyChanged(

872

dbus.String("CheckerRunning"),

873

dbus.Boolean(True, variant_level=1))

1172

874

return r

1173

875

876

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

877

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

878

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

879

if (old_checker is not None

880

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

881

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

882

dbus.Boolean(False, variant_level=1))

883

return r

884

1174

885

def _reset_approved(self):

1175

self.approved = None

886

self._approved = None

1176

887

return False

1177

888

1178

889

def approve(self, value=True):

1179

890

self.send_changedstate()

1180

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

891

self._approved = value

892

gobject.timeout_add(self._timedelta_to_milliseconds

1182

893

(self.approval_duration),

1183

894

self._reset_approved)

1184

895

1185

896

1186

897

## D-Bus methods, signals & properties

1187

_interface = "se.recompile.Mandos.Client"

898

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

1188

899

1189

900

## Signals

1190

901

1227

938

"D-Bus signal"

1228

939

return self.need_approval()

1229

940

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

1238

941

## Methods

1239

942

1240

943

# Approve - method

1284

987

if value is None: # get

1285

988

return dbus.Boolean(self.approved_by_default)

1286

989

self.approved_by_default = bool(value)

990

# Emit D-Bus signal

991

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

992

dbus.Boolean(value, variant_level=1))

1287

993

1288

994

# ApprovalDelay - property

1289

995

@dbus_service_property(_interface, signature="t",

1292

998

if value is None: # get

1293

999

return dbus.UInt64(self.approval_delay_milliseconds())

1294

1000

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

1001

# Emit D-Bus signal

1002

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

1003

dbus.UInt64(value, variant_level=1))

1295

1004

1296

1005

# ApprovalDuration - property

1297

1006

@dbus_service_property(_interface, signature="t",

1298

1007

access="readwrite")

1299

1008

def ApprovalDuration_dbus_property(self, value=None):

1300

1009

if value is None: # get

1301

return dbus.UInt64(timedelta_to_milliseconds(

1010

return dbus.UInt64(self._timedelta_to_milliseconds(

1302

1011

self.approval_duration))

1303

1012

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

1013

# Emit D-Bus signal

1014

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

1015

dbus.UInt64(value, variant_level=1))

1304

1016

1305

1017

# Name - property

1306

1018

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

1318

1030

def Host_dbus_property(self, value=None):

1319

1031

if value is None: # get

1320

1032

return dbus.String(self.host)

1321

self.host = unicode(value)

1033

self.host = value

1034

# Emit D-Bus signal

1035

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

1036

dbus.String(value, variant_level=1))

1322

1037

1323

1038

# Created - property

1324

1039

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

1325

1040

def Created_dbus_property(self):

1326

return datetime_to_dbus(self.created)

1041

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

1327

1042

1328

1043

# LastEnabled - property

1329

1044

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

1330

1045

def LastEnabled_dbus_property(self):

1331

return datetime_to_dbus(self.last_enabled)

1046

if self.last_enabled is None:

1047

return dbus.String("")

1048

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

1332

1049

1333

1050

# Enabled - property

1334

1051

@dbus_service_property(_interface, signature="b",

1348

1065

if value is not None:

1349

1066

self.checked_ok()

1350

1067

return

1351

return datetime_to_dbus(self.last_checked_ok)

1352

1353

# Expires - property

1354

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

1355

def Expires_dbus_property(self):

1356

return datetime_to_dbus(self.expires)

1068

if self.last_checked_ok is None:

1069

return dbus.String("")

1070

return dbus.String(self._datetime_to_dbus(self

1071

.last_checked_ok))

1357

1072

1358

1073

# LastApprovalRequest - property

1359

1074

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

1360

1075

def LastApprovalRequest_dbus_property(self):

1361

return datetime_to_dbus(self.last_approval_request)

1076

if self.last_approval_request is None:

1077

return dbus.String("")

1078

return dbus.String(self.

1079

_datetime_to_dbus(self

1080

.last_approval_request))

1362

1081

1363

1082

# Timeout - property

1364

1083

@dbus_service_property(_interface, signature="t",

1367

1086

if value is None: # get

1368

1087

return dbus.UInt64(self.timeout_milliseconds())

1369

1088

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

1089

# Emit D-Bus signal

1090

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

1091

dbus.UInt64(value, variant_level=1))

1092

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

1093

return

1370

1094

# Reschedule timeout

1371

if self.enabled:

1372

now = datetime.datetime.utcnow()

1373

time_to_die = timedelta_to_milliseconds(

1374

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

1375

if time_to_die <= 0:

1376

# The timeout has passed

1377

self.disable()

1378

else:

1379

self.expires = (now +

1380

datetime.timedelta(milliseconds =

1381

time_to_die))

1382

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

1383

is None):

1384

return

1385

gobject.source_remove(self.disable_initiator_tag)

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die,

1388

self.disable))

1389

1390

# ExtendedTimeout - property

1391

@dbus_service_property(_interface, signature="t",

1392

access="readwrite")

1393

def ExtendedTimeout_dbus_property(self, value=None):

1394

if value is None: # get

1395

return dbus.UInt64(self.extended_timeout_milliseconds())

1396

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

1095

gobject.source_remove(self.disable_initiator_tag)

1096

self.disable_initiator_tag = None

1097

time_to_die = (self.

1098

_timedelta_to_milliseconds((self

1099

.last_checked_ok

1100

+ self.timeout)

1101

- datetime.datetime

1102

.utcnow()))

1103

if time_to_die <= 0:

1104

# The timeout has passed

1105

self.disable()

1106

else:

1107

self.disable_initiator_tag = (gobject.timeout_add

1108

(time_to_die, self.disable))

1397

1109

1398

1110

# Interval - property

1399

1111

@dbus_service_property(_interface, signature="t",

1402

1114

if value is None: # get

1403

1115

return dbus.UInt64(self.interval_milliseconds())

1404

1116

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

1117

# Emit D-Bus signal

1118

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

1119

dbus.UInt64(value, variant_level=1))

1405

1120

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

1406

1121

return

1407

if self.enabled:

1408

# Reschedule checker run

1409

gobject.source_remove(self.checker_initiator_tag)

1410

self.checker_initiator_tag = (gobject.timeout_add

1411

(value, self.start_checker))

1412

self.start_checker() # Start one now, too

1413

1122

# Reschedule checker run

1123

gobject.source_remove(self.checker_initiator_tag)

1124

self.checker_initiator_tag = (gobject.timeout_add

1125

(value, self.start_checker))

1126

self.start_checker() # Start one now, too

1127

1414

1128

# Checker - property

1415

1129

@dbus_service_property(_interface, signature="s",

1416

1130

access="readwrite")

1417

1131

def Checker_dbus_property(self, value=None):

1418

1132

if value is None: # get

1419

1133

return dbus.String(self.checker_command)

1420

self.checker_command = unicode(value)

1134

self.checker_command = value

1135

# Emit D-Bus signal

1136

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

1137

dbus.String(self.checker_command,

1138

variant_level=1))

1421

1139

1422

1140

# CheckerRunning - property

1423

1141

@dbus_service_property(_interface, signature="b",

1450

1168

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

1451

1169

if not self._pipe.recv():

1452

1170

raise KeyError()

1453

1171

1454

1172

def __getattribute__(self, name):

1455

if name == '_pipe':

1173

if(name == '_pipe'):

1456

1174

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

1457

1175

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

1458

1176

data = self._pipe.recv()

1463

1181

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

1464

1182

return self._pipe.recv()[1]

1465

1183

return func

1466

1184

1467

1185

def __setattr__(self, name, value):

1468

if name == '_pipe':

1186

if(name == '_pipe'):

1469

1187

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

1470

1188

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

1471

1189

1472

1190

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1477

1191

class ClientHandler(socketserver.BaseRequestHandler, object):

1478

1192

"""A class to handle client connections.

1479

1193

1486

1200

unicode(self.client_address))

1487

1201

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

1488

1202

self.server.child_pipe.fileno())

1489

1203

1490

1204

session = (gnutls.connection

1491

1205

.ClientSession(self.request,

1492

1206

gnutls.connection

1493

1207

.X509Credentials()))

1494

1208

1495

1209

# Note: gnutls.connection.X509Credentials is really a

1496

1210

# generic GnuTLS certificate credentials object so long as

1497

1211

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

1498

1212

# here despite using OpenPGP certificates.

1499

1213

1500

1214

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

1501

1215

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

1502

1216

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

1508

1222

(gnutls.library.functions

1509

1223

.gnutls_priority_set_direct(session._c_object,

1510

1224

priority, None))

1511

1225

1512

1226

# Start communication using the Mandos protocol

1513

1227

# Get protocol number

1514

1228

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

1519

1233

except (ValueError, IndexError, RuntimeError) as error:

1520

1234

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

1521

1235

return

1522

1236

1523

1237

# Start GnuTLS connection

1524

1238

try:

1525

1239

session.handshake()

1529

1243

# established. Just abandon the request.

1530

1244

return

1531

1245

logger.debug("Handshake succeeded")

1532

1246

1533

1247

approval_required = False

1534

1248

try:

1535

1249

try:

1540

1254

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

1541

1255

return

1542

1256

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

1543

1257

1544

1258

try:

1545

1259

client = ProxyClient(child_pipe, fpr,

1546

1260

self.client_address)

1547

1261

except KeyError:

1548

1262

return

1549

1263

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1554

1264

if client.approval_delay:

1555

1265

delay = client.approval_delay

1556

1266

client.approvals_pending += 1

1562

1272

client.name)

1563

1273

if self.server.use_dbus:

1564

1274

# Emit D-Bus signal

1565

client.Rejected("Disabled")

1275

client.Rejected("Disabled")

1566

1276

return

1567

1277

1568

if client.approved or not client.approval_delay:

1278

if client._approved or not client.approval_delay:

1569

1279

#We are approved or approval is disabled

1570

1280

break

1571

elif client.approved is None:

1281

elif client._approved is None:

1572

1282

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

1573

1283

client.name)

1574

1284

if self.server.use_dbus:

1585

1295

return

1586

1296

1587

1297

#wait until timeout or approved

1298

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

1588

1299

time = datetime.datetime.now()

1589

1300

client.changedstate.acquire()

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1301

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

1593

1302

client.changedstate.release()

1594

1303

time2 = datetime.datetime.now()

1595

1304

if (time2 - time) >= delay:

1617

1326

sent, len(client.secret)

1618

1327

- (sent_size + sent))

1619

1328

sent_size += sent

1620

1329

1621

1330

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

1622

# bump the timeout using extended_timeout

1623

client.checked_ok(client.extended_timeout)

1331

# bump the timeout as if seen

1332

client.checked_ok()

1624

1333

if self.server.use_dbus:

1625

1334

# Emit D-Bus signal

1626

1335

client.GotSecret()

1693

1402

# Convert the buffer to a Python bytestring

1694

1403

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

1695

1404

# Convert the bytestring to hexadecimal notation

1696

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

1405

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

1697

1406

return hex_fpr

1698

1407

1699

1408

1702

1411

def sub_process_main(self, request, address):

1703

1412

try:

1704

1413

self.finish_request(request, address)

1705

except Exception:

1414

except:

1706

1415

self.handle_error(request, address)

1707

1416

self.close_request(request)

1708

1417

1709

1418

def process_request(self, request, address):

1710

1419

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

1711

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

1712

args = (request,

1713

address))

1714

proc.start()

1715

return proc

1716

1420

multiprocessing.Process(target = self.sub_process_main,

1421

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

1717

1422

1718

1423

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1719

1424

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

1723

1428

This function creates a new pipe in self.pipe

1724

1429

"""

1725

1430

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1726

1727

proc = MultiprocessingMixIn.process_request(self, request,

1728

client_address)

1431

1432

super(MultiprocessingMixInWithPipe,

1433

self).process_request(request, client_address)

1729

1434

self.child_pipe.close()

1730

self.add_pipe(parent_pipe, proc)

1731

1732

def add_pipe(self, parent_pipe, proc):

1435

self.add_pipe(parent_pipe)

1436

1437

def add_pipe(self, parent_pipe):

1733

1438

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

1734

1439

raise NotImplementedError

1735

1440

1736

1737

1441

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1738

1442

socketserver.TCPServer, object):

1739

1443

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

1813

1517

self.enabled = False

1814

1518

self.clients = clients

1815

1519

if self.clients is None:

1816

self.clients = {}

1520

self.clients = set()

1817

1521

self.use_dbus = use_dbus

1818

1522

self.gnutls_priority = gnutls_priority

1819

1523

IPv6_TCPServer.__init__(self, server_address,

1823

1527

def server_activate(self):

1824

1528

if self.enabled:

1825

1529

return socketserver.TCPServer.server_activate(self)

1826

1827

1530

def enable(self):

1828

1531

self.enabled = True

1829

1830

def add_pipe(self, parent_pipe, proc):

1532

def add_pipe(self, parent_pipe):

1831

1533

# Call "handle_ipc" for both data and EOF events

1832

1534

gobject.io_add_watch(parent_pipe.fileno(),

1833

1535

gobject.IO_IN | gobject.IO_HUP,

1834

1536

functools.partial(self.handle_ipc,

1835

parent_pipe =

1836

parent_pipe,

1837

proc = proc))

1838

1537

parent_pipe = parent_pipe))

1538

1839

1539

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

1840

proc = None, client_object=None):

1540

client_object=None):

1841

1541

condition_names = {

1842

1542

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

1843

1543

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

1852

1552

for cond, name in

1853

1553

condition_names.iteritems()

1854

1554

if cond & condition)

1855

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

1555

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

1856

1556

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

1857

# Wait for other process to exit

1858

proc.join()

1859

1557

return False

1860

1558

1861

1559

# Read a request from the child

1866

1564

fpr = request[1]

1867

1565

address = request[2]

1868

1566

1869

for c in self.clients.itervalues():

1567

for c in self.clients:

1870

1568

if c.fingerprint == fpr:

1871

1569

client = c

1872

1570

break

1875

1573

"dress: %s", fpr, address)

1876

1574

if self.use_dbus:

1877

1575

# Emit D-Bus signal

1878

mandos_dbus_service.ClientNotFound(fpr,

1879

address[0])

1576

mandos_dbus_service.ClientNotFound(fpr, address[0])

1880

1577

parent_pipe.send(False)

1881

1578

return False

1882

1579

1883

1580

gobject.io_add_watch(parent_pipe.fileno(),

1884

1581

gobject.IO_IN | gobject.IO_HUP,

1885

1582

functools.partial(self.handle_ipc,

1886

parent_pipe =

1887

parent_pipe,

1888

proc = proc,

1889

client_object =

1890

client))

1583

parent_pipe = parent_pipe,

1584

client_object = client))

1891

1585

parent_pipe.send(True)

1892

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

1893

# same fileno

1586

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

1894

1587

return False

1895

1588

if command == 'funcall':

1896

1589

funcname = request[1]

1897

1590

args = request[2]

1898

1591

kwargs = request[3]

1899

1592

1900

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

1901

funcname)(*args,

1902

**kwargs)))

1903

1593

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

1594

1904

1595

if command == 'getattr':

1905

1596

attrname = request[1]

1906

1597

if callable(client_object.__getattribute__(attrname)):

1907

1598

parent_pipe.send(('function',))

1908

1599

else:

1909

parent_pipe.send(('data', client_object

1910

.__getattribute__(attrname)))

1600

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

1911

1601

1912

1602

if command == 'setattr':

1913

1603

attrname = request[1]

1914

1604

value = request[2]

1915

1605

setattr(client_object, attrname, value)

1916

1606

1917

1607

return True

1918

1608

1919

1609

1956

1646

return timevalue

1957

1647

1958

1648

1649

def if_nametoindex(interface):

1650

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

1651

1652

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

1653

global if_nametoindex

1654

try:

1655

if_nametoindex = (ctypes.cdll.LoadLibrary

1656

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

1657

.if_nametoindex)

1658

except (OSError, AttributeError):

1659

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

1660

def if_nametoindex(interface):

1661

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

1662

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

1663

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

1664

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1665

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

1666

interface))

1667

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

1668

ifreq[16:20])[0]

1669

return interface_index

1670

return if_nametoindex(interface)

1671

1672

1959

1673

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

1960

1674

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

1961

1675

2016

1730

" system bus interface")

2017

1731

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

2018

1732

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

2019

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

2020

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

2021

" state")

2022

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

2023

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

2024

2025

1733

options = parser.parse_args()

2026

1734

2027

1735

if options.check:

2040

1748

"use_dbus": "True",

2041

1749

"use_ipv6": "True",

2042

1750

"debuglevel": "",

2043

"restore": "True",

2044

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

2045

1751

}

2046

1752

2047

1753

# Parse config file for server-global settings

2064

1770

# options, if set.

2065

1771

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

2066

1772

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

2067

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

2068

"statedir"):

1773

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

2069

1774

value = getattr(options, option)

2070

1775

if value is not None:

2071

1776

server_settings[option] = value

2083

1788

debuglevel = server_settings["debuglevel"]

2084

1789

use_dbus = server_settings["use_dbus"]

2085

1790

use_ipv6 = server_settings["use_ipv6"]

2086

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

2087

stored_state_file)

2088

2089

if debug:

2090

initlogger(debug, logging.DEBUG)

2091

else:

2092

if not debuglevel:

2093

initlogger(debug)

2094

else:

2095

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

2096

initlogger(debug, level)

2097

1791

2098

1792

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

2099

1793

syslogger.setFormatter(logging.Formatter

2100

1794

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

2102

1796

% server_settings["servicename"]))

2103

1797

2104

1798

# Parse config file with clients

2105

client_config = configparser.SafeConfigParser(Client

2106

.client_defaults)

1799

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

1800

"interval": "5m",

1801

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

1802

"host": "",

1803

"approval_delay": "0s",

1804

"approval_duration": "1s",

1805

}

1806

client_config = configparser.SafeConfigParser(client_defaults)

2107

1807

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

2108

1808

"clients.conf"))

2109

1809

2147

1847

if error[0] != errno.EPERM:

2148

1848

raise error

2149

1849

1850

if not debug and not debuglevel:

1851

syslogger.setLevel(logging.WARNING)

1852

console.setLevel(logging.WARNING)

1853

if debuglevel:

1854

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

1855

syslogger.setLevel(level)

1856

console.setLevel(level)

1857

2150

1858

if debug:

2151

1859

# Enable all possible GnuTLS debugging

2152

1860

2166

1874

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

2167

1875

if null > 2:

2168

1876

os.close(null)

1877

else:

1878

# No console logging

1879

logger.removeHandler(console)

2169

1880

2170

1881

# Need to fork before connecting to D-Bus

2171

1882

if not debug:

2172

1883

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

2173

1884

daemon()

2174

1885

2175

gobject.threads_init()

2176

2177

1886

global main_loop

2178

1887

# From the Avahi example code

2179

1888

DBusGMainLoop(set_as_default=True )

2182

1891

# End of Avahi example code

2183

1892

if use_dbus:

2184

1893

try:

2185

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

1894

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

2186

1895

bus, do_not_queue=True)

2187

old_bus_name = (dbus.service.BusName

2188

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

2189

do_not_queue=True))

2190

1896

except dbus.exceptions.NameExistsException as e:

2191

1897

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

2192

1898

use_dbus = False

2193

1899

server_settings["use_dbus"] = False

2194

1900

tcp_server.use_dbus = False

2195

1901

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2196

service = AvahiServiceToSyslog(name =

2197

server_settings["servicename"],

2198

servicetype = "_mandos._tcp",

2199

protocol = protocol, bus = bus)

1902

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

1903

servicetype = "_mandos._tcp",

1904

protocol = protocol, bus = bus)

2200

1905

if server_settings["interface"]:

2201

1906

service.interface = (if_nametoindex

2202

1907

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

2206

1911

2207

1912

client_class = Client

2208

1913

if use_dbus:

2209

client_class = functools.partial(ClientDBusTransitional,

2210

bus = bus)

2211

2212

client_settings = Client.config_parser(client_config)

2213

old_client_settings = {}

2214

clients_data = {}

2215

2216

# Get client data and settings from last running state.

2217

if server_settings["restore"]:

2218

try:

2219

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

2220

clients_data, old_client_settings = (pickle.load

2221

(stored_state))

2222

os.remove(stored_state_path)

2223

except IOError as e:

2224

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

2225

.format(e))

2226

if e.errno != errno.ENOENT:

2227

raise

2228

except EOFError as e:

2229

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

2230

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

2231

2232

with PGPEngine() as pgp:

2233

for client_name, client in clients_data.iteritems():

2234

# Decide which value to use after restoring saved state.

2235

# We have three different values: Old config file,

2236

# new config file, and saved state.

2237

# New config value takes precedence if it differs from old

2238

# config value, otherwise use saved state.

2239

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

2240

try:

2241

# For each value in new config, check if it

2242

# differs from the old config value (Except for

2243

# the "secret" attribute)

2244

if (name != "secret" and

2245

value != old_client_settings[client_name]

2246

[name]):

2247

client[name] = value

2248

except KeyError:

2249

pass

2250

2251

# Clients who has passed its expire date can still be

2252

# enabled if its last checker was successful. Clients

2253

# whose checker failed before we stored its state is

2254

# assumed to have failed all checkers during downtime.

2255

if client["enabled"]:

2256

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

2257

if not client["last_checked_ok"]:

2258

logger.warning(

2259

"disabling client {0} - Client never "

2260

"performed a successfull checker"

2261

.format(client["name"]))

2262

client["enabled"] = False

2263

elif client["last_checker_status"] != 0:

2264

logger.warning(

2265

"disabling client {0} - Client "

2266

"last checker failed with error code {1}"

2267

.format(client["name"],

2268

client["last_checker_status"]))

2269

client["enabled"] = False

2270

else:

2271

client["expires"] = (datetime.datetime

2272

.utcnow()

2273

+ client["timeout"])

2274

logger.debug("Last checker succeeded,"

2275

" keeping {0} enabled"

2276

.format(client["name"]))

1914

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

1915

def client_config_items(config, section):

1916

special_settings = {

1917

"approved_by_default":

1918

lambda: config.getboolean(section,

1919

"approved_by_default"),

1920

}

1921

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

2277

1922

try:

2278

client["secret"] = (

2279

pgp.decrypt(client["encrypted_secret"],

2280

client_settings[client_name]

2281

["secret"]))

2282

except PGPError:

2283

# If decryption fails, we use secret from new settings

2284

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

2285

.format(client_name))

2286

client["secret"] = (

2287

client_settings[client_name]["secret"])

2288

2289

2290

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

2291

for client_name in (set(old_client_settings)

2292

- set(client_settings)):

2293

del clients_data[client_name]

2294

for client_name in (set(client_settings)

2295

- set(old_client_settings)):

2296

clients_data[client_name] = client_settings[client_name]

2297

2298

# Create clients all clients

2299

for client_name, client in clients_data.iteritems():

2300

tcp_server.clients[client_name] = client_class(

2301

name = client_name, settings = client)

2302

1923

yield (name, special_settings[name]())

1924

except KeyError:

1925

yield (name, value)

1926

1927

tcp_server.clients.update(set(

1928

client_class(name = section,

1929

config= dict(client_config_items(

1930

client_config, section)))

1931

for section in client_config.sections()))

2303

1932

if not tcp_server.clients:

2304

1933

logger.warning("No clients defined")

2305

1934

2316

1945

# "pidfile" was never created

2317

1946

pass

2318

1947

del pidfilename

1948

2319

1949

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

2320

1950

2321

1951

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

2322

1952

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

2323

1953

2326

1956

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

2327

1957

def __init__(self):

2328

1958

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

2329

_interface = "se.recompile.Mandos"

1959

_interface = "se.bsnet.fukt.Mandos"

2330

1960

2331

1961

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

2332

1962

def ClientAdded(self, objpath):

2347

1977

def GetAllClients(self):

2348

1978

"D-Bus method"

2349

1979

return dbus.Array(c.dbus_object_path

2350

for c in

2351

tcp_server.clients.itervalues())

1980

for c in tcp_server.clients)

2352

1981

2353

1982

@dbus.service.method(_interface,

2354

1983

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

2356

1985

"D-Bus method"

2357

1986

return dbus.Dictionary(

2358

1987

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

2359

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

1988

for c in tcp_server.clients),

2360

1989

signature="oa{sv}")

2361

1990

2362

1991

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

2363

1992

def RemoveClient(self, object_path):

2364

1993

"D-Bus method"

2365

for c in tcp_server.clients.itervalues():

1994

for c in tcp_server.clients:

2366

1995

if c.dbus_object_path == object_path:

2367

del tcp_server.clients[c.name]

1996

tcp_server.clients.remove(c)

2368

1997

c.remove_from_connection()

2369

1998

# Don't signal anything except ClientRemoved

2370

1999

c.disable(quiet=True)

2375

2004

2376

2005

del _interface

2377

2006

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

2007

mandos_dbus_service = MandosDBusService()

2381

2008

2382

2009

def cleanup():

2383

2010

"Cleanup function; run on exit"

2384

2011

service.cleanup()

2385

2012

2386

multiprocessing.active_children()

2387

if not (tcp_server.clients or client_settings):

2388

return

2389

2390

# Store client before exiting. Secrets are encrypted with key

2391

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

2392

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

2393

clients = {}

2394

with PGPEngine() as pgp:

2395

for client in tcp_server.clients.itervalues():

2396

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

2397

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

2398

key)

2399

client_dict = {}

2400

2401

# A list of attributes that can not be pickled

2402

# + secret.

2403

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

2404

"checker"))

2405

for name, typ in (inspect.getmembers

2406

(dbus.service.Object)):

2407

exclude.add(name)

2408

2409

client_dict["encrypted_secret"] = (client

2410

.encrypted_secret)

2411

for attr in client.client_structure:

2412

if attr not in exclude:

2413

client_dict[attr] = getattr(client, attr)

2414

2415

clients[client.name] = client_dict

2416

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

2417

2418

try:

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:

2424

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

2425

os.rename(tempname, stored_state_path)

2426

except (IOError, OSError) as e:

2427

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

2428

.format(e))

2429

if not debug:

2430

try:

2431

os.remove(tempname)

2432

except NameError:

2433

pass

2434

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

2435

errno.EEXIST)):

2436

raise e

2437

2438

# Delete all clients, and settings from config

2439

2013

while tcp_server.clients:

2440

name, client = tcp_server.clients.popitem()

2014

client = tcp_server.clients.pop()

2441

2015

if use_dbus:

2442

2016

client.remove_from_connection()

2017

client.disable_hook = None

2443

2018

# Don't signal anything except ClientRemoved

2444

2019

client.disable(quiet=True)

2445

2020

if use_dbus:

2446

2021

# Emit D-Bus signal

2447

mandos_dbus_service.ClientRemoved(client

2448

.dbus_object_path,

2022

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2449

2023

client.name)

2450

client_settings.clear()

2451

2024

2452

2025

atexit.register(cleanup)

2453

2026

2454

for client in tcp_server.clients.itervalues():

2027

for client in tcp_server.clients:

2455

2028

if use_dbus:

2456

2029

# Emit D-Bus signal

2457

2030

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2458

# Need to initiate checking of clients

2459

if client.enabled:

2460

client.init_checker()

2031

client.enable()

2461

2032

2462

2033

tcp_server.enable()

2463

2034

tcp_server.server_activate()