/mandos/release : revision 292

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

63

import cPickle as pickle

64

import multiprocessing

65

import types

66

import binascii

67

import tempfile

66

68

67

69

import dbus

68

70

import dbus.service

73

75

import ctypes.util

74

76

import xml.dom.minidom

75

77

import inspect

78

import GnuPGInterface

76

79

77

80

try:

78

81

SO_BINDTODEVICE = socket.SO_BINDTODEVICE

82

85

except ImportError:

83

86

SO_BINDTODEVICE = None

84

87

85

86

version = "1.4.1"

87

88

#logger = logging.getLogger('mandos')

89

logger = logging.Logger('mandos')

88

version = "1.5.0"

89

stored_state_file = "clients.pickle"

90

91

logger = logging.getLogger()

90

92

syslogger = (logging.handlers.SysLogHandler

91

93

(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

92

94

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

93

syslogger.setFormatter(logging.Formatter

94

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

95

' %(message)s'))

96

logger.addHandler(syslogger)

97

98

console = logging.StreamHandler()

99

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

100

' %(levelname)s:'

101

' %(message)s'))

102

logger.addHandler(console)

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

103

211

104

212

class AvahiError(Exception):

105

213

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

164

272

.GetAlternativeServiceName(self.name))

165

273

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

166

274

self.name)

167

syslogger.setFormatter(logging.Formatter

168

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

169

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

170

% self.name))

171

275

self.remove()

172

276

try:

173

277

self.add()

193

297

avahi.DBUS_INTERFACE_ENTRY_GROUP)

194

298

self.entry_group_state_changed_match = (

195

299

self.group.connect_to_signal(

196

'StateChanged', self .entry_group_state_changed))

300

'StateChanged', self.entry_group_state_changed))

197

301

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

198

302

self.name, self.type)

199

303

self.group.AddService(

225

329

try:

226

330

self.group.Free()

227

331

except (dbus.exceptions.UnknownMethodException,

228

dbus.exceptions.DBusException) as e:

332

dbus.exceptions.DBusException):

229

333

pass

230

334

self.group = None

231

335

self.remove()

265

369

self.server_state_changed)

266

370

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

267

371

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

268

381

269

def _timedelta_to_milliseconds(td):

382

def timedelta_to_milliseconds(td):

270

383

"Convert a datetime.timedelta() to milliseconds"

271

384

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

272

385

+ (td.seconds * 1000)

276

389

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

277

390

278

391

Attributes:

279

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

392

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

280

393

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

281

394

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

282

395

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

289

402

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

290

403

checker_initiator_tag: a gobject event source tag, or None

291

404

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

292

407

current_checker_command: string; current running checker_command

293

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

294

408

disable_initiator_tag: a gobject event source tag, or None

295

409

enabled: bool()

296

410

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

299

413

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

300

414

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

301

415

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

302

last_enabled: datetime.datetime(); (UTC)

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

303

420

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

304

421

D-Bus identifiers

305

422

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

315

432

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

316

433

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

317

434

"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

}

318

445

319

446

def timeout_milliseconds(self):

320

447

"Return the 'timeout' attribute in milliseconds"

321

return _timedelta_to_milliseconds(self.timeout)

448

return timedelta_to_milliseconds(self.timeout)

322

449

323

450

def extended_timeout_milliseconds(self):

324

451

"Return the 'extended_timeout' attribute in milliseconds"

325

return _timedelta_to_milliseconds(self.extended_timeout)

452

return timedelta_to_milliseconds(self.extended_timeout)

326

453

327

454

def interval_milliseconds(self):

328

455

"Return the 'interval' attribute in milliseconds"

329

return _timedelta_to_milliseconds(self.interval)

456

return timedelta_to_milliseconds(self.interval)

330

457

331

458

def approval_delay_milliseconds(self):

332

return _timedelta_to_milliseconds(self.approval_delay)

333

334

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

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):

335

510

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

336

511

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

337

512

attribute."""

338

513

self.name = name

339

if config is None:

340

config = {}

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

341

528

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

342

529

# Uppercase and remove spaces from fingerprint for later

343

530

# comparison purposes with return value from the fingerprint()

344

531

# function

345

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

346

.replace(" ", ""))

347

532

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

348

if "secret" in config:

349

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

350

elif "secfile" in config:

351

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

352

(config["secfile"])),

353

"rb") as secfile:

354

self.secret = secfile.read()

355

else:

356

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

357

% self.name)

358

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

359

self.created = datetime.datetime.utcnow()

360

self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

364

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

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

533

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

534

datetime.datetime.utcnow())

535

536

# attributes specific for this server instance

369

537

self.checker = None

370

538

self.checker_initiator_tag = None

371

539

self.disable_initiator_tag = None

372

self.expires = None

373

540

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

375

541

self.current_checker_command = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

542

self.approved = None

380

543

self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

384

config["approval_duration"])

385

544

self.changedstate = (multiprocessing_manager

386

545

.Condition(multiprocessing_manager

387

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)

388

558

559

# Send notice to process children that client state has changed

389

560

def send_changedstate(self):

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

561

with self.changedstate:

562

self.changedstate.notify_all()

393

563

394

564

def enable(self):

395

565

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

397

567

# Already enabled

398

568

return

399

569

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

404

self.start_checker))

405

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

406

570

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

410

571

self.enabled = True

411

572

self.last_enabled = datetime.datetime.utcnow()

412

# Also start a new checker *right now*.

413

self.start_checker()

573

self.init_checker()

414

574

415

575

def disable(self, quiet=True):

416

576

"""Disable this client."""

428

588

gobject.source_remove(self.checker_initiator_tag)

429

589

self.checker_initiator_tag = None

430

590

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

591

self.enabled = False

434

592

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

435

593

return False

436

594

437

595

def __del__(self):

438

self.disable_hook = None

439

596

self.disable()

440

597

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

441

611

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

442

612

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

443

613

self.checker_callback_tag = None

444

614

self.checker = None

445

615

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

448

618

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

449

619

vars(self))

450

620

self.checked_ok()

452

622

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

453

623

vars(self))

454

624

else:

625

self.last_checker_status = -1

455

626

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

456

627

vars(self))

457

628

468

639

gobject.source_remove(self.disable_initiator_tag)

469

640

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

470

641

self.disable_initiator_tag = (gobject.timeout_add

471

(_timedelta_to_milliseconds

642

(timedelta_to_milliseconds

472

643

(timeout), self.disable))

473

644

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

474

645

679

850

# signatures other than "ay".

680

851

if prop._dbus_signature != "ay":

681

852

raise ValueError

682

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

683

for byte in value))

853

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

854

for byte in value))

684

855

prop(value)

685

856

686

857

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

691

862

692

863

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

693

864

"""

694

all = {}

865

properties = {}

695

866

for name, prop in self._get_all_dbus_properties():

696

867

if (interface_name

697

868

and interface_name != prop._dbus_interface):

702

873

continue

703

874

value = prop()

704

875

if not hasattr(value, "variant_level"):

705

all[name] = value

876

properties[name] = value

706

877

continue

707

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

708

value.variant_level+1)

709

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

878

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

879

value.variant_level+1)

880

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

710

881

711

882

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

712

883

out_signature="s",

763

934

return dbus.String(dt.isoformat(),

764

935

variant_level=variant_level)

765

936

937

766

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

939

.__metaclass__):

768

940

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

860

1032

attribute.func_closure)))

861

1033

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

862

1034

1035

863

1036

class ClientDBus(Client, DBusObjectWithProperties):

864

1037

"""A Client class using D-Bus

865

1038

874

1047

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

875

1048

876

1049

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

877

self._approvals_pending = 0

878

1050

self.bus = bus

879

1051

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

880

1055

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

881

1056

# the D-Bus

882

1057

client_object_name = unicode(self.name).translate(

892

1067

variant_level=1):

893

1068

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

894

1069

its changes to DBus.

895

1070

896

1071

transform_fun: Function that takes a value and a variant_level

897

1072

and transforms it to a D-Bus type.

898

1073

dbus_name: D-Bus name of the variable

932

1107

datetime_to_dbus, "LastApprovalRequest")

933

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

934

1109

"ApprovedByDefault")

935

approval_delay = notifychangeproperty(dbus.UInt16,

1110

approval_delay = notifychangeproperty(dbus.UInt64,

936

1111

"ApprovalDelay",

937

1112

type_func =

938

_timedelta_to_milliseconds)

1113

timedelta_to_milliseconds)

939

1114

approval_duration = notifychangeproperty(

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1115

dbus.UInt64, "ApprovalDuration",

1116

type_func = timedelta_to_milliseconds)

942

1117

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

943

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

1118

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

944

1119

type_func =

945

_timedelta_to_milliseconds)

1120

timedelta_to_milliseconds)

946

1121

extended_timeout = notifychangeproperty(

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1122

dbus.UInt64, "ExtendedTimeout",

1123

type_func = timedelta_to_milliseconds)

1124

interval = notifychangeproperty(dbus.UInt64,

950

1125

"Interval",

951

1126

type_func =

952

_timedelta_to_milliseconds)

1127

timedelta_to_milliseconds)

953

1128

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

954

1129

955

1130

del notifychangeproperty

997

1172

return r

998

1173

999

1174

def _reset_approved(self):

1000

self._approved = None

1175

self.approved = None

1001

1176

return False

1002

1177

1003

1178

def approve(self, value=True):

1004

1179

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1180

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

1007

1182

(self.approval_duration),

1008

1183

self._reset_approved)

1009

1184

1052

1227

"D-Bus signal"

1053

1228

return self.need_approval()

1054

1229

1230

# NeRwequest - signal

1231

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

1232

def NewRequest(self, ip):

1233

"""D-Bus signal

1234

Is sent after a client request a password.

1235

"""

1236

pass

1237

1055

1238

## Methods

1056

1239

1057

1240

# Approve - method

1115

1298

access="readwrite")

1116

1299

def ApprovalDuration_dbus_property(self, value=None):

1117

1300

if value is None: # get

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1301

return dbus.UInt64(timedelta_to_milliseconds(

1119

1302

self.approval_duration))

1120

1303

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

1121

1304

1135

1318

def Host_dbus_property(self, value=None):

1136

1319

if value is None: # get

1137

1320

return dbus.String(self.host)

1138

self.host = value

1321

self.host = unicode(value)

1139

1322

1140

1323

# Created - property

1141

1324

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

1142

1325

def Created_dbus_property(self):

1143

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

1326

return datetime_to_dbus(self.created)

1144

1327

1145

1328

# LastEnabled - property

1146

1329

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

1184

1367

if value is None: # get

1185

1368

return dbus.UInt64(self.timeout_milliseconds())

1186

1369

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

1187

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

1188

return

1189

1370

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

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))

1207

1389

1208

1390

# ExtendedTimeout - property

1209

1391

@dbus_service_property(_interface, signature="t",

1222

1404

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

1223

1405

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

1224

1406

return

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

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

1230

1413

1231

1414

# Checker - property

1232

1415

@dbus_service_property(_interface, signature="s",

1234

1417

def Checker_dbus_property(self, value=None):

1235

1418

if value is None: # get

1236

1419

return dbus.String(self.checker_command)

1237

self.checker_command = value

1420

self.checker_command = unicode(value)

1238

1421

1239

1422

# CheckerRunning - property

1240

1423

@dbus_service_property(_interface, signature="b",

1269

1452

raise KeyError()

1270

1453

1271

1454

def __getattribute__(self, name):

1272

if(name == '_pipe'):

1455

if name == '_pipe':

1273

1456

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

1274

1457

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

1275

1458

data = self._pipe.recv()

1282

1465

return func

1283

1466

1284

1467

def __setattr__(self, name, value):

1285

if(name == '_pipe'):

1468

if name == '_pipe':

1286

1469

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

1287

1470

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

1288

1471

1472

1289

1473

class ClientDBusTransitional(ClientDBus):

1290

1474

__metaclass__ = AlternateDBusNamesMetaclass

1291

1475

1476

1292

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1293

1478

"""A class to handle client connections.

1294

1479

1362

1547

except KeyError:

1363

1548

return

1364

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1365

1554

if client.approval_delay:

1366

1555

delay = client.approval_delay

1367

1556

client.approvals_pending += 1

1376

1565

client.Rejected("Disabled")

1377

1566

return

1378

1567

1379

if client._approved or not client.approval_delay:

1568

if client.approved or not client.approval_delay:

1380

1569

#We are approved or approval is disabled

1381

1570

break

1382

elif client._approved is None:

1571

elif client.approved is None:

1383

1572

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

1384

1573

client.name)

1385

1574

if self.server.use_dbus:

1399

1588

time = datetime.datetime.now()

1400

1589

client.changedstate.acquire()

1401

1590

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1591

(float(client.timedelta_to_milliseconds(delay)

1403

1592

/ 1000)))

1404

1593

client.changedstate.release()

1405

1594

time2 = datetime.datetime.now()

1504

1693

# Convert the buffer to a Python bytestring

1505

1694

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

1506

1695

# Convert the bytestring to hexadecimal notation

1507

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

1696

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

1508

1697

return hex_fpr

1509

1698

1510

1699

1513

1702

def sub_process_main(self, request, address):

1514

1703

try:

1515

1704

self.finish_request(request, address)

1516

except:

1705

except Exception:

1517

1706

self.handle_error(request, address)

1518

1707

self.close_request(request)

1519

1708

1624

1813

self.enabled = False

1625

1814

self.clients = clients

1626

1815

if self.clients is None:

1627

self.clients = set()

1816

self.clients = {}

1628

1817

self.use_dbus = use_dbus

1629

1818

self.gnutls_priority = gnutls_priority

1630

1819

IPv6_TCPServer.__init__(self, server_address,

1677

1866

fpr = request[1]

1678

1867

address = request[2]

1679

1868

1680

for c in self.clients:

1869

for c in self.clients.itervalues():

1681

1870

if c.fingerprint == fpr:

1682

1871

client = c

1683

1872

break

1767

1956

return timevalue

1768

1957

1769

1958

1770

def if_nametoindex(interface):

1771

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

1772

1773

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

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

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

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

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

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

1794

1959

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

1795

1960

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

1796

1961

1851

2016

" system bus interface")

1852

2017

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

1853

2018

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

1854

2025

options = parser.parse_args()

1855

2026

1856

2027

if options.check:

1869

2040

"use_dbus": "True",

1870

2041

"use_ipv6": "True",

1871

2042

"debuglevel": "",

2043

"restore": "True",

2044

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

1872

2045

}

1873

2046

1874

2047

# Parse config file for server-global settings

1891

2064

# options, if set.

1892

2065

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

1893

2066

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

1894

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

2067

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

2068

"statedir"):

1895

2069

value = getattr(options, option)

1896

2070

if value is not None:

1897

2071

server_settings[option] = value

1909

2083

debuglevel = server_settings["debuglevel"]

1910

2084

use_dbus = server_settings["use_dbus"]

1911

2085

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)

1912

2097

1913

2098

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

1914

2099

syslogger.setFormatter(logging.Formatter

1917

2102

% server_settings["servicename"]))

1918

2103

1919

2104

# Parse config file with clients

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2105

client_config = configparser.SafeConfigParser(Client

2106

.client_defaults)

1929

2107

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

1930

2108

"clients.conf"))

1931

2109

1969

2147

if error[0] != errno.EPERM:

1970

2148

raise error

1971

2149

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

1979

1980

2150

if debug:

1981

2151

# Enable all possible GnuTLS debugging

1982

2152

1996

2166

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

1997

2167

if null > 2:

1998

2168

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2002

2169

2003

2170

# Need to fork before connecting to D-Bus

2004

2171

if not debug:

2005

2172

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

2006

2173

daemon()

2007

2174

2175

gobject.threads_init()

2176

2008

2177

global main_loop

2009

2178

# From the Avahi example code

2010

2179

DBusGMainLoop(set_as_default=True )

2024

2193

server_settings["use_dbus"] = False

2025

2194

tcp_server.use_dbus = False

2026

2195

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2196

service = AvahiServiceToSyslog(name =

2197

server_settings["servicename"],

2198

servicetype = "_mandos._tcp",

2199

protocol = protocol, bus = bus)

2030

2200

if server_settings["interface"]:

2031

2201

service.interface = (if_nametoindex

2032

2202

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

2038

2208

if use_dbus:

2039

2209

client_class = functools.partial(ClientDBusTransitional,

2040

2210

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

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

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"]))

2048

2277

try:

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

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

2058

2303

if not tcp_server.clients:

2059

2304

logger.warning("No clients defined")

2060

2305

2071

2316

# "pidfile" was never created

2072

2317

pass

2073

2318

del pidfilename

2074

2075

2319

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

2076

2320

2077

2321

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

2103

2347

def GetAllClients(self):

2104

2348

"D-Bus method"

2105

2349

return dbus.Array(c.dbus_object_path

2106

for c in tcp_server.clients)

2350

for c in

2351

tcp_server.clients.itervalues())

2107

2352

2108

2353

@dbus.service.method(_interface,

2109

2354

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

2111

2356

"D-Bus method"

2112

2357

return dbus.Dictionary(

2113

2358

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

2114

for c in tcp_server.clients),

2359

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

2115

2360

signature="oa{sv}")

2116

2361

2117

2362

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

2118

2363

def RemoveClient(self, object_path):

2119

2364

"D-Bus method"

2120

for c in tcp_server.clients:

2365

for c in tcp_server.clients.itervalues():

2121

2366

if c.dbus_object_path == object_path:

2122

tcp_server.clients.remove(c)

2367

del tcp_server.clients[c.name]

2123

2368

c.remove_from_connection()

2124

2369

# Don't signal anything except ClientRemoved

2125

2370

c.disable(quiet=True)

2139

2384

service.cleanup()

2140

2385

2141

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

2142

2439

while tcp_server.clients:

2143

client = tcp_server.clients.pop()

2440

name, client = tcp_server.clients.popitem()

2144

2441

if use_dbus:

2145

2442

client.remove_from_connection()

2146

client.disable_hook = None

2147

2443

# Don't signal anything except ClientRemoved

2148

2444

client.disable(quiet=True)

2149

2445

if use_dbus:

2151

2447

mandos_dbus_service.ClientRemoved(client

2152

2448

.dbus_object_path,

2153

2449

client.name)

2450

client_settings.clear()

2154

2451

2155

2452

atexit.register(cleanup)

2156

2453

2157

for client in tcp_server.clients:

2454

for client in tcp_server.clients.itervalues():

2158

2455

if use_dbus:

2159

2456

# Emit D-Bus signal

2160

2457

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2161

client.enable()

2458

# Need to initiate checking of clients

2459

if client.enabled:

2460

client.init_checker()

2162

2461

2163

2462

tcp_server.enable()

2164

2463

tcp_server.server_activate()

2204

2503

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

2205

2504

cleanup()

2206

2505

2207

2208

2506

if __name__ == '__main__':

2209

2507

main()