/mandos/release : revision 237.11.13

63

import cPickle as pickle

64

import multiprocessing

65

import types

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import binascii

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import tempfile

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.4.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

99

.if_nametoindex)

100

except (OSError, AttributeError):

101

def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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112

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def initlogger(level=logging.WARNING):

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet'])

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

190

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def decrypt(self, data, password):

192

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

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with open(os.devnull) as devnull:

194

try:

195

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

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

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attach_fhs={'stderr': devnull})

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

199

f.write(data)

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

201

decrypted_plaintext = f.read()

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proc.wait()

203

except IOError as e:

204

raise PGPError(e)

205

self.gnupg.passphrase = None

206

return decrypted_plaintext

207

208

93

syslogger.setFormatter(logging.Formatter

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

95

' %(message)s'))

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logger.addHandler(syslogger)

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98

console = logging.StreamHandler()

99

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

211

105

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

270

164

.GetAlternativeServiceName(self.name))

271

165

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

295

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

296

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self.entry_group_state_changed_match = (

297

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self.group.connect_to_signal(

298

'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

299

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

300

198

self.name, self.type)

301

199

self.group.AddService(

327

225

try:

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self.group.Free()

329

227

except (dbus.exceptions.UnknownMethodException,

330

dbus.exceptions.DBusException):

228

dbus.exceptions.DBusException) as e:

331

229

pass

332

230

self.group = None

333

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self.remove()

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265

self.server_state_changed)

368

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

369

267

370

class AvahiServiceToSyslog(AvahiService):

371

def rename(self):

372

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

373

ret = AvahiService.rename(self)

374

syslogger.setFormatter(logging.Formatter

375

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

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

377

% self.name))

378

return ret

379

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def timedelta_to_milliseconds(td):

269

def _timedelta_to_milliseconds(td):

381

270

"Convert a datetime.timedelta() to milliseconds"

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271

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

383

272

+ (td.seconds * 1000)

387

276

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

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389

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Attributes:

390

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

402

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

403

client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

416

checker, or None.

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

302

last_enabled: datetime.datetime(); (UTC)

418

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

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D-Bus identifiers

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

430

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

431

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

432

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

433

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

434

"extended_timeout": "15m",

435

"interval": "2m",

436

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

437

"host": "",

438

"approval_delay": "0s",

439

"approval_duration": "1s",

440

"approved_by_default": "True",

441

"enabled": "True",

442

}

443

318

444

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def timeout_milliseconds(self):

445

320

"Return the 'timeout' attribute in milliseconds"

446

return timedelta_to_milliseconds(self.timeout)

321

return _timedelta_to_milliseconds(self.timeout)

447

322

448

323

def extended_timeout_milliseconds(self):

449

324

"Return the 'extended_timeout' attribute in milliseconds"

450

return timedelta_to_milliseconds(self.extended_timeout)

325

return _timedelta_to_milliseconds(self.extended_timeout)

451

326

452

327

def interval_milliseconds(self):

453

328

"Return the 'interval' attribute in milliseconds"

454

return timedelta_to_milliseconds(self.interval)

329

return _timedelta_to_milliseconds(self.interval)

455

330

456

331

def approval_delay_milliseconds(self):

457

return timedelta_to_milliseconds(self.approval_delay)

458

459

@staticmethod

460

def config_parser(config):

461

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

462

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

463

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

464

settings = {}

465

for client_name in config.sections():

466

section = dict(config.items(client_name))

467

client = settings[client_name] = {}

468

469

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

470

# Reformat values from string types to Python types

471

client["approved_by_default"] = config.getboolean(

472

client_name, "approved_by_default")

473

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

474

475

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

476

.replace(" ", ""))

477

if "secret" in section:

478

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

479

elif "secfile" in section:

480

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

481

(section["secfile"])),

482

"rb") as secfile:

483

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

484

else:

485

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

486

% section)

487

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

488

client["extended_timeout"] = string_to_delta(

489

section["extended_timeout"])

490

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

491

client["approval_delay"] = string_to_delta(

492

section["approval_delay"])

493

client["approval_duration"] = string_to_delta(

494

section["approval_duration"])

495

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

496

client["last_approval_request"] = None

497

client["last_checked_ok"] = None

498

client["last_checker_status"] = None

499

if client["enabled"]:

500

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

501

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

502

+ client["timeout"])

503

else:

504

client["last_enabled"] = None

505

client["expires"] = None

506

507

return settings

508

509

510

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

332

return _timedelta_to_milliseconds(self.approval_delay)

333

334

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

511

335

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

512

336

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

513

337

attribute."""

514

338

self.name = name

515

# adding all client settings

516

for setting, value in settings.iteritems():

517

setattr(self, setting, value)

518

339

if config is None:

340

config = {}

519

341

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

520

342

# Uppercase and remove spaces from fingerprint for later

521

343

# comparison purposes with return value from the fingerprint()

522

344

# function

345

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

346

.replace(" ", ""))

523

347

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

524

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

525

526

# attributes specific for this server instance

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

527

369

self.checker = None

528

370

self.checker_initiator_tag = None

529

371

self.disable_initiator_tag = None

372

self.expires = None

530

373

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

531

375

self.current_checker_command = None

532

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

533

380

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"])

534

385

self.changedstate = (multiprocessing_manager

535

386

.Condition(multiprocessing_manager

536

387

.Lock()))

537

self.client_structure = [attr for attr in

538

self.__dict__.iterkeys()

539

if not attr.startswith("_")]

540

self.client_structure.append("client_structure")

541

542

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

543

lambda obj:

544

isinstance(obj,

545

property)):

546

if not name.startswith("_"):

547

self.client_structure.append(name)

548

388

549

# Send notice to process children that client state has changed

550

389

def send_changedstate(self):

551

with self.changedstate:

552

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

553

393

554

394

def enable(self):

555

395

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

557

397

# Already enabled

558

398

return

559

399

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

560

406

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

561

410

self.enabled = True

562

411

self.last_enabled = datetime.datetime.utcnow()

563

self.init_checker()

412

# Also start a new checker *right now*.

413

self.start_checker()

564

414

565

415

def disable(self, quiet=True):

566

416

"""Disable this client."""

578

428

gobject.source_remove(self.checker_initiator_tag)

579

429

self.checker_initiator_tag = None

580

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

581

433

self.enabled = False

582

434

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

583

435

return False

584

436

585

437

def __del__(self):

438

self.disable_hook = None

586

439

self.disable()

587

440

588

def init_checker(self):

589

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

590

# and every interval from then on.

591

self.checker_initiator_tag = (gobject.timeout_add

592

(self.interval_milliseconds(),

593

self.start_checker))

594

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

595

self.disable_initiator_tag = (gobject.timeout_add

596

(self.timeout_milliseconds(),

597

self.disable))

598

# Also start a new checker *right now*.

599

self.start_checker()

600

601

441

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

602

442

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

603

443

self.checker_callback_tag = None

604

444

self.checker = None

605

445

if os.WIFEXITED(condition):

606

self.last_checker_status = os.WEXITSTATUS(condition)

607

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

608

448

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

609

449

vars(self))

610

450

self.checked_ok()

612

452

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

613

453

vars(self))

614

454

else:

615

self.last_checker_status = -1

616

455

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

617

456

vars(self))

618

457

625

464

if timeout is None:

626

465

timeout = self.timeout

627

466

self.last_checked_ok = datetime.datetime.utcnow()

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

630

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

631

self.disable_initiator_tag = (gobject.timeout_add

632

(timedelta_to_milliseconds

633

(timeout), self.disable))

634

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

467

gobject.source_remove(self.disable_initiator_tag)

468

self.disable_initiator_tag = (gobject.timeout_add

469

(_timedelta_to_milliseconds

470

(timeout), self.disable))

471

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

635

472

636

473

def need_approval(self):

637

474

self.last_approval_request = datetime.datetime.utcnow()

852

689

853

690

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

854

691

"""

855

properties = {}

692

all = {}

856

693

for name, prop in self._get_all_dbus_properties():

857

694

if (interface_name

858

695

and interface_name != prop._dbus_interface):

863

700

continue

864

701

value = prop()

865

702

if not hasattr(value, "variant_level"):

866

properties[name] = value

703

all[name] = value

867

704

continue

868

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

869

value.variant_level+1)

870

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

705

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

706

value.variant_level+1)

707

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

871

708

872

709

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

873

710

out_signature="s",

924

761

return dbus.String(dt.isoformat(),

925

762

variant_level=variant_level)

926

763

927

928

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

929

765

.__metaclass__):

930

766

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

1022

858

attribute.func_closure)))

1023

859

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

1024

860

1025

1026

861

class ClientDBus(Client, DBusObjectWithProperties):

1027

862

"""A Client class using D-Bus

1028

863

1037

872

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

1038

873

1039

874

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

875

self._approvals_pending = 0

1040

876

self.bus = bus

1041

877

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

1042

self._approvals_pending = 0

1043

1044

self._approvals_pending = 0

1045

878

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

1046

879

# the D-Bus

1047

880

client_object_name = unicode(self.name).translate(

1057

890

variant_level=1):

1058

891

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

1059

892

its changes to DBus.

1060

1061

transform_fun: Function that takes a value and a variant_level

1062

and transforms it to a D-Bus type.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1063

896

dbus_name: D-Bus name of the variable

1064

897

type_func: Function that transform the value before sending it

1065

898

to the D-Bus. Default: no transform

1072

905

type_func(getattr(self, attrname, None))

1073

906

!= type_func(value)):

1074

907

dbus_value = transform_func(type_func(value),

1075

variant_level

1076

=variant_level)

908

variant_level)

1077

909

self.PropertyChanged(dbus.String(dbus_name),

1078

910

dbus_value)

1079

911

setattr(self, attrname, value)

1097

929

datetime_to_dbus, "LastApprovalRequest")

1098

930

approved_by_default = notifychangeproperty(dbus.Boolean,

1099

931

"ApprovedByDefault")

1100

approval_delay = notifychangeproperty(dbus.UInt64,

932

approval_delay = notifychangeproperty(dbus.UInt16,

1101

933

"ApprovalDelay",

1102

934

type_func =

1103

timedelta_to_milliseconds)

935

_timedelta_to_milliseconds)

1104

936

approval_duration = notifychangeproperty(

1105

dbus.UInt64, "ApprovalDuration",

1106

type_func = timedelta_to_milliseconds)

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1107

939

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

1108

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

940

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

1109

941

type_func =

1110

timedelta_to_milliseconds)

942

_timedelta_to_milliseconds)

1111

943

extended_timeout = notifychangeproperty(

1112

dbus.UInt64, "ExtendedTimeout",

1113

type_func = timedelta_to_milliseconds)

1114

interval = notifychangeproperty(dbus.UInt64,

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

1115

947

"Interval",

1116

948

type_func =

1117

timedelta_to_milliseconds)

949

_timedelta_to_milliseconds)

1118

950

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

1119

951

1120

952

del notifychangeproperty

1162

994

return r

1163

995

1164

996

def _reset_approved(self):

1165

self.approved = None

997

self._approved = None

1166

998

return False

1167

999

1168

1000

def approve(self, value=True):

1169

1001

self.send_changedstate()

1170

self.approved = value

1171

gobject.timeout_add(timedelta_to_milliseconds

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1172

1004

(self.approval_duration),

1173

1005

self._reset_approved)

1174

1006

1217

1049

"D-Bus signal"

1218

1050

return self.need_approval()

1219

1051

1220

# NeRwequest - signal

1221

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

1222

def NewRequest(self, ip):

1223

"""D-Bus signal

1224

Is sent after a client request a password.

1225

"""

1226

pass

1227

1228

1052

## Methods

1229

1053

1230

1054

# Approve - method

1288

1112

access="readwrite")

1289

1113

def ApprovalDuration_dbus_property(self, value=None):

1290

1114

if value is None: # get

1291

return dbus.UInt64(timedelta_to_milliseconds(

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1292

1116

self.approval_duration))

1293

1117

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

1294

1118

1308

1132

def Host_dbus_property(self, value=None):

1309

1133

if value is None: # get

1310

1134

return dbus.String(self.host)

1311

self.host = unicode(value)

1135

self.host = value

1312

1136

1313

1137

# Created - property

1314

1138

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

1315

1139

def Created_dbus_property(self):

1316

return datetime_to_dbus(self.created)

1140

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

1317

1141

1318

1142

# LastEnabled - property

1319

1143

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

1363

1187

gobject.source_remove(self.disable_initiator_tag)

1364

1188

self.disable_initiator_tag = None

1365

1189

self.expires = None

1366

time_to_die = timedelta_to_milliseconds((self

1367

.last_checked_ok

1368

+ self.timeout)

1369

- datetime.datetime

1370

.utcnow())

1190

time_to_die = (self.

1191

_timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow()))

1371

1196

if time_to_die <= 0:

1372

1197

# The timeout has passed

1373

1198

self.disable()

1395

1220

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

1396

1221

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

1397

1222

return

1398

if self.enabled:

1399

# Reschedule checker run

1400

gobject.source_remove(self.checker_initiator_tag)

1401

self.checker_initiator_tag = (gobject.timeout_add

1402

(value, self.start_checker))

1403

self.start_checker() # Start one now, too

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1404

1228

1405

1229

# Checker - property

1406

1230

@dbus_service_property(_interface, signature="s",

1408

1232

def Checker_dbus_property(self, value=None):

1409

1233

if value is None: # get

1410

1234

return dbus.String(self.checker_command)

1411

self.checker_command = unicode(value)

1235

self.checker_command = value

1412

1236

1413

1237

# CheckerRunning - property

1414

1238

@dbus_service_property(_interface, signature="b",

1443

1267

raise KeyError()

1444

1268

1445

1269

def __getattribute__(self, name):

1446

if name == '_pipe':

1270

if(name == '_pipe'):

1447

1271

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

1448

1272

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

1449

1273

data = self._pipe.recv()

1456

1280

return func

1457

1281

1458

1282

def __setattr__(self, name, value):

1459

if name == '_pipe':

1283

if(name == '_pipe'):

1460

1284

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

1461

1285

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

1462

1286

1463

1464

1287

class ClientDBusTransitional(ClientDBus):

1465

1288

__metaclass__ = AlternateDBusNamesMetaclass

1466

1289

1467

1468

1290

class ClientHandler(socketserver.BaseRequestHandler, object):

1469

1291

"""A class to handle client connections.

1470

1292

1538

1360

except KeyError:

1539

1361

return

1540

1362

1541

if self.server.use_dbus:

1542

# Emit D-Bus signal

1543

client.NewRequest(str(self.client_address))

1544

1545

1363

if client.approval_delay:

1546

1364

delay = client.approval_delay

1547

1365

client.approvals_pending += 1

1556

1374

client.Rejected("Disabled")

1557

1375

return

1558

1376

1559

if client.approved or not client.approval_delay:

1377

if client._approved or not client.approval_delay:

1560

1378

#We are approved or approval is disabled

1561

1379

break

1562

elif client.approved is None:

1380

elif client._approved is None:

1563

1381

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

1564

1382

client.name)

1565

1383

if self.server.use_dbus:

1579

1397

time = datetime.datetime.now()

1580

1398

client.changedstate.acquire()

1581

1399

(client.changedstate.wait

1582

(float(client.timedelta_to_milliseconds(delay)

1400

(float(client._timedelta_to_milliseconds(delay)

1583

1401

/ 1000)))

1584

1402

client.changedstate.release()

1585

1403

time2 = datetime.datetime.now()

1684

1502

# Convert the buffer to a Python bytestring

1685

1503

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

1686

1504

# Convert the bytestring to hexadecimal notation

1687

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

1505

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

1688

1506

return hex_fpr

1689

1507

1690

1508

1693

1511

def sub_process_main(self, request, address):

1694

1512

try:

1695

1513

self.finish_request(request, address)

1696

except Exception:

1514

except:

1697

1515

self.handle_error(request, address)

1698

1516

self.close_request(request)

1699

1517

1804

1622

self.enabled = False

1805

1623

self.clients = clients

1806

1624

if self.clients is None:

1807

self.clients = {}

1625

self.clients = set()

1808

1626

self.use_dbus = use_dbus

1809

1627

self.gnutls_priority = gnutls_priority

1810

1628

IPv6_TCPServer.__init__(self, server_address,

1857

1675

fpr = request[1]

1858

1676

address = request[2]

1859

1677

1860

for c in self.clients.itervalues():

1678

for c in self.clients:

1861

1679

if c.fingerprint == fpr:

1862

1680

client = c

1863

1681

break

1947

1765

return timevalue

1948

1766

1949

1767

1768

def if_nametoindex(interface):

1769

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

1770

1771

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

1772

global if_nametoindex

1773

try:

1774

if_nametoindex = (ctypes.cdll.LoadLibrary

1775

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

1776

.if_nametoindex)

1777

except (OSError, AttributeError):

1778

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

1779

def if_nametoindex(interface):

1780

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

1781

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

1782

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

1783

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1784

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

1785

interface))

1786

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

1787

ifreq[16:20])[0]

1788

return interface_index

1789

return if_nametoindex(interface)

1790

1791

1950

1792

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

1951

1793

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

1952

1794

2007

1849

" system bus interface")

2008

1850

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

2009

1851

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

2010

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

2011

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

2012

" state")

2013

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

2014

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

2015

2016

1852

options = parser.parse_args()

2017

1853

2018

1854

if options.check:

2031

1867

"use_dbus": "True",

2032

1868

"use_ipv6": "True",

2033

1869

"debuglevel": "",

2034

"restore": "True",

2035

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

2036

1870

}

2037

1871

2038

1872

# Parse config file for server-global settings

2055

1889

# options, if set.

2056

1890

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

2057

1891

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

2058

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

2059

"statedir"):

1892

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

2060

1893

value = getattr(options, option)

2061

1894

if value is not None:

2062

1895

server_settings[option] = value

2074

1907

debuglevel = server_settings["debuglevel"]

2075

1908

use_dbus = server_settings["use_dbus"]

2076

1909

use_ipv6 = server_settings["use_ipv6"]

2077

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

2078

stored_state_file)

2079

2080

if debug:

2081

initlogger(logging.DEBUG)

2082

else:

2083

if not debuglevel:

2084

initlogger()

2085

else:

2086

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

2087

initlogger(level)

2088

1910

2089

1911

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

2090

1912

syslogger.setFormatter(logging.Formatter

2093

1915

% server_settings["servicename"]))

2094

1916

2095

1917

# Parse config file with clients

2096

client_config = configparser.SafeConfigParser(Client.client_defaults)

1918

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

1919

"extended_timeout": "15m",

1920

"interval": "2m",

1921

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

1922

"host": "",

1923

"approval_delay": "0s",

1924

"approval_duration": "1s",

1925

}

1926

client_config = configparser.SafeConfigParser(client_defaults)

2097

1927

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

2098

1928

"clients.conf"))

2099

1929

2137

1967

if error[0] != errno.EPERM:

2138

1968

raise error

2139

1969

1970

if not debug and not debuglevel:

1971

syslogger.setLevel(logging.WARNING)

1972

console.setLevel(logging.WARNING)

1973

if debuglevel:

1974

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

1975

syslogger.setLevel(level)

1976

console.setLevel(level)

1977

2140

1978

if debug:

2141

1979

# Enable all possible GnuTLS debugging

2142

1980

2184

2022

server_settings["use_dbus"] = False

2185

2023

tcp_server.use_dbus = False

2186

2024

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2187

service = AvahiServiceToSyslog(name =

2188

server_settings["servicename"],

2189

servicetype = "_mandos._tcp",

2190

protocol = protocol, bus = bus)

2025

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

2026

servicetype = "_mandos._tcp",

2027

protocol = protocol, bus = bus)

2191

2028

if server_settings["interface"]:

2192

2029

service.interface = (if_nametoindex

2193

2030

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

2199

2036

if use_dbus:

2200

2037

client_class = functools.partial(ClientDBusTransitional,

2201

2038

bus = bus)

2202

2203

client_settings = Client.config_parser(client_config)

2204

old_client_settings = {}

2205

clients_data = {}

2206

2207

# Get client data and settings from last running state.

2208

if server_settings["restore"]:

2209

try:

2210

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

2211

clients_data, old_client_settings = (pickle.load

2212

(stored_state))

2213

os.remove(stored_state_path)

2214

except IOError as e:

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2218

raise

2219

2220

with PGPEngine() as pgp:

2221

for client_name, client in clients_data.iteritems():

2222

# Decide which value to use after restoring saved state.

2223

# We have three different values: Old config file,

2224

# new config file, and saved state.

2225

# New config value takes precedence if it differs from old

2226

# config value, otherwise use saved state.

2227

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

2228

try:

2229

# For each value in new config, check if it

2230

# differs from the old config value (Except for

2231

# the "secret" attribute)

2232

if (name != "secret" and

2233

value != old_client_settings[client_name]

2234

[name]):

2235

client[name] = value

2236

except KeyError:

2237

pass

2238

2239

# Clients who has passed its expire date can still be

2240

# enabled if its last checker was successful. Clients

2241

# whose checker failed before we stored its state is

2242

# assumed to have failed all checkers during downtime.

2243

if client["enabled"]:

2244

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

2245

if not client["last_checked_ok"]:

2246

logger.warning(

2247

"disabling client {0} - Client never "

2248

"performed a successfull checker"

2249

.format(client["name"]))

2250

client["enabled"] = False

2251

elif client["last_checker_status"] != 0:

2252

logger.warning(

2253

"disabling client {0} - Client "

2254

"last checker failed with error code {1}"

2255

.format(client["name"],

2256

client["last_checker_status"]))

2257

client["enabled"] = False

2258

else:

2259

client["expires"] = (datetime.datetime

2260

.utcnow()

2261

+ client["timeout"])

2262

2039

def client_config_items(config, section):

2040

special_settings = {

2041

"approved_by_default":

2042

lambda: config.getboolean(section,

2043

"approved_by_default"),

2044

}

2045

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

2263

2046

try:

2264

client["secret"] = (

2265

pgp.decrypt(client["encrypted_secret"],

2266

client_settings[client_name]

2267

["secret"]))

2268

except PGPError:

2269

# If decryption fails, we use secret from new settings

2270

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

2271

.format(client_name))

2272

client["secret"] = (

2273

client_settings[client_name]["secret"])

2274

2275

2276

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

2277

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

2278

del clients_data[client_name]

2279

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

2280

clients_data[client_name] = client_settings[client_name]

2281

2282

# Create clients all clients

2283

for client_name, client in clients_data.iteritems():

2284

tcp_server.clients[client_name] = client_class(

2285

name = client_name, settings = client)

2286

2047

yield (name, special_settings[name]())

2048

except KeyError:

2049

yield (name, value)

2050

2051

tcp_server.clients.update(set(

2052

client_class(name = section,

2053

config= dict(client_config_items(

2054

client_config, section)))

2055

for section in client_config.sections()))

2287

2056

if not tcp_server.clients:

2288

2057

logger.warning("No clients defined")

2289

2058

2300

2069

# "pidfile" was never created

2301

2070

pass

2302

2071

del pidfilename

2072

2303

2073

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

2304

2074

2305

2075

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

2331

2101

def GetAllClients(self):

2332

2102

"D-Bus method"

2333

2103

return dbus.Array(c.dbus_object_path

2334

for c in

2335

tcp_server.clients.itervalues())

2104

for c in tcp_server.clients)

2336

2105

2337

2106

@dbus.service.method(_interface,

2338

2107

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

2340

2109

"D-Bus method"

2341

2110

return dbus.Dictionary(

2342

2111

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

2343

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

2112

for c in tcp_server.clients),

2344

2113

signature="oa{sv}")

2345

2114

2346

2115

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

2347

2116

def RemoveClient(self, object_path):

2348

2117

"D-Bus method"

2349

for c in tcp_server.clients.itervalues():

2118

for c in tcp_server.clients:

2350

2119

if c.dbus_object_path == object_path:

2351

del tcp_server.clients[c.name]

2120

tcp_server.clients.remove(c)

2352

2121

c.remove_from_connection()

2353

2122

# Don't signal anything except ClientRemoved

2354

2123

c.disable(quiet=True)

2368

2137

service.cleanup()

2369

2138

2370

2139

multiprocessing.active_children()

2371

if not (tcp_server.clients or client_settings):

2372

return

2373

2374

# Store client before exiting. Secrets are encrypted with key

2375

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

2376

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

2377

clients = {}

2378

with PGPEngine() as pgp:

2379

for client in tcp_server.clients.itervalues():

2380

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

2381

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

2382

key)

2383

client_dict = {}

2384

2385

# A list of attributes that can not be pickled

2386

# + secret.

2387

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

2388

"checker"))

2389

for name, typ in (inspect.getmembers

2390

(dbus.service.Object)):

2391

exclude.add(name)

2392

2393

client_dict["encrypted_secret"] = (client

2394

.encrypted_secret)

2395

for attr in client.client_structure:

2396

if attr not in exclude:

2397

client_dict[attr] = getattr(client, attr)

2398

2399

clients[client.name] = client_dict

2400

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

2401

2402

try:

2403

with os.fdopen(os.open(stored_state_path,

2404

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

2405

0600), "wb") as stored_state:

2406

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

2407

except (IOError, OSError) as e:

2408

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

2409

.format(e))

2410

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

2411

raise

2412

2413

# Delete all clients, and settings from config

2414

2140

while tcp_server.clients:

2415

name, client = tcp_server.clients.popitem()

2141

client = tcp_server.clients.pop()

2416

2142

if use_dbus:

2417

2143

client.remove_from_connection()

2144

client.disable_hook = None

2418

2145

# Don't signal anything except ClientRemoved

2419

2146

client.disable(quiet=True)

2420

2147

if use_dbus:

2422

2149

mandos_dbus_service.ClientRemoved(client

2423

2150

.dbus_object_path,

2424

2151

client.name)

2425

client_settings.clear()

2426

2152

2427

2153

atexit.register(cleanup)

2428

2154

2429

for client in tcp_server.clients.itervalues():

2155

for client in tcp_server.clients:

2430

2156

if use_dbus:

2431

2157

# Emit D-Bus signal

2432

2158

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2433

# Need to initiate checking of clients

2434

if client.enabled:

2435

client.init_checker()

2159

client.enable()

2436

2160

2437

2161

tcp_server.enable()

2438

2162

tcp_server.server_activate()

2478

2202

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

2479

2203

cleanup()

2480

2204

2205

2481

2206

if __name__ == '__main__':

2482

2207

main()