/mandos/release : revision 237.7.368

1

#!/usr/bin/python2.7

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#!/usr/bin/python

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# -*- mode: python; coding: utf-8 -*-

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#

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# Mandos server - give out binary blobs to connecting clients.

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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import argparse

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import datetime

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import errno

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import gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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try:

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import ConfigParser as configparser

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except ImportError:

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import dbus

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import dbus.service

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try:

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import gobject

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from gi.repository import GObject

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except ImportError:

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from gi.repository import GObject as gobject

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import gobject as GObject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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version = "1.7.3"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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def __init__(self):

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

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self.gpg = "gpg"

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try:

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output = subprocess.check_output(["gpgconf"])

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for line in output.splitlines():

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name, text, path = line.split(":")

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if name == "gpg":

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self.gpg = path

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break

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except OSError as e:

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if e.errno != errno.ENOENT:

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raise

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--homedir', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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dir = self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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

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self.cleanup()

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elif state == avahi.SERVER_RUNNING:

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self.add()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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if (error.get_dbus_name()

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== "org.freedesktop.Avahi.CollisionError"):

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logger.info("Local Zeroconf service name"

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" collision.")

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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else:

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if error is None:

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

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.format(self.name)))

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return ret

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# Pretend that we have a GnuTLS module

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class GnuTLS(object):

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"""This isn't so much a class as it is a module-like namespace.

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It is instantiated once, and simulates having a GnuTLS module."""

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_library = ctypes.cdll.LoadLibrary(

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ctypes.util.find_library("gnutls"))

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_need_version = "3.3.0"

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def __init__(self):

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# Need to use class name "GnuTLS" here, since this method is

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# called before the assignment to the "gnutls" global variable

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# happens.

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if GnuTLS.check_version(self._need_version) is None:

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raise GnuTLS.Error("Needs GnuTLS {} or later"

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.format(self._need_version))

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# Unless otherwise indicated, the constants and types below are

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# all from the gnutls/gnutls.h C header file.

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# Constants

463

E_SUCCESS = 0

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E_INTERRUPTED = -52

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E_AGAIN = -28

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CRT_OPENPGP = 2

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CLIENT = 2

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SHUT_RDWR = 0

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CRD_CERTIFICATE = 1

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E_NO_CERTIFICATE_FOUND = -49

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OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

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# Types

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class session_int(ctypes.Structure):

475

_fields_ = []

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session_t = ctypes.POINTER(session_int)

477

class certificate_credentials_st(ctypes.Structure):

478

_fields_ = []

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certificate_credentials_t = ctypes.POINTER(

480

certificate_credentials_st)

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certificate_type_t = ctypes.c_int

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class datum_t(ctypes.Structure):

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_fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),

484

('size', ctypes.c_uint)]

485

class openpgp_crt_int(ctypes.Structure):

486

_fields_ = []

487

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

488

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

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log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)

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credentials_type_t = ctypes.c_int #

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transport_ptr_t = ctypes.c_void_p

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close_request_t = ctypes.c_int

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494

# Exceptions

495

class Error(Exception):

496

# We need to use the class name "GnuTLS" here, since this

497

# exception might be raised from within GnuTLS.__init__,

498

# which is called before the assignment to the "gnutls"

499

# global variable has happened.

500

def __init__(self, message = None, code = None, args=()):

501

# Default usage is by a message string, but if a return

502

# code is passed, convert it to a string with

503

# gnutls.strerror()

504

self.code = code

505

if message is None and code is not None:

506

message = GnuTLS.strerror(code)

507

return super(GnuTLS.Error, self).__init__(

508

message, *args)

509

510

class CertificateSecurityError(Error):

511

pass

512

513

# Classes

514

class Credentials(object):

515

def __init__(self):

516

self._c_object = gnutls.certificate_credentials_t()

517

gnutls.certificate_allocate_credentials(

518

ctypes.byref(self._c_object))

519

self.type = gnutls.CRD_CERTIFICATE

520

521

def __del__(self):

522

gnutls.certificate_free_credentials(self._c_object)

523

524

class ClientSession(object):

525

def __init__(self, socket, credentials = None):

526

self._c_object = gnutls.session_t()

527

gnutls.init(ctypes.byref(self._c_object), gnutls.CLIENT)

528

gnutls.set_default_priority(self._c_object)

529

gnutls.transport_set_ptr(self._c_object, socket.fileno())

530

gnutls.handshake_set_private_extensions(self._c_object,

531

True)

532

self.socket = socket

533

if credentials is None:

534

credentials = gnutls.Credentials()

535

gnutls.credentials_set(self._c_object, credentials.type,

536

ctypes.cast(credentials._c_object,

537

ctypes.c_void_p))

538

self.credentials = credentials

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540

def __del__(self):

541

gnutls.deinit(self._c_object)

542

543

def handshake(self):

544

return gnutls.handshake(self._c_object)

545

546

def send(self, data):

547

data = bytes(data)

548

data_len = len(data)

549

while data_len > 0:

550

data_len -= gnutls.record_send(self._c_object,

551

data[-data_len:],

552

data_len)

553

554

def bye(self):

555

return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)

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557

# Error handling functions

558

def _error_code(result):

559

"""A function to raise exceptions on errors, suitable

560

for the 'restype' attribute on ctypes functions"""

561

if result >= 0:

562

return result

563

if result == gnutls.E_NO_CERTIFICATE_FOUND:

564

raise gnutls.CertificateSecurityError(code = result)

565

raise gnutls.Error(code = result)

566

567

def _retry_on_error(result, func, arguments):

568

"""A function to retry on some errors, suitable

569

for the 'errcheck' attribute on ctypes functions"""

570

while result < 0:

571

if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):

572

return _error_code(result)

573

result = func(*arguments)

574

return result

575

576

# Unless otherwise indicated, the function declarations below are

577

# all from the gnutls/gnutls.h C header file.

578

579

# Functions

580

priority_set_direct = _library.gnutls_priority_set_direct

581

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

582

ctypes.POINTER(ctypes.c_char_p)]

583

priority_set_direct.restype = _error_code

584

585

init = _library.gnutls_init

586

init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]

587

init.restype = _error_code

588

589

set_default_priority = _library.gnutls_set_default_priority

590

set_default_priority.argtypes = [session_t]

591

set_default_priority.restype = _error_code

592

593

record_send = _library.gnutls_record_send

594

record_send.argtypes = [session_t, ctypes.c_void_p,

595

ctypes.c_size_t]

596

record_send.restype = ctypes.c_ssize_t

597

record_send.errcheck = _retry_on_error

598

599

certificate_allocate_credentials = (

600

_library.gnutls_certificate_allocate_credentials)

601

certificate_allocate_credentials.argtypes = [

602

ctypes.POINTER(certificate_credentials_t)]

603

certificate_allocate_credentials.restype = _error_code

604

605

certificate_free_credentials = (

606

_library.gnutls_certificate_free_credentials)

607

certificate_free_credentials.argtypes = [certificate_credentials_t]

608

certificate_free_credentials.restype = None

609

610

handshake_set_private_extensions = (

611

_library.gnutls_handshake_set_private_extensions)

612

handshake_set_private_extensions.argtypes = [session_t,

613

ctypes.c_int]

614

handshake_set_private_extensions.restype = None

615

616

credentials_set = _library.gnutls_credentials_set

617

credentials_set.argtypes = [session_t, credentials_type_t,

618

ctypes.c_void_p]

619

credentials_set.restype = _error_code

620

621

strerror = _library.gnutls_strerror

622

strerror.argtypes = [ctypes.c_int]

623

strerror.restype = ctypes.c_char_p

624

625

certificate_type_get = _library.gnutls_certificate_type_get

626

certificate_type_get.argtypes = [session_t]

627

certificate_type_get.restype = _error_code

628

629

certificate_get_peers = _library.gnutls_certificate_get_peers

630

certificate_get_peers.argtypes = [session_t,

631

ctypes.POINTER(ctypes.c_uint)]

632

certificate_get_peers.restype = ctypes.POINTER(datum_t)

633

634

global_set_log_level = _library.gnutls_global_set_log_level

635

global_set_log_level.argtypes = [ctypes.c_int]

636

global_set_log_level.restype = None

637

638

global_set_log_function = _library.gnutls_global_set_log_function

639

global_set_log_function.argtypes = [log_func]

640

global_set_log_function.restype = None

641

642

deinit = _library.gnutls_deinit

643

deinit.argtypes = [session_t]

644

deinit.restype = None

645

646

handshake = _library.gnutls_handshake

647

handshake.argtypes = [session_t]

648

handshake.restype = _error_code

649

handshake.errcheck = _retry_on_error

650

651

transport_set_ptr = _library.gnutls_transport_set_ptr

652

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

653

transport_set_ptr.restype = None

654

655

bye = _library.gnutls_bye

656

bye.argtypes = [session_t, close_request_t]

657

bye.restype = _error_code

658

bye.errcheck = _retry_on_error

659

660

check_version = _library.gnutls_check_version

661

check_version.argtypes = [ctypes.c_char_p]

662

check_version.restype = ctypes.c_char_p

663

664

# All the function declarations below are from gnutls/openpgp.h

665

666

openpgp_crt_init = _library.gnutls_openpgp_crt_init

667

openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]

668

openpgp_crt_init.restype = _error_code

669

670

openpgp_crt_import = _library.gnutls_openpgp_crt_import

671

openpgp_crt_import.argtypes = [openpgp_crt_t,

672

ctypes.POINTER(datum_t),

673

openpgp_crt_fmt_t]

674

openpgp_crt_import.restype = _error_code

675

676

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

677

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

678

ctypes.POINTER(ctypes.c_uint)]

679

openpgp_crt_verify_self.restype = _error_code

680

681

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

682

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

683

openpgp_crt_deinit.restype = None

684

685

openpgp_crt_get_fingerprint = (

686

_library.gnutls_openpgp_crt_get_fingerprint)

687

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

688

ctypes.c_void_p,

689

ctypes.POINTER(

690

ctypes.c_size_t)]

691

openpgp_crt_get_fingerprint.restype = _error_code

692

693

# Remove non-public functions

694

del _error_code, _retry_on_error

695

# Create the global "gnutls" object, simulating a module

696

gnutls = GnuTLS()

697

427

698

def call_pipe(connection, # : multiprocessing.Connection

428

699

func, *args, **kwargs):

429

700

"""This function is meant to be called by multiprocessing.Process

444

715

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

445

716

to see if the client lives.

446

717

'None' if no process is running.

447

checker_callback_tag: a gobject event source tag, or None

718

checker_callback_tag: a GObject event source tag, or None

448

719

checker_command: string; External command which is run to check

449

720

if client lives. %() expansions are done at

450

721

runtime with vars(self) as dict, so that for

451

722

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

452

checker_initiator_tag: a gobject event source tag, or None

723

checker_initiator_tag: a GObject event source tag, or None

453

724

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

454

725

client_structure: Object describing what attributes a client has

455

726

and is used for storing the client at exit

456

727

current_checker_command: string; current running checker_command

457

disable_initiator_tag: a gobject event source tag, or None

728

disable_initiator_tag: a GObject event source tag, or None

458

729

enabled: bool()

459

730

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

460

731

uniquely identify the client

614

885

if not quiet:

615

886

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

616

887

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

617

gobject.source_remove(self.disable_initiator_tag)

888

GObject.source_remove(self.disable_initiator_tag)

618

889

self.disable_initiator_tag = None

619

890

self.expires = None

620

891

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

621

gobject.source_remove(self.checker_initiator_tag)

892

GObject.source_remove(self.checker_initiator_tag)

622

893

self.checker_initiator_tag = None

623

894

self.stop_checker()

624

895

self.enabled = False

625

896

if not quiet:

626

897

self.send_changedstate()

627

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

898

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

628

899

return False

629

900

630

901

def __del__(self):

634

905

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

635

906

# and every interval from then on.

636

907

if self.checker_initiator_tag is not None:

637

gobject.source_remove(self.checker_initiator_tag)

638

self.checker_initiator_tag = gobject.timeout_add(

908

GObject.source_remove(self.checker_initiator_tag)

909

self.checker_initiator_tag = GObject.timeout_add(

639

910

int(self.interval.total_seconds() * 1000),

640

911

self.start_checker)

641

912

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

642

913

if self.disable_initiator_tag is not None:

643

gobject.source_remove(self.disable_initiator_tag)

644

self.disable_initiator_tag = gobject.timeout_add(

914

GObject.source_remove(self.disable_initiator_tag)

915

self.disable_initiator_tag = GObject.timeout_add(

645

916

int(self.timeout.total_seconds() * 1000), self.disable)

646

917

# Also start a new checker *right now*.

647

918

self.start_checker()

683

954

if timeout is None:

684

955

timeout = self.timeout

685

956

if self.disable_initiator_tag is not None:

686

gobject.source_remove(self.disable_initiator_tag)

957

GObject.source_remove(self.disable_initiator_tag)

687

958

self.disable_initiator_tag = None

688

959

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

689

self.disable_initiator_tag = gobject.timeout_add(

960

self.disable_initiator_tag = GObject.timeout_add(

690

961

int(timeout.total_seconds() * 1000), self.disable)

691

962

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

692

963

747

1018

args = (pipe[1], subprocess.call, command),

748

1019

kwargs = popen_args)

749

1020

self.checker.start()

750

self.checker_callback_tag = gobject.io_add_watch(

751

pipe[0].fileno(), gobject.IO_IN,

1021

self.checker_callback_tag = GObject.io_add_watch(

1022

pipe[0].fileno(), GObject.IO_IN,

752

1023

self.checker_callback, pipe[0], command)

753

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

1024

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

754

1025

return True

755

1026

756

1027

def stop_checker(self):

757

1028

"""Force the checker process, if any, to stop."""

758

1029

if self.checker_callback_tag:

759

gobject.source_remove(self.checker_callback_tag)

1030

GObject.source_remove(self.checker_callback_tag)

760

1031

self.checker_callback_tag = None

761

1032

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

762

1033

return

831

1102

access="r")

832

1103

def Property_dbus_property(self):

833

1104

return dbus.Boolean(False)

1105

1106

See also the DBusObjectWithAnnotations class.

834

1107

"""

835

1108

836

1109

def decorator(func):

858

1131

pass

859

1132

860

1133

861

class DBusObjectWithProperties(dbus.service.Object):

862

"""A D-Bus object with properties.

1134

class DBusObjectWithAnnotations(dbus.service.Object):

1135

"""A D-Bus object with annotations.

863

1136

864

Classes inheriting from this can use the dbus_service_property

865

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

866

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

1137

Classes inheriting from this can use the dbus_annotations

1138

decorator to add annotations to methods or signals.

867

1139

"""

868

1140

869

1141

@staticmethod

885

1157

for name, athing in

886

1158

inspect.getmembers(cls, self._is_dbus_thing(thing)))

887

1159

1160

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1161

out_signature = "s",

1162

path_keyword = 'object_path',

1163

connection_keyword = 'connection')

1164

def Introspect(self, object_path, connection):

1165

"""Overloading of standard D-Bus method.

1166

1167

Inserts annotation tags on methods and signals.

1168

"""

1169

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

1170

connection)

1171

try:

1172

document = xml.dom.minidom.parseString(xmlstring)

1173

1174

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

1175

# Add annotation tags

1176

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

1177

for tag in if_tag.getElementsByTagName(typ):

1178

annots = dict()

1179

for name, prop in (self.

1180

_get_all_dbus_things(typ)):

1181

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

1182

and prop._dbus_interface

1183

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

1184

annots.update(getattr(

1185

prop, "_dbus_annotations", {}))

1186

for name, value in annots.items():

1187

ann_tag = document.createElement(

1188

"annotation")

1189

ann_tag.setAttribute("name", name)

1190

ann_tag.setAttribute("value", value)

1191

tag.appendChild(ann_tag)

1192

# Add interface annotation tags

1193

for annotation, value in dict(

1194

itertools.chain.from_iterable(

1195

annotations().items()

1196

for name, annotations

1197

in self._get_all_dbus_things("interface")

1198

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

1199

)).items():

1200

ann_tag = document.createElement("annotation")

1201

ann_tag.setAttribute("name", annotation)

1202

ann_tag.setAttribute("value", value)

1203

if_tag.appendChild(ann_tag)

1204

# Fix argument name for the Introspect method itself

1205

if (if_tag.getAttribute("name")

1206

== dbus.INTROSPECTABLE_IFACE):

1207

for cn in if_tag.getElementsByTagName("method"):

1208

if cn.getAttribute("name") == "Introspect":

1209

for arg in cn.getElementsByTagName("arg"):

1210

if (arg.getAttribute("direction")

1211

== "out"):

1212

arg.setAttribute("name",

1213

"xml_data")

1214

xmlstring = document.toxml("utf-8")

1215

document.unlink()

1216

except (AttributeError, xml.dom.DOMException,

1217

xml.parsers.expat.ExpatError) as error:

1218

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

1219

exc_info=error)

1220

return xmlstring

1221

1222

1223

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1224

"""A D-Bus object with properties.

1225

1226

Classes inheriting from this can use the dbus_service_property

1227

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

1228

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

1229

"""

1230

888

1231

def _get_dbus_property(self, interface_name, property_name):

889

1232

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

890

1233

property with the specified name and interface.

900

1243

raise DBusPropertyNotFound("{}:{}.{}".format(

901

1244

self.dbus_object_path, interface_name, property_name))

902

1245

1246

@classmethod

1247

def _get_all_interface_names(cls):

1248

"""Get a sequence of all interfaces supported by an object"""

1249

return (name for name in set(getattr(getattr(x, attr),

1250

"_dbus_interface", None)

1251

for x in (inspect.getmro(cls))

1252

for attr in dir(x))

1253

if name is not None)

1254

903

1255

@dbus.service.method(dbus.PROPERTIES_IFACE,

904

1256

in_signature="ss",

905

1257

out_signature="v")

975

1327

976

1328

Inserts property tags and interface annotation tags.

977

1329

"""

978

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

979

connection)

1330

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1331

object_path,

1332

connection)

980

1333

try:

981

1334

document = xml.dom.minidom.parseString(xmlstring)

982

1335

995

1348

if prop._dbus_interface

996

1349

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

997

1350

if_tag.appendChild(tag)

998

# Add annotation tags

999

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

1000

for tag in if_tag.getElementsByTagName(typ):

1001

annots = dict()

1002

for name, prop in (self.

1003

_get_all_dbus_things(typ)):

1004

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

1005

and prop._dbus_interface

1006

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

1007

annots.update(getattr(

1008

prop, "_dbus_annotations", {}))

1009

for name, value in annots.items():

1010

ann_tag = document.createElement(

1011

"annotation")

1012

ann_tag.setAttribute("name", name)

1013

ann_tag.setAttribute("value", value)

1014

tag.appendChild(ann_tag)

1015

# Add interface annotation tags

1016

for annotation, value in dict(

1017

itertools.chain.from_iterable(

1018

annotations().items()

1019

for name, annotations

1020

in self._get_all_dbus_things("interface")

1021

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

1022

)).items():

1023

ann_tag = document.createElement("annotation")

1024

ann_tag.setAttribute("name", annotation)

1025

ann_tag.setAttribute("value", value)

1026

if_tag.appendChild(ann_tag)

1351

# Add annotation tags for properties

1352

for tag in if_tag.getElementsByTagName("property"):

1353

annots = dict()

1354

for name, prop in self._get_all_dbus_things(

1355

"property"):

1356

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

1357

and prop._dbus_interface

1358

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

1359

annots.update(getattr(

1360

prop, "_dbus_annotations", {}))

1361

for name, value in annots.items():

1362

ann_tag = document.createElement(

1363

"annotation")

1364

ann_tag.setAttribute("name", name)

1365

ann_tag.setAttribute("value", value)

1366

tag.appendChild(ann_tag)

1027

1367

# Add the names to the return values for the

1028

1368

# "org.freedesktop.DBus.Properties" methods

1029

1369

if (if_tag.getAttribute("name")

1047

1387

exc_info=error)

1048

1388

return xmlstring

1049

1389

1390

try:

1391

dbus.OBJECT_MANAGER_IFACE

1392

except AttributeError:

1393

dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"

1394

1395

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1396

"""A D-Bus object with an ObjectManager.

1397

1398

Classes inheriting from this exposes the standard

1399

GetManagedObjects call and the InterfacesAdded and

1400

InterfacesRemoved signals on the standard

1401

"org.freedesktop.DBus.ObjectManager" interface.

1402

1403

Note: No signals are sent automatically; they must be sent

1404

manually.

1405

"""

1406

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1407

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

1408

def GetManagedObjects(self):

1409

"""This function must be overridden"""

1410

raise NotImplementedError()

1411

1412

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1413

signature = "oa{sa{sv}}")

1414

def InterfacesAdded(self, object_path, interfaces_and_properties):

1415

pass

1416

1417

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature = "oas")

1418

def InterfacesRemoved(self, object_path, interfaces):

1419

pass

1420

1421

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1422

out_signature = "s",

1423

path_keyword = 'object_path',

1424

connection_keyword = 'connection')

1425

def Introspect(self, object_path, connection):

1426

"""Overloading of standard D-Bus method.

1427

1428

Override return argument name of GetManagedObjects to be

1429

"objpath_interfaces_and_properties"

1430

"""

1431

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1432

object_path,

1433

connection)

1434

try:

1435

document = xml.dom.minidom.parseString(xmlstring)

1436

1437

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

1438

# Fix argument name for the GetManagedObjects method

1439

if (if_tag.getAttribute("name")

1440

== dbus.OBJECT_MANAGER_IFACE):

1441

for cn in if_tag.getElementsByTagName("method"):

1442

if (cn.getAttribute("name")

1443

== "GetManagedObjects"):

1444

for arg in cn.getElementsByTagName("arg"):

1445

if (arg.getAttribute("direction")

1446

== "out"):

1447

arg.setAttribute(

1448

"name",

1449

"objpath_interfaces"

1450

"_and_properties")

1451

xmlstring = document.toxml("utf-8")

1452

document.unlink()

1453

except (AttributeError, xml.dom.DOMException,

1454

xml.parsers.expat.ExpatError) as error:

1455

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

1456

exc_info = error)

1457

return xmlstring

1050

1458

1051

1459

def datetime_to_dbus(dt, variant_level=0):

1052

1460

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

1143

1551

func1 and func2 to the "call_both" function

1144

1552

outside of its arguments"""

1145

1553

1554

@functools.wraps(func2)

1146

1555

def call_both(*args, **kwargs):

1147

1556

"""This function will emit two D-Bus

1148

1557

signals by calling func1 and func2"""

1149

1558

func1(*args, **kwargs)

1150

1559

func2(*args, **kwargs)

1560

# Make wrapper function look like a D-Bus signal

1561

for name, attr in inspect.getmembers(func2):

1562

if name.startswith("_dbus_"):

1563

setattr(call_both, name, attr)

1151

1564

1152

1565

return call_both

1153

1566

# Create the "call_both" function and add it to

1365

1778

if exitstatus >= 0:

1366

1779

# Emit D-Bus signal

1367

1780

self.CheckerCompleted(dbus.Int16(exitstatus),

1368

dbus.Int64(0),

1781

# This is specific to GNU libC

1782

dbus.Int64(exitstatus << 8),

1369

1783

dbus.String(command))

1370

1784

else:

1371

1785

# Emit D-Bus signal

1372

1786

self.CheckerCompleted(dbus.Int16(-1),

1373

1787

dbus.Int64(

1374

self.last_checker_signal),

1788

# This is specific to GNU libC

1789

(exitstatus << 8)

1790

| self.last_checker_signal),

1375

1791

dbus.String(command))

1376

1792

return ret

1377

1793

1391

1807

1392

1808

def approve(self, value=True):

1393

1809

self.approved = value

1394

gobject.timeout_add(int(self.approval_duration.total_seconds()

1810

GObject.timeout_add(int(self.approval_duration.total_seconds()

1395

1811

* 1000), self._reset_approved)

1396

1812

self.send_changedstate()

1397

1813

1454

1870

self.checked_ok()

1455

1871

1456

1872

# Enable - method

1873

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

1457

1874

@dbus.service.method(_interface)

1458

1875

def Enable(self):

1459

1876

"D-Bus method"

1460

1877

self.enable()

1461

1878

1462

1879

# StartChecker - method

1880

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

1463

1881

@dbus.service.method(_interface)

1464

1882

def StartChecker(self):

1465

1883

"D-Bus method"

1466

1884

self.start_checker()

1467

1885

1468

1886

# Disable - method

1887

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

1469

1888

@dbus.service.method(_interface)

1470

1889

def Disable(self):

1471

1890

"D-Bus method"

1472

1891

self.disable()

1473

1892

1474

1893

# StopChecker - method

1894

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

1475

1895

@dbus.service.method(_interface)

1476

1896

def StopChecker(self):

1477

1897

self.stop_checker()

1513

1933

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

1514

1934

1515

1935

# Name - property

1936

@dbus_annotations(

1937

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

1516

1938

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

1517

1939

def Name_dbus_property(self):

1518

1940

return dbus.String(self.name)

1519

1941

1520

1942

# Fingerprint - property

1943

@dbus_annotations(

1944

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

1521

1945

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

1522

1946

def Fingerprint_dbus_property(self):

1523

1947

return dbus.String(self.fingerprint)

1532

1956

self.host = str(value)

1533

1957

1534

1958

# Created - property

1959

@dbus_annotations(

1960

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

1535

1961

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

1536

1962

def Created_dbus_property(self):

1537

1963

return datetime_to_dbus(self.created)

1598

2024

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

1599

2025

is None):

1600

2026

return

1601

gobject.source_remove(self.disable_initiator_tag)

1602

self.disable_initiator_tag = gobject.timeout_add(

2027

GObject.source_remove(self.disable_initiator_tag)

2028

self.disable_initiator_tag = GObject.timeout_add(

1603

2029

int((self.expires - now).total_seconds() * 1000),

1604

2030

self.disable)

1605

2031

1625

2051

return

1626

2052

if self.enabled:

1627

2053

# Reschedule checker run

1628

gobject.source_remove(self.checker_initiator_tag)

1629

self.checker_initiator_tag = gobject.timeout_add(

2054

GObject.source_remove(self.checker_initiator_tag)

2055

self.checker_initiator_tag = GObject.timeout_add(

1630

2056

value, self.start_checker)

1631

2057

self.start_checker() # Start one now, too

1632

2058

1652

2078

self.stop_checker()

1653

2079

1654

2080

# ObjectPath - property

2081

@dbus_annotations(

2082

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",

2083

"org.freedesktop.DBus.Deprecated": "true"})

1655

2084

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

1656

2085

def ObjectPath_dbus_property(self):

1657

2086

return self.dbus_object_path # is already a dbus.ObjectPath

1658

2087

1659

2088

# Secret = property

2089

@dbus_annotations(

2090

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

2091

"invalidates"})

1660

2092

@dbus_service_property(_interface,

1661

2093

signature="ay",

1662

2094

access="write",

1708

2140

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

1709

2141

self.server.child_pipe.fileno())

1710

2142

1711

session = gnutls.connection.ClientSession(

1712

self.request, gnutls.connection .X509Credentials())

1713

1714

# Note: gnutls.connection.X509Credentials is really a

1715

# generic GnuTLS certificate credentials object so long as

1716

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

1717

# here despite using OpenPGP certificates.

2143

session = gnutls.ClientSession(self.request)

1718

2144

1719

2145

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

1720

2146

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

1724

2150

priority = self.server.gnutls_priority

1725

2151

if priority is None:

1726

2152

priority = "NORMAL"

1727

gnutls.library.functions.gnutls_priority_set_direct(

1728

session._c_object, priority, None)

2153

gnutls.priority_set_direct(session._c_object, priority,

2154

None)

1729

2155

1730

2156

# Start communication using the Mandos protocol

1731

2157

# Get protocol number

1741

2167

# Start GnuTLS connection

1742

2168

try:

1743

2169

session.handshake()

1744

except gnutls.errors.GNUTLSError as error:

2170

except gnutls.Error as error:

1745

2171

logger.warning("Handshake failed: %s", error)

1746

2172

# Do not run session.bye() here: the session is not

1747

2173

# established. Just abandon the request.

1753

2179

try:

1754

2180

fpr = self.fingerprint(

1755

2181

self.peer_certificate(session))

1756

except (TypeError,

1757

gnutls.errors.GNUTLSError) as error:

2182

except (TypeError, gnutls.Error) as error:

1758

2183

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

1759

2184

return

1760

2185

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

1818

2243

else:

1819

2244

delay -= time2 - time

1820

2245

1821

sent_size = 0

1822

while sent_size < len(client.secret):

1823

try:

1824

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

1825

except gnutls.errors.GNUTLSError as error:

1826

logger.warning("gnutls send failed",

1827

exc_info=error)

1828

return

1829

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

1830

len(client.secret) - (sent_size

1831

+ sent))

1832

sent_size += sent

2246

try:

2247

session.send(client.secret)

2248

except gnutls.Error as error:

2249

logger.warning("gnutls send failed",

2250

exc_info = error)

2251

return

1833

2252

1834

2253

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

1835

2254

# bump the timeout using extended_timeout

1843

2262

client.approvals_pending -= 1

1844

2263

try:

1845

2264

session.bye()

1846

except gnutls.errors.GNUTLSError as error:

2265

except gnutls.Error as error:

1847

2266

logger.warning("GnuTLS bye failed",

1848

2267

exc_info=error)

1849

2268

1851

2270

def peer_certificate(session):

1852

2271

"Return the peer's OpenPGP certificate as a bytestring"

1853

2272

# If not an OpenPGP certificate...

1854

if (gnutls.library.functions.gnutls_certificate_type_get(

1855

session._c_object)

1856

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1857

# ...do the normal thing

1858

return session.peer_certificate

2273

if (gnutls.certificate_type_get(session._c_object)

2274

!= gnutls.CRT_OPENPGP):

2275

# ...return invalid data

2276

return b""

1859

2277

list_size = ctypes.c_uint(1)

1860

cert_list = (gnutls.library.functions

1861

.gnutls_certificate_get_peers

2278

cert_list = (gnutls.certificate_get_peers

1862

2279

(session._c_object, ctypes.byref(list_size)))

1863

2280

if not bool(cert_list) and list_size.value != 0:

1864

raise gnutls.errors.GNUTLSError("error getting peer"

1865

" certificate")

2281

raise gnutls.Error("error getting peer certificate")

1866

2282

if list_size.value == 0:

1867

2283

return None

1868

2284

cert = cert_list[0]

1872

2288

def fingerprint(openpgp):

1873

2289

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1874

2290

# New GnuTLS "datum" with the OpenPGP public key

1875

datum = gnutls.library.types.gnutls_datum_t(

2291

datum = gnutls.datum_t(

1876

2292

ctypes.cast(ctypes.c_char_p(openpgp),

1877

2293

ctypes.POINTER(ctypes.c_ubyte)),

1878

2294

ctypes.c_uint(len(openpgp)))

1879

2295

# New empty GnuTLS certificate

1880

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1881

gnutls.library.functions.gnutls_openpgp_crt_init(

1882

ctypes.byref(crt))

2296

crt = gnutls.openpgp_crt_t()

2297

gnutls.openpgp_crt_init(ctypes.byref(crt))

1883

2298

# Import the OpenPGP public key into the certificate

1884

gnutls.library.functions.gnutls_openpgp_crt_import(

1885

crt, ctypes.byref(datum),

1886

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2299

gnutls.openpgp_crt_import(crt, ctypes.byref(datum),

2300

gnutls.OPENPGP_FMT_RAW)

1887

2301

# Verify the self signature in the key

1888

2302

crtverify = ctypes.c_uint()

1889

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1890

crt, 0, ctypes.byref(crtverify))

2303

gnutls.openpgp_crt_verify_self(crt, 0,

2304

ctypes.byref(crtverify))

1891

2305

if crtverify.value != 0:

1892

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1893

raise gnutls.errors.CertificateSecurityError(

1894

"Verify failed")

2306

gnutls.openpgp_crt_deinit(crt)

2307

raise gnutls.CertificateSecurityError("Verify failed")

1895

2308

# New buffer for the fingerprint

1896

2309

buf = ctypes.create_string_buffer(20)

1897

2310

buf_len = ctypes.c_size_t()

1898

2311

# Get the fingerprint from the certificate into the buffer

1899

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1900

crt, ctypes.byref(buf), ctypes.byref(buf_len))

2312

gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),

2313

ctypes.byref(buf_len))

1901

2314

# Deinit the certificate

1902

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2315

gnutls.openpgp_crt_deinit(crt)

1903

2316

# Convert the buffer to a Python bytestring

1904

2317

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

1905

2318

# Convert the bytestring to hexadecimal notation

2049

2462

gnutls_priority GnuTLS priority string

2050

2463

use_dbus: Boolean; to emit D-Bus signals or not

2051

2464

2052

Assumes a gobject.MainLoop event loop.

2465

Assumes a GObject.MainLoop event loop.

2053

2466

"""

2054

2467

2055

2468

def __init__(self, server_address, RequestHandlerClass,

2080

2493

2081

2494

def add_pipe(self, parent_pipe, proc):

2082

2495

# Call "handle_ipc" for both data and EOF events

2083

gobject.io_add_watch(

2496

GObject.io_add_watch(

2084

2497

parent_pipe.fileno(),

2085

gobject.IO_IN | gobject.IO_HUP,

2498

GObject.IO_IN | GObject.IO_HUP,

2086

2499

functools.partial(self.handle_ipc,

2087

2500

parent_pipe = parent_pipe,

2088

2501

proc = proc))

2092

2505

proc = None,

2093

2506

client_object=None):

2094

2507

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

2095

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

2508

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

2096

2509

# Wait for other process to exit

2097

2510

proc.join()

2098

2511

return False

2119

2532

parent_pipe.send(False)

2120

2533

return False

2121

2534

2122

gobject.io_add_watch(

2535

GObject.io_add_watch(

2123

2536

parent_pipe.fileno(),

2124

gobject.IO_IN | gobject.IO_HUP,

2537

GObject.IO_IN | GObject.IO_HUP,

2125

2538

functools.partial(self.handle_ipc,

2126

2539

parent_pipe = parent_pipe,

2127

2540

proc = proc,

2386

2799

"debug": "False",

2387

2800

"priority":

2388

2801

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

2389

":+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

2802

":+SIGN-DSA-SHA256",

2390

2803

"servicename": "Mandos",

2391

2804

"use_dbus": "True",

2392

2805

"use_ipv6": "True",

2509

2922

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

2510

2923

exc_info=e)

2511

2924

2512

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

2925

for name, group in (("_mandos", "_mandos"),

2926

("mandos", "mandos"),

2927

("nobody", "nogroup")):

2513

2928

try:

2514

2929

uid = pwd.getpwnam(name).pw_uid

2515

gid = pwd.getpwnam(name).pw_gid

2930

gid = pwd.getpwnam(group).pw_gid

2516

2931

break

2517

2932

except KeyError:

2518

2933

continue

2531

2946

2532

2947

# "Use a log level over 10 to enable all debugging options."

2533

2948

# - GnuTLS manual

2534

gnutls.library.functions.gnutls_global_set_log_level(11)

2949

gnutls.global_set_log_level(11)

2535

2950

2536

@gnutls.library.types.gnutls_log_func

2951

@gnutls.log_func

2537

2952

def debug_gnutls(level, string):

2538

2953

logger.debug("GnuTLS: %s", string[:-1])

2539

2954

2540

gnutls.library.functions.gnutls_global_set_log_function(

2541

debug_gnutls)

2955

gnutls.global_set_log_function(debug_gnutls)

2542

2956

2543

2957

# Redirect stdin so all checkers get /dev/null

2544

2958

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

2551

2965

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

2552

2966

daemon()

2553

2967

2554

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

2555

# need to inform gobject that threads will be used.

2556

gobject.threads_init()

2968

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

2969

# need to inform GObject that threads will be used.

2970

GObject.threads_init()

2557

2971

2558

2972

global main_loop

2559

2973

# From the Avahi example code

2560

2974

DBusGMainLoop(set_as_default=True)

2561

main_loop = gobject.MainLoop()

2975

main_loop = GObject.MainLoop()

2562

2976

bus = dbus.SystemBus()

2563

2977

# End of Avahi example code

2564

2978

if use_dbus:

2723

3137

2724

3138

@alternate_dbus_interfaces(

2725

3139

{ "se.recompile.Mandos": "se.bsnet.fukt.Mandos" })

2726

class MandosDBusService(DBusObjectWithProperties):

3140

class MandosDBusService(DBusObjectWithObjectManager):

2727

3141

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

2728

3142

2729

3143

def __init__(self):

2731

3145

2732

3146

_interface = "se.recompile.Mandos"

2733

3147

2734

@dbus_interface_annotations(_interface)

2735

def _foo(self):

2736

return {

2737

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

2738

"false" }

2739

2740

3148

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

2741

3149

def ClientAdded(self, objpath):

2742

3150

"D-Bus signal"

2747

3155

"D-Bus signal"

2748

3156

pass

2749

3157

3158

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

3159

"true"})

2750

3160

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

2751

3161

def ClientRemoved(self, objpath, name):

2752

3162

"D-Bus signal"

2753

3163

pass

2754

3164

3165

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

3166

"true"})

2755

3167

@dbus.service.method(_interface, out_signature="ao")

2756

3168

def GetAllClients(self):

2757

3169

"D-Bus method"

2758

3170

return dbus.Array(c.dbus_object_path for c in

2759

3171

tcp_server.clients.itervalues())

2760

3172

3173

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

3174

"true"})

2761

3175

@dbus.service.method(_interface,

2762

3176

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

2763

3177

def GetAllClientsWithProperties(self):

2764

3178

"D-Bus method"

2765

3179

return dbus.Dictionary(

2766

{ c.dbus_object_path: c.GetAll("")

3180

{ c.dbus_object_path: c.GetAll(

3181

"se.recompile.Mandos.Client")

2767

3182

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

2768

3183

signature="oa{sv}")

2769

3184

2774

3189

if c.dbus_object_path == object_path:

2775

3190

del tcp_server.clients[c.name]

2776

3191

c.remove_from_connection()

2777

# Don't signal anything except ClientRemoved

3192

# Don't signal the disabling

2778

3193

c.disable(quiet=True)

2779

# Emit D-Bus signal

2780

self.ClientRemoved(object_path, c.name)

3194

# Emit D-Bus signal for removal

3195

self.client_removed_signal(c)

2781

3196

return

2782

3197

raise KeyError(object_path)

2783

3198

2784

3199

del _interface

3200

3201

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3202

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

3203

def GetManagedObjects(self):

3204

"""D-Bus method"""

3205

return dbus.Dictionary(

3206

{ client.dbus_object_path:

3207

dbus.Dictionary(

3208

{ interface: client.GetAll(interface)

3209

for interface in

3210

client._get_all_interface_names()})

3211

for client in tcp_server.clients.values()})

3212

3213

def client_added_signal(self, client):

3214

"""Send the new standard signal and the old signal"""

3215

if use_dbus:

3216

# New standard signal

3217

self.InterfacesAdded(

3218

client.dbus_object_path,

3219

dbus.Dictionary(

3220

{ interface: client.GetAll(interface)

3221

for interface in

3222

client._get_all_interface_names()}))

3223

# Old signal

3224

self.ClientAdded(client.dbus_object_path)

3225

3226

def client_removed_signal(self, client):

3227

"""Send the new standard signal and the old signal"""

3228

if use_dbus:

3229

# New standard signal

3230

self.InterfacesRemoved(

3231

client.dbus_object_path,

3232

client._get_all_interface_names())

3233

# Old signal

3234

self.ClientRemoved(client.dbus_object_path,

3235

client.name)

2785

3236

2786

3237

mandos_dbus_service = MandosDBusService()

2787

3238

2852

3303

name, client = tcp_server.clients.popitem()

2853

3304

if use_dbus:

2854

3305

client.remove_from_connection()

2855

# Don't signal anything except ClientRemoved

3306

# Don't signal the disabling

2856

3307

client.disable(quiet=True)

3308

# Emit D-Bus signal for removal

2857

3309

if use_dbus:

2858

# Emit D-Bus signal

2859

mandos_dbus_service.ClientRemoved(

2860

client.dbus_object_path, client.name)

3310

mandos_dbus_service.client_removed_signal(client)

2861

3311

client_settings.clear()

2862

3312

2863

3313

atexit.register(cleanup)

2864

3314

2865

3315

for client in tcp_server.clients.itervalues():

2866

3316

if use_dbus:

2867

# Emit D-Bus signal

2868

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3317

# Emit D-Bus signal for adding

3318

mandos_dbus_service.client_added_signal(client)

2869

3319

# Need to initiate checking of clients

2870

3320

if client.enabled:

2871

3321

client.init_checker()

2897

3347

sys.exit(1)

2898

3348

# End of Avahi example code

2899

3349

2900

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

3350

GObject.io_add_watch(tcp_server.fileno(), GObject.IO_IN,

2901

3351

lambda *args, **kwargs:

2902

3352

(tcp_server.handle_request

2903

3353

(*args[2:], **kwargs) or True))