/mandos/trunk : revision 819

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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49

except ImportError:

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import tempfile

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import itertools

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import collections

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import codecs

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import dbus

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import dbus.service

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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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def subprocess_call_pipe(connection, # : multiprocessing.Connection

427

*args, **kwargs):

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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

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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):

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_fields_ = []

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certificate_credentials_t = ctypes.POINTER(

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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

489

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

490

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

539

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

698

def call_pipe(connection, # : multiprocessing.Connection

699

func, *args, **kwargs):

428

700

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

429

701

430

This function runs a synchronous subprocess.call(), and writes the

431

resulting return code on the provided multiprocessing.Connection.

702

This function runs func(*args, **kwargs), and writes the resulting

703

return value on the provided multiprocessing.Connection.

432

704

"""

433

connection.send(subprocess.call(*args, **kwargs))

705

connection.send(func(*args, **kwargs))

434

706

connection.close()

435

707

436

708

class Client(object):

645

917

# Also start a new checker *right now*.

646

918

self.start_checker()

647

919

648

def checker_callback(self, source, condition,

649

(connection, command)):

920

def checker_callback(self, source, condition, connection,

921

command):

650

922

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

651

923

self.checker_callback_tag = None

652

924

self.checker = None

653

# Read return code from connection (see subprocess_call_pipe)

925

# Read return code from connection (see call_pipe)

654

926

returncode = connection.recv()

655

927

connection.close()

656

928

740

1012

and self.server_settings["foreground"]):

741

1013

popen_args.update({"stdout": wnull,

742

1014

"stderr": wnull })

743

pipe = multiprocessing.Pipe(duplex=False)

1015

pipe = multiprocessing.Pipe(duplex = False)

744

1016

self.checker = multiprocessing.Process(

745

target=subprocess_call_pipe, args=(pipe[1], command),

746

kwargs=popen_args)

1017

target = call_pipe,

1018

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

1019

kwargs = popen_args)

747

1020

self.checker.start()

748

1021

self.checker_callback_tag = gobject.io_add_watch(

749

1022

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

750

self.checker_callback, (pipe[0], command))

1023

self.checker_callback, pipe[0], command)

751

1024

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

752

1025

return True

753

1026

829

1102

access="r")

830

1103

def Property_dbus_property(self):

831

1104

return dbus.Boolean(False)

1105

1106

See also the DBusObjectWithAnnotations class.

832

1107

"""

833

1108

834

1109

def decorator(func):

856

1131

pass

857

1132

858

1133

859

class DBusObjectWithProperties(dbus.service.Object):

860

"""A D-Bus object with properties.

1134

class DBusObjectWithAnnotations(dbus.service.Object):

1135

"""A D-Bus object with annotations.

861

1136

862

Classes inheriting from this can use the dbus_service_property

863

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

864

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.

865

1139

"""

866

1140

867

1141

@staticmethod

883

1157

for name, athing in

884

1158

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

885

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

886

1231

def _get_dbus_property(self, interface_name, property_name):

887

1232

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

888

1233

property with the specified name and interface.

898

1243

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

899

1244

self.dbus_object_path, interface_name, property_name))

900

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

901

1255

@dbus.service.method(dbus.PROPERTIES_IFACE,

902

1256

in_signature="ss",

903

1257

out_signature="v")

973

1327

974

1328

Inserts property tags and interface annotation tags.

975

1329

"""

976

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

977

connection)

1330

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1331

object_path,

1332

connection)

978

1333

try:

979

1334

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

980

1335

993

1348

if prop._dbus_interface

994

1349

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

995

1350

if_tag.appendChild(tag)

996

# Add annotation tags

997

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

998

for tag in if_tag.getElementsByTagName(typ):

999

annots = dict()

1000

for name, prop in (self.

1001

_get_all_dbus_things(typ)):

1002

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

1003

and prop._dbus_interface

1004

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

1005

annots.update(getattr(

1006

prop, "_dbus_annotations", {}))

1007

for name, value in annots.items():

1008

ann_tag = document.createElement(

1009

"annotation")

1010

ann_tag.setAttribute("name", name)

1011

ann_tag.setAttribute("value", value)

1012

tag.appendChild(ann_tag)

1013

# Add interface annotation tags

1014

for annotation, value in dict(

1015

itertools.chain.from_iterable(

1016

annotations().items()

1017

for name, annotations

1018

in self._get_all_dbus_things("interface")

1019

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

1020

)).items():

1021

ann_tag = document.createElement("annotation")

1022

ann_tag.setAttribute("name", annotation)

1023

ann_tag.setAttribute("value", value)

1024

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)

1025

1367

# Add the names to the return values for the

1026

1368

# "org.freedesktop.DBus.Properties" methods

1027

1369

if (if_tag.getAttribute("name")

1045

1387

exc_info=error)

1046

1388

return xmlstring

1047

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

1048

1458

1049

1459

def datetime_to_dbus(dt, variant_level=0):

1050

1460

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

1097

1507

interface_names.add(alt_interface)

1098

1508

# Is this a D-Bus signal?

1099

1509

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

1100

# Extract the original non-method undecorated

1101

# function by black magic

1102

nonmethod_func = (dict(

1103

zip(attribute.func_code.co_freevars,

1104

attribute.__closure__))

1105

["func"].cell_contents)

1510

if sys.version_info.major == 2:

1511

# Extract the original non-method undecorated

1512

# function by black magic

1513

nonmethod_func = (dict(

1514

zip(attribute.func_code.co_freevars,

1515

attribute.__closure__))

1516

["func"].cell_contents)

1517

else:

1518

nonmethod_func = attribute

1106

1519

# Create a new, but exactly alike, function

1107

1520

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

1108

1521

# with the alternate D-Bus interface name

1522

if sys.version_info.major == 2:

1523

new_function = types.FunctionType(

1524

nonmethod_func.func_code,

1525

nonmethod_func.func_globals,

1526

nonmethod_func.func_name,

1527

nonmethod_func.func_defaults,

1528

nonmethod_func.func_closure)

1529

else:

1530

new_function = types.FunctionType(

1531

nonmethod_func.__code__,

1532

nonmethod_func.__globals__,

1533

nonmethod_func.__name__,

1534

nonmethod_func.__defaults__,

1535

nonmethod_func.__closure__)

1109

1536

new_function = (dbus.service.signal(

1110

alt_interface, attribute._dbus_signature)

1111

(types.FunctionType(

1112

nonmethod_func.func_code,

1113

nonmethod_func.func_globals,

1114

nonmethod_func.func_name,

1115

nonmethod_func.func_defaults,

1116

nonmethod_func.func_closure)))

1537

alt_interface,

1538

attribute._dbus_signature)(new_function))

1117

1539

# Copy annotations, if any

1118

1540

try:

1119

1541

new_function._dbus_annotations = dict(

1129

1551

func1 and func2 to the "call_both" function

1130

1552

outside of its arguments"""

1131

1553

1554

@functools.wraps(func2)

1132

1555

def call_both(*args, **kwargs):

1133

1556

"""This function will emit two D-Bus

1134

1557

signals by calling func1 and func2"""

1135

1558

func1(*args, **kwargs)

1136

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)

1137

1564

1138

1565

return call_both

1139

1566

# Create the "call_both" function and add it to

1343

1770

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

1344

1771

1345

1772

def checker_callback(self, source, condition,

1346

(connection, command), *args, **kwargs):

1773

connection, command, *args, **kwargs):

1347

1774

ret = Client.checker_callback(self, source, condition,

1348

(connection, command), *args,

1775

connection, command, *args,

1349

1776

**kwargs)

1350

1777

exitstatus = self.last_checker_status

1351

1778

if exitstatus >= 0:

1352

1779

# Emit D-Bus signal

1353

1780

self.CheckerCompleted(dbus.Int16(exitstatus),

1354

dbus.Int64(0),

1781

# This is specific to GNU libC

1782

dbus.Int64(exitstatus << 8),

1355

1783

dbus.String(command))

1356

1784

else:

1357

1785

# Emit D-Bus signal

1358

1786

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

1359

1787

dbus.Int64(

1360

self.last_checker_signal),

1788

# This is specific to GNU libC

1789

(exitstatus << 8)

1790

| self.last_checker_signal),

1361

1791

dbus.String(command))

1362

1792

return ret

1363

1793

1440

1870

self.checked_ok()

1441

1871

1442

1872

# Enable - method

1873

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

1443

1874

@dbus.service.method(_interface)

1444

1875

def Enable(self):

1445

1876

"D-Bus method"

1446

1877

self.enable()

1447

1878

1448

1879

# StartChecker - method

1880

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

1449

1881

@dbus.service.method(_interface)

1450

1882

def StartChecker(self):

1451

1883

"D-Bus method"

1452

1884

self.start_checker()

1453

1885

1454

1886

# Disable - method

1887

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

1455

1888

@dbus.service.method(_interface)

1456

1889

def Disable(self):

1457

1890

"D-Bus method"

1458

1891

self.disable()

1459

1892

1460

1893

# StopChecker - method

1894

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

1461

1895

@dbus.service.method(_interface)

1462

1896

def StopChecker(self):

1463

1897

self.stop_checker()

1499

1933

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

1500

1934

1501

1935

# Name - property

1936

@dbus_annotations(

1937

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

1502

1938

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

1503

1939

def Name_dbus_property(self):

1504

1940

return dbus.String(self.name)

1505

1941

1506

1942

# Fingerprint - property

1943

@dbus_annotations(

1944

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

1507

1945

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

1508

1946

def Fingerprint_dbus_property(self):

1509

1947

return dbus.String(self.fingerprint)

1518

1956

self.host = str(value)

1519

1957

1520

1958

# Created - property

1959

@dbus_annotations(

1960

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

1521

1961

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

1522

1962

def Created_dbus_property(self):

1523

1963

return datetime_to_dbus(self.created)

1638

2078

self.stop_checker()

1639

2079

1640

2080

# ObjectPath - property

2081

@dbus_annotations(

2082

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

2083

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

1641

2084

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

1642

2085

def ObjectPath_dbus_property(self):

1643

2086

return self.dbus_object_path # is already a dbus.ObjectPath

1644

2087

1645

2088

# Secret = property

2089

@dbus_annotations(

2090

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

2091

"invalidates"})

1646

2092

@dbus_service_property(_interface,

1647

2093

signature="ay",

1648

2094

access="write",

1658

2104

self._pipe = child_pipe

1659

2105

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

1660

2106

if not self._pipe.recv():

1661

raise KeyError()

2107

raise KeyError(fpr)

1662

2108

1663

2109

def __getattribute__(self, name):

1664

2110

if name == '_pipe':

1694

2140

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

1695

2141

self.server.child_pipe.fileno())

1696

2142

1697

session = gnutls.connection.ClientSession(

1698

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

1699

1700

# Note: gnutls.connection.X509Credentials is really a

1701

# generic GnuTLS certificate credentials object so long as

1702

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

1703

# here despite using OpenPGP certificates.

2143

session = gnutls.ClientSession(self.request)

1704

2144

1705

2145

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

1706

2146

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

1710

2150

priority = self.server.gnutls_priority

1711

2151

if priority is None:

1712

2152

priority = "NORMAL"

1713

gnutls.library.functions.gnutls_priority_set_direct(

1714

session._c_object, priority, None)

2153

gnutls.priority_set_direct(session._c_object, priority,

2154

None)

1715

2155

1716

2156

# Start communication using the Mandos protocol

1717

2157

# Get protocol number

1727

2167

# Start GnuTLS connection

1728

2168

try:

1729

2169

session.handshake()

1730

except gnutls.errors.GNUTLSError as error:

2170

except gnutls.Error as error:

1731

2171

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

1732

2172

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

1733

2173

# established. Just abandon the request.

1739

2179

try:

1740

2180

fpr = self.fingerprint(

1741

2181

self.peer_certificate(session))

1742

except (TypeError,

1743

gnutls.errors.GNUTLSError) as error:

2182

except (TypeError, gnutls.Error) as error:

1744

2183

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

1745

2184

return

1746

2185

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

1804

2243

else:

1805

2244

delay -= time2 - time

1806

2245

1807

sent_size = 0

1808

while sent_size < len(client.secret):

1809

try:

1810

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

1811

except gnutls.errors.GNUTLSError as error:

1812

logger.warning("gnutls send failed",

1813

exc_info=error)

1814

return

1815

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

1816

len(client.secret) - (sent_size

1817

+ sent))

1818

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

1819

2252

1820

2253

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

1821

2254

# bump the timeout using extended_timeout

1829

2262

client.approvals_pending -= 1

1830

2263

try:

1831

2264

session.bye()

1832

except gnutls.errors.GNUTLSError as error:

2265

except gnutls.Error as error:

1833

2266

logger.warning("GnuTLS bye failed",

1834

2267

exc_info=error)

1835

2268

1837

2270

def peer_certificate(session):

1838

2271

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

1839

2272

# If not an OpenPGP certificate...

1840

if (gnutls.library.functions.gnutls_certificate_type_get(

1841

session._c_object)

1842

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1843

# ...do the normal thing

1844

return session.peer_certificate

2273

if (gnutls.certificate_type_get(session._c_object)

2274

!= gnutls.CRT_OPENPGP):

2275

# ...return invalid data

2276

return b""

1845

2277

list_size = ctypes.c_uint(1)

1846

cert_list = (gnutls.library.functions

1847

.gnutls_certificate_get_peers

2278

cert_list = (gnutls.certificate_get_peers

1848

2279

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

1849

2280

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

1850

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

1851

" certificate")

2281

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

1852

2282

if list_size.value == 0:

1853

2283

return None

1854

2284

cert = cert_list[0]

1858

2288

def fingerprint(openpgp):

1859

2289

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1860

2290

# New GnuTLS "datum" with the OpenPGP public key

1861

datum = gnutls.library.types.gnutls_datum_t(

2291

datum = gnutls.datum_t(

1862

2292

ctypes.cast(ctypes.c_char_p(openpgp),

1863

2293

ctypes.POINTER(ctypes.c_ubyte)),

1864

2294

ctypes.c_uint(len(openpgp)))

1865

2295

# New empty GnuTLS certificate

1866

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1867

gnutls.library.functions.gnutls_openpgp_crt_init(

1868

ctypes.byref(crt))

2296

crt = gnutls.openpgp_crt_t()

2297

gnutls.openpgp_crt_init(ctypes.byref(crt))

1869

2298

# Import the OpenPGP public key into the certificate

1870

gnutls.library.functions.gnutls_openpgp_crt_import(

1871

crt, ctypes.byref(datum),

1872

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2299

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

2300

gnutls.OPENPGP_FMT_RAW)

1873

2301

# Verify the self signature in the key

1874

2302

crtverify = ctypes.c_uint()

1875

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1876

crt, 0, ctypes.byref(crtverify))

2303

gnutls.openpgp_crt_verify_self(crt, 0,

2304

ctypes.byref(crtverify))

1877

2305

if crtverify.value != 0:

1878

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1879

raise gnutls.errors.CertificateSecurityError(

1880

"Verify failed")

2306

gnutls.openpgp_crt_deinit(crt)

2307

raise gnutls.CertificateSecurityError("Verify failed")

1881

2308

# New buffer for the fingerprint

1882

2309

buf = ctypes.create_string_buffer(20)

1883

2310

buf_len = ctypes.c_size_t()

1884

2311

# Get the fingerprint from the certificate into the buffer

1885

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1886

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

2312

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

2313

ctypes.byref(buf_len))

1887

2314

# Deinit the certificate

1888

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2315

gnutls.openpgp_crt_deinit(crt)

1889

2316

# Convert the buffer to a Python bytestring

1890

2317

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

1891

2318

# Convert the bytestring to hexadecimal notation

2127

2554

2128

2555

if command == 'getattr':

2129

2556

attrname = request[1]

2130

if callable(client_object.__getattribute__(attrname)):

2557

if isinstance(client_object.__getattribute__(attrname),

2558

collections.Callable):

2131

2559

parent_pipe.send(('function', ))

2132

2560

else:

2133

2561

parent_pipe.send((

2168

2596

# avoid excessive use of external libraries.

2169

2597

2170

2598

# New type for defining tokens, syntax, and semantics all-in-one

2171

Token = collections.namedtuple("Token",

2172

("regexp", # To match token; if

2173

# "value" is not None,

2174

# must have a "group"

2175

# containing digits

2176

"value", # datetime.timedelta or

2177

# None

2178

"followers")) # Tokens valid after

2179

# this token

2180

2599

Token = collections.namedtuple("Token", (

2181

2600

"regexp", # To match token; if "value" is not None, must have

2182

2601

# a "group" containing digits

2217

2636

# Define starting values

2218

2637

value = datetime.timedelta() # Value so far

2219

2638

found_token = None

2220

followers = frozenset((token_duration,)) # Following valid tokens

2639

followers = frozenset((token_duration, )) # Following valid tokens

2221

2640

s = duration # String left to parse

2222

2641

# Loop until end token is found

2223

2642

while found_token is not token_end:

2240

2659

break

2241

2660

else:

2242

2661

# No currently valid tokens were found

2243

raise ValueError("Invalid RFC 3339 duration")

2662

raise ValueError("Invalid RFC 3339 duration: {!r}"

2663

.format(duration))

2244

2664

# End token found

2245

2665

return value

2246

2666

2379

2799

"debug": "False",

2380

2800

"priority":

2381

2801

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

2382

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

2802

":+SIGN-DSA-SHA256",

2383

2803

"servicename": "Mandos",

2384

2804

"use_dbus": "True",

2385

2805

"use_ipv6": "True",

2497

2917

pidfilename = "/var/run/mandos.pid"

2498

2918

pidfile = None

2499

2919

try:

2500

pidfile = open(pidfilename, "w")

2920

pidfile = codecs.open(pidfilename, "w", encoding="utf-8")

2501

2921

except IOError as e:

2502

2922

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

2503

2923

exc_info=e)

2504

2924

2505

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

2925

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

2926

("mandos", "mandos"),

2927

("nobody", "nogroup")):

2506

2928

try:

2507

2929

uid = pwd.getpwnam(name).pw_uid

2508

gid = pwd.getpwnam(name).pw_gid

2930

gid = pwd.getpwnam(group).pw_gid

2509

2931

break

2510

2932

except KeyError:

2511

2933

continue

2524

2946

2525

2947

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

2526

2948

# - GnuTLS manual

2527

gnutls.library.functions.gnutls_global_set_log_level(11)

2949

gnutls.global_set_log_level(11)

2528

2950

2529

@gnutls.library.types.gnutls_log_func

2951

@gnutls.log_func

2530

2952

def debug_gnutls(level, string):

2531

2953

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

2532

2954

2533

gnutls.library.functions.gnutls_global_set_log_function(

2534

debug_gnutls)

2955

gnutls.global_set_log_function(debug_gnutls)

2535

2956

2536

2957

# Redirect stdin so all checkers get /dev/null

2537

2958

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

2562

2983

old_bus_name = dbus.service.BusName(

2563

2984

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

2564

2985

do_not_queue=True)

2565

except dbus.exceptions.NameExistsException as e:

2986

except dbus.exceptions.DBusException as e:

2566

2987

logger.error("Disabling D-Bus:", exc_info=e)

2567

2988

use_dbus = False

2568

2989

server_settings["use_dbus"] = False

2699

3120

2700

3121

if not foreground:

2701

3122

if pidfile is not None:

3123

pid = os.getpid()

2702

3124

try:

2703

3125

with pidfile:

2704

pid = os.getpid()

2705

pidfile.write("{}\n".format(pid).encode("utf-8"))

3126

print(pid, file=pidfile)

2706

3127

except IOError:

2707

3128

logger.error("Could not write to file %r with PID %d",

2708

3129

pidfilename, pid)

2716

3137

2717

3138

@alternate_dbus_interfaces(

2718

3139

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

2719

class MandosDBusService(DBusObjectWithProperties):

3140

class MandosDBusService(DBusObjectWithObjectManager):

2720

3141

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

2721

3142

2722

3143

def __init__(self):

2724

3145

2725

3146

_interface = "se.recompile.Mandos"

2726

3147

2727

@dbus_interface_annotations(_interface)

2728

def _foo(self):

2729

return {

2730

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

2731

"false" }

2732

2733

3148

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

2734

3149

def ClientAdded(self, objpath):

2735

3150

"D-Bus signal"

2740

3155

"D-Bus signal"

2741

3156

pass

2742

3157

3158

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

3159

"true"})

2743

3160

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

2744

3161

def ClientRemoved(self, objpath, name):

2745

3162

"D-Bus signal"

2746

3163

pass

2747

3164

3165

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

3166

"true"})

2748

3167

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

2749

3168

def GetAllClients(self):

2750

3169

"D-Bus method"

2751

3170

return dbus.Array(c.dbus_object_path for c in

2752

3171

tcp_server.clients.itervalues())

2753

3172

3173

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

3174

"true"})

2754

3175

@dbus.service.method(_interface,

2755

3176

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

2756

3177

def GetAllClientsWithProperties(self):

2757

3178

"D-Bus method"

2758

3179

return dbus.Dictionary(

2759

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

3180

{ c.dbus_object_path: c.GetAll(

3181

"se.recompile.Mandos.Client")

2760

3182

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

2761

3183

signature="oa{sv}")

2762

3184

2767

3189

if c.dbus_object_path == object_path:

2768

3190

del tcp_server.clients[c.name]

2769

3191

c.remove_from_connection()

2770

# Don't signal anything except ClientRemoved

3192

# Don't signal the disabling

2771

3193

c.disable(quiet=True)

2772

# Emit D-Bus signal

2773

self.ClientRemoved(object_path, c.name)

3194

# Emit D-Bus signal for removal

3195

self.client_removed_signal(c)

2774

3196

return

2775

3197

raise KeyError(object_path)

2776

3198

2777

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)

2778

3236

2779

3237

mandos_dbus_service = MandosDBusService()

2780

3238

2845

3303

name, client = tcp_server.clients.popitem()

2846

3304

if use_dbus:

2847

3305

client.remove_from_connection()

2848

# Don't signal anything except ClientRemoved

3306

# Don't signal the disabling

2849

3307

client.disable(quiet=True)

3308

# Emit D-Bus signal for removal

2850

3309

if use_dbus:

2851

# Emit D-Bus signal

2852

mandos_dbus_service.ClientRemoved(

2853

client.dbus_object_path, client.name)

3310

mandos_dbus_service.client_removed_signal(client)

2854

3311

client_settings.clear()

2855

3312

2856

3313

atexit.register(cleanup)

2857

3314

2858

3315

for client in tcp_server.clients.itervalues():

2859

3316

if use_dbus:

2860

# Emit D-Bus signal

2861

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3317

# Emit D-Bus signal for adding

3318

mandos_dbus_service.client_added_signal(client)

2862

3319

# Need to initiate checking of clients

2863

3320

if client.enabled:

2864

3321

client.init_checker()