/mandos/trunk : revision 856

1

#!/usr/bin/python2.7

1

#!/usr/bin/python

2

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

3

#

4

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

11

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

12

#

13

# Everything else is

14

15

14

15

16

#

17

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

18

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

34

from __future__ import (division, absolute_import, print_function,

35

unicode_literals)

36

37

from future_builtins import *

37

try:

38

from future_builtins import *

39

except ImportError:

40

pass

38

41

39

42

try:

40

43

import SocketServer as socketserver

44

47

import argparse

45

48

import datetime

46

49

import errno

47

import gnutls.crypto

48

import gnutls.connection

49

import gnutls.errors

50

import gnutls.library.functions

51

import gnutls.library.constants

52

import gnutls.library.types

53

50

try:

54

51

import ConfigParser as configparser

55

52

except ImportError:

82

79

83

80

import dbus

84

81

import dbus.service

85

try:

86

import gobject

87

except ImportError:

88

from gi.repository import GObject as gobject

89

import avahi

82

from gi.repository import GLib

90

83

from dbus.mainloop.glib import DBusGMainLoop

91

84

import ctypes

92

85

import ctypes.util

93

86

import xml.dom.minidom

94

87

import inspect

95

88

89

# Try to find the value of SO_BINDTODEVICE:

96

90

try:

91

# This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and

92

# newer, and it is also the most natural place for it:

97

93

SO_BINDTODEVICE = socket.SO_BINDTODEVICE

98

94

except AttributeError:

99

95

try:

96

# This is where SO_BINDTODEVICE was up to and including Python

97

# 2.6, and also 3.2:

100

98

from IN import SO_BINDTODEVICE

101

99

except ImportError:

102

SO_BINDTODEVICE = None

100

# In Python 2.7 it seems to have been removed entirely.

101

# Try running the C preprocessor:

102

try:

103

cc = subprocess.Popen(["cc", "--language=c", "-E",

104

"/dev/stdin"],

105

stdin=subprocess.PIPE,

106

stdout=subprocess.PIPE)

107

stdout = cc.communicate(

108

"#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]

109

SO_BINDTODEVICE = int(stdout.splitlines()[-1])

110

except (OSError, ValueError, IndexError):

111

# No value found

112

SO_BINDTODEVICE = None

103

113

104

114

if sys.version_info.major == 2:

105

115

str = unicode

106

116

107

version = "1.6.9"

117

version = "1.7.8"

108

118

stored_state_file = "clients.pickle"

109

119

110

120

logger = logging.getLogger()

125

135

return interface_index

126

136

127

137

138

def copy_function(func):

139

"""Make a copy of a function"""

140

if sys.version_info.major == 2:

141

return types.FunctionType(func.func_code,

142

func.func_globals,

143

func.func_name,

144

func.func_defaults,

145

func.func_closure)

146

else:

147

return types.FunctionType(func.__code__,

148

func.__globals__,

149

func.__name__,

150

func.__defaults__,

151

func.__closure__)

152

153

128

154

def initlogger(debug, level=logging.WARNING):

129

155

"""init logger and add loglevel"""

130

156

157

183

158

184

def __init__(self):

159

185

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

186

self.gpg = "gpg"

187

try:

188

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

189

for line in output.splitlines():

190

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

191

if name == "gpg":

192

self.gpg = path

193

break

194

except OSError as e:

195

if e.errno != errno.ENOENT:

196

raise

160

197

self.gnupgargs = ['--batch',

161

'--home', self.tempdir,

198

'--homedir', self.tempdir,

162

199

'--force-mdc',

163

'--quiet',

164

'--no-use-agent']

200

'--quiet']

201

# Only GPG version 1 has the --no-use-agent option.

202

if self.gpg == "gpg" or self.gpg.endswith("/gpg"):

203

self.gnupgargs.append("--no-use-agent")

165

204

166

205

def __enter__(self):

167

206

return self

203

242

dir=self.tempdir) as passfile:

204

243

passfile.write(passphrase)

205

244

passfile.flush()

206

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

245

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

207

246

'--passphrase-file',

208

247

passfile.name]

209

248

+ self.gnupgargs,

221

260

dir = self.tempdir) as passfile:

222

261

passfile.write(passphrase)

223

262

passfile.flush()

224

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

263

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

225

264

'--passphrase-file',

226

265

passfile.name]

227

266

+ self.gnupgargs,

233

272

raise PGPError(err)

234

273

return decrypted_plaintext

235

274

275

# Pretend that we have an Avahi module

276

class Avahi(object):

277

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

278

It is instantiated once, and simulates having an Avahi module."""

279

IF_UNSPEC = -1 # avahi-common/address.h

280

PROTO_UNSPEC = -1 # avahi-common/address.h

281

PROTO_INET = 0 # avahi-common/address.h

282

PROTO_INET6 = 1 # avahi-common/address.h

283

DBUS_NAME = "org.freedesktop.Avahi"

284

DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

285

DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

286

DBUS_PATH_SERVER = "/"

287

def string_array_to_txt_array(self, t):

288

return dbus.Array((dbus.ByteArray(s.encode("utf-8"))

289

for s in t), signature="ay")

290

ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

291

ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

292

ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

293

SERVER_INVALID = 0 # avahi-common/defs.h

294

SERVER_REGISTERING = 1 # avahi-common/defs.h

295

SERVER_RUNNING = 2 # avahi-common/defs.h

296

SERVER_COLLISION = 3 # avahi-common/defs.h

297

SERVER_FAILURE = 4 # avahi-common/defs.h

298

avahi = Avahi()

236

299

237

300

class AvahiError(Exception):

238

301

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

395

458

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

396

459

self.cleanup()

397

460

elif state == avahi.SERVER_RUNNING:

398

self.add()

461

try:

462

self.add()

463

except dbus.exceptions.DBusException as error:

464

if (error.get_dbus_name()

465

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

466

logger.info("Local Zeroconf service name"

467

" collision.")

468

return self.rename(remove=False)

469

else:

470

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

471

self.cleanup()

472

os._exit(1)

399

473

else:

400

474

if error is None:

401

475

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

424

498

.format(self.name)))

425

499

return ret

426

500

501

# Pretend that we have a GnuTLS module

502

class GnuTLS(object):

503

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

504

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

505

506

_library = ctypes.cdll.LoadLibrary(

507

ctypes.util.find_library("gnutls"))

508

_need_version = b"3.3.0"

509

def __init__(self):

510

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

511

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

512

# happens.

513

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

514

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

515

.format(self._need_version))

516

517

# Unless otherwise indicated, the constants and types below are

518

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

519

520

# Constants

521

E_SUCCESS = 0

522

E_INTERRUPTED = -52

523

E_AGAIN = -28

524

CRT_OPENPGP = 2

525

CLIENT = 2

526

SHUT_RDWR = 0

527

CRD_CERTIFICATE = 1

528

E_NO_CERTIFICATE_FOUND = -49

529

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

530

531

# Types

532

class session_int(ctypes.Structure):

533

_fields_ = []

534

session_t = ctypes.POINTER(session_int)

535

class certificate_credentials_st(ctypes.Structure):

536

_fields_ = []

537

certificate_credentials_t = ctypes.POINTER(

538

certificate_credentials_st)

539

certificate_type_t = ctypes.c_int

540

class datum_t(ctypes.Structure):

541

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

542

('size', ctypes.c_uint)]

543

class openpgp_crt_int(ctypes.Structure):

544

_fields_ = []

545

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

546

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

547

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

548

credentials_type_t = ctypes.c_int

549

transport_ptr_t = ctypes.c_void_p

550

close_request_t = ctypes.c_int

551

552

# Exceptions

553

class Error(Exception):

554

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

555

# exception might be raised from within GnuTLS.__init__,

556

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

557

# global variable has happened.

558

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

559

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

560

# code is passed, convert it to a string with

561

# gnutls.strerror()

562

self.code = code

563

if message is None and code is not None:

564

message = GnuTLS.strerror(code)

565

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

566

message, *args)

567

568

class CertificateSecurityError(Error):

569

pass

570

571

# Classes

572

class Credentials(object):

573

def __init__(self):

574

self._c_object = gnutls.certificate_credentials_t()

575

gnutls.certificate_allocate_credentials(

576

ctypes.byref(self._c_object))

577

self.type = gnutls.CRD_CERTIFICATE

578

579

def __del__(self):

580

gnutls.certificate_free_credentials(self._c_object)

581

582

class ClientSession(object):

583

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

584

self._c_object = gnutls.session_t()

585

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

586

gnutls.set_default_priority(self._c_object)

587

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

588

gnutls.handshake_set_private_extensions(self._c_object,

589

True)

590

self.socket = socket

591

if credentials is None:

592

credentials = gnutls.Credentials()

593

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

594

ctypes.cast(credentials._c_object,

595

ctypes.c_void_p))

596

self.credentials = credentials

597

598

def __del__(self):

599

gnutls.deinit(self._c_object)

600

601

def handshake(self):

602

return gnutls.handshake(self._c_object)

603

604

def send(self, data):

605

data = bytes(data)

606

data_len = len(data)

607

while data_len > 0:

608

data_len -= gnutls.record_send(self._c_object,

609

data[-data_len:],

610

data_len)

611

612

def bye(self):

613

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

614

615

# Error handling functions

616

def _error_code(result):

617

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

618

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

619

if result >= 0:

620

return result

621

if result == gnutls.E_NO_CERTIFICATE_FOUND:

622

raise gnutls.CertificateSecurityError(code = result)

623

raise gnutls.Error(code = result)

624

625

def _retry_on_error(result, func, arguments):

626

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

627

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

628

while result < 0:

629

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

630

return _error_code(result)

631

result = func(*arguments)

632

return result

633

634

# Unless otherwise indicated, the function declarations below are

635

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

636

637

# Functions

638

priority_set_direct = _library.gnutls_priority_set_direct

639

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

640

ctypes.POINTER(ctypes.c_char_p)]

641

priority_set_direct.restype = _error_code

642

643

init = _library.gnutls_init

644

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

645

init.restype = _error_code

646

647

set_default_priority = _library.gnutls_set_default_priority

648

set_default_priority.argtypes = [session_t]

649

set_default_priority.restype = _error_code

650

651

record_send = _library.gnutls_record_send

652

record_send.argtypes = [session_t, ctypes.c_void_p,

653

ctypes.c_size_t]

654

record_send.restype = ctypes.c_ssize_t

655

record_send.errcheck = _retry_on_error

656

657

certificate_allocate_credentials = (

658

_library.gnutls_certificate_allocate_credentials)

659

certificate_allocate_credentials.argtypes = [

660

ctypes.POINTER(certificate_credentials_t)]

661

certificate_allocate_credentials.restype = _error_code

662

663

certificate_free_credentials = (

664

_library.gnutls_certificate_free_credentials)

665

certificate_free_credentials.argtypes = [certificate_credentials_t]

666

certificate_free_credentials.restype = None

667

668

handshake_set_private_extensions = (

669

_library.gnutls_handshake_set_private_extensions)

670

handshake_set_private_extensions.argtypes = [session_t,

671

ctypes.c_int]

672

handshake_set_private_extensions.restype = None

673

674

credentials_set = _library.gnutls_credentials_set

675

credentials_set.argtypes = [session_t, credentials_type_t,

676

ctypes.c_void_p]

677

credentials_set.restype = _error_code

678

679

strerror = _library.gnutls_strerror

680

strerror.argtypes = [ctypes.c_int]

681

strerror.restype = ctypes.c_char_p

682

683

certificate_type_get = _library.gnutls_certificate_type_get

684

certificate_type_get.argtypes = [session_t]

685

certificate_type_get.restype = _error_code

686

687

certificate_get_peers = _library.gnutls_certificate_get_peers

688

certificate_get_peers.argtypes = [session_t,

689

ctypes.POINTER(ctypes.c_uint)]

690

certificate_get_peers.restype = ctypes.POINTER(datum_t)

691

692

global_set_log_level = _library.gnutls_global_set_log_level

693

global_set_log_level.argtypes = [ctypes.c_int]

694

global_set_log_level.restype = None

695

696

global_set_log_function = _library.gnutls_global_set_log_function

697

global_set_log_function.argtypes = [log_func]

698

global_set_log_function.restype = None

699

700

deinit = _library.gnutls_deinit

701

deinit.argtypes = [session_t]

702

deinit.restype = None

703

704

handshake = _library.gnutls_handshake

705

handshake.argtypes = [session_t]

706

handshake.restype = _error_code

707

handshake.errcheck = _retry_on_error

708

709

transport_set_ptr = _library.gnutls_transport_set_ptr

710

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

711

transport_set_ptr.restype = None

712

713

bye = _library.gnutls_bye

714

bye.argtypes = [session_t, close_request_t]

715

bye.restype = _error_code

716

bye.errcheck = _retry_on_error

717

718

check_version = _library.gnutls_check_version

719

check_version.argtypes = [ctypes.c_char_p]

720

check_version.restype = ctypes.c_char_p

721

722

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

723

724

openpgp_crt_init = _library.gnutls_openpgp_crt_init

725

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

726

openpgp_crt_init.restype = _error_code

727

728

openpgp_crt_import = _library.gnutls_openpgp_crt_import

729

openpgp_crt_import.argtypes = [openpgp_crt_t,

730

ctypes.POINTER(datum_t),

731

openpgp_crt_fmt_t]

732

openpgp_crt_import.restype = _error_code

733

734

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

735

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

736

ctypes.POINTER(ctypes.c_uint)]

737

openpgp_crt_verify_self.restype = _error_code

738

739

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

740

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

741

openpgp_crt_deinit.restype = None

742

743

openpgp_crt_get_fingerprint = (

744

_library.gnutls_openpgp_crt_get_fingerprint)

745

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

746

ctypes.c_void_p,

747

ctypes.POINTER(

748

ctypes.c_size_t)]

749

openpgp_crt_get_fingerprint.restype = _error_code

750

751

# Remove non-public functions

752

del _error_code, _retry_on_error

753

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

754

gnutls = GnuTLS()

755

756

def call_pipe(connection, # : multiprocessing.Connection

757

func, *args, **kwargs):

758

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

759

760

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

761

return value on the provided multiprocessing.Connection.

762

"""

763

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

764

connection.close()

427

765

428

766

class Client(object):

429

767

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

435

773

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

436

774

to see if the client lives.

437

775

'None' if no process is running.

438

checker_callback_tag: a gobject event source tag, or None

776

checker_callback_tag: a GLib event source tag, or None

439

777

checker_command: string; External command which is run to check

440

778

if client lives. %() expansions are done at

441

779

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

442

780

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

443

checker_initiator_tag: a gobject event source tag, or None

781

checker_initiator_tag: a GLib event source tag, or None

444

782

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

445

783

client_structure: Object describing what attributes a client has

446

784

and is used for storing the client at exit

447

785

current_checker_command: string; current running checker_command

448

disable_initiator_tag: a gobject event source tag, or None

786

disable_initiator_tag: a GLib event source tag, or None

449

787

enabled: bool()

450

788

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

451

789

uniquely identify the client

456

794

last_checker_status: integer between 0 and 255 reflecting exit

457

795

status of last checker. -1 reflects crashed

458

796

checker, -2 means no checker completed yet.

797

last_checker_signal: The signal which killed the last checker, if

798

last_checker_status is -1

459

799

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

460

800

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

461

801

D-Bus identifiers

512

852

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

513

853

.replace(" ", ""))

514

854

if "secret" in section:

515

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

855

client["secret"] = codecs.decode(section["secret"]

856

.encode("utf-8"),

857

"base64")

516

858

elif "secfile" in section:

517

859

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

518

860

(section["secfile"])),

571

913

self.changedstate = multiprocessing_manager.Condition(

572

914

multiprocessing_manager.Lock())

573

915

self.client_structure = [attr

574

for attr in self.__dict__.iterkeys()

916

for attr in self.__dict__.keys()

575

917

if not attr.startswith("_")]

576

918

self.client_structure.append("client_structure")

577

919

603

945

if not quiet:

604

946

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

605

947

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

606

gobject.source_remove(self.disable_initiator_tag)

948

GLib.source_remove(self.disable_initiator_tag)

607

949

self.disable_initiator_tag = None

608

950

self.expires = None

609

951

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

610

gobject.source_remove(self.checker_initiator_tag)

952

GLib.source_remove(self.checker_initiator_tag)

611

953

self.checker_initiator_tag = None

612

954

self.stop_checker()

613

955

self.enabled = False

614

956

if not quiet:

615

957

self.send_changedstate()

616

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

958

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

617

959

return False

618

960

619

961

def __del__(self):

623

965

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

624

966

# and every interval from then on.

625

967

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

627

self.checker_initiator_tag = gobject.timeout_add(

968

GLib.source_remove(self.checker_initiator_tag)

969

self.checker_initiator_tag = GLib.timeout_add(

628

970

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

629

971

self.start_checker)

630

972

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

631

973

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

633

self.disable_initiator_tag = gobject.timeout_add(

974

GLib.source_remove(self.disable_initiator_tag)

975

self.disable_initiator_tag = GLib.timeout_add(

634

976

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

635

977

# Also start a new checker *right now*.

636

978

self.start_checker()

637

979

638

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

980

def checker_callback(self, source, condition, connection,

981

command):

639

982

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

640

983

self.checker_callback_tag = None

641

984

self.checker = None

642

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

985

# Read return code from connection (see call_pipe)

986

returncode = connection.recv()

987

connection.close()

988

989

if returncode >= 0:

990

self.last_checker_status = returncode

991

self.last_checker_signal = None

644

992

if self.last_checker_status == 0:

645

993

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

646

994

vars(self))

649

997

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

650

998

else:

651

999

self.last_checker_status = -1

1000

self.last_checker_signal = -returncode

652

1001

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

653

1002

vars(self))

1003

return False

654

1004

655

1005

def checked_ok(self):

656

1006

"""Assert that the client has been seen, alive and well."""

657

1007

self.last_checked_ok = datetime.datetime.utcnow()

658

1008

self.last_checker_status = 0

1009

self.last_checker_signal = None

659

1010

self.bump_timeout()

660

1011

661

1012

def bump_timeout(self, timeout=None):

663

1014

if timeout is None:

664

1015

timeout = self.timeout

665

1016

if self.disable_initiator_tag is not None:

666

gobject.source_remove(self.disable_initiator_tag)

1017

GLib.source_remove(self.disable_initiator_tag)

667

1018

self.disable_initiator_tag = None

668

1019

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

669

self.disable_initiator_tag = gobject.timeout_add(

1020

self.disable_initiator_tag = GLib.timeout_add(

670

1021

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

671

1022

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

672

1023

687

1038

# than 'timeout' for the client to be disabled, which is as it

688

1039

# should be.

689

1040

690

# If a checker exists, make sure it is not a zombie

691

try:

692

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

698

else:

699

if pid:

700

logger.warning("Checker was a zombie")

701

gobject.source_remove(self.checker_callback_tag)

702

self.checker_callback(pid, status,

703

self.current_checker_command)

1041

if self.checker is not None and not self.checker.is_alive():

1042

logger.warning("Checker was not alive; joining")

1043

self.checker.join()

1044

self.checker = None

704

1045

# Start a new checker if needed

705

1046

if self.checker is None:

706

1047

# Escape attributes for the shell

715

1056

exc_info=error)

716

1057

return True # Try again later

717

1058

self.current_checker_command = command

718

try:

719

logger.info("Starting checker %r for %s", command,

720

self.name)

721

# We don't need to redirect stdout and stderr, since

722

# in normal mode, that is already done by daemon(),

723

# and in debug mode we don't want to. (Stdin is

724

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

self.checker = subprocess.Popen(command,

734

close_fds=True,

735

shell=True,

736

cwd="/",

737

**popen_args)

738

except OSError as error:

739

logger.error("Failed to start subprocess",

740

exc_info=error)

741

return True

742

self.checker_callback_tag = gobject.child_watch_add(

743

self.checker.pid, self.checker_callback, data=command)

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

747

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

748

except OSError as error:

749

if error.errno == errno.ECHILD:

750

# This should never happen

751

logger.error("Child process vanished",

752

exc_info=error)

753

return True

754

raise

755

if pid:

756

gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

758

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

1059

logger.info("Starting checker %r for %s", command,

1060

self.name)

1061

# We don't need to redirect stdout and stderr, since

1062

# in normal mode, that is already done by daemon(),

1063

# and in debug mode we don't want to. (Stdin is

1064

# always replaced by /dev/null.)

1065

# The exception is when not debugging but nevertheless

1066

# running in the foreground; use the previously

1067

# created wnull.

1068

popen_args = { "close_fds": True,

1069

"shell": True,

1070

"cwd": "/" }

1071

if (not self.server_settings["debug"]

1072

and self.server_settings["foreground"]):

1073

popen_args.update({"stdout": wnull,

1074

"stderr": wnull })

1075

pipe = multiprocessing.Pipe(duplex = False)

1076

self.checker = multiprocessing.Process(

1077

target = call_pipe,

1078

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

1079

kwargs = popen_args)

1080

self.checker.start()

1081

self.checker_callback_tag = GLib.io_add_watch(

1082

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

1083

self.checker_callback, pipe[0], command)

1084

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

759

1085

return True

760

1086

761

1087

def stop_checker(self):

762

1088

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

763

1089

if self.checker_callback_tag:

764

gobject.source_remove(self.checker_callback_tag)

1090

GLib.source_remove(self.checker_callback_tag)

765

1091

self.checker_callback_tag = None

766

1092

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

767

1093

return

768

1094

logger.debug("Stopping checker for %(name)s", vars(self))

769

try:

770

self.checker.terminate()

771

#time.sleep(0.5)

772

#if self.checker.poll() is None:

773

# self.checker.kill()

774

except OSError as error:

775

if error.errno != errno.ESRCH: # No such process

776

raise

1095

self.checker.terminate()

777

1096

self.checker = None

778

1097

779

1098

843

1162

access="r")

844

1163

def Property_dbus_property(self):

845

1164

return dbus.Boolean(False)

1165

1166

See also the DBusObjectWithAnnotations class.

846

1167

"""

847

1168

848

1169

def decorator(func):

870

1191

pass

871

1192

872

1193

873

class DBusObjectWithProperties(dbus.service.Object):

874

"""A D-Bus object with properties.

1194

class DBusObjectWithAnnotations(dbus.service.Object):

1195

"""A D-Bus object with annotations.

875

1196

876

Classes inheriting from this can use the dbus_service_property

877

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

878

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

1197

Classes inheriting from this can use the dbus_annotations

1198

decorator to add annotations to methods or signals.

879

1199

"""

880

1200

881

1201

@staticmethod

897

1217

for name, athing in

898

1218

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

899

1219

1220

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1221

out_signature = "s",

1222

path_keyword = 'object_path',

1223

connection_keyword = 'connection')

1224

def Introspect(self, object_path, connection):

1225

"""Overloading of standard D-Bus method.

1226

1227

Inserts annotation tags on methods and signals.

1228

"""

1229

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

1230

connection)

1231

try:

1232

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

1233

1234

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

1235

# Add annotation tags

1236

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

1237

for tag in if_tag.getElementsByTagName(typ):

1238

annots = dict()

1239

for name, prop in (self.

1240

_get_all_dbus_things(typ)):

1241

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

1242

and prop._dbus_interface

1243

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

1244

annots.update(getattr(

1245

prop, "_dbus_annotations", {}))

1246

for name, value in annots.items():

1247

ann_tag = document.createElement(

1248

"annotation")

1249

ann_tag.setAttribute("name", name)

1250

ann_tag.setAttribute("value", value)

1251

tag.appendChild(ann_tag)

1252

# Add interface annotation tags

1253

for annotation, value in dict(

1254

itertools.chain.from_iterable(

1255

annotations().items()

1256

for name, annotations

1257

in self._get_all_dbus_things("interface")

1258

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

1259

)).items():

1260

ann_tag = document.createElement("annotation")

1261

ann_tag.setAttribute("name", annotation)

1262

ann_tag.setAttribute("value", value)

1263

if_tag.appendChild(ann_tag)

1264

# Fix argument name for the Introspect method itself

1265

if (if_tag.getAttribute("name")

1266

== dbus.INTROSPECTABLE_IFACE):

1267

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

1268

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

1269

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

1270

if (arg.getAttribute("direction")

1271

== "out"):

1272

arg.setAttribute("name",

1273

"xml_data")

1274

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

1275

document.unlink()

1276

except (AttributeError, xml.dom.DOMException,

1277

xml.parsers.expat.ExpatError) as error:

1278

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

1279

exc_info=error)

1280

return xmlstring

1281

1282

1283

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1284

"""A D-Bus object with properties.

1285

1286

Classes inheriting from this can use the dbus_service_property

1287

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

1288

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

1289

"""

1290

900

1291

def _get_dbus_property(self, interface_name, property_name):

901

1292

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

902

1293

property with the specified name and interface.

912

1303

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

913

1304

self.dbus_object_path, interface_name, property_name))

914

1305

1306

@classmethod

1307

def _get_all_interface_names(cls):

1308

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

1309

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

1310

"_dbus_interface", None)

1311

for x in (inspect.getmro(cls))

1312

for attr in dir(x))

1313

if name is not None)

1314

915

1315

@dbus.service.method(dbus.PROPERTIES_IFACE,

916

1316

in_signature="ss",

917

1317

out_signature="v")

987

1387

988

1388

Inserts property tags and interface annotation tags.

989

1389

"""

990

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

991

connection)

1390

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1391

object_path,

1392

connection)

992

1393

try:

993

1394

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

994

1395

1007

1408

if prop._dbus_interface

1008

1409

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

1009

1410

if_tag.appendChild(tag)

1010

# Add annotation tags

1011

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

1012

for tag in if_tag.getElementsByTagName(typ):

1013

annots = dict()

1014

for name, prop in (self.

1015

_get_all_dbus_things(typ)):

1016

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

1017

and prop._dbus_interface

1018

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

1019

annots.update(getattr(

1020

prop, "_dbus_annotations", {}))

1021

for name, value in annots.items():

1022

ann_tag = document.createElement(

1023

"annotation")

1024

ann_tag.setAttribute("name", name)

1025

ann_tag.setAttribute("value", value)

1026

tag.appendChild(ann_tag)

1027

# Add interface annotation tags

1028

for annotation, value in dict(

1029

itertools.chain.from_iterable(

1030

annotations().items()

1031

for name, annotations

1032

in self._get_all_dbus_things("interface")

1033

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

1034

)).items():

1035

ann_tag = document.createElement("annotation")

1036

ann_tag.setAttribute("name", annotation)

1037

ann_tag.setAttribute("value", value)

1038

if_tag.appendChild(ann_tag)

1411

# Add annotation tags for properties

1412

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

1413

annots = dict()

1414

for name, prop in self._get_all_dbus_things(

1415

"property"):

1416

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

1417

and prop._dbus_interface

1418

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

1419

annots.update(getattr(

1420

prop, "_dbus_annotations", {}))

1421

for name, value in annots.items():

1422

ann_tag = document.createElement(

1423

"annotation")

1424

ann_tag.setAttribute("name", name)

1425

ann_tag.setAttribute("value", value)

1426

tag.appendChild(ann_tag)

1039

1427

# Add the names to the return values for the

1040

1428

# "org.freedesktop.DBus.Properties" methods

1041

1429

if (if_tag.getAttribute("name")

1059

1447

exc_info=error)

1060

1448

return xmlstring

1061

1449

1450

try:

1451

dbus.OBJECT_MANAGER_IFACE

1452

except AttributeError:

1453

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

1454

1455

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1456

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

1457

1458

Classes inheriting from this exposes the standard

1459

GetManagedObjects call and the InterfacesAdded and

1460

InterfacesRemoved signals on the standard

1461

"org.freedesktop.DBus.ObjectManager" interface.

1462

1463

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

1464

manually.

1465

"""

1466

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1467

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

1468

def GetManagedObjects(self):

1469

"""This function must be overridden"""

1470

raise NotImplementedError()

1471

1472

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1473

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

1474

def InterfacesAdded(self, object_path, interfaces_and_properties):

1475

pass

1476

1477

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

1478

def InterfacesRemoved(self, object_path, interfaces):

1479

pass

1480

1481

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1482

out_signature = "s",

1483

path_keyword = 'object_path',

1484

connection_keyword = 'connection')

1485

def Introspect(self, object_path, connection):

1486

"""Overloading of standard D-Bus method.

1487

1488

Override return argument name of GetManagedObjects to be

1489

"objpath_interfaces_and_properties"

1490

"""

1491

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1492

object_path,

1493

connection)

1494

try:

1495

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

1496

1497

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

1498

# Fix argument name for the GetManagedObjects method

1499

if (if_tag.getAttribute("name")

1500

== dbus.OBJECT_MANAGER_IFACE):

1501

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

1502

if (cn.getAttribute("name")

1503

== "GetManagedObjects"):

1504

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

1505

if (arg.getAttribute("direction")

1506

== "out"):

1507

arg.setAttribute(

1508

"name",

1509

"objpath_interfaces"

1510

"_and_properties")

1511

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

1512

document.unlink()

1513

except (AttributeError, xml.dom.DOMException,

1514

xml.parsers.expat.ExpatError) as error:

1515

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

1516

exc_info = error)

1517

return xmlstring

1062

1518

1063

1519

def datetime_to_dbus(dt, variant_level=0):

1064

1520

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

1113

1569

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

1114

1570

# Extract the original non-method undecorated

1115

1571

# function by black magic

1116

nonmethod_func = (dict(

1117

zip(attribute.func_code.co_freevars,

1118

attribute.__closure__))

1119

["func"].cell_contents)

1572

if sys.version_info.major == 2:

1573

nonmethod_func = (dict(

1574

zip(attribute.func_code.co_freevars,

1575

attribute.__closure__))

1576

["func"].cell_contents)

1577

else:

1578

nonmethod_func = (dict(

1579

zip(attribute.__code__.co_freevars,

1580

attribute.__closure__))

1581

["func"].cell_contents)

1120

1582

# Create a new, but exactly alike, function

1121

1583

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

1122

1584

# with the alternate D-Bus interface name

1585

new_function = copy_function(nonmethod_func)

1123

1586

new_function = (dbus.service.signal(

1124

alt_interface, attribute._dbus_signature)

1125

(types.FunctionType(

1126

nonmethod_func.func_code,

1127

nonmethod_func.func_globals,

1128

nonmethod_func.func_name,

1129

nonmethod_func.func_defaults,

1130

nonmethod_func.func_closure)))

1587

alt_interface,

1588

attribute._dbus_signature)(new_function))

1131

1589

# Copy annotations, if any

1132

1590

try:

1133

1591

new_function._dbus_annotations = dict(

1143

1601

func1 and func2 to the "call_both" function

1144

1602

outside of its arguments"""

1145

1603

1604

@functools.wraps(func2)

1146

1605

def call_both(*args, **kwargs):

1147

1606

"""This function will emit two D-Bus

1148

1607

signals by calling func1 and func2"""

1149

1608

func1(*args, **kwargs)

1150

1609

func2(*args, **kwargs)

1610

# Make wrapper function look like a D-Bus signal

1611

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

1612

if name.startswith("_dbus_"):

1613

setattr(call_both, name, attr)

1151

1614

1152

1615

return call_both

1153

1616

# Create the "call_both" function and add it to

1164

1627

alt_interface,

1165

1628

attribute._dbus_in_signature,

1166

1629

attribute._dbus_out_signature)

1167

(types.FunctionType(attribute.func_code,

1168

attribute.func_globals,

1169

attribute.func_name,

1170

attribute.func_defaults,

1171

attribute.func_closure)))

1630

(copy_function(attribute)))

1172

1631

# Copy annotations, if any

1173

1632

try:

1174

1633

attr[attrname]._dbus_annotations = dict(

1186

1645

attribute._dbus_access,

1187

1646

attribute._dbus_get_args_options

1188

1647

["byte_arrays"])

1189

(types.FunctionType(

1190

attribute.func_code,

1191

attribute.func_globals,

1192

attribute.func_name,

1193

attribute.func_defaults,

1194

attribute.func_closure)))

1648

(copy_function(attribute)))

1195

1649

# Copy annotations, if any

1196

1650

try:

1197

1651

attr[attrname]._dbus_annotations = dict(

1206

1660

# to the class.

1207

1661

attr[attrname] = (

1208

1662

dbus_interface_annotations(alt_interface)

1209

(types.FunctionType(attribute.func_code,

1210

attribute.func_globals,

1211

attribute.func_name,

1212

attribute.func_defaults,

1213

attribute.func_closure)))

1663

(copy_function(attribute)))

1214

1664

if deprecate:

1215

1665

# Deprecate all alternate interfaces

1216

1666

iname="_AlternateDBusNames_interface_annotation{}"

1229

1679

if interface_names:

1230

1680

# Replace the class with a new subclass of it with

1231

1681

# methods, signals, etc. as created above.

1232

cls = type(b"{}Alternate".format(cls.__name__),

1233

(cls, ), attr)

1682

if sys.version_info.major == 2:

1683

cls = type(b"{}Alternate".format(cls.__name__),

1684

(cls, ), attr)

1685

else:

1686

cls = type("{}Alternate".format(cls.__name__),

1687

(cls, ), attr)

1234

1688

return cls

1235

1689

1236

1690

return wrapper

1356

1810

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

1357

1811

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

1358

1812

1359

def checker_callback(self, pid, condition, command,

1360

*args, **kwargs):

1361

self.checker_callback_tag = None

1362

self.checker = None

1363

if os.WIFEXITED(condition):

1364

exitstatus = os.WEXITSTATUS(condition)

1813

def checker_callback(self, source, condition,

1814

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

1815

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

1816

connection, command, *args,

1817

**kwargs)

1818

exitstatus = self.last_checker_status

1819

if exitstatus >= 0:

1365

1820

# Emit D-Bus signal

1366

1821

self.CheckerCompleted(dbus.Int16(exitstatus),

1367

dbus.Int64(condition),

1822

# This is specific to GNU libC

1823

dbus.Int64(exitstatus << 8),

1368

1824

dbus.String(command))

1369

1825

else:

1370

1826

# Emit D-Bus signal

1371

1827

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

1372

dbus.Int64(condition),

1828

dbus.Int64(

1829

# This is specific to GNU libC

1830

(exitstatus << 8)

1831

| self.last_checker_signal),

1373

1832

dbus.String(command))

1374

1375

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

1376

*args, **kwargs)

1833

return ret

1377

1834

1378

1835

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

1379

1836

old_checker_pid = getattr(self.checker, "pid", None)

1391

1848

1392

1849

def approve(self, value=True):

1393

1850

self.approved = value

1394

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

1395

* 1000), self._reset_approved)

1851

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

1852

* 1000), self._reset_approved)

1396

1853

self.send_changedstate()

1397

1854

1398

1855

## D-Bus methods, signals & properties

1454

1911

self.checked_ok()

1455

1912

1456

1913

# Enable - method

1914

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

1457

1915

@dbus.service.method(_interface)

1458

1916

def Enable(self):

1459

1917

"D-Bus method"

1460

1918

self.enable()

1461

1919

1462

1920

# StartChecker - method

1921

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

1463

1922

@dbus.service.method(_interface)

1464

1923

def StartChecker(self):

1465

1924

"D-Bus method"

1466

1925

self.start_checker()

1467

1926

1468

1927

# Disable - method

1928

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

1469

1929

@dbus.service.method(_interface)

1470

1930

def Disable(self):

1471

1931

"D-Bus method"

1472

1932

self.disable()

1473

1933

1474

1934

# StopChecker - method

1935

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

1475

1936

@dbus.service.method(_interface)

1476

1937

def StopChecker(self):

1477

1938

self.stop_checker()

1513

1974

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

1514

1975

1515

1976

# Name - property

1977

@dbus_annotations(

1978

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

1516

1979

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

1517

1980

def Name_dbus_property(self):

1518

1981

return dbus.String(self.name)

1519

1982

1520

1983

# Fingerprint - property

1984

@dbus_annotations(

1985

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

1521

1986

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

1522

1987

def Fingerprint_dbus_property(self):

1523

1988

return dbus.String(self.fingerprint)

1532

1997

self.host = str(value)

1533

1998

1534

1999

# Created - property

2000

@dbus_annotations(

2001

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

1535

2002

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

1536

2003

def Created_dbus_property(self):

1537

2004

return datetime_to_dbus(self.created)

1598

2065

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

1599

2066

is None):

1600

2067

return

1601

gobject.source_remove(self.disable_initiator_tag)

1602

self.disable_initiator_tag = gobject.timeout_add(

2068

GLib.source_remove(self.disable_initiator_tag)

2069

self.disable_initiator_tag = GLib.timeout_add(

1603

2070

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

1604

2071

self.disable)

1605

2072

1625

2092

return

1626

2093

if self.enabled:

1627

2094

# Reschedule checker run

1628

gobject.source_remove(self.checker_initiator_tag)

1629

self.checker_initiator_tag = gobject.timeout_add(

2095

GLib.source_remove(self.checker_initiator_tag)

2096

self.checker_initiator_tag = GLib.timeout_add(

1630

2097

value, self.start_checker)

1631

2098

self.start_checker() # Start one now, too

1632

2099

1652

2119

self.stop_checker()

1653

2120

1654

2121

# ObjectPath - property

2122

@dbus_annotations(

2123

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

2124

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

1655

2125

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

1656

2126

def ObjectPath_dbus_property(self):

1657

2127

return self.dbus_object_path # is already a dbus.ObjectPath

1658

2128

1659

2129

# Secret = property

2130

@dbus_annotations(

2131

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

2132

"invalidates"})

1660

2133

@dbus_service_property(_interface,

1661

2134

signature="ay",

1662

2135

access="write",

1708

2181

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

1709

2182

self.server.child_pipe.fileno())

1710

2183

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.

2184

session = gnutls.ClientSession(self.request)

1718

2185

1719

2186

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

1720

2187

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

1724

2191

priority = self.server.gnutls_priority

1725

2192

if priority is None:

1726

2193

priority = "NORMAL"

1727

gnutls.library.functions.gnutls_priority_set_direct(

1728

session._c_object, priority, None)

2194

gnutls.priority_set_direct(session._c_object,

2195

priority.encode("utf-8"),

2196

None)

1729

2197

1730

2198

# Start communication using the Mandos protocol

1731

2199

# Get protocol number

1741

2209

# Start GnuTLS connection

1742

2210

try:

1743

2211

session.handshake()

1744

except gnutls.errors.GNUTLSError as error:

2212

except gnutls.Error as error:

1745

2213

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

1746

2214

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

1747

2215

# established. Just abandon the request.

1753

2221

try:

1754

2222

fpr = self.fingerprint(

1755

2223

self.peer_certificate(session))

1756

except (TypeError,

1757

gnutls.errors.GNUTLSError) as error:

2224

except (TypeError, gnutls.Error) as error:

1758

2225

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

1759

2226

return

1760

2227

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

1818

2285

else:

1819

2286

delay -= time2 - time

1820

2287

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

2288

try:

2289

session.send(client.secret)

2290

except gnutls.Error as error:

2291

logger.warning("gnutls send failed",

2292

exc_info = error)

2293

return

1833

2294

1834

2295

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

1835

2296

# bump the timeout using extended_timeout

1843

2304

client.approvals_pending -= 1

1844

2305

try:

1845

2306

session.bye()

1846

except gnutls.errors.GNUTLSError as error:

2307

except gnutls.Error as error:

1847

2308

logger.warning("GnuTLS bye failed",

1848

2309

exc_info=error)

1849

2310

1851

2312

def peer_certificate(session):

1852

2313

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

1853

2314

# 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

2315

if (gnutls.certificate_type_get(session._c_object)

2316

!= gnutls.CRT_OPENPGP):

2317

# ...return invalid data

2318

return b""

1859

2319

list_size = ctypes.c_uint(1)

1860

cert_list = (gnutls.library.functions

1861

.gnutls_certificate_get_peers

2320

cert_list = (gnutls.certificate_get_peers

1862

2321

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

1863

2322

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

1864

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

1865

" certificate")

2323

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

1866

2324

if list_size.value == 0:

1867

2325

return None

1868

2326

cert = cert_list[0]

1872

2330

def fingerprint(openpgp):

1873

2331

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1874

2332

# New GnuTLS "datum" with the OpenPGP public key

1875

datum = gnutls.library.types.gnutls_datum_t(

2333

datum = gnutls.datum_t(

1876

2334

ctypes.cast(ctypes.c_char_p(openpgp),

1877

2335

ctypes.POINTER(ctypes.c_ubyte)),

1878

2336

ctypes.c_uint(len(openpgp)))

1879

2337

# 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))

2338

crt = gnutls.openpgp_crt_t()

2339

gnutls.openpgp_crt_init(ctypes.byref(crt))

1883

2340

# 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)

2341

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

2342

gnutls.OPENPGP_FMT_RAW)

1887

2343

# Verify the self signature in the key

1888

2344

crtverify = ctypes.c_uint()

1889

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1890

crt, 0, ctypes.byref(crtverify))

2345

gnutls.openpgp_crt_verify_self(crt, 0,

2346

ctypes.byref(crtverify))

1891

2347

if crtverify.value != 0:

1892

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1893

raise gnutls.errors.CertificateSecurityError(

1894

"Verify failed")

2348

gnutls.openpgp_crt_deinit(crt)

2349

raise gnutls.CertificateSecurityError("Verify failed")

1895

2350

# New buffer for the fingerprint

1896

2351

buf = ctypes.create_string_buffer(20)

1897

2352

buf_len = ctypes.c_size_t()

1898

2353

# 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))

2354

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

2355

ctypes.byref(buf_len))

1901

2356

# Deinit the certificate

1902

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2357

gnutls.openpgp_crt_deinit(crt)

1903

2358

# Convert the buffer to a Python bytestring

1904

2359

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

1905

2360

# Convert the bytestring to hexadecimal notation

2000

2455

bind to an address or port if they were not specified."""

2001

2456

if self.interface is not None:

2002

2457

if SO_BINDTODEVICE is None:

2003

logger.error("SO_BINDTODEVICE does not exist;"

2004

" cannot bind to interface %s",

2005

self.interface)

2006

else:

2007

try:

2008

self.socket.setsockopt(

2009

socket.SOL_SOCKET, SO_BINDTODEVICE,

2010

(self.interface + "\0").encode("utf-8"))

2011

except socket.error as error:

2012

if error.errno == errno.EPERM:

2013

logger.error("No permission to bind to"

2014

" interface %s", self.interface)

2015

elif error.errno == errno.ENOPROTOOPT:

2016

logger.error("SO_BINDTODEVICE not available;"

2017

" cannot bind to interface %s",

2018

self.interface)

2019

elif error.errno == errno.ENODEV:

2020

logger.error("Interface %s does not exist,"

2021

" cannot bind", self.interface)

2022

else:

2023

raise

2458

# Fall back to a hard-coded value which seems to be

2459

# common enough.

2460

logger.warning("SO_BINDTODEVICE not found, trying 25")

2461

SO_BINDTODEVICE = 25

2462

try:

2463

self.socket.setsockopt(

2464

socket.SOL_SOCKET, SO_BINDTODEVICE,

2465

(self.interface + "\0").encode("utf-8"))

2466

except socket.error as error:

2467

if error.errno == errno.EPERM:

2468

logger.error("No permission to bind to"

2469

" interface %s", self.interface)

2470

elif error.errno == errno.ENOPROTOOPT:

2471

logger.error("SO_BINDTODEVICE not available;"

2472

" cannot bind to interface %s",

2473

self.interface)

2474

elif error.errno == errno.ENODEV:

2475

logger.error("Interface %s does not exist,"

2476

" cannot bind", self.interface)

2477

else:

2478

raise

2024

2479

# Only bind(2) the socket if we really need to.

2025

2480

if self.server_address[0] or self.server_address[1]:

2026

2481

if not self.server_address[0]:

2049

2504

gnutls_priority GnuTLS priority string

2050

2505

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

2051

2506

2052

Assumes a gobject.MainLoop event loop.

2507

Assumes a GLib.MainLoop event loop.

2053

2508

"""

2054

2509

2055

2510

def __init__(self, server_address, RequestHandlerClass,

2080

2535

2081

2536

def add_pipe(self, parent_pipe, proc):

2082

2537

# Call "handle_ipc" for both data and EOF events

2083

gobject.io_add_watch(

2538

GLib.io_add_watch(

2084

2539

parent_pipe.fileno(),

2085

gobject.IO_IN | gobject.IO_HUP,

2540

GLib.IO_IN | GLib.IO_HUP,

2086

2541

functools.partial(self.handle_ipc,

2087

2542

parent_pipe = parent_pipe,

2088

2543

proc = proc))

2092

2547

proc = None,

2093

2548

client_object=None):

2094

2549

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

2095

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

2550

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

2096

2551

# Wait for other process to exit

2097

2552

proc.join()

2098

2553

return False

2105

2560

fpr = request[1]

2106

2561

address = request[2]

2107

2562

2108

for c in self.clients.itervalues():

2563

for c in self.clients.values():

2109

2564

if c.fingerprint == fpr:

2110

2565

client = c

2111

2566

break

2119

2574

parent_pipe.send(False)

2120

2575

return False

2121

2576

2122

gobject.io_add_watch(

2577

GLib.io_add_watch(

2123

2578

parent_pipe.fileno(),

2124

gobject.IO_IN | gobject.IO_HUP,

2579

GLib.IO_IN | GLib.IO_HUP,

2125

2580

functools.partial(self.handle_ipc,

2126

2581

parent_pipe = parent_pipe,

2127

2582

proc = proc,

2141

2596

2142

2597

if command == 'getattr':

2143

2598

attrname = request[1]

2144

if callable(client_object.__getattribute__(attrname)):

2599

if isinstance(client_object.__getattribute__(attrname),

2600

collections.Callable):

2145

2601

parent_pipe.send(('function', ))

2146

2602

else:

2147

2603

parent_pipe.send((

2385

2841

"debug": "False",

2386

2842

"priority":

2387

2843

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

2388

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

2844

":+SIGN-DSA-SHA256",

2389

2845

"servicename": "Mandos",

2390

2846

"use_dbus": "True",

2391

2847

"use_ipv6": "True",

2508

2964

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

2509

2965

exc_info=e)

2510

2966

2511

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

2967

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

2968

("mandos", "mandos"),

2969

("nobody", "nogroup")):

2512

2970

try:

2513

2971

uid = pwd.getpwnam(name).pw_uid

2514

gid = pwd.getpwnam(name).pw_gid

2972

gid = pwd.getpwnam(group).pw_gid

2515

2973

break

2516

2974

except KeyError:

2517

2975

continue

2521

2979

try:

2522

2980

os.setgid(gid)

2523

2981

os.setuid(uid)

2982

if debug:

2983

logger.debug("Did setuid/setgid to {}:{}".format(uid,

2984

gid))

2524

2985

except OSError as error:

2986

logger.warning("Failed to setuid/setgid to {}:{}: {}"

2987

.format(uid, gid, os.strerror(error.errno)))

2525

2988

if error.errno != errno.EPERM:

2526

2989

raise

2527

2990

2530

2993

2531

2994

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

2532

2995

# - GnuTLS manual

2533

gnutls.library.functions.gnutls_global_set_log_level(11)

2996

gnutls.global_set_log_level(11)

2534

2997

2535

@gnutls.library.types.gnutls_log_func

2998

@gnutls.log_func

2536

2999

def debug_gnutls(level, string):

2537

3000

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

2538

3001

2539

gnutls.library.functions.gnutls_global_set_log_function(

2540

debug_gnutls)

3002

gnutls.global_set_log_function(debug_gnutls)

2541

3003

2542

3004

# Redirect stdin so all checkers get /dev/null

2543

3005

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

2550

3012

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

2551

3013

daemon()

2552

3014

2553

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

2554

# need to inform gobject that threads will be used.

2555

gobject.threads_init()

3015

# multiprocessing will use threads, so before we use GLib we need

3016

# to inform GLib that threads will be used.

3017

GLib.threads_init()

2556

3018

2557

3019

global main_loop

2558

3020

# From the Avahi example code

2559

3021

DBusGMainLoop(set_as_default=True)

2560

main_loop = gobject.MainLoop()

3022

main_loop = GLib.MainLoop()

2561

3023

bus = dbus.SystemBus()

2562

3024

# End of Avahi example code

2563

3025

if use_dbus:

2607

3069

if server_settings["restore"]:

2608

3070

try:

2609

3071

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

2610

clients_data, old_client_settings = pickle.load(

2611

stored_state)

3072

if sys.version_info.major == 2:

3073

clients_data, old_client_settings = pickle.load(

3074

stored_state)

3075

else:

3076

bytes_clients_data, bytes_old_client_settings = (

3077

pickle.load(stored_state, encoding = "bytes"))

3078

### Fix bytes to strings

3079

## clients_data

3080

# .keys()

3081

clients_data = { (key.decode("utf-8")

3082

if isinstance(key, bytes)

3083

else key): value

3084

for key, value in

3085

bytes_clients_data.items() }

3086

del bytes_clients_data

3087

for key in clients_data:

3088

value = { (k.decode("utf-8")

3089

if isinstance(k, bytes) else k): v

3090

for k, v in

3091

clients_data[key].items() }

3092

clients_data[key] = value

3093

# .client_structure

3094

value["client_structure"] = [

3095

(s.decode("utf-8")

3096

if isinstance(s, bytes)

3097

else s) for s in

3098

value["client_structure"] ]

3099

# .name & .host

3100

for k in ("name", "host"):

3101

if isinstance(value[k], bytes):

3102

value[k] = value[k].decode("utf-8")

3103

## old_client_settings

3104

# .keys()

3105

old_client_settings = {

3106

(key.decode("utf-8")

3107

if isinstance(key, bytes)

3108

else key): value

3109

for key, value in

3110

bytes_old_client_settings.items() }

3111

del bytes_old_client_settings

3112

# .host

3113

for value in old_client_settings.values():

3114

if isinstance(value["host"], bytes):

3115

value["host"] = (value["host"]

3116

.decode("utf-8"))

2612

3117

os.remove(stored_state_path)

2613

3118

except IOError as e:

2614

3119

if e.errno == errno.ENOENT:

2647

3152

pass

2648

3153

2649

3154

# Clients who has passed its expire date can still be

2650

# enabled if its last checker was successful. Clients

3155

# enabled if its last checker was successful. A Client

2651

3156

# whose checker succeeded before we stored its state is

2652

3157

# assumed to have successfully run all checkers during

2653

3158

# downtime.

2715

3220

del pidfile

2716

3221

del pidfilename

2717

3222

2718

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

2719

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

3223

for termsig in (signal.SIGHUP, signal.SIGTERM):

3224

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3225

lambda: main_loop.quit() and False)

2720

3226

2721

3227

if use_dbus:

2722

3228

2723

3229

@alternate_dbus_interfaces(

2724

3230

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

2725

class MandosDBusService(DBusObjectWithProperties):

3231

class MandosDBusService(DBusObjectWithObjectManager):

2726

3232

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

2727

3233

2728

3234

def __init__(self):

2730

3236

2731

3237

_interface = "se.recompile.Mandos"

2732

3238

2733

@dbus_interface_annotations(_interface)

2734

def _foo(self):

2735

return {

2736

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

2737

"false" }

2738

2739

3239

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

2740

3240

def ClientAdded(self, objpath):

2741

3241

"D-Bus signal"

2746

3246

"D-Bus signal"

2747

3247

pass

2748

3248

3249

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

3250

"true"})

2749

3251

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

2750

3252

def ClientRemoved(self, objpath, name):

2751

3253

"D-Bus signal"

2752

3254

pass

2753

3255

3256

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

3257

"true"})

2754

3258

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

2755

3259

def GetAllClients(self):

2756

3260

"D-Bus method"

2757

3261

return dbus.Array(c.dbus_object_path for c in

2758

tcp_server.clients.itervalues())

3262

tcp_server.clients.values())

2759

3263

3264

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

3265

"true"})

2760

3266

@dbus.service.method(_interface,

2761

3267

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

2762

3268

def GetAllClientsWithProperties(self):

2763

3269

"D-Bus method"

2764

3270

return dbus.Dictionary(

2765

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

2766

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

3271

{ c.dbus_object_path: c.GetAll(

3272

"se.recompile.Mandos.Client")

3273

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

2767

3274

signature="oa{sv}")

2768

3275

2769

3276

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

2770

3277

def RemoveClient(self, object_path):

2771

3278

"D-Bus method"

2772

for c in tcp_server.clients.itervalues():

3279

for c in tcp_server.clients.values():

2773

3280

if c.dbus_object_path == object_path:

2774

3281

del tcp_server.clients[c.name]

2775

3282

c.remove_from_connection()

2776

# Don't signal anything except ClientRemoved

3283

# Don't signal the disabling

2777

3284

c.disable(quiet=True)

2778

# Emit D-Bus signal

2779

self.ClientRemoved(object_path, c.name)

3285

# Emit D-Bus signal for removal

3286

self.client_removed_signal(c)

2780

3287

return

2781

3288

raise KeyError(object_path)

2782

3289

2783

3290

del _interface

3291

3292

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3293

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

3294

def GetManagedObjects(self):

3295

"""D-Bus method"""

3296

return dbus.Dictionary(

3297

{ client.dbus_object_path:

3298

dbus.Dictionary(

3299

{ interface: client.GetAll(interface)

3300

for interface in

3301

client._get_all_interface_names()})

3302

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

3303

3304

def client_added_signal(self, client):

3305

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

3306

if use_dbus:

3307

# New standard signal

3308

self.InterfacesAdded(

3309

client.dbus_object_path,

3310

dbus.Dictionary(

3311

{ interface: client.GetAll(interface)

3312

for interface in

3313

client._get_all_interface_names()}))

3314

# Old signal

3315

self.ClientAdded(client.dbus_object_path)

3316

3317

def client_removed_signal(self, client):

3318

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

3319

if use_dbus:

3320

# New standard signal

3321

self.InterfacesRemoved(

3322

client.dbus_object_path,

3323

client._get_all_interface_names())

3324

# Old signal

3325

self.ClientRemoved(client.dbus_object_path,

3326

client.name)

2784

3327

2785

3328

mandos_dbus_service = MandosDBusService()

2786

3329

3330

# Save modules to variables to exempt the modules from being

3331

# unloaded before the function registered with atexit() is run.

3332

mp = multiprocessing

3333

wn = wnull

2787

3334

def cleanup():

2788

3335

"Cleanup function; run on exit"

2789

3336

if zeroconf:

2790

3337

service.cleanup()

2791

3338

2792

multiprocessing.active_children()

2793

wnull.close()

3339

mp.active_children()

3340

wn.close()

2794

3341

if not (tcp_server.clients or client_settings):

2795

3342

return

2796

3343

2799

3346

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

2800

3347

clients = {}

2801

3348

with PGPEngine() as pgp:

2802

for client in tcp_server.clients.itervalues():

3349

for client in tcp_server.clients.values():

2803

3350

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

2804

3351

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

2805

3352

key)

2829

3376

prefix='clients-',

2830

3377

dir=os.path.dirname(stored_state_path),

2831

3378

delete=False) as stored_state:

2832

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

3379

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

3380

protocol = 2)

2833

3381

tempname = stored_state.name

2834

3382

os.rename(tempname, stored_state_path)

2835

3383

except (IOError, OSError) as e:

2851

3399

name, client = tcp_server.clients.popitem()

2852

3400

if use_dbus:

2853

3401

client.remove_from_connection()

2854

# Don't signal anything except ClientRemoved

3402

# Don't signal the disabling

2855

3403

client.disable(quiet=True)

3404

# Emit D-Bus signal for removal

2856

3405

if use_dbus:

2857

# Emit D-Bus signal

2858

mandos_dbus_service.ClientRemoved(

2859

client.dbus_object_path, client.name)

3406

mandos_dbus_service.client_removed_signal(client)

2860

3407

client_settings.clear()

2861

3408

2862

3409

atexit.register(cleanup)

2863

3410

2864

for client in tcp_server.clients.itervalues():

3411

for client in tcp_server.clients.values():

2865

3412

if use_dbus:

2866

# Emit D-Bus signal

2867

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3413

# Emit D-Bus signal for adding

3414

mandos_dbus_service.client_added_signal(client)

2868

3415

# Need to initiate checking of clients

2869

3416

if client.enabled:

2870

3417

client.init_checker()

2896

3443

sys.exit(1)

2897

3444

# End of Avahi example code

2898

3445

2899

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

2900

lambda *args, **kwargs:

2901

(tcp_server.handle_request

2902

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

3446

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

3447

lambda *args, **kwargs:

3448

(tcp_server.handle_request

3449

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

2903

3450

2904

3451

logger.debug("Starting main loop")

2905

3452

main_loop.run()