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  • Committer: Teddy Hogeborn
  • Date: 2018-08-19 14:58:40 UTC
  • Revision ID: teddy@recompile.se-20180819145840-s1a3xar41lyoq4ty
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* initramfs-tools-script-stop: Did "chmod +x".
* mandos-to-cryptroot-unlock: - '' -

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Lines of Context:
mandos
11
11
# "AvahiService" class, and some lines in "main".
12
12
#
13
13
# Everything else is
14
 
# Copyright © 2008-2019 Teddy Hogeborn
15
 
# Copyright © 2008-2019 Björn Påhlsson
 
14
# Copyright © 2008-2018 Teddy Hogeborn
 
15
# Copyright © 2008-2018 Björn Påhlsson
16
16
#
17
17
# This file is part of Mandos.
18
18
#
115
115
if sys.version_info.major == 2:
116
116
    str = unicode
117
117
 
118
 
version = "1.8.3"
 
118
version = "1.7.19"
119
119
stored_state_file = "clients.pickle"
120
120
 
121
121
logger = logging.getLogger()
275
275
 
276
276
 
277
277
# Pretend that we have an Avahi module
278
 
class avahi(object):
279
 
    """This isn't so much a class as it is a module-like namespace."""
 
278
class Avahi(object):
 
279
    """This isn't so much a class as it is a module-like namespace.
 
280
    It is instantiated once, and simulates having an Avahi module."""
280
281
    IF_UNSPEC = -1               # avahi-common/address.h
281
282
    PROTO_UNSPEC = -1            # avahi-common/address.h
282
283
    PROTO_INET = 0               # avahi-common/address.h
286
287
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
287
288
    DBUS_PATH_SERVER = "/"
288
289
 
289
 
    @staticmethod
290
 
    def string_array_to_txt_array(t):
 
290
    def string_array_to_txt_array(self, t):
291
291
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
292
292
                           for s in t), signature="ay")
293
293
    ENTRY_GROUP_ESTABLISHED = 2  # avahi-common/defs.h
298
298
    SERVER_RUNNING = 2           # avahi-common/defs.h
299
299
    SERVER_COLLISION = 3         # avahi-common/defs.h
300
300
    SERVER_FAILURE = 4           # avahi-common/defs.h
 
301
avahi = Avahi()
301
302
 
302
303
 
303
304
class AvahiError(Exception):
503
504
 
504
505
 
505
506
# Pretend that we have a GnuTLS module
506
 
class gnutls(object):
507
 
    """This isn't so much a class as it is a module-like namespace."""
 
507
class GnuTLS(object):
 
508
    """This isn't so much a class as it is a module-like namespace.
 
509
    It is instantiated once, and simulates having a GnuTLS module."""
508
510
 
509
511
    library = ctypes.util.find_library("gnutls")
510
512
    if library is None:
511
513
        library = ctypes.util.find_library("gnutls-deb0")
512
514
    _library = ctypes.cdll.LoadLibrary(library)
513
515
    del library
 
516
    _need_version = b"3.3.0"
 
517
 
 
518
    def __init__(self):
 
519
        # Need to use "self" here, since this method is called before
 
520
        # the assignment to the "gnutls" global variable happens.
 
521
        if self.check_version(self._need_version) is None:
 
522
            raise self.Error("Needs GnuTLS {} or later"
 
523
                             .format(self._need_version))
514
524
 
515
525
    # Unless otherwise indicated, the constants and types below are
516
526
    # all from the gnutls/gnutls.h C header file.
520
530
    E_INTERRUPTED = -52
521
531
    E_AGAIN = -28
522
532
    CRT_OPENPGP = 2
523
 
    CRT_RAWPK = 3
524
533
    CLIENT = 2
525
534
    SHUT_RDWR = 0
526
535
    CRD_CERTIFICATE = 1
527
536
    E_NO_CERTIFICATE_FOUND = -49
528
 
    X509_FMT_DER = 0
529
 
    NO_TICKETS = 1<<10
530
 
    ENABLE_RAWPK = 1<<18
531
 
    CTYPE_PEERS = 3
532
 
    KEYID_USE_SHA256 = 1        # gnutls/x509.h
533
537
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
534
538
 
535
539
    # Types
558
562
 
559
563
    # Exceptions
560
564
    class Error(Exception):
 
565
        # We need to use the class name "GnuTLS" here, since this
 
566
        # exception might be raised from within GnuTLS.__init__,
 
567
        # which is called before the assignment to the "gnutls"
 
568
        # global variable has happened.
561
569
        def __init__(self, message=None, code=None, args=()):
562
570
            # Default usage is by a message string, but if a return
563
571
            # code is passed, convert it to a string with
564
572
            # gnutls.strerror()
565
573
            self.code = code
566
574
            if message is None and code is not None:
567
 
                message = gnutls.strerror(code)
568
 
            return super(gnutls.Error, self).__init__(
 
575
                message = GnuTLS.strerror(code)
 
576
            return super(GnuTLS.Error, self).__init__(
569
577
                message, *args)
570
578
 
571
579
    class CertificateSecurityError(Error):
585
593
    class ClientSession(object):
586
594
        def __init__(self, socket, credentials=None):
587
595
            self._c_object = gnutls.session_t()
588
 
            gnutls_flags = gnutls.CLIENT
589
 
            if gnutls.check_version("3.5.6"):
590
 
                gnutls_flags |= gnutls.NO_TICKETS
591
 
            if gnutls.has_rawpk:
592
 
                gnutls_flags |= gnutls.ENABLE_RAWPK
593
 
            gnutls.init(ctypes.byref(self._c_object), gnutls_flags)
594
 
            del gnutls_flags
 
596
            gnutls.init(ctypes.byref(self._c_object), gnutls.CLIENT)
595
597
            gnutls.set_default_priority(self._c_object)
596
598
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
597
599
            gnutls.handshake_set_private_extensions(self._c_object,
729
731
    check_version.argtypes = [ctypes.c_char_p]
730
732
    check_version.restype = ctypes.c_char_p
731
733
 
732
 
    _need_version = b"3.3.0"
733
 
    if check_version(_need_version) is None:
734
 
        raise self.Error("Needs GnuTLS {} or later"
735
 
                         .format(_need_version))
736
 
 
737
 
    _tls_rawpk_version = b"3.6.6"
738
 
    has_rawpk = bool(check_version(_tls_rawpk_version))
739
 
 
740
 
    if has_rawpk:
741
 
        # Types
742
 
        class pubkey_st(ctypes.Structure):
743
 
            _fields = []
744
 
        pubkey_t = ctypes.POINTER(pubkey_st)
745
 
 
746
 
        x509_crt_fmt_t = ctypes.c_int
747
 
 
748
 
        # All the function declarations below are from gnutls/abstract.h
749
 
        pubkey_init = _library.gnutls_pubkey_init
750
 
        pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]
751
 
        pubkey_init.restype = _error_code
752
 
 
753
 
        pubkey_import = _library.gnutls_pubkey_import
754
 
        pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),
755
 
                                  x509_crt_fmt_t]
756
 
        pubkey_import.restype = _error_code
757
 
 
758
 
        pubkey_get_key_id = _library.gnutls_pubkey_get_key_id
759
 
        pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,
760
 
                                      ctypes.POINTER(ctypes.c_ubyte),
761
 
                                      ctypes.POINTER(ctypes.c_size_t)]
762
 
        pubkey_get_key_id.restype = _error_code
763
 
 
764
 
        pubkey_deinit = _library.gnutls_pubkey_deinit
765
 
        pubkey_deinit.argtypes = [pubkey_t]
766
 
        pubkey_deinit.restype = None
767
 
    else:
768
 
        # All the function declarations below are from gnutls/openpgp.h
769
 
 
770
 
        openpgp_crt_init = _library.gnutls_openpgp_crt_init
771
 
        openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
772
 
        openpgp_crt_init.restype = _error_code
773
 
 
774
 
        openpgp_crt_import = _library.gnutls_openpgp_crt_import
775
 
        openpgp_crt_import.argtypes = [openpgp_crt_t,
776
 
                                       ctypes.POINTER(datum_t),
777
 
                                       openpgp_crt_fmt_t]
778
 
        openpgp_crt_import.restype = _error_code
779
 
 
780
 
        openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
781
 
        openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
782
 
                                            ctypes.POINTER(ctypes.c_uint)]
783
 
        openpgp_crt_verify_self.restype = _error_code
784
 
 
785
 
        openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
786
 
        openpgp_crt_deinit.argtypes = [openpgp_crt_t]
787
 
        openpgp_crt_deinit.restype = None
788
 
 
789
 
        openpgp_crt_get_fingerprint = (
790
 
            _library.gnutls_openpgp_crt_get_fingerprint)
791
 
        openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
792
 
                                                ctypes.c_void_p,
793
 
                                                ctypes.POINTER(
794
 
                                                    ctypes.c_size_t)]
795
 
        openpgp_crt_get_fingerprint.restype = _error_code
796
 
 
797
 
    if check_version("3.6.4"):
798
 
        certificate_type_get2 = _library.gnutls_certificate_type_get2
799
 
        certificate_type_get2.argtypes = [session_t, ctypes.c_int]
800
 
        certificate_type_get2.restype = _error_code
 
734
    # All the function declarations below are from gnutls/openpgp.h
 
735
 
 
736
    openpgp_crt_init = _library.gnutls_openpgp_crt_init
 
737
    openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
 
738
    openpgp_crt_init.restype = _error_code
 
739
 
 
740
    openpgp_crt_import = _library.gnutls_openpgp_crt_import
 
741
    openpgp_crt_import.argtypes = [openpgp_crt_t,
 
742
                                   ctypes.POINTER(datum_t),
 
743
                                   openpgp_crt_fmt_t]
 
744
    openpgp_crt_import.restype = _error_code
 
745
 
 
746
    openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
 
747
    openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
 
748
                                        ctypes.POINTER(ctypes.c_uint)]
 
749
    openpgp_crt_verify_self.restype = _error_code
 
750
 
 
751
    openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
 
752
    openpgp_crt_deinit.argtypes = [openpgp_crt_t]
 
753
    openpgp_crt_deinit.restype = None
 
754
 
 
755
    openpgp_crt_get_fingerprint = (
 
756
        _library.gnutls_openpgp_crt_get_fingerprint)
 
757
    openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
 
758
                                            ctypes.c_void_p,
 
759
                                            ctypes.POINTER(
 
760
                                                ctypes.c_size_t)]
 
761
    openpgp_crt_get_fingerprint.restype = _error_code
801
762
 
802
763
    # Remove non-public functions
803
764
    del _error_code, _retry_on_error
 
765
# Create the global "gnutls" object, simulating a module
 
766
gnutls = GnuTLS()
804
767
 
805
768
 
806
769
def call_pipe(connection,       # : multiprocessing.Connection
837
800
    disable_initiator_tag: a GLib event source tag, or None
838
801
    enabled:    bool()
839
802
    fingerprint: string (40 or 32 hexadecimal digits); used to
840
 
                 uniquely identify an OpenPGP client
841
 
    key_id: string (64 hexadecimal digits); used to uniquely identify
842
 
            a client using raw public keys
 
803
                 uniquely identify the client
843
804
    host:       string; available for use by the checker command
844
805
    interval:   datetime.timedelta(); How often to start a new checker
845
806
    last_approval_request: datetime.datetime(); (UTC) or None
863
824
    """
864
825
 
865
826
    runtime_expansions = ("approval_delay", "approval_duration",
866
 
                          "created", "enabled", "expires", "key_id",
 
827
                          "created", "enabled", "expires",
867
828
                          "fingerprint", "host", "interval",
868
829
                          "last_approval_request", "last_checked_ok",
869
830
                          "last_enabled", "name", "timeout")
899
860
            client["enabled"] = config.getboolean(client_name,
900
861
                                                  "enabled")
901
862
 
902
 
            # Uppercase and remove spaces from key_id and fingerprint
903
 
            # for later comparison purposes with return value from the
904
 
            # key_id() and fingerprint() functions
905
 
            client["key_id"] = (section.get("key_id", "").upper()
906
 
                                .replace(" ", ""))
 
863
            # Uppercase and remove spaces from fingerprint for later
 
864
            # comparison purposes with return value from the
 
865
            # fingerprint() function
907
866
            client["fingerprint"] = (section["fingerprint"].upper()
908
867
                                     .replace(" ", ""))
909
868
            if "secret" in section:
953
912
            self.expires = None
954
913
 
955
914
        logger.debug("Creating client %r", self.name)
956
 
        logger.debug("  Key ID: %s", self.key_id)
957
915
        logger.debug("  Fingerprint: %s", self.fingerprint)
958
916
        self.created = settings.get("created",
959
917
                                    datetime.datetime.utcnow())
2041
1999
    def Name_dbus_property(self):
2042
2000
        return dbus.String(self.name)
2043
2001
 
2044
 
    # KeyID - property
2045
 
    @dbus_annotations(
2046
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2047
 
    @dbus_service_property(_interface, signature="s", access="read")
2048
 
    def KeyID_dbus_property(self):
2049
 
        return dbus.String(self.key_id)
2050
 
 
2051
2002
    # Fingerprint - property
2052
2003
    @dbus_annotations(
2053
2004
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2209
2160
 
2210
2161
 
2211
2162
class ProxyClient(object):
2212
 
    def __init__(self, child_pipe, key_id, fpr, address):
 
2163
    def __init__(self, child_pipe, fpr, address):
2213
2164
        self._pipe = child_pipe
2214
 
        self._pipe.send(('init', key_id, fpr, address))
 
2165
        self._pipe.send(('init', fpr, address))
2215
2166
        if not self._pipe.recv():
2216
 
            raise KeyError(key_id or fpr)
 
2167
            raise KeyError(fpr)
2217
2168
 
2218
2169
    def __getattribute__(self, name):
2219
2170
        if name == '_pipe':
2286
2237
 
2287
2238
            approval_required = False
2288
2239
            try:
2289
 
                if gnutls.has_rawpk:
2290
 
                    fpr = ""
2291
 
                    try:
2292
 
                        key_id = self.key_id(
2293
 
                            self.peer_certificate(session))
2294
 
                    except (TypeError, gnutls.Error) as error:
2295
 
                        logger.warning("Bad certificate: %s", error)
2296
 
                        return
2297
 
                    logger.debug("Key ID: %s", key_id)
2298
 
 
2299
 
                else:
2300
 
                    key_id = ""
2301
 
                    try:
2302
 
                        fpr = self.fingerprint(
2303
 
                            self.peer_certificate(session))
2304
 
                    except (TypeError, gnutls.Error) as error:
2305
 
                        logger.warning("Bad certificate: %s", error)
2306
 
                        return
2307
 
                    logger.debug("Fingerprint: %s", fpr)
2308
 
 
2309
 
                try:
2310
 
                    client = ProxyClient(child_pipe, key_id, fpr,
 
2240
                try:
 
2241
                    fpr = self.fingerprint(
 
2242
                        self.peer_certificate(session))
 
2243
                except (TypeError, gnutls.Error) as error:
 
2244
                    logger.warning("Bad certificate: %s", error)
 
2245
                    return
 
2246
                logger.debug("Fingerprint: %s", fpr)
 
2247
 
 
2248
                try:
 
2249
                    client = ProxyClient(child_pipe, fpr,
2311
2250
                                         self.client_address)
2312
2251
                except KeyError:
2313
2252
                    return
2390
2329
 
2391
2330
    @staticmethod
2392
2331
    def peer_certificate(session):
2393
 
        "Return the peer's certificate as a bytestring"
2394
 
        try:
2395
 
            cert_type = gnutls.certificate_type_get2(session._c_object,
2396
 
                                                     gnutls.CTYPE_PEERS)
2397
 
        except AttributeError:
2398
 
            cert_type = gnutls.certificate_type_get(session._c_object)
2399
 
        if gnutls.has_rawpk:
2400
 
            valid_cert_types = frozenset((gnutls.CRT_RAWPK,))
2401
 
        else:
2402
 
            valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))
2403
 
        # If not a valid certificate type...
2404
 
        if cert_type not in valid_cert_types:
2405
 
            logger.info("Cert type %r not in %r", cert_type,
2406
 
                        valid_cert_types)
 
2332
        "Return the peer's OpenPGP certificate as a bytestring"
 
2333
        # If not an OpenPGP certificate...
 
2334
        if (gnutls.certificate_type_get(session._c_object)
 
2335
            != gnutls.CRT_OPENPGP):
2407
2336
            # ...return invalid data
2408
2337
            return b""
2409
2338
        list_size = ctypes.c_uint(1)
2417
2346
        return ctypes.string_at(cert.data, cert.size)
2418
2347
 
2419
2348
    @staticmethod
2420
 
    def key_id(certificate):
2421
 
        "Convert a certificate bytestring to a hexdigit key ID"
2422
 
        # New GnuTLS "datum" with the public key
2423
 
        datum = gnutls.datum_t(
2424
 
            ctypes.cast(ctypes.c_char_p(certificate),
2425
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2426
 
            ctypes.c_uint(len(certificate)))
2427
 
        # XXX all these need to be created in the gnutls "module"
2428
 
        # New empty GnuTLS certificate
2429
 
        pubkey = gnutls.pubkey_t()
2430
 
        gnutls.pubkey_init(ctypes.byref(pubkey))
2431
 
        # Import the raw public key into the certificate
2432
 
        gnutls.pubkey_import(pubkey,
2433
 
                             ctypes.byref(datum),
2434
 
                             gnutls.X509_FMT_DER)
2435
 
        # New buffer for the key ID
2436
 
        buf = ctypes.create_string_buffer(32)
2437
 
        buf_len = ctypes.c_size_t(len(buf))
2438
 
        # Get the key ID from the raw public key into the buffer
2439
 
        gnutls.pubkey_get_key_id(pubkey,
2440
 
                                 gnutls.KEYID_USE_SHA256,
2441
 
                                 ctypes.cast(ctypes.byref(buf),
2442
 
                                             ctypes.POINTER(ctypes.c_ubyte)),
2443
 
                                 ctypes.byref(buf_len))
2444
 
        # Deinit the certificate
2445
 
        gnutls.pubkey_deinit(pubkey)
2446
 
 
2447
 
        # Convert the buffer to a Python bytestring
2448
 
        key_id = ctypes.string_at(buf, buf_len.value)
2449
 
        # Convert the bytestring to hexadecimal notation
2450
 
        hex_key_id = binascii.hexlify(key_id).upper()
2451
 
        return hex_key_id
2452
 
 
2453
 
    @staticmethod
2454
2349
    def fingerprint(openpgp):
2455
2350
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
2456
2351
        # New GnuTLS "datum" with the OpenPGP public key
2684
2579
        command = request[0]
2685
2580
 
2686
2581
        if command == 'init':
2687
 
            key_id = request[1].decode("ascii")
2688
 
            fpr = request[2].decode("ascii")
2689
 
            address = request[3]
 
2582
            fpr = request[1].decode("ascii")
 
2583
            address = request[2]
2690
2584
 
2691
2585
            for c in self.clients.values():
2692
 
                if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":
2693
 
                    continue
2694
 
                if key_id and c.key_id == key_id:
2695
 
                    client = c
2696
 
                    break
2697
 
                if fpr and c.fingerprint == fpr:
 
2586
                if c.fingerprint == fpr:
2698
2587
                    client = c
2699
2588
                    break
2700
2589
            else:
2701
 
                logger.info("Client not found for key ID: %s, address"
2702
 
                            ": %s", key_id or fpr, address)
 
2590
                logger.info("Client not found for fingerprint: %s, ad"
 
2591
                            "dress: %s", fpr, address)
2703
2592
                if self.use_dbus:
2704
2593
                    # Emit D-Bus signal
2705
 
                    mandos_dbus_service.ClientNotFound(key_id or fpr,
 
2594
                    mandos_dbus_service.ClientNotFound(fpr,
2706
2595
                                                       address[0])
2707
2596
                parent_pipe.send(False)
2708
2597
                return False
2971
2860
        sys.exit(os.EX_OK if fail_count == 0 else 1)
2972
2861
 
2973
2862
    # Default values for config file for server-global settings
2974
 
    if gnutls.has_rawpk:
2975
 
        priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"
2976
 
                    ":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")
2977
 
    else:
2978
 
        priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
2979
 
                    ":+SIGN-DSA-SHA256")
2980
2863
    server_defaults = {"interface": "",
2981
2864
                       "address": "",
2982
2865
                       "port": "",
2983
2866
                       "debug": "False",
2984
 
                       "priority": priority,
 
2867
                       "priority":
 
2868
                       "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
 
2869
                       ":+SIGN-DSA-SHA256",
2985
2870
                       "servicename": "Mandos",
2986
2871
                       "use_dbus": "True",
2987
2872
                       "use_ipv6": "True",
2992
2877
                       "foreground": "False",
2993
2878
                       "zeroconf": "True",
2994
2879
                       }
2995
 
    del priority
2996
2880
 
2997
2881
    # Parse config file for server-global settings
2998
2882
    server_config = configparser.SafeConfigParser(server_defaults)
3242
3126
                        for k in ("name", "host"):
3243
3127
                            if isinstance(value[k], bytes):
3244
3128
                                value[k] = value[k].decode("utf-8")
3245
 
                        if not value.has_key("key_id"):
3246
 
                            value["key_id"] = ""
3247
 
                        elif not value.has_key("fingerprint"):
3248
 
                            value["fingerprint"] = ""
3249
3129
                    #  old_client_settings
3250
3130
                    # .keys()
3251
3131
                    old_client_settings = {
3388
3268
                pass
3389
3269
 
3390
3270
            @dbus.service.signal(_interface, signature="ss")
3391
 
            def ClientNotFound(self, key_id, address):
 
3271
            def ClientNotFound(self, fingerprint, address):
3392
3272
                "D-Bus signal"
3393
3273
                pass
3394
3274