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33 #include "gssapiP_eap.h"
38 * Fast reauthentication support for EAP GSS.
42 krb5_encrypt_tkt_part(krb5_context, const krb5_keyblock *, krb5_ticket *);
45 encode_krb5_ticket(const krb5_ticket *rep, krb5_data **code);
48 gssDisplayName(OM_uint32 *minor,
54 gssImportName(OM_uint32 *minor,
59 static krb5_error_code
60 getAcceptorKey(krb5_context krbContext,
63 krb5_principal *princ,
67 krb5_keytab keytab = NULL;
68 krb5_keytab_entry ktent = { 0 };
69 krb5_kt_cursor cursor = NULL;
72 memset(key, 0, sizeof(*key));
74 code = krb5_kt_default(krbContext, &keytab);
78 if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
79 code = krb5_kt_get_entry(krbContext, keytab,
80 cred->name->krbPrincipal, 0,
81 ctx->encryptionType, &ktent);
86 * It's not clear that looking encrypting the ticket in the
87 * requested EAP enctype provides any value.
89 code = krb5_kt_start_seq_get(krbContext, keytab, &cursor);
93 while ((code = krb5_kt_next_entry(krbContext, keytab,
94 &ktent, &cursor)) == 0) {
95 if (ktent.key.enctype == ctx->encryptionType)
98 krb5_free_keytab_entry_contents(krbContext, &ktent);
103 *princ = ktent.principal;
108 if (cred == GSS_C_NO_CREDENTIAL || cred->name == GSS_C_NO_NAME)
109 krb5_kt_end_seq_get(krbContext, keytab, &cursor);
110 krb5_kt_close(krbContext, keytab);
113 krb5_free_keytab_entry_contents(krbContext, &ktent);
119 freezeAttrContext(OM_uint32 *minor,
120 gss_name_t initiatorName,
121 krb5_const_principal acceptorPrinc,
122 krb5_keyblock *session,
123 krb5_authdata ***authdata)
125 OM_uint32 major, tmpMinor;
126 krb5_error_code code;
127 gss_buffer_desc attrBuf = GSS_C_EMPTY_BUFFER;
128 krb5_authdata *authData[2], authDatum = { 0 };
129 krb5_context krbContext;
131 GSSEAP_KRB_INIT(&krbContext);
133 major = gssEapExportAttrContext(minor, initiatorName, &attrBuf);
134 if (GSS_ERROR(major))
137 authDatum.ad_type = KRB5_AUTHDATA_RADIUS_AVP;
138 authDatum.length = attrBuf.length;
139 authDatum.contents = attrBuf.value;
140 authData[0] = &authDatum;
143 code = krb5_make_authdata_kdc_issued(krbContext, session, acceptorPrinc,
146 major = GSS_S_FAILURE;
149 major = GSS_S_COMPLETE;
152 gss_release_buffer(&tmpMinor, &attrBuf);
158 * Fabricate a ticket to ourselves given a GSS EAP context.
161 gssEapMakeReauthCreds(OM_uint32 *minor,
164 gss_buffer_t credBuf)
166 OM_uint32 major = GSS_S_COMPLETE;
167 krb5_error_code code;
168 krb5_context krbContext = NULL;
169 krb5_ticket ticket = { 0 };
170 krb5_keyblock session = { 0 }, acceptorKey = { 0 };
171 krb5_enc_tkt_part enc_part = { 0 };
172 krb5_data *ticketData = NULL, *credsData = NULL;
173 krb5_creds creds = { 0 };
174 krb5_auth_context authContext = NULL;
177 credBuf->value = NULL;
179 GSSEAP_KRB_INIT(&krbContext);
181 code = getAcceptorKey(krbContext, ctx, cred,
182 &ticket.server, &acceptorKey);
183 if (code == KRB5_KT_NOTFOUND) {
184 gss_buffer_desc emptyToken = { 0, "" };
187 * If we can't produce the KRB-CRED message, we need to
188 * return an empty (not NULL) token to the caller so we
189 * don't change the number of authentication legs.
191 return duplicateBuffer(minor, &emptyToken, credBuf);
192 } else if (code != 0)
195 enc_part.flags = TKT_FLG_INITIAL;
198 * Generate a random session key to place in the ticket and
199 * sign the "KDC-Issued" authorization data element.
201 code = krb5_c_make_random_key(krbContext, ctx->encryptionType,
206 enc_part.session = &session;
207 enc_part.client = ctx->initiatorName->krbPrincipal;
208 enc_part.times.authtime = time(NULL);
209 enc_part.times.starttime = enc_part.times.authtime;
210 enc_part.times.endtime = ctx->expiryTime
213 enc_part.times.renew_till = 0;
215 major = freezeAttrContext(minor, ctx->initiatorName, ticket.server,
216 &session, &enc_part.authorization_data);
217 if (GSS_ERROR(major))
220 ticket.enc_part2 = &enc_part;
222 code = krb5_encrypt_tkt_part(krbContext, &acceptorKey, &ticket);
226 code = encode_krb5_ticket(&ticket, &ticketData);
230 creds.client = enc_part.client;
231 creds.server = ticket.server;
232 creds.keyblock = session;
233 creds.times = enc_part.times;
234 creds.ticket_flags = enc_part.flags;
235 creds.ticket = *ticketData;
236 creds.authdata = enc_part.authorization_data;
238 code = krb5_auth_con_init(krbContext, &authContext);
242 code = krb5_auth_con_setflags(krbContext, authContext, 0);
246 code = krb5_auth_con_setsendsubkey(krbContext, authContext,
251 code = krb5_mk_1cred(krbContext, authContext, &creds, &credsData, NULL);
255 krbDataToGssBuffer(credsData, credBuf);
258 if (ticket.enc_part.ciphertext.data != NULL)
259 GSSEAP_FREE(ticket.enc_part.ciphertext.data);
260 krb5_free_keyblock_contents(krbContext, &session);
261 krb5_free_keyblock_contents(krbContext, &acceptorKey);
262 krb5_free_data(krbContext, ticketData);
263 krb5_auth_con_free(krbContext, authContext);
264 krb5_free_authdata(krbContext, enc_part.authorization_data);
265 if (credsData != NULL)
266 GSSEAP_FREE(credsData);
268 if (major == GSS_S_COMPLETE) {
270 major = code != 0 ? GSS_S_FAILURE : GSS_S_COMPLETE;
277 isTicketGrantingServiceP(krb5_context krbContext,
278 krb5_const_principal principal)
280 if (krb5_princ_size(krbContext, principal) == 2 &&
281 krb5_princ_component(krbContext, principal, 0)->length == 6 &&
282 memcmp(krb5_princ_component(krbContext,
283 principal, 0)->data, "krbtgt", 6) == 0)
290 * Returns TRUE if the configuration variable reauth_use_ccache is
291 * set in krb5.conf for the eap_gss application and the client realm.
294 reauthUseCredsCache(krb5_context krbContext,
295 krb5_principal principal)
299 /* if reauth_use_ccache, use default credentials cache if ticket is for us */
300 krb5_appdefault_boolean(krbContext, "eap_gss",
301 krb5_princ_realm(krbContext, principal),
302 "reauth_use_ccache", 0, &reauthUseCCache);
304 return reauthUseCCache;
308 * Look in default credentials cache for reauthentication credentials,
312 getDefaultReauthCredentials(OM_uint32 *minor,
318 OM_uint32 major = GSS_S_CRED_UNAVAIL;
319 krb5_context krbContext = NULL;
320 krb5_error_code code;
321 krb5_ccache ccache = NULL;
322 krb5_creds match = { 0 };
323 krb5_creds creds = { 0 };
325 GSSEAP_KRB_INIT(&krbContext);
327 assert(cred != GSS_C_NO_CREDENTIAL);
328 assert(target != GSS_C_NO_NAME);
330 if (cred->name == GSS_C_NO_NAME ||
331 !reauthUseCredsCache(krbContext, cred->name->krbPrincipal))
334 match.client = cred->name->krbPrincipal;
335 match.server = target->krbPrincipal;
336 if (timeReq != 0 && timeReq != GSS_C_INDEFINITE)
337 match.times.endtime = now + timeReq;
339 code = krb5_cc_default(krbContext, &ccache);
343 code = krb5_cc_retrieve_cred(krbContext, ccache, 0, &match, &creds);
347 cred->flags |= CRED_FLAG_DEFAULT_CCACHE;
348 cred->krbCredCache = ccache;
351 major = gss_krb5_import_cred(minor, cred->krbCredCache, NULL, NULL,
355 if (major == GSS_S_CRED_UNAVAIL)
359 krb5_cc_close(krbContext, ccache);
360 krb5_free_cred_contents(krbContext, &creds);
366 * Returns TRUE if the credential handle's reauth credentials are
367 * valid or if we can use the default credentials cache. Credentials
368 * handle must be locked.
371 gssEapCanReauthP(gss_cred_id_t cred,
375 time_t now, expiryReq;
378 assert(cred != GSS_C_NO_CREDENTIAL);
382 if (timeReq != GSS_C_INDEFINITE)
383 expiryReq += timeReq;
385 if (cred->krbCredCache != NULL && cred->expiryTime > expiryReq)
388 if (getDefaultReauthCredentials(&minor, cred, target,
389 now, timeReq) == GSS_S_COMPLETE)
396 * Store re-authentication (Kerberos) credentials in a credential handle.
397 * Credentials handle must be locked.
400 gssEapStoreReauthCreds(OM_uint32 *minor,
403 gss_buffer_t credBuf)
405 OM_uint32 major = GSS_S_COMPLETE;
406 krb5_error_code code;
407 krb5_context krbContext = NULL;
408 krb5_auth_context authContext = NULL;
409 krb5_data credData = { 0 };
410 krb5_creds **creds = NULL;
411 krb5_principal canonPrinc;
412 krb5_principal ccPrinc = NULL;
415 if (credBuf->length == 0 || cred == GSS_C_NO_CREDENTIAL)
416 return GSS_S_COMPLETE;
418 GSSEAP_KRB_INIT(&krbContext);
420 code = krb5_auth_con_init(krbContext, &authContext);
424 code = krb5_auth_con_setflags(krbContext, authContext, 0);
428 code = krb5_auth_con_setrecvsubkey(krbContext, authContext,
433 gssBufferToKrbData(credBuf, &credData);
435 code = krb5_rd_cred(krbContext, authContext, &credData, &creds, NULL);
439 if (creds == NULL || creds[0] == NULL)
442 code = krb5_copy_principal(krbContext, creds[0]->client, &canonPrinc);
446 krb5_free_principal(krbContext, cred->name->krbPrincipal);
447 cred->name->krbPrincipal = canonPrinc;
449 cred->expiryTime = creds[0]->times.endtime;
451 if (cred->krbCredCache == NULL) {
452 if (reauthUseCredsCache(krbContext, creds[0]->client) &&
453 krb5_cc_default(krbContext, &cred->krbCredCache) == 0)
454 cred->flags |= CRED_FLAG_DEFAULT_CCACHE;
457 * If we already have an associated credentials cache, possibly from
458 * the last time we stored a reauthentication credential, then we
459 * need to clear it out and release the associated GSS credential.
461 if (cred->flags & CRED_FLAG_DEFAULT_CCACHE) {
462 krb5_cc_remove_cred(krbContext, cred->krbCredCache, 0, creds[0]);
464 krb5_cc_destroy(krbContext, cred->krbCredCache);
465 cred->krbCredCache = NULL;
467 gssReleaseCred(minor, &cred->krbCred);
470 if (cred->krbCredCache == NULL) {
471 code = krb5_cc_new_unique(krbContext, "MEMORY", NULL, &cred->krbCredCache);
476 if ((cred->flags & CRED_FLAG_DEFAULT_CCACHE) == 0 ||
477 krb5_cc_get_principal(krbContext, cred->krbCredCache, &ccPrinc) != 0) {
478 code = krb5_cc_initialize(krbContext, cred->krbCredCache,
484 for (i = 0; creds[i] != NULL; i++) {
485 krb5_creds kcred = *(creds[i]);
488 * Swap in the acceptor name the client asked for so
489 * get_credentials() works. We're making the assumption that
490 * any service tickets returned are for us. We'll need to
491 * reflect some more on whether that is a safe assumption.
493 if (!isTicketGrantingServiceP(krbContext, kcred.server))
494 kcred.server = ctx->acceptorName->krbPrincipal;
496 code = krb5_cc_store_cred(krbContext, cred->krbCredCache, &kcred);
501 major = gss_krb5_import_cred(minor, cred->krbCredCache, NULL, NULL,
503 if (GSS_ERROR(major))
509 krb5_free_principal(krbContext, ccPrinc);
510 krb5_auth_con_free(krbContext, authContext);
512 for (i = 0; creds[i] != NULL; i++)
513 krb5_free_creds(krbContext, creds[i]);
516 if (major == GSS_S_COMPLETE)
517 major = *minor ? GSS_S_FAILURE : GSS_S_COMPLETE;
522 static gss_buffer_desc radiusAvpKrbAttr = {
523 sizeof("urn:authdata-radius-avp") - 1, "urn:authdata-radius-avp"
527 * Unfortunately extracting an AD-KDCIssued authorization data element
528 * is pretty implementation-dependent. It's not possible to verify the
529 * signature ourselves because the ticket session key is not exposed
530 * outside GSS. In an ideal world, all AD-KDCIssued elements would be
531 * verified by the Kerberos library and authentication would fail if
532 * verification failed. We're not quite there yet and as a result have
533 * to go through some hoops to get this to work. The alternative would
534 * be to sign the authorization data with our long-term key, but it
535 * seems a pity to compromise the design because of current implementation
538 * (Specifically, the hoops involve a libkrb5 authorisation data plugin
539 * that exposes the verified and serialised attribute context through
540 * the Kerberos GSS mechanism's naming extensions API.)
543 defrostAttrContext(OM_uint32 *minor,
547 OM_uint32 major, tmpMinor;
548 gss_buffer_desc authData = GSS_C_EMPTY_BUFFER;
549 gss_buffer_desc authDataDisplay = GSS_C_EMPTY_BUFFER;
551 int authenticated, complete;
553 major = gssGetNameAttribute(minor, glueName, &radiusAvpKrbAttr,
554 &authenticated, &complete,
555 &authData, &authDataDisplay, &more);
556 if (major == GSS_S_COMPLETE) {
557 if (authenticated == 0)
558 major = GSS_S_BAD_NAME;
560 major = gssEapImportAttrContext(minor, &authData, mechName);
561 } else if (major == GSS_S_UNAVAILABLE) {
562 major = GSS_S_COMPLETE;
565 gss_release_buffer(&tmpMinor, &authData);
566 gss_release_buffer(&tmpMinor, &authDataDisplay);
572 * Convert a mechanism glue to an EAP mechanism name by displaying and
573 * importing it. This also handles the RADIUS attributes.
576 gssEapGlueToMechName(OM_uint32 *minor,
578 gss_name_t *pMechName)
580 OM_uint32 major, tmpMinor;
581 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
583 *pMechName = GSS_C_NO_NAME;
585 major = gssDisplayName(minor, glueName, &nameBuf, NULL);
586 if (GSS_ERROR(major))
589 major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
591 if (GSS_ERROR(major))
594 major = defrostAttrContext(minor, glueName, *pMechName);
595 if (GSS_ERROR(major))
599 if (GSS_ERROR(major)) {
600 gssReleaseName(&tmpMinor, pMechName);
601 *pMechName = GSS_C_NO_NAME;
604 gss_release_buffer(&tmpMinor, &nameBuf);
610 * Convert an EAP mechanism name to a mechanism glue name by displaying
614 gssEapMechToGlueName(OM_uint32 *minor,
616 gss_name_t *pGlueName)
618 OM_uint32 major, tmpMinor;
619 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
621 *pGlueName = GSS_C_NO_NAME;
623 major = gssEapDisplayName(minor, mechName, &nameBuf, NULL);
624 if (GSS_ERROR(major))
627 major = gssImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
629 if (GSS_ERROR(major))
633 gss_release_buffer(&tmpMinor, &nameBuf);
639 * Suck out the analgous elements of a Kerberos GSS context into an EAP
640 * one so that the application doesn't know the difference.
643 gssEapReauthComplete(OM_uint32 *minor,
649 OM_uint32 major, tmpMinor;
650 gss_buffer_set_t keyData = GSS_C_NO_BUFFER_SET;
652 if (!oidEqual(mech, gss_mech_krb5)) {
653 major = GSS_S_BAD_MECH;
657 /* Get the raw subsession key and encryption type*/
658 major = gssInquireSecContextByOid(minor, ctx->kerberosCtx,
659 GSS_C_INQ_SSPI_SESSION_KEY, &keyData);
660 if (GSS_ERROR(major))
667 oid.length = keyData->elements[1].length;
668 oid.elements = keyData->elements[1].value;
670 /* GSS_KRB5_SESSION_KEY_ENCTYPE_OID */
671 major = decomposeOid(minor,
672 "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04",
674 if (GSS_ERROR(major))
677 ctx->encryptionType = suffix;
681 krb5_context krbContext = NULL;
684 GSSEAP_KRB_INIT(&krbContext);
686 KRB_KEY_LENGTH(&key) = keyData->elements[0].length;
687 KRB_KEY_DATA(&key) = keyData->elements[0].value;
688 KRB_KEY_TYPE(&key) = ctx->encryptionType;
690 *minor = krb5_copy_keyblock_contents(krbContext,
691 &key, &ctx->rfc3961Key);
693 major = GSS_S_FAILURE;
698 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
700 if (GSS_ERROR(major))
703 if (timeRec != GSS_C_INDEFINITE)
704 ctx->expiryTime = time(NULL) + timeRec;
706 /* Initialize our sequence state */
707 major = sequenceInit(minor,
708 &ctx->seqState, ctx->recvSeq,
709 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
710 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
712 if (GSS_ERROR(major))
715 major = GSS_S_COMPLETE;
718 gss_release_buffer_set(&tmpMinor, &keyData);
724 * The remainder of this file consists of wrappers so we can call into the
725 * mechanism glue without calling ourselves.
728 (*gssInitSecContextNext)(OM_uint32 *,
735 gss_channel_bindings_t,
743 (*gssAcceptSecContextNext)(OM_uint32 *,
747 gss_channel_bindings_t,
756 (*gssReleaseCredNext)(OM_uint32 *, gss_cred_id_t *);
759 (*gssReleaseNameNext)(OM_uint32 *, gss_name_t *);
762 (*gssInquireSecContextByOidNext)(OM_uint32 *,
768 (*gssDeleteSecContextNext)(OM_uint32 *,
773 (*gssDisplayNameNext)(OM_uint32 *,
779 (*gssImportNameNext)(OM_uint32 *,
785 (*gssStoreCredNext)(OM_uint32 *,
795 (*gssGetNameAttributeNext)(OM_uint32 *,
804 #define NEXT_SYMBOL(local, global) ((local) = dlsym(RTLD_NEXT, (global)))
807 gssEapReauthInitialize(OM_uint32 *minor)
809 NEXT_SYMBOL(gssInitSecContextNext, "gss_init_sec_context");
810 NEXT_SYMBOL(gssAcceptSecContextNext, "gss_accept_sec_context");
811 NEXT_SYMBOL(gssReleaseCredNext, "gss_release_cred");
812 NEXT_SYMBOL(gssReleaseNameNext, "gss_release_name");
813 NEXT_SYMBOL(gssInquireSecContextByOidNext, "gss_inquire_sec_context_by_oid");
814 NEXT_SYMBOL(gssDeleteSecContextNext, "gss_delete_sec_context");
815 NEXT_SYMBOL(gssDisplayNameNext, "gss_display_name");
816 NEXT_SYMBOL(gssImportNameNext, "gss_import_name");
817 NEXT_SYMBOL(gssStoreCredNext, "gss_store_cred");
818 NEXT_SYMBOL(gssGetNameAttributeNext, "gss_get_name_attribute");
820 return GSS_S_COMPLETE;
824 gssInitSecContext(OM_uint32 *minor,
826 gss_ctx_id_t *context_handle,
827 gss_name_t target_name,
831 gss_channel_bindings_t input_chan_bindings,
832 gss_buffer_t input_token,
833 gss_OID *actual_mech_type,
834 gss_buffer_t output_token,
835 OM_uint32 *ret_flags,
838 if (gssInitSecContextNext == NULL)
839 return GSS_S_UNAVAILABLE;
841 return gssInitSecContextNext(minor, cred, context_handle,
842 target_name, mech_type, req_flags,
843 time_req, input_chan_bindings,
844 input_token, actual_mech_type,
845 output_token, ret_flags, time_rec);
849 gssAcceptSecContext(OM_uint32 *minor,
850 gss_ctx_id_t *context_handle,
852 gss_buffer_t input_token,
853 gss_channel_bindings_t input_chan_bindings,
854 gss_name_t *src_name,
856 gss_buffer_t output_token,
857 OM_uint32 *ret_flags,
859 gss_cred_id_t *delegated_cred_handle)
861 if (gssAcceptSecContextNext == NULL)
862 return GSS_S_UNAVAILABLE;
864 return gssAcceptSecContextNext(minor, context_handle, cred,
865 input_token, input_chan_bindings,
866 src_name, mech_type, output_token,
867 ret_flags, time_rec, delegated_cred_handle);
871 gssReleaseCred(OM_uint32 *minor,
872 gss_cred_id_t *cred_handle)
874 if (gssReleaseCredNext == NULL)
875 return GSS_S_UNAVAILABLE;
877 return gssReleaseCredNext(minor, cred_handle);
881 gssReleaseName(OM_uint32 *minor,
884 if (gssReleaseName == NULL)
885 return GSS_S_UNAVAILABLE;
887 return gssReleaseNameNext(minor, name);
891 gssDeleteSecContext(OM_uint32 *minor,
892 gss_ctx_id_t *context_handle,
893 gss_buffer_t output_token)
895 if (gssDeleteSecContextNext == NULL)
896 return GSS_S_UNAVAILABLE;
898 return gssDeleteSecContextNext(minor, context_handle, output_token);
902 gssDisplayName(OM_uint32 *minor,
907 if (gssDisplayNameNext == NULL)
908 return GSS_S_UNAVAILABLE;
910 return gssDisplayNameNext(minor, name, buffer, name_type);
914 gssImportName(OM_uint32 *minor,
919 if (gssImportNameNext == NULL)
920 return GSS_S_UNAVAILABLE;
922 return gssImportNameNext(minor, buffer, name_type, name);
926 gssInquireSecContextByOid(OM_uint32 *minor,
927 const gss_ctx_id_t context_handle,
928 const gss_OID desired_object,
929 gss_buffer_set_t *data_set)
931 if (gssInquireSecContextByOidNext == NULL)
932 return GSS_S_UNAVAILABLE;
934 return gssInquireSecContextByOidNext(minor, context_handle,
935 desired_object, data_set);
939 gssStoreCred(OM_uint32 *minor,
940 const gss_cred_id_t input_cred_handle,
941 gss_cred_usage_t input_usage,
942 const gss_OID desired_mech,
943 OM_uint32 overwrite_cred,
944 OM_uint32 default_cred,
945 gss_OID_set *elements_stored,
946 gss_cred_usage_t *cred_usage_stored)
948 if (gssStoreCredNext == NULL)
949 return GSS_S_UNAVAILABLE;
951 return gssStoreCredNext(minor, input_cred_handle, input_usage,
952 desired_mech, overwrite_cred, default_cred,
953 elements_stored, cred_usage_stored);
957 gssGetNameAttribute(OM_uint32 *minor,
963 gss_buffer_t display_value,
966 if (gssGetNameAttributeNext == NULL)
967 return GSS_S_UNAVAILABLE;
969 return gssGetNameAttributeNext(minor, name, attr, authenticated, complete,
970 value, display_value, more);