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34 * Establish a security context on the acceptor (server). These functions
35 * wrap around libradsec and (thus) talk to a RADIUS server or proxy.
38 #include "gssapiP_eap.h"
40 #ifdef GSSEAP_ENABLE_REAUTH
42 eapGssSmAcceptGssReauth(OM_uint32 *minor,
45 gss_buffer_t inputToken,
46 gss_channel_bindings_t chanBindings,
47 gss_buffer_t outputToken);
51 * Mark an acceptor context as ready for cryptographic operations
54 acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
56 OM_uint32 major, tmpMinor;
58 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
60 /* Cache encryption type derived from selected mechanism OID */
61 major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
62 &ctx->encryptionType);
66 gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
68 major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
69 PW_USER_NAME, 0, &vp);
70 if (major == GSS_S_COMPLETE) {
71 nameBuf.length = vp->length;
72 nameBuf.value = vp->vp_strvalue;
74 ctx->gssFlags |= GSS_C_ANON_FLAG;
77 major = gssEapImportName(minor, &nameBuf,
78 (ctx->gssFlags & GSS_C_ANON_FLAG) ?
79 GSS_C_NT_ANONYMOUS : GSS_C_NT_USER_NAME,
84 major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
85 PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
86 if (GSS_ERROR(major)) {
87 *minor = GSSEAP_KEY_UNAVAILABLE;
88 return GSS_S_UNAVAILABLE;
91 major = gssEapDeriveRfc3961Key(minor,
99 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
101 if (GSS_ERROR(major))
104 major = sequenceInit(minor,
105 &ctx->seqState, ctx->recvSeq,
106 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
107 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
109 if (GSS_ERROR(major))
112 major = gssEapCreateAttrContext(minor, cred, ctx,
113 &ctx->initiatorName->attrCtx,
115 if (GSS_ERROR(major))
119 return GSS_S_COMPLETE;
123 * Emit a identity EAP request to force the initiator (peer) to identify
127 eapGssSmAcceptIdentity(OM_uint32 *minor,
130 gss_buffer_t inputToken,
131 gss_channel_bindings_t chanBindings,
132 gss_buffer_t outputToken)
135 struct wpabuf *reqData;
136 gss_buffer_desc pktBuffer;
138 if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
139 *minor = GSSEAP_WRONG_SIZE;
140 return GSS_S_DEFECTIVE_TOKEN;
143 assert(ctx->acceptorName == GSS_C_NO_NAME);
145 if (cred->name != GSS_C_NO_NAME) {
146 major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
147 if (GSS_ERROR(major))
151 reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0,
152 EAP_CODE_REQUEST, 0);
153 if (reqData == NULL) {
155 return GSS_S_FAILURE;
158 pktBuffer.length = wpabuf_len(reqData);
159 pktBuffer.value = (void *)wpabuf_head(reqData);
161 major = duplicateBuffer(minor, &pktBuffer, outputToken);
162 if (GSS_ERROR(major))
165 ctx->state = GSSEAP_STATE_AUTHENTICATE;
167 wpabuf_free(reqData);
170 return GSS_S_CONTINUE_NEEDED;
174 * Returns TRUE if the input token contains an EAP identity response.
177 isIdentityResponseP(gss_buffer_t inputToken)
179 struct wpabuf respData;
181 wpabuf_set(&respData, inputToken->value, inputToken->length);
183 return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
187 * Save the asserted initiator identity from the EAP identity response.
190 importInitiatorIdentity(OM_uint32 *minor,
192 gss_buffer_t inputToken)
195 struct wpabuf respData;
196 const unsigned char *pos;
198 gss_buffer_desc nameBuf;
200 wpabuf_set(&respData, inputToken->value, inputToken->length);
202 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
205 *minor = GSSEAP_PEER_BAD_MESSAGE;
206 return GSS_S_DEFECTIVE_TOKEN;
209 nameBuf.value = (void *)pos;
210 nameBuf.length = len;
212 gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
214 return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
215 &ctx->initiatorName);
219 * Pass the asserted initiator identity to the authentication server.
222 setInitiatorIdentity(OM_uint32 *minor,
226 OM_uint32 major, tmpMinor;
227 gss_buffer_desc nameBuf;
230 * We should have got an EAP identity response, but if we didn't, then
231 * we will just avoid sending User-Name. Note that radsecproxy requires
232 * User-Name to be sent on every request (presumably so it can remain
235 if (ctx->initiatorName != GSS_C_NO_NAME) {
236 major = gssEapDisplayName(minor, ctx->initiatorName, &nameBuf, NULL);
237 if (GSS_ERROR(major))
240 major = gssEapRadiusAddAvp(minor, vps, PW_USER_NAME, 0, &nameBuf);
241 if (GSS_ERROR(major))
244 gss_release_buffer(&tmpMinor, &nameBuf);
248 return GSS_S_COMPLETE;
252 * Pass the asserted acceptor identity to the authentication server.
255 setAcceptorIdentity(OM_uint32 *minor,
260 gss_buffer_desc nameBuf;
261 krb5_context krbContext = NULL;
262 krb5_principal krbPrinc;
263 struct rs_context *rc = ctx->acceptorCtx.radContext;
267 if (ctx->acceptorName == GSS_C_NO_NAME) {
269 return GSS_S_COMPLETE;
272 if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
273 *minor = GSSEAP_BAD_SERVICE_NAME;
274 return GSS_S_BAD_NAME;
277 GSSEAP_KRB_INIT(&krbContext);
279 krbPrinc = ctx->acceptorName->krbPrincipal;
280 assert(krbPrinc != NULL);
281 assert(KRB_PRINC_LENGTH(krbPrinc) >= 2);
283 /* Acceptor-Service-Name */
284 krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
286 major = gssEapRadiusAddAvp(minor, vps,
287 PW_GSS_ACCEPTOR_SERVICE_NAME,
290 if (GSS_ERROR(major))
293 /* Acceptor-Host-Name */
294 krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
296 major = gssEapRadiusAddAvp(minor, vps,
297 PW_GSS_ACCEPTOR_HOST_NAME,
300 if (GSS_ERROR(major))
303 if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
304 /* Acceptor-Service-Specific */
305 krb5_principal_data ssiPrinc = *krbPrinc;
308 KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
309 KRB_PRINC_NAME(&ssiPrinc) += 2;
311 *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
312 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
314 return GSS_S_FAILURE;
317 nameBuf.length = strlen(ssi);
319 major = gssEapRadiusAddAvp(minor, vps,
320 PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
324 if (GSS_ERROR(major)) {
325 krb5_free_unparsed_name(krbContext, ssi);
328 krb5_free_unparsed_name(krbContext, ssi);
331 krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
332 if (nameBuf.length != 0) {
333 /* Acceptor-Realm-Name */
334 major = gssEapRadiusAddAvp(minor, vps,
335 PW_GSS_ACCEPTOR_REALM_NAME,
338 if (GSS_ERROR(major))
343 return GSS_S_COMPLETE;
347 * Allocate a RadSec handle
350 createRadiusHandle(OM_uint32 *minor,
354 struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
355 const char *configFile = RS_CONFIG_FILE;
356 const char *configStanza = "gss-eap";
357 struct rs_alloc_scheme ralloc;
358 struct rs_error *err;
360 assert(actx->radContext == NULL);
361 assert(actx->radConn == NULL);
363 if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) {
364 *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
365 return GSS_S_FAILURE;
368 if (cred->radiusConfigFile != NULL)
369 configFile = cred->radiusConfigFile;
370 if (cred->radiusConfigStanza != NULL)
371 configStanza = cred->radiusConfigStanza;
373 ralloc.calloc = GSSEAP_CALLOC;
374 ralloc.malloc = GSSEAP_MALLOC;
375 ralloc.free = GSSEAP_FREE;
376 ralloc.realloc = GSSEAP_REALLOC;
378 rs_context_set_alloc_scheme(actx->radContext, &ralloc);
380 if (rs_context_read_config(actx->radContext, configFile) != 0) {
381 err = rs_err_ctx_pop(actx->radContext);
385 if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
386 err = rs_err_conn_pop(actx->radConn);
390 if (actx->radServer != NULL) {
391 if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
392 err = rs_err_conn_pop(actx->radConn);
398 return GSS_S_COMPLETE;
401 return gssEapRadiusMapError(minor, err);
405 * Process a EAP response from the initiator.
408 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
411 gss_buffer_t inputToken,
412 gss_channel_bindings_t chanBindings,
413 gss_buffer_t outputToken)
415 OM_uint32 major, tmpMinor;
416 struct rs_connection *rconn;
417 struct rs_request *request = NULL;
418 struct rs_packet *req = NULL, *resp = NULL;
419 struct radius_packet *frreq, *frresp;
421 if (ctx->acceptorCtx.radContext == NULL) {
422 /* May be NULL from an imported partial context */
423 major = createRadiusHandle(minor, cred, ctx);
424 if (GSS_ERROR(major))
428 if (isIdentityResponseP(inputToken)) {
429 major = importInitiatorIdentity(minor, ctx, inputToken);
430 if (GSS_ERROR(major))
434 rconn = ctx->acceptorCtx.radConn;
436 if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
437 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
440 frreq = rs_packet_frpkt(req);
442 major = setInitiatorIdentity(minor, ctx, &frreq->vps);
443 if (GSS_ERROR(major))
446 major = setAcceptorIdentity(minor, ctx, &frreq->vps);
447 if (GSS_ERROR(major))
450 major = gssEapRadiusAddAvp(minor, &frreq->vps,
451 PW_EAP_MESSAGE, 0, inputToken);
452 if (GSS_ERROR(major))
455 if (ctx->acceptorCtx.state.length != 0) {
456 major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
457 &ctx->acceptorCtx.state);
458 if (GSS_ERROR(major))
461 gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
464 if (rs_request_create(rconn, &request) != 0) {
465 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
469 rs_request_add_reqpkt(request, req);
472 if (rs_request_send(request, &resp) != 0) {
473 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
477 assert(resp != NULL);
479 frresp = rs_packet_frpkt(resp);
480 switch (frresp->code) {
481 case PW_AUTHENTICATION_ACK:
482 case PW_ACCESS_CHALLENGE:
483 major = GSS_S_CONTINUE_NEEDED;
485 case PW_AUTHENTICATION_REJECT:
486 *minor = GSSEAP_RADIUS_AUTH_FAILURE;
487 major = GSS_S_DEFECTIVE_CREDENTIAL;
491 *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
492 major = GSS_S_FAILURE;
497 major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
499 if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
500 *minor = GSSEAP_MISSING_EAP_REQUEST;
501 major = GSS_S_DEFECTIVE_TOKEN;
503 } else if (GSS_ERROR(major))
506 if (frresp->code == PW_ACCESS_CHALLENGE) {
507 major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
508 &ctx->acceptorCtx.state, TRUE);
509 if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
512 ctx->acceptorCtx.vps = frresp->vps;
515 major = acceptReadyEap(minor, ctx, cred);
516 if (GSS_ERROR(major))
519 ctx->state = GSSEAP_STATE_EXTENSIONS_REQ;
523 major = GSS_S_CONTINUE_NEEDED;
527 rs_request_destroy(request);
529 rs_packet_destroy(req);
530 if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIATOR_EXTS) {
531 assert(major == GSS_S_CONTINUE_NEEDED);
533 rs_conn_destroy(ctx->acceptorCtx.radConn);
534 ctx->acceptorCtx.radConn = NULL;
541 eapGssSmAcceptExtensionsReq(OM_uint32 *minor,
544 gss_buffer_t inputToken,
545 gss_channel_bindings_t chanBindings,
546 gss_buffer_t outputToken)
550 major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
551 if (GSS_ERROR(major))
554 outputToken->length = 0;
555 outputToken->value = NULL;
557 ctx->state = GSSEAP_STATE_EXTENSIONS_RESP;
560 return GSS_S_CONTINUE_NEEDED;
564 eapGssSmAcceptExtensionsResp(OM_uint32 *minor,
567 gss_buffer_t inputToken,
568 gss_channel_bindings_t chanBindings,
569 gss_buffer_t outputToken)
573 major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
574 if (GSS_ERROR(major))
577 ctx->state = GSSEAP_STATE_ESTABLISHED;
580 return GSS_S_COMPLETE;
584 eapGssSmAcceptEstablished(OM_uint32 *minor,
587 gss_buffer_t inputToken,
588 gss_channel_bindings_t chanBindings,
589 gss_buffer_t outputToken)
591 /* Called with already established context */
592 *minor = GSSEAP_CONTEXT_ESTABLISHED;
593 return GSS_S_BAD_STATUS;
597 makeErrorToken(OM_uint32 *minor,
598 OM_uint32 majorStatus,
599 OM_uint32 minorStatus,
600 gss_buffer_t outputToken)
602 unsigned char errorData[8];
603 gss_buffer_desc errorBuffer;
605 assert(GSS_ERROR(majorStatus));
608 * Only return error codes that the initiator could have caused,
609 * to avoid information leakage.
611 if (IS_RADIUS_ERROR(minorStatus)) {
612 /* Squash RADIUS error codes */
613 minorStatus = GSSEAP_RADIUS_PROT_FAILURE;
614 } else if (!IS_WIRE_ERROR(minorStatus)) {
615 /* Don't return non-wire error codes */
616 return GSS_S_COMPLETE;
619 minorStatus -= ERROR_TABLE_BASE_eapg;
621 store_uint32_be(majorStatus, &errorData[0]);
622 store_uint32_be(minorStatus, &errorData[4]);
624 errorBuffer.length = sizeof(errorData);
625 errorBuffer.value = errorData;
627 return duplicateBuffer(minor, &errorBuffer, outputToken);
630 static struct gss_eap_acceptor_sm {
631 enum gss_eap_token_type inputTokenType;
632 enum gss_eap_token_type outputTokenType;
633 OM_uint32 (*processToken)(OM_uint32 *,
637 gss_channel_bindings_t,
639 } eapGssAcceptorSm[] = {
640 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptIdentity },
641 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptAuthenticate },
642 { TOK_TYPE_EXT_REQ, TOK_TYPE_NONE, eapGssSmAcceptExtensionsReq },
643 { TOK_TYPE_NONE, TOK_TYPE_EXT_RESP, eapGssSmAcceptExtensionsResp },
644 { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmAcceptEstablished },
645 { TOK_TYPE_NONE, TOK_TYPE_CONTEXT_ERR, NULL },
646 #ifdef GSSEAP_ENABLE_REAUTH
647 { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmAcceptGssReauth },
652 gss_accept_sec_context(OM_uint32 *minor,
653 gss_ctx_id_t *context_handle,
655 gss_buffer_t input_token,
656 gss_channel_bindings_t input_chan_bindings,
657 gss_name_t *src_name,
659 gss_buffer_t output_token,
660 OM_uint32 *ret_flags,
662 gss_cred_id_t *delegated_cred_handle)
665 OM_uint32 tmpMajor, tmpMinor;
666 gss_ctx_id_t ctx = *context_handle;
667 struct gss_eap_acceptor_sm *sm = NULL;
668 gss_buffer_desc innerInputToken = GSS_C_EMPTY_BUFFER;
669 gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
670 enum gss_eap_token_type tokType;
671 int initialContextToken = 0;
675 output_token->length = 0;
676 output_token->value = NULL;
678 if (src_name != NULL)
679 *src_name = GSS_C_NO_NAME;
681 if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
682 *minor = GSSEAP_TOK_TRUNC;
683 return GSS_S_DEFECTIVE_TOKEN;
686 if (ctx == GSS_C_NO_CONTEXT) {
687 major = gssEapAllocContext(minor, &ctx);
688 if (GSS_ERROR(major))
691 initialContextToken = 1;
692 *context_handle = ctx;
695 GSSEAP_MUTEX_LOCK(&ctx->mutex);
697 if (cred == GSS_C_NO_CREDENTIAL) {
698 if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
699 major = gssEapAcquireCred(minor,
708 if (GSS_ERROR(major))
712 cred = ctx->defaultCred;
715 GSSEAP_MUTEX_LOCK(&cred->mutex);
717 sm = &eapGssAcceptorSm[ctx->state];
719 major = gssEapVerifyToken(minor, ctx, input_token,
720 &tokType, &innerInputToken);
721 if (GSS_ERROR(major))
724 if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
725 *minor = GSSEAP_CRED_MECH_MISMATCH;
726 major = GSS_S_BAD_MECH;
730 #ifdef GSSEAP_ENABLE_REAUTH
732 * If we're built with fast reauthentication support, it's valid
733 * for an initiator to send a GSS reauthentication token as its
734 * initial context token, causing us to short-circuit the state
735 * machine and process Kerberos GSS messages instead.
737 if (tokType == TOK_TYPE_GSS_REAUTH && initialContextToken) {
738 ctx->state = GSSEAP_STATE_KRB_REAUTH;
741 if (tokType != sm->inputTokenType) {
742 *minor = GSSEAP_WRONG_TOK_ID;
743 major = GSS_S_DEFECTIVE_TOKEN;
748 sm = &eapGssAcceptorSm[ctx->state];
750 major = (sm->processToken)(minor,
756 if (GSS_ERROR(major)) {
757 /* Possibly generate an error token */
758 tmpMajor = makeErrorToken(&tmpMinor, major, *minor, &innerOutputToken);
759 if (GSS_ERROR(tmpMajor)) {
764 sm = &eapGssAcceptorSm[GSSEAP_STATE_ERROR];
767 } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.length == 0);
769 if (mech_type != NULL) {
770 if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
771 duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
773 if (ret_flags != NULL)
774 *ret_flags = ctx->gssFlags;
775 if (delegated_cred_handle != NULL)
776 *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
778 if (major == GSS_S_COMPLETE) {
779 if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
780 major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
781 if (GSS_ERROR(major))
784 if (time_rec != NULL) {
785 major = gssEapContextTime(&tmpMinor, ctx, time_rec);
786 if (GSS_ERROR(major))
791 assert(ctx->state == GSSEAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
794 if (innerOutputToken.value != NULL) {
795 tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
796 sm->outputTokenType, output_token);
797 if (GSS_ERROR(tmpMajor)) {
805 if (cred != GSS_C_NO_CREDENTIAL)
806 GSSEAP_MUTEX_UNLOCK(&cred->mutex);
807 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
809 if (GSS_ERROR(major))
810 gssEapReleaseContext(&tmpMinor, context_handle);
812 gss_release_buffer(&tmpMinor, &innerOutputToken);
817 #ifdef GSSEAP_ENABLE_REAUTH
819 acceptReadyKrb(OM_uint32 *minor,
822 const gss_name_t initiator,
828 major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
829 if (GSS_ERROR(major))
832 if (cred->name != GSS_C_NO_NAME) {
833 major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
834 if (GSS_ERROR(major))
838 major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
839 if (GSS_ERROR(major))
842 ctx->state = GSSEAP_STATE_ESTABLISHED;
845 return GSS_S_COMPLETE;
849 eapGssSmAcceptGssReauth(OM_uint32 *minor,
852 gss_buffer_t inputToken,
853 gss_channel_bindings_t chanBindings,
854 gss_buffer_t outputToken)
856 OM_uint32 major, tmpMinor;
857 gss_name_t krbInitiator = GSS_C_NO_NAME;
858 gss_OID mech = GSS_C_NO_OID;
859 OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
861 ctx->flags |= CTX_FLAG_KRB_REAUTH;
863 major = gssAcceptSecContext(minor,
874 if (major == GSS_S_COMPLETE) {
875 major = acceptReadyKrb(minor, ctx, cred,
876 krbInitiator, mech, timeRec);
879 ctx->gssFlags = gssFlags;
881 gssReleaseName(&tmpMinor, &krbInitiator);
885 #endif /* GSSEAP_ENABLE_REAUTH */