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33 #include "gssapiP_eap.h"
35 #ifdef GSSEAP_ENABLE_REAUTH
37 eapGssSmAcceptGssReauth(OM_uint32 *minor,
40 gss_buffer_t inputToken,
41 gss_channel_bindings_t chanBindings,
42 gss_buffer_t outputToken);
46 * Mark an acceptor context as ready for cryptographic operations
49 acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
51 OM_uint32 major, tmpMinor;
53 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
55 /* Cache encryption type derived from selected mechanism OID */
56 major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
57 &ctx->encryptionType);
61 gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
63 major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
64 PW_USER_NAME, 0, &vp);
65 if (major == GSS_S_COMPLETE) {
66 nameBuf.length = vp->length;
67 nameBuf.value = vp->vp_strvalue;
69 ctx->gssFlags |= GSS_C_ANON_FLAG;
72 major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
77 major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
78 PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
79 if (GSS_ERROR(major)) {
80 *minor = GSSEAP_KEY_UNAVAILABLE;
81 return GSS_S_UNAVAILABLE;
84 major = gssEapDeriveRfc3961Key(minor,
92 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
97 major = sequenceInit(minor,
98 &ctx->seqState, ctx->recvSeq,
99 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
100 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
102 if (GSS_ERROR(major))
105 ctx->initiatorName->attrCtx = gssEapCreateAttrContext(cred, ctx);
108 return GSS_S_COMPLETE;
112 * Emit a identity EAP request to force the initiator (peer) to identify
116 eapGssSmAcceptIdentity(OM_uint32 *minor,
119 gss_buffer_t inputToken,
120 gss_channel_bindings_t chanBindings,
121 gss_buffer_t outputToken)
126 unsigned char data[5];
128 gss_buffer_desc pktBuffer;
130 if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
131 *minor = GSSEAP_WRONG_SIZE;
132 return GSS_S_DEFECTIVE_TOKEN;
135 assert(ctx->acceptorName == GSS_C_NO_NAME);
137 if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
138 major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
139 if (GSS_ERROR(major))
143 pkt.pdu.code = EAP_CODE_REQUEST;
144 pkt.pdu.identifier = 0;
145 pkt.pdu.length = htons(sizeof(pkt.data));
146 pkt.data[4] = EAP_TYPE_IDENTITY;
148 pktBuffer.length = sizeof(pkt.data);
149 pktBuffer.value = pkt.data;
151 major = duplicateBuffer(minor, &pktBuffer, outputToken);
152 if (GSS_ERROR(major))
155 ctx->state = EAP_STATE_AUTHENTICATE;
158 return GSS_S_CONTINUE_NEEDED;
162 * Pass the asserted acceptor identity to the authentication server.
165 setAcceptorIdentity(OM_uint32 *minor,
170 gss_buffer_desc nameBuf;
171 krb5_context krbContext = NULL;
172 krb5_principal krbPrinc;
173 struct rs_context *rc = ctx->acceptorCtx.radContext;
177 if (ctx->acceptorName == GSS_C_NO_NAME) {
179 return GSS_S_COMPLETE;
182 if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
183 *minor = GSSEAP_BAD_SERVICE_NAME;
184 return GSS_S_BAD_NAME;
187 GSSEAP_KRB_INIT(&krbContext);
189 krbPrinc = ctx->acceptorName->krbPrincipal;
190 assert(krbPrinc != NULL);
191 assert(krb5_princ_size(krbContext, krbPrinc) >= 2);
193 /* Acceptor-Service-Name */
194 krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 0), &nameBuf);
196 major = gssEapRadiusAddAvp(minor, vps,
197 PW_GSS_ACCEPTOR_SERVICE_NAME,
200 if (GSS_ERROR(major))
203 /* Acceptor-Host-Name */
204 krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 1), &nameBuf);
206 major = gssEapRadiusAddAvp(minor, vps,
207 PW_GSS_ACCEPTOR_HOST_NAME,
210 if (GSS_ERROR(major))
213 if (krb5_princ_size(krbContext, krbPrinc) > 2) {
214 /* Acceptor-Service-Specific */
215 krb5_principal_data ssiPrinc = *krbPrinc;
218 krb5_princ_size(krbContext, &ssiPrinc) -= 2;
219 krb5_princ_name(krbContext, &ssiPrinc) += 2;
221 *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
222 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
224 return GSS_S_FAILURE;
227 nameBuf.length = strlen(ssi);
229 major = gssEapRadiusAddAvp(minor, vps,
230 PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
234 if (GSS_ERROR(major)) {
235 krb5_free_unparsed_name(krbContext, ssi);
238 krb5_free_unparsed_name(krbContext, ssi);
241 krbDataToGssBuffer(krb5_princ_realm(krbContext, krbPrinc), &nameBuf);
242 if (nameBuf.length != 0) {
243 /* Acceptor-Realm-Name */
244 major = gssEapRadiusAddAvp(minor, vps,
245 PW_GSS_ACCEPTOR_REALM_NAME,
248 if (GSS_ERROR(major))
253 return GSS_S_COMPLETE;
257 * Allocate a RadSec handle
260 createRadiusHandle(OM_uint32 *minor,
264 struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
265 const char *configFile = RS_CONFIG_FILE;
266 const char *configStanza = "gss-eap";
267 struct rs_alloc_scheme ralloc;
268 struct rs_error *err;
270 assert(actx->radContext == NULL);
271 assert(actx->radConn == NULL);
273 if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) {
274 *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
275 return GSS_S_FAILURE;
278 if (cred != GSS_C_NO_CREDENTIAL) {
279 if (cred->radiusConfigFile != NULL)
280 configFile = cred->radiusConfigFile;
281 if (cred->radiusConfigStanza != NULL)
282 configStanza = cred->radiusConfigStanza;
285 ralloc.calloc = GSSEAP_CALLOC;
286 ralloc.malloc = GSSEAP_MALLOC;
287 ralloc.free = GSSEAP_FREE;
288 ralloc.realloc = GSSEAP_REALLOC;
290 rs_context_set_alloc_scheme(actx->radContext, &ralloc);
292 if (rs_context_read_config(actx->radContext, configFile) != 0) {
293 err = rs_err_ctx_pop(actx->radContext);
297 if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
298 err = rs_err_conn_pop(actx->radConn);
302 /* XXX TODO rs_conn_select_server does not exist yet */
304 if (actx->radServer != NULL) {
305 if (rs_conn_select_server(actx->radConn, actx->radServer) != 0) {
306 err = rs_err_conn_pop(actx->radConn);
313 return GSS_S_COMPLETE;
316 return gssEapRadiusMapError(minor, err);
320 * Process a EAP response from the initiator.
323 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
326 gss_buffer_t inputToken,
327 gss_channel_bindings_t chanBindings,
328 gss_buffer_t outputToken)
330 OM_uint32 major, tmpMinor;
331 struct rs_connection *rconn;
332 struct rs_request *request = NULL;
333 struct rs_packet *req = NULL, *resp = NULL;
334 struct radius_packet *frreq, *frresp;
335 int sendAcceptorIdentity = 0;
337 if (ctx->acceptorCtx.radContext == NULL) {
338 /* May be NULL from an imported partial context */
339 major = createRadiusHandle(minor, cred, ctx);
340 if (GSS_ERROR(major))
343 sendAcceptorIdentity = 1;
346 rconn = ctx->acceptorCtx.radConn;
348 if (rs_packet_create_acc_request(rconn, &req, NULL, NULL) != 0) {
349 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
352 frreq = rs_packet_frpkt(req);
354 if (sendAcceptorIdentity) {
355 major = setAcceptorIdentity(minor, ctx, &frreq->vps);
356 if (GSS_ERROR(major))
360 major = gssEapRadiusAddAvp(minor, &frreq->vps,
361 PW_EAP_MESSAGE, 0, inputToken);
362 if (GSS_ERROR(major))
365 if (ctx->acceptorCtx.state.length != 0) {
366 major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
367 &ctx->acceptorCtx.state);
368 if (GSS_ERROR(major))
371 gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
374 if (rs_request_create(rconn, &request) != 0 ||
375 rs_request_send(request, req, &resp) != 0) {
376 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
380 assert(resp != NULL);
382 frresp = rs_packet_frpkt(resp);
383 switch (frresp->code) {
384 case PW_AUTHENTICATION_ACK:
385 case PW_ACCESS_CHALLENGE:
386 major = GSS_S_CONTINUE_NEEDED;
388 case PW_AUTHENTICATION_REJECT:
389 *minor = GSSEAP_RADIUS_AUTH_FAILURE;
390 major = GSS_S_DEFECTIVE_CREDENTIAL;
394 *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
395 major = GSS_S_FAILURE;
400 major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
402 if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
403 *minor = GSSEAP_MISSING_EAP_REQUEST;
404 major = GSS_S_DEFECTIVE_TOKEN;
406 } else if (GSS_ERROR(major))
409 if (frresp->code == PW_ACCESS_CHALLENGE) {
410 major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
411 &ctx->acceptorCtx.state, TRUE);
412 if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
415 ctx->acceptorCtx.vps = frresp->vps;
418 rs_conn_destroy(ctx->acceptorCtx.radConn);
419 ctx->acceptorCtx.radConn = NULL;
421 major = acceptReadyEap(minor, ctx, cred);
422 if (GSS_ERROR(major))
425 ctx->state = EAP_STATE_EXTENSIONS_REQ;
429 major = GSS_S_CONTINUE_NEEDED;
432 rs_request_destroy(request);
438 eapGssSmAcceptExtensionsReq(OM_uint32 *minor,
441 gss_buffer_t inputToken,
442 gss_channel_bindings_t chanBindings,
443 gss_buffer_t outputToken)
447 major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
448 if (GSS_ERROR(major))
451 outputToken->length = 0;
452 outputToken->value = NULL;
454 ctx->state = EAP_STATE_EXTENSIONS_RESP;
457 return GSS_S_CONTINUE_NEEDED;
461 eapGssSmAcceptExtensionsResp(OM_uint32 *minor,
464 gss_buffer_t inputToken,
465 gss_channel_bindings_t chanBindings,
466 gss_buffer_t outputToken)
470 major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
471 if (GSS_ERROR(major))
474 ctx->state = EAP_STATE_ESTABLISHED;
477 return GSS_S_COMPLETE;
481 eapGssSmAcceptEstablished(OM_uint32 *minor,
484 gss_buffer_t inputToken,
485 gss_channel_bindings_t chanBindings,
486 gss_buffer_t outputToken)
488 /* Called with already established context */
489 *minor = GSSEAP_CONTEXT_ESTABLISHED;
490 return GSS_S_BAD_STATUS;
494 makeErrorToken(OM_uint32 *minor,
495 OM_uint32 majorStatus,
496 OM_uint32 minorStatus,
497 gss_buffer_t outputToken)
499 unsigned char errorData[8];
500 gss_buffer_desc errorBuffer;
502 assert(GSS_ERROR(majorStatus));
505 * Only return error codes that the initiator could have caused,
506 * to avoid information leakage.
508 switch (minorStatus) {
509 case GSSEAP_WRONG_SIZE:
510 case GSSEAP_WRONG_MECH:
511 case GSSEAP_BAD_TOK_HEADER:
512 case GSSEAP_TOK_TRUNC:
513 case GSSEAP_BAD_DIRECTION:
514 case GSSEAP_WRONG_TOK_ID:
516 case GSSEAP_CRIT_EXT_UNAVAILABLE:
517 case GSSEAP_MISSING_REQUIRED_EXT:
518 case GSSEAP_KEY_UNAVAILABLE:
519 case GSSEAP_KEY_TOO_SHORT:
520 case GSSEAP_RADIUS_AUTH_FAILURE:
521 case GSSEAP_UNKNOWN_RADIUS_CODE:
522 case GSSEAP_MISSING_EAP_REQUEST:
525 if (IS_RADIUS_ERROR(minorStatus))
526 /* Squash RADIUS error codes */
527 minorStatus = GSSEAP_GENERIC_RADIUS_ERROR;
529 /* Don't return system error codes */
530 return GSS_S_COMPLETE;
533 minorStatus -= ERROR_TABLE_BASE_eapg;
535 store_uint32_be(majorStatus, &errorData[0]);
536 store_uint32_be(minorStatus, &errorData[4]);
538 errorBuffer.length = sizeof(errorData);
539 errorBuffer.value = errorData;
541 return duplicateBuffer(minor, &errorBuffer, outputToken);
544 static struct gss_eap_acceptor_sm {
545 enum gss_eap_token_type inputTokenType;
546 enum gss_eap_token_type outputTokenType;
547 OM_uint32 (*processToken)(OM_uint32 *,
551 gss_channel_bindings_t,
553 } eapGssAcceptorSm[] = {
554 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptIdentity },
555 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptAuthenticate },
556 { TOK_TYPE_EXT_REQ, TOK_TYPE_NONE, eapGssSmAcceptExtensionsReq },
557 { TOK_TYPE_NONE, TOK_TYPE_EXT_RESP, eapGssSmAcceptExtensionsResp },
558 { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmAcceptEstablished },
559 { TOK_TYPE_NONE, TOK_TYPE_CONTEXT_ERR, NULL },
560 #ifdef GSSEAP_ENABLE_REAUTH
561 { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmAcceptGssReauth },
566 gss_accept_sec_context(OM_uint32 *minor,
567 gss_ctx_id_t *context_handle,
569 gss_buffer_t input_token,
570 gss_channel_bindings_t input_chan_bindings,
571 gss_name_t *src_name,
573 gss_buffer_t output_token,
574 OM_uint32 *ret_flags,
576 gss_cred_id_t *delegated_cred_handle)
579 OM_uint32 tmpMajor, tmpMinor;
580 gss_ctx_id_t ctx = *context_handle;
581 struct gss_eap_acceptor_sm *sm = NULL;
582 gss_buffer_desc innerInputToken = GSS_C_EMPTY_BUFFER;
583 gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
584 enum gss_eap_token_type tokType;
585 int initialContextToken = 0;
589 output_token->length = 0;
590 output_token->value = NULL;
592 if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
593 *minor = GSSEAP_TOK_TRUNC;
594 return GSS_S_DEFECTIVE_TOKEN;
597 if (ctx == GSS_C_NO_CONTEXT) {
598 major = gssEapAllocContext(minor, &ctx);
599 if (GSS_ERROR(major))
602 initialContextToken = 1;
603 *context_handle = ctx;
606 GSSEAP_MUTEX_LOCK(&ctx->mutex);
608 /* Validate and lock credentials */
609 if (cred != GSS_C_NO_CREDENTIAL) {
610 GSSEAP_MUTEX_LOCK(&cred->mutex);
612 if ((cred->flags & CRED_FLAG_ACCEPT) == 0) {
613 *minor = GSSEAP_CRED_USAGE_MISMATCH;
614 major = GSS_S_NO_CRED;
619 sm = &eapGssAcceptorSm[ctx->state];
621 major = gssEapVerifyToken(minor, ctx, input_token,
622 &tokType, &innerInputToken);
623 if (GSS_ERROR(major))
626 if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
627 *minor = GSSEAP_CRED_MECH_MISMATCH;
628 major = GSS_S_BAD_MECH;
632 #ifdef GSSEAP_ENABLE_REAUTH
634 * If we're built with fast reauthentication support, it's valid
635 * for an initiator to send a GSS reauthentication token as its
636 * initial context token, causing us to short-circuit the state
637 * machine and process Kerberos GSS messages instead.
639 if (tokType == TOK_TYPE_GSS_REAUTH && initialContextToken) {
640 ctx->state = EAP_STATE_KRB_REAUTH_GSS;
643 if (tokType != sm->inputTokenType) {
644 *minor = GSSEAP_WRONG_TOK_ID;
645 major = GSS_S_DEFECTIVE_TOKEN;
650 sm = &eapGssAcceptorSm[ctx->state];
652 major = (sm->processToken)(minor,
658 if (GSS_ERROR(major)) {
659 /* Possibly generate an error token */
660 tmpMajor = makeErrorToken(&tmpMinor, major, *minor, &innerOutputToken);
661 if (GSS_ERROR(tmpMajor)) {
666 sm = &eapGssAcceptorSm[EAP_STATE_ERROR];
669 } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.length == 0);
671 if (mech_type != NULL) {
672 if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
673 duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
675 if (ret_flags != NULL)
676 *ret_flags = ctx->gssFlags;
677 if (delegated_cred_handle != NULL)
678 *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
680 if (major == GSS_S_COMPLETE) {
681 if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
682 major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
683 if (GSS_ERROR(major))
686 if (time_rec != NULL) {
687 major = gssEapContextTime(&tmpMinor, ctx, time_rec);
688 if (GSS_ERROR(major))
693 assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
696 if (innerOutputToken.value != NULL) {
697 tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
698 sm->outputTokenType, output_token);
699 if (GSS_ERROR(tmpMajor)) {
707 if (cred != GSS_C_NO_CREDENTIAL)
708 GSSEAP_MUTEX_UNLOCK(&cred->mutex);
709 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
711 if (GSS_ERROR(major))
712 gssEapReleaseContext(&tmpMinor, context_handle);
714 gss_release_buffer(&tmpMinor, &innerOutputToken);
719 #ifdef GSSEAP_ENABLE_REAUTH
721 acceptReadyKrb(OM_uint32 *minor,
724 const gss_name_t initiator,
730 major = gssEapGlueToMechName(minor, initiator, &ctx->initiatorName);
731 if (GSS_ERROR(major))
734 if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
735 major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
736 if (GSS_ERROR(major))
740 major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
741 if (GSS_ERROR(major))
744 ctx->state = EAP_STATE_ESTABLISHED;
747 return GSS_S_COMPLETE;
751 eapGssSmAcceptGssReauth(OM_uint32 *minor,
754 gss_buffer_t inputToken,
755 gss_channel_bindings_t chanBindings,
756 gss_buffer_t outputToken)
758 OM_uint32 major, tmpMinor;
759 gss_cred_id_t krbCred = GSS_C_NO_CREDENTIAL;
760 gss_name_t krbInitiator = GSS_C_NO_NAME;
761 gss_OID mech = GSS_C_NO_OID;
762 OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
764 ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
766 if (cred != GSS_C_NO_CREDENTIAL)
767 krbCred = cred->krbCred;
769 major = gssAcceptSecContext(minor,
780 if (major == GSS_S_COMPLETE) {
781 major = acceptReadyKrb(minor, ctx, cred,
782 krbInitiator, mech, timeRec);
785 ctx->gssFlags = gssFlags;
787 gssReleaseName(&tmpMinor, &krbInitiator);
791 #endif /* GSSEAP_ENABLE_REAUTH */