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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,
49 gss_channel_bindings_t chanBindings,
50 gss_buffer_t inputToken,
51 gss_buffer_t outputToken,
56 * Mark an acceptor context as ready for cryptographic operations
59 acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
61 OM_uint32 major, tmpMinor;
63 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
65 /* Cache encryption type derived from selected mechanism OID */
66 major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
67 &ctx->encryptionType);
71 gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
73 major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
74 PW_USER_NAME, 0, &vp);
75 if (major == GSS_S_COMPLETE) {
76 nameBuf.length = vp->length;
77 nameBuf.value = vp->vp_strvalue;
79 ctx->gssFlags |= GSS_C_ANON_FLAG;
82 major = gssEapImportName(minor, &nameBuf,
83 (ctx->gssFlags & GSS_C_ANON_FLAG) ?
84 GSS_C_NT_ANONYMOUS : GSS_C_NT_USER_NAME,
89 major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
90 PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
91 if (GSS_ERROR(major)) {
92 *minor = GSSEAP_KEY_UNAVAILABLE;
93 return GSS_S_UNAVAILABLE;
96 major = gssEapDeriveRfc3961Key(minor,
101 if (GSS_ERROR(major))
104 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
106 if (GSS_ERROR(major))
109 major = sequenceInit(minor,
110 &ctx->seqState, ctx->recvSeq,
111 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
112 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
114 if (GSS_ERROR(major))
117 major = gssEapCreateAttrContext(minor, cred, ctx,
118 &ctx->initiatorName->attrCtx,
120 if (GSS_ERROR(major))
124 return GSS_S_COMPLETE;
128 eapGssSmAcceptAcceptorName(OM_uint32 *minor,
135 gss_channel_bindings_t chanBindings,
136 gss_buffer_t inputToken,
137 gss_buffer_t outputToken,
142 /* XXX TODO import and validate name from inputToken */
144 if (ctx->acceptorName != GSS_C_NO_NAME) {
145 /* Send desired target name to acceptor */
146 major = gssEapDisplayName(minor, ctx->acceptorName,
148 if (GSS_ERROR(major))
152 return GSS_S_CONTINUE_NEEDED;
157 eapGssSmAcceptVendorInfo(OM_uint32 *minor,
164 gss_channel_bindings_t chanBindings,
165 gss_buffer_t inputToken,
166 gss_buffer_t outputToken,
169 fprintf(stderr, "GSS-EAP: vendor: %.*s\n",
170 (int)inputToken->length, (char *)inputToken->value);
172 return GSS_S_CONTINUE_NEEDED;
178 * Emit a identity EAP request to force the initiator (peer) to identify
182 eapGssSmAcceptIdentity(OM_uint32 *minor,
189 gss_channel_bindings_t chanBindings,
190 gss_buffer_t inputToken,
191 gss_buffer_t outputToken,
195 struct wpabuf *reqData;
196 gss_buffer_desc pktBuffer;
198 if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
199 *minor = GSSEAP_CRED_MECH_MISMATCH;
200 return GSS_S_BAD_MECH;
203 if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
204 *minor = GSSEAP_WRONG_SIZE;
205 return GSS_S_DEFECTIVE_TOKEN;
208 reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0,
209 EAP_CODE_REQUEST, 0);
210 if (reqData == NULL) {
212 return GSS_S_FAILURE;
215 pktBuffer.length = wpabuf_len(reqData);
216 pktBuffer.value = (void *)wpabuf_head(reqData);
218 major = duplicateBuffer(minor, &pktBuffer, outputToken);
219 if (GSS_ERROR(major))
222 wpabuf_free(reqData);
224 GSSEAP_SM_TRANSITION_NEXT(ctx);
228 return GSS_S_CONTINUE_NEEDED;
232 * Returns TRUE if the input token contains an EAP identity response.
235 isIdentityResponseP(gss_buffer_t inputToken)
237 struct wpabuf respData;
239 wpabuf_set(&respData, inputToken->value, inputToken->length);
241 return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
245 * Save the asserted initiator identity from the EAP identity response.
248 importInitiatorIdentity(OM_uint32 *minor,
250 gss_buffer_t inputToken)
253 struct wpabuf respData;
254 const unsigned char *pos;
256 gss_buffer_desc nameBuf;
258 wpabuf_set(&respData, inputToken->value, inputToken->length);
260 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
263 *minor = GSSEAP_PEER_BAD_MESSAGE;
264 return GSS_S_DEFECTIVE_TOKEN;
267 nameBuf.value = (void *)pos;
268 nameBuf.length = len;
270 gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
272 return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
273 &ctx->initiatorName);
277 * Pass the asserted initiator identity to the authentication server.
280 setInitiatorIdentity(OM_uint32 *minor,
284 OM_uint32 major, tmpMinor;
285 gss_buffer_desc nameBuf;
288 * We should have got an EAP identity response, but if we didn't, then
289 * we will just avoid sending User-Name. Note that radsecproxy requires
290 * User-Name to be sent on every request (presumably so it can remain
293 if (ctx->initiatorName != GSS_C_NO_NAME) {
294 major = gssEapDisplayName(minor, ctx->initiatorName, &nameBuf, NULL);
295 if (GSS_ERROR(major))
298 major = gssEapRadiusAddAvp(minor, vps, PW_USER_NAME, 0, &nameBuf);
299 if (GSS_ERROR(major))
302 gss_release_buffer(&tmpMinor, &nameBuf);
306 return GSS_S_COMPLETE;
310 * Pass the asserted acceptor identity to the authentication server.
313 setAcceptorIdentity(OM_uint32 *minor,
318 gss_buffer_desc nameBuf;
319 krb5_context krbContext = NULL;
320 krb5_principal krbPrinc;
321 struct rs_context *rc = ctx->acceptorCtx.radContext;
325 if (ctx->acceptorName == GSS_C_NO_NAME) {
327 return GSS_S_COMPLETE;
330 if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
331 *minor = GSSEAP_BAD_SERVICE_NAME;
332 return GSS_S_BAD_NAME;
335 GSSEAP_KRB_INIT(&krbContext);
337 krbPrinc = ctx->acceptorName->krbPrincipal;
338 assert(krbPrinc != NULL);
339 assert(KRB_PRINC_LENGTH(krbPrinc) >= 2);
341 /* Acceptor-Service-Name */
342 krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
344 major = gssEapRadiusAddAvp(minor, vps,
345 PW_GSS_ACCEPTOR_SERVICE_NAME,
348 if (GSS_ERROR(major))
351 /* Acceptor-Host-Name */
352 krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
354 major = gssEapRadiusAddAvp(minor, vps,
355 PW_GSS_ACCEPTOR_HOST_NAME,
358 if (GSS_ERROR(major))
361 if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
362 /* Acceptor-Service-Specific */
363 krb5_principal_data ssiPrinc = *krbPrinc;
366 KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
367 KRB_PRINC_NAME(&ssiPrinc) += 2;
369 *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
370 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
372 return GSS_S_FAILURE;
375 nameBuf.length = strlen(ssi);
377 major = gssEapRadiusAddAvp(minor, vps,
378 PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
382 if (GSS_ERROR(major)) {
383 krb5_free_unparsed_name(krbContext, ssi);
386 krb5_free_unparsed_name(krbContext, ssi);
389 krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
390 if (nameBuf.length != 0) {
391 /* Acceptor-Realm-Name */
392 major = gssEapRadiusAddAvp(minor, vps,
393 PW_GSS_ACCEPTOR_REALM_NAME,
396 if (GSS_ERROR(major))
401 return GSS_S_COMPLETE;
405 * Allocate a RadSec handle
408 createRadiusHandle(OM_uint32 *minor,
412 struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
413 const char *configFile = RS_CONFIG_FILE;
414 const char *configStanza = "gss-eap";
415 struct rs_alloc_scheme ralloc;
416 struct rs_error *err;
418 assert(actx->radContext == NULL);
419 assert(actx->radConn == NULL);
421 if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) {
422 *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
423 return GSS_S_FAILURE;
426 if (cred->radiusConfigFile != NULL)
427 configFile = cred->radiusConfigFile;
428 if (cred->radiusConfigStanza != NULL)
429 configStanza = cred->radiusConfigStanza;
431 ralloc.calloc = GSSEAP_CALLOC;
432 ralloc.malloc = GSSEAP_MALLOC;
433 ralloc.free = GSSEAP_FREE;
434 ralloc.realloc = GSSEAP_REALLOC;
436 rs_context_set_alloc_scheme(actx->radContext, &ralloc);
438 if (rs_context_read_config(actx->radContext, configFile) != 0) {
439 err = rs_err_ctx_pop(actx->radContext);
443 if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
444 err = rs_err_conn_pop(actx->radConn);
448 if (actx->radServer != NULL) {
449 if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
450 err = rs_err_conn_pop(actx->radConn);
456 return GSS_S_COMPLETE;
459 return gssEapRadiusMapError(minor, err);
463 * Process a EAP response from the initiator.
466 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
473 gss_channel_bindings_t chanBindings,
474 gss_buffer_t inputToken,
475 gss_buffer_t outputToken,
478 OM_uint32 major, tmpMinor;
479 struct rs_connection *rconn;
480 struct rs_request *request = NULL;
481 struct rs_packet *req = NULL, *resp = NULL;
482 struct radius_packet *frreq, *frresp;
484 if (ctx->acceptorCtx.radContext == NULL) {
485 /* May be NULL from an imported partial context */
486 major = createRadiusHandle(minor, cred, ctx);
487 if (GSS_ERROR(major))
491 if (isIdentityResponseP(inputToken)) {
492 major = importInitiatorIdentity(minor, ctx, inputToken);
493 if (GSS_ERROR(major))
497 rconn = ctx->acceptorCtx.radConn;
499 if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
500 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
503 frreq = rs_packet_frpkt(req);
505 major = setInitiatorIdentity(minor, ctx, &frreq->vps);
506 if (GSS_ERROR(major))
509 major = setAcceptorIdentity(minor, ctx, &frreq->vps);
510 if (GSS_ERROR(major))
513 major = gssEapRadiusAddAvp(minor, &frreq->vps,
514 PW_EAP_MESSAGE, 0, inputToken);
515 if (GSS_ERROR(major))
518 if (ctx->acceptorCtx.state.length != 0) {
519 major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
520 &ctx->acceptorCtx.state);
521 if (GSS_ERROR(major))
524 gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
527 if (rs_request_create(rconn, &request) != 0) {
528 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
532 rs_request_add_reqpkt(request, req);
535 if (rs_request_send(request, &resp) != 0) {
536 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
540 assert(resp != NULL);
542 frresp = rs_packet_frpkt(resp);
543 switch (frresp->code) {
544 case PW_AUTHENTICATION_ACK:
545 case PW_ACCESS_CHALLENGE:
547 case PW_AUTHENTICATION_REJECT:
548 *minor = GSSEAP_RADIUS_AUTH_FAILURE;
549 major = GSS_S_DEFECTIVE_CREDENTIAL;
553 *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
554 major = GSS_S_FAILURE;
559 major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
561 if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
562 *minor = GSSEAP_MISSING_EAP_REQUEST;
563 major = GSS_S_DEFECTIVE_TOKEN;
565 } else if (GSS_ERROR(major))
568 if (frresp->code == PW_ACCESS_CHALLENGE) {
569 major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
570 &ctx->acceptorCtx.state, TRUE);
571 if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
574 ctx->acceptorCtx.vps = frresp->vps;
577 rs_conn_destroy(ctx->acceptorCtx.radConn);
578 ctx->acceptorCtx.radConn = NULL;
580 major = acceptReadyEap(minor, ctx, cred);
581 if (GSS_ERROR(major))
584 GSSEAP_SM_TRANSITION_NEXT(ctx);
587 major = GSS_S_CONTINUE_NEEDED;
592 rs_request_destroy(request);
594 rs_packet_destroy(req);
600 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
607 gss_channel_bindings_t chanBindings,
608 gss_buffer_t inputToken,
609 gss_buffer_t outputToken,
612 OM_uint32 major, tmpMinor;
613 gss_iov_buffer_desc iov[2];
615 iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE;
616 iov[0].buffer.length = 0;
617 iov[0].buffer.value = NULL;
619 iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM;
620 iov[1].buffer = *inputToken;
622 major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
623 iov, 2, TOK_TYPE_WRAP);
624 if (GSS_ERROR(major))
625 return GSS_S_BAD_BINDINGS;
627 if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS &&
628 !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) {
629 major = GSS_S_BAD_BINDINGS;
630 *minor = GSSEAP_BINDINGS_MISMATCH;
632 major = GSS_S_CONTINUE_NEEDED;
636 gss_release_buffer(&tmpMinor, &iov[0].buffer);
641 #ifdef GSSEAP_ENABLE_REAUTH
643 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
650 gss_channel_bindings_t chanBindings,
651 gss_buffer_t inputToken,
652 gss_buffer_t outputToken,
658 * If we're built with fast reauthentication enabled, then
659 * fabricate a ticket from the initiator to ourselves.
661 major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
662 if (major == GSS_S_UNAVAILABLE)
663 major = GSS_S_COMPLETE;
664 if (major == GSS_S_COMPLETE)
665 major = GSS_S_CONTINUE_NEEDED;
672 eapGssSmAcceptCompleteInitiatorExts(OM_uint32 *minor,
679 gss_channel_bindings_t chanBindings,
680 gss_buffer_t inputToken,
681 gss_buffer_t outputToken,
684 GSSEAP_SM_TRANSITION_NEXT(ctx);
688 return GSS_S_CONTINUE_NEEDED;
692 eapGssSmAcceptCompleteAcceptorExts(OM_uint32 *minor,
699 gss_channel_bindings_t chanBindings,
700 gss_buffer_t inputToken,
701 gss_buffer_t outputToken,
704 GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
707 *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
709 return GSS_S_COMPLETE;
712 static struct gss_eap_sm eapGssAcceptorSm[] = {
714 ITOK_TYPE_ACCEPTOR_NAME_REQ,
715 ITOK_TYPE_ACCEPTOR_NAME_RESP,
716 GSSEAP_STATE_INITIAL,
718 eapGssSmAcceptAcceptorName
722 ITOK_TYPE_VENDOR_INFO,
724 GSSEAP_STATE_INITIAL,
726 eapGssSmAcceptVendorInfo,
729 #ifdef GSSEAP_ENABLE_REAUTH
731 ITOK_TYPE_REAUTH_REQ,
732 ITOK_TYPE_REAUTH_RESP,
733 GSSEAP_STATE_INITIAL,
735 eapGssSmAcceptGssReauth,
741 GSSEAP_STATE_INITIAL,
742 SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
743 eapGssSmAcceptIdentity,
748 GSSEAP_STATE_AUTHENTICATE,
749 SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
750 eapGssSmAcceptAuthenticate
753 ITOK_TYPE_GSS_CHANNEL_BINDINGS,
755 GSSEAP_STATE_INITIATOR_EXTS,
756 SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
757 eapGssSmAcceptGssChannelBindings,
762 GSSEAP_STATE_INITIATOR_EXTS,
764 eapGssSmAcceptCompleteInitiatorExts,
766 #ifdef GSSEAP_ENABLE_REAUTH
769 ITOK_TYPE_REAUTH_CREDS,
770 GSSEAP_STATE_ACCEPTOR_EXTS,
772 eapGssSmAcceptReauthCreds,
778 GSSEAP_STATE_ACCEPTOR_EXTS,
780 eapGssSmAcceptCompleteAcceptorExts
785 gss_accept_sec_context(OM_uint32 *minor,
786 gss_ctx_id_t *context_handle,
788 gss_buffer_t input_token,
789 gss_channel_bindings_t input_chan_bindings,
790 gss_name_t *src_name,
792 gss_buffer_t output_token,
793 OM_uint32 *ret_flags,
795 gss_cred_id_t *delegated_cred_handle)
797 OM_uint32 major, tmpMinor;
798 gss_ctx_id_t ctx = *context_handle;
802 output_token->length = 0;
803 output_token->value = NULL;
805 if (src_name != NULL)
806 *src_name = GSS_C_NO_NAME;
808 if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
809 *minor = GSSEAP_TOK_TRUNC;
810 return GSS_S_DEFECTIVE_TOKEN;
813 if (ctx == GSS_C_NO_CONTEXT) {
814 major = gssEapAllocContext(minor, &ctx);
815 if (GSS_ERROR(major))
818 *context_handle = ctx;
821 GSSEAP_MUTEX_LOCK(&ctx->mutex);
823 if (cred == GSS_C_NO_CREDENTIAL) {
824 if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
825 major = gssEapAcquireCred(minor,
834 if (GSS_ERROR(major))
838 cred = ctx->defaultCred;
841 GSSEAP_MUTEX_LOCK(&cred->mutex);
843 if (cred->name != GSS_C_NO_NAME) {
844 major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
845 if (GSS_ERROR(major))
849 major = gssEapSmStep(minor,
860 sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
861 if (GSS_ERROR(major))
864 if (mech_type != NULL) {
865 if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
866 duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
868 if (ret_flags != NULL)
869 *ret_flags = ctx->gssFlags;
870 if (delegated_cred_handle != NULL)
871 *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
873 if (major == GSS_S_COMPLETE) {
874 if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
875 major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
876 if (GSS_ERROR(major))
879 if (time_rec != NULL) {
880 major = gssEapContextTime(&tmpMinor, ctx, time_rec);
881 if (GSS_ERROR(major))
886 assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
889 if (cred != GSS_C_NO_CREDENTIAL)
890 GSSEAP_MUTEX_UNLOCK(&cred->mutex);
891 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
893 if (GSS_ERROR(major))
894 gssEapReleaseContext(&tmpMinor, context_handle);
899 #ifdef GSSEAP_ENABLE_REAUTH
901 acceptReadyKrb(OM_uint32 *minor,
904 const gss_name_t initiator,
910 major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
911 if (GSS_ERROR(major))
914 major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
915 if (GSS_ERROR(major))
919 return GSS_S_COMPLETE;
923 eapGssSmAcceptGssReauth(OM_uint32 *minor,
930 gss_channel_bindings_t chanBindings,
931 gss_buffer_t inputToken,
932 gss_buffer_t outputToken,
935 OM_uint32 major, tmpMinor;
936 gss_name_t krbInitiator = GSS_C_NO_NAME;
937 OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
940 * If we're built with fast reauthentication support, it's valid
941 * for an initiator to send a GSS reauthentication token as its
942 * initial context token, causing us to short-circuit the state
943 * machine and process Kerberos GSS messages instead.
946 ctx->flags |= CTX_FLAG_KRB_REAUTH;
948 major = gssAcceptSecContext(minor,
959 if (major == GSS_S_COMPLETE) {
960 major = acceptReadyKrb(minor, ctx, cred,
961 krbInitiator, mech, timeRec);
962 if (major == GSS_S_COMPLETE) {
963 GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
967 ctx->gssFlags = gssFlags;
969 gssReleaseName(&tmpMinor, &krbInitiator);
973 #endif /* GSSEAP_ENABLE_REAUTH */