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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 a 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 vp = pairfind(ctx->acceptorCtx.avps, PW_USER_NAME);
65 nameBuf.length = vp->length;
66 nameBuf.value = vp->vp_strvalue;
68 ctx->gssFlags |= GSS_C_ANON_FLAG;
71 major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
76 ctx->initiatorName->attrCtx = gssEapCreateAttrContext(cred, ctx);
78 major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.avps,
79 PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
80 if (major == GSS_S_COMPLETE && ctx->encryptionType != ENCTYPE_NULL) {
81 major = gssEapDeriveRfc3961Key(minor,
89 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
95 * draft-howlett-eap-gss says that integrity/confidentialty should
96 * always be advertised as available, but if we have no keying
97 * material it seems confusing to the caller to advertise this.
99 ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
100 ctx->encryptionType = ENCTYPE_NULL;
103 major = sequenceInit(minor,
104 &ctx->seqState, ctx->recvSeq,
105 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
106 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
108 if (GSS_ERROR(major))
111 return GSS_S_COMPLETE;
115 eapGssSmAcceptIdentity(OM_uint32 *minor,
118 gss_buffer_t inputToken,
119 gss_channel_bindings_t chanBindings,
120 gss_buffer_t outputToken)
125 unsigned char data[5];
127 gss_buffer_desc pktBuffer;
129 if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0)
130 return GSS_S_DEFECTIVE_TOKEN;
132 assert(ctx->acceptorName == GSS_C_NO_NAME);
134 if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
135 major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
136 if (GSS_ERROR(major))
140 pkt.pdu.code = EAP_CODE_REQUEST;
141 pkt.pdu.identifier = 0;
142 pkt.pdu.length = htons(sizeof(pkt.data));
143 pkt.data[4] = EAP_TYPE_IDENTITY;
145 pktBuffer.length = sizeof(pkt.data);
146 pktBuffer.value = pkt.data;
148 major = duplicateBuffer(minor, &pktBuffer, outputToken);
149 if (GSS_ERROR(major))
152 ctx->state = EAP_STATE_AUTHENTICATE;
154 return GSS_S_CONTINUE_NEEDED;
158 setAcceptorIdentity(OM_uint32 *minor,
163 gss_buffer_desc nameBuf;
164 krb5_context krbContext = NULL;
165 krb5_principal krbPrinc;
166 struct rs_handle *rh = ctx->acceptorCtx.radHandle;
170 /* Awaits further specification */
171 if (ctx->acceptorName == GSS_C_NO_NAME)
172 return GSS_S_COMPLETE;
174 GSSEAP_KRB_INIT(&krbContext);
176 krbPrinc = ctx->acceptorName->krbPrincipal;
177 assert(krbPrinc != NULL);
179 if (krb5_princ_size(krbContext, krbPrinc) < 2)
180 return GSS_S_BAD_NAME;
182 /* Acceptor-Service-Name */
183 krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 0), &nameBuf);
185 major = gssEapRadiusAddAvp(minor, rh, avps,
186 PW_GSS_ACCEPTOR_SERVICE_NAME,
189 if (GSS_ERROR(major))
192 /* Acceptor-Host-Name */
193 krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 1), &nameBuf);
195 major = gssEapRadiusAddAvp(minor, rh, avps,
196 PW_GSS_ACCEPTOR_HOST_NAME,
199 if (GSS_ERROR(major))
202 if (krb5_princ_size(krbContext, krbPrinc) > 2) {
203 /* Acceptor-Service-Specific */
204 krb5_principal_data ssiPrinc = *krbPrinc;
207 krb5_princ_size(krbContext, &ssiPrinc) -= 2;
208 krb5_princ_name(krbContext, &ssiPrinc) += 2;
210 *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
211 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
213 return GSS_S_FAILURE;
216 nameBuf.length = strlen(ssi);
218 major = gssEapRadiusAddAvp(minor, rh, avps,
219 PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
223 if (GSS_ERROR(major)) {
224 krb5_free_unparsed_name(krbContext, ssi);
227 krb5_free_unparsed_name(krbContext, ssi);
230 krbDataToGssBuffer(krb5_princ_realm(krbContext, krbPrinc), &nameBuf);
231 if (nameBuf.length != 0) {
232 /* Acceptor-Realm-Name */
233 major = gssEapRadiusAddAvp(minor, rh, avps,
234 PW_GSS_ACCEPTOR_REALM_NAME,
237 if (GSS_ERROR(major))
241 return GSS_S_COMPLETE;
245 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
248 gss_buffer_t inputToken,
249 gss_channel_bindings_t chanBindings,
250 gss_buffer_t outputToken)
252 OM_uint32 major, tmpMinor;
253 struct rs_handle *rh;
254 struct rs_connection *rconn;
255 struct rs_packet *req = NULL, *resp = NULL;
256 struct radius_packet *frreq, *frresp;
257 int sendAcceptorIdentity = 0;
259 if (ctx->acceptorCtx.radHandle == NULL) {
260 /* May be NULL from an imported partial context */
261 major = gssEapRadiusAllocConn(minor, cred, ctx);
262 if (GSS_ERROR(major))
265 sendAcceptorIdentity = 1;
268 rh = ctx->acceptorCtx.radHandle;
269 rconn = ctx->acceptorCtx.radConn;
271 if (rs_packet_create_acc_request(rconn, &req, NULL, NULL) != 0) {
272 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
275 frreq = rs_packet_frpkt(req);
277 if (sendAcceptorIdentity) {
278 major = setAcceptorIdentity(minor, ctx, &frreq->vps);
279 if (GSS_ERROR(major))
283 major = gssEapRadiusAddAvp(minor, rh, &frreq->vps, PW_EAP_MESSAGE, 0, inputToken);
284 if (GSS_ERROR(major))
287 if (ctx->acceptorCtx.state.length != 0) {
288 major = gssEapRadiusAddAvp(minor, rh, &frreq->vps, PW_STATE, 0,
289 &ctx->acceptorCtx.state);
290 if (GSS_ERROR(major))
293 gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
296 if (rs_packet_send(req, NULL) != 0) {
297 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
302 if (rs_conn_receive_packet(rconn, &resp) != 0) {
303 major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
307 frresp = rs_packet_frpkt(resp);
308 switch (frresp->code) {
309 case PW_AUTHENTICATION_ACK:
310 case PW_ACCESS_CHALLENGE:
311 major = GSS_S_CONTINUE_NEEDED;
313 case PW_AUTHENTICATION_REJECT:
314 major = GSS_S_DEFECTIVE_CREDENTIAL;
318 major = GSS_S_FAILURE;
323 major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
325 if ((major == GSS_S_UNAVAILABLE && frresp->code != PW_AUTHENTICATION_ACK) ||
329 if (frresp->code == PW_ACCESS_CHALLENGE) {
330 major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
331 &ctx->acceptorCtx.state, TRUE);
332 if (major != GSS_S_UNAVAILABLE && GSS_ERROR(major))
335 ctx->acceptorCtx.avps = frresp->vps;
338 major = acceptReadyEap(minor, ctx, cred);
339 if (GSS_ERROR(major))
342 ctx->state = EAP_STATE_EXTENSIONS_REQ;
345 major = GSS_S_CONTINUE_NEEDED;
348 rs_packet_destroy(req);
349 rs_packet_destroy(resp);
355 acceptGssChannelBindings(OM_uint32 *minor,
358 gss_buffer_t inputToken,
359 gss_channel_bindings_t chanBindings)
361 OM_uint32 major, tmpMinor;
362 gss_iov_buffer_desc iov[2];
364 iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE;
365 iov[0].buffer.length = 0;
366 iov[0].buffer.value = NULL;
368 iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM;
369 iov[1].buffer = *inputToken;
371 major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
372 iov, 2, TOK_TYPE_WRAP);
373 if (GSS_ERROR(major))
376 if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS &&
377 !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) {
378 major = GSS_S_BAD_BINDINGS;
380 major = GSS_S_CONTINUE_NEEDED;
383 gss_release_buffer(&tmpMinor, &iov[0].buffer);
389 eapGssSmAcceptExtensionsReq(OM_uint32 *minor,
392 gss_buffer_t inputToken,
393 gss_channel_bindings_t chanBindings,
394 gss_buffer_t outputToken)
398 outputToken->length = 0;
399 outputToken->value = NULL;
401 major = acceptGssChannelBindings(minor, ctx, cred, inputToken,
403 if (GSS_ERROR(major))
406 ctx->state = EAP_STATE_EXTENSIONS_RESP;
408 return GSS_S_CONTINUE_NEEDED;
412 eapGssSmAcceptExtensionsResp(OM_uint32 *minor,
415 gss_buffer_t inputToken,
416 gss_channel_bindings_t chanBindings,
417 gss_buffer_t outputToken)
419 OM_uint32 major, tmpMinor;
420 gss_buffer_desc credsToken = GSS_C_EMPTY_BUFFER;
422 #ifdef GSSEAP_ENABLE_REAUTH
424 * If we're built with fast reauthentication enabled, then
425 * fabricate a ticket from the initiator to ourselves.
426 * Otherwise return an empty token.
428 major = gssEapMakeReauthCreds(minor, ctx, cred, &credsToken);
429 if (GSS_ERROR(major))
432 credsToken.value = "";
433 #endif /* GSSEAP_ENABLE_REAUTH */
435 major = duplicateBuffer(minor, &credsToken, outputToken);
436 if (GSS_ERROR(major)) {
437 gss_release_buffer(&tmpMinor, &credsToken);
441 #ifdef GSSEAP_ENABLE_REAUTH
442 gss_release_buffer(&tmpMinor, &credsToken);
445 ctx->state = EAP_STATE_ESTABLISHED;
447 return GSS_S_COMPLETE;
451 eapGssSmAcceptEstablished(OM_uint32 *minor,
454 gss_buffer_t inputToken,
455 gss_channel_bindings_t chanBindings,
456 gss_buffer_t outputToken)
458 /* Called with already established context */
460 return GSS_S_BAD_STATUS;
463 static struct gss_eap_acceptor_sm {
464 enum gss_eap_token_type inputTokenType;
465 enum gss_eap_token_type outputTokenType;
466 OM_uint32 (*processToken)(OM_uint32 *,
470 gss_channel_bindings_t,
472 } eapGssAcceptorSm[] = {
473 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptIdentity },
474 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptAuthenticate },
475 { TOK_TYPE_EXT_REQ, TOK_TYPE_NONE, eapGssSmAcceptExtensionsReq },
476 { TOK_TYPE_NONE, TOK_TYPE_EXT_RESP, eapGssSmAcceptExtensionsResp },
477 { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmAcceptEstablished },
478 #ifdef GSSEAP_ENABLE_REAUTH
479 { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmAcceptGssReauth },
484 gss_accept_sec_context(OM_uint32 *minor,
485 gss_ctx_id_t *context_handle,
487 gss_buffer_t input_token,
488 gss_channel_bindings_t input_chan_bindings,
489 gss_name_t *src_name,
491 gss_buffer_t output_token,
492 OM_uint32 *ret_flags,
494 gss_cred_id_t *delegated_cred_handle)
497 OM_uint32 tmpMajor, tmpMinor;
498 gss_ctx_id_t ctx = *context_handle;
499 struct gss_eap_acceptor_sm *sm = NULL;
500 gss_buffer_desc innerInputToken = GSS_C_EMPTY_BUFFER;
501 gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
502 enum gss_eap_token_type tokType;
503 int initialContextToken = 0;
507 output_token->length = 0;
508 output_token->value = NULL;
510 if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
511 return GSS_S_DEFECTIVE_TOKEN;
514 if (ctx == GSS_C_NO_CONTEXT) {
515 major = gssEapAllocContext(minor, &ctx);
516 if (GSS_ERROR(major))
519 initialContextToken = 1;
520 *context_handle = ctx;
523 GSSEAP_MUTEX_LOCK(&ctx->mutex);
525 /* Validate and lock credentials */
526 if (cred != GSS_C_NO_CREDENTIAL) {
527 GSSEAP_MUTEX_LOCK(&cred->mutex);
529 if ((cred->flags & CRED_FLAG_ACCEPT) == 0) {
530 major = GSS_S_NO_CRED;
535 sm = &eapGssAcceptorSm[ctx->state];
537 major = gssEapVerifyToken(minor, ctx, input_token,
538 &tokType, &innerInputToken);
539 if (GSS_ERROR(major))
542 if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
543 major = GSS_S_BAD_MECH;
547 #ifdef GSSEAP_ENABLE_REAUTH
549 * If we're built with fast reauthentication support, it's valid
550 * for an initiator to send a GSS reauthentication token as its
551 * initial context token, causing us to short-circuit the state
552 * machine and process Kerberos GSS messages instead.
554 if (tokType == TOK_TYPE_GSS_REAUTH && initialContextToken) {
555 ctx->state = EAP_STATE_KRB_REAUTH_GSS;
558 if (tokType != sm->inputTokenType) {
559 major = GSS_S_DEFECTIVE_TOKEN;
564 sm = &eapGssAcceptorSm[ctx->state];
566 major = (sm->processToken)(minor,
572 if (GSS_ERROR(major))
574 } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.length == 0);
576 if (mech_type != NULL) {
577 if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
578 duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
580 if (innerOutputToken.value != NULL) {
581 tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
582 sm->outputTokenType, output_token);
583 if (GSS_ERROR(tmpMajor)) {
589 if (ret_flags != NULL)
590 *ret_flags = ctx->gssFlags;
591 if (delegated_cred_handle != NULL)
592 *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
594 if (major == GSS_S_COMPLETE) {
595 if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
596 major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
597 if (GSS_ERROR(major))
600 if (time_rec != NULL)
601 gssEapContextTime(&tmpMinor, ctx, time_rec);
604 assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
607 if (cred != GSS_C_NO_CREDENTIAL)
608 GSSEAP_MUTEX_UNLOCK(&cred->mutex);
609 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
611 if (GSS_ERROR(major))
612 gssEapReleaseContext(&tmpMinor, context_handle);
614 gss_release_buffer(&tmpMinor, &innerOutputToken);
619 #ifdef GSSEAP_ENABLE_REAUTH
621 acceptReadyKrb(OM_uint32 *minor,
624 const gss_name_t initiator,
630 major = gssEapGlueToMechName(minor, initiator, &ctx->initiatorName);
631 if (GSS_ERROR(major))
634 if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
635 major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
636 if (GSS_ERROR(major))
640 major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
641 if (GSS_ERROR(major))
644 ctx->state = EAP_STATE_ESTABLISHED;
646 return GSS_S_COMPLETE;
650 eapGssSmAcceptGssReauth(OM_uint32 *minor,
653 gss_buffer_t inputToken,
654 gss_channel_bindings_t chanBindings,
655 gss_buffer_t outputToken)
657 OM_uint32 major, tmpMinor;
658 gss_cred_id_t krbCred = GSS_C_NO_CREDENTIAL;
659 gss_name_t krbInitiator = GSS_C_NO_NAME;
660 gss_OID mech = GSS_C_NO_OID;
661 OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
663 ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
665 if (cred != GSS_C_NO_CREDENTIAL)
666 krbCred = cred->krbCred;
668 major = gssAcceptSecContext(minor,
679 if (major == GSS_S_COMPLETE) {
680 major = acceptReadyKrb(minor, ctx, cred,
681 krbInitiator, mech, timeRec);
684 ctx->gssFlags = gssFlags;
686 gssReleaseName(&tmpMinor, &krbInitiator);
690 #endif /* GSSEAP_ENABLE_REAUTH */