2 * Copyright (c) 2011, JANET(UK)
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Establish a security context on the initiator (client). These functions
38 #include "gssapiP_eap.h"
41 policyVariableToFlag(enum eapol_bool_var variable)
46 case EAPOL_eapSuccess:
47 flag = CTX_FLAG_EAP_SUCCESS;
49 case EAPOL_eapRestart:
50 flag = CTX_FLAG_EAP_RESTART;
53 flag = CTX_FLAG_EAP_FAIL;
56 flag = CTX_FLAG_EAP_RESP;
59 flag = CTX_FLAG_EAP_NO_RESP;
62 flag = CTX_FLAG_EAP_REQ;
64 case EAPOL_portEnabled:
65 flag = CTX_FLAG_EAP_PORT_ENABLED;
68 flag = CTX_FLAG_EAP_ALT_ACCEPT;
71 flag = CTX_FLAG_EAP_ALT_REJECT;
78 static struct eap_peer_config *
79 peerGetConfig(void *ctx)
81 gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
83 return &gssCtx->initiatorCtx.eapPeerConfig;
87 peerGetBool(void *data, enum eapol_bool_var variable)
89 gss_ctx_id_t ctx = data;
92 if (ctx == GSS_C_NO_CONTEXT)
95 flag = policyVariableToFlag(variable);
97 return ((ctx->flags & flag) != 0);
101 peerSetBool(void *data, enum eapol_bool_var variable,
104 gss_ctx_id_t ctx = data;
107 if (ctx == GSS_C_NO_CONTEXT)
110 flag = policyVariableToFlag(variable);
115 ctx->flags &= ~(flag);
119 peerGetInt(void *data, enum eapol_int_var variable)
121 gss_ctx_id_t ctx = data;
123 if (ctx == GSS_C_NO_CONTEXT)
126 assert(CTX_IS_INITIATOR(ctx));
129 case EAPOL_idleWhile:
130 return ctx->initiatorCtx.idleWhile;
138 peerSetInt(void *data, enum eapol_int_var variable,
141 gss_ctx_id_t ctx = data;
143 if (ctx == GSS_C_NO_CONTEXT)
146 assert(CTX_IS_INITIATOR(ctx));
149 case EAPOL_idleWhile:
150 ctx->initiatorCtx.idleWhile = value;
155 static struct wpabuf *
156 peerGetEapReqData(void *ctx)
158 gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
160 return &gssCtx->initiatorCtx.reqData;
164 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
168 static const struct wpa_config_blob *
169 peerGetConfigBlob(void *ctx, const char *name)
175 peerNotifyPending(void *ctx)
179 static struct eapol_callbacks gssEapPolicyCallbacks = {
192 extern int wpa_debug_level;
196 peerConfigInit(OM_uint32 *minor,
200 krb5_context krbContext;
201 struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
202 krb5_error_code code;
203 char *identity, *anonymousIdentity;
205 eapPeerConfig->identity = NULL;
206 eapPeerConfig->identity_len = 0;
207 eapPeerConfig->password = NULL;
208 eapPeerConfig->password_len = 0;
210 assert(cred != GSS_C_NO_CREDENTIAL);
212 GSSEAP_KRB_INIT(&krbContext);
214 eapPeerConfig->fragment_size = 1024;
219 assert(cred->name != GSS_C_NO_NAME);
221 if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
222 *minor = GSSEAP_BAD_INITIATOR_NAME;
223 return GSS_S_BAD_NAME;
226 code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
229 return GSS_S_FAILURE;
232 anonymousIdentity = strchr(identity, '@');
233 if (anonymousIdentity == NULL)
234 anonymousIdentity = "";
236 eapPeerConfig->identity = (unsigned char *)identity;
237 eapPeerConfig->identity_len = strlen(identity);
238 eapPeerConfig->anonymous_identity = (unsigned char *)anonymousIdentity;
239 eapPeerConfig->anonymous_identity_len = strlen(anonymousIdentity);
240 eapPeerConfig->password = (unsigned char *)cred->password.value;
241 eapPeerConfig->password_len = cred->password.length;
244 return GSS_S_COMPLETE;
248 peerConfigFree(OM_uint32 *minor,
251 krb5_context krbContext;
252 struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
254 GSSEAP_KRB_INIT(&krbContext);
256 krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
259 return GSS_S_COMPLETE;
263 * Mark an initiator context as ready for cryptographic operations
266 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
269 const unsigned char *key;
273 /* XXX actually check for mutual auth */
274 if (reqFlags & GSS_C_MUTUAL_FLAG)
275 ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
278 /* Cache encryption type derived from selected mechanism OID */
279 major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
280 if (GSS_ERROR(major))
283 if (!eap_key_available(ctx->initiatorCtx.eap)) {
284 *minor = GSSEAP_KEY_UNAVAILABLE;
285 return GSS_S_UNAVAILABLE;
288 key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
290 if (keyLength < EAP_EMSK_LEN) {
291 *minor = GSSEAP_KEY_TOO_SHORT;
292 return GSS_S_UNAVAILABLE;
295 major = gssEapDeriveRfc3961Key(minor,
296 &key[EAP_EMSK_LEN / 2],
300 if (GSS_ERROR(major))
303 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
305 if (GSS_ERROR(major))
308 major = sequenceInit(minor,
311 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
312 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
314 if (GSS_ERROR(major))
318 return GSS_S_COMPLETE;
322 initBegin(OM_uint32 *minor,
329 gss_channel_bindings_t chanBindings,
330 gss_buffer_t inputToken)
334 assert(cred != GSS_C_NO_CREDENTIAL);
336 if (cred->expiryTime)
337 ctx->expiryTime = cred->expiryTime;
338 else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
341 ctx->expiryTime = time(NULL) + timeReq;
344 * The credential mutex protects its name, however we need to
345 * explicitly lock the acceptor name (unlikely as it may be
346 * that it has attributes set on it).
348 major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
349 if (GSS_ERROR(major))
352 GSSEAP_MUTEX_LOCK(&target->mutex);
354 major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
355 if (GSS_ERROR(major)) {
356 GSSEAP_MUTEX_UNLOCK(&target->mutex);
360 GSSEAP_MUTEX_UNLOCK(&target->mutex);
362 if (mech == GSS_C_NULL_OID) {
363 major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
364 } else if (gssEapIsConcreteMechanismOid(mech)) {
365 if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
366 major = duplicateOid(minor, mech, &ctx->mechanismUsed);
368 major = GSS_S_BAD_MECH;
369 *minor = GSSEAP_WRONG_MECH;
371 if (GSS_ERROR(major))
374 /* If credentials were provided, check they're usable with this mech */
375 if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
376 *minor = GSSEAP_CRED_MECH_MISMATCH;
377 return GSS_S_BAD_MECH;
381 return GSS_S_COMPLETE;
385 eapGssSmInitError(OM_uint32 *minor,
392 gss_channel_bindings_t chanBindings,
393 gss_buffer_t inputToken,
394 gss_buffer_t outputToken)
399 if (inputToken->length < 8) {
400 *minor = GSSEAP_TOK_TRUNC;
401 return GSS_S_DEFECTIVE_TOKEN;
404 p = (unsigned char *)inputToken->value;
406 major = load_uint32_be(&p[0]);
407 *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
409 if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
410 major = GSS_S_FAILURE;
411 *minor = GSSEAP_BAD_ERROR_TOKEN;
414 assert(GSS_ERROR(major));
419 #ifdef GSSEAP_ENABLE_REAUTH
421 eapGssSmInitGssReauth(OM_uint32 *minor,
428 gss_channel_bindings_t chanBindings,
429 gss_buffer_t inputToken,
430 gss_buffer_t outputToken)
432 OM_uint32 major, tmpMinor;
433 gss_name_t mechTarget = GSS_C_NO_NAME;
434 gss_OID actualMech = GSS_C_NO_OID;
435 OM_uint32 gssFlags, timeRec;
437 assert(cred != GSS_C_NO_CREDENTIAL);
439 if (ctx->state == GSSEAP_STATE_INITIAL) {
440 if (!gssEapCanReauthP(cred, target, timeReq))
441 return GSS_S_CONTINUE_NEEDED;
443 major = initBegin(minor, cred, ctx, target, mech,
444 reqFlags, timeReq, chanBindings,
446 if (GSS_ERROR(major))
449 ctx->flags |= CTX_FLAG_KRB_REAUTH;
450 } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
451 major = GSS_S_DEFECTIVE_TOKEN;
452 *minor = GSSEAP_WRONG_ITOK;
456 major = gssEapMechToGlueName(minor, target, &mechTarget);
457 if (GSS_ERROR(major))
460 major = gssInitSecContext(minor,
464 (gss_OID)gss_mech_krb5,
473 if (GSS_ERROR(major))
476 ctx->gssFlags = gssFlags;
478 if (major == GSS_S_COMPLETE) {
479 major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
480 if (GSS_ERROR(major))
482 ctx->state = GSSEAP_STATE_NEGO_EXT; /* skip */
484 major = GSS_S_COMPLETE; /* advance state */
488 gssReleaseName(&tmpMinor, &mechTarget);
492 #endif /* GSSEAP_ENABLE_REAUTH */
495 eapGssSmInitIdentity(OM_uint32 *minor,
502 gss_channel_bindings_t chanBindings,
503 gss_buffer_t inputToken,
504 gss_buffer_t outputToken)
507 int initialContextToken;
509 assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
511 initialContextToken = (inputToken->length == 0);
512 if (!initialContextToken) {
513 *minor = GSSEAP_WRONG_SIZE;
514 return GSS_S_DEFECTIVE_TOKEN;
517 major = initBegin(minor, cred, ctx, target, mech,
518 reqFlags, timeReq, chanBindings,
520 if (GSS_ERROR(major))
523 outputToken->length = 0;
524 outputToken->value = NULL;
527 return GSS_S_COMPLETE; /* advance state */
530 static struct wpabuf emptyWpaBuffer;
533 eapGssSmInitAuthenticate(OM_uint32 *minor,
540 gss_channel_bindings_t chanBindings,
541 gss_buffer_t inputToken,
542 gss_buffer_t outputToken)
547 struct wpabuf *resp = NULL;
548 int initialContextToken;
552 initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
553 inputToken->length == 0);
555 major = peerConfigInit(minor, cred, ctx);
556 if (GSS_ERROR(major))
559 if (ctx->initiatorCtx.eap == NULL) {
560 struct eap_config eapConfig;
562 memset(&eapConfig, 0, sizeof(eapConfig));
564 ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
565 &gssEapPolicyCallbacks,
568 if (ctx->initiatorCtx.eap == NULL) {
569 major = GSS_S_FAILURE;
570 *minor = GSSEAP_PEER_SM_INIT_FAILURE;
574 ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
577 ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
579 wpabuf_set(&ctx->initiatorCtx.reqData,
580 inputToken->value, inputToken->length);
582 code = eap_peer_sm_step(ctx->initiatorCtx.eap);
583 if (ctx->flags & CTX_FLAG_EAP_RESP) {
584 ctx->flags &= ~(CTX_FLAG_EAP_RESP);
586 resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
587 major = GSS_S_CONTINUE_NEEDED;
588 } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
589 major = initReady(minor, ctx, reqFlags);
590 if (GSS_ERROR(major))
593 ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
594 major = GSS_S_COMPLETE; /* advance state */
595 } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
596 major = GSS_S_DEFECTIVE_CREDENTIAL;
597 *minor = GSSEAP_PEER_AUTH_FAILURE;
598 } else if (code == 0 && initialContextToken) {
599 major = GSS_S_CONTINUE_NEEDED;
601 major = GSS_S_DEFECTIVE_TOKEN;
602 *minor = GSSEAP_PEER_BAD_MESSAGE;
608 gss_buffer_desc respBuf;
610 assert(!GSS_ERROR(major));
612 respBuf.length = wpabuf_len(resp);
613 respBuf.value = (void *)wpabuf_head(resp);
615 tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
616 if (GSS_ERROR(tmpMajor)) {
622 wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
623 peerConfigFree(&tmpMinor, ctx);
629 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
636 gss_channel_bindings_t chanBindings,
637 gss_buffer_t inputToken,
638 gss_buffer_t outputToken)
641 gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
643 if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
644 buffer = chanBindings->application_data;
646 major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
647 &buffer, NULL, outputToken);
648 if (GSS_ERROR(major))
651 assert(outputToken->value != NULL);
654 return GSS_S_CONTINUE_NEEDED;
657 #ifdef GSSEAP_ENABLE_REAUTH
659 eapGssSmInitReauthCreds(OM_uint32 *minor,
666 gss_channel_bindings_t chanBindings,
667 gss_buffer_t inputToken,
668 gss_buffer_t outputToken)
672 major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
673 if (GSS_ERROR(major))
677 return GSS_S_CONTINUE_NEEDED;
679 #endif /* GSSEAP_ENABLE_REAUTH */
682 eapGssSmInitNegoExtFinished(OM_uint32 *minor,
689 gss_channel_bindings_t chanBindings,
690 gss_buffer_t inputToken,
691 gss_buffer_t outputToken)
694 return GSS_S_COMPLETE; /* advance state */
697 static struct gss_eap_sm eapGssInitiatorSm[] = {
699 ITOK_TYPE_CONTEXT_ERR,
706 #ifdef GSSEAP_ENABLE_REAUTH
708 ITOK_TYPE_REAUTH_RESP,
709 ITOK_TYPE_REAUTH_REQ,
710 GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
713 eapGssSmInitGssReauth,
716 /* first-leg extensions go here, they should return GSS_S_CONTINUE_NEEDED */
720 GSSEAP_STATE_INITIAL,
723 eapGssSmInitIdentity,
728 GSSEAP_STATE_AUTHENTICATE,
731 eapGssSmInitAuthenticate,
735 ITOK_TYPE_GSS_CHANNEL_BINDINGS,
736 GSSEAP_STATE_NEGO_EXT,
739 eapGssSmInitGssChannelBindings,
741 #ifdef GSSEAP_ENABLE_REAUTH
743 ITOK_TYPE_REAUTH_CREDS,
745 GSSEAP_STATE_NEGO_EXT,
748 eapGssSmInitReauthCreds,
751 /* other extensions go here */
755 GSSEAP_STATE_NEGO_EXT,
758 eapGssSmInitNegoExtFinished
763 gss_init_sec_context(OM_uint32 *minor,
765 gss_ctx_id_t *context_handle,
766 gss_name_t target_name,
770 gss_channel_bindings_t input_chan_bindings,
771 gss_buffer_t input_token,
772 gss_OID *actual_mech_type,
773 gss_buffer_t output_token,
774 OM_uint32 *ret_flags,
777 OM_uint32 major, tmpMinor;
778 gss_ctx_id_t ctx = *context_handle;
779 int initialContextToken = 0;
783 output_token->length = 0;
784 output_token->value = NULL;
786 if (ctx == GSS_C_NO_CONTEXT) {
787 if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
788 *minor = GSSEAP_WRONG_SIZE;
789 return GSS_S_DEFECTIVE_TOKEN;
792 major = gssEapAllocContext(minor, &ctx);
793 if (GSS_ERROR(major))
796 ctx->flags |= CTX_FLAG_INITIATOR;
798 initialContextToken = 1;
799 *context_handle = ctx;
802 GSSEAP_MUTEX_LOCK(&ctx->mutex);
804 if (cred == GSS_C_NO_CREDENTIAL) {
805 if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
806 major = gssEapAcquireCred(minor,
815 if (GSS_ERROR(major))
819 cred = ctx->defaultCred;
822 GSSEAP_MUTEX_LOCK(&cred->mutex);
825 if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
826 major = GSS_S_NO_CRED;
827 *minor = GSSEAP_CRED_USAGE_MISMATCH;
831 major = gssEapSmStep(minor,
842 sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
843 if (GSS_ERROR(major))
846 if (actual_mech_type != NULL) {
847 if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
848 duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
850 if (ret_flags != NULL)
851 *ret_flags = ctx->gssFlags;
852 if (time_rec != NULL)
853 gssEapContextTime(&tmpMinor, ctx, time_rec);
855 assert(ctx->state == GSSEAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
858 if (cred != GSS_C_NO_CREDENTIAL)
859 GSSEAP_MUTEX_UNLOCK(&cred->mutex);
860 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
862 if (GSS_ERROR(major))
863 gssEapReleaseContext(&tmpMinor, context_handle);