2 * Copyright (c) 2010, JANET(UK)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of JANET(UK) nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include "gssapiP_eap.h"
36 policyVariableToFlag(enum eapol_bool_var variable)
41 case EAPOL_eapSuccess:
42 flag = CTX_FLAG_EAP_SUCCESS;
44 case EAPOL_eapRestart:
45 flag = CTX_FLAG_EAP_RESTART;
48 flag = CTX_FLAG_EAP_FAIL;
51 flag = CTX_FLAG_EAP_RESP;
54 flag = CTX_FLAG_EAP_NO_RESP;
57 flag = CTX_FLAG_EAP_REQ;
59 case EAPOL_portEnabled:
60 flag = CTX_FLAG_EAP_PORT_ENABLED;
63 flag = CTX_FLAG_EAP_ALT_ACCEPT;
66 flag = CTX_FLAG_EAP_ALT_REJECT;
73 static struct eap_peer_config *
74 peerGetConfig(void *ctx)
76 gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
78 return &gssCtx->initiatorCtx.eapPeerConfig;
82 peerGetBool(void *data, enum eapol_bool_var variable)
84 gss_ctx_id_t ctx = data;
87 if (ctx == GSS_C_NO_CONTEXT)
90 flag = policyVariableToFlag(variable);
92 return ((ctx->flags & flag) != 0);
96 peerSetBool(void *data, enum eapol_bool_var variable,
99 gss_ctx_id_t ctx = data;
102 if (ctx == GSS_C_NO_CONTEXT)
105 flag = policyVariableToFlag(variable);
110 ctx->flags &= ~(flag);
114 peerGetInt(void *data, enum eapol_int_var variable)
116 gss_ctx_id_t ctx = data;
118 if (ctx == GSS_C_NO_CONTEXT)
121 assert(CTX_IS_INITIATOR(ctx));
124 case EAPOL_idleWhile:
125 return ctx->initiatorCtx.idleWhile;
133 peerSetInt(void *data, enum eapol_int_var variable,
136 gss_ctx_id_t ctx = data;
138 if (ctx == GSS_C_NO_CONTEXT)
141 assert(CTX_IS_INITIATOR(ctx));
144 case EAPOL_idleWhile:
145 ctx->initiatorCtx.idleWhile = value;
150 static struct wpabuf *
151 peerGetEapReqData(void *ctx)
153 gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
155 return &gssCtx->initiatorCtx.reqData;
159 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
163 static const struct wpa_config_blob *
164 peerGetConfigBlob(void *ctx, const char *name)
170 peerNotifyPending(void *ctx)
174 static struct eapol_callbacks gssEapPolicyCallbacks = {
186 extern int wpa_debug_level;
189 peerConfigInit(OM_uint32 *minor,
193 krb5_context krbContext;
194 struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
195 krb5_error_code code;
198 GSSEAP_KRB_INIT(&krbContext);
200 eapPeerConfig->fragment_size = 1024;
203 code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
206 return GSS_S_FAILURE;
209 eapPeerConfig->identity = (unsigned char *)identity;
210 eapPeerConfig->identity_len = strlen(identity);
211 eapPeerConfig->password = (unsigned char *)cred->password.value;
212 eapPeerConfig->password_len = cred->password.length;
214 return GSS_S_COMPLETE;
218 peerConfigFree(OM_uint32 *minor,
221 krb5_context krbContext;
222 struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
224 GSSEAP_KRB_INIT(&krbContext);
226 krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
228 return GSS_S_COMPLETE;
232 initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
235 const unsigned char *key;
238 /* Cache encryption type derived from selected mechanism OID */
239 major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
240 if (GSS_ERROR(major))
243 if (ctx->encryptionType != ENCTYPE_NULL &&
244 eap_key_available(ctx->initiatorCtx.eap)) {
245 key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
247 major = gssEapDeriveRfc3961Key(minor, key, keyLength,
248 ctx->encryptionType, &ctx->rfc3961Key);
249 if (GSS_ERROR(major))
252 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
254 if (GSS_ERROR(major))
258 * draft-howlett-eap-gss says that integrity/confidentialty should
259 * always be advertised as available, but if we have no keying
260 * material it seems confusing to the caller to advertise this.
262 ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
263 ctx->encryptionType = ENCTYPE_NULL;
266 major = sequenceInit(minor,
269 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
270 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
272 if (GSS_ERROR(major))
275 return GSS_S_COMPLETE;
279 eapGssSmInitIdentity(OM_uint32 *minor,
286 gss_channel_bindings_t chanBindings,
287 gss_buffer_t inputToken,
288 gss_buffer_t outputToken)
292 int initialContextToken;
294 initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
295 inputToken->length == 0);
296 if (!initialContextToken)
297 return GSS_S_DEFECTIVE_TOKEN;
300 if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
303 ctx->expiryTime = now + timeReq;
305 major = gss_duplicate_name(minor, cred->name, &ctx->initiatorName);
306 if (GSS_ERROR(major))
309 major = gss_duplicate_name(minor, target, &ctx->acceptorName);
310 if (GSS_ERROR(major))
313 if (mech == GSS_C_NULL_OID || oidEqual(mech, GSS_EAP_MECHANISM)) {
314 major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
315 } else if (gssEapIsConcreteMechanismOid(mech)) {
316 if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
317 major = duplicateOid(minor, mech, &ctx->mechanismUsed);
319 major = GSS_S_BAD_MECH;
321 if (GSS_ERROR(major))
324 /* If credentials were provided, check they're usable with this mech */
325 if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
326 return GSS_S_BAD_MECH;
328 ctx->state = EAP_STATE_AUTHENTICATE;
330 return GSS_S_CONTINUE_NEEDED;
333 static struct wpabuf emptyWpaBuffer;
336 eapGssSmInitAuthenticate(OM_uint32 *minor,
343 gss_channel_bindings_t chanBindings,
344 gss_buffer_t inputToken,
345 gss_buffer_t outputToken)
350 struct wpabuf *resp = NULL;
351 int initialContextToken;
353 initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
354 inputToken->length == 0);
356 major = peerConfigInit(minor, cred, ctx);
357 if (GSS_ERROR(major))
360 if (ctx->initiatorCtx.eap == NULL) {
361 struct eap_config eapConfig;
363 memset(&eapConfig, 0, sizeof(eapConfig));
365 ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
366 &gssEapPolicyCallbacks,
369 if (ctx->initiatorCtx.eap == NULL) {
370 major = GSS_S_FAILURE;
374 ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
377 ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
379 wpabuf_set(&ctx->initiatorCtx.reqData,
380 inputToken->value, inputToken->length);
382 major = GSS_S_CONTINUE_NEEDED;
384 code = eap_peer_sm_step(ctx->initiatorCtx.eap);
385 if (ctx->flags & CTX_FLAG_EAP_RESP) {
386 ctx->flags &= ~(CTX_FLAG_EAP_RESP);
388 resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
389 } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
390 major = initReady(minor, ctx);
391 if (GSS_ERROR(major))
394 ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
395 major = GSS_S_CONTINUE_NEEDED;
396 ctx->state = EAP_STATE_GSS_CHANNEL_BINDINGS;
397 } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
398 major = GSS_S_DEFECTIVE_CREDENTIAL;
399 } else if (code == 0 && initialContextToken) {
400 resp = &emptyWpaBuffer;
401 major = GSS_S_CONTINUE_NEEDED;
403 major = GSS_S_DEFECTIVE_TOKEN;
409 gss_buffer_desc respBuf;
411 assert(major == GSS_S_CONTINUE_NEEDED);
413 respBuf.length = wpabuf_len(resp);
414 respBuf.value = (void *)wpabuf_head(resp);
416 tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
417 if (GSS_ERROR(tmpMajor)) {
423 wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
424 peerConfigFree(&tmpMinor, ctx);
430 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
437 gss_channel_bindings_t chanBindings,
438 gss_buffer_t inputToken,
439 gss_buffer_t outputToken)
442 gss_iov_buffer_desc iov[2];
445 iov[0].type = GSS_IOV_BUFFER_TYPE_DATA;
446 iov[0].buffer.length = 0;
447 iov[0].buffer.value = NULL;
449 iov[1].type = GSS_IOV_BUFFER_TYPE_HEADER | GSS_IOV_BUFFER_FLAG_ALLOCATE;
450 iov[1].buffer.length = 0;
451 iov[1].buffer.value = NULL;
453 if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
454 iov[0].buffer = chanBindings->application_data;
456 major = gssEapWrapOrGetMIC(minor, ctx, FALSE, FALSE, iov, 2,
458 if (GSS_ERROR(major))
461 /* Skip past token ID */
462 assert(iov[1].buffer.length > 2);
463 assert(load_uint16_be(iov[1].buffer.value) == TOK_TYPE_GSS_CB);
465 buf.length = iov[1].buffer.length - 2;
466 buf.value = (unsigned char *)iov[1].buffer.value + 2;
468 major = duplicateBuffer(minor, &buf, outputToken);
469 if (GSS_ERROR(major))
472 major = GSS_S_COMPLETE;
473 ctx->state = EAP_STATE_ESTABLISHED;
476 gssEapReleaseIov(iov, 2);
482 eapGssSmInitEstablished(OM_uint32 *minor,
489 gss_channel_bindings_t chanBindings,
490 gss_buffer_t inputToken,
491 gss_buffer_t outputToken)
493 /* Called with already established context */
495 return GSS_S_BAD_STATUS;
498 static struct gss_eap_initiator_sm {
499 enum gss_eap_token_type inputTokenType;
500 enum gss_eap_token_type outputTokenType;
501 OM_uint32 (*processToken)(OM_uint32 *,
508 gss_channel_bindings_t,
511 } eapGssInitiatorSm[] = {
512 { TOK_TYPE_NONE, TOK_TYPE_EAP_RESP, eapGssSmInitIdentity },
513 { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP, eapGssSmInitAuthenticate },
514 { TOK_TYPE_NONE, TOK_TYPE_GSS_CB, eapGssSmInitGssChannelBindings },
515 { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmInitEstablished },
519 gss_init_sec_context(OM_uint32 *minor,
521 gss_ctx_id_t *context_handle,
522 gss_name_t target_name,
526 gss_channel_bindings_t input_chan_bindings,
527 gss_buffer_t input_token,
528 gss_OID *actual_mech_type,
529 gss_buffer_t output_token,
530 OM_uint32 *ret_flags,
534 OM_uint32 tmpMajor, tmpMinor;
535 gss_ctx_id_t ctx = *context_handle;
536 struct gss_eap_initiator_sm *sm = NULL;
537 gss_buffer_desc innerInputToken;
538 gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
542 output_token->length = 0;
543 output_token->value = NULL;
545 if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_INITIATE)) {
546 return GSS_S_NO_CRED;
549 if (ctx == GSS_C_NO_CONTEXT) {
550 if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
551 return GSS_S_DEFECTIVE_TOKEN;
554 major = gssEapAllocContext(minor, &ctx);
555 if (GSS_ERROR(major))
558 ctx->flags |= CTX_FLAG_INITIATOR;
560 *context_handle = ctx;
563 GSSEAP_MUTEX_LOCK(&ctx->mutex);
565 sm = &eapGssInitiatorSm[ctx->state];
567 if (input_token != GSS_C_NO_BUFFER) {
568 major = gssEapVerifyToken(minor, ctx, input_token,
569 sm->inputTokenType, &innerInputToken);
570 if (GSS_ERROR(major))
573 innerInputToken.length = 0;
574 innerInputToken.value = NULL;
578 * Advance through state machine whilst empty tokens are emitted and
579 * the status is not GSS_S_COMPLETE or an error status.
582 sm = &eapGssInitiatorSm[ctx->state];
584 major = (sm->processToken)(minor,
594 if (GSS_ERROR(major))
596 } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
598 if (actual_mech_type != NULL) {
599 if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
600 duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
602 if (innerOutputToken.value != NULL) {
603 tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
604 sm->outputTokenType, output_token);
605 if (GSS_ERROR(tmpMajor)) {
611 if (ret_flags != NULL)
612 *ret_flags = ctx->gssFlags;
613 if (time_rec != NULL)
614 gss_context_time(&tmpMinor, ctx, time_rec);
616 assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
619 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
621 if (GSS_ERROR(major))
622 gssEapReleaseContext(&tmpMinor, context_handle);
624 gss_release_buffer(&tmpMinor, &innerOutputToken);