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33 #include "gssapiP_eap.h"
36 * Mark a context as ready for cryptographic operations
39 acceptReady(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
41 OM_uint32 major, tmpMinor;
43 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
45 /* Cache encryption type derived from selected mechanism OID */
46 major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
47 &ctx->encryptionType);
51 gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
53 vp = rc_avpair_get(ctx->acceptorCtx.avps, PW_USER_NAME, 0);
55 nameBuf.length = vp->lvalue;
56 nameBuf.value = vp->strvalue;
58 ctx->gssFlags |= GSS_C_ANON_FLAG;
61 major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
66 ctx->initiatorName->attrCtx = gssEapCreateAttrContext(cred, ctx);
68 vp = rc_avpair_get(ctx->acceptorCtx.avps,
69 VENDOR_ATTR_MS_MPPE_SEND_KEY,
71 if (ctx->encryptionType != ENCTYPE_NULL && vp != NULL) {
72 major = gssEapDeriveRfc3961Key(minor,
73 (unsigned char *)vp->strvalue,
80 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
86 * draft-howlett-eap-gss says that integrity/confidentialty should
87 * always be advertised as available, but if we have no keying
88 * material it seems confusing to the caller to advertise this.
90 ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
91 ctx->encryptionType = ENCTYPE_NULL;
94 major = sequenceInit(minor,
95 &ctx->seqState, ctx->recvSeq,
96 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
97 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
102 return GSS_S_COMPLETE;
106 eapGssSmAcceptIdentity(OM_uint32 *minor,
109 gss_buffer_t inputToken,
110 gss_channel_bindings_t chanBindings,
111 gss_buffer_t outputToken)
116 unsigned char data[5];
118 gss_buffer_desc pktBuffer;
120 if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0)
121 return GSS_S_DEFECTIVE_TOKEN;
123 assert(ctx->acceptorCtx.radHandle == NULL);
125 major = gssEapRadiusAllocHandle(minor, cred, &ctx->acceptorCtx.radHandle);
126 if (GSS_ERROR(major))
129 assert(ctx->acceptorName == GSS_C_NO_NAME);
131 if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
132 major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
133 if (GSS_ERROR(major))
137 pkt.pdu.code = EAP_CODE_REQUEST;
138 pkt.pdu.identifier = 0;
139 pkt.pdu.length = htons(sizeof(pkt.data));
140 pkt.data[4] = EAP_TYPE_IDENTITY;
142 pktBuffer.length = sizeof(pkt.data);
143 pktBuffer.value = pkt.data;
145 major = duplicateBuffer(minor, &pktBuffer, outputToken);
146 if (GSS_ERROR(major))
149 ctx->state = EAP_STATE_AUTHENTICATE;
151 return GSS_S_CONTINUE_NEEDED;
155 setAcceptorIdentity(OM_uint32 *minor,
160 gss_buffer_desc nameBuf;
161 krb5_context krbContext = NULL;
162 krb5_principal krbPrinc;
164 /* Awaits further specification */
165 if (ctx->acceptorName == GSS_C_NO_NAME)
166 return GSS_S_COMPLETE;
168 GSSEAP_KRB_INIT(&krbContext);
170 krbPrinc = ctx->acceptorName->krbPrincipal;
171 assert(krbPrinc != NULL);
173 if (krb5_princ_size(krbContext, krbPrinc) < 2)
174 return GSS_S_BAD_NAME;
176 /* Acceptor-Service-Name */
177 krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 0), &nameBuf);
179 major = addAvpFromBuffer(minor, ctx->acceptorCtx.radHandle, avps,
180 VENDOR_ATTR_GSS_ACCEPTOR_SERVICE_NAME,
183 if (GSS_ERROR(major))
186 /* Acceptor-Host-Name */
187 krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 1), &nameBuf);
189 major = addAvpFromBuffer(minor, ctx->acceptorCtx.radHandle, avps,
190 VENDOR_ATTR_GSS_ACCEPTOR_HOST_NAME,
193 if (GSS_ERROR(major))
196 if (krb5_princ_size(krbContext, krbPrinc) > 2) {
197 /* Acceptor-Service-Specific */
198 krb5_principal_data ssiPrinc = *krbPrinc;
201 krb5_princ_size(krbContext, &ssiPrinc) -= 2;
202 krb5_princ_name(krbContext, &ssiPrinc) += 2;
204 *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
205 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
207 return GSS_S_FAILURE;
210 nameBuf.length = strlen(ssi);
212 major = addAvpFromBuffer(minor, ctx->acceptorCtx.radHandle, avps,
213 VENDOR_ATTR_GSS_ACCEPTOR_SERVICE_SPECIFIC,
217 if (GSS_ERROR(major)) {
218 krb5_free_unparsed_name(krbContext, ssi);
221 krb5_free_unparsed_name(krbContext, ssi);
224 krbDataToGssBuffer(krb5_princ_realm(krbContext, krbPrinc), &nameBuf);
225 if (nameBuf.length != 0) {
226 /* Acceptor-Realm-Name */
227 major = addAvpFromBuffer(minor, ctx->acceptorCtx.radHandle, avps,
228 VENDOR_ATTR_GSS_ACCEPTOR_REALM_NAME,
231 if (GSS_ERROR(major))
235 return GSS_S_COMPLETE;
239 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
242 gss_buffer_t inputToken,
243 gss_channel_bindings_t chanBindings,
244 gss_buffer_t outputToken)
246 OM_uint32 major, tmpMinor;
248 VALUE_PAIR *send = NULL;
249 VALUE_PAIR *received = NULL;
250 rc_handle *rh = ctx->acceptorCtx.radHandle;
251 char msgBuffer[4096];
254 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
256 pdu = (struct eap_hdr *)inputToken->value;
257 pos = (unsigned char *)(pdu + 1);
259 if (inputToken->length > sizeof(*pdu) &&
260 pdu->code == EAP_CODE_RESPONSE &&
261 pos[0] == EAP_TYPE_IDENTITY) {
263 * XXX TODO do we really need to set User-Name? FreeRADIUS does
264 * not appear to require it.
266 major = addAvpFromBuffer(minor, rh, &send, PW_USER_NAME, 0, &nameBuf);
267 if (GSS_ERROR(major))
270 major = setAcceptorIdentity(minor, ctx, &send);
271 if (GSS_ERROR(major))
275 major = addAvpFromBuffer(minor, rh, &send, PW_EAP_MESSAGE, 0, inputToken);
276 if (GSS_ERROR(major))
279 if (ctx->acceptorCtx.lastStatus == CHALLENGE_RC) {
280 major = addAvpFromBuffer(minor, rh, &send, PW_STATE, 0,
281 &ctx->acceptorCtx.state);
282 if (GSS_ERROR(major))
285 gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
288 code = rc_auth(rh, 0, send, &received, msgBuffer);
292 major = GSS_S_CONTINUE_NEEDED;
295 major = GSS_S_UNAVAILABLE;
298 major = GSS_S_DEFECTIVE_CREDENTIAL;
301 major = GSS_S_FAILURE;
305 if (GSS_ERROR(major))
308 ctx->acceptorCtx.lastStatus = code;
310 major = getBufferFromAvps(minor, received, PW_EAP_MESSAGE, 0,
312 if ((major == GSS_S_UNAVAILABLE && code != OK_RC) ||
316 if (code == CHALLENGE_RC) {
317 major = getBufferFromAvps(minor, received, PW_STATE, 0,
318 &ctx->acceptorCtx.state, TRUE);
319 if (major != GSS_S_UNAVAILABLE && GSS_ERROR(major))
322 ctx->acceptorCtx.avps = received;
325 major = acceptReady(minor, ctx, cred);
326 if (GSS_ERROR(major))
329 ctx->state = EAP_STATE_GSS_CHANNEL_BINDINGS;
332 major = GSS_S_CONTINUE_NEEDED;
335 if (received != NULL)
336 rc_avpair_free(received);
342 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
345 gss_buffer_t inputToken,
346 gss_channel_bindings_t chanBindings,
347 gss_buffer_t outputToken)
350 gss_iov_buffer_desc iov[2];
352 outputToken->length = 0;
353 outputToken->value = NULL;
355 if (chanBindings == GSS_C_NO_CHANNEL_BINDINGS) {
356 ctx->state = EAP_STATE_ESTABLISHED;
357 return GSS_S_COMPLETE;
360 if (inputToken->length < 14) {
361 return GSS_S_DEFECTIVE_TOKEN;
364 iov[0].type = GSS_IOV_BUFFER_TYPE_DATA;
365 iov[0].buffer.length = 0;
366 iov[0].buffer.value = NULL;
368 if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
369 iov[0].buffer = chanBindings->application_data;
371 iov[1].type = GSS_IOV_BUFFER_TYPE_HEADER;
372 iov[1].buffer.length = 16;
373 iov[1].buffer.value = (unsigned char *)inputToken->value - 2;
375 assert(load_uint16_be(iov[1].buffer.value) == TOK_TYPE_GSS_CB);
377 iov[2].type = GSS_IOV_BUFFER_TYPE_TRAILER;
378 iov[2].buffer.length = inputToken->length - 14;
379 iov[2].buffer.value = (unsigned char *)inputToken->value + 14;
381 major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
382 iov, 3, TOK_TYPE_GSS_CB);
383 if (major == GSS_S_COMPLETE) {
384 ctx->state = EAP_STATE_ESTABLISHED;
388 gss_release_buffer(&tmpMinor, &iov[0].buffer);
395 eapGssSmAcceptKrbCred(OM_uint32 *minor,
398 gss_buffer_t inputToken,
399 gss_channel_bindings_t chanBindings,
400 gss_buffer_t outputToken)
402 /* Called with already established context */
404 return GSS_S_BAD_STATUS;
408 eapGssSmAcceptEstablished(OM_uint32 *minor,
411 gss_buffer_t inputToken,
412 gss_channel_bindings_t chanBindings,
413 gss_buffer_t outputToken)
415 /* Called with already established context */
417 return GSS_S_BAD_STATUS;
420 static struct gss_eap_acceptor_sm {
421 enum gss_eap_token_type inputTokenType;
422 enum gss_eap_token_type outputTokenType;
423 OM_uint32 (*processToken)(OM_uint32 *,
427 gss_channel_bindings_t,
429 } eapGssAcceptorSm[] = {
430 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptIdentity },
431 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptAuthenticate },
432 { TOK_TYPE_GSS_CB, TOK_TYPE_NONE, eapGssSmAcceptGssChannelBindings },
433 { TOK_TYPE_NONE, TOK_TYPE_KRB_CRED, eapGssSmAcceptKrbCred },
434 { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmAcceptEstablished },
438 gss_accept_sec_context(OM_uint32 *minor,
439 gss_ctx_id_t *context_handle,
441 gss_buffer_t input_token,
442 gss_channel_bindings_t input_chan_bindings,
443 gss_name_t *src_name,
445 gss_buffer_t output_token,
446 OM_uint32 *ret_flags,
448 gss_cred_id_t *delegated_cred_handle)
451 OM_uint32 tmpMajor, tmpMinor;
452 gss_ctx_id_t ctx = *context_handle;
453 struct gss_eap_acceptor_sm *sm = NULL;
454 gss_buffer_desc innerInputToken = GSS_C_EMPTY_BUFFER;
455 gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
459 output_token->length = 0;
460 output_token->value = NULL;
462 if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_ACCEPT)) {
463 return GSS_S_NO_CRED;
466 if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
467 return GSS_S_DEFECTIVE_TOKEN;
470 if (ctx == GSS_C_NO_CONTEXT) {
471 major = gssEapAllocContext(minor, &ctx);
472 if (GSS_ERROR(major))
475 *context_handle = ctx;
478 GSSEAP_MUTEX_LOCK(&ctx->mutex);
480 sm = &eapGssAcceptorSm[ctx->state];
482 major = gssEapVerifyToken(minor, ctx, input_token,
483 sm->inputTokenType, &innerInputToken);
484 if (GSS_ERROR(major))
487 /* If credentials were provided, check they're usable with this mech */
488 if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
489 major = GSS_S_BAD_MECH;
494 sm = &eapGssAcceptorSm[ctx->state];
496 major = (sm->processToken)(minor,
502 if (GSS_ERROR(major))
504 } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.length == 0);
506 if (mech_type != NULL) {
507 if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
508 duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
510 if (innerOutputToken.length != 0) {
511 tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
512 sm->outputTokenType, output_token);
513 if (GSS_ERROR(tmpMajor)) {
519 if (ret_flags != NULL)
520 *ret_flags = ctx->gssFlags;
521 if (delegated_cred_handle != NULL)
522 *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
524 if (major == GSS_S_COMPLETE) {
525 if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
526 major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
527 if (GSS_ERROR(major))
530 if (time_rec != NULL)
531 gssEapContextTime(&tmpMinor, ctx, time_rec);
534 assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
537 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
539 if (GSS_ERROR(major))
540 gssEapReleaseContext(&tmpMinor, context_handle);
542 gss_release_buffer(&tmpMinor, &innerOutputToken);