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"
38 * Fast reauthentication support for EAP GSS.
42 krb5_encrypt_tkt_part(krb5_context, const krb5_keyblock *, krb5_ticket *);
45 encode_krb5_ticket(const krb5_ticket *rep, krb5_data **code);
47 static krb5_error_code
48 getAcceptorKey(krb5_context krbContext,
51 krb5_principal *princ,
55 krb5_keytab keytab = NULL;
56 krb5_keytab_entry ktent;
57 krb5_kt_cursor cursor = NULL;
60 memset(key, 0, sizeof(*key));
61 memset(&ktent, 0, sizeof(ktent));
63 code = krb5_kt_default(krbContext, &keytab);
67 if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
68 code = krb5_kt_get_entry(krbContext, keytab,
69 cred->name->krbPrincipal, 0,
70 ctx->encryptionType, &ktent);
74 code = krb5_kt_start_seq_get(krbContext, keytab, &cursor);
78 while ((code = krb5_kt_next_entry(krbContext, keytab,
79 &ktent, &cursor)) == 0) {
80 if (ktent.key.enctype == ctx->encryptionType) {
83 krb5_free_keytab_entry_contents(krbContext, &ktent);
89 *princ = ktent.principal;
94 if (cred == GSS_C_NO_CREDENTIAL || cred->name == GSS_C_NO_NAME)
95 krb5_kt_end_seq_get(krbContext, keytab, &cursor);
96 krb5_kt_close(krbContext, keytab);
100 krb5_free_principal(krbContext, *princ);
103 krb5_free_keyblock_contents(krbContext, key),
104 memset(key, 0, sizeof(key));
111 gssEapMakeReauthCreds(OM_uint32 *minor,
114 gss_buffer_t credBuf)
116 OM_uint32 major = GSS_S_COMPLETE;
117 krb5_error_code code;
118 krb5_context krbContext = NULL;
119 krb5_ticket ticket = { 0 };
120 krb5_keyblock session = { 0 }, acceptorKey = { 0 };
121 krb5_enc_tkt_part enc_part = { 0 };
122 gss_buffer_desc attrBuf = GSS_C_EMPTY_BUFFER;
123 krb5_authdata *authData[2], authDatum = { 0 };
124 krb5_data *ticketData = NULL, *credsData = NULL;
125 krb5_creds creds = { 0 };
126 krb5_auth_context authContext = NULL;
129 credBuf->value = NULL;
131 GSSEAP_KRB_INIT(&krbContext);
133 code = getAcceptorKey(krbContext, ctx, cred,
134 &ticket.server, &acceptorKey);
135 if (code == KRB5_KT_NOTFOUND) {
136 gss_buffer_desc emptyToken = { 0, "" };
139 * If we can't produce the KRB-CRED message, we need to
140 * return an empty (not NULL) token to the caller so we
141 * don't change the number of authentication legs.
143 return duplicateBuffer(minor, &emptyToken, credBuf);
144 } else if (code != 0)
147 enc_part.flags = TKT_FLG_INITIAL;
149 code = krb5_c_make_random_key(krbContext, ctx->encryptionType,
154 enc_part.session = &session;
155 enc_part.client = ctx->initiatorName->krbPrincipal;
156 enc_part.times.authtime = time(NULL);
157 enc_part.times.starttime = enc_part.times.authtime;
158 enc_part.times.endtime = ctx->expiryTime
161 enc_part.times.renew_till = 0;
163 major = gssEapExportAttrContext(minor, ctx->initiatorName,
165 if (GSS_ERROR(major))
168 authDatum.ad_type = KRB5_AUTHDATA_RADIUS_AVP;
169 authDatum.length = attrBuf.length;
170 authDatum.contents = attrBuf.value;
171 authData[0] = &authDatum;
173 enc_part.authorization_data = authData;
175 ticket.enc_part2 = &enc_part;
177 code = krb5_encrypt_tkt_part(krbContext, &acceptorKey, &ticket);
181 code = encode_krb5_ticket(&ticket, &ticketData);
185 creds.client = enc_part.client;
186 creds.server = ticket.server;
187 creds.keyblock = session;
188 creds.times = enc_part.times;
189 creds.ticket_flags = enc_part.flags;
190 creds.ticket = *ticketData;
191 creds.authdata = authData;
193 code = krb5_auth_con_init(krbContext, &authContext);
197 code = krb5_auth_con_setflags(krbContext, authContext, 0);
201 code = krb5_auth_con_setsendsubkey(krbContext, authContext,
206 code = krb5_mk_1cred(krbContext, authContext, &creds, &credsData, NULL);
210 krbDataToGssBuffer(credsData, credBuf);
213 if (ticket.enc_part.ciphertext.data != NULL)
214 GSSEAP_FREE(ticket.enc_part.ciphertext.data);
215 krb5_free_keyblock_contents(krbContext, &session);
216 krb5_free_keyblock_contents(krbContext, &acceptorKey);
217 gss_release_buffer(minor, &attrBuf);
218 krb5_free_data(krbContext, ticketData);
219 krb5_auth_con_free(krbContext, authContext);
220 if (credsData != NULL)
221 GSSEAP_FREE(credsData);
223 if (major == GSS_S_COMPLETE) {
225 major = code != 0 ? GSS_S_FAILURE : GSS_S_COMPLETE;
232 isTicketGrantingServiceP(krb5_context krbContext,
233 krb5_const_principal principal)
235 if (krb5_princ_size(krbContext, principal) == 2 &&
236 krb5_princ_component(krbContext, principal, 0)->length == 6 &&
237 memcmp(krb5_princ_component(krbContext, principal, 0)->data, "krbtgt", 6) == 0)
244 gssEapStoreReauthCreds(OM_uint32 *minor,
247 gss_buffer_t credBuf)
249 OM_uint32 major = GSS_S_COMPLETE, code;
250 krb5_context krbContext = NULL;
251 krb5_auth_context authContext = NULL;
252 krb5_data credData = { 0 };
253 krb5_creds **creds = NULL;
254 krb5_principal canonPrinc;
257 if (credBuf->length == 0 || cred == GSS_C_NO_CREDENTIAL)
258 return GSS_S_COMPLETE;
260 GSSEAP_KRB_INIT(&krbContext);
262 code = krb5_auth_con_init(krbContext, &authContext);
266 code = krb5_auth_con_setflags(krbContext, authContext, 0);
270 code = krb5_auth_con_setrecvsubkey(krbContext, authContext,
275 gssBufferToKrbData(credBuf, &credData);
277 code = krb5_rd_cred(krbContext, authContext, &credData, &creds, NULL);
281 if (creds == NULL || creds[0] == NULL)
284 code = krb5_copy_principal(krbContext, creds[0]->client, &canonPrinc);
288 krb5_free_principal(krbContext, cred->name->krbPrincipal);
289 cred->name->krbPrincipal = canonPrinc;
291 cred->expiryTime = creds[0]->times.endtime;
293 code = krb5_cc_new_unique(krbContext, "MEMORY", NULL, &cred->krbCredCache);
297 code = krb5_cc_initialize(krbContext, cred->krbCredCache,
302 for (i = 0; creds[i] != NULL; i++) {
303 krb5_creds kcred = *(creds[i]);
306 * Swap in the acceptor name the client asked for so
307 * get_credentials() works
309 if (!isTicketGrantingServiceP(krbContext, kcred.server))
310 kcred.server = ctx->acceptorName->krbPrincipal;
312 code = krb5_cc_store_cred(krbContext, cred->krbCredCache, &kcred);
317 major = gss_krb5_import_cred(minor, cred->krbCredCache, NULL, NULL,
319 if (GSS_ERROR(major))
325 krb5_auth_con_free(krbContext, authContext);
327 for (i = 0; creds[i] != NULL; i++)
328 krb5_free_creds(krbContext, creds[i]);
330 if (major == GSS_S_COMPLETE)
331 major = *minor ? GSS_S_FAILURE : GSS_S_COMPLETE;
336 static OM_uint32 (*gssInitSecContextNext)(
339 gss_ctx_id_t *context_handle,
340 gss_name_t target_name,
344 gss_channel_bindings_t input_chan_bindings,
345 gss_buffer_t input_token,
346 gss_OID *actual_mech_type,
347 gss_buffer_t output_token,
348 OM_uint32 *ret_flags,
349 OM_uint32 *time_rec);
351 static OM_uint32 (*gssAcceptSecContextNext)(
353 gss_ctx_id_t *context_handle,
355 gss_buffer_t input_token,
356 gss_channel_bindings_t input_chan_bindings,
357 gss_name_t *src_name,
359 gss_buffer_t output_token,
360 OM_uint32 *ret_flags,
362 gss_cred_id_t *delegated_cred_handle);
364 static OM_uint32 (*gssReleaseCredNext)(
366 gss_cred_id_t *cred_handle);
368 static OM_uint32 (*gssReleaseNameNext)(
372 static OM_uint32 (*gssInquireSecContextByOidNext)(
374 const gss_ctx_id_t context_handle,
375 const gss_OID desired_object,
376 gss_buffer_set_t *data_set);
378 static OM_uint32 (*gssDeleteSecContextNext)(
380 gss_ctx_id_t *context_handle,
381 gss_buffer_t output_token);
383 static OM_uint32 (*gssDisplayNameNext)(
386 gss_buffer_t output_name_buffer,
387 gss_OID *output_name_type);
389 static OM_uint32 (*gssImportNameNext)(
393 gss_name_t *outputName);
395 static OM_uint32 (*gssKrbExtractAuthzDataFromSecContextNext)(
397 const gss_ctx_id_t context_handle,
399 gss_buffer_t ad_data);
401 static OM_uint32 (*gssStoreCredNext)(
403 const gss_cred_id_t input_cred_handle,
404 gss_cred_usage_t input_usage,
405 const gss_OID desired_mech,
406 OM_uint32 overwrite_cred,
407 OM_uint32 default_cred,
408 gss_OID_set *elements_stored,
409 gss_cred_usage_t *cred_usage_stored);
411 #define NEXT_SYMBOL(local, global) ((local) = dlsym(RTLD_NEXT, (global)))
414 gssEapReauthInitialize(OM_uint32 *minor)
416 NEXT_SYMBOL(gssInitSecContextNext, "gss_init_sec_context");
417 NEXT_SYMBOL(gssAcceptSecContextNext, "gss_accept_sec_context");
418 NEXT_SYMBOL(gssReleaseCredNext, "gss_release_cred");
419 NEXT_SYMBOL(gssReleaseNameNext, "gss_release_name");
420 NEXT_SYMBOL(gssInquireSecContextByOidNext, "gss_inquire_sec_context_by_oid");
421 NEXT_SYMBOL(gssDeleteSecContextNext, "gss_delete_sec_context");
422 NEXT_SYMBOL(gssDisplayNameNext, "gss_display_name");
423 NEXT_SYMBOL(gssImportNameNext, "gss_import_name");
424 NEXT_SYMBOL(gssKrbExtractAuthzDataFromSecContextNext, "gsskrb5_extract_authz_data_from_sec_context");
425 NEXT_SYMBOL(gssStoreCredNext, "gss_store_cred");
427 return GSS_S_COMPLETE;
431 gssInitSecContext(OM_uint32 *minor,
433 gss_ctx_id_t *context_handle,
434 gss_name_t target_name,
438 gss_channel_bindings_t input_chan_bindings,
439 gss_buffer_t input_token,
440 gss_OID *actual_mech_type,
441 gss_buffer_t output_token,
442 OM_uint32 *ret_flags,
445 if (gssInitSecContextNext == NULL)
446 return GSS_S_UNAVAILABLE;
448 return gssInitSecContextNext(minor, cred, context_handle,
449 target_name, mech_type, req_flags,
450 time_req, input_chan_bindings,
451 input_token, actual_mech_type,
452 output_token, ret_flags, time_rec);
456 gssAcceptSecContext(OM_uint32 *minor,
457 gss_ctx_id_t *context_handle,
459 gss_buffer_t input_token,
460 gss_channel_bindings_t input_chan_bindings,
461 gss_name_t *src_name,
463 gss_buffer_t output_token,
464 OM_uint32 *ret_flags,
466 gss_cred_id_t *delegated_cred_handle)
468 if (gssAcceptSecContextNext == NULL)
469 return GSS_S_UNAVAILABLE;
471 return gssAcceptSecContextNext(minor, context_handle, cred,
472 input_token, input_chan_bindings,
473 src_name, mech_type, output_token,
474 ret_flags, time_rec, delegated_cred_handle);
478 gssReleaseCred(OM_uint32 *minor,
479 gss_cred_id_t *cred_handle)
481 if (gssReleaseCredNext == NULL)
482 return GSS_S_UNAVAILABLE;
484 return gssReleaseCredNext(minor, cred_handle);
488 gssReleaseName(OM_uint32 *minor,
491 if (gssReleaseName == NULL)
492 return GSS_S_UNAVAILABLE;
494 return gssReleaseNameNext(minor, name);
498 gssDeleteSecContext(OM_uint32 *minor,
499 gss_ctx_id_t *context_handle,
500 gss_buffer_t output_token)
502 if (gssDeleteSecContextNext == NULL)
503 return GSS_S_UNAVAILABLE;
505 return gssDeleteSecContextNext(minor, context_handle, output_token);
509 gssDisplayName(OM_uint32 *minor,
514 if (gssDisplayNameNext == NULL)
515 return GSS_S_UNAVAILABLE;
517 return gssDisplayNameNext(minor, name, buffer, name_type);
521 gssImportName(OM_uint32 *minor,
526 if (gssImportNameNext == NULL)
527 return GSS_S_UNAVAILABLE;
529 return gssImportNameNext(minor, buffer, name_type, name);
533 gssInquireSecContextByOid(OM_uint32 *minor,
534 const gss_ctx_id_t context_handle,
535 const gss_OID desired_object,
536 gss_buffer_set_t *data_set)
538 if (gssInquireSecContextByOidNext == NULL)
539 return GSS_S_UNAVAILABLE;
541 return gssInquireSecContextByOidNext(minor, context_handle,
542 desired_object, data_set);
546 gssKrbExtractAuthzDataFromSecContext(OM_uint32 *minor,
547 const gss_ctx_id_t ctx,
549 gss_buffer_t ad_data)
551 if (gssKrbExtractAuthzDataFromSecContextNext == NULL)
552 return GSS_S_UNAVAILABLE;
554 return gssKrbExtractAuthzDataFromSecContextNext(minor, ctx,
559 gssStoreCred(OM_uint32 *minor,
560 const gss_cred_id_t input_cred_handle,
561 gss_cred_usage_t input_usage,
562 const gss_OID desired_mech,
563 OM_uint32 overwrite_cred,
564 OM_uint32 default_cred,
565 gss_OID_set *elements_stored,
566 gss_cred_usage_t *cred_usage_stored)
568 if (gssStoreCredNext == NULL)
569 return GSS_S_UNAVAILABLE;
571 return gssStoreCredNext(minor, input_cred_handle, input_usage,
572 desired_mech, overwrite_cred, default_cred,
573 elements_stored, cred_usage_stored);
577 gssEapGlueToMechName(OM_uint32 *minor,
579 gss_name_t *pMechName)
581 OM_uint32 major, tmpMinor;
582 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
584 *pMechName = GSS_C_NO_NAME;
586 major = gssDisplayName(minor, glueName, &nameBuf, NULL);
587 if (GSS_ERROR(major))
590 major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
592 if (GSS_ERROR(major))
596 gss_release_buffer(&tmpMinor, &nameBuf);
602 gssEapMechToGlueName(OM_uint32 *minor,
604 gss_name_t *pGlueName)
606 OM_uint32 major, tmpMinor;
607 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
609 *pGlueName = GSS_C_NO_NAME;
611 major = gssEapDisplayName(minor, mechName, &nameBuf, NULL);
612 if (GSS_ERROR(major))
615 major = gssImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
617 if (GSS_ERROR(major))
621 gss_release_buffer(&tmpMinor, &nameBuf);
627 gssEapReauthComplete(OM_uint32 *minor,
633 OM_uint32 major, tmpMinor;
634 gss_buffer_set_t keyData = GSS_C_NO_BUFFER_SET;
636 if (!oidEqual(mech, gss_mech_krb5)) {
637 major = GSS_S_BAD_MECH;
641 major = gssInquireSecContextByOid(minor, ctx->kerberosCtx,
642 GSS_C_INQ_SSPI_SESSION_KEY, &keyData);
643 if (GSS_ERROR(major))
650 oid.length = keyData->elements[1].length;
651 oid.elements = keyData->elements[1].value;
653 /* GSS_KRB5_SESSION_KEY_ENCTYPE_OID */
654 major = decomposeOid(minor,
655 "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04",
657 if (GSS_ERROR(major))
660 ctx->encryptionType = suffix;
664 krb5_context krbContext = NULL;
667 GSSEAP_KRB_INIT(&krbContext);
669 KRB_KEY_LENGTH(&key) = keyData->elements[0].length;
670 KRB_KEY_DATA(&key) = keyData->elements[0].value;
671 KRB_KEY_TYPE(&key) = ctx->encryptionType;
673 *minor = krb5_copy_keyblock_contents(krbContext,
674 &key, &ctx->rfc3961Key);
676 major = GSS_S_FAILURE;
681 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
683 if (GSS_ERROR(major))
686 if (timeRec != GSS_C_INDEFINITE)
687 ctx->expiryTime = time(NULL) + timeRec;
689 major = sequenceInit(minor,
690 &ctx->seqState, ctx->recvSeq,
691 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
692 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
694 if (GSS_ERROR(major))
697 major = GSS_S_COMPLETE;
700 gss_release_buffer_set(&tmpMinor, &keyData);