2 * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "krb5/gsskrb5_locl.h"
38 HEIMDAL_MUTEX gssapi_keytab_mutex = HEIMDAL_MUTEX_INITIALIZER;
39 krb5_keytab _gsskrb5_keytab;
42 _gsskrb5_register_acceptor_identity (const char *identity)
47 ret = _gsskrb5_init(&context);
51 HEIMDAL_MUTEX_lock(&gssapi_keytab_mutex);
53 if(_gsskrb5_keytab != NULL) {
54 krb5_kt_close(context, _gsskrb5_keytab);
55 _gsskrb5_keytab = NULL;
57 if (identity == NULL) {
58 ret = krb5_kt_default(context, &_gsskrb5_keytab);
62 asprintf(&p, "FILE:%s", identity);
64 HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);
67 ret = krb5_kt_resolve(context, p, &_gsskrb5_keytab);
70 HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);
73 return GSS_S_COMPLETE;
77 _gsskrb5i_is_cfx(gsskrb5_ctx ctx, int *is_cfx)
80 int acceptor = (ctx->more_flags & LOCAL) == 0;
85 if (ctx->auth_context->local_subkey)
86 key = ctx->auth_context->local_subkey;
88 key = ctx->auth_context->remote_subkey;
90 if (ctx->auth_context->remote_subkey)
91 key = ctx->auth_context->remote_subkey;
93 key = ctx->auth_context->local_subkey;
96 key = ctx->auth_context->keyblock;
101 switch (key->keytype) {
102 case ETYPE_DES_CBC_CRC:
103 case ETYPE_DES_CBC_MD4:
104 case ETYPE_DES_CBC_MD5:
105 case ETYPE_DES3_CBC_MD5:
106 case ETYPE_DES3_CBC_SHA1:
107 case ETYPE_ARCFOUR_HMAC_MD5:
108 case ETYPE_ARCFOUR_HMAC_MD5_56:
112 if ((acceptor && ctx->auth_context->local_subkey) ||
113 (!acceptor && ctx->auth_context->remote_subkey))
114 ctx->more_flags |= ACCEPTOR_SUBKEY;
121 gsskrb5_accept_delegated_token
122 (OM_uint32 * minor_status,
124 krb5_context context,
125 gss_cred_id_t * delegated_cred_handle
128 krb5_ccache ccache = NULL;
129 krb5_error_code kret;
130 int32_t ac_flags, ret = GSS_S_COMPLETE;
134 /* XXX Create a new delegated_cred_handle? */
135 if (delegated_cred_handle == NULL) {
136 kret = krb5_cc_default (context, &ccache);
138 *delegated_cred_handle = NULL;
139 kret = krb5_cc_gen_new (context, &krb5_mcc_ops, &ccache);
142 ctx->flags &= ~GSS_C_DELEG_FLAG;
146 kret = krb5_cc_initialize(context, ccache, ctx->source);
148 ctx->flags &= ~GSS_C_DELEG_FLAG;
152 krb5_auth_con_removeflags(context,
154 KRB5_AUTH_CONTEXT_DO_TIME,
156 kret = krb5_rd_cred2(context,
160 krb5_auth_con_setflags(context,
164 ctx->flags &= ~GSS_C_DELEG_FLAG;
166 *minor_status = kret;
170 if (delegated_cred_handle) {
173 ret = _gsskrb5_import_cred(minor_status,
177 delegated_cred_handle);
178 if (ret != GSS_S_COMPLETE)
181 handle = (gsskrb5_cred) *delegated_cred_handle;
183 handle->cred_flags |= GSS_CF_DESTROY_CRED_ON_RELEASE;
184 krb5_cc_close(context, ccache);
190 /* Don't destroy the default cred cache */
191 if (delegated_cred_handle == NULL)
192 krb5_cc_close(context, ccache);
194 krb5_cc_destroy(context, ccache);
200 gsskrb5_acceptor_ready(OM_uint32 * minor_status,
202 krb5_context context,
203 gss_cred_id_t *delegated_cred_handle)
209 krb5_auth_getremoteseqnumber (context,
213 _gsskrb5i_is_cfx(ctx, &is_cfx);
215 ret = _gssapi_msg_order_create(minor_status,
217 _gssapi_msg_order_f(ctx->flags),
218 seq_number, 0, is_cfx);
223 * If requested, set local sequence num to remote sequence if this
224 * isn't a mutual authentication context
226 if (!(ctx->flags & GSS_C_MUTUAL_FLAG) && _gssapi_msg_order_f(ctx->flags)) {
227 krb5_auth_con_setlocalseqnumber(context,
233 * We should handle the delegation ticket, in case it's there
235 if (ctx->fwd_data.length > 0 && (ctx->flags & GSS_C_DELEG_FLAG)) {
236 ret = gsskrb5_accept_delegated_token(minor_status,
239 delegated_cred_handle);
243 /* Well, looks like it wasn't there after all */
244 ctx->flags &= ~GSS_C_DELEG_FLAG;
247 ctx->state = ACCEPTOR_READY;
248 ctx->more_flags |= OPEN;
250 return GSS_S_COMPLETE;
254 send_error_token(OM_uint32 *minor_status,
255 krb5_context context,
256 krb5_error_code kret,
257 krb5_principal server,
259 gss_buffer_t output_token)
261 krb5_principal ap_req_server = NULL;
265 /* build server from request if the acceptor had not selected one */
266 if (server == NULL) {
269 ret = krb5_decode_ap_req(context, indata, &ap_req);
272 return GSS_S_FAILURE;
274 ret = _krb5_principalname2krb5_principal(context,
277 ap_req.ticket.realm);
278 free_AP_REQ(&ap_req);
281 return GSS_S_FAILURE;
283 server = ap_req_server;
286 ret = krb5_mk_error(context, kret, NULL, NULL, NULL,
287 server, NULL, NULL, &outbuf);
289 krb5_free_principal(context, ap_req_server);
292 return GSS_S_FAILURE;
295 ret = _gsskrb5_encapsulate(minor_status,
300 krb5_data_free (&outbuf);
305 return GSS_S_CONTINUE_NEEDED;
310 gsskrb5_acceptor_start(OM_uint32 * minor_status,
312 krb5_context context,
313 const gss_cred_id_t acceptor_cred_handle,
314 const gss_buffer_t input_token_buffer,
315 const gss_channel_bindings_t input_chan_bindings,
316 gss_name_t * src_name,
318 gss_buffer_t output_token,
319 OM_uint32 * ret_flags,
320 OM_uint32 * time_rec,
321 gss_cred_id_t * delegated_cred_handle)
323 krb5_error_code kret;
324 OM_uint32 ret = GSS_S_COMPLETE;
326 krb5_flags ap_options;
327 krb5_keytab keytab = NULL;
329 const gsskrb5_cred acceptor_cred = (gsskrb5_cred)acceptor_cred_handle;
332 * We may, or may not, have an escapsulation.
334 ret = _gsskrb5_decapsulate (minor_status,
341 /* Assume that there is no OID wrapping. */
342 indata.length = input_token_buffer->length;
343 indata.data = input_token_buffer->value;
347 * We need to get our keytab
349 if (acceptor_cred == NULL) {
350 if (_gsskrb5_keytab != NULL)
351 keytab = _gsskrb5_keytab;
352 } else if (acceptor_cred->keytab != NULL) {
353 keytab = acceptor_cred->keytab;
357 * We need to check the ticket and create the AP-REP packet
361 krb5_rd_req_in_ctx in = NULL;
362 krb5_rd_req_out_ctx out = NULL;
363 krb5_principal server = NULL;
366 server = acceptor_cred->principal;
368 kret = krb5_rd_req_in_ctx_alloc(context, &in);
370 kret = krb5_rd_req_in_set_keytab(context, in, keytab);
373 krb5_rd_req_in_ctx_free(context, in);
374 *minor_status = kret;
375 return GSS_S_FAILURE;
378 kret = krb5_rd_req_ctx(context,
383 krb5_rd_req_in_ctx_free(context, in);
384 if (kret == KRB5KRB_AP_ERR_SKEW) {
386 * No reply in non-MUTUAL mode, but we don't know that its
387 * non-MUTUAL mode yet, thats inside the 8003 checksum, so
388 * lets only send the error token on clock skew, that
389 * limit when send error token for non-MUTUAL.
391 return send_error_token(minor_status, context, kret,
392 server, &indata, output_token);
394 *minor_status = kret;
395 return GSS_S_FAILURE;
399 * we need to remember some data on the context_handle.
401 kret = krb5_rd_req_out_get_ap_req_options(context, out,
404 kret = krb5_rd_req_out_get_ticket(context, out,
407 kret = krb5_rd_req_out_get_keyblock(context, out,
408 &ctx->service_keyblock);
409 ctx->lifetime = ctx->ticket->ticket.endtime;
411 krb5_rd_req_out_ctx_free(context, out);
414 *minor_status = kret;
421 * We need to copy the principal names to the context and the
424 kret = krb5_copy_principal(context,
429 *minor_status = kret;
432 kret = krb5_copy_principal(context,
437 *minor_status = kret;
442 * We need to setup some compat stuff, this assumes that
443 * context_handle->target is already set.
445 ret = _gss_DES3_get_mic_compat(minor_status, ctx, context);
449 if (src_name != NULL) {
450 kret = krb5_copy_principal (context,
452 (gsskrb5_name*)src_name);
455 *minor_status = kret;
461 * We need to get the flags out of the 8003 checksum.
464 krb5_authenticator authenticator;
466 kret = krb5_auth_con_getauthenticator(context,
471 *minor_status = kret;
475 if (authenticator->cksum->cksumtype == CKSUMTYPE_GSSAPI) {
476 ret = _gsskrb5_verify_8003_checksum(minor_status,
478 authenticator->cksum,
482 krb5_free_authenticator(context, &authenticator);
489 kret = krb5_crypto_init(context,
490 ctx->auth_context->keyblock,
493 krb5_free_authenticator(context, &authenticator);
496 *minor_status = kret;
501 * Windows accepts Samba3's use of a kerberos, rather than
502 * GSSAPI checksum here
505 kret = krb5_verify_checksum(context,
506 crypto, KRB5_KU_AP_REQ_AUTH_CKSUM, NULL, 0,
507 authenticator->cksum);
508 krb5_free_authenticator(context, &authenticator);
509 krb5_crypto_destroy(context, crypto);
513 *minor_status = kret;
518 * Samba style get some flags (but not DCE-STYLE)
521 GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG | GSS_C_SEQUENCE_FLAG;
525 if(ctx->flags & GSS_C_MUTUAL_FLAG) {
529 _gsskrb5i_is_cfx(ctx, &is_cfx);
531 if (is_cfx || (ap_options & AP_OPTS_USE_SUBKEY)) {
537 * If there is a initiator subkey, copy that to acceptor
538 * subkey to match Windows behavior
540 kret = krb5_auth_con_getremotesubkey(context,
544 kret = krb5_auth_con_setlocalsubkey(context,
549 krb5_free_keyblock(context, rkey);
553 ctx->more_flags |= ACCEPTOR_SUBKEY;
554 krb5_auth_con_addflags(context, ctx->auth_context,
555 KRB5_AUTH_CONTEXT_USE_SUBKEY,
559 kret = krb5_mk_rep(context,
563 *minor_status = kret;
564 return GSS_S_FAILURE;
567 if (IS_DCE_STYLE(ctx)) {
568 output_token->length = outbuf.length;
569 output_token->value = outbuf.data;
571 ret = _gsskrb5_encapsulate(minor_status,
576 krb5_data_free (&outbuf);
582 ctx->flags |= GSS_C_TRANS_FLAG;
584 /* Remember the flags */
586 ctx->lifetime = ctx->ticket->ticket.endtime;
587 ctx->more_flags |= OPEN;
590 *mech_type = GSS_KRB5_MECHANISM;
593 ret = _gsskrb5_lifetime_left(minor_status,
603 * When GSS_C_DCE_STYLE is in use, we need ask for a AP-REP from
606 if (IS_DCE_STYLE(ctx)) {
608 * Return flags to caller, but we haven't processed
612 *ret_flags = (ctx->flags & ~GSS_C_DELEG_FLAG);
614 ctx->state = ACCEPTOR_WAIT_FOR_DCESTYLE;
615 return GSS_S_CONTINUE_NEEDED;
618 ret = gsskrb5_acceptor_ready(minor_status, ctx, context,
619 delegated_cred_handle);
622 *ret_flags = ctx->flags;
628 acceptor_wait_for_dcestyle(OM_uint32 * minor_status,
630 krb5_context context,
631 const gss_cred_id_t acceptor_cred_handle,
632 const gss_buffer_t input_token_buffer,
633 const gss_channel_bindings_t input_chan_bindings,
634 gss_name_t * src_name,
636 gss_buffer_t output_token,
637 OM_uint32 * ret_flags,
638 OM_uint32 * time_rec,
639 gss_cred_id_t * delegated_cred_handle)
642 krb5_error_code kret;
644 int32_t r_seq_number, l_seq_number;
647 * We know it's GSS_C_DCE_STYLE so we don't need to decapsulate the AP_REP
650 inbuf.length = input_token_buffer->length;
651 inbuf.data = input_token_buffer->value;
654 * We need to remeber the old remote seq_number, then check if the
655 * client has replied with our local seq_number, and then reset
656 * the remote seq_number to the old value
659 kret = krb5_auth_con_getlocalseqnumber(context,
663 *minor_status = kret;
664 return GSS_S_FAILURE;
667 kret = krb5_auth_getremoteseqnumber(context,
671 *minor_status = kret;
672 return GSS_S_FAILURE;
675 kret = krb5_auth_con_setremoteseqnumber(context,
679 *minor_status = kret;
680 return GSS_S_FAILURE;
685 * We need to verify the AP_REP, but we need to flag that this is
686 * DCE_STYLE, so don't check the timestamps this time, but put the
687 * flag DO_TIME back afterward.
690 krb5_ap_rep_enc_part *repl;
693 krb5_auth_con_removeflags(context,
695 KRB5_AUTH_CONTEXT_DO_TIME,
698 kret = krb5_rd_rep(context, ctx->auth_context, &inbuf, &repl);
700 *minor_status = kret;
701 return GSS_S_FAILURE;
703 krb5_free_ap_rep_enc_part(context, repl);
704 krb5_auth_con_setflags(context, ctx->auth_context, auth_flags);
707 /* We need to check the liftime */
709 OM_uint32 lifetime_rec;
711 ret = _gsskrb5_lifetime_left(minor_status,
718 if (lifetime_rec == 0) {
719 return GSS_S_CONTEXT_EXPIRED;
722 if (time_rec) *time_rec = lifetime_rec;
725 /* We need to give the caller the flags which are in use */
726 if (ret_flags) *ret_flags = ctx->flags;
729 kret = krb5_copy_principal(context,
731 (gsskrb5_name*)src_name);
733 *minor_status = kret;
734 return GSS_S_FAILURE;
739 * After the krb5_rd_rep() the remote and local seq_number should
740 * be the same, because the client just replies the seq_number
741 * from our AP-REP in its AP-REP, but then the client uses the
742 * seq_number from its AP-REQ for GSS_wrap()
745 int32_t tmp_r_seq_number, tmp_l_seq_number;
747 kret = krb5_auth_getremoteseqnumber(context,
751 *minor_status = kret;
752 return GSS_S_FAILURE;
755 kret = krb5_auth_con_getlocalseqnumber(context,
760 *minor_status = kret;
761 return GSS_S_FAILURE;
765 * Here we check if the client has responsed with our local seq_number,
767 if (tmp_r_seq_number != tmp_l_seq_number) {
768 return GSS_S_UNSEQ_TOKEN;
773 * We need to reset the remote seq_number, because the client will use,
774 * the old one for the GSS_wrap() calls
777 kret = krb5_auth_con_setremoteseqnumber(context,
781 *minor_status = kret;
782 return GSS_S_FAILURE;
786 return gsskrb5_acceptor_ready(minor_status, ctx, context,
787 delegated_cred_handle);
792 _gsskrb5_accept_sec_context(OM_uint32 * minor_status,
793 gss_ctx_id_t * context_handle,
794 const gss_cred_id_t acceptor_cred_handle,
795 const gss_buffer_t input_token_buffer,
796 const gss_channel_bindings_t input_chan_bindings,
797 gss_name_t * src_name,
799 gss_buffer_t output_token,
800 OM_uint32 * ret_flags,
801 OM_uint32 * time_rec,
802 gss_cred_id_t * delegated_cred_handle)
804 krb5_context context;
808 GSSAPI_KRB5_INIT(&context);
810 output_token->length = 0;
811 output_token->value = NULL;
813 if (src_name != NULL)
816 *mech_type = GSS_KRB5_MECHANISM;
818 if (*context_handle == GSS_C_NO_CONTEXT) {
819 ret = _gsskrb5_create_ctx(minor_status,
828 ctx = (gsskrb5_ctx)*context_handle;
832 * TODO: check the channel_bindings
833 * (above just sets them to krb5 layer)
836 HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
838 switch (ctx->state) {
840 ret = gsskrb5_acceptor_start(minor_status,
843 acceptor_cred_handle,
851 delegated_cred_handle);
853 case ACCEPTOR_WAIT_FOR_DCESTYLE:
854 ret = acceptor_wait_for_dcestyle(minor_status,
857 acceptor_cred_handle,
865 delegated_cred_handle);
869 * If we get there, the caller have called
870 * gss_accept_sec_context() one time too many.
872 ret = GSS_S_BAD_STATUS;
875 /* TODO: is this correct here? --metze */
876 ret = GSS_S_BAD_STATUS;
880 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
882 if (GSS_ERROR(ret)) {
884 _gsskrb5_delete_sec_context(&min2, context_handle, GSS_C_NO_BUFFER);