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"
36 RCSID("$Id: accept_sec_context.c 20199 2007-02-07 22:36:39Z lha $");
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 gsskrb5_acceptor_start(OM_uint32 * minor_status,
256 krb5_context context,
257 const gss_cred_id_t acceptor_cred_handle,
258 const gss_buffer_t input_token_buffer,
259 const gss_channel_bindings_t input_chan_bindings,
260 gss_name_t * src_name,
262 gss_buffer_t output_token,
263 OM_uint32 * ret_flags,
264 OM_uint32 * time_rec,
265 gss_cred_id_t * delegated_cred_handle)
267 krb5_error_code kret;
268 OM_uint32 ret = GSS_S_COMPLETE;
270 krb5_flags ap_options;
271 krb5_keytab keytab = NULL;
273 const gsskrb5_cred acceptor_cred = (gsskrb5_cred)acceptor_cred_handle;
276 * We may, or may not, have an escapsulation.
278 ret = _gsskrb5_decapsulate (minor_status,
285 /* Assume that there is no OID wrapping. */
286 indata.length = input_token_buffer->length;
287 indata.data = input_token_buffer->value;
291 * We need to get our keytab
293 if (acceptor_cred == NULL) {
294 if (_gsskrb5_keytab != NULL)
295 keytab = _gsskrb5_keytab;
296 } else if (acceptor_cred->keytab != NULL) {
297 keytab = acceptor_cred->keytab;
301 * We need to check the ticket and create the AP-REP packet
305 krb5_rd_req_in_ctx in = NULL;
306 krb5_rd_req_out_ctx out = NULL;
308 kret = krb5_rd_req_in_ctx_alloc(context, &in);
310 kret = krb5_rd_req_in_set_keytab(context, in, keytab);
313 krb5_rd_req_in_ctx_free(context, in);
315 *minor_status = kret;
319 kret = krb5_rd_req_ctx(context,
322 (acceptor_cred_handle == GSS_C_NO_CREDENTIAL) ? NULL : acceptor_cred->principal,
324 krb5_rd_req_in_ctx_free(context, in);
327 *minor_status = kret;
332 * We need to remember some data on the context_handle.
334 kret = krb5_rd_req_out_get_ap_req_options(context, out,
337 kret = krb5_rd_req_out_get_ticket(context, out,
340 kret = krb5_rd_req_out_get_keyblock(context, out,
341 &ctx->service_keyblock);
342 ctx->lifetime = ctx->ticket->ticket.endtime;
344 krb5_rd_req_out_ctx_free(context, out);
347 *minor_status = kret;
354 * We need to copy the principal names to the context and the
357 kret = krb5_copy_principal(context,
362 *minor_status = kret;
365 kret = krb5_copy_principal(context,
370 *minor_status = kret;
375 * We need to setup some compat stuff, this assumes that
376 * context_handle->target is already set.
378 ret = _gss_DES3_get_mic_compat(minor_status, ctx, context);
382 if (src_name != NULL) {
383 kret = krb5_copy_principal (context,
385 (gsskrb5_name*)src_name);
388 *minor_status = kret;
394 * We need to get the flags out of the 8003 checksum.
397 krb5_authenticator authenticator;
399 kret = krb5_auth_con_getauthenticator(context,
404 *minor_status = kret;
408 if (authenticator->cksum->cksumtype == CKSUMTYPE_GSSAPI) {
409 ret = _gsskrb5_verify_8003_checksum(minor_status,
411 authenticator->cksum,
415 krb5_free_authenticator(context, &authenticator);
422 kret = krb5_crypto_init(context,
423 ctx->auth_context->keyblock,
426 krb5_free_authenticator(context, &authenticator);
429 *minor_status = kret;
434 * Windows accepts Samba3's use of a kerberos, rather than
435 * GSSAPI checksum here
438 kret = krb5_verify_checksum(context,
439 crypto, KRB5_KU_AP_REQ_AUTH_CKSUM, NULL, 0,
440 authenticator->cksum);
441 krb5_free_authenticator(context, &authenticator);
442 krb5_crypto_destroy(context, crypto);
446 *minor_status = kret;
451 * Samba style get some flags (but not DCE-STYLE)
454 GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG | GSS_C_SEQUENCE_FLAG;
458 if(ctx->flags & GSS_C_MUTUAL_FLAG) {
461 _gsskrb5i_is_cfx(ctx, &is_cfx);
464 || (ap_options & AP_OPTS_USE_SUBKEY)) {
465 kret = krb5_auth_con_addflags(context,
467 KRB5_AUTH_CONTEXT_USE_SUBKEY,
469 ctx->more_flags |= ACCEPTOR_SUBKEY;
472 kret = krb5_mk_rep(context,
476 *minor_status = kret;
477 return GSS_S_FAILURE;
480 if (IS_DCE_STYLE(ctx)) {
481 output_token->length = outbuf.length;
482 output_token->value = outbuf.data;
484 ret = _gsskrb5_encapsulate(minor_status,
489 krb5_data_free (&outbuf);
495 ctx->flags |= GSS_C_TRANS_FLAG;
497 /* Remember the flags */
499 ctx->lifetime = ctx->ticket->ticket.endtime;
500 ctx->more_flags |= OPEN;
503 *mech_type = GSS_KRB5_MECHANISM;
506 ret = _gsskrb5_lifetime_left(minor_status,
516 * When GSS_C_DCE_STYLE is in use, we need ask for a AP-REP from
519 if (IS_DCE_STYLE(ctx)) {
521 * Return flags to caller, but we haven't processed
525 *ret_flags = (ctx->flags & ~GSS_C_DELEG_FLAG);
527 ctx->state = ACCEPTOR_WAIT_FOR_DCESTYLE;
528 return GSS_S_CONTINUE_NEEDED;
531 ret = gsskrb5_acceptor_ready(minor_status, ctx, context,
532 delegated_cred_handle);
535 *ret_flags = ctx->flags;
541 acceptor_wait_for_dcestyle(OM_uint32 * minor_status,
543 krb5_context context,
544 const gss_cred_id_t acceptor_cred_handle,
545 const gss_buffer_t input_token_buffer,
546 const gss_channel_bindings_t input_chan_bindings,
547 gss_name_t * src_name,
549 gss_buffer_t output_token,
550 OM_uint32 * ret_flags,
551 OM_uint32 * time_rec,
552 gss_cred_id_t * delegated_cred_handle)
555 krb5_error_code kret;
557 int32_t r_seq_number, l_seq_number;
560 * We know it's GSS_C_DCE_STYLE so we don't need to decapsulate the AP_REP
563 inbuf.length = input_token_buffer->length;
564 inbuf.data = input_token_buffer->value;
567 * We need to remeber the old remote seq_number, then check if the
568 * client has replied with our local seq_number, and then reset
569 * the remote seq_number to the old value
572 kret = krb5_auth_con_getlocalseqnumber(context,
576 *minor_status = kret;
577 return GSS_S_FAILURE;
580 kret = krb5_auth_getremoteseqnumber(context,
584 *minor_status = kret;
585 return GSS_S_FAILURE;
588 kret = krb5_auth_con_setremoteseqnumber(context,
592 *minor_status = kret;
593 return GSS_S_FAILURE;
598 * We need to verify the AP_REP, but we need to flag that this is
599 * DCE_STYLE, so don't check the timestamps this time, but put the
600 * flag DO_TIME back afterward.
603 krb5_ap_rep_enc_part *repl;
606 krb5_auth_con_removeflags(context,
608 KRB5_AUTH_CONTEXT_DO_TIME,
611 kret = krb5_rd_rep(context, ctx->auth_context, &inbuf, &repl);
613 *minor_status = kret;
614 return GSS_S_FAILURE;
616 krb5_free_ap_rep_enc_part(context, repl);
617 krb5_auth_con_setflags(context, ctx->auth_context, auth_flags);
620 /* We need to check the liftime */
622 OM_uint32 lifetime_rec;
624 ret = _gsskrb5_lifetime_left(minor_status,
631 if (lifetime_rec == 0) {
632 return GSS_S_CONTEXT_EXPIRED;
635 if (time_rec) *time_rec = lifetime_rec;
638 /* We need to give the caller the flags which are in use */
639 if (ret_flags) *ret_flags = ctx->flags;
642 kret = krb5_copy_principal(context,
644 (gsskrb5_name*)src_name);
646 *minor_status = kret;
647 return GSS_S_FAILURE;
652 * After the krb5_rd_rep() the remote and local seq_number should
653 * be the same, because the client just replies the seq_number
654 * from our AP-REP in its AP-REP, but then the client uses the
655 * seq_number from its AP-REQ for GSS_wrap()
658 int32_t tmp_r_seq_number, tmp_l_seq_number;
660 kret = krb5_auth_getremoteseqnumber(context,
664 *minor_status = kret;
665 return GSS_S_FAILURE;
668 kret = krb5_auth_con_getlocalseqnumber(context,
673 *minor_status = kret;
674 return GSS_S_FAILURE;
678 * Here we check if the client has responsed with our local seq_number,
680 if (tmp_r_seq_number != tmp_l_seq_number) {
681 return GSS_S_UNSEQ_TOKEN;
686 * We need to reset the remote seq_number, because the client will use,
687 * the old one for the GSS_wrap() calls
690 kret = krb5_auth_con_setremoteseqnumber(context,
694 *minor_status = kret;
695 return GSS_S_FAILURE;
699 return gsskrb5_acceptor_ready(minor_status, ctx, context,
700 delegated_cred_handle);
705 _gsskrb5_accept_sec_context(OM_uint32 * minor_status,
706 gss_ctx_id_t * context_handle,
707 const gss_cred_id_t acceptor_cred_handle,
708 const gss_buffer_t input_token_buffer,
709 const gss_channel_bindings_t input_chan_bindings,
710 gss_name_t * src_name,
712 gss_buffer_t output_token,
713 OM_uint32 * ret_flags,
714 OM_uint32 * time_rec,
715 gss_cred_id_t * delegated_cred_handle)
717 krb5_context context;
721 GSSAPI_KRB5_INIT(&context);
723 output_token->length = 0;
724 output_token->value = NULL;
726 if (src_name != NULL)
729 *mech_type = GSS_KRB5_MECHANISM;
731 if (*context_handle == GSS_C_NO_CONTEXT) {
732 ret = _gsskrb5_create_ctx(minor_status,
741 ctx = (gsskrb5_ctx)*context_handle;
745 * TODO: check the channel_bindings
746 * (above just sets them to krb5 layer)
749 HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
751 switch (ctx->state) {
753 ret = gsskrb5_acceptor_start(minor_status,
756 acceptor_cred_handle,
764 delegated_cred_handle);
766 case ACCEPTOR_WAIT_FOR_DCESTYLE:
767 ret = acceptor_wait_for_dcestyle(minor_status,
770 acceptor_cred_handle,
778 delegated_cred_handle);
782 * If we get there, the caller have called
783 * gss_accept_sec_context() one time too many.
785 ret = GSS_S_BAD_STATUS;
788 /* TODO: is this correct here? --metze */
789 ret = GSS_S_BAD_STATUS;
793 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
795 if (GSS_ERROR(ret)) {
797 _gsskrb5_delete_sec_context(&min2, context_handle, GSS_C_NO_BUFFER);