2 * Copyright (c) 1997 - 2008 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
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "gsskrb5_locl.h"
37 * copy the addresses from `input_chan_bindings' (if any) to
38 * the auth context `ac'
42 set_addresses (krb5_context context,
44 const gss_channel_bindings_t input_chan_bindings)
46 /* Port numbers are expected to be in application_data.value,
47 * initator's port first */
49 krb5_address initiator_addr, acceptor_addr;
52 if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS
53 || input_chan_bindings->application_data.length !=
54 2 * sizeof(ac->local_port))
57 memset(&initiator_addr, 0, sizeof(initiator_addr));
58 memset(&acceptor_addr, 0, sizeof(acceptor_addr));
61 *(int16_t *) input_chan_bindings->application_data.value;
64 *((int16_t *) input_chan_bindings->application_data.value + 1);
66 kret = _gsskrb5i_address_to_krb5addr(context,
67 input_chan_bindings->acceptor_addrtype,
68 &input_chan_bindings->acceptor_address,
74 kret = _gsskrb5i_address_to_krb5addr(context,
75 input_chan_bindings->initiator_addrtype,
76 &input_chan_bindings->initiator_address,
80 krb5_free_address (context, &acceptor_addr);
84 kret = krb5_auth_con_setaddrs(context,
86 &initiator_addr, /* local address */
87 &acceptor_addr); /* remote address */
89 krb5_free_address (context, &initiator_addr);
90 krb5_free_address (context, &acceptor_addr);
93 free(input_chan_bindings->application_data.value);
94 input_chan_bindings->application_data.value = NULL;
95 input_chan_bindings->application_data.length = 0;
103 OM_uint32 * minor_status,
104 gss_ctx_id_t * context_handle,
105 krb5_context context,
106 const gss_channel_bindings_t input_chan_bindings,
107 enum gss_ctx_id_t_state state)
109 krb5_error_code kret;
112 *context_handle = NULL;
114 ctx = malloc(sizeof(*ctx));
116 *minor_status = ENOMEM;
117 return GSS_S_FAILURE;
119 ctx->auth_context = NULL;
120 ctx->deleg_auth_context = NULL;
128 ctx->service_keyblock = NULL;
130 krb5_data_zero(&ctx->fwd_data);
131 ctx->lifetime = GSS_C_INDEFINITE;
134 HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex);
136 kret = krb5_auth_con_init (context, &ctx->auth_context);
138 *minor_status = kret;
139 HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
140 return GSS_S_FAILURE;
143 kret = krb5_auth_con_init (context, &ctx->deleg_auth_context);
145 *minor_status = kret;
146 krb5_auth_con_free(context, ctx->auth_context);
147 HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
148 return GSS_S_FAILURE;
151 kret = set_addresses(context, ctx->auth_context, input_chan_bindings);
153 *minor_status = kret;
155 krb5_auth_con_free(context, ctx->auth_context);
156 krb5_auth_con_free(context, ctx->deleg_auth_context);
158 HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
160 return GSS_S_BAD_BINDINGS;
163 kret = set_addresses(context, ctx->deleg_auth_context, input_chan_bindings);
165 *minor_status = kret;
167 krb5_auth_con_free(context, ctx->auth_context);
168 krb5_auth_con_free(context, ctx->deleg_auth_context);
170 HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
172 return GSS_S_BAD_BINDINGS;
176 * We need a sequence number
179 krb5_auth_con_addflags(context,
181 KRB5_AUTH_CONTEXT_DO_SEQUENCE |
182 KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED,
186 * We need a sequence number
189 krb5_auth_con_addflags(context,
190 ctx->deleg_auth_context,
191 KRB5_AUTH_CONTEXT_DO_SEQUENCE |
192 KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED,
195 *context_handle = (gss_ctx_id_t)ctx;
197 return GSS_S_COMPLETE;
203 OM_uint32 * minor_status,
204 krb5_context context,
207 const gss_name_t target_name,
210 OM_uint32 * time_rec)
213 krb5_error_code kret;
214 krb5_creds this_cred;
215 OM_uint32 lifetime_rec;
218 krb5_free_principal(context, ctx->target);
222 krb5_free_creds(context, ctx->kcred);
226 ret = _gsskrb5_canon_name(minor_status, context, use_dns,
227 ctx->source, target_name, &ctx->target);
231 memset(&this_cred, 0, sizeof(this_cred));
232 this_cred.client = ctx->source;
233 this_cred.server = ctx->target;
235 if (time_req && time_req != GSS_C_INDEFINITE) {
238 krb5_timeofday (context, &ts);
239 this_cred.times.endtime = ts + time_req;
241 this_cred.times.endtime = 0;
244 this_cred.session.keytype = KEYTYPE_NULL;
246 kret = krb5_get_credentials(context,
252 *minor_status = kret;
253 return GSS_S_FAILURE;
256 ctx->lifetime = ctx->kcred->times.endtime;
258 ret = _gsskrb5_lifetime_left(minor_status, context,
259 ctx->lifetime, &lifetime_rec);
262 if (lifetime_rec == 0) {
264 return GSS_S_CONTEXT_EXPIRED;
267 if (time_rec) *time_rec = lifetime_rec;
269 return GSS_S_COMPLETE;
273 gsskrb5_initiator_ready(
274 OM_uint32 * minor_status,
276 krb5_context context)
281 OM_uint32 flags = ctx->flags;
283 krb5_free_creds(context, ctx->kcred);
286 if (ctx->more_flags & CLOSE_CCACHE)
287 krb5_cc_close(context, ctx->ccache);
290 krb5_auth_con_getremoteseqnumber (context, ctx->auth_context, &seq_number);
292 _gsskrb5i_is_cfx(context, ctx, 0);
293 is_cfx = (ctx->more_flags & IS_CFX);
295 ret = _gssapi_msg_order_create(minor_status,
297 _gssapi_msg_order_f(flags),
298 seq_number, 0, is_cfx);
301 ctx->state = INITIATOR_READY;
302 ctx->more_flags |= OPEN;
304 return GSS_S_COMPLETE;
308 * handle delegated creds in init-sec-context
312 do_delegation (krb5_context context,
313 krb5_auth_context ac,
316 krb5_const_principal name,
322 KDCOptions fwd_flags;
323 krb5_error_code kret;
325 memset (&creds, 0, sizeof(creds));
326 krb5_data_zero (fwd_data);
328 kret = krb5_cc_get_principal(context, ccache, &creds.client);
332 kret = krb5_make_principal(context,
341 creds.times.endtime = 0;
343 memset(&fwd_flags, 0, sizeof(fwd_flags));
344 fwd_flags.forwarded = 1;
345 fwd_flags.forwardable = 1;
347 if ( /*target_name->name.name_type != KRB5_NT_SRV_HST ||*/
348 name->name.name_string.len < 2)
351 kret = krb5_get_forwarded_creds(context,
354 KDCOptions2int(fwd_flags),
355 name->name.name_string.val[1],
366 krb5_free_principal(context, creds.client);
368 krb5_free_principal(context, creds.server);
372 * first stage of init-sec-context
377 (OM_uint32 * minor_status,
380 krb5_context context,
382 const gss_OID mech_type,
385 const gss_buffer_t input_token,
386 gss_OID * actual_mech_type,
387 gss_buffer_t output_token,
388 OM_uint32 * ret_flags,
392 OM_uint32 ret = GSS_S_FAILURE;
393 krb5_error_code kret;
396 OM_uint32 lifetime_rec;
399 krb5_data_zero(&outbuf);
400 krb5_data_zero(&fwd_data);
404 if (actual_mech_type)
405 *actual_mech_type = GSS_KRB5_MECHANISM;
408 kret = krb5_cc_default (context, &ctx->ccache);
410 *minor_status = kret;
414 ctx->more_flags |= CLOSE_CCACHE;
416 ctx->ccache = cred->ccache;
418 kret = krb5_cc_get_principal (context, ctx->ccache, &ctx->source);
420 *minor_status = kret;
425 ret = _gss_DES3_get_mic_compat(minor_status, ctx, context);
431 * This is hideous glue for (NFS) clients that wants to limit the
432 * available enctypes to what it can support (encryption in
433 * kernel). If there is no enctypes selected for this credential,
434 * reset it to the default set of enctypes.
437 krb5_enctype *enctypes = NULL;
439 if (cred && cred->enctypes)
440 enctypes = cred->enctypes;
441 krb5_set_default_in_tkt_etypes(context, enctypes);
444 /* canon name if needed for client + target realm */
445 kret = krb5_cc_get_config(context, ctx->ccache, NULL,
446 "realm-config", &outbuf);
448 /* XXX 2 is no server canon */
449 if (outbuf.length < 1 || ((((unsigned char *)outbuf.data)[0]) & 2))
451 krb5_data_free(&outbuf);
455 * First we try w/o dns, hope that the KDC have register alias
456 * (and referrals if cross realm) for this principal. If that
457 * fails and if we are allowed to using this realm try again with
458 * DNS canonicalizion.
460 ret = gsskrb5_get_creds(minor_status, context, ctx->ccache,
461 ctx, name, 0, time_req,
463 if (ret && allow_dns)
464 ret = gsskrb5_get_creds(minor_status, context, ctx->ccache,
465 ctx, name, 1, time_req,
470 ctx->lifetime = ctx->kcred->times.endtime;
472 ret = _gsskrb5_lifetime_left(minor_status,
479 if (lifetime_rec == 0) {
481 ret = GSS_S_CONTEXT_EXPIRED;
485 krb5_auth_con_setkey(context,
487 &ctx->kcred->session);
489 kret = krb5_auth_con_generatelocalsubkey(context,
491 &ctx->kcred->session);
493 *minor_status = kret;
498 return GSS_S_COMPLETE;
501 if (ctx->ccache && (ctx->more_flags & CLOSE_CCACHE))
502 krb5_cc_close(context, ctx->ccache);
511 (OM_uint32 * minor_status,
514 krb5_context context,
516 const gss_channel_bindings_t input_chan_bindings,
517 const gss_buffer_t input_token,
518 gss_OID * actual_mech_type,
519 gss_buffer_t output_token,
520 OM_uint32 * ret_flags,
524 OM_uint32 ret = GSS_S_FAILURE;
525 krb5_error_code kret;
526 krb5_flags ap_options;
529 krb5_data authenticator;
531 krb5_enctype enctype;
532 krb5_data fwd_data, timedata;
533 int32_t offset = 0, oldoffset;
536 krb5_data_zero(&outbuf);
537 krb5_data_zero(&fwd_data);
542 * If the credential doesn't have ok-as-delegate, check if there
543 * is a realm setting and use that.
545 if (!ctx->kcred->flags.b.ok_as_delegate) {
548 ret = krb5_cc_get_config(context, ctx->ccache, NULL,
549 "realm-config", &data);
551 /* XXX 1 is use ok-as-delegate */
552 if (data.length < 1 || ((((unsigned char *)data.data)[0]) & 1) == 0)
553 req_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
554 krb5_data_free(&data);
560 /* if we used GSS_C_DELEG_POLICY_FLAG, trust KDC */
561 if ((req_flags & GSS_C_DELEG_POLICY_FLAG)
562 && ctx->kcred->flags.b.ok_as_delegate)
563 flagmask |= GSS_C_DELEG_FLAG | GSS_C_DELEG_POLICY_FLAG;
564 /* if there still is a GSS_C_DELEG_FLAG, use that */
565 if (req_flags & GSS_C_DELEG_FLAG)
566 flagmask |= GSS_C_DELEG_FLAG;
571 if (flagmask & GSS_C_DELEG_FLAG) {
572 do_delegation (context,
573 ctx->deleg_auth_context,
574 ctx->ccache, ctx->kcred, ctx->target,
575 &fwd_data, flagmask, &flags);
578 if (req_flags & GSS_C_MUTUAL_FLAG) {
579 flags |= GSS_C_MUTUAL_FLAG;
580 ap_options |= AP_OPTS_MUTUAL_REQUIRED;
583 if (req_flags & GSS_C_REPLAY_FLAG)
584 flags |= GSS_C_REPLAY_FLAG;
585 if (req_flags & GSS_C_SEQUENCE_FLAG)
586 flags |= GSS_C_SEQUENCE_FLAG;
588 if (req_flags & GSS_C_ANON_FLAG)
591 if (req_flags & GSS_C_DCE_STYLE) {
592 /* GSS_C_DCE_STYLE implies GSS_C_MUTUAL_FLAG */
593 flags |= GSS_C_DCE_STYLE | GSS_C_MUTUAL_FLAG;
594 ap_options |= AP_OPTS_MUTUAL_REQUIRED;
596 if (req_flags & GSS_C_IDENTIFY_FLAG)
597 flags |= GSS_C_IDENTIFY_FLAG;
598 if (req_flags & GSS_C_EXTENDED_ERROR_FLAG)
599 flags |= GSS_C_EXTENDED_ERROR_FLAG;
601 if (req_flags & GSS_C_CONF_FLAG) {
602 flags |= GSS_C_CONF_FLAG;
604 if (req_flags & GSS_C_INTEG_FLAG) {
605 flags |= GSS_C_INTEG_FLAG;
607 if (cred == NULL || !(cred->cred_flags & GSS_CF_NO_CI_FLAGS)) {
608 flags |= GSS_C_CONF_FLAG;
609 flags |= GSS_C_INTEG_FLAG;
611 flags |= GSS_C_TRANS_FLAG;
616 ctx->more_flags |= LOCAL;
618 ret = _gsskrb5_create_8003_checksum (minor_status,
623 krb5_data_free (&fwd_data);
627 enctype = ctx->auth_context->keyblock->keytype;
629 ret = krb5_cc_get_config(context, ctx->ccache, ctx->target,
630 "time-offset", &timedata);
632 if (timedata.length == 4) {
633 const u_char *p = timedata.data;
634 offset = (p[0] <<24) | (p[1] << 16) | (p[2] << 8) | (p[3] << 0);
636 krb5_data_free(&timedata);
640 krb5_get_kdc_sec_offset (context, &oldoffset, NULL);
641 krb5_set_kdc_sec_offset (context, offset, -1);
644 kret = _krb5_build_authenticator(context,
650 KRB5_KU_AP_REQ_AUTH);
654 krb5_set_kdc_sec_offset (context, oldoffset, -1);
655 *minor_status = kret;
660 kret = krb5_build_ap_req (context,
667 krb5_set_kdc_sec_offset (context, oldoffset, -1);
669 *minor_status = kret;
674 if (flags & GSS_C_DCE_STYLE) {
675 output_token->value = outbuf.data;
676 output_token->length = outbuf.length;
678 ret = _gsskrb5_encapsulate (minor_status, &outbuf, output_token,
679 (u_char *)"\x01\x00", GSS_KRB5_MECHANISM);
680 krb5_data_free (&outbuf);
685 free_Checksum(&cksum);
687 if (flags & GSS_C_MUTUAL_FLAG) {
688 ctx->state = INITIATOR_WAIT_FOR_MUTAL;
689 return GSS_S_CONTINUE_NEEDED;
692 return gsskrb5_initiator_ready(minor_status, ctx, context);
694 if (ctx->ccache && (ctx->more_flags & CLOSE_CCACHE))
695 krb5_cc_close(context, ctx->ccache);
704 (OM_uint32 * minor_status,
706 krb5_context context,
707 const gss_OID mech_type,
710 const gss_channel_bindings_t input_chan_bindings,
711 const gss_buffer_t input_token,
712 gss_OID * actual_mech_type,
713 gss_buffer_t output_token,
714 OM_uint32 * ret_flags,
719 krb5_error_code kret;
721 krb5_ap_rep_enc_part *repl;
723 output_token->length = 0;
724 output_token->value = NULL;
726 if (actual_mech_type)
727 *actual_mech_type = GSS_KRB5_MECHANISM;
729 if (IS_DCE_STYLE(ctx)) {
730 /* There is no OID wrapping. */
731 indata.length = input_token->length;
732 indata.data = input_token->value;
734 ret = _gsskrb5_decapsulate (minor_status,
739 if (ret == GSS_S_DEFECTIVE_TOKEN) {
740 /* check if there is an error token sent instead */
741 ret = _gsskrb5_decapsulate (minor_status,
746 if (ret == GSS_S_COMPLETE) {
749 kret = krb5_rd_error(context, &indata, &error);
751 kret = krb5_error_from_rd_error(context, &error, NULL);
753 /* save the time skrew for this host */
754 if (kret == KRB5KRB_AP_ERR_SKEW) {
757 int32_t t = error.stime - time(NULL);
759 p[0] = (t >> 24) & 0xFF;
760 p[1] = (t >> 16) & 0xFF;
761 p[2] = (t >> 8) & 0xFF;
762 p[3] = (t >> 0) & 0xFF;
765 timedata.length = sizeof(p);
767 krb5_cc_set_config(context, ctx->ccache, ctx->target,
768 "time-offset", &timedata);
770 if ((ctx->more_flags & RETRIED) == 0)
771 ctx->state = INITIATOR_RESTART;
772 ctx->more_flags |= RETRIED;
774 free_KRB_ERROR (&error);
776 *minor_status = kret;
777 return GSS_S_FAILURE;
783 kret = krb5_rd_rep (context,
788 *minor_status = kret;
789 return GSS_S_FAILURE;
791 krb5_free_ap_rep_enc_part (context,
796 ret = _gsskrb5_lifetime_left(minor_status,
801 ret = GSS_S_COMPLETE;
804 *ret_flags = ctx->flags;
806 if (req_flags & GSS_C_DCE_STYLE) {
807 int32_t local_seq, remote_seq;
811 * So DCE_STYLE is strange. The client echos the seq number
812 * that the server used in the server's mk_rep in its own
813 * mk_rep(). After when done, it resets to it's own seq number
814 * for the gss_wrap calls.
817 krb5_auth_con_getremoteseqnumber(context, ctx->auth_context, &remote_seq);
818 krb5_auth_con_getlocalseqnumber(context, ctx->auth_context, &local_seq);
819 krb5_auth_con_setlocalseqnumber(context, ctx->auth_context, remote_seq);
821 kret = krb5_mk_rep(context, ctx->auth_context, &outbuf);
823 *minor_status = kret;
824 return GSS_S_FAILURE;
827 /* reset local seq number */
828 krb5_auth_con_setlocalseqnumber(context, ctx->auth_context, local_seq);
830 output_token->length = outbuf.length;
831 output_token->value = outbuf.data;
834 return gsskrb5_initiator_ready(minor_status, ctx, context);
838 * gss_init_sec_context
841 OM_uint32 GSSAPI_CALLCONV _gsskrb5_init_sec_context
842 (OM_uint32 * minor_status,
843 const gss_cred_id_t cred_handle,
844 gss_ctx_id_t * context_handle,
845 const gss_name_t target_name,
846 const gss_OID mech_type,
849 const gss_channel_bindings_t input_chan_bindings,
850 const gss_buffer_t input_token,
851 gss_OID * actual_mech_type,
852 gss_buffer_t output_token,
853 OM_uint32 * ret_flags,
857 krb5_context context;
858 gsskrb5_cred cred = (gsskrb5_cred)cred_handle;
862 GSSAPI_KRB5_INIT (&context);
864 output_token->length = 0;
865 output_token->value = NULL;
867 if (context_handle == NULL) {
869 return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
877 if (target_name == GSS_C_NO_NAME) {
878 if (actual_mech_type)
879 *actual_mech_type = GSS_C_NO_OID;
881 return GSS_S_BAD_NAME;
884 if (mech_type != GSS_C_NO_OID &&
885 !gss_oid_equal(mech_type, GSS_KRB5_MECHANISM))
886 return GSS_S_BAD_MECH;
888 if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
891 if (*context_handle != GSS_C_NO_CONTEXT) {
893 return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
896 ret = _gsskrb5_create_ctx(minor_status,
905 if (*context_handle == GSS_C_NO_CONTEXT) {
907 return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
910 ctx = (gsskrb5_ctx) *context_handle;
912 HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
915 switch (ctx->state) {
916 case INITIATOR_START:
917 ret = init_auth(minor_status,
930 if (ret != GSS_S_COMPLETE)
933 case INITIATOR_RESTART:
934 ret = init_auth_restart(minor_status,
946 case INITIATOR_WAIT_FOR_MUTAL:
947 ret = repl_mutual(minor_status,
959 if (ctx->state == INITIATOR_RESTART)
962 case INITIATOR_READY:
964 * If we get there, the caller have called
965 * gss_init_sec_context() one time too many.
967 _gsskrb5_set_status(EINVAL, "init_sec_context "
968 "called one time too many");
969 *minor_status = EINVAL;
970 ret = GSS_S_BAD_STATUS;
973 _gsskrb5_set_status(EINVAL, "init_sec_context "
974 "invalid state %d for client",
976 *minor_status = EINVAL;
977 ret = GSS_S_BAD_STATUS;
980 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
982 /* destroy context in case of error */
983 if (GSS_ERROR(ret)) {
985 _gsskrb5_delete_sec_context(&min2, context_handle, GSS_C_NO_BUFFER);