2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer in the
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34 #include "krb5/gsskrb5_locl.h"
36 RCSID("$Id: init_sec_context.c 23422 2008-07-26 18:38:29Z lha $");
39 * copy the addresses from `input_chan_bindings' (if any) to
40 * the auth context `ac'
44 set_addresses (krb5_context context,
46 const gss_channel_bindings_t input_chan_bindings)
48 /* Port numbers are expected to be in application_data.value,
49 * initator's port first */
51 krb5_address initiator_addr, acceptor_addr;
54 if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS
55 || input_chan_bindings->application_data.length !=
56 2 * sizeof(ac->local_port))
59 memset(&initiator_addr, 0, sizeof(initiator_addr));
60 memset(&acceptor_addr, 0, sizeof(acceptor_addr));
63 *(int16_t *) input_chan_bindings->application_data.value;
66 *((int16_t *) input_chan_bindings->application_data.value + 1);
68 kret = _gsskrb5i_address_to_krb5addr(context,
69 input_chan_bindings->acceptor_addrtype,
70 &input_chan_bindings->acceptor_address,
76 kret = _gsskrb5i_address_to_krb5addr(context,
77 input_chan_bindings->initiator_addrtype,
78 &input_chan_bindings->initiator_address,
82 krb5_free_address (context, &acceptor_addr);
86 kret = krb5_auth_con_setaddrs(context,
88 &initiator_addr, /* local address */
89 &acceptor_addr); /* remote address */
91 krb5_free_address (context, &initiator_addr);
92 krb5_free_address (context, &acceptor_addr);
95 free(input_chan_bindings->application_data.value);
96 input_chan_bindings->application_data.value = NULL;
97 input_chan_bindings->application_data.length = 0;
105 OM_uint32 * minor_status,
106 gss_ctx_id_t * context_handle,
107 krb5_context context,
108 const gss_channel_bindings_t input_chan_bindings,
109 enum gss_ctx_id_t_state state)
111 krb5_error_code kret;
114 *context_handle = NULL;
116 ctx = malloc(sizeof(*ctx));
118 *minor_status = ENOMEM;
119 return GSS_S_FAILURE;
121 ctx->auth_context = NULL;
129 ctx->service_keyblock = NULL;
131 krb5_data_zero(&ctx->fwd_data);
132 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 = set_addresses(context, ctx->auth_context, input_chan_bindings);
145 *minor_status = kret;
147 HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
149 krb5_auth_con_free(context, ctx->auth_context);
151 return GSS_S_BAD_BINDINGS;
155 * We need a sequence number
158 krb5_auth_con_addflags(context,
160 KRB5_AUTH_CONTEXT_DO_SEQUENCE |
161 KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED,
164 *context_handle = (gss_ctx_id_t)ctx;
166 return GSS_S_COMPLETE;
172 OM_uint32 * minor_status,
173 krb5_context context,
176 krb5_const_principal target_name,
178 OM_uint32 * time_rec,
182 krb5_error_code kret;
183 krb5_creds this_cred;
184 OM_uint32 lifetime_rec;
188 memset(&this_cred, 0, sizeof(this_cred));
189 this_cred.client = ctx->source;
190 this_cred.server = ctx->target;
192 if (time_req && time_req != GSS_C_INDEFINITE) {
195 krb5_timeofday (context, &ts);
196 this_cred.times.endtime = ts + time_req;
198 this_cred.times.endtime = 0;
201 this_cred.session.keytype = KEYTYPE_NULL;
203 kret = krb5_get_credentials(context,
209 *minor_status = kret;
210 return GSS_S_FAILURE;
213 ctx->lifetime = (*cred)->times.endtime;
215 ret = _gsskrb5_lifetime_left(minor_status, context,
216 ctx->lifetime, &lifetime_rec);
219 if (lifetime_rec == 0) {
221 return GSS_S_CONTEXT_EXPIRED;
224 if (time_rec) *time_rec = lifetime_rec;
226 return GSS_S_COMPLETE;
230 gsskrb5_initiator_ready(
231 OM_uint32 * minor_status,
233 krb5_context context)
238 OM_uint32 flags = ctx->flags;
240 krb5_free_creds(context, ctx->kcred);
243 if (ctx->more_flags & CLOSE_CCACHE)
244 krb5_cc_close(context, ctx->ccache);
247 krb5_auth_getremoteseqnumber (context, ctx->auth_context, &seq_number);
249 _gsskrb5i_is_cfx(ctx, &is_cfx);
251 ret = _gssapi_msg_order_create(minor_status,
253 _gssapi_msg_order_f(flags),
254 seq_number, 0, is_cfx);
257 ctx->state = INITIATOR_READY;
258 ctx->more_flags |= OPEN;
260 return GSS_S_COMPLETE;
264 * handle delegated creds in init-sec-context
268 do_delegation (krb5_context context,
269 krb5_auth_context ac,
272 krb5_const_principal name,
277 KDCOptions fwd_flags;
278 krb5_error_code kret;
280 memset (&creds, 0, sizeof(creds));
281 krb5_data_zero (fwd_data);
283 kret = krb5_cc_get_principal(context, ccache, &creds.client);
287 kret = krb5_build_principal(context,
289 strlen(creds.client->realm),
297 creds.times.endtime = 0;
299 memset(&fwd_flags, 0, sizeof(fwd_flags));
300 fwd_flags.forwarded = 1;
301 fwd_flags.forwardable = 1;
303 if ( /*target_name->name.name_type != KRB5_NT_SRV_HST ||*/
304 name->name.name_string.len < 2)
307 kret = krb5_get_forwarded_creds(context,
310 KDCOptions2int(fwd_flags),
311 name->name.name_string.val[1],
317 *flags &= ~GSS_C_DELEG_FLAG;
319 *flags |= GSS_C_DELEG_FLAG;
322 krb5_free_principal(context, creds.client);
324 krb5_free_principal(context, creds.server);
328 * first stage of init-sec-context
333 (OM_uint32 * minor_status,
336 krb5_context context,
337 krb5_const_principal name,
338 const gss_OID mech_type,
341 const gss_buffer_t input_token,
342 gss_OID * actual_mech_type,
343 gss_buffer_t output_token,
344 OM_uint32 * ret_flags,
348 OM_uint32 ret = GSS_S_FAILURE;
349 krb5_error_code kret;
352 OM_uint32 lifetime_rec;
354 krb5_data_zero(&outbuf);
355 krb5_data_zero(&fwd_data);
359 if (actual_mech_type)
360 *actual_mech_type = GSS_KRB5_MECHANISM;
363 kret = krb5_cc_default (context, &ctx->ccache);
365 *minor_status = kret;
369 ctx->more_flags |= CLOSE_CCACHE;
371 ctx->ccache = cred->ccache;
373 kret = krb5_cc_get_principal (context, ctx->ccache, &ctx->source);
375 *minor_status = kret;
380 kret = krb5_copy_principal (context, name, &ctx->target);
382 *minor_status = kret;
387 ret = _gss_DES3_get_mic_compat(minor_status, ctx, context);
393 * This is hideous glue for (NFS) clients that wants to limit the
394 * available enctypes to what it can support (encryption in
395 * kernel). If there is no enctypes selected for this credential,
396 * reset it to the default set of enctypes.
399 krb5_enctype *enctypes = NULL;
401 if (cred && cred->enctypes)
402 enctypes = cred->enctypes;
403 krb5_set_default_in_tkt_etypes(context, enctypes);
406 ret = gsskrb5_get_creds(minor_status,
417 ctx->lifetime = ctx->kcred->times.endtime;
419 ret = _gsskrb5_lifetime_left(minor_status,
427 if (lifetime_rec == 0) {
429 ret = GSS_S_CONTEXT_EXPIRED;
433 krb5_auth_con_setkey(context,
435 &ctx->kcred->session);
437 kret = krb5_auth_con_generatelocalsubkey(context,
439 &ctx->kcred->session);
441 *minor_status = kret;
446 return GSS_S_COMPLETE;
449 if (ctx->ccache && (ctx->more_flags & CLOSE_CCACHE))
450 krb5_cc_close(context, ctx->ccache);
459 (OM_uint32 * minor_status,
462 krb5_context context,
464 const gss_channel_bindings_t input_chan_bindings,
465 const gss_buffer_t input_token,
466 gss_OID * actual_mech_type,
467 gss_buffer_t output_token,
468 OM_uint32 * ret_flags,
472 OM_uint32 ret = GSS_S_FAILURE;
473 krb5_error_code kret;
474 krb5_flags ap_options;
477 krb5_data authenticator;
479 krb5_enctype enctype;
480 krb5_data fwd_data, timedata;
481 int32_t offset = 0, oldoffset;
483 krb5_data_zero(&outbuf);
484 krb5_data_zero(&fwd_data);
489 * If the credential doesn't have ok-as-delegate, check what local
490 * policy say about ok-as-delegate, default is FALSE that makes
491 * code ignore the KDC setting and follow what the application
492 * requested. If it is TRUE, strip of the GSS_C_DELEG_FLAG if the
493 * KDC doesn't set ok-as-delegate.
495 if (!ctx->kcred->flags.b.ok_as_delegate) {
496 krb5_boolean delegate, realm_setting;
499 realm_setting = FALSE;
501 ret = krb5_cc_get_config(context, ctx->ccache, NULL,
502 "realm-config", &data);
504 /* XXX 1 is use ok-as-delegate */
505 if (data.length > 0 && (((unsigned char *)data.data)[0]) & 1)
506 realm_setting = TRUE;
507 krb5_data_free(&data);
510 krb5_appdefault_boolean(context, "gssapi", ctx->target->realm,
511 "ok-as-delegate", realm_setting,
514 req_flags &= ~GSS_C_DELEG_FLAG;
519 if (req_flags & GSS_C_DELEG_FLAG)
520 do_delegation (context,
522 ctx->ccache, ctx->kcred, ctx->target,
525 if (req_flags & GSS_C_MUTUAL_FLAG) {
526 flags |= GSS_C_MUTUAL_FLAG;
527 ap_options |= AP_OPTS_MUTUAL_REQUIRED;
530 if (req_flags & GSS_C_REPLAY_FLAG)
531 flags |= GSS_C_REPLAY_FLAG;
532 if (req_flags & GSS_C_SEQUENCE_FLAG)
533 flags |= GSS_C_SEQUENCE_FLAG;
534 if (req_flags & GSS_C_ANON_FLAG)
536 if (req_flags & GSS_C_DCE_STYLE) {
537 /* GSS_C_DCE_STYLE implies GSS_C_MUTUAL_FLAG */
538 flags |= GSS_C_DCE_STYLE | GSS_C_MUTUAL_FLAG;
539 ap_options |= AP_OPTS_MUTUAL_REQUIRED;
541 if (req_flags & GSS_C_IDENTIFY_FLAG)
542 flags |= GSS_C_IDENTIFY_FLAG;
543 if (req_flags & GSS_C_EXTENDED_ERROR_FLAG)
544 flags |= GSS_C_EXTENDED_ERROR_FLAG;
546 if (req_flags & GSS_C_CONF_FLAG) {
547 flags |= GSS_C_CONF_FLAG;
549 if (req_flags & GSS_C_INTEG_FLAG) {
550 flags |= GSS_C_INTEG_FLAG;
552 if (cred == NULL || !(cred->cred_flags & GSS_CF_NO_CI_FLAGS)) {
553 flags |= GSS_C_CONF_FLAG;
554 flags |= GSS_C_INTEG_FLAG;
556 flags |= GSS_C_TRANS_FLAG;
561 ctx->more_flags |= LOCAL;
563 ret = _gsskrb5_create_8003_checksum (minor_status,
568 krb5_data_free (&fwd_data);
572 enctype = ctx->auth_context->keyblock->keytype;
574 ret = krb5_cc_get_config(context, ctx->ccache, ctx->target,
575 "time-offset", &timedata);
577 if (timedata.length == 4) {
578 const u_char *p = timedata.data;
579 offset = (p[0] <<24) | (p[1] << 16) | (p[2] << 8) | (p[3] << 0);
581 krb5_data_free(&timedata);
585 krb5_get_kdc_sec_offset (context, &oldoffset, NULL);
586 krb5_set_kdc_sec_offset (context, offset, -1);
589 kret = krb5_build_authenticator (context,
596 KRB5_KU_AP_REQ_AUTH);
600 krb5_set_kdc_sec_offset (context, oldoffset, -1);
601 *minor_status = kret;
606 kret = krb5_build_ap_req (context,
613 krb5_set_kdc_sec_offset (context, oldoffset, -1);
615 *minor_status = kret;
620 if (flags & GSS_C_DCE_STYLE) {
621 output_token->value = outbuf.data;
622 output_token->length = outbuf.length;
624 ret = _gsskrb5_encapsulate (minor_status, &outbuf, output_token,
625 (u_char *)"\x01\x00", GSS_KRB5_MECHANISM);
626 krb5_data_free (&outbuf);
631 free_Checksum(&cksum);
633 if (flags & GSS_C_MUTUAL_FLAG) {
634 ctx->state = INITIATOR_WAIT_FOR_MUTAL;
635 return GSS_S_CONTINUE_NEEDED;
638 return gsskrb5_initiator_ready(minor_status, ctx, context);
640 if (ctx->ccache && (ctx->more_flags & CLOSE_CCACHE))
641 krb5_cc_close(context, ctx->ccache);
650 (OM_uint32 * minor_status,
652 krb5_context context,
653 const gss_OID mech_type,
656 const gss_channel_bindings_t input_chan_bindings,
657 const gss_buffer_t input_token,
658 gss_OID * actual_mech_type,
659 gss_buffer_t output_token,
660 OM_uint32 * ret_flags,
665 krb5_error_code kret;
667 krb5_ap_rep_enc_part *repl;
670 output_token->length = 0;
671 output_token->value = NULL;
673 if (actual_mech_type)
674 *actual_mech_type = GSS_KRB5_MECHANISM;
676 if (ctx->flags & GSS_C_DCE_STYLE) {
677 /* There is no OID wrapping. */
678 indata.length = input_token->length;
679 indata.data = input_token->value;
681 ret = _gsskrb5_decapsulate (minor_status,
686 if (ret == GSS_S_DEFECTIVE_TOKEN) {
687 /* check if there is an error token sent instead */
688 ret = _gsskrb5_decapsulate (minor_status,
693 if (ret == GSS_S_COMPLETE) {
696 kret = krb5_rd_error(context, &indata, &error);
698 kret = krb5_error_from_rd_error(context, &error, NULL);
700 /* save the time skrew for this host */
701 if (kret == KRB5KRB_AP_ERR_SKEW) {
704 int32_t t = error.stime - time(NULL);
706 p[0] = (t >> 24) & 0xFF;
707 p[1] = (t >> 16) & 0xFF;
708 p[2] = (t >> 8) & 0xFF;
709 p[3] = (t >> 0) & 0xFF;
712 timedata.length = sizeof(p);
714 krb5_cc_set_config(context, ctx->ccache, ctx->target,
715 "time-offset", &timedata);
717 if ((ctx->more_flags & RETRIED) == 0)
718 ctx->state = INITIATOR_RESTART;
719 ctx->more_flags |= RETRIED;
721 free_KRB_ERROR (&error);
723 *minor_status = kret;
724 return GSS_S_FAILURE;
730 kret = krb5_rd_rep (context,
735 *minor_status = kret;
736 return GSS_S_FAILURE;
738 krb5_free_ap_rep_enc_part (context,
741 _gsskrb5i_is_cfx(ctx, &is_cfx);
743 krb5_keyblock *key = NULL;
745 kret = krb5_auth_con_getremotesubkey(context,
748 if (kret == 0 && key != NULL) {
749 ctx->more_flags |= ACCEPTOR_SUBKEY;
750 krb5_free_keyblock (context, key);
757 ret = _gsskrb5_lifetime_left(minor_status,
762 ret = GSS_S_COMPLETE;
765 *ret_flags = ctx->flags;
767 if (req_flags & GSS_C_DCE_STYLE) {
768 int32_t local_seq, remote_seq;
772 * So DCE_STYLE is strange. The client echos the seq number
773 * that the server used in the server's mk_rep in its own
774 * mk_rep(). After when done, it resets to it's own seq number
775 * for the gss_wrap calls.
778 krb5_auth_getremoteseqnumber(context, ctx->auth_context, &remote_seq);
779 krb5_auth_con_getlocalseqnumber(context, ctx->auth_context, &local_seq);
780 krb5_auth_con_setlocalseqnumber(context, ctx->auth_context, remote_seq);
782 kret = krb5_mk_rep(context, ctx->auth_context, &outbuf);
784 *minor_status = kret;
785 return GSS_S_FAILURE;
788 /* reset local seq number */
789 krb5_auth_con_setlocalseqnumber(context, ctx->auth_context, local_seq);
791 output_token->length = outbuf.length;
792 output_token->value = outbuf.data;
795 return gsskrb5_initiator_ready(minor_status, ctx, context);
799 * gss_init_sec_context
802 OM_uint32 _gsskrb5_init_sec_context
803 (OM_uint32 * minor_status,
804 const gss_cred_id_t cred_handle,
805 gss_ctx_id_t * context_handle,
806 const gss_name_t target_name,
807 const gss_OID mech_type,
810 const gss_channel_bindings_t input_chan_bindings,
811 const gss_buffer_t input_token,
812 gss_OID * actual_mech_type,
813 gss_buffer_t output_token,
814 OM_uint32 * ret_flags,
818 krb5_context context;
819 gsskrb5_cred cred = (gsskrb5_cred)cred_handle;
820 krb5_const_principal name = (krb5_const_principal)target_name;
824 GSSAPI_KRB5_INIT (&context);
826 output_token->length = 0;
827 output_token->value = NULL;
829 if (context_handle == NULL) {
831 return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
839 if (target_name == GSS_C_NO_NAME) {
840 if (actual_mech_type)
841 *actual_mech_type = GSS_C_NO_OID;
843 return GSS_S_BAD_NAME;
846 if (mech_type != GSS_C_NO_OID &&
847 !gss_oid_equal(mech_type, GSS_KRB5_MECHANISM))
848 return GSS_S_BAD_MECH;
850 if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
853 if (*context_handle != GSS_C_NO_CONTEXT) {
855 return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
858 ret = _gsskrb5_create_ctx(minor_status,
867 if (*context_handle == GSS_C_NO_CONTEXT) {
869 return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
872 ctx = (gsskrb5_ctx) *context_handle;
874 HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
877 switch (ctx->state) {
878 case INITIATOR_START:
879 ret = init_auth(minor_status,
892 if (ret != GSS_S_COMPLETE)
895 case INITIATOR_RESTART:
896 ret = init_auth_restart(minor_status,
908 case INITIATOR_WAIT_FOR_MUTAL:
909 ret = repl_mutual(minor_status,
921 if (ctx->state == INITIATOR_RESTART)
924 case INITIATOR_READY:
926 * If we get there, the caller have called
927 * gss_init_sec_context() one time too many.
930 ret = GSS_S_BAD_STATUS;
934 ret = GSS_S_BAD_STATUS;
937 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
939 /* destroy context in case of error */
940 if (GSS_ERROR(ret)) {
942 _gsskrb5_delete_sec_context(&min2, context_handle, GSS_C_NO_BUFFER);