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
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 "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
;
127 ctx
->service_keyblock
= NULL
;
129 krb5_data_zero(&ctx
->fwd_data
);
130 ctx
->lifetime
= GSS_C_INDEFINITE
;
133 HEIMDAL_MUTEX_init(&ctx
->ctx_id_mutex
);
135 kret
= krb5_auth_con_init (context
, &ctx
->auth_context
);
137 *minor_status
= kret
;
138 HEIMDAL_MUTEX_destroy(&ctx
->ctx_id_mutex
);
139 return GSS_S_FAILURE
;
142 kret
= set_addresses(context
, ctx
->auth_context
, input_chan_bindings
);
144 *minor_status
= kret
;
146 HEIMDAL_MUTEX_destroy(&ctx
->ctx_id_mutex
);
148 krb5_auth_con_free(context
, ctx
->auth_context
);
150 return GSS_S_BAD_BINDINGS
;
154 * We need a sequence number
157 krb5_auth_con_addflags(context
,
159 KRB5_AUTH_CONTEXT_DO_SEQUENCE
|
160 KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED
,
163 *context_handle
= (gss_ctx_id_t
)ctx
;
165 return GSS_S_COMPLETE
;
171 OM_uint32
* minor_status
,
172 krb5_context context
,
175 const gss_name_t target_name
,
178 OM_uint32
* time_rec
,
182 krb5_error_code kret
;
183 krb5_creds this_cred
;
184 OM_uint32 lifetime_rec
;
189 krb5_free_principal(context
, ctx
->target
);
193 ret
= _gsskrb5_canon_name(minor_status
, context
, use_dns
,
194 target_name
, &ctx
->target
);
198 memset(&this_cred
, 0, sizeof(this_cred
));
199 this_cred
.client
= ctx
->source
;
200 this_cred
.server
= ctx
->target
;
202 if (time_req
&& time_req
!= GSS_C_INDEFINITE
) {
205 krb5_timeofday (context
, &ts
);
206 this_cred
.times
.endtime
= ts
+ time_req
;
208 this_cred
.times
.endtime
= 0;
211 this_cred
.session
.keytype
= KEYTYPE_NULL
;
213 kret
= krb5_get_credentials(context
,
219 *minor_status
= kret
;
220 return GSS_S_FAILURE
;
223 ctx
->lifetime
= (*cred
)->times
.endtime
;
225 ret
= _gsskrb5_lifetime_left(minor_status
, context
,
226 ctx
->lifetime
, &lifetime_rec
);
229 if (lifetime_rec
== 0) {
231 return GSS_S_CONTEXT_EXPIRED
;
234 if (time_rec
) *time_rec
= lifetime_rec
;
236 return GSS_S_COMPLETE
;
240 gsskrb5_initiator_ready(
241 OM_uint32
* minor_status
,
243 krb5_context context
)
248 OM_uint32 flags
= ctx
->flags
;
250 krb5_free_creds(context
, ctx
->kcred
);
253 if (ctx
->more_flags
& CLOSE_CCACHE
)
254 krb5_cc_close(context
, ctx
->ccache
);
257 krb5_auth_getremoteseqnumber (context
, ctx
->auth_context
, &seq_number
);
259 _gsskrb5i_is_cfx(context
, ctx
, 0);
260 is_cfx
= (ctx
->more_flags
& IS_CFX
);
262 ret
= _gssapi_msg_order_create(minor_status
,
264 _gssapi_msg_order_f(flags
),
265 seq_number
, 0, is_cfx
);
268 ctx
->state
= INITIATOR_READY
;
269 ctx
->more_flags
|= OPEN
;
271 return GSS_S_COMPLETE
;
275 * handle delegated creds in init-sec-context
279 do_delegation (krb5_context context
,
280 krb5_auth_context ac
,
283 krb5_const_principal name
,
289 KDCOptions fwd_flags
;
290 krb5_error_code kret
;
292 memset (&creds
, 0, sizeof(creds
));
293 krb5_data_zero (fwd_data
);
295 kret
= krb5_cc_get_principal(context
, ccache
, &creds
.client
);
299 kret
= krb5_build_principal(context
,
301 strlen(creds
.client
->realm
),
309 creds
.times
.endtime
= 0;
311 memset(&fwd_flags
, 0, sizeof(fwd_flags
));
312 fwd_flags
.forwarded
= 1;
313 fwd_flags
.forwardable
= 1;
315 if ( /*target_name->name.name_type != KRB5_NT_SRV_HST ||*/
316 name
->name
.name_string
.len
< 2)
319 kret
= krb5_get_forwarded_creds(context
,
322 KDCOptions2int(fwd_flags
),
323 name
->name
.name_string
.val
[1],
334 krb5_free_principal(context
, creds
.client
);
336 krb5_free_principal(context
, creds
.server
);
340 * first stage of init-sec-context
345 (OM_uint32
* minor_status
,
348 krb5_context context
,
350 const gss_OID mech_type
,
353 const gss_buffer_t input_token
,
354 gss_OID
* actual_mech_type
,
355 gss_buffer_t output_token
,
356 OM_uint32
* ret_flags
,
360 OM_uint32 ret
= GSS_S_FAILURE
;
361 krb5_error_code kret
;
364 OM_uint32 lifetime_rec
;
367 krb5_data_zero(&outbuf
);
368 krb5_data_zero(&fwd_data
);
372 if (actual_mech_type
)
373 *actual_mech_type
= GSS_KRB5_MECHANISM
;
376 kret
= krb5_cc_default (context
, &ctx
->ccache
);
378 *minor_status
= kret
;
382 ctx
->more_flags
|= CLOSE_CCACHE
;
384 ctx
->ccache
= cred
->ccache
;
386 kret
= krb5_cc_get_principal (context
, ctx
->ccache
, &ctx
->source
);
388 *minor_status
= kret
;
393 ret
= _gss_DES3_get_mic_compat(minor_status
, ctx
, context
);
399 * This is hideous glue for (NFS) clients that wants to limit the
400 * available enctypes to what it can support (encryption in
401 * kernel). If there is no enctypes selected for this credential,
402 * reset it to the default set of enctypes.
405 krb5_enctype
*enctypes
= NULL
;
407 if (cred
&& cred
->enctypes
)
408 enctypes
= cred
->enctypes
;
409 krb5_set_default_in_tkt_etypes(context
, enctypes
);
412 /* canon name if needed for client + target realm */
413 kret
= krb5_cc_get_config(context
, ctx
->ccache
, NULL
,
414 "realm-config", &outbuf
);
416 /* XXX 2 is no server canon */
417 if (outbuf
.length
< 1 || ((((unsigned char *)outbuf
.data
)[0]) & 2))
419 krb5_data_free(&outbuf
);
423 * First we try w/o dns, hope that the KDC have register alias
424 * (and referrals if cross realm) for this principal. If that
425 * fails and if we are allowed to using this realm try again with
426 * DNS canonicalizion.
428 ret
= gsskrb5_get_creds(minor_status
, context
, ctx
->ccache
,
429 ctx
, name
, 0, time_req
,
430 time_rec
, &ctx
->kcred
);
431 if (ret
&& allow_dns
)
432 ret
= gsskrb5_get_creds(minor_status
, context
, ctx
->ccache
,
433 ctx
, name
, 1, time_req
,
434 time_rec
, &ctx
->kcred
);
438 ctx
->lifetime
= ctx
->kcred
->times
.endtime
;
440 ret
= _gsskrb5_lifetime_left(minor_status
,
447 if (lifetime_rec
== 0) {
449 ret
= GSS_S_CONTEXT_EXPIRED
;
453 krb5_auth_con_setkey(context
,
455 &ctx
->kcred
->session
);
457 kret
= krb5_auth_con_generatelocalsubkey(context
,
459 &ctx
->kcred
->session
);
461 *minor_status
= kret
;
466 return GSS_S_COMPLETE
;
469 if (ctx
->ccache
&& (ctx
->more_flags
& CLOSE_CCACHE
))
470 krb5_cc_close(context
, ctx
->ccache
);
479 (OM_uint32
* minor_status
,
482 krb5_context context
,
484 const gss_channel_bindings_t input_chan_bindings
,
485 const gss_buffer_t input_token
,
486 gss_OID
* actual_mech_type
,
487 gss_buffer_t output_token
,
488 OM_uint32
* ret_flags
,
492 OM_uint32 ret
= GSS_S_FAILURE
;
493 krb5_error_code kret
;
494 krb5_flags ap_options
;
497 krb5_data authenticator
;
499 krb5_enctype enctype
;
500 krb5_data fwd_data
, timedata
;
501 int32_t offset
= 0, oldoffset
;
504 krb5_data_zero(&outbuf
);
505 krb5_data_zero(&fwd_data
);
510 * If the credential doesn't have ok-as-delegate, check if there
511 * is a realm setting and use that.
513 if (!ctx
->kcred
->flags
.b
.ok_as_delegate
) {
516 ret
= krb5_cc_get_config(context
, ctx
->ccache
, NULL
,
517 "realm-config", &data
);
519 /* XXX 1 is use ok-as-delegate */
520 if (data
.length
< 1 || ((((unsigned char *)data
.data
)[0]) & 1) == 0)
521 req_flags
&= ~(GSS_C_DELEG_FLAG
|GSS_C_DELEG_POLICY_FLAG
);
522 krb5_data_free(&data
);
528 /* if we used GSS_C_DELEG_POLICY_FLAG, trust KDC */
529 if ((req_flags
& GSS_C_DELEG_POLICY_FLAG
)
530 && ctx
->kcred
->flags
.b
.ok_as_delegate
)
531 flagmask
|= GSS_C_DELEG_FLAG
| GSS_C_DELEG_POLICY_FLAG
;
532 /* if there still is a GSS_C_DELEG_FLAG, use that */
533 if (req_flags
& GSS_C_DELEG_FLAG
)
534 flagmask
|= GSS_C_DELEG_FLAG
;
539 if (flagmask
& GSS_C_DELEG_FLAG
) {
540 do_delegation (context
,
542 ctx
->ccache
, ctx
->kcred
, ctx
->target
,
543 &fwd_data
, flagmask
, &flags
);
546 if (req_flags
& GSS_C_MUTUAL_FLAG
) {
547 flags
|= GSS_C_MUTUAL_FLAG
;
548 ap_options
|= AP_OPTS_MUTUAL_REQUIRED
;
551 if (req_flags
& GSS_C_REPLAY_FLAG
)
552 flags
|= GSS_C_REPLAY_FLAG
;
553 if (req_flags
& GSS_C_SEQUENCE_FLAG
)
554 flags
|= GSS_C_SEQUENCE_FLAG
;
556 if (req_flags
& GSS_C_ANON_FLAG
)
559 if (req_flags
& GSS_C_DCE_STYLE
) {
560 /* GSS_C_DCE_STYLE implies GSS_C_MUTUAL_FLAG */
561 flags
|= GSS_C_DCE_STYLE
| GSS_C_MUTUAL_FLAG
;
562 ap_options
|= AP_OPTS_MUTUAL_REQUIRED
;
564 if (req_flags
& GSS_C_IDENTIFY_FLAG
)
565 flags
|= GSS_C_IDENTIFY_FLAG
;
566 if (req_flags
& GSS_C_EXTENDED_ERROR_FLAG
)
567 flags
|= GSS_C_EXTENDED_ERROR_FLAG
;
569 if (req_flags
& GSS_C_CONF_FLAG
) {
570 flags
|= GSS_C_CONF_FLAG
;
572 if (req_flags
& GSS_C_INTEG_FLAG
) {
573 flags
|= GSS_C_INTEG_FLAG
;
575 if (cred
== NULL
|| !(cred
->cred_flags
& GSS_CF_NO_CI_FLAGS
)) {
576 flags
|= GSS_C_CONF_FLAG
;
577 flags
|= GSS_C_INTEG_FLAG
;
579 flags
|= GSS_C_TRANS_FLAG
;
584 ctx
->more_flags
|= LOCAL
;
586 ret
= _gsskrb5_create_8003_checksum (minor_status
,
591 krb5_data_free (&fwd_data
);
595 enctype
= ctx
->auth_context
->keyblock
->keytype
;
597 ret
= krb5_cc_get_config(context
, ctx
->ccache
, ctx
->target
,
598 "time-offset", &timedata
);
600 if (timedata
.length
== 4) {
601 const u_char
*p
= timedata
.data
;
602 offset
= (p
[0] <<24) | (p
[1] << 16) | (p
[2] << 8) | (p
[3] << 0);
604 krb5_data_free(&timedata
);
608 krb5_get_kdc_sec_offset (context
, &oldoffset
, NULL
);
609 krb5_set_kdc_sec_offset (context
, offset
, -1);
612 kret
= krb5_build_authenticator (context
,
619 KRB5_KU_AP_REQ_AUTH
);
623 krb5_set_kdc_sec_offset (context
, oldoffset
, -1);
624 *minor_status
= kret
;
629 kret
= krb5_build_ap_req (context
,
636 krb5_set_kdc_sec_offset (context
, oldoffset
, -1);
638 *minor_status
= kret
;
643 if (flags
& GSS_C_DCE_STYLE
) {
644 output_token
->value
= outbuf
.data
;
645 output_token
->length
= outbuf
.length
;
647 ret
= _gsskrb5_encapsulate (minor_status
, &outbuf
, output_token
,
648 (u_char
*)"\x01\x00", GSS_KRB5_MECHANISM
);
649 krb5_data_free (&outbuf
);
654 free_Checksum(&cksum
);
656 if (flags
& GSS_C_MUTUAL_FLAG
) {
657 ctx
->state
= INITIATOR_WAIT_FOR_MUTAL
;
658 return GSS_S_CONTINUE_NEEDED
;
661 return gsskrb5_initiator_ready(minor_status
, ctx
, context
);
663 if (ctx
->ccache
&& (ctx
->more_flags
& CLOSE_CCACHE
))
664 krb5_cc_close(context
, ctx
->ccache
);
673 (OM_uint32
* minor_status
,
675 krb5_context context
,
676 const gss_OID mech_type
,
679 const gss_channel_bindings_t input_chan_bindings
,
680 const gss_buffer_t input_token
,
681 gss_OID
* actual_mech_type
,
682 gss_buffer_t output_token
,
683 OM_uint32
* ret_flags
,
688 krb5_error_code kret
;
690 krb5_ap_rep_enc_part
*repl
;
692 output_token
->length
= 0;
693 output_token
->value
= NULL
;
695 if (actual_mech_type
)
696 *actual_mech_type
= GSS_KRB5_MECHANISM
;
698 if (IS_DCE_STYLE(ctx
)) {
699 /* There is no OID wrapping. */
700 indata
.length
= input_token
->length
;
701 indata
.data
= input_token
->value
;
703 ret
= _gsskrb5_decapsulate (minor_status
,
708 if (ret
== GSS_S_DEFECTIVE_TOKEN
) {
709 /* check if there is an error token sent instead */
710 ret
= _gsskrb5_decapsulate (minor_status
,
715 if (ret
== GSS_S_COMPLETE
) {
718 kret
= krb5_rd_error(context
, &indata
, &error
);
720 kret
= krb5_error_from_rd_error(context
, &error
, NULL
);
722 /* save the time skrew for this host */
723 if (kret
== KRB5KRB_AP_ERR_SKEW
) {
726 int32_t t
= error
.stime
- time(NULL
);
728 p
[0] = (t
>> 24) & 0xFF;
729 p
[1] = (t
>> 16) & 0xFF;
730 p
[2] = (t
>> 8) & 0xFF;
731 p
[3] = (t
>> 0) & 0xFF;
734 timedata
.length
= sizeof(p
);
736 krb5_cc_set_config(context
, ctx
->ccache
, ctx
->target
,
737 "time-offset", &timedata
);
739 if ((ctx
->more_flags
& RETRIED
) == 0)
740 ctx
->state
= INITIATOR_RESTART
;
741 ctx
->more_flags
|= RETRIED
;
743 free_KRB_ERROR (&error
);
745 *minor_status
= kret
;
746 return GSS_S_FAILURE
;
752 kret
= krb5_rd_rep (context
,
757 *minor_status
= kret
;
758 return GSS_S_FAILURE
;
760 krb5_free_ap_rep_enc_part (context
,
765 ret
= _gsskrb5_lifetime_left(minor_status
,
770 ret
= GSS_S_COMPLETE
;
773 *ret_flags
= ctx
->flags
;
775 if (req_flags
& GSS_C_DCE_STYLE
) {
776 int32_t local_seq
, remote_seq
;
780 * So DCE_STYLE is strange. The client echos the seq number
781 * that the server used in the server's mk_rep in its own
782 * mk_rep(). After when done, it resets to it's own seq number
783 * for the gss_wrap calls.
786 krb5_auth_getremoteseqnumber(context
, ctx
->auth_context
, &remote_seq
);
787 krb5_auth_con_getlocalseqnumber(context
, ctx
->auth_context
, &local_seq
);
788 krb5_auth_con_setlocalseqnumber(context
, ctx
->auth_context
, remote_seq
);
790 kret
= krb5_mk_rep(context
, ctx
->auth_context
, &outbuf
);
792 *minor_status
= kret
;
793 return GSS_S_FAILURE
;
796 /* reset local seq number */
797 krb5_auth_con_setlocalseqnumber(context
, ctx
->auth_context
, local_seq
);
799 output_token
->length
= outbuf
.length
;
800 output_token
->value
= outbuf
.data
;
803 return gsskrb5_initiator_ready(minor_status
, ctx
, context
);
807 * gss_init_sec_context
810 OM_uint32 _gsskrb5_init_sec_context
811 (OM_uint32
* minor_status
,
812 const gss_cred_id_t cred_handle
,
813 gss_ctx_id_t
* context_handle
,
814 const gss_name_t target_name
,
815 const gss_OID mech_type
,
818 const gss_channel_bindings_t input_chan_bindings
,
819 const gss_buffer_t input_token
,
820 gss_OID
* actual_mech_type
,
821 gss_buffer_t output_token
,
822 OM_uint32
* ret_flags
,
826 krb5_context context
;
827 gsskrb5_cred cred
= (gsskrb5_cred
)cred_handle
;
831 GSSAPI_KRB5_INIT (&context
);
833 output_token
->length
= 0;
834 output_token
->value
= NULL
;
836 if (context_handle
== NULL
) {
838 return GSS_S_FAILURE
| GSS_S_CALL_BAD_STRUCTURE
;
846 if (target_name
== GSS_C_NO_NAME
) {
847 if (actual_mech_type
)
848 *actual_mech_type
= GSS_C_NO_OID
;
850 return GSS_S_BAD_NAME
;
853 if (mech_type
!= GSS_C_NO_OID
&&
854 !gss_oid_equal(mech_type
, GSS_KRB5_MECHANISM
))
855 return GSS_S_BAD_MECH
;
857 if (input_token
== GSS_C_NO_BUFFER
|| input_token
->length
== 0) {
860 if (*context_handle
!= GSS_C_NO_CONTEXT
) {
862 return GSS_S_FAILURE
| GSS_S_CALL_BAD_STRUCTURE
;
865 ret
= _gsskrb5_create_ctx(minor_status
,
874 if (*context_handle
== GSS_C_NO_CONTEXT
) {
876 return GSS_S_FAILURE
| GSS_S_CALL_BAD_STRUCTURE
;
879 ctx
= (gsskrb5_ctx
) *context_handle
;
881 HEIMDAL_MUTEX_lock(&ctx
->ctx_id_mutex
);
884 switch (ctx
->state
) {
885 case INITIATOR_START
:
886 ret
= init_auth(minor_status
,
899 if (ret
!= GSS_S_COMPLETE
)
902 case INITIATOR_RESTART
:
903 ret
= init_auth_restart(minor_status
,
915 case INITIATOR_WAIT_FOR_MUTAL
:
916 ret
= repl_mutual(minor_status
,
928 if (ctx
->state
== INITIATOR_RESTART
)
931 case INITIATOR_READY
:
933 * If we get there, the caller have called
934 * gss_init_sec_context() one time too many.
936 _gsskrb5_set_status(EINVAL
, "init_sec_context "
937 "called one time too many");
938 *minor_status
= EINVAL
;
939 ret
= GSS_S_BAD_STATUS
;
942 _gsskrb5_set_status(EINVAL
, "init_sec_context "
943 "invalid state %d for client",
945 *minor_status
= EINVAL
;
946 ret
= GSS_S_BAD_STATUS
;
949 HEIMDAL_MUTEX_unlock(&ctx
->ctx_id_mutex
);
951 /* destroy context in case of error */
952 if (GSS_ERROR(ret
)) {
954 _gsskrb5_delete_sec_context(&min2
, context_handle
, GSS_C_NO_BUFFER
);