2 Unix SMB/CIFS implementation.
4 Kerberos backend for GENSEC
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
7 Copyright (C) Andrew Tridgell 2001
8 Copyright (C) Luke Howard 2002-2003
9 Copyright (C) Stefan Metzmacher 2004-2005
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program. If not, see <http://www.gnu.org/licenses/>.
27 #include "system/kerberos.h"
28 #include "auth/kerberos/kerberos.h"
29 #include "auth/auth.h"
30 #include "lib/socket/socket.h"
31 #include "lib/tsocket/tsocket.h"
32 #include "librpc/rpc/dcerpc.h"
33 #include "auth/credentials/credentials.h"
34 #include "auth/credentials/credentials_krb5.h"
35 #include "auth/kerberos/kerberos_credentials.h"
36 #include "auth/gensec/gensec.h"
37 #include "auth/gensec/gensec_proto.h"
38 #include "auth/gensec/gensec_toplevel_proto.h"
39 #include "param/param.h"
40 #include "auth/auth_sam_reply.h"
41 #include "lib/util/util_net.h"
43 _PUBLIC_ NTSTATUS
gensec_krb5_init(void);
45 enum GENSEC_KRB5_STATE
{
46 GENSEC_KRB5_SERVER_START
,
47 GENSEC_KRB5_CLIENT_START
,
48 GENSEC_KRB5_CLIENT_MUTUAL_AUTH
,
52 struct gensec_krb5_state
{
53 enum GENSEC_KRB5_STATE state_position
;
54 struct smb_krb5_context
*smb_krb5_context
;
55 krb5_auth_context auth_context
;
57 krb5_keyblock
*keyblock
;
60 krb5_flags ap_req_options
;
63 static int gensec_krb5_destroy(struct gensec_krb5_state
*gensec_krb5_state
)
65 if (!gensec_krb5_state
->smb_krb5_context
) {
66 /* We can't clean anything else up unless we started up this far */
69 if (gensec_krb5_state
->enc_ticket
.length
) {
70 kerberos_free_data_contents(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
71 &gensec_krb5_state
->enc_ticket
);
74 if (gensec_krb5_state
->ticket
) {
75 krb5_free_ticket(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
76 gensec_krb5_state
->ticket
);
79 /* ccache freed in a child destructor */
81 krb5_free_keyblock(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
82 gensec_krb5_state
->keyblock
);
84 if (gensec_krb5_state
->auth_context
) {
85 krb5_auth_con_free(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
86 gensec_krb5_state
->auth_context
);
92 static NTSTATUS
gensec_krb5_start(struct gensec_security
*gensec_security
, bool gssapi
)
95 struct gensec_krb5_state
*gensec_krb5_state
;
96 struct cli_credentials
*creds
;
97 const struct tsocket_address
*tlocal_addr
, *tremote_addr
;
98 krb5_address my_krb5_addr
, peer_krb5_addr
;
100 creds
= gensec_get_credentials(gensec_security
);
102 return NT_STATUS_INVALID_PARAMETER
;
105 gensec_krb5_state
= talloc(gensec_security
, struct gensec_krb5_state
);
106 if (!gensec_krb5_state
) {
107 return NT_STATUS_NO_MEMORY
;
110 gensec_security
->private_data
= gensec_krb5_state
;
111 gensec_krb5_state
->smb_krb5_context
= NULL
;
112 gensec_krb5_state
->auth_context
= NULL
;
113 gensec_krb5_state
->ticket
= NULL
;
114 ZERO_STRUCT(gensec_krb5_state
->enc_ticket
);
115 gensec_krb5_state
->keyblock
= NULL
;
116 gensec_krb5_state
->gssapi
= gssapi
;
118 talloc_set_destructor(gensec_krb5_state
, gensec_krb5_destroy
);
120 if (cli_credentials_get_krb5_context(creds
,
121 gensec_security
->settings
->lp_ctx
, &gensec_krb5_state
->smb_krb5_context
)) {
122 talloc_free(gensec_krb5_state
);
123 return NT_STATUS_INTERNAL_ERROR
;
126 ret
= krb5_auth_con_init(gensec_krb5_state
->smb_krb5_context
->krb5_context
, &gensec_krb5_state
->auth_context
);
128 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
129 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
130 ret
, gensec_krb5_state
)));
131 talloc_free(gensec_krb5_state
);
132 return NT_STATUS_INTERNAL_ERROR
;
135 ret
= krb5_auth_con_setflags(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
136 gensec_krb5_state
->auth_context
,
137 KRB5_AUTH_CONTEXT_DO_SEQUENCE
);
139 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
140 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
141 ret
, gensec_krb5_state
)));
142 talloc_free(gensec_krb5_state
);
143 return NT_STATUS_INTERNAL_ERROR
;
146 tlocal_addr
= gensec_get_local_address(gensec_security
);
149 struct sockaddr_storage ss
;
151 socklen
= tsocket_address_bsd_sockaddr(tlocal_addr
,
152 (struct sockaddr
*) &ss
,
153 sizeof(struct sockaddr_storage
));
155 talloc_free(gensec_krb5_state
);
156 return NT_STATUS_INTERNAL_ERROR
;
158 ret
= krb5_sockaddr2address(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
159 (const struct sockaddr
*) &ss
, &my_krb5_addr
);
161 DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
162 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
163 ret
, gensec_krb5_state
)));
164 talloc_free(gensec_krb5_state
);
165 return NT_STATUS_INTERNAL_ERROR
;
169 tremote_addr
= gensec_get_remote_address(gensec_security
);
172 struct sockaddr_storage ss
;
174 socklen
= tsocket_address_bsd_sockaddr(tremote_addr
,
175 (struct sockaddr
*) &ss
,
176 sizeof(struct sockaddr_storage
));
178 talloc_free(gensec_krb5_state
);
179 return NT_STATUS_INTERNAL_ERROR
;
181 ret
= krb5_sockaddr2address(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
182 (const struct sockaddr
*) &ss
, &peer_krb5_addr
);
184 DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
185 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
186 ret
, gensec_krb5_state
)));
187 talloc_free(gensec_krb5_state
);
188 return NT_STATUS_INTERNAL_ERROR
;
192 ret
= krb5_auth_con_setaddrs(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
193 gensec_krb5_state
->auth_context
,
194 tlocal_addr
? &my_krb5_addr
: NULL
,
195 tremote_addr
? &peer_krb5_addr
: NULL
);
197 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
198 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
199 ret
, gensec_krb5_state
)));
200 talloc_free(gensec_krb5_state
);
201 return NT_STATUS_INTERNAL_ERROR
;
207 static NTSTATUS
gensec_krb5_common_server_start(struct gensec_security
*gensec_security
, bool gssapi
)
210 struct gensec_krb5_state
*gensec_krb5_state
;
212 nt_status
= gensec_krb5_start(gensec_security
, gssapi
);
213 if (!NT_STATUS_IS_OK(nt_status
)) {
217 gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
218 gensec_krb5_state
->state_position
= GENSEC_KRB5_SERVER_START
;
223 static NTSTATUS
gensec_krb5_server_start(struct gensec_security
*gensec_security
)
225 return gensec_krb5_common_server_start(gensec_security
, false);
228 static NTSTATUS
gensec_fake_gssapi_krb5_server_start(struct gensec_security
*gensec_security
)
230 return gensec_krb5_common_server_start(gensec_security
, true);
233 static NTSTATUS
gensec_krb5_common_client_start(struct gensec_security
*gensec_security
, bool gssapi
)
235 const char *hostname
;
236 struct gensec_krb5_state
*gensec_krb5_state
;
238 hostname
= gensec_get_target_hostname(gensec_security
);
240 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
241 return NT_STATUS_INVALID_PARAMETER
;
243 if (is_ipaddress(hostname
)) {
244 DEBUG(2, ("Cannot do krb5 to an IP address"));
245 return NT_STATUS_INVALID_PARAMETER
;
247 if (strcmp(hostname
, "localhost") == 0) {
248 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
249 return NT_STATUS_INVALID_PARAMETER
;
252 nt_status
= gensec_krb5_start(gensec_security
, gssapi
);
253 if (!NT_STATUS_IS_OK(nt_status
)) {
257 gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
258 gensec_krb5_state
->state_position
= GENSEC_KRB5_CLIENT_START
;
259 gensec_krb5_state
->ap_req_options
= AP_OPTS_USE_SUBKEY
;
261 if (gensec_krb5_state
->gssapi
) {
262 /* The Fake GSSAPI modal emulates Samba3, which does not do mutual authentication */
263 if (gensec_setting_bool(gensec_security
->settings
, "gensec_fake_gssapi_krb5", "mutual", false)) {
264 gensec_krb5_state
->ap_req_options
|= AP_OPTS_MUTUAL_REQUIRED
;
267 /* The wrapping for KPASSWD (a user of the raw KRB5 API) should be mutually authenticated */
268 if (gensec_setting_bool(gensec_security
->settings
, "gensec_krb5", "mutual", true)) {
269 gensec_krb5_state
->ap_req_options
|= AP_OPTS_MUTUAL_REQUIRED
;
275 static NTSTATUS
gensec_krb5_common_client_creds(struct gensec_security
*gensec_security
,
276 struct tevent_context
*ev
,
279 struct gensec_krb5_state
*gensec_krb5_state
;
281 struct ccache_container
*ccache_container
;
282 const char *error_string
;
283 const char *principal
;
284 const char *hostname
;
286 struct tevent_context
*previous_ev
;
288 gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
290 principal
= gensec_get_target_principal(gensec_security
);
291 hostname
= gensec_get_target_hostname(gensec_security
);
293 ret
= cli_credentials_get_ccache(gensec_get_credentials(gensec_security
),
295 gensec_security
->settings
->lp_ctx
, &ccache_container
, &error_string
);
299 case KRB5KDC_ERR_PREAUTH_FAILED
:
300 case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN
:
301 return NT_STATUS_LOGON_FAILURE
;
302 case KRB5_KDC_UNREACH
:
303 DEBUG(3, ("Cannot reach a KDC we require to contact %s: %s\n", principal
, error_string
));
304 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
305 case KRB5_CC_NOTFOUND
:
307 DEBUG(3, ("Error preparing credentials we require to contact %s : %s\n", principal
, error_string
));
308 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
310 DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_string
));
311 return NT_STATUS_UNSUCCESSFUL
;
315 /* Do this every time, in case we have weird recursive issues here */
316 ret
= smb_krb5_context_set_event_ctx(gensec_krb5_state
->smb_krb5_context
, ev
, &previous_ev
);
318 DEBUG(1, ("gensec_krb5_start: Setting event context failed\n"));
319 return NT_STATUS_NO_MEMORY
;
322 krb5_principal target_principal
;
323 ret
= krb5_parse_name(gensec_krb5_state
->smb_krb5_context
->krb5_context
, principal
,
326 ret
= krb5_mk_req_exact(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
327 &gensec_krb5_state
->auth_context
,
328 gensec_krb5_state
->ap_req_options
,
330 &in_data
, ccache_container
->ccache
,
331 &gensec_krb5_state
->enc_ticket
);
332 krb5_free_principal(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
336 ret
= krb5_mk_req(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
337 &gensec_krb5_state
->auth_context
,
338 gensec_krb5_state
->ap_req_options
,
339 gensec_get_target_service(gensec_security
),
341 &in_data
, ccache_container
->ccache
,
342 &gensec_krb5_state
->enc_ticket
);
345 smb_krb5_context_remove_event_ctx(gensec_krb5_state
->smb_krb5_context
, previous_ev
, ev
);
350 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
:
351 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
352 hostname
, smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, gensec_krb5_state
)));
353 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
354 case KRB5_KDC_UNREACH
:
355 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
356 hostname
, smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, gensec_krb5_state
)));
357 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
358 case KRB5KDC_ERR_PREAUTH_FAILED
:
359 case KRB5KRB_AP_ERR_TKT_EXPIRED
:
361 /* Too much clock skew - we will need to kinit to re-skew the clock */
362 case KRB5KRB_AP_ERR_SKEW
:
363 case KRB5_KDCREP_SKEW
:
365 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
366 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, gensec_krb5_state
)));
370 /* just don't print a message for these really ordinary messages */
371 case KRB5_FCC_NOFILE
:
372 case KRB5_CC_NOTFOUND
:
375 return NT_STATUS_UNSUCCESSFUL
;
379 DEBUG(0, ("kerberos: %s\n",
380 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, gensec_krb5_state
)));
381 return NT_STATUS_UNSUCCESSFUL
;
385 static NTSTATUS
gensec_krb5_client_start(struct gensec_security
*gensec_security
)
387 return gensec_krb5_common_client_start(gensec_security
, false);
390 static NTSTATUS
gensec_fake_gssapi_krb5_client_start(struct gensec_security
*gensec_security
)
392 return gensec_krb5_common_client_start(gensec_security
, true);
396 * Check if the packet is one for this mechansim
398 * @param gensec_security GENSEC state
399 * @param in The request, as a DATA_BLOB
400 * @return Error, INVALID_PARAMETER if it's not a packet for us
401 * or NT_STATUS_OK if the packet is ok.
404 static NTSTATUS
gensec_fake_gssapi_krb5_magic(struct gensec_security
*gensec_security
,
407 if (gensec_gssapi_check_oid(in
, GENSEC_OID_KERBEROS5
)) {
410 return NT_STATUS_INVALID_PARAMETER
;
416 * Next state function for the Krb5 GENSEC mechanism
418 * @param gensec_krb5_state KRB5 State
419 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
420 * @param in The request, as a DATA_BLOB
421 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
422 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
423 * or NT_STATUS_OK if the user is authenticated.
426 static NTSTATUS
gensec_krb5_update(struct gensec_security
*gensec_security
,
427 TALLOC_CTX
*out_mem_ctx
,
428 struct tevent_context
*ev
,
429 const DATA_BLOB in
, DATA_BLOB
*out
)
431 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
432 krb5_error_code ret
= 0;
435 switch (gensec_krb5_state
->state_position
) {
436 case GENSEC_KRB5_CLIENT_START
:
438 DATA_BLOB unwrapped_out
;
440 nt_status
= gensec_krb5_common_client_creds(gensec_security
, ev
, gensec_krb5_state
->gssapi
);
441 if (!NT_STATUS_IS_OK(nt_status
)) {
445 if (gensec_krb5_state
->gssapi
) {
446 unwrapped_out
= data_blob_talloc(out_mem_ctx
, gensec_krb5_state
->enc_ticket
.data
, gensec_krb5_state
->enc_ticket
.length
);
448 /* wrap that up in a nice GSS-API wrapping */
449 *out
= gensec_gssapi_gen_krb5_wrap(out_mem_ctx
, &unwrapped_out
, TOK_ID_KRB_AP_REQ
);
451 *out
= data_blob_talloc(out_mem_ctx
, gensec_krb5_state
->enc_ticket
.data
, gensec_krb5_state
->enc_ticket
.length
);
453 if (gensec_krb5_state
->ap_req_options
& AP_OPTS_MUTUAL_REQUIRED
) {
454 gensec_krb5_state
->state_position
= GENSEC_KRB5_CLIENT_MUTUAL_AUTH
;
455 nt_status
= NT_STATUS_MORE_PROCESSING_REQUIRED
;
457 gensec_krb5_state
->state_position
= GENSEC_KRB5_DONE
;
458 nt_status
= NT_STATUS_OK
;
463 case GENSEC_KRB5_CLIENT_MUTUAL_AUTH
:
465 DATA_BLOB unwrapped_in
;
467 krb5_ap_rep_enc_part
*repl
= NULL
;
470 if (gensec_krb5_state
->gssapi
) {
471 if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx
, &in
, &unwrapped_in
, tok_id
)) {
472 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
473 dump_data_pw("Mutual authentication message:\n", in
.data
, in
.length
);
474 return NT_STATUS_INVALID_PARAMETER
;
479 /* TODO: check the tok_id */
481 inbuf
.data
= unwrapped_in
.data
;
482 inbuf
.length
= unwrapped_in
.length
;
483 ret
= krb5_rd_rep(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
484 gensec_krb5_state
->auth_context
,
487 DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
488 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, out_mem_ctx
)));
489 dump_data_pw("Mutual authentication message:\n", (uint8_t *)inbuf
.data
, inbuf
.length
);
490 nt_status
= NT_STATUS_ACCESS_DENIED
;
492 *out
= data_blob(NULL
, 0);
493 nt_status
= NT_STATUS_OK
;
494 gensec_krb5_state
->state_position
= GENSEC_KRB5_DONE
;
497 krb5_free_ap_rep_enc_part(gensec_krb5_state
->smb_krb5_context
->krb5_context
, repl
);
502 case GENSEC_KRB5_SERVER_START
:
504 DATA_BLOB unwrapped_in
;
505 DATA_BLOB unwrapped_out
= data_blob(NULL
, 0);
506 krb5_data inbuf
, outbuf
;
508 struct keytab_container
*keytab
;
509 krb5_principal server_in_keytab
;
510 const char *error_string
;
511 enum credentials_obtained obtained
;
514 return NT_STATUS_INVALID_PARAMETER
;
517 /* Grab the keytab, however generated */
518 ret
= cli_credentials_get_keytab(gensec_get_credentials(gensec_security
),
519 gensec_security
->settings
->lp_ctx
, &keytab
);
521 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO
;
524 /* This ensures we lookup the correct entry in that
525 * keytab. A NULL principal is acceptable, and means
526 * that the krb5 libs should search the keytab at
527 * accept time for any matching key */
528 ret
= principal_from_credentials(out_mem_ctx
, gensec_get_credentials(gensec_security
),
529 gensec_krb5_state
->smb_krb5_context
,
530 &server_in_keytab
, &obtained
, &error_string
);
533 DEBUG(2,("Failed to make credentials from principal: %s\n", error_string
));
534 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO
;
537 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
538 if (gensec_krb5_state
->gssapi
539 && gensec_gssapi_parse_krb5_wrap(out_mem_ctx
, &in
, &unwrapped_in
, tok_id
)) {
540 inbuf
.data
= unwrapped_in
.data
;
541 inbuf
.length
= unwrapped_in
.length
;
543 inbuf
.data
= in
.data
;
544 inbuf
.length
= in
.length
;
547 ret
= smb_rd_req_return_stuff(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
548 &gensec_krb5_state
->auth_context
,
549 &inbuf
, keytab
->keytab
, server_in_keytab
,
551 &gensec_krb5_state
->ticket
,
552 &gensec_krb5_state
->keyblock
);
555 return NT_STATUS_LOGON_FAILURE
;
557 unwrapped_out
.data
= (uint8_t *)outbuf
.data
;
558 unwrapped_out
.length
= outbuf
.length
;
559 gensec_krb5_state
->state_position
= GENSEC_KRB5_DONE
;
560 /* wrap that up in a nice GSS-API wrapping */
561 if (gensec_krb5_state
->gssapi
) {
562 *out
= gensec_gssapi_gen_krb5_wrap(out_mem_ctx
, &unwrapped_out
, TOK_ID_KRB_AP_REP
);
564 *out
= data_blob_talloc(out_mem_ctx
, outbuf
.data
, outbuf
.length
);
566 krb5_data_free(&outbuf
);
570 case GENSEC_KRB5_DONE
:
572 /* Asking too many times... */
573 return NT_STATUS_INVALID_PARAMETER
;
577 static NTSTATUS
gensec_krb5_session_key(struct gensec_security
*gensec_security
,
579 DATA_BLOB
*session_key
)
581 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
582 krb5_context context
= gensec_krb5_state
->smb_krb5_context
->krb5_context
;
583 krb5_auth_context auth_context
= gensec_krb5_state
->auth_context
;
585 krb5_error_code err
= -1;
587 if (gensec_krb5_state
->state_position
!= GENSEC_KRB5_DONE
) {
588 return NT_STATUS_NO_USER_SESSION_KEY
;
591 switch (gensec_security
->gensec_role
) {
593 err
= krb5_auth_con_getlocalsubkey(context
, auth_context
, &skey
);
596 err
= krb5_auth_con_getremotesubkey(context
, auth_context
, &skey
);
599 if (err
== 0 && skey
!= NULL
) {
600 DEBUG(10, ("Got KRB5 session key of length %d\n",
601 (int)KRB5_KEY_LENGTH(skey
)));
602 *session_key
= data_blob_talloc(mem_ctx
,
603 KRB5_KEY_DATA(skey
), KRB5_KEY_LENGTH(skey
));
604 dump_data_pw("KRB5 Session Key:\n", session_key
->data
, session_key
->length
);
606 krb5_free_keyblock(context
, skey
);
609 DEBUG(10, ("KRB5 error getting session key %d\n", err
));
610 return NT_STATUS_NO_USER_SESSION_KEY
;
614 static NTSTATUS
gensec_krb5_session_info(struct gensec_security
*gensec_security
,
615 TALLOC_CTX
*mem_ctx_out
,
616 struct auth_session_info
**_session_info
)
618 NTSTATUS nt_status
= NT_STATUS_UNSUCCESSFUL
;
619 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
620 krb5_context context
= gensec_krb5_state
->smb_krb5_context
->krb5_context
;
621 struct auth_user_info_dc
*user_info_dc
= NULL
;
622 struct auth_session_info
*session_info
= NULL
;
623 struct PAC_LOGON_INFO
*logon_info
;
625 krb5_principal client_principal
;
626 char *principal_string
;
633 TALLOC_CTX
*mem_ctx
= talloc_new(mem_ctx_out
);
635 return NT_STATUS_NO_MEMORY
;
638 ret
= krb5_ticket_get_client(context
, gensec_krb5_state
->ticket
, &client_principal
);
640 DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
641 smb_get_krb5_error_message(context
,
643 talloc_free(mem_ctx
);
644 return NT_STATUS_NO_MEMORY
;
647 ret
= krb5_unparse_name(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
648 client_principal
, &principal_string
);
650 DEBUG(1, ("Unable to parse client principal: %s\n",
651 smb_get_krb5_error_message(context
,
653 krb5_free_principal(context
, client_principal
);
654 talloc_free(mem_ctx
);
655 return NT_STATUS_NO_MEMORY
;
658 ret
= krb5_ticket_get_authorization_data_type(context
, gensec_krb5_state
->ticket
,
659 KRB5_AUTHDATA_WIN2K_PAC
,
662 if (ret
&& gensec_setting_bool(gensec_security
->settings
, "gensec", "require_pac", false)) {
663 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s \n",
665 smb_get_krb5_error_message(context
,
667 free(principal_string
);
668 krb5_free_principal(context
, client_principal
);
669 talloc_free(mem_ctx
);
670 return NT_STATUS_ACCESS_DENIED
;
673 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
674 smb_get_krb5_error_message(context
,
676 if (gensec_security
->auth_context
&&
677 !gensec_setting_bool(gensec_security
->settings
, "gensec", "require_pac", false)) {
678 DEBUG(1, ("Unable to find PAC for %s, resorting to local user lookup: %s",
679 principal_string
, smb_get_krb5_error_message(context
,
681 nt_status
= gensec_security
->auth_context
->get_user_info_dc_principal(mem_ctx
,
682 gensec_security
->auth_context
,
684 NULL
, &user_info_dc
);
685 if (!NT_STATUS_IS_OK(nt_status
)) {
686 free(principal_string
);
687 krb5_free_principal(context
, client_principal
);
688 talloc_free(mem_ctx
);
692 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access\n",
694 free(principal_string
);
695 krb5_free_principal(context
, client_principal
);
696 talloc_free(mem_ctx
);
697 return NT_STATUS_ACCESS_DENIED
;
701 union netr_Validation validation
;
703 pac
= data_blob_talloc(mem_ctx
, pac_data
.data
, pac_data
.length
);
705 free(principal_string
);
706 krb5_free_principal(context
, client_principal
);
707 talloc_free(mem_ctx
);
708 return NT_STATUS_NO_MEMORY
;
711 /* decode and verify the pac */
712 nt_status
= kerberos_pac_logon_info(gensec_krb5_state
,
714 gensec_krb5_state
->smb_krb5_context
->krb5_context
,
715 NULL
, gensec_krb5_state
->keyblock
,
717 gensec_krb5_state
->ticket
->ticket
.authtime
, &logon_info
);
719 if (!NT_STATUS_IS_OK(nt_status
)) {
720 free(principal_string
);
721 krb5_free_principal(context
, client_principal
);
722 talloc_free(mem_ctx
);
726 validation
.sam3
= &logon_info
->info3
;
727 nt_status
= make_user_info_dc_netlogon_validation(mem_ctx
,
730 true, /* This user was authenticated */
732 if (!NT_STATUS_IS_OK(nt_status
)) {
733 free(principal_string
);
734 krb5_free_principal(context
, client_principal
);
735 talloc_free(mem_ctx
);
740 free(principal_string
);
741 krb5_free_principal(context
, client_principal
);
743 /* references the user_info_dc into the session_info */
744 nt_status
= gensec_generate_session_info(mem_ctx
, gensec_security
, user_info_dc
, &session_info
);
746 if (!NT_STATUS_IS_OK(nt_status
)) {
747 talloc_free(mem_ctx
);
751 nt_status
= gensec_krb5_session_key(gensec_security
, session_info
, &session_info
->session_key
);
753 if (!NT_STATUS_IS_OK(nt_status
)) {
754 talloc_free(mem_ctx
);
758 *_session_info
= talloc_steal(mem_ctx_out
, session_info
);
760 talloc_free(mem_ctx
);
764 static NTSTATUS
gensec_krb5_wrap(struct gensec_security
*gensec_security
,
769 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
770 krb5_context context
= gensec_krb5_state
->smb_krb5_context
->krb5_context
;
771 krb5_auth_context auth_context
= gensec_krb5_state
->auth_context
;
773 krb5_data input
, output
;
774 input
.length
= in
->length
;
775 input
.data
= in
->data
;
777 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
778 ret
= krb5_mk_priv(context
, auth_context
, &input
, &output
, NULL
);
780 DEBUG(1, ("krb5_mk_priv failed: %s\n",
781 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
783 return NT_STATUS_ACCESS_DENIED
;
785 *out
= data_blob_talloc(mem_ctx
, output
.data
, output
.length
);
787 krb5_data_free(&output
);
789 return NT_STATUS_ACCESS_DENIED
;
794 static NTSTATUS
gensec_krb5_unwrap(struct gensec_security
*gensec_security
,
799 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
800 krb5_context context
= gensec_krb5_state
->smb_krb5_context
->krb5_context
;
801 krb5_auth_context auth_context
= gensec_krb5_state
->auth_context
;
803 krb5_data input
, output
;
804 krb5_replay_data replay
;
805 input
.length
= in
->length
;
806 input
.data
= in
->data
;
808 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
809 ret
= krb5_rd_priv(context
, auth_context
, &input
, &output
, &replay
);
811 DEBUG(1, ("krb5_rd_priv failed: %s\n",
812 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
814 return NT_STATUS_ACCESS_DENIED
;
816 *out
= data_blob_talloc(mem_ctx
, output
.data
, output
.length
);
818 krb5_data_free(&output
);
820 return NT_STATUS_ACCESS_DENIED
;
825 static bool gensec_krb5_have_feature(struct gensec_security
*gensec_security
,
828 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
829 if (feature
& GENSEC_FEATURE_SESSION_KEY
) {
832 if (!gensec_krb5_state
->gssapi
&&
833 (feature
& GENSEC_FEATURE_SEAL
)) {
840 static const char *gensec_krb5_oids
[] = {
841 GENSEC_OID_KERBEROS5
,
842 GENSEC_OID_KERBEROS5_OLD
,
846 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops
= {
847 .name
= "fake_gssapi_krb5",
848 .auth_type
= DCERPC_AUTH_TYPE_KRB5
,
849 .oid
= gensec_krb5_oids
,
850 .client_start
= gensec_fake_gssapi_krb5_client_start
,
851 .server_start
= gensec_fake_gssapi_krb5_server_start
,
852 .update
= gensec_krb5_update
,
853 .magic
= gensec_fake_gssapi_krb5_magic
,
854 .session_key
= gensec_krb5_session_key
,
855 .session_info
= gensec_krb5_session_info
,
856 .have_feature
= gensec_krb5_have_feature
,
859 .priority
= GENSEC_KRB5
862 static const struct gensec_security_ops gensec_krb5_security_ops
= {
864 .client_start
= gensec_krb5_client_start
,
865 .server_start
= gensec_krb5_server_start
,
866 .update
= gensec_krb5_update
,
867 .session_key
= gensec_krb5_session_key
,
868 .session_info
= gensec_krb5_session_info
,
869 .have_feature
= gensec_krb5_have_feature
,
870 .wrap
= gensec_krb5_wrap
,
871 .unwrap
= gensec_krb5_unwrap
,
874 .priority
= GENSEC_KRB5
877 _PUBLIC_ NTSTATUS
gensec_krb5_init(void)
881 ret
= gensec_register(&gensec_krb5_security_ops
);
882 if (!NT_STATUS_IS_OK(ret
)) {
883 DEBUG(0,("Failed to register '%s' gensec backend!\n",
884 gensec_krb5_security_ops
.name
));
888 ret
= gensec_register(&gensec_fake_gssapi_krb5_security_ops
);
889 if (!NT_STATUS_IS_OK(ret
)) {
890 DEBUG(0,("Failed to register '%s' gensec backend!\n",
891 gensec_krb5_security_ops
.name
));