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 "param/param.h"
39 #include "auth/auth_sam_reply.h"
40 #include "lib/util/util_net.h"
42 enum GENSEC_KRB5_STATE
{
43 GENSEC_KRB5_SERVER_START
,
44 GENSEC_KRB5_CLIENT_START
,
45 GENSEC_KRB5_CLIENT_MUTUAL_AUTH
,
49 struct gensec_krb5_state
{
50 DATA_BLOB session_key
;
52 enum GENSEC_KRB5_STATE state_position
;
53 struct smb_krb5_context
*smb_krb5_context
;
54 krb5_auth_context auth_context
;
56 krb5_keyblock
*keyblock
;
59 krb5_flags ap_req_options
;
62 static int gensec_krb5_destroy(struct gensec_krb5_state
*gensec_krb5_state
)
64 if (!gensec_krb5_state
->smb_krb5_context
) {
65 /* We can't clean anything else up unless we started up this far */
68 if (gensec_krb5_state
->enc_ticket
.length
) {
69 kerberos_free_data_contents(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
70 &gensec_krb5_state
->enc_ticket
);
73 if (gensec_krb5_state
->ticket
) {
74 krb5_free_ticket(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
75 gensec_krb5_state
->ticket
);
78 /* ccache freed in a child destructor */
80 krb5_free_keyblock(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
81 gensec_krb5_state
->keyblock
);
83 if (gensec_krb5_state
->auth_context
) {
84 krb5_auth_con_free(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
85 gensec_krb5_state
->auth_context
);
91 static NTSTATUS
gensec_krb5_start(struct gensec_security
*gensec_security
, bool gssapi
)
94 struct gensec_krb5_state
*gensec_krb5_state
;
95 struct cli_credentials
*creds
;
96 const struct tsocket_address
*tlocal_addr
, *tremote_addr
;
97 krb5_address my_krb5_addr
, peer_krb5_addr
;
99 creds
= gensec_get_credentials(gensec_security
);
101 return NT_STATUS_INVALID_PARAMETER
;
104 gensec_krb5_state
= talloc(gensec_security
, struct gensec_krb5_state
);
105 if (!gensec_krb5_state
) {
106 return NT_STATUS_NO_MEMORY
;
109 gensec_security
->private_data
= gensec_krb5_state
;
110 gensec_krb5_state
->smb_krb5_context
= NULL
;
111 gensec_krb5_state
->auth_context
= NULL
;
112 gensec_krb5_state
->ticket
= NULL
;
113 ZERO_STRUCT(gensec_krb5_state
->enc_ticket
);
114 gensec_krb5_state
->keyblock
= NULL
;
115 gensec_krb5_state
->session_key
= data_blob(NULL
, 0);
116 gensec_krb5_state
->pac
= data_blob(NULL
, 0);
117 gensec_krb5_state
->gssapi
= gssapi
;
119 talloc_set_destructor(gensec_krb5_state
, gensec_krb5_destroy
);
121 if (cli_credentials_get_krb5_context(creds
,
122 gensec_security
->settings
->lp_ctx
, &gensec_krb5_state
->smb_krb5_context
)) {
123 talloc_free(gensec_krb5_state
);
124 return NT_STATUS_INTERNAL_ERROR
;
127 ret
= krb5_auth_con_init(gensec_krb5_state
->smb_krb5_context
->krb5_context
, &gensec_krb5_state
->auth_context
);
129 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
130 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
131 ret
, gensec_krb5_state
)));
132 talloc_free(gensec_krb5_state
);
133 return NT_STATUS_INTERNAL_ERROR
;
136 ret
= krb5_auth_con_setflags(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
137 gensec_krb5_state
->auth_context
,
138 KRB5_AUTH_CONTEXT_DO_SEQUENCE
);
140 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
141 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
142 ret
, gensec_krb5_state
)));
143 talloc_free(gensec_krb5_state
);
144 return NT_STATUS_INTERNAL_ERROR
;
147 tlocal_addr
= gensec_get_local_address(gensec_security
);
150 struct sockaddr_storage ss
;
152 socklen
= tsocket_address_bsd_sockaddr(tlocal_addr
,
153 (struct sockaddr
*) &ss
,
154 sizeof(struct sockaddr_storage
));
156 talloc_free(gensec_krb5_state
);
157 return NT_STATUS_INTERNAL_ERROR
;
159 ret
= krb5_sockaddr2address(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
160 (const struct sockaddr
*) &ss
, &my_krb5_addr
);
162 DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
163 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
164 ret
, gensec_krb5_state
)));
165 talloc_free(gensec_krb5_state
);
166 return NT_STATUS_INTERNAL_ERROR
;
170 tremote_addr
= gensec_get_remote_address(gensec_security
);
173 struct sockaddr_storage ss
;
175 socklen
= tsocket_address_bsd_sockaddr(tremote_addr
,
176 (struct sockaddr
*) &ss
,
177 sizeof(struct sockaddr_storage
));
179 talloc_free(gensec_krb5_state
);
180 return NT_STATUS_INTERNAL_ERROR
;
182 ret
= krb5_sockaddr2address(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
183 (const struct sockaddr
*) &ss
, &peer_krb5_addr
);
185 DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
186 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
187 ret
, gensec_krb5_state
)));
188 talloc_free(gensec_krb5_state
);
189 return NT_STATUS_INTERNAL_ERROR
;
193 ret
= krb5_auth_con_setaddrs(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
194 gensec_krb5_state
->auth_context
,
195 tlocal_addr
? &my_krb5_addr
: NULL
,
196 tremote_addr
? &peer_krb5_addr
: NULL
);
198 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
199 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
200 ret
, gensec_krb5_state
)));
201 talloc_free(gensec_krb5_state
);
202 return NT_STATUS_INTERNAL_ERROR
;
208 static NTSTATUS
gensec_krb5_common_server_start(struct gensec_security
*gensec_security
, bool gssapi
)
211 struct gensec_krb5_state
*gensec_krb5_state
;
213 nt_status
= gensec_krb5_start(gensec_security
, gssapi
);
214 if (!NT_STATUS_IS_OK(nt_status
)) {
218 gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
219 gensec_krb5_state
->state_position
= GENSEC_KRB5_SERVER_START
;
224 static NTSTATUS
gensec_krb5_server_start(struct gensec_security
*gensec_security
)
226 return gensec_krb5_common_server_start(gensec_security
, false);
229 static NTSTATUS
gensec_fake_gssapi_krb5_server_start(struct gensec_security
*gensec_security
)
231 return gensec_krb5_common_server_start(gensec_security
, true);
234 static NTSTATUS
gensec_krb5_common_client_start(struct gensec_security
*gensec_security
, bool gssapi
)
236 struct gensec_krb5_state
*gensec_krb5_state
;
239 struct ccache_container
*ccache_container
;
240 const char *hostname
;
241 const char *error_string
;
242 const char *principal
;
244 struct tevent_context
*previous_ev
;
246 hostname
= gensec_get_target_hostname(gensec_security
);
248 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
249 return NT_STATUS_INVALID_PARAMETER
;
251 if (is_ipaddress(hostname
)) {
252 DEBUG(2, ("Cannot do krb5 to an IP address"));
253 return NT_STATUS_INVALID_PARAMETER
;
255 if (strcmp(hostname
, "localhost") == 0) {
256 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
257 return NT_STATUS_INVALID_PARAMETER
;
260 nt_status
= gensec_krb5_start(gensec_security
, gssapi
);
261 if (!NT_STATUS_IS_OK(nt_status
)) {
265 gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
266 gensec_krb5_state
->state_position
= GENSEC_KRB5_CLIENT_START
;
267 gensec_krb5_state
->ap_req_options
= AP_OPTS_USE_SUBKEY
;
269 if (gensec_krb5_state
->gssapi
) {
270 /* The Fake GSSAPI modal emulates Samba3, which does not do mutual authentication */
271 if (gensec_setting_bool(gensec_security
->settings
, "gensec_fake_gssapi_krb5", "mutual", false)) {
272 gensec_krb5_state
->ap_req_options
|= AP_OPTS_MUTUAL_REQUIRED
;
275 /* The wrapping for KPASSWD (a user of the raw KRB5 API) should be mutually authenticated */
276 if (gensec_setting_bool(gensec_security
->settings
, "gensec_krb5", "mutual", true)) {
277 gensec_krb5_state
->ap_req_options
|= AP_OPTS_MUTUAL_REQUIRED
;
281 principal
= gensec_get_target_principal(gensec_security
);
283 ret
= cli_credentials_get_ccache(gensec_get_credentials(gensec_security
),
284 gensec_security
->event_ctx
,
285 gensec_security
->settings
->lp_ctx
, &ccache_container
, &error_string
);
289 case KRB5KDC_ERR_PREAUTH_FAILED
:
290 case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN
:
291 return NT_STATUS_LOGON_FAILURE
;
292 case KRB5_KDC_UNREACH
:
293 DEBUG(3, ("Cannot reach a KDC we require to contact %s: %s\n", principal
, error_string
));
294 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
295 case KRB5_CC_NOTFOUND
:
297 DEBUG(3, ("Error preparing credentials we require to contact %s : %s\n", principal
, error_string
));
298 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
300 DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_string
));
301 return NT_STATUS_UNSUCCESSFUL
;
305 /* Do this every time, in case we have weird recursive issues here */
306 ret
= smb_krb5_context_set_event_ctx(gensec_krb5_state
->smb_krb5_context
, gensec_security
->event_ctx
, &previous_ev
);
308 DEBUG(1, ("gensec_krb5_start: Setting event context failed\n"));
309 return NT_STATUS_NO_MEMORY
;
312 krb5_principal target_principal
;
313 ret
= krb5_parse_name(gensec_krb5_state
->smb_krb5_context
->krb5_context
, principal
,
316 ret
= krb5_mk_req_exact(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
317 &gensec_krb5_state
->auth_context
,
318 gensec_krb5_state
->ap_req_options
,
320 &in_data
, ccache_container
->ccache
,
321 &gensec_krb5_state
->enc_ticket
);
322 krb5_free_principal(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
326 ret
= krb5_mk_req(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
327 &gensec_krb5_state
->auth_context
,
328 gensec_krb5_state
->ap_req_options
,
329 gensec_get_target_service(gensec_security
),
331 &in_data
, ccache_container
->ccache
,
332 &gensec_krb5_state
->enc_ticket
);
335 smb_krb5_context_remove_event_ctx(gensec_krb5_state
->smb_krb5_context
, previous_ev
, gensec_security
->event_ctx
);
340 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
:
341 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
342 hostname
, smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, gensec_krb5_state
)));
343 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
344 case KRB5_KDC_UNREACH
:
345 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
346 hostname
, smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, gensec_krb5_state
)));
347 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
348 case KRB5KDC_ERR_PREAUTH_FAILED
:
349 case KRB5KRB_AP_ERR_TKT_EXPIRED
:
351 /* Too much clock skew - we will need to kinit to re-skew the clock */
352 case KRB5KRB_AP_ERR_SKEW
:
353 case KRB5_KDCREP_SKEW
:
355 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
356 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, gensec_krb5_state
)));
360 /* just don't print a message for these really ordinary messages */
361 case KRB5_FCC_NOFILE
:
362 case KRB5_CC_NOTFOUND
:
365 return NT_STATUS_UNSUCCESSFUL
;
369 DEBUG(0, ("kerberos: %s\n",
370 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, gensec_krb5_state
)));
371 return NT_STATUS_UNSUCCESSFUL
;
375 static NTSTATUS
gensec_krb5_client_start(struct gensec_security
*gensec_security
)
377 return gensec_krb5_common_client_start(gensec_security
, false);
380 static NTSTATUS
gensec_fake_gssapi_krb5_client_start(struct gensec_security
*gensec_security
)
382 return gensec_krb5_common_client_start(gensec_security
, true);
386 * Check if the packet is one for this mechansim
388 * @param gensec_security GENSEC state
389 * @param in The request, as a DATA_BLOB
390 * @return Error, INVALID_PARAMETER if it's not a packet for us
391 * or NT_STATUS_OK if the packet is ok.
394 static NTSTATUS
gensec_fake_gssapi_krb5_magic(struct gensec_security
*gensec_security
,
397 if (gensec_gssapi_check_oid(in
, GENSEC_OID_KERBEROS5
)) {
400 return NT_STATUS_INVALID_PARAMETER
;
406 * Next state function for the Krb5 GENSEC mechanism
408 * @param gensec_krb5_state KRB5 State
409 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
410 * @param in The request, as a DATA_BLOB
411 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
412 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
413 * or NT_STATUS_OK if the user is authenticated.
416 static NTSTATUS
gensec_krb5_update(struct gensec_security
*gensec_security
,
417 TALLOC_CTX
*out_mem_ctx
,
418 const DATA_BLOB in
, DATA_BLOB
*out
)
420 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
421 krb5_error_code ret
= 0;
424 switch (gensec_krb5_state
->state_position
) {
425 case GENSEC_KRB5_CLIENT_START
:
427 DATA_BLOB unwrapped_out
;
429 if (gensec_krb5_state
->gssapi
) {
430 unwrapped_out
= data_blob_talloc(out_mem_ctx
, gensec_krb5_state
->enc_ticket
.data
, gensec_krb5_state
->enc_ticket
.length
);
432 /* wrap that up in a nice GSS-API wrapping */
433 *out
= gensec_gssapi_gen_krb5_wrap(out_mem_ctx
, &unwrapped_out
, TOK_ID_KRB_AP_REQ
);
435 *out
= data_blob_talloc(out_mem_ctx
, gensec_krb5_state
->enc_ticket
.data
, gensec_krb5_state
->enc_ticket
.length
);
437 if (gensec_krb5_state
->ap_req_options
& AP_OPTS_MUTUAL_REQUIRED
) {
438 gensec_krb5_state
->state_position
= GENSEC_KRB5_CLIENT_MUTUAL_AUTH
;
439 nt_status
= NT_STATUS_MORE_PROCESSING_REQUIRED
;
441 gensec_krb5_state
->state_position
= GENSEC_KRB5_DONE
;
442 nt_status
= NT_STATUS_OK
;
447 case GENSEC_KRB5_CLIENT_MUTUAL_AUTH
:
449 DATA_BLOB unwrapped_in
;
451 krb5_ap_rep_enc_part
*repl
= NULL
;
454 if (gensec_krb5_state
->gssapi
) {
455 if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx
, &in
, &unwrapped_in
, tok_id
)) {
456 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
457 dump_data_pw("Mutual authentication message:\n", in
.data
, in
.length
);
458 return NT_STATUS_INVALID_PARAMETER
;
463 /* TODO: check the tok_id */
465 inbuf
.data
= unwrapped_in
.data
;
466 inbuf
.length
= unwrapped_in
.length
;
467 ret
= krb5_rd_rep(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
468 gensec_krb5_state
->auth_context
,
471 DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
472 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
, ret
, out_mem_ctx
)));
473 dump_data_pw("Mutual authentication message:\n", (uint8_t *)inbuf
.data
, inbuf
.length
);
474 nt_status
= NT_STATUS_ACCESS_DENIED
;
476 *out
= data_blob(NULL
, 0);
477 nt_status
= NT_STATUS_OK
;
478 gensec_krb5_state
->state_position
= GENSEC_KRB5_DONE
;
481 krb5_free_ap_rep_enc_part(gensec_krb5_state
->smb_krb5_context
->krb5_context
, repl
);
486 case GENSEC_KRB5_SERVER_START
:
488 DATA_BLOB unwrapped_in
;
489 DATA_BLOB unwrapped_out
= data_blob(NULL
, 0);
490 krb5_data inbuf
, outbuf
;
492 struct keytab_container
*keytab
;
493 krb5_principal server_in_keytab
;
494 const char *error_string
;
495 enum credentials_obtained obtained
;
498 return NT_STATUS_INVALID_PARAMETER
;
501 /* Grab the keytab, however generated */
502 ret
= cli_credentials_get_keytab(gensec_get_credentials(gensec_security
),
503 gensec_security
->settings
->lp_ctx
, &keytab
);
505 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO
;
508 /* This ensures we lookup the correct entry in that keytab */
509 ret
= principal_from_credentials(out_mem_ctx
, gensec_get_credentials(gensec_security
),
510 gensec_krb5_state
->smb_krb5_context
,
511 &server_in_keytab
, &obtained
, &error_string
);
514 DEBUG(2,("Failed to make credentials from principal: %s\n", error_string
));
515 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO
;
518 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
519 if (gensec_krb5_state
->gssapi
520 && gensec_gssapi_parse_krb5_wrap(out_mem_ctx
, &in
, &unwrapped_in
, tok_id
)) {
521 inbuf
.data
= unwrapped_in
.data
;
522 inbuf
.length
= unwrapped_in
.length
;
524 inbuf
.data
= in
.data
;
525 inbuf
.length
= in
.length
;
528 ret
= smb_rd_req_return_stuff(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
529 &gensec_krb5_state
->auth_context
,
530 &inbuf
, keytab
->keytab
, server_in_keytab
,
532 &gensec_krb5_state
->ticket
,
533 &gensec_krb5_state
->keyblock
);
536 return NT_STATUS_LOGON_FAILURE
;
538 unwrapped_out
.data
= (uint8_t *)outbuf
.data
;
539 unwrapped_out
.length
= outbuf
.length
;
540 gensec_krb5_state
->state_position
= GENSEC_KRB5_DONE
;
541 /* wrap that up in a nice GSS-API wrapping */
542 if (gensec_krb5_state
->gssapi
) {
543 *out
= gensec_gssapi_gen_krb5_wrap(out_mem_ctx
, &unwrapped_out
, TOK_ID_KRB_AP_REP
);
545 *out
= data_blob_talloc(out_mem_ctx
, outbuf
.data
, outbuf
.length
);
547 krb5_data_free(&outbuf
);
551 case GENSEC_KRB5_DONE
:
553 /* Asking too many times... */
554 return NT_STATUS_INVALID_PARAMETER
;
558 static NTSTATUS
gensec_krb5_session_key(struct gensec_security
*gensec_security
,
559 DATA_BLOB
*session_key
)
561 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
562 krb5_context context
= gensec_krb5_state
->smb_krb5_context
->krb5_context
;
563 krb5_auth_context auth_context
= gensec_krb5_state
->auth_context
;
565 krb5_error_code err
= -1;
567 if (gensec_krb5_state
->state_position
!= GENSEC_KRB5_DONE
) {
568 return NT_STATUS_NO_USER_SESSION_KEY
;
571 if (gensec_krb5_state
->session_key
.data
) {
572 *session_key
= gensec_krb5_state
->session_key
;
576 switch (gensec_security
->gensec_role
) {
578 err
= krb5_auth_con_getlocalsubkey(context
, auth_context
, &skey
);
581 err
= krb5_auth_con_getremotesubkey(context
, auth_context
, &skey
);
584 if (err
== 0 && skey
!= NULL
) {
585 DEBUG(10, ("Got KRB5 session key of length %d\n",
586 (int)KRB5_KEY_LENGTH(skey
)));
587 gensec_krb5_state
->session_key
= data_blob_talloc(gensec_krb5_state
,
588 KRB5_KEY_DATA(skey
), KRB5_KEY_LENGTH(skey
));
589 *session_key
= gensec_krb5_state
->session_key
;
590 dump_data_pw("KRB5 Session Key:\n", session_key
->data
, session_key
->length
);
592 krb5_free_keyblock(context
, skey
);
595 DEBUG(10, ("KRB5 error getting session key %d\n", err
));
596 return NT_STATUS_NO_USER_SESSION_KEY
;
600 static NTSTATUS
gensec_krb5_session_info(struct gensec_security
*gensec_security
,
601 struct auth_session_info
**_session_info
)
603 NTSTATUS nt_status
= NT_STATUS_UNSUCCESSFUL
;
604 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
605 krb5_context context
= gensec_krb5_state
->smb_krb5_context
->krb5_context
;
606 struct auth_user_info_dc
*user_info_dc
= NULL
;
607 struct auth_session_info
*session_info
= NULL
;
608 struct PAC_LOGON_INFO
*logon_info
;
610 krb5_principal client_principal
;
611 char *principal_string
;
618 TALLOC_CTX
*mem_ctx
= talloc_new(gensec_security
);
620 return NT_STATUS_NO_MEMORY
;
623 ret
= krb5_ticket_get_client(context
, gensec_krb5_state
->ticket
, &client_principal
);
625 DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
626 smb_get_krb5_error_message(context
,
628 talloc_free(mem_ctx
);
629 return NT_STATUS_NO_MEMORY
;
632 ret
= krb5_unparse_name(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
633 client_principal
, &principal_string
);
635 DEBUG(1, ("Unable to parse client principal: %s\n",
636 smb_get_krb5_error_message(context
,
638 krb5_free_principal(context
, client_principal
);
639 talloc_free(mem_ctx
);
640 return NT_STATUS_NO_MEMORY
;
643 ret
= krb5_ticket_get_authorization_data_type(context
, gensec_krb5_state
->ticket
,
644 KRB5_AUTHDATA_WIN2K_PAC
,
647 if (ret
&& gensec_setting_bool(gensec_security
->settings
, "gensec", "require_pac", false)) {
648 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s \n",
650 smb_get_krb5_error_message(context
,
652 free(principal_string
);
653 krb5_free_principal(context
, client_principal
);
654 talloc_free(mem_ctx
);
655 return NT_STATUS_ACCESS_DENIED
;
658 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
659 smb_get_krb5_error_message(context
,
661 if (gensec_security
->auth_context
&&
662 !gensec_setting_bool(gensec_security
->settings
, "gensec", "require_pac", false)) {
663 DEBUG(1, ("Unable to find PAC for %s, resorting to local user lookup: %s",
664 principal_string
, smb_get_krb5_error_message(context
,
666 nt_status
= gensec_security
->auth_context
->get_user_info_dc_principal(mem_ctx
,
667 gensec_security
->auth_context
,
669 NULL
, &user_info_dc
);
670 if (!NT_STATUS_IS_OK(nt_status
)) {
671 free(principal_string
);
672 krb5_free_principal(context
, client_principal
);
673 talloc_free(mem_ctx
);
677 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access\n",
679 free(principal_string
);
680 krb5_free_principal(context
, client_principal
);
681 talloc_free(mem_ctx
);
682 return NT_STATUS_ACCESS_DENIED
;
686 union netr_Validation validation
;
688 pac
= data_blob_talloc(mem_ctx
, pac_data
.data
, pac_data
.length
);
690 free(principal_string
);
691 krb5_free_principal(context
, client_principal
);
692 talloc_free(mem_ctx
);
693 return NT_STATUS_NO_MEMORY
;
696 /* decode and verify the pac */
697 nt_status
= kerberos_pac_logon_info(gensec_krb5_state
,
699 gensec_krb5_state
->smb_krb5_context
->krb5_context
,
700 NULL
, gensec_krb5_state
->keyblock
,
702 gensec_krb5_state
->ticket
->ticket
.authtime
, NULL
);
704 if (!NT_STATUS_IS_OK(nt_status
)) {
705 free(principal_string
);
706 krb5_free_principal(context
, client_principal
);
707 talloc_free(mem_ctx
);
711 validation
.sam3
= &logon_info
->info3
;
712 nt_status
= make_user_info_dc_netlogon_validation(mem_ctx
,
716 if (!NT_STATUS_IS_OK(nt_status
)) {
717 free(principal_string
);
718 krb5_free_principal(context
, client_principal
);
719 talloc_free(mem_ctx
);
724 free(principal_string
);
725 krb5_free_principal(context
, client_principal
);
727 /* references the user_info_dc into the session_info */
728 nt_status
= gensec_generate_session_info(mem_ctx
, gensec_security
, user_info_dc
, &session_info
);
730 if (!NT_STATUS_IS_OK(nt_status
)) {
731 talloc_free(mem_ctx
);
735 nt_status
= gensec_krb5_session_key(gensec_security
, &session_info
->session_key
);
737 if (!NT_STATUS_IS_OK(nt_status
)) {
738 talloc_free(mem_ctx
);
742 *_session_info
= session_info
;
744 talloc_steal(gensec_krb5_state
, session_info
);
745 talloc_free(mem_ctx
);
749 static NTSTATUS
gensec_krb5_wrap(struct gensec_security
*gensec_security
,
754 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
755 krb5_context context
= gensec_krb5_state
->smb_krb5_context
->krb5_context
;
756 krb5_auth_context auth_context
= gensec_krb5_state
->auth_context
;
758 krb5_data input
, output
;
759 input
.length
= in
->length
;
760 input
.data
= in
->data
;
762 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
763 ret
= krb5_mk_priv(context
, auth_context
, &input
, &output
, NULL
);
765 DEBUG(1, ("krb5_mk_priv failed: %s\n",
766 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
768 return NT_STATUS_ACCESS_DENIED
;
770 *out
= data_blob_talloc(mem_ctx
, output
.data
, output
.length
);
772 krb5_data_free(&output
);
774 return NT_STATUS_ACCESS_DENIED
;
779 static NTSTATUS
gensec_krb5_unwrap(struct gensec_security
*gensec_security
,
784 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
785 krb5_context context
= gensec_krb5_state
->smb_krb5_context
->krb5_context
;
786 krb5_auth_context auth_context
= gensec_krb5_state
->auth_context
;
788 krb5_data input
, output
;
789 krb5_replay_data replay
;
790 input
.length
= in
->length
;
791 input
.data
= in
->data
;
793 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
794 ret
= krb5_rd_priv(context
, auth_context
, &input
, &output
, &replay
);
796 DEBUG(1, ("krb5_rd_priv failed: %s\n",
797 smb_get_krb5_error_message(gensec_krb5_state
->smb_krb5_context
->krb5_context
,
799 return NT_STATUS_ACCESS_DENIED
;
801 *out
= data_blob_talloc(mem_ctx
, output
.data
, output
.length
);
803 krb5_data_free(&output
);
805 return NT_STATUS_ACCESS_DENIED
;
810 static bool gensec_krb5_have_feature(struct gensec_security
*gensec_security
,
813 struct gensec_krb5_state
*gensec_krb5_state
= (struct gensec_krb5_state
*)gensec_security
->private_data
;
814 if (feature
& GENSEC_FEATURE_SESSION_KEY
) {
817 if (!gensec_krb5_state
->gssapi
&&
818 (feature
& GENSEC_FEATURE_SEAL
)) {
825 static const char *gensec_krb5_oids
[] = {
826 GENSEC_OID_KERBEROS5
,
827 GENSEC_OID_KERBEROS5_OLD
,
831 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops
= {
832 .name
= "fake_gssapi_krb5",
833 .auth_type
= DCERPC_AUTH_TYPE_KRB5
,
834 .oid
= gensec_krb5_oids
,
835 .client_start
= gensec_fake_gssapi_krb5_client_start
,
836 .server_start
= gensec_fake_gssapi_krb5_server_start
,
837 .update
= gensec_krb5_update
,
838 .magic
= gensec_fake_gssapi_krb5_magic
,
839 .session_key
= gensec_krb5_session_key
,
840 .session_info
= gensec_krb5_session_info
,
841 .have_feature
= gensec_krb5_have_feature
,
844 .priority
= GENSEC_KRB5
847 static const struct gensec_security_ops gensec_krb5_security_ops
= {
849 .client_start
= gensec_krb5_client_start
,
850 .server_start
= gensec_krb5_server_start
,
851 .update
= gensec_krb5_update
,
852 .session_key
= gensec_krb5_session_key
,
853 .session_info
= gensec_krb5_session_info
,
854 .have_feature
= gensec_krb5_have_feature
,
855 .wrap
= gensec_krb5_wrap
,
856 .unwrap
= gensec_krb5_unwrap
,
859 .priority
= GENSEC_KRB5
862 _PUBLIC_ NTSTATUS
gensec_krb5_init(void)
866 ret
= gensec_register(&gensec_krb5_security_ops
);
867 if (!NT_STATUS_IS_OK(ret
)) {
868 DEBUG(0,("Failed to register '%s' gensec backend!\n",
869 gensec_krb5_security_ops
.name
));
873 ret
= gensec_register(&gensec_fake_gssapi_krb5_security_ops
);
874 if (!NT_STATUS_IS_OK(ret
)) {
875 DEBUG(0,("Failed to register '%s' gensec backend!\n",
876 gensec_krb5_security_ops
.name
));