2 Unix SMB/CIFS implementation.
4 Kerberos backend for GENSEC
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
7 Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "lib/events/events.h"
26 #include "system/kerberos.h"
27 #include "auth/kerberos/kerberos.h"
28 #include "librpc/gen_ndr/krb5pac.h"
29 #include "auth/auth.h"
31 #include "auth/auth_sam.h"
32 #include "librpc/rpc/dcerpc.h"
33 #include "auth/credentials/credentials.h"
34 #include "auth/credentials/credentials_krb5.h"
35 #include "auth/gensec/gensec.h"
36 #include "auth/gensec/gensec_proto.h"
37 #include "auth/gensec/gensec_toplevel_proto.h"
38 #include "param/param.h"
39 #include "auth/session_proto.h"
40 #include <gssapi/gssapi.h>
41 #include <gssapi/gssapi_krb5.h>
42 #include <gssapi/gssapi_spnego.h>
43 #include "gensec_gssapi.h"
44 #include "lib/util/util_net.h"
46 _PUBLIC_ NTSTATUS
gensec_gssapi_init(void);
48 static size_t gensec_gssapi_max_input_size(struct gensec_security
*gensec_security
);
49 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security
*gensec_security
);
51 static int gensec_gssapi_destructor(struct gensec_gssapi_state
*gensec_gssapi_state
)
53 OM_uint32 maj_stat
, min_stat
;
55 if (gensec_gssapi_state
->delegated_cred_handle
!= GSS_C_NO_CREDENTIAL
) {
56 maj_stat
= gss_release_cred(&min_stat
,
57 &gensec_gssapi_state
->delegated_cred_handle
);
60 if (gensec_gssapi_state
->gssapi_context
!= GSS_C_NO_CONTEXT
) {
61 maj_stat
= gss_delete_sec_context (&min_stat
,
62 &gensec_gssapi_state
->gssapi_context
,
66 if (gensec_gssapi_state
->server_name
!= GSS_C_NO_NAME
) {
67 maj_stat
= gss_release_name(&min_stat
, &gensec_gssapi_state
->server_name
);
69 if (gensec_gssapi_state
->client_name
!= GSS_C_NO_NAME
) {
70 maj_stat
= gss_release_name(&min_stat
, &gensec_gssapi_state
->client_name
);
73 if (gensec_gssapi_state
->lucid
) {
74 gss_krb5_free_lucid_sec_context(&min_stat
, gensec_gssapi_state
->lucid
);
80 static NTSTATUS
gensec_gssapi_init_lucid(struct gensec_gssapi_state
*gensec_gssapi_state
)
82 OM_uint32 maj_stat
, min_stat
;
84 if (gensec_gssapi_state
->lucid
) {
88 maj_stat
= gss_krb5_export_lucid_sec_context(&min_stat
,
89 &gensec_gssapi_state
->gssapi_context
,
91 (void **)&gensec_gssapi_state
->lucid
);
92 if (maj_stat
!= GSS_S_COMPLETE
) {
93 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
94 gssapi_error_string(gensec_gssapi_state
,
96 gensec_gssapi_state
->gss_oid
)));
97 return NT_STATUS_INTERNAL_ERROR
;
100 if (gensec_gssapi_state
->lucid
->version
!= 1) {
101 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
102 gensec_gssapi_state
->lucid
->version
));
103 gss_krb5_free_lucid_sec_context(&min_stat
, gensec_gssapi_state
->lucid
);
104 gensec_gssapi_state
->lucid
= NULL
;
105 return NT_STATUS_INTERNAL_ERROR
;
111 static NTSTATUS
gensec_gssapi_start(struct gensec_security
*gensec_security
)
113 struct gensec_gssapi_state
*gensec_gssapi_state
;
117 gensec_gssapi_state
= talloc_zero(gensec_security
, struct gensec_gssapi_state
);
118 if (!gensec_gssapi_state
) {
119 return NT_STATUS_NO_MEMORY
;
122 gensec_security
->private_data
= gensec_gssapi_state
;
124 gensec_gssapi_state
->gssapi_context
= GSS_C_NO_CONTEXT
;
126 /* TODO: Fill in channel bindings */
127 gensec_gssapi_state
->input_chan_bindings
= GSS_C_NO_CHANNEL_BINDINGS
;
129 gensec_gssapi_state
->server_name
= GSS_C_NO_NAME
;
130 gensec_gssapi_state
->client_name
= GSS_C_NO_NAME
;
132 gensec_gssapi_state
->gss_want_flags
= 0;
134 if (gensec_setting_bool(gensec_security
->settings
, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
135 gensec_gssapi_state
->gss_want_flags
|= GSS_C_DELEG_POLICY_FLAG
;
137 if (gensec_setting_bool(gensec_security
->settings
, "gensec_gssapi", "mutual", true)) {
138 gensec_gssapi_state
->gss_want_flags
|= GSS_C_MUTUAL_FLAG
;
140 if (gensec_setting_bool(gensec_security
->settings
, "gensec_gssapi", "delegation", true)) {
141 gensec_gssapi_state
->gss_want_flags
|= GSS_C_DELEG_FLAG
;
143 if (gensec_setting_bool(gensec_security
->settings
, "gensec_gssapi", "replay", true)) {
144 gensec_gssapi_state
->gss_want_flags
|= GSS_C_REPLAY_FLAG
;
146 if (gensec_setting_bool(gensec_security
->settings
, "gensec_gssapi", "sequence", true)) {
147 gensec_gssapi_state
->gss_want_flags
|= GSS_C_SEQUENCE_FLAG
;
150 if (gensec_security
->want_features
& GENSEC_FEATURE_SIGN
) {
151 gensec_gssapi_state
->gss_want_flags
|= GSS_C_INTEG_FLAG
;
153 if (gensec_security
->want_features
& GENSEC_FEATURE_SEAL
) {
154 gensec_gssapi_state
->gss_want_flags
|= GSS_C_INTEG_FLAG
;
155 gensec_gssapi_state
->gss_want_flags
|= GSS_C_CONF_FLAG
;
157 if (gensec_security
->want_features
& GENSEC_FEATURE_DCE_STYLE
) {
158 gensec_gssapi_state
->gss_want_flags
|= GSS_C_DCE_STYLE
;
161 gensec_gssapi_state
->gss_got_flags
= 0;
163 switch (gensec_security
->ops
->auth_type
) {
164 case DCERPC_AUTH_TYPE_SPNEGO
:
165 gensec_gssapi_state
->gss_oid
= gss_mech_spnego
;
167 case DCERPC_AUTH_TYPE_KRB5
:
169 gensec_gssapi_state
->gss_oid
= gss_mech_krb5
;
173 ret
= smb_krb5_init_context(gensec_gssapi_state
,
175 gensec_security
->settings
->lp_ctx
,
176 &gensec_gssapi_state
->smb_krb5_context
);
178 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
179 error_message(ret
)));
180 talloc_free(gensec_gssapi_state
);
181 return NT_STATUS_INTERNAL_ERROR
;
184 gensec_gssapi_state
->client_cred
= NULL
;
185 gensec_gssapi_state
->server_cred
= NULL
;
187 gensec_gssapi_state
->lucid
= NULL
;
189 gensec_gssapi_state
->delegated_cred_handle
= GSS_C_NO_CREDENTIAL
;
191 gensec_gssapi_state
->sasl
= false;
192 gensec_gssapi_state
->sasl_state
= STAGE_GSS_NEG
;
193 gensec_gssapi_state
->sasl_protection
= 0;
195 gensec_gssapi_state
->max_wrap_buf_size
196 = gensec_setting_int(gensec_security
->settings
, "gensec_gssapi", "max wrap buf size", 65536);
197 gensec_gssapi_state
->gss_exchange_count
= 0;
198 gensec_gssapi_state
->sig_size
= 0;
200 talloc_set_destructor(gensec_gssapi_state
, gensec_gssapi_destructor
);
202 realm
= lpcfg_realm(gensec_security
->settings
->lp_ctx
);
204 ret
= gsskrb5_set_default_realm(realm
);
206 DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
207 talloc_free(gensec_gssapi_state
);
208 return NT_STATUS_INTERNAL_ERROR
;
212 /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
213 ret
= gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security
->settings
, "krb5", "set_dns_canonicalize", false));
215 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
216 talloc_free(gensec_gssapi_state
);
217 return NT_STATUS_INTERNAL_ERROR
;
223 static NTSTATUS
gensec_gssapi_server_start(struct gensec_security
*gensec_security
)
227 struct gensec_gssapi_state
*gensec_gssapi_state
;
228 struct cli_credentials
*machine_account
;
229 struct gssapi_creds_container
*gcc
;
231 nt_status
= gensec_gssapi_start(gensec_security
);
232 if (!NT_STATUS_IS_OK(nt_status
)) {
236 gensec_gssapi_state
= talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
238 machine_account
= gensec_get_credentials(gensec_security
);
240 if (!machine_account
) {
241 DEBUG(3, ("No machine account credentials specified\n"));
242 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO
;
244 ret
= cli_credentials_get_server_gss_creds(machine_account
,
245 gensec_security
->settings
->lp_ctx
, &gcc
);
247 DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
248 error_message(ret
)));
249 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO
;
253 gensec_gssapi_state
->server_cred
= gcc
;
258 static NTSTATUS
gensec_gssapi_sasl_server_start(struct gensec_security
*gensec_security
)
261 struct gensec_gssapi_state
*gensec_gssapi_state
;
262 nt_status
= gensec_gssapi_server_start(gensec_security
);
264 if (NT_STATUS_IS_OK(nt_status
)) {
265 gensec_gssapi_state
= talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
266 gensec_gssapi_state
->sasl
= true;
271 static NTSTATUS
gensec_gssapi_client_creds(struct gensec_security
*gensec_security
,
272 struct tevent_context
*ev
)
274 struct gensec_gssapi_state
*gensec_gssapi_state
;
275 struct gssapi_creds_container
*gcc
;
276 struct cli_credentials
*creds
= gensec_get_credentials(gensec_security
);
277 const char *error_string
;
280 gensec_gssapi_state
= talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
282 /* Only run this the first time the update() call is made */
283 if (gensec_gssapi_state
->client_cred
) {
287 ret
= cli_credentials_get_client_gss_creds(creds
,
289 gensec_security
->settings
->lp_ctx
, &gcc
, &error_string
);
294 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state
->target_principal
, error_string
));
295 return NT_STATUS_INVALID_PARAMETER
;
296 case KRB5KDC_ERR_PREAUTH_FAILED
:
297 case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN
:
298 DEBUG(1, ("Wrong username or password: %s\n", error_string
));
299 return NT_STATUS_LOGON_FAILURE
;
300 case KRB5_KDC_UNREACH
:
301 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state
->target_principal
, error_string
));
302 return NT_STATUS_NO_LOGON_SERVERS
;
303 case KRB5_CC_NOTFOUND
:
305 DEBUG(2, ("Error obtaining ticket we require to contact %s: (possibly due to clock skew between us and the KDC) %s\n", gensec_gssapi_state
->target_principal
, error_string
));
306 return NT_STATUS_TIME_DIFFERENCE_AT_DC
;
308 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string
));
309 return NT_STATUS_UNSUCCESSFUL
;
312 gensec_gssapi_state
->client_cred
= gcc
;
313 if (!talloc_reference(gensec_gssapi_state
, gcc
)) {
314 return NT_STATUS_NO_MEMORY
;
320 static NTSTATUS
gensec_gssapi_client_start(struct gensec_security
*gensec_security
)
322 struct gensec_gssapi_state
*gensec_gssapi_state
;
323 struct cli_credentials
*creds
= gensec_get_credentials(gensec_security
);
325 gss_buffer_desc name_token
;
327 OM_uint32 maj_stat
, min_stat
;
328 const char *hostname
= gensec_get_target_hostname(gensec_security
);
331 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
332 return NT_STATUS_INVALID_PARAMETER
;
334 if (is_ipaddress(hostname
)) {
335 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
336 return NT_STATUS_INVALID_PARAMETER
;
338 if (strcmp(hostname
, "localhost") == 0) {
339 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
340 return NT_STATUS_INVALID_PARAMETER
;
343 nt_status
= gensec_gssapi_start(gensec_security
);
344 if (!NT_STATUS_IS_OK(nt_status
)) {
348 gensec_gssapi_state
= talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
350 if (cli_credentials_get_impersonate_principal(creds
)) {
351 gensec_gssapi_state
->gss_want_flags
&= ~(GSS_C_DELEG_FLAG
|GSS_C_DELEG_POLICY_FLAG
);
354 gensec_gssapi_state
->target_principal
= gensec_get_target_principal(gensec_security
);
355 if (gensec_gssapi_state
->target_principal
) {
356 name_type
= GSS_C_NULL_OID
;
358 gensec_gssapi_state
->target_principal
= talloc_asprintf(gensec_gssapi_state
, "%s/%s@%s",
359 gensec_get_target_service(gensec_security
),
360 hostname
, lpcfg_realm(gensec_security
->settings
->lp_ctx
));
362 name_type
= GSS_C_NT_USER_NAME
;
364 name_token
.value
= discard_const_p(uint8_t, gensec_gssapi_state
->target_principal
);
365 name_token
.length
= strlen(gensec_gssapi_state
->target_principal
);
368 maj_stat
= gss_import_name (&min_stat
,
371 &gensec_gssapi_state
->server_name
);
373 DEBUG(2, ("GSS Import name of %s failed: %s\n",
374 (char *)name_token
.value
,
375 gssapi_error_string(gensec_gssapi_state
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
376 return NT_STATUS_INVALID_PARAMETER
;
382 static NTSTATUS
gensec_gssapi_sasl_client_start(struct gensec_security
*gensec_security
)
385 struct gensec_gssapi_state
*gensec_gssapi_state
;
386 nt_status
= gensec_gssapi_client_start(gensec_security
);
388 if (NT_STATUS_IS_OK(nt_status
)) {
389 gensec_gssapi_state
= talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
390 gensec_gssapi_state
->sasl
= true;
397 * Check if the packet is one for this mechansim
399 * @param gensec_security GENSEC state
400 * @param in The request, as a DATA_BLOB
401 * @return Error, INVALID_PARAMETER if it's not a packet for us
402 * or NT_STATUS_OK if the packet is ok.
405 static NTSTATUS
gensec_gssapi_magic(struct gensec_security
*gensec_security
,
408 if (gensec_gssapi_check_oid(in
, GENSEC_OID_KERBEROS5
)) {
411 return NT_STATUS_INVALID_PARAMETER
;
417 * Next state function for the GSSAPI GENSEC mechanism
419 * @param gensec_gssapi_state GSSAPI State
420 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
421 * @param in The request, as a DATA_BLOB
422 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
423 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
424 * or NT_STATUS_OK if the user is authenticated.
427 static NTSTATUS
gensec_gssapi_update(struct gensec_security
*gensec_security
,
428 TALLOC_CTX
*out_mem_ctx
,
429 struct tevent_context
*ev
,
430 const DATA_BLOB in
, DATA_BLOB
*out
)
432 struct gensec_gssapi_state
*gensec_gssapi_state
433 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
434 NTSTATUS nt_status
= NT_STATUS_LOGON_FAILURE
;
435 OM_uint32 maj_stat
, min_stat
;
437 gss_buffer_desc input_token
, output_token
;
438 gss_OID gss_oid_p
= NULL
;
439 input_token
.length
= in
.length
;
440 input_token
.value
= in
.data
;
442 switch (gensec_gssapi_state
->sasl_state
) {
445 switch (gensec_security
->gensec_role
) {
448 struct gsskrb5_send_to_kdc send_to_kdc
;
451 nt_status
= gensec_gssapi_client_creds(gensec_security
, ev
);
452 if (!NT_STATUS_IS_OK(nt_status
)) {
456 send_to_kdc
.func
= smb_krb5_send_and_recv_func
;
457 send_to_kdc
.ptr
= ev
;
459 min_stat
= gsskrb5_set_send_to_kdc(&send_to_kdc
);
461 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
462 return NT_STATUS_INTERNAL_ERROR
;
465 maj_stat
= gss_init_sec_context(&min_stat
,
466 gensec_gssapi_state
->client_cred
->creds
,
467 &gensec_gssapi_state
->gssapi_context
,
468 gensec_gssapi_state
->server_name
,
469 gensec_gssapi_state
->gss_oid
,
470 gensec_gssapi_state
->gss_want_flags
,
472 gensec_gssapi_state
->input_chan_bindings
,
476 &gensec_gssapi_state
->gss_got_flags
, /* ret flags */
479 gensec_gssapi_state
->gss_oid
= gss_oid_p
;
482 send_to_kdc
.func
= smb_krb5_send_and_recv_func
;
483 send_to_kdc
.ptr
= NULL
;
485 ret
= gsskrb5_set_send_to_kdc(&send_to_kdc
);
487 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
488 return NT_STATUS_INTERNAL_ERROR
;
495 maj_stat
= gss_accept_sec_context(&min_stat
,
496 &gensec_gssapi_state
->gssapi_context
,
497 gensec_gssapi_state
->server_cred
->creds
,
499 gensec_gssapi_state
->input_chan_bindings
,
500 &gensec_gssapi_state
->client_name
,
503 &gensec_gssapi_state
->gss_got_flags
,
505 &gensec_gssapi_state
->delegated_cred_handle
);
507 gensec_gssapi_state
->gss_oid
= gss_oid_p
;
512 return NT_STATUS_INVALID_PARAMETER
;
516 gensec_gssapi_state
->gss_exchange_count
++;
518 if (maj_stat
== GSS_S_COMPLETE
) {
519 *out
= data_blob_talloc(out_mem_ctx
, output_token
.value
, output_token
.length
);
520 gss_release_buffer(&min_stat2
, &output_token
);
522 if (gensec_gssapi_state
->gss_got_flags
& GSS_C_DELEG_FLAG
) {
523 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
525 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
528 /* We may have been invoked as SASL, so there
529 * is more work to do */
530 if (gensec_gssapi_state
->sasl
) {
531 gensec_gssapi_state
->sasl_state
= STAGE_SASL_SSF_NEG
;
532 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
534 gensec_gssapi_state
->sasl_state
= STAGE_DONE
;
536 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
537 DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
538 } else if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SIGN
)) {
539 DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
541 DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
546 } else if (maj_stat
== GSS_S_CONTINUE_NEEDED
) {
547 *out
= data_blob_talloc(out_mem_ctx
, output_token
.value
, output_token
.length
);
548 gss_release_buffer(&min_stat2
, &output_token
);
550 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
551 } else if (maj_stat
== GSS_S_CONTEXT_EXPIRED
) {
554 gss_buffer_desc buffer
;
555 OM_uint32 lifetime
= 0;
556 gss_cred_usage_t usage
;
557 const char *role
= NULL
;
558 DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
560 gensec_gssapi_state
->gss_exchange_count
));
563 switch (gensec_security
->gensec_role
) {
565 creds
= gensec_gssapi_state
->client_cred
->creds
;
568 creds
= gensec_gssapi_state
->server_cred
->creds
;
572 maj_stat
= gss_inquire_cred(&min_stat
,
574 &name
, &lifetime
, &usage
, NULL
);
576 if (maj_stat
== GSS_S_COMPLETE
) {
577 const char *usage_string
;
580 usage_string
= "GSS_C_BOTH";
583 usage_string
= "GSS_C_ACCEPT";
586 usage_string
= "GSS_C_INITIATE";
589 maj_stat
= gss_display_name(&min_stat
, name
, &buffer
, NULL
);
595 DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
596 (int)buffer
.length
, (int)buffer
.length
, (char *)buffer
.value
,
597 lifetime
, usage_string
));
599 DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
600 (int)buffer
.length
, (int)buffer
.length
, (char *)buffer
.value
,
603 gss_release_buffer(&min_stat
, &buffer
);
604 gss_release_name(&min_stat
, &name
);
605 } else if (maj_stat
!= GSS_S_COMPLETE
) {
606 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
607 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
609 return NT_STATUS_INVALID_PARAMETER
;
610 } else if (gss_oid_equal(gensec_gssapi_state
->gss_oid
, gss_mech_krb5
)) {
612 case KRB5KRB_AP_ERR_TKT_NYV
:
613 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
614 gensec_gssapi_state
->target_principal
,
615 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
616 return NT_STATUS_TIME_DIFFERENCE_AT_DC
; /* Make SPNEGO ignore us, we can't go any further here */
617 case KRB5KRB_AP_ERR_TKT_EXPIRED
:
618 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
619 gensec_gssapi_state
->target_principal
,
620 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
621 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
622 case KRB5_KDC_UNREACH
:
623 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
624 gensec_gssapi_state
->target_principal
,
625 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
626 return NT_STATUS_NO_LOGON_SERVERS
; /* Make SPNEGO ignore us, we can't go any further here */
627 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
:
628 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
629 gensec_gssapi_state
->target_principal
,
630 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
631 return NT_STATUS_INVALID_PARAMETER
; /* Make SPNEGO ignore us, we can't go any further here */
632 case KRB5KRB_AP_ERR_MSG_TYPE
:
633 /* garbage input, possibly from the auto-mech detection */
634 return NT_STATUS_INVALID_PARAMETER
;
636 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
637 gensec_security
->gensec_role
== GENSEC_CLIENT
? "client" : "server",
638 gensec_gssapi_state
->gss_exchange_count
,
639 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
643 DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
644 gensec_security
->gensec_role
== GENSEC_CLIENT
? "client" : "server",
645 gensec_gssapi_state
->gss_exchange_count
,
646 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
652 /* These last two stages are only done if we were invoked as SASL */
653 case STAGE_SASL_SSF_NEG
:
655 switch (gensec_security
->gensec_role
) {
658 uint8_t maxlength_proposed
[4];
659 uint8_t maxlength_accepted
[4];
660 uint8_t security_supported
;
663 input_token
.length
= in
.length
;
664 input_token
.value
= in
.data
;
666 /* As a client, we have just send a
667 * zero-length blob to the server (after the
668 * normal GSSAPI exchange), and it has replied
669 * with it's SASL negotiation */
671 maj_stat
= gss_unwrap(&min_stat
,
672 gensec_gssapi_state
->gssapi_context
,
677 if (GSS_ERROR(maj_stat
)) {
678 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
679 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
680 return NT_STATUS_ACCESS_DENIED
;
683 if (output_token
.length
< 4) {
684 return NT_STATUS_INVALID_PARAMETER
;
687 memcpy(maxlength_proposed
, output_token
.value
, 4);
688 gss_release_buffer(&min_stat
, &output_token
);
690 /* first byte is the proposed security */
691 security_supported
= maxlength_proposed
[0];
692 maxlength_proposed
[0] = '\0';
694 /* Rest is the proposed max wrap length */
695 gensec_gssapi_state
->max_wrap_buf_size
= MIN(RIVAL(maxlength_proposed
, 0),
696 gensec_gssapi_state
->max_wrap_buf_size
);
697 gensec_gssapi_state
->sasl_protection
= 0;
698 if (security_supported
& NEG_SEAL
) {
699 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
700 gensec_gssapi_state
->sasl_protection
|= NEG_SEAL
;
703 if (security_supported
& NEG_SIGN
) {
704 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SIGN
)) {
705 gensec_gssapi_state
->sasl_protection
|= NEG_SIGN
;
708 if (security_supported
& NEG_NONE
) {
709 gensec_gssapi_state
->sasl_protection
|= NEG_NONE
;
711 if (gensec_gssapi_state
->sasl_protection
== 0) {
712 DEBUG(1, ("Remote server does not support unprotected connections\n"));
713 return NT_STATUS_ACCESS_DENIED
;
716 /* Send back the negotiated max length */
718 RSIVAL(maxlength_accepted
, 0, gensec_gssapi_state
->max_wrap_buf_size
);
720 maxlength_accepted
[0] = gensec_gssapi_state
->sasl_protection
;
722 input_token
.value
= maxlength_accepted
;
723 input_token
.length
= sizeof(maxlength_accepted
);
725 maj_stat
= gss_wrap(&min_stat
,
726 gensec_gssapi_state
->gssapi_context
,
732 if (GSS_ERROR(maj_stat
)) {
733 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
734 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
735 return NT_STATUS_ACCESS_DENIED
;
738 *out
= data_blob_talloc(out_mem_ctx
, output_token
.value
, output_token
.length
);
739 gss_release_buffer(&min_stat
, &output_token
);
741 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
742 gensec_gssapi_state
->sasl_state
= STAGE_DONE
;
744 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
745 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
746 } else if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SIGN
)) {
747 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
749 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
756 uint8_t maxlength_proposed
[4];
757 uint8_t security_supported
= 0x0;
760 /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
761 if (in
.length
!= 0) {
762 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
765 /* Give the client some idea what we will support */
767 RSIVAL(maxlength_proposed
, 0, gensec_gssapi_state
->max_wrap_buf_size
);
768 /* first byte is the proposed security */
769 maxlength_proposed
[0] = '\0';
771 gensec_gssapi_state
->sasl_protection
= 0;
772 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
773 security_supported
|= NEG_SEAL
;
775 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SIGN
)) {
776 security_supported
|= NEG_SIGN
;
778 if (security_supported
== 0) {
779 /* If we don't support anything, this must be 0 */
780 RSIVAL(maxlength_proposed
, 0, 0x0);
783 /* TODO: We may not wish to support this */
784 security_supported
|= NEG_NONE
;
785 maxlength_proposed
[0] = security_supported
;
787 input_token
.value
= maxlength_proposed
;
788 input_token
.length
= sizeof(maxlength_proposed
);
790 maj_stat
= gss_wrap(&min_stat
,
791 gensec_gssapi_state
->gssapi_context
,
797 if (GSS_ERROR(maj_stat
)) {
798 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
799 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
800 return NT_STATUS_ACCESS_DENIED
;
803 *out
= data_blob_talloc(out_mem_ctx
, output_token
.value
, output_token
.length
);
804 gss_release_buffer(&min_stat
, &output_token
);
806 gensec_gssapi_state
->sasl_state
= STAGE_SASL_SSF_ACCEPT
;
807 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
810 return NT_STATUS_INVALID_PARAMETER
;
814 /* This is s server-only stage */
815 case STAGE_SASL_SSF_ACCEPT
:
817 uint8_t maxlength_accepted
[4];
818 uint8_t security_accepted
;
821 input_token
.length
= in
.length
;
822 input_token
.value
= in
.data
;
824 maj_stat
= gss_unwrap(&min_stat
,
825 gensec_gssapi_state
->gssapi_context
,
830 if (GSS_ERROR(maj_stat
)) {
831 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
832 gssapi_error_string(out_mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
833 return NT_STATUS_ACCESS_DENIED
;
836 if (output_token
.length
< 4) {
837 return NT_STATUS_INVALID_PARAMETER
;
840 memcpy(maxlength_accepted
, output_token
.value
, 4);
841 gss_release_buffer(&min_stat
, &output_token
);
843 /* first byte is the proposed security */
844 security_accepted
= maxlength_accepted
[0];
845 maxlength_accepted
[0] = '\0';
847 /* Rest is the proposed max wrap length */
848 gensec_gssapi_state
->max_wrap_buf_size
= MIN(RIVAL(maxlength_accepted
, 0),
849 gensec_gssapi_state
->max_wrap_buf_size
);
851 gensec_gssapi_state
->sasl_protection
= 0;
852 if (security_accepted
& NEG_SEAL
) {
853 if (!gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
854 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
855 return NT_STATUS_ACCESS_DENIED
;
857 gensec_gssapi_state
->sasl_protection
|= NEG_SEAL
;
859 if (security_accepted
& NEG_SIGN
) {
860 if (!gensec_have_feature(gensec_security
, GENSEC_FEATURE_SIGN
)) {
861 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
862 return NT_STATUS_ACCESS_DENIED
;
864 gensec_gssapi_state
->sasl_protection
|= NEG_SIGN
;
866 if (security_accepted
& NEG_NONE
) {
867 gensec_gssapi_state
->sasl_protection
|= NEG_NONE
;
870 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
871 gensec_gssapi_state
->sasl_state
= STAGE_DONE
;
872 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)) {
873 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
874 } else if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SIGN
)) {
875 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
877 DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
880 *out
= data_blob(NULL
, 0);
884 return NT_STATUS_INVALID_PARAMETER
;
888 static NTSTATUS
gensec_gssapi_wrap(struct gensec_security
*gensec_security
,
893 struct gensec_gssapi_state
*gensec_gssapi_state
894 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
895 OM_uint32 maj_stat
, min_stat
;
896 gss_buffer_desc input_token
, output_token
;
898 input_token
.length
= in
->length
;
899 input_token
.value
= in
->data
;
901 maj_stat
= gss_wrap(&min_stat
,
902 gensec_gssapi_state
->gssapi_context
,
903 gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
),
908 if (GSS_ERROR(maj_stat
)) {
909 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
910 gssapi_error_string(mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
911 return NT_STATUS_ACCESS_DENIED
;
914 *out
= data_blob_talloc(mem_ctx
, output_token
.value
, output_token
.length
);
915 gss_release_buffer(&min_stat
, &output_token
);
917 if (gensec_gssapi_state
->sasl
) {
918 size_t max_wrapped_size
= gensec_gssapi_max_wrapped_size(gensec_security
);
919 if (max_wrapped_size
< out
->length
) {
920 DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
921 (unsigned)in
->length
,
922 (unsigned)out
->length
,
923 (unsigned int)max_wrapped_size
));
924 return NT_STATUS_INVALID_PARAMETER
;
928 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)
930 return NT_STATUS_ACCESS_DENIED
;
935 static NTSTATUS
gensec_gssapi_unwrap(struct gensec_security
*gensec_security
,
940 struct gensec_gssapi_state
*gensec_gssapi_state
941 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
942 OM_uint32 maj_stat
, min_stat
;
943 gss_buffer_desc input_token
, output_token
;
946 input_token
.length
= in
->length
;
947 input_token
.value
= in
->data
;
949 if (gensec_gssapi_state
->sasl
) {
950 size_t max_wrapped_size
= gensec_gssapi_max_wrapped_size(gensec_security
);
951 if (max_wrapped_size
< in
->length
) {
952 DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
953 return NT_STATUS_INVALID_PARAMETER
;
957 maj_stat
= gss_unwrap(&min_stat
,
958 gensec_gssapi_state
->gssapi_context
,
963 if (GSS_ERROR(maj_stat
)) {
964 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
965 gssapi_error_string(mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
966 return NT_STATUS_ACCESS_DENIED
;
969 *out
= data_blob_talloc(mem_ctx
, output_token
.value
, output_token
.length
);
970 gss_release_buffer(&min_stat
, &output_token
);
972 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)
974 return NT_STATUS_ACCESS_DENIED
;
979 /* Find out the maximum input size negotiated on this connection */
981 static size_t gensec_gssapi_max_input_size(struct gensec_security
*gensec_security
)
983 struct gensec_gssapi_state
*gensec_gssapi_state
984 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
985 OM_uint32 maj_stat
, min_stat
;
986 OM_uint32 max_input_size
;
988 maj_stat
= gss_wrap_size_limit(&min_stat
,
989 gensec_gssapi_state
->gssapi_context
,
990 gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
),
992 gensec_gssapi_state
->max_wrap_buf_size
,
994 if (GSS_ERROR(maj_stat
)) {
995 TALLOC_CTX
*mem_ctx
= talloc_new(NULL
);
996 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
997 gssapi_error_string(mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
998 talloc_free(mem_ctx
);
1002 return max_input_size
;
1005 /* Find out the maximum output size negotiated on this connection */
1006 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security
*gensec_security
)
1008 struct gensec_gssapi_state
*gensec_gssapi_state
= talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);;
1009 return gensec_gssapi_state
->max_wrap_buf_size
;
1012 static NTSTATUS
gensec_gssapi_seal_packet(struct gensec_security
*gensec_security
,
1013 TALLOC_CTX
*mem_ctx
,
1014 uint8_t *data
, size_t length
,
1015 const uint8_t *whole_pdu
, size_t pdu_length
,
1018 struct gensec_gssapi_state
*gensec_gssapi_state
1019 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
1020 OM_uint32 maj_stat
, min_stat
;
1021 gss_buffer_desc input_token
, output_token
;
1025 input_token
.length
= length
;
1026 input_token
.value
= data
;
1028 maj_stat
= gss_wrap(&min_stat
,
1029 gensec_gssapi_state
->gssapi_context
,
1030 gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
),
1035 if (GSS_ERROR(maj_stat
)) {
1036 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1037 gssapi_error_string(mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
1038 return NT_STATUS_ACCESS_DENIED
;
1041 if (output_token
.length
< input_token
.length
) {
1042 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1043 (long)output_token
.length
, (long)length
));
1044 return NT_STATUS_INTERNAL_ERROR
;
1046 sig_length
= output_token
.length
- input_token
.length
;
1048 memcpy(data
, ((uint8_t *)output_token
.value
) + sig_length
, length
);
1049 *sig
= data_blob_talloc(mem_ctx
, (uint8_t *)output_token
.value
, sig_length
);
1051 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig
->data
, sig
->length
);
1052 dump_data_pw("gensec_gssapi_seal_packet: clear\n", data
, length
);
1053 dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token
.value
) + sig_length
, output_token
.length
- sig_length
);
1055 gss_release_buffer(&min_stat
, &output_token
);
1057 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)
1059 return NT_STATUS_ACCESS_DENIED
;
1061 return NT_STATUS_OK
;
1064 static NTSTATUS
gensec_gssapi_unseal_packet(struct gensec_security
*gensec_security
,
1065 uint8_t *data
, size_t length
,
1066 const uint8_t *whole_pdu
, size_t pdu_length
,
1067 const DATA_BLOB
*sig
)
1069 struct gensec_gssapi_state
*gensec_gssapi_state
1070 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
1071 OM_uint32 maj_stat
, min_stat
;
1072 gss_buffer_desc input_token
, output_token
;
1074 gss_qop_t qop_state
;
1077 dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig
->data
, sig
->length
);
1079 in
= data_blob_talloc(gensec_security
, NULL
, sig
->length
+ length
);
1081 memcpy(in
.data
, sig
->data
, sig
->length
);
1082 memcpy(in
.data
+ sig
->length
, data
, length
);
1084 input_token
.length
= in
.length
;
1085 input_token
.value
= in
.data
;
1087 maj_stat
= gss_unwrap(&min_stat
,
1088 gensec_gssapi_state
->gssapi_context
,
1093 talloc_free(in
.data
);
1094 if (GSS_ERROR(maj_stat
)) {
1095 char *error_string
= gssapi_error_string(NULL
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
);
1096 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1098 talloc_free(error_string
);
1099 return NT_STATUS_ACCESS_DENIED
;
1102 if (output_token
.length
!= length
) {
1103 return NT_STATUS_INTERNAL_ERROR
;
1106 memcpy(data
, output_token
.value
, length
);
1108 gss_release_buffer(&min_stat
, &output_token
);
1110 if (gensec_have_feature(gensec_security
, GENSEC_FEATURE_SEAL
)
1112 return NT_STATUS_ACCESS_DENIED
;
1114 return NT_STATUS_OK
;
1117 static NTSTATUS
gensec_gssapi_sign_packet(struct gensec_security
*gensec_security
,
1118 TALLOC_CTX
*mem_ctx
,
1119 const uint8_t *data
, size_t length
,
1120 const uint8_t *whole_pdu
, size_t pdu_length
,
1123 struct gensec_gssapi_state
*gensec_gssapi_state
1124 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
1125 OM_uint32 maj_stat
, min_stat
;
1126 gss_buffer_desc input_token
, output_token
;
1128 if (gensec_security
->want_features
& GENSEC_FEATURE_SIGN_PKT_HEADER
) {
1129 input_token
.length
= pdu_length
;
1130 input_token
.value
= discard_const_p(uint8_t *, whole_pdu
);
1132 input_token
.length
= length
;
1133 input_token
.value
= discard_const_p(uint8_t *, data
);
1136 maj_stat
= gss_get_mic(&min_stat
,
1137 gensec_gssapi_state
->gssapi_context
,
1141 if (GSS_ERROR(maj_stat
)) {
1142 DEBUG(1, ("GSS GetMic failed: %s\n",
1143 gssapi_error_string(mem_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
1144 return NT_STATUS_ACCESS_DENIED
;
1147 *sig
= data_blob_talloc(mem_ctx
, (uint8_t *)output_token
.value
, output_token
.length
);
1149 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig
->data
, sig
->length
);
1151 gss_release_buffer(&min_stat
, &output_token
);
1153 return NT_STATUS_OK
;
1156 static NTSTATUS
gensec_gssapi_check_packet(struct gensec_security
*gensec_security
,
1157 const uint8_t *data
, size_t length
,
1158 const uint8_t *whole_pdu
, size_t pdu_length
,
1159 const DATA_BLOB
*sig
)
1161 struct gensec_gssapi_state
*gensec_gssapi_state
1162 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
1163 OM_uint32 maj_stat
, min_stat
;
1164 gss_buffer_desc input_token
;
1165 gss_buffer_desc input_message
;
1166 gss_qop_t qop_state
;
1168 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig
->data
, sig
->length
);
1170 if (gensec_security
->want_features
& GENSEC_FEATURE_SIGN_PKT_HEADER
) {
1171 input_message
.length
= pdu_length
;
1172 input_message
.value
= discard_const(whole_pdu
);
1174 input_message
.length
= length
;
1175 input_message
.value
= discard_const(data
);
1178 input_token
.length
= sig
->length
;
1179 input_token
.value
= sig
->data
;
1181 maj_stat
= gss_verify_mic(&min_stat
,
1182 gensec_gssapi_state
->gssapi_context
,
1186 if (GSS_ERROR(maj_stat
)) {
1187 char *error_string
= gssapi_error_string(NULL
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
);
1188 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string
));
1189 talloc_free(error_string
);
1191 return NT_STATUS_ACCESS_DENIED
;
1194 return NT_STATUS_OK
;
1197 /* Try to figure out what features we actually got on the connection */
1198 static bool gensec_gssapi_have_feature(struct gensec_security
*gensec_security
,
1201 struct gensec_gssapi_state
*gensec_gssapi_state
1202 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
1203 if (feature
& GENSEC_FEATURE_SIGN
) {
1204 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1205 if (gensec_gssapi_state
->sasl
1206 && gensec_gssapi_state
->sasl_state
== STAGE_DONE
) {
1207 return ((gensec_gssapi_state
->sasl_protection
& NEG_SIGN
)
1208 && (gensec_gssapi_state
->gss_got_flags
& GSS_C_INTEG_FLAG
));
1210 return gensec_gssapi_state
->gss_got_flags
& GSS_C_INTEG_FLAG
;
1212 if (feature
& GENSEC_FEATURE_SEAL
) {
1213 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1214 if (gensec_gssapi_state
->sasl
1215 && gensec_gssapi_state
->sasl_state
== STAGE_DONE
) {
1216 return ((gensec_gssapi_state
->sasl_protection
& NEG_SEAL
)
1217 && (gensec_gssapi_state
->gss_got_flags
& GSS_C_CONF_FLAG
));
1219 return gensec_gssapi_state
->gss_got_flags
& GSS_C_CONF_FLAG
;
1221 if (feature
& GENSEC_FEATURE_SESSION_KEY
) {
1222 /* Only for GSSAPI/Krb5 */
1223 if (gss_oid_equal(gensec_gssapi_state
->gss_oid
, gss_mech_krb5
)) {
1227 if (feature
& GENSEC_FEATURE_DCE_STYLE
) {
1228 return gensec_gssapi_state
->gss_got_flags
& GSS_C_DCE_STYLE
;
1230 if (feature
& GENSEC_FEATURE_NEW_SPNEGO
) {
1234 if (!(gensec_gssapi_state
->gss_got_flags
& GSS_C_INTEG_FLAG
)) {
1238 if (gensec_setting_bool(gensec_security
->settings
, "gensec_gssapi", "force_new_spnego", false)) {
1241 if (gensec_setting_bool(gensec_security
->settings
, "gensec_gssapi", "disable_new_spnego", false)) {
1245 status
= gssapi_get_session_key(gensec_gssapi_state
,
1246 gensec_gssapi_state
->gssapi_context
, NULL
, &keytype
);
1248 * We should do a proper sig on the mechListMic unless
1249 * we know we have to be backwards compatible with
1250 * earlier windows versions.
1252 * Negotiating a non-krb5
1253 * mech for example should be regarded as having
1256 if (NT_STATUS_IS_OK(status
)) {
1258 case ENCTYPE_DES_CBC_CRC
:
1259 case ENCTYPE_DES_CBC_MD5
:
1260 case ENCTYPE_ARCFOUR_HMAC
:
1261 case ENCTYPE_DES3_CBC_SHA1
:
1267 /* We can always do async (rather than strict request/reply) packets. */
1268 if (feature
& GENSEC_FEATURE_ASYNC_REPLIES
) {
1275 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1276 * (for encrypting some passwords).
1278 * This breaks all the abstractions, but what do you expect...
1280 static NTSTATUS
gensec_gssapi_session_key(struct gensec_security
*gensec_security
,
1281 TALLOC_CTX
*mem_ctx
,
1282 DATA_BLOB
*session_key
)
1284 struct gensec_gssapi_state
*gensec_gssapi_state
1285 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
1286 return gssapi_get_session_key(mem_ctx
, gensec_gssapi_state
->gssapi_context
, session_key
, NULL
);
1289 /* Get some basic (and authorization) information about the user on
1290 * this session. This uses either the PAC (if present) or a local
1291 * database lookup */
1292 static NTSTATUS
gensec_gssapi_session_info(struct gensec_security
*gensec_security
,
1293 TALLOC_CTX
*mem_ctx
,
1294 struct auth_session_info
**_session_info
)
1297 TALLOC_CTX
*tmp_ctx
;
1298 struct gensec_gssapi_state
*gensec_gssapi_state
1299 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
1300 struct auth_session_info
*session_info
= NULL
;
1301 OM_uint32 maj_stat
, min_stat
;
1302 DATA_BLOB pac_blob
, *pac_blob_ptr
= NULL
;
1304 gss_buffer_desc name_token
;
1305 char *principal_string
;
1307 tmp_ctx
= talloc_named(mem_ctx
, 0, "gensec_gssapi_session_info context");
1308 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx
);
1310 maj_stat
= gss_display_name (&min_stat
,
1311 gensec_gssapi_state
->client_name
,
1314 if (GSS_ERROR(maj_stat
)) {
1315 DEBUG(1, ("GSS display_name failed: %s\n",
1316 gssapi_error_string(tmp_ctx
, maj_stat
, min_stat
, gensec_gssapi_state
->gss_oid
)));
1317 talloc_free(tmp_ctx
);
1318 return NT_STATUS_FOOBAR
;
1321 principal_string
= talloc_strndup(tmp_ctx
,
1322 (const char *)name_token
.value
,
1325 gss_release_buffer(&min_stat
, &name_token
);
1327 if (!principal_string
) {
1328 talloc_free(tmp_ctx
);
1329 return NT_STATUS_NO_MEMORY
;
1332 nt_status
= gssapi_obtain_pac_blob(tmp_ctx
, gensec_gssapi_state
->gssapi_context
,
1333 gensec_gssapi_state
->client_name
,
1336 /* IF we have the PAC - otherwise we need to get this
1337 * data from elsewere - local ldb, or (TODO) lookup of some
1340 if (NT_STATUS_IS_OK(nt_status
)) {
1341 pac_blob_ptr
= &pac_blob
;
1343 nt_status
= gensec_generate_session_info_pac(tmp_ctx
,
1345 gensec_gssapi_state
->smb_krb5_context
,
1346 pac_blob_ptr
, principal_string
,
1347 gensec_get_remote_address(gensec_security
),
1349 if (!NT_STATUS_IS_OK(nt_status
)) {
1350 talloc_free(tmp_ctx
);
1354 nt_status
= gensec_gssapi_session_key(gensec_security
, session_info
, &session_info
->session_key
);
1355 if (!NT_STATUS_IS_OK(nt_status
)) {
1356 talloc_free(tmp_ctx
);
1360 if (!(gensec_gssapi_state
->gss_got_flags
& GSS_C_DELEG_FLAG
)) {
1361 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1363 krb5_error_code ret
;
1364 const char *error_string
;
1366 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1367 session_info
->credentials
= cli_credentials_init(session_info
);
1368 if (!session_info
->credentials
) {
1369 talloc_free(tmp_ctx
);
1370 return NT_STATUS_NO_MEMORY
;
1373 cli_credentials_set_conf(session_info
->credentials
, gensec_security
->settings
->lp_ctx
);
1374 /* Just so we don't segfault trying to get at a username */
1375 cli_credentials_set_anonymous(session_info
->credentials
);
1377 ret
= cli_credentials_set_client_gss_creds(session_info
->credentials
,
1378 gensec_security
->settings
->lp_ctx
,
1379 gensec_gssapi_state
->delegated_cred_handle
,
1380 CRED_SPECIFIED
, &error_string
);
1382 talloc_free(tmp_ctx
);
1383 DEBUG(2,("Failed to get gss creds: %s\n", error_string
));
1384 return NT_STATUS_NO_MEMORY
;
1387 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1388 cli_credentials_set_kerberos_state(session_info
->credentials
, CRED_MUST_USE_KERBEROS
);
1390 /* It has been taken from this place... */
1391 gensec_gssapi_state
->delegated_cred_handle
= GSS_C_NO_CREDENTIAL
;
1393 *_session_info
= talloc_steal(mem_ctx
, session_info
);
1394 talloc_free(tmp_ctx
);
1396 return NT_STATUS_OK
;
1399 static size_t gensec_gssapi_sig_size(struct gensec_security
*gensec_security
, size_t data_size
)
1401 struct gensec_gssapi_state
*gensec_gssapi_state
1402 = talloc_get_type(gensec_security
->private_data
, struct gensec_gssapi_state
);
1405 if (gensec_gssapi_state
->sig_size
) {
1406 return gensec_gssapi_state
->sig_size
;
1409 if (gensec_gssapi_state
->gss_got_flags
& GSS_C_CONF_FLAG
) {
1410 gensec_gssapi_state
->sig_size
= 45;
1412 gensec_gssapi_state
->sig_size
= 37;
1415 status
= gensec_gssapi_init_lucid(gensec_gssapi_state
);
1416 if (!NT_STATUS_IS_OK(status
)) {
1417 return gensec_gssapi_state
->sig_size
;
1420 if (gensec_gssapi_state
->lucid
->protocol
== 1) {
1421 if (gensec_gssapi_state
->gss_got_flags
& GSS_C_CONF_FLAG
) {
1423 * TODO: windows uses 76 here, but we don't know
1424 * gss_wrap works with aes keys yet
1426 gensec_gssapi_state
->sig_size
= 76;
1428 gensec_gssapi_state
->sig_size
= 28;
1430 } else if (gensec_gssapi_state
->lucid
->protocol
== 0) {
1431 switch (gensec_gssapi_state
->lucid
->rfc1964_kd
.ctx_key
.type
) {
1433 case KEYTYPE_ARCFOUR
:
1434 case KEYTYPE_ARCFOUR_56
:
1435 if (gensec_gssapi_state
->gss_got_flags
& GSS_C_CONF_FLAG
) {
1436 gensec_gssapi_state
->sig_size
= 45;
1438 gensec_gssapi_state
->sig_size
= 37;
1442 if (gensec_gssapi_state
->gss_got_flags
& GSS_C_CONF_FLAG
) {
1443 gensec_gssapi_state
->sig_size
= 57;
1445 gensec_gssapi_state
->sig_size
= 49;
1451 return gensec_gssapi_state
->sig_size
;
1454 static const char *gensec_gssapi_krb5_oids
[] = {
1455 GENSEC_OID_KERBEROS5_OLD
,
1456 GENSEC_OID_KERBEROS5
,
1460 static const char *gensec_gssapi_spnego_oids
[] = {
1465 /* As a server, this could in theory accept any GSSAPI mech */
1466 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops
= {
1467 .name
= "gssapi_spnego",
1468 .sasl_name
= "GSS-SPNEGO",
1469 .auth_type
= DCERPC_AUTH_TYPE_SPNEGO
,
1470 .oid
= gensec_gssapi_spnego_oids
,
1471 .client_start
= gensec_gssapi_client_start
,
1472 .server_start
= gensec_gssapi_server_start
,
1473 .magic
= gensec_gssapi_magic
,
1474 .update
= gensec_gssapi_update
,
1475 .session_key
= gensec_gssapi_session_key
,
1476 .session_info
= gensec_gssapi_session_info
,
1477 .sign_packet
= gensec_gssapi_sign_packet
,
1478 .check_packet
= gensec_gssapi_check_packet
,
1479 .seal_packet
= gensec_gssapi_seal_packet
,
1480 .unseal_packet
= gensec_gssapi_unseal_packet
,
1481 .wrap
= gensec_gssapi_wrap
,
1482 .unwrap
= gensec_gssapi_unwrap
,
1483 .have_feature
= gensec_gssapi_have_feature
,
1486 .priority
= GENSEC_GSSAPI
1489 /* As a server, this could in theory accept any GSSAPI mech */
1490 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops
= {
1491 .name
= "gssapi_krb5",
1492 .auth_type
= DCERPC_AUTH_TYPE_KRB5
,
1493 .oid
= gensec_gssapi_krb5_oids
,
1494 .client_start
= gensec_gssapi_client_start
,
1495 .server_start
= gensec_gssapi_server_start
,
1496 .magic
= gensec_gssapi_magic
,
1497 .update
= gensec_gssapi_update
,
1498 .session_key
= gensec_gssapi_session_key
,
1499 .session_info
= gensec_gssapi_session_info
,
1500 .sig_size
= gensec_gssapi_sig_size
,
1501 .sign_packet
= gensec_gssapi_sign_packet
,
1502 .check_packet
= gensec_gssapi_check_packet
,
1503 .seal_packet
= gensec_gssapi_seal_packet
,
1504 .unseal_packet
= gensec_gssapi_unseal_packet
,
1505 .wrap
= gensec_gssapi_wrap
,
1506 .unwrap
= gensec_gssapi_unwrap
,
1507 .have_feature
= gensec_gssapi_have_feature
,
1510 .priority
= GENSEC_GSSAPI
1513 /* As a server, this could in theory accept any GSSAPI mech */
1514 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops
= {
1515 .name
= "gssapi_krb5_sasl",
1516 .sasl_name
= "GSSAPI",
1517 .client_start
= gensec_gssapi_sasl_client_start
,
1518 .server_start
= gensec_gssapi_sasl_server_start
,
1519 .update
= gensec_gssapi_update
,
1520 .session_key
= gensec_gssapi_session_key
,
1521 .session_info
= gensec_gssapi_session_info
,
1522 .max_input_size
= gensec_gssapi_max_input_size
,
1523 .max_wrapped_size
= gensec_gssapi_max_wrapped_size
,
1524 .wrap
= gensec_gssapi_wrap
,
1525 .unwrap
= gensec_gssapi_unwrap
,
1526 .have_feature
= gensec_gssapi_have_feature
,
1529 .priority
= GENSEC_GSSAPI
1532 _PUBLIC_ NTSTATUS
gensec_gssapi_init(void)
1536 ret
= gensec_register(&gensec_gssapi_spnego_security_ops
);
1537 if (!NT_STATUS_IS_OK(ret
)) {
1538 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1539 gensec_gssapi_spnego_security_ops
.name
));
1543 ret
= gensec_register(&gensec_gssapi_krb5_security_ops
);
1544 if (!NT_STATUS_IS_OK(ret
)) {
1545 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1546 gensec_gssapi_krb5_security_ops
.name
));
1550 ret
= gensec_register(&gensec_gssapi_sasl_krb5_security_ops
);
1551 if (!NT_STATUS_IS_OK(ret
)) {
1552 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1553 gensec_gssapi_sasl_krb5_security_ops
.name
));