2 * GSSAPI Security Extensions
3 * RPC Pipe client and server routines
4 * Copyright (C) Simo Sorce 2010.
5 * Copyright (C) Andrew Bartlett 2004-2011.
6 * Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
22 /* We support only GSSAPI/KRB5 here */
26 #include "libads/kerberos_proto.h"
27 #include "auth/common_auth.h"
28 #include "auth/gensec/gensec.h"
29 #include "auth/credentials/credentials.h"
30 #include "../librpc/gen_ndr/dcerpc.h"
32 #if defined(HAVE_KRB5) && defined(HAVE_GSS_WRAP_IOV)
37 #ifndef GSS_C_DCE_STYLE
38 #define GSS_C_DCE_STYLE 0x1000
41 #ifndef GSS_KRB5_INQ_SSPI_SESSION_KEY_OID
42 #define GSS_KRB5_INQ_SSPI_SESSION_KEY_OID_LENGTH 11
43 #define GSS_KRB5_INQ_SSPI_SESSION_KEY_OID "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x05\x05"
46 gss_OID_desc gse_sesskey_inq_oid = {
47 GSS_KRB5_INQ_SSPI_SESSION_KEY_OID_LENGTH,
48 (void *)GSS_KRB5_INQ_SSPI_SESSION_KEY_OID
51 #ifndef GSS_KRB5_SESSION_KEY_ENCTYPE_OID
52 #define GSS_KRB5_SESSION_KEY_ENCTYPE_OID_LENGTH 10
53 #define GSS_KRB5_SESSION_KEY_ENCTYPE_OID "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04"
56 gss_OID_desc gse_sesskeytype_oid = {
57 GSS_KRB5_SESSION_KEY_ENCTYPE_OID_LENGTH,
58 (void *)GSS_KRB5_SESSION_KEY_ENCTYPE_OID
61 #define GSE_EXTRACT_RELEVANT_AUTHZ_DATA_OID_LENGTH 12
62 /* EXTRACTION OID AUTHZ ID */
63 #define GSE_EXTRACT_RELEVANT_AUTHZ_DATA_OID "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x05\x0a" "\x01"
65 gss_OID_desc gse_authz_data_oid = {
66 GSE_EXTRACT_RELEVANT_AUTHZ_DATA_OID_LENGTH,
67 (void *)GSE_EXTRACT_RELEVANT_AUTHZ_DATA_OID
70 static char *gse_errstr(TALLOC_CTX *mem_ctx, OM_uint32 maj, OM_uint32 min);
79 gss_OID_desc gss_mech;
80 OM_uint32 gss_c_flags;
82 gss_name_t server_name;
86 gss_cred_id_t delegated_creds;
87 gss_name_t client_name;
93 #ifndef HAVE_GSS_OID_EQUAL
95 static bool gss_oid_equal(const gss_OID o1, const gss_OID o2)
100 if ((o1 == NULL && o2 != NULL) || (o1 != NULL && o2 == NULL)) {
103 if (o1->length != o2->length) {
106 return memcmp(o1->elements, o2->elements, o1->length) == false;
111 /* free non talloc dependent contexts */
112 static int gse_context_destructor(void *ptr)
114 struct gse_context *gse_ctx;
115 OM_uint32 gss_min, gss_maj;
117 gse_ctx = talloc_get_type_abort(ptr, struct gse_context);
118 if (gse_ctx->k5ctx) {
119 if (gse_ctx->ccache) {
120 krb5_cc_close(gse_ctx->k5ctx, gse_ctx->ccache);
121 gse_ctx->ccache = NULL;
123 if (gse_ctx->keytab) {
124 krb5_kt_close(gse_ctx->k5ctx, gse_ctx->keytab);
125 gse_ctx->keytab = NULL;
127 krb5_free_context(gse_ctx->k5ctx);
128 gse_ctx->k5ctx = NULL;
130 if (gse_ctx->gss_ctx != GSS_C_NO_CONTEXT) {
131 gss_maj = gss_delete_sec_context(&gss_min,
135 if (gse_ctx->server_name) {
136 gss_maj = gss_release_name(&gss_min,
137 &gse_ctx->server_name);
139 if (gse_ctx->client_name) {
140 gss_maj = gss_release_name(&gss_min,
141 &gse_ctx->client_name);
143 if (gse_ctx->creds) {
144 gss_maj = gss_release_cred(&gss_min,
147 if (gse_ctx->delegated_creds) {
148 gss_maj = gss_release_cred(&gss_min,
149 &gse_ctx->delegated_creds);
152 /* MIT and Heimdal differ as to if you can call
153 * gss_release_oid() on this OID, generated by
154 * gss_{accept,init}_sec_context(). However, as long as the
155 * oid is gss_mech_krb5 (which it always is at the moment),
156 * then this is a moot point, as both declare this particular
157 * OID static, and so no memory is lost. This assert is in
158 * place to ensure that the programmer who wishes to extend
159 * this code to EAP or other GSS mechanisms determines an
160 * implementation-dependent way of releasing any dynamically
162 SMB_ASSERT(gss_oid_equal(&gse_ctx->gss_mech, GSS_C_NO_OID) || gss_oid_equal(&gse_ctx->gss_mech, gss_mech_krb5));
167 static NTSTATUS gse_context_init(TALLOC_CTX *mem_ctx,
168 bool do_sign, bool do_seal,
169 const char *ccache_name,
170 uint32_t add_gss_c_flags,
171 struct gse_context **_gse_ctx)
173 struct gse_context *gse_ctx;
174 krb5_error_code k5ret;
177 gse_ctx = talloc_zero(mem_ctx, struct gse_context);
179 return NT_STATUS_NO_MEMORY;
181 talloc_set_destructor((TALLOC_CTX *)gse_ctx, gse_context_destructor);
183 memcpy(&gse_ctx->gss_mech, gss_mech_krb5, sizeof(gss_OID_desc));
185 gse_ctx->gss_c_flags = GSS_C_MUTUAL_FLAG |
187 GSS_C_DELEG_POLICY_FLAG |
191 gse_ctx->gss_c_flags |= GSS_C_INTEG_FLAG;
194 gse_ctx->gss_c_flags |= GSS_C_CONF_FLAG;
197 gse_ctx->gss_c_flags |= add_gss_c_flags;
199 /* Initialize Kerberos Context */
200 initialize_krb5_error_table();
202 k5ret = krb5_init_context(&gse_ctx->k5ctx);
204 DEBUG(0, ("Failed to initialize kerberos context! (%s)\n",
205 error_message(k5ret)));
206 status = NT_STATUS_INTERNAL_ERROR;
211 ccache_name = krb5_cc_default_name(gse_ctx->k5ctx);
213 k5ret = krb5_cc_resolve(gse_ctx->k5ctx, ccache_name,
216 DEBUG(1, ("Failed to resolve credential cache! (%s)\n",
217 error_message(k5ret)));
218 status = NT_STATUS_INTERNAL_ERROR;
222 /* TODO: Should we enforce a enc_types list ?
223 ret = krb5_set_default_tgs_ktypes(gse_ctx->k5ctx, enc_types);
230 TALLOC_FREE(gse_ctx);
234 static NTSTATUS gse_init_client(TALLOC_CTX *mem_ctx,
235 bool do_sign, bool do_seal,
236 const char *ccache_name,
239 const char *username,
240 const char *password,
241 uint32_t add_gss_c_flags,
242 struct gse_context **_gse_ctx)
244 struct gse_context *gse_ctx;
245 OM_uint32 gss_maj, gss_min;
246 gss_buffer_desc name_buffer = {0, NULL};
247 gss_OID_set_desc mech_set;
250 if (!server || !service) {
251 return NT_STATUS_INVALID_PARAMETER;
254 status = gse_context_init(mem_ctx, do_sign, do_seal,
255 ccache_name, add_gss_c_flags,
257 if (!NT_STATUS_IS_OK(status)) {
258 return NT_STATUS_NO_MEMORY;
261 /* Guess the realm based on the supplied service, and avoid the GSS libs
262 doing DNS lookups which may fail.
264 TODO: Loop with the KDC on some more combinations (local
265 realm in particular), possibly falling back to
266 GSS_C_NT_HOSTBASED_SERVICE
268 name_buffer.value = kerberos_get_principal_from_service_hostname(gse_ctx,
270 if (!name_buffer.value) {
271 status = NT_STATUS_NO_MEMORY;
274 name_buffer.length = strlen((char *)name_buffer.value);
275 gss_maj = gss_import_name(&gss_min, &name_buffer,
277 &gse_ctx->server_name);
279 DEBUG(0, ("gss_import_name failed for %s, with [%s]\n",
280 (char *)name_buffer.value,
281 gse_errstr(gse_ctx, gss_maj, gss_min)));
282 status = NT_STATUS_INTERNAL_ERROR;
286 /* TODO: get krb5 ticket using username/password, if no valid
287 * one already available in ccache */
290 mech_set.elements = &gse_ctx->gss_mech;
292 gss_maj = gss_acquire_cred(&gss_min,
300 DEBUG(0, ("gss_acquire_creds failed for %s, with [%s]\n",
301 (char *)name_buffer.value,
302 gse_errstr(gse_ctx, gss_maj, gss_min)));
303 status = NT_STATUS_INTERNAL_ERROR;
308 TALLOC_FREE(name_buffer.value);
312 TALLOC_FREE(name_buffer.value);
313 TALLOC_FREE(gse_ctx);
317 static NTSTATUS gse_get_client_auth_token(TALLOC_CTX *mem_ctx,
318 struct gse_context *gse_ctx,
319 const DATA_BLOB *token_in,
320 DATA_BLOB *token_out)
322 OM_uint32 gss_maj, gss_min;
323 gss_buffer_desc in_data;
324 gss_buffer_desc out_data;
325 DATA_BLOB blob = data_blob_null;
328 in_data.value = token_in->data;
329 in_data.length = token_in->length;
331 gss_maj = gss_init_sec_context(&gss_min,
334 gse_ctx->server_name,
336 gse_ctx->gss_c_flags,
337 0, GSS_C_NO_CHANNEL_BINDINGS,
338 &in_data, NULL, &out_data,
339 &gse_ctx->ret_flags, NULL);
342 /* we are done with it */
343 gse_ctx->more_processing = false;
344 status = NT_STATUS_OK;
346 case GSS_S_CONTINUE_NEEDED:
347 /* we will need a third leg */
348 gse_ctx->more_processing = true;
349 /* status = NT_STATUS_MORE_PROCESSING_REQUIRED; */
350 status = NT_STATUS_OK;
353 DEBUG(0, ("gss_init_sec_context failed with [%s]\n",
354 gse_errstr(talloc_tos(), gss_maj, gss_min)));
355 status = NT_STATUS_INTERNAL_ERROR;
359 blob = data_blob_talloc(mem_ctx, out_data.value, out_data.length);
361 status = NT_STATUS_NO_MEMORY;
364 gss_maj = gss_release_buffer(&gss_min, &out_data);
371 static NTSTATUS gse_init_server(TALLOC_CTX *mem_ctx,
372 bool do_sign, bool do_seal,
373 uint32_t add_gss_c_flags,
374 struct gse_context **_gse_ctx)
376 struct gse_context *gse_ctx;
377 OM_uint32 gss_maj, gss_min;
381 status = gse_context_init(mem_ctx, do_sign, do_seal,
382 NULL, add_gss_c_flags, &gse_ctx);
383 if (!NT_STATUS_IS_OK(status)) {
384 return NT_STATUS_NO_MEMORY;
387 ret = gse_krb5_get_server_keytab(gse_ctx->k5ctx,
390 status = NT_STATUS_INTERNAL_ERROR;
394 #ifdef HAVE_GSS_KRB5_IMPORT_CRED
396 /* This creates a GSSAPI cred_id_t with the keytab set */
397 gss_maj = gss_krb5_import_cred(&gss_min, NULL, NULL, gse_ctx->keytab,
401 && gss_maj != (GSS_S_CALL_BAD_STRUCTURE|GSS_S_BAD_NAME)) {
402 DEBUG(0, ("gss_krb5_import_cred failed with [%s]\n",
403 gse_errstr(gse_ctx, gss_maj, gss_min)));
404 status = NT_STATUS_INTERNAL_ERROR;
407 /* This is the error the MIT krb5 1.9 gives when it
408 * implements the function, but we do not specify the
409 * principal. However, when we specify the principal
410 * as host$@REALM the GSS acceptor fails with 'wrong
411 * principal in request'. Work around the issue by
412 * falling back to the alternate approach below. */
413 } else if (gss_maj == (GSS_S_CALL_BAD_STRUCTURE|GSS_S_BAD_NAME))
416 * This call sets the default keytab for the whole server, not
417 * just for this context. Need to find a way that does not alter
418 * the state of the whole server ... */
421 gss_OID_set_desc mech_set;
423 ret = smb_krb5_keytab_name(gse_ctx, gse_ctx->k5ctx,
424 gse_ctx->keytab, &ktname);
426 status = NT_STATUS_INTERNAL_ERROR;
430 ret = gsskrb5_register_acceptor_identity(ktname);
432 status = NT_STATUS_INTERNAL_ERROR;
437 mech_set.elements = &gse_ctx->gss_mech;
439 gss_maj = gss_acquire_cred(&gss_min,
448 DEBUG(0, ("gss_acquire_creds failed with [%s]\n",
449 gse_errstr(gse_ctx, gss_maj, gss_min)));
450 status = NT_STATUS_INTERNAL_ERROR;
455 status = NT_STATUS_OK;
458 if (!NT_STATUS_IS_OK(status)) {
459 TALLOC_FREE(gse_ctx);
466 static NTSTATUS gse_get_server_auth_token(TALLOC_CTX *mem_ctx,
467 struct gse_context *gse_ctx,
468 const DATA_BLOB *token_in,
469 DATA_BLOB *token_out)
471 OM_uint32 gss_maj, gss_min;
472 gss_buffer_desc in_data;
473 gss_buffer_desc out_data;
474 DATA_BLOB blob = data_blob_null;
477 in_data.value = token_in->data;
478 in_data.length = token_in->length;
480 gss_maj = gss_accept_sec_context(&gss_min,
484 GSS_C_NO_CHANNEL_BINDINGS,
485 &gse_ctx->client_name,
488 &gse_ctx->ret_flags, NULL,
489 &gse_ctx->delegated_creds);
492 /* we are done with it */
493 gse_ctx->more_processing = false;
494 gse_ctx->authenticated = true;
495 status = NT_STATUS_OK;
497 case GSS_S_CONTINUE_NEEDED:
498 /* we will need a third leg */
499 gse_ctx->more_processing = true;
500 /* status = NT_STATUS_MORE_PROCESSING_REQUIRED; */
501 status = NT_STATUS_OK;
504 DEBUG(0, ("gss_init_sec_context failed with [%s]\n",
505 gse_errstr(talloc_tos(), gss_maj, gss_min)));
507 if (gse_ctx->gss_ctx) {
508 gss_delete_sec_context(&gss_min,
513 status = NT_STATUS_INTERNAL_ERROR;
517 /* we may be told to return nothing */
518 if (out_data.length) {
519 blob = data_blob_talloc(mem_ctx, out_data.value, out_data.length);
521 status = NT_STATUS_NO_MEMORY;
523 gss_maj = gss_release_buffer(&gss_min, &out_data);
532 static NTSTATUS gse_verify_server_auth_flags(struct gse_context *gse_ctx)
534 if (!gse_ctx->authenticated) {
535 return NT_STATUS_INVALID_HANDLE;
538 if (memcmp(gse_ctx->ret_mech,
539 gss_mech_krb5, sizeof(gss_OID_desc)) != 0) {
540 return NT_STATUS_ACCESS_DENIED;
543 /* GSS_C_MUTUAL_FLAG */
544 if (gse_ctx->gss_c_flags & GSS_C_MUTUAL_FLAG) {
545 if (!(gse_ctx->ret_flags & GSS_C_MUTUAL_FLAG)) {
546 return NT_STATUS_ACCESS_DENIED;
550 /* GSS_C_DELEG_FLAG */
551 /* GSS_C_DELEG_POLICY_FLAG */
552 /* GSS_C_REPLAY_FLAG */
553 /* GSS_C_SEQUENCE_FLAG */
555 /* GSS_C_INTEG_FLAG */
556 if (gse_ctx->gss_c_flags & GSS_C_INTEG_FLAG) {
557 if (!(gse_ctx->ret_flags & GSS_C_INTEG_FLAG)) {
558 return NT_STATUS_ACCESS_DENIED;
562 /* GSS_C_CONF_FLAG */
563 if (gse_ctx->gss_c_flags & GSS_C_CONF_FLAG) {
564 if (!(gse_ctx->ret_flags & GSS_C_CONF_FLAG)) {
565 return NT_STATUS_ACCESS_DENIED;
572 static char *gse_errstr(TALLOC_CTX *mem_ctx, OM_uint32 maj, OM_uint32 min)
574 OM_uint32 gss_min, gss_maj;
575 gss_buffer_desc msg_min;
576 gss_buffer_desc msg_maj;
577 OM_uint32 msg_ctx = 0;
581 ZERO_STRUCT(msg_min);
582 ZERO_STRUCT(msg_maj);
584 gss_maj = gss_display_status(&gss_min, maj, GSS_C_GSS_CODE,
585 GSS_C_NO_OID, &msg_ctx, &msg_maj);
589 errstr = talloc_strndup(mem_ctx,
590 (char *)msg_maj.value,
595 gss_maj = gss_display_status(&gss_min, min, GSS_C_MECH_CODE,
596 (gss_OID)discard_const(gss_mech_krb5),
602 errstr = talloc_strdup_append_buffer(errstr, ": ");
606 errstr = talloc_strndup_append_buffer(errstr,
607 (char *)msg_min.value,
615 gss_maj = gss_release_buffer(&gss_min, &msg_min);
618 gss_maj = gss_release_buffer(&gss_min, &msg_maj);
623 static DATA_BLOB gse_get_session_key(TALLOC_CTX *mem_ctx,
624 struct gse_context *gse_ctx)
626 OM_uint32 gss_min, gss_maj;
627 gss_buffer_set_t set = GSS_C_NO_BUFFER_SET;
630 gss_maj = gss_inquire_sec_context_by_oid(
631 &gss_min, gse_ctx->gss_ctx,
632 &gse_sesskey_inq_oid, &set);
634 DEBUG(0, ("gss_inquire_sec_context_by_oid failed [%s]\n",
635 gse_errstr(talloc_tos(), gss_maj, gss_min)));
636 return data_blob_null;
639 if ((set == GSS_C_NO_BUFFER_SET) ||
641 (memcmp(set->elements[1].value,
642 gse_sesskeytype_oid.elements,
643 gse_sesskeytype_oid.length) != 0)) {
644 #ifdef HAVE_GSSKRB5_GET_SUBKEY
645 krb5_keyblock *subkey;
646 gss_maj = gsskrb5_get_subkey(&gss_min,
650 DEBUG(1, ("NO session key for this mech\n"));
651 return data_blob_null;
653 ret = data_blob_talloc(mem_ctx,
654 KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
655 krb5_free_keyblock(NULL /* should be krb5_context */, subkey);
658 DEBUG(0, ("gss_inquire_sec_context_by_oid returned unknown "
659 "OID for data in results:\n"));
660 dump_data(1, (uint8_t *)set->elements[1].value,
661 set->elements[1].length);
662 return data_blob_null;
666 ret = data_blob_talloc(mem_ctx, set->elements[0].value,
667 set->elements[0].length);
669 gss_maj = gss_release_buffer_set(&gss_min, &set);
673 static size_t gse_get_signature_length(struct gse_context *gse_ctx,
674 int seal, size_t payload_size)
676 OM_uint32 gss_min, gss_maj;
677 gss_iov_buffer_desc iov[2];
678 uint8_t fakebuf[payload_size];
681 iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
682 iov[0].buffer.value = NULL;
683 iov[0].buffer.length = 0;
684 iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
685 iov[1].buffer.value = fakebuf;
686 iov[1].buffer.length = payload_size;
688 gss_maj = gss_wrap_iov_length(&gss_min, gse_ctx->gss_ctx,
689 seal, GSS_C_QOP_DEFAULT,
692 DEBUG(0, ("gss_wrap_iov_length failed with [%s]\n",
693 gse_errstr(talloc_tos(), gss_maj, gss_min)));
697 return iov[0].buffer.length;
700 static NTSTATUS gse_seal(TALLOC_CTX *mem_ctx, struct gse_context *gse_ctx,
701 DATA_BLOB *data, DATA_BLOB *signature)
703 OM_uint32 gss_min, gss_maj;
704 gss_iov_buffer_desc iov[2];
705 int req_seal = 1; /* setting to 1 means we request sign+seal */
709 /* allocate the memory ourselves so we do not need to talloc_memdup */
710 signature->length = gse_get_signature_length(gse_ctx, 1, data->length);
711 if (!signature->length) {
712 return NT_STATUS_INTERNAL_ERROR;
714 signature->data = (uint8_t *)talloc_size(mem_ctx, signature->length);
715 if (!signature->data) {
716 return NT_STATUS_NO_MEMORY;
718 iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
719 iov[0].buffer.value = signature->data;
720 iov[0].buffer.length = signature->length;
722 /* data is encrypted in place, which is ok */
723 iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
724 iov[1].buffer.value = data->data;
725 iov[1].buffer.length = data->length;
727 gss_maj = gss_wrap_iov(&gss_min, gse_ctx->gss_ctx,
728 req_seal, GSS_C_QOP_DEFAULT,
731 DEBUG(0, ("gss_wrap_iov failed with [%s]\n",
732 gse_errstr(talloc_tos(), gss_maj, gss_min)));
733 status = NT_STATUS_ACCESS_DENIED;
738 DEBUG(0, ("gss_wrap_iov says data was not sealed!\n"));
739 status = NT_STATUS_ACCESS_DENIED;
743 status = NT_STATUS_OK;
745 DEBUG(10, ("Sealed %d bytes, and got %d bytes header/signature.\n",
746 (int)iov[1].buffer.length, (int)iov[0].buffer.length));
752 static NTSTATUS gse_unseal(TALLOC_CTX *mem_ctx, struct gse_context *gse_ctx,
753 DATA_BLOB *data, const DATA_BLOB *signature)
755 OM_uint32 gss_min, gss_maj;
756 gss_iov_buffer_desc iov[2];
760 iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
761 iov[0].buffer.value = signature->data;
762 iov[0].buffer.length = signature->length;
764 /* data is decrypted in place, which is ok */
765 iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
766 iov[1].buffer.value = data->data;
767 iov[1].buffer.length = data->length;
769 gss_maj = gss_unwrap_iov(&gss_min, gse_ctx->gss_ctx,
770 &sealed, NULL, iov, 2);
772 DEBUG(0, ("gss_unwrap_iov failed with [%s]\n",
773 gse_errstr(talloc_tos(), gss_maj, gss_min)));
774 status = NT_STATUS_ACCESS_DENIED;
779 DEBUG(0, ("gss_unwrap_iov says data is not sealed!\n"));
780 status = NT_STATUS_ACCESS_DENIED;
784 status = NT_STATUS_OK;
786 DEBUG(10, ("Unsealed %d bytes, with %d bytes header/signature.\n",
787 (int)iov[1].buffer.length, (int)iov[0].buffer.length));
793 static NTSTATUS gse_sign(TALLOC_CTX *mem_ctx, struct gse_context *gse_ctx,
794 DATA_BLOB *data, DATA_BLOB *signature)
796 OM_uint32 gss_min, gss_maj;
797 gss_buffer_desc in_data = { 0, NULL };
798 gss_buffer_desc out_data = { 0, NULL};
801 in_data.value = data->data;
802 in_data.length = data->length;
804 gss_maj = gss_get_mic(&gss_min, gse_ctx->gss_ctx,
806 &in_data, &out_data);
808 DEBUG(0, ("gss_get_mic failed with [%s]\n",
809 gse_errstr(talloc_tos(), gss_maj, gss_min)));
810 status = NT_STATUS_ACCESS_DENIED;
814 *signature = data_blob_talloc(mem_ctx,
815 out_data.value, out_data.length);
816 if (!signature->data) {
817 status = NT_STATUS_NO_MEMORY;
821 status = NT_STATUS_OK;
824 if (out_data.value) {
825 gss_maj = gss_release_buffer(&gss_min, &out_data);
830 static NTSTATUS gse_sigcheck(TALLOC_CTX *mem_ctx, struct gse_context *gse_ctx,
831 const DATA_BLOB *data, const DATA_BLOB *signature)
833 OM_uint32 gss_min, gss_maj;
834 gss_buffer_desc in_data = { 0, NULL };
835 gss_buffer_desc in_token = { 0, NULL};
838 in_data.value = data->data;
839 in_data.length = data->length;
840 in_token.value = signature->data;
841 in_token.length = signature->length;
843 gss_maj = gss_verify_mic(&gss_min, gse_ctx->gss_ctx,
844 &in_data, &in_token, NULL);
846 DEBUG(0, ("gss_verify_mic failed with [%s]\n",
847 gse_errstr(talloc_tos(), gss_maj, gss_min)));
848 status = NT_STATUS_ACCESS_DENIED;
852 status = NT_STATUS_OK;
858 static NTSTATUS gensec_gse_client_start(struct gensec_security *gensec_security)
860 struct gse_context *gse_ctx;
861 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
863 OM_uint32 want_flags = 0;
864 bool do_sign = false, do_seal = false;
865 const char *hostname = gensec_get_target_hostname(gensec_security);
866 const char *service = gensec_get_target_service(gensec_security);
867 const char *username = cli_credentials_get_username(creds);
868 const char *password = cli_credentials_get_password(creds);
871 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
872 return NT_STATUS_INVALID_PARAMETER;
874 if (is_ipaddress(hostname)) {
875 DEBUG(2, ("Cannot do GSE to an IP address\n"));
876 return NT_STATUS_INVALID_PARAMETER;
878 if (strcmp(hostname, "localhost") == 0) {
879 DEBUG(2, ("GSE to 'localhost' does not make sense\n"));
880 return NT_STATUS_INVALID_PARAMETER;
883 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
886 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
889 if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
890 want_flags |= GSS_C_DCE_STYLE;
893 nt_status = gse_init_client(gensec_security, do_sign, do_seal, NULL,
895 username, password, want_flags,
897 if (!NT_STATUS_IS_OK(nt_status)) {
900 gensec_security->private_data = gse_ctx;
904 static NTSTATUS gensec_gse_server_start(struct gensec_security *gensec_security)
906 struct gse_context *gse_ctx;
908 OM_uint32 want_flags = 0;
909 bool do_sign = false, do_seal = false;
911 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
914 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
917 if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
918 want_flags |= GSS_C_DCE_STYLE;
921 nt_status = gse_init_server(gensec_security, do_sign, do_seal, want_flags,
923 if (!NT_STATUS_IS_OK(nt_status)) {
926 gensec_security->private_data = gse_ctx;
931 * Check if the packet is one for this mechansim
933 * @param gensec_security GENSEC state
934 * @param in The request, as a DATA_BLOB
935 * @return Error, INVALID_PARAMETER if it's not a packet for us
936 * or NT_STATUS_OK if the packet is ok.
939 static NTSTATUS gensec_gse_magic(struct gensec_security *gensec_security,
942 if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
945 return NT_STATUS_INVALID_PARAMETER;
951 * Next state function for the GSE GENSEC mechanism
953 * @param gensec_gse_state GSE State
954 * @param mem_ctx The TALLOC_CTX for *out to be allocated on
955 * @param in The request, as a DATA_BLOB
956 * @param out The reply, as an talloc()ed DATA_BLOB, on *mem_ctx
957 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
958 * or NT_STATUS_OK if the user is authenticated.
961 static NTSTATUS gensec_gse_update(struct gensec_security *gensec_security,
963 struct tevent_context *ev,
964 const DATA_BLOB in, DATA_BLOB *out)
967 struct gse_context *gse_ctx =
968 talloc_get_type_abort(gensec_security->private_data,
971 switch (gensec_security->gensec_role) {
973 status = gse_get_client_auth_token(mem_ctx, gse_ctx,
977 status = gse_get_server_auth_token(mem_ctx, gse_ctx,
981 if (!NT_STATUS_IS_OK(status)) {
984 if (gse_ctx->more_processing) {
985 return NT_STATUS_MORE_PROCESSING_REQUIRED;
988 if (gensec_security->gensec_role == GENSEC_SERVER) {
989 return gse_verify_server_auth_flags(gse_ctx);
995 static NTSTATUS gensec_gse_wrap(struct gensec_security *gensec_security,
1000 struct gse_context *gse_ctx =
1001 talloc_get_type_abort(gensec_security->private_data,
1002 struct gse_context);
1003 OM_uint32 maj_stat, min_stat;
1004 gss_buffer_desc input_token, output_token;
1006 input_token.length = in->length;
1007 input_token.value = in->data;
1009 maj_stat = gss_wrap(&min_stat,
1011 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1016 if (GSS_ERROR(maj_stat)) {
1017 DEBUG(0, ("gensec_gse_wrap: GSS Wrap failed: %s\n",
1018 gse_errstr(talloc_tos(), maj_stat, min_stat)));
1019 return NT_STATUS_ACCESS_DENIED;
1022 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
1023 gss_release_buffer(&min_stat, &output_token);
1025 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1027 return NT_STATUS_ACCESS_DENIED;
1029 return NT_STATUS_OK;
1032 static NTSTATUS gensec_gse_unwrap(struct gensec_security *gensec_security,
1033 TALLOC_CTX *mem_ctx,
1034 const DATA_BLOB *in,
1037 struct gse_context *gse_ctx =
1038 talloc_get_type_abort(gensec_security->private_data,
1039 struct gse_context);
1040 OM_uint32 maj_stat, min_stat;
1041 gss_buffer_desc input_token, output_token;
1043 gss_qop_t qop_state;
1044 input_token.length = in->length;
1045 input_token.value = in->data;
1047 maj_stat = gss_unwrap(&min_stat,
1053 if (GSS_ERROR(maj_stat)) {
1054 DEBUG(0, ("gensec_gse_unwrap: GSS UnWrap failed: %s\n",
1055 gse_errstr(talloc_tos(), maj_stat, min_stat)));
1056 return NT_STATUS_ACCESS_DENIED;
1059 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
1060 gss_release_buffer(&min_stat, &output_token);
1062 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1064 return NT_STATUS_ACCESS_DENIED;
1066 return NT_STATUS_OK;
1069 static NTSTATUS gensec_gse_seal_packet(struct gensec_security *gensec_security,
1070 TALLOC_CTX *mem_ctx,
1071 uint8_t *data, size_t length,
1072 const uint8_t *whole_pdu, size_t pdu_length,
1075 struct gse_context *gse_ctx =
1076 talloc_get_type_abort(gensec_security->private_data,
1077 struct gse_context);
1078 DATA_BLOB payload = data_blob_const(data, length);
1079 return gse_seal(mem_ctx, gse_ctx, &payload, sig);
1082 static NTSTATUS gensec_gse_unseal_packet(struct gensec_security *gensec_security,
1083 uint8_t *data, size_t length,
1084 const uint8_t *whole_pdu, size_t pdu_length,
1085 const DATA_BLOB *sig)
1087 struct gse_context *gse_ctx =
1088 talloc_get_type_abort(gensec_security->private_data,
1089 struct gse_context);
1090 DATA_BLOB payload = data_blob_const(data, length);
1091 return gse_unseal(talloc_tos() /* unused */, gse_ctx, &payload, sig);
1094 static NTSTATUS gensec_gse_sign_packet(struct gensec_security *gensec_security,
1095 TALLOC_CTX *mem_ctx,
1096 const uint8_t *data, size_t length,
1097 const uint8_t *whole_pdu, size_t pdu_length,
1100 struct gse_context *gse_ctx =
1101 talloc_get_type_abort(gensec_security->private_data,
1102 struct gse_context);
1103 DATA_BLOB payload = data_blob_const(data, length);
1104 return gse_sign(mem_ctx, gse_ctx, &payload, sig);
1107 static NTSTATUS gensec_gse_check_packet(struct gensec_security *gensec_security,
1108 const uint8_t *data, size_t length,
1109 const uint8_t *whole_pdu, size_t pdu_length,
1110 const DATA_BLOB *sig)
1112 struct gse_context *gse_ctx =
1113 talloc_get_type_abort(gensec_security->private_data,
1114 struct gse_context);
1115 DATA_BLOB payload = data_blob_const(data, length);
1116 return gse_sigcheck(NULL, gse_ctx, &payload, sig);
1119 /* Try to figure out what features we actually got on the connection */
1120 static bool gensec_gse_have_feature(struct gensec_security *gensec_security,
1123 struct gse_context *gse_ctx =
1124 talloc_get_type_abort(gensec_security->private_data,
1125 struct gse_context);
1127 if (feature & GENSEC_FEATURE_SIGN) {
1128 return gse_ctx->ret_flags & GSS_C_INTEG_FLAG;
1130 if (feature & GENSEC_FEATURE_SEAL) {
1131 return gse_ctx->ret_flags & GSS_C_CONF_FLAG;
1133 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1134 /* Only for GSE/Krb5 */
1135 if (gss_oid_equal(gse_ctx->ret_mech, gss_mech_krb5)) {
1139 if (feature & GENSEC_FEATURE_DCE_STYLE) {
1140 return gse_ctx->ret_flags & GSS_C_DCE_STYLE;
1142 /* We can always do async (rather than strict request/reply) packets. */
1143 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1150 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1151 * (for encrypting some passwords).
1153 * This breaks all the abstractions, but what do you expect...
1155 static NTSTATUS gensec_gse_session_key(struct gensec_security *gensec_security,
1156 TALLOC_CTX *mem_ctx,
1157 DATA_BLOB *session_key_out)
1159 struct gse_context *gse_ctx =
1160 talloc_get_type_abort(gensec_security->private_data,
1161 struct gse_context);
1163 DATA_BLOB session_key = gse_get_session_key(mem_ctx, gse_ctx);
1164 if (session_key.data == NULL) {
1165 return NT_STATUS_NO_USER_SESSION_KEY;
1168 *session_key_out = session_key;
1170 return NT_STATUS_OK;
1173 /* Get some basic (and authorization) information about the user on
1174 * this session. This uses either the PAC (if present) or a local
1175 * database lookup */
1176 static NTSTATUS gensec_gse_session_info(struct gensec_security *gensec_security,
1177 TALLOC_CTX *mem_ctx,
1178 struct auth_session_info **_session_info)
1180 struct gse_context *gse_ctx =
1181 talloc_get_type_abort(gensec_security->private_data,
1182 struct gse_context);
1184 TALLOC_CTX *tmp_ctx;
1185 struct auth_session_info *session_info = NULL;
1186 OM_uint32 maj_stat, min_stat;
1187 DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1189 gss_buffer_desc name_token;
1190 char *principal_string;
1192 tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gse_session_info context");
1193 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1195 maj_stat = gss_display_name(&min_stat,
1196 gse_ctx->client_name,
1199 if (GSS_ERROR(maj_stat)) {
1200 DEBUG(1, ("GSS display_name failed: %s\n",
1201 gse_errstr(talloc_tos(), maj_stat, min_stat)));
1202 talloc_free(tmp_ctx);
1203 return NT_STATUS_FOOBAR;
1206 principal_string = talloc_strndup(tmp_ctx,
1207 (const char *)name_token.value,
1210 gss_release_buffer(&min_stat, &name_token);
1212 if (!principal_string) {
1213 talloc_free(tmp_ctx);
1214 return NT_STATUS_NO_MEMORY;
1217 nt_status = gssapi_obtain_pac_blob(tmp_ctx, gse_ctx->gss_ctx,
1218 gse_ctx->client_name,
1221 /* IF we have the PAC - otherwise we need to get this
1222 * data from elsewere
1224 if (NT_STATUS_IS_OK(nt_status)) {
1225 pac_blob_ptr = &pac_blob;
1227 nt_status = gensec_generate_session_info_pac(tmp_ctx,
1230 pac_blob_ptr, principal_string,
1231 gensec_get_remote_address(gensec_security),
1233 if (!NT_STATUS_IS_OK(nt_status)) {
1234 talloc_free(tmp_ctx);
1238 nt_status = gensec_gse_session_key(gensec_security, session_info,
1239 &session_info->session_key);
1240 if (!NT_STATUS_IS_OK(nt_status)) {
1241 talloc_free(tmp_ctx);
1245 *_session_info = talloc_move(mem_ctx, &session_info);
1246 talloc_free(tmp_ctx);
1248 return NT_STATUS_OK;
1251 static size_t gensec_gse_sig_size(struct gensec_security *gensec_security,
1254 struct gse_context *gse_ctx =
1255 talloc_get_type_abort(gensec_security->private_data,
1256 struct gse_context);
1258 return gse_get_signature_length(gse_ctx,
1259 gensec_security->want_features & GENSEC_FEATURE_SEAL,
1263 static const char *gensec_gse_krb5_oids[] = {
1264 GENSEC_OID_KERBEROS5_OLD,
1265 GENSEC_OID_KERBEROS5,
1269 const struct gensec_security_ops gensec_gse_krb5_security_ops = {
1271 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1272 .oid = gensec_gse_krb5_oids,
1273 .client_start = gensec_gse_client_start,
1274 .server_start = gensec_gse_server_start,
1275 .magic = gensec_gse_magic,
1276 .update = gensec_gse_update,
1277 .session_key = gensec_gse_session_key,
1278 .session_info = gensec_gse_session_info,
1279 .sig_size = gensec_gse_sig_size,
1280 .sign_packet = gensec_gse_sign_packet,
1281 .check_packet = gensec_gse_check_packet,
1282 .seal_packet = gensec_gse_seal_packet,
1283 .unseal_packet = gensec_gse_unseal_packet,
1284 .wrap = gensec_gse_wrap,
1285 .unwrap = gensec_gse_unwrap,
1286 .have_feature = gensec_gse_have_feature,
1289 .priority = GENSEC_GSSAPI
1292 #endif /* HAVE_KRB5 && HAVE_GSS_WRAP_IOV */