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"
30 #include "lib/ldb/include/ldb.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 "param/param.h"
38 #include "auth/session_proto.h"
39 #include <gssapi/gssapi.h>
40 #include <gssapi/gssapi_krb5.h>
42 enum gensec_gssapi_sasl_state
46 STAGE_SASL_SSF_ACCEPT,
54 struct gensec_gssapi_state {
55 gss_ctx_id_t gssapi_context;
56 struct gss_channel_bindings_struct *input_chan_bindings;
57 gss_name_t server_name;
58 gss_name_t client_name;
59 OM_uint32 want_flags, got_flags;
62 DATA_BLOB session_key;
65 struct smb_krb5_context *smb_krb5_context;
66 struct gssapi_creds_container *client_cred;
67 struct gssapi_creds_container *server_cred;
68 gss_krb5_lucid_context_v1_t *lucid;
70 gss_cred_id_t delegated_cred_handle;
72 bool sasl; /* We have two different mechs in this file: One
73 * for SASL wrapped GSSAPI and another for normal
75 enum gensec_gssapi_sasl_state sasl_state;
76 uint8_t sasl_protection; /* What was negotiated at the SASL
77 * layer, independent of the GSSAPI
80 size_t max_wrap_buf_size;
81 int gss_exchange_count;
85 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
86 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
88 static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
89 OM_uint32 maj_stat, OM_uint32 min_stat,
92 OM_uint32 disp_min_stat, disp_maj_stat;
93 gss_buffer_desc maj_error_message;
94 gss_buffer_desc min_error_message;
95 char *maj_error_string, *min_error_string;
96 OM_uint32 msg_ctx = 0;
100 maj_error_message.value = NULL;
101 min_error_message.value = NULL;
102 maj_error_message.length = 0;
103 min_error_message.length = 0;
105 disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
106 mech, &msg_ctx, &maj_error_message);
107 disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
108 mech, &msg_ctx, &min_error_message);
110 maj_error_string = talloc_strndup(mem_ctx, (char *)maj_error_message.value, maj_error_message.length);
112 min_error_string = talloc_strndup(mem_ctx, (char *)min_error_message.value, min_error_message.length);
114 ret = talloc_asprintf(mem_ctx, "%s: %s", maj_error_string, min_error_string);
116 talloc_free(maj_error_string);
117 talloc_free(min_error_string);
119 gss_release_buffer(&disp_min_stat, &maj_error_message);
120 gss_release_buffer(&disp_min_stat, &min_error_message);
126 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
128 OM_uint32 maj_stat, min_stat;
130 if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
131 maj_stat = gss_release_cred(&min_stat,
132 &gensec_gssapi_state->delegated_cred_handle);
135 if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
136 maj_stat = gss_delete_sec_context (&min_stat,
137 &gensec_gssapi_state->gssapi_context,
141 if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
142 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
144 if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
145 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
148 if (gensec_gssapi_state->lucid) {
149 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
155 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
157 OM_uint32 maj_stat, min_stat;
159 if (gensec_gssapi_state->lucid) {
163 maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
164 &gensec_gssapi_state->gssapi_context,
166 (void **)&gensec_gssapi_state->lucid);
167 if (maj_stat != GSS_S_COMPLETE) {
168 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
169 gssapi_error_string(gensec_gssapi_state,
171 gensec_gssapi_state->gss_oid)));
172 return NT_STATUS_INTERNAL_ERROR;
175 if (gensec_gssapi_state->lucid->version != 1) {
176 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
177 gensec_gssapi_state->lucid->version));
178 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
179 gensec_gssapi_state->lucid = NULL;
180 return NT_STATUS_INTERNAL_ERROR;
186 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
188 struct gensec_gssapi_state *gensec_gssapi_state;
190 struct gsskrb5_send_to_kdc send_to_kdc;
192 gensec_gssapi_state = talloc(gensec_security, struct gensec_gssapi_state);
193 if (!gensec_gssapi_state) {
194 return NT_STATUS_NO_MEMORY;
197 gensec_gssapi_state->gss_exchange_count = 0;
198 gensec_gssapi_state->max_wrap_buf_size
199 = lp_parm_int(gensec_security->lp_ctx, NULL, "gensec_gssapi", "max wrap buf size", 65536);
201 gensec_gssapi_state->sasl = false;
202 gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
204 gensec_security->private_data = gensec_gssapi_state;
206 gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
207 gensec_gssapi_state->server_name = GSS_C_NO_NAME;
208 gensec_gssapi_state->client_name = GSS_C_NO_NAME;
209 gensec_gssapi_state->lucid = NULL;
211 /* TODO: Fill in channel bindings */
212 gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
214 gensec_gssapi_state->want_flags = 0;
215 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "mutual", true)) {
216 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
218 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "delegation", true)) {
219 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
221 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "replay", true)) {
222 gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
224 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "sequence", true)) {
225 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
228 gensec_gssapi_state->got_flags = 0;
230 gensec_gssapi_state->session_key = data_blob(NULL, 0);
231 gensec_gssapi_state->pac = data_blob(NULL, 0);
233 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
234 gensec_gssapi_state->sig_size = 0;
236 talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
238 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
239 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
241 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
242 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
244 if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
245 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
248 gensec_gssapi_state->gss_oid = GSS_C_NULL_OID;
250 send_to_kdc.func = smb_krb5_send_and_recv_func;
251 send_to_kdc.ptr = gensec_security->event_ctx;
253 ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
255 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
256 talloc_free(gensec_gssapi_state);
257 return NT_STATUS_INTERNAL_ERROR;
259 if (lp_realm(gensec_security->lp_ctx) && *lp_realm(gensec_security->lp_ctx)) {
260 char *upper_realm = strupper_talloc(gensec_gssapi_state, lp_realm(gensec_security->lp_ctx));
262 DEBUG(1,("gensec_krb5_start: could not uppercase realm: %s\n", lp_realm(gensec_security->lp_ctx)));
263 talloc_free(gensec_gssapi_state);
264 return NT_STATUS_NO_MEMORY;
266 ret = gsskrb5_set_default_realm(upper_realm);
267 talloc_free(upper_realm);
269 DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
270 talloc_free(gensec_gssapi_state);
271 return NT_STATUS_INTERNAL_ERROR;
275 /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
276 ret = gsskrb5_set_dns_canonicalize(lp_parm_bool(gensec_security->lp_ctx, NULL, "krb5", "set_dns_canonicalize", false));
278 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
279 talloc_free(gensec_gssapi_state);
280 return NT_STATUS_INTERNAL_ERROR;
283 ret = smb_krb5_init_context(gensec_gssapi_state,
284 gensec_security->event_ctx,
285 gensec_security->lp_ctx,
286 &gensec_gssapi_state->smb_krb5_context);
288 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
289 error_message(ret)));
290 talloc_free(gensec_gssapi_state);
291 return NT_STATUS_INTERNAL_ERROR;
296 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
300 struct gensec_gssapi_state *gensec_gssapi_state;
301 struct cli_credentials *machine_account;
302 struct gssapi_creds_container *gcc;
304 nt_status = gensec_gssapi_start(gensec_security);
305 if (!NT_STATUS_IS_OK(nt_status)) {
309 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
311 machine_account = gensec_get_credentials(gensec_security);
313 if (!machine_account) {
314 DEBUG(3, ("No machine account credentials specified\n"));
315 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
317 ret = cli_credentials_get_server_gss_creds(machine_account,
318 gensec_security->event_ctx,
319 gensec_security->lp_ctx, &gcc);
321 DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
322 error_message(ret)));
323 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
327 gensec_gssapi_state->server_cred = gcc;
332 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
335 struct gensec_gssapi_state *gensec_gssapi_state;
336 nt_status = gensec_gssapi_server_start(gensec_security);
338 if (NT_STATUS_IS_OK(nt_status)) {
339 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
340 gensec_gssapi_state->sasl = true;
345 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
347 struct gensec_gssapi_state *gensec_gssapi_state;
348 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
351 gss_buffer_desc name_token;
353 OM_uint32 maj_stat, min_stat;
354 const char *hostname = gensec_get_target_hostname(gensec_security);
355 const char *principal;
356 struct gssapi_creds_container *gcc;
359 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
360 return NT_STATUS_INVALID_PARAMETER;
362 if (is_ipaddress(hostname)) {
363 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
364 return NT_STATUS_INVALID_PARAMETER;
366 if (strcmp(hostname, "localhost") == 0) {
367 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
368 return NT_STATUS_INVALID_PARAMETER;
371 nt_status = gensec_gssapi_start(gensec_security);
372 if (!NT_STATUS_IS_OK(nt_status)) {
376 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
378 gensec_gssapi_state->gss_oid = gss_mech_krb5;
380 principal = gensec_get_target_principal(gensec_security);
381 if (principal && lp_client_use_spnego_principal(gensec_security->lp_ctx)) {
382 name_type = GSS_C_NULL_OID;
384 principal = talloc_asprintf(gensec_gssapi_state, "%s@%s",
385 gensec_get_target_service(gensec_security),
388 name_type = GSS_C_NT_HOSTBASED_SERVICE;
390 name_token.value = discard_const_p(uint8_t, principal);
391 name_token.length = strlen(principal);
394 maj_stat = gss_import_name (&min_stat,
397 &gensec_gssapi_state->server_name);
399 DEBUG(2, ("GSS Import name of %s failed: %s\n",
400 (char *)name_token.value,
401 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
402 return NT_STATUS_INVALID_PARAMETER;
405 ret = cli_credentials_get_client_gss_creds(creds,
406 gensec_security->event_ctx,
407 gensec_security->lp_ctx, &gcc);
411 case KRB5KDC_ERR_PREAUTH_FAILED:
412 return NT_STATUS_LOGON_FAILURE;
413 case KRB5_KDC_UNREACH:
414 DEBUG(3, ("Cannot reach a KDC we require to contact %s\n", principal));
415 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
417 DEBUG(1, ("Aquiring initiator credentials failed\n"));
418 return NT_STATUS_UNSUCCESSFUL;
421 gensec_gssapi_state->client_cred = gcc;
422 if (!talloc_reference(gensec_gssapi_state, gcc)) {
423 return NT_STATUS_NO_MEMORY;
429 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
432 struct gensec_gssapi_state *gensec_gssapi_state;
433 nt_status = gensec_gssapi_client_start(gensec_security);
435 if (NT_STATUS_IS_OK(nt_status)) {
436 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
437 gensec_gssapi_state->sasl = true;
444 * Check if the packet is one for this mechansim
446 * @param gensec_security GENSEC state
447 * @param in The request, as a DATA_BLOB
448 * @return Error, INVALID_PARAMETER if it's not a packet for us
449 * or NT_STATUS_OK if the packet is ok.
452 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
455 if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
458 return NT_STATUS_INVALID_PARAMETER;
464 * Next state function for the GSSAPI GENSEC mechanism
466 * @param gensec_gssapi_state GSSAPI State
467 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
468 * @param in The request, as a DATA_BLOB
469 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
470 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
471 * or NT_STATUS_OK if the user is authenticated.
474 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
475 TALLOC_CTX *out_mem_ctx,
476 const DATA_BLOB in, DATA_BLOB *out)
478 struct gensec_gssapi_state *gensec_gssapi_state
479 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
480 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
481 OM_uint32 maj_stat, min_stat;
483 gss_buffer_desc input_token, output_token;
484 gss_OID gss_oid_p = NULL;
485 input_token.length = in.length;
486 input_token.value = in.data;
488 switch (gensec_gssapi_state->sasl_state) {
491 switch (gensec_security->gensec_role) {
494 maj_stat = gss_init_sec_context(&min_stat,
495 gensec_gssapi_state->client_cred->creds,
496 &gensec_gssapi_state->gssapi_context,
497 gensec_gssapi_state->server_name,
498 gensec_gssapi_state->gss_oid,
499 gensec_gssapi_state->want_flags,
501 gensec_gssapi_state->input_chan_bindings,
505 &gensec_gssapi_state->got_flags, /* ret flags */
508 gensec_gssapi_state->gss_oid = gss_oid_p;
514 maj_stat = gss_accept_sec_context(&min_stat,
515 &gensec_gssapi_state->gssapi_context,
516 gensec_gssapi_state->server_cred->creds,
518 gensec_gssapi_state->input_chan_bindings,
519 &gensec_gssapi_state->client_name,
522 &gensec_gssapi_state->got_flags,
524 &gensec_gssapi_state->delegated_cred_handle);
526 gensec_gssapi_state->gss_oid = gss_oid_p;
531 return NT_STATUS_INVALID_PARAMETER;
535 gensec_gssapi_state->gss_exchange_count++;
537 if (maj_stat == GSS_S_COMPLETE) {
538 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
539 gss_release_buffer(&min_stat2, &output_token);
541 if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
542 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
544 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
547 /* We may have been invoked as SASL, so there
548 * is more work to do */
549 if (gensec_gssapi_state->sasl) {
550 /* Due to a very subtle interaction
551 * with SASL and the LDAP libs, we
552 * must ensure the data pointer is
553 * != NULL, but the length is 0.
555 * This ensures we send a 'zero
556 * length' (rather than NULL) response
560 out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
563 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
564 return NT_STATUS_MORE_PROCESSING_REQUIRED;
566 gensec_gssapi_state->sasl_state = STAGE_DONE;
568 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
569 DEBUG(5, ("GSSAPI Connection will be cryptographicly sealed\n"));
570 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
571 DEBUG(5, ("GSSAPI Connection will be cryptographicly signed\n"));
573 DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
578 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
579 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
580 gss_release_buffer(&min_stat2, &output_token);
582 return NT_STATUS_MORE_PROCESSING_REQUIRED;
583 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
585 case KRB5_KDC_UNREACH:
586 DEBUG(3, ("Cannot reach a KDC we require: %s\n",
587 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
588 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
589 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
590 DEBUG(3, ("Server is not registered with our KDC: %s\n",
591 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
592 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
593 case KRB5KRB_AP_ERR_MSG_TYPE:
594 /* garbage input, possibly from the auto-mech detection */
595 return NT_STATUS_INVALID_PARAMETER;
597 DEBUG(1, ("GSS Update(krb5)(%d) Update failed: %s\n",
598 gensec_gssapi_state->gss_exchange_count,
599 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
603 DEBUG(1, ("GSS Update(%d) failed: %s\n",
604 gensec_gssapi_state->gss_exchange_count,
605 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
611 /* These last two stages are only done if we were invoked as SASL */
612 case STAGE_SASL_SSF_NEG:
614 switch (gensec_security->gensec_role) {
617 uint8_t maxlength_proposed[4];
618 uint8_t maxlength_accepted[4];
619 uint8_t security_supported;
622 input_token.length = in.length;
623 input_token.value = in.data;
625 /* As a client, we have just send a
626 * zero-length blob to the server (after the
627 * normal GSSAPI exchange), and it has replied
628 * with it's SASL negotiation */
630 maj_stat = gss_unwrap(&min_stat,
631 gensec_gssapi_state->gssapi_context,
636 if (GSS_ERROR(maj_stat)) {
637 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
638 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
639 return NT_STATUS_ACCESS_DENIED;
642 if (output_token.length < 4) {
643 return NT_STATUS_INVALID_PARAMETER;
646 memcpy(maxlength_proposed, output_token.value, 4);
647 gss_release_buffer(&min_stat, &output_token);
649 /* first byte is the proposed security */
650 security_supported = maxlength_proposed[0];
651 maxlength_proposed[0] = '\0';
653 /* Rest is the proposed max wrap length */
654 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
655 gensec_gssapi_state->max_wrap_buf_size);
656 gensec_gssapi_state->sasl_protection = 0;
657 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
658 if (security_supported & NEG_SEAL) {
659 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
661 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
662 if (security_supported & NEG_SIGN) {
663 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
665 } else if (security_supported & NEG_NONE) {
666 gensec_gssapi_state->sasl_protection |= NEG_NONE;
668 DEBUG(1, ("Remote server does not support unprotected connections"));
669 return NT_STATUS_ACCESS_DENIED;
672 /* Send back the negotiated max length */
674 RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
676 maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
678 input_token.value = maxlength_accepted;
679 input_token.length = sizeof(maxlength_accepted);
681 maj_stat = gss_wrap(&min_stat,
682 gensec_gssapi_state->gssapi_context,
688 if (GSS_ERROR(maj_stat)) {
689 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
690 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
691 return NT_STATUS_ACCESS_DENIED;
694 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
695 gss_release_buffer(&min_stat, &output_token);
697 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
698 gensec_gssapi_state->sasl_state = STAGE_DONE;
700 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
701 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
702 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
703 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
705 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
712 uint8_t maxlength_proposed[4];
713 uint8_t security_supported = 0x0;
716 /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
717 if (in.length != 0) {
718 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
721 /* Give the client some idea what we will support */
723 RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
724 /* first byte is the proposed security */
725 maxlength_proposed[0] = '\0';
727 gensec_gssapi_state->sasl_protection = 0;
728 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
729 security_supported |= NEG_SEAL;
731 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
732 security_supported |= NEG_SIGN;
734 if (security_supported == 0) {
735 /* If we don't support anything, this must be 0 */
736 RSIVAL(maxlength_proposed, 0, 0x0);
739 /* TODO: We may not wish to support this */
740 security_supported |= NEG_NONE;
741 maxlength_proposed[0] = security_supported;
743 input_token.value = maxlength_proposed;
744 input_token.length = sizeof(maxlength_proposed);
746 maj_stat = gss_wrap(&min_stat,
747 gensec_gssapi_state->gssapi_context,
753 if (GSS_ERROR(maj_stat)) {
754 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
755 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
756 return NT_STATUS_ACCESS_DENIED;
759 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
760 gss_release_buffer(&min_stat, &output_token);
762 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
763 return NT_STATUS_MORE_PROCESSING_REQUIRED;
766 return NT_STATUS_INVALID_PARAMETER;
770 /* This is s server-only stage */
771 case STAGE_SASL_SSF_ACCEPT:
773 uint8_t maxlength_accepted[4];
774 uint8_t security_accepted;
777 input_token.length = in.length;
778 input_token.value = in.data;
780 maj_stat = gss_unwrap(&min_stat,
781 gensec_gssapi_state->gssapi_context,
786 if (GSS_ERROR(maj_stat)) {
787 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
788 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
789 return NT_STATUS_ACCESS_DENIED;
792 if (output_token.length < 4) {
793 return NT_STATUS_INVALID_PARAMETER;
796 memcpy(maxlength_accepted, output_token.value, 4);
797 gss_release_buffer(&min_stat, &output_token);
799 /* first byte is the proposed security */
800 security_accepted = maxlength_accepted[0];
801 maxlength_accepted[0] = '\0';
803 /* Rest is the proposed max wrap length */
804 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
805 gensec_gssapi_state->max_wrap_buf_size);
807 gensec_gssapi_state->sasl_protection = 0;
808 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
809 if (security_accepted & NEG_SEAL) {
810 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
812 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
813 if (security_accepted & NEG_SIGN) {
814 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
816 } else if (security_accepted & NEG_NONE) {
817 gensec_gssapi_state->sasl_protection |= NEG_NONE;
819 DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
820 return NT_STATUS_ACCESS_DENIED;
823 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
824 gensec_gssapi_state->sasl_state = STAGE_DONE;
825 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
826 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
827 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
828 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
830 DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
833 *out = data_blob(NULL, 0);
837 return NT_STATUS_INVALID_PARAMETER;
841 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
846 struct gensec_gssapi_state *gensec_gssapi_state
847 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
848 OM_uint32 maj_stat, min_stat;
849 gss_buffer_desc input_token, output_token;
851 input_token.length = in->length;
852 input_token.value = in->data;
854 maj_stat = gss_wrap(&min_stat,
855 gensec_gssapi_state->gssapi_context,
856 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
861 if (GSS_ERROR(maj_stat)) {
862 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
863 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
864 return NT_STATUS_ACCESS_DENIED;
867 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
868 gss_release_buffer(&min_stat, &output_token);
870 if (gensec_gssapi_state->sasl) {
871 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
872 if (max_wrapped_size < out->length) {
873 DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
874 (unsigned)in->length,
875 (unsigned)out->length,
876 (unsigned int)max_wrapped_size));
877 return NT_STATUS_INVALID_PARAMETER;
881 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
883 return NT_STATUS_ACCESS_DENIED;
888 static NTSTATUS gensec_gssapi_unwrap(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;
899 input_token.length = in->length;
900 input_token.value = in->data;
902 if (gensec_gssapi_state->sasl) {
903 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
904 if (max_wrapped_size < in->length) {
905 DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
906 return NT_STATUS_INVALID_PARAMETER;
910 maj_stat = gss_unwrap(&min_stat,
911 gensec_gssapi_state->gssapi_context,
916 if (GSS_ERROR(maj_stat)) {
917 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
918 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
919 return NT_STATUS_ACCESS_DENIED;
922 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
923 gss_release_buffer(&min_stat, &output_token);
925 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
927 return NT_STATUS_ACCESS_DENIED;
932 /* Find out the maximum input size negotiated on this connection */
934 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
936 struct gensec_gssapi_state *gensec_gssapi_state
937 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
938 OM_uint32 maj_stat, min_stat;
939 OM_uint32 max_input_size;
941 maj_stat = gss_wrap_size_limit(&min_stat,
942 gensec_gssapi_state->gssapi_context,
943 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
945 gensec_gssapi_state->max_wrap_buf_size,
947 if (GSS_ERROR(maj_stat)) {
948 TALLOC_CTX *mem_ctx = talloc_new(NULL);
949 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
950 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
951 talloc_free(mem_ctx);
955 return max_input_size;
958 /* Find out the maximum output size negotiated on this connection */
959 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
961 struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
962 return gensec_gssapi_state->max_wrap_buf_size;
965 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
967 uint8_t *data, size_t length,
968 const uint8_t *whole_pdu, size_t pdu_length,
971 struct gensec_gssapi_state *gensec_gssapi_state
972 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
973 OM_uint32 maj_stat, min_stat;
974 gss_buffer_desc input_token, output_token;
978 input_token.length = length;
979 input_token.value = data;
981 maj_stat = gss_wrap(&min_stat,
982 gensec_gssapi_state->gssapi_context,
983 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
988 if (GSS_ERROR(maj_stat)) {
989 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
990 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
991 return NT_STATUS_ACCESS_DENIED;
994 if (output_token.length < input_token.length) {
995 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
996 (long)output_token.length, (long)length));
997 return NT_STATUS_INTERNAL_ERROR;
999 sig_length = output_token.length - input_token.length;
1001 memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1002 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1004 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1005 dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1006 dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1008 gss_release_buffer(&min_stat, &output_token);
1010 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1012 return NT_STATUS_ACCESS_DENIED;
1014 return NT_STATUS_OK;
1017 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1018 TALLOC_CTX *mem_ctx,
1019 uint8_t *data, size_t length,
1020 const uint8_t *whole_pdu, size_t pdu_length,
1021 const DATA_BLOB *sig)
1023 struct gensec_gssapi_state *gensec_gssapi_state
1024 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1025 OM_uint32 maj_stat, min_stat;
1026 gss_buffer_desc input_token, output_token;
1028 gss_qop_t qop_state;
1031 dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1033 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1035 memcpy(in.data, sig->data, sig->length);
1036 memcpy(in.data + sig->length, data, length);
1038 input_token.length = in.length;
1039 input_token.value = in.data;
1041 maj_stat = gss_unwrap(&min_stat,
1042 gensec_gssapi_state->gssapi_context,
1047 if (GSS_ERROR(maj_stat)) {
1048 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1049 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1050 return NT_STATUS_ACCESS_DENIED;
1053 if (output_token.length != length) {
1054 return NT_STATUS_INTERNAL_ERROR;
1057 memcpy(data, output_token.value, length);
1059 gss_release_buffer(&min_stat, &output_token);
1061 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1063 return NT_STATUS_ACCESS_DENIED;
1065 return NT_STATUS_OK;
1068 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1069 TALLOC_CTX *mem_ctx,
1070 const uint8_t *data, size_t length,
1071 const uint8_t *whole_pdu, size_t pdu_length,
1074 struct gensec_gssapi_state *gensec_gssapi_state
1075 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1076 OM_uint32 maj_stat, min_stat;
1077 gss_buffer_desc input_token, output_token;
1079 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1080 input_token.length = pdu_length;
1081 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1083 input_token.length = length;
1084 input_token.value = discard_const_p(uint8_t *, data);
1087 maj_stat = gss_get_mic(&min_stat,
1088 gensec_gssapi_state->gssapi_context,
1092 if (GSS_ERROR(maj_stat)) {
1093 DEBUG(1, ("GSS GetMic failed: %s\n",
1094 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1095 return NT_STATUS_ACCESS_DENIED;
1098 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1100 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1102 gss_release_buffer(&min_stat, &output_token);
1104 return NT_STATUS_OK;
1107 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1108 TALLOC_CTX *mem_ctx,
1109 const uint8_t *data, size_t length,
1110 const uint8_t *whole_pdu, size_t pdu_length,
1111 const DATA_BLOB *sig)
1113 struct gensec_gssapi_state *gensec_gssapi_state
1114 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1115 OM_uint32 maj_stat, min_stat;
1116 gss_buffer_desc input_token;
1117 gss_buffer_desc input_message;
1118 gss_qop_t qop_state;
1120 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1122 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1123 input_message.length = pdu_length;
1124 input_message.value = discard_const(whole_pdu);
1126 input_message.length = length;
1127 input_message.value = discard_const(data);
1130 input_token.length = sig->length;
1131 input_token.value = sig->data;
1133 maj_stat = gss_verify_mic(&min_stat,
1134 gensec_gssapi_state->gssapi_context,
1138 if (GSS_ERROR(maj_stat)) {
1139 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1140 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1141 return NT_STATUS_ACCESS_DENIED;
1144 return NT_STATUS_OK;
1147 /* Try to figure out what features we actually got on the connection */
1148 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1151 struct gensec_gssapi_state *gensec_gssapi_state
1152 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1153 if (feature & GENSEC_FEATURE_SIGN) {
1154 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1155 if (gensec_gssapi_state->sasl
1156 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1157 return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1158 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1160 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1162 if (feature & GENSEC_FEATURE_SEAL) {
1163 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1164 if (gensec_gssapi_state->sasl
1165 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1166 return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1167 && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1169 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1171 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1172 /* Only for GSSAPI/Krb5 */
1173 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1177 if (feature & GENSEC_FEATURE_DCE_STYLE) {
1178 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1180 if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1183 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1187 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "force_new_spnego", false)) {
1190 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "disable_new_spnego", false)) {
1194 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1195 if (!NT_STATUS_IS_OK(status)) {
1199 if (gensec_gssapi_state->lucid->protocol == 1) {
1205 /* We can always do async (rather than strict request/reply) packets. */
1206 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1213 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1214 * (for encrypting some passwords).
1216 * This breaks all the abstractions, but what do you expect...
1218 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1219 DATA_BLOB *session_key)
1221 struct gensec_gssapi_state *gensec_gssapi_state
1222 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1223 OM_uint32 maj_stat, min_stat;
1224 krb5_keyblock *subkey;
1226 if (gensec_gssapi_state->session_key.data) {
1227 *session_key = gensec_gssapi_state->session_key;
1228 return NT_STATUS_OK;
1231 maj_stat = gsskrb5_get_subkey(&min_stat,
1232 gensec_gssapi_state->gssapi_context,
1234 if (maj_stat != 0) {
1235 DEBUG(1, ("NO session key for this mech\n"));
1236 return NT_STATUS_NO_USER_SESSION_KEY;
1239 DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1240 (int)KRB5_KEY_LENGTH(subkey),
1241 (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1242 *session_key = data_blob_talloc(gensec_gssapi_state,
1243 KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1244 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1245 if (gensec_gssapi_state->sasl_state == STAGE_DONE) {
1246 /* only cache in the done stage */
1247 gensec_gssapi_state->session_key = *session_key;
1249 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1251 return NT_STATUS_OK;
1254 /* Get some basic (and authorization) information about the user on
1255 * this session. This uses either the PAC (if present) or a local
1256 * database lookup */
1257 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1258 struct auth_session_info **_session_info)
1261 TALLOC_CTX *mem_ctx;
1262 struct gensec_gssapi_state *gensec_gssapi_state
1263 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1264 struct auth_serversupplied_info *server_info = NULL;
1265 struct auth_session_info *session_info = NULL;
1266 struct PAC_LOGON_INFO *logon_info;
1267 OM_uint32 maj_stat, min_stat;
1268 gss_buffer_desc name_token;
1269 gss_buffer_desc pac;
1270 krb5_keyblock *keyblock;
1272 krb5_principal principal;
1273 char *principal_string;
1276 if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1277 || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1278 gensec_gssapi_state->gss_oid->length) != 0)) {
1279 DEBUG(1, ("NO session info available for this mech\n"));
1280 return NT_STATUS_INVALID_PARAMETER;
1283 mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1284 NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1286 maj_stat = gss_display_name (&min_stat,
1287 gensec_gssapi_state->client_name,
1290 if (GSS_ERROR(maj_stat)) {
1291 DEBUG(1, ("GSS display_name failed: %s\n",
1292 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1293 talloc_free(mem_ctx);
1294 return NT_STATUS_FOOBAR;
1297 principal_string = talloc_strndup(mem_ctx,
1298 (const char *)name_token.value,
1301 gss_release_buffer(&min_stat, &name_token);
1303 if (!principal_string) {
1304 talloc_free(mem_ctx);
1305 return NT_STATUS_NO_MEMORY;
1308 maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1309 gensec_gssapi_state->gssapi_context,
1310 KRB5_AUTHDATA_WIN2K_PAC,
1314 if (maj_stat == 0) {
1315 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1316 gss_release_buffer(&min_stat, &pac);
1319 pac_blob = data_blob(NULL, 0);
1322 /* IF we have the PAC - otherwise we need to get this
1323 * data from elsewere - local ldb, or (TODO) lookup of some
1326 if (pac_blob.length) {
1327 krb5_error_code ret;
1328 union netr_Validation validation;
1330 maj_stat = gsskrb5_extract_authtime_from_sec_context(&min_stat,
1331 gensec_gssapi_state->gssapi_context,
1334 if (GSS_ERROR(maj_stat)) {
1335 DEBUG(1, ("gsskrb5_extract_authtime_from_sec_context: %s\n",
1336 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1337 talloc_free(mem_ctx);
1338 return NT_STATUS_FOOBAR;
1341 maj_stat = gsskrb5_extract_service_keyblock(&min_stat,
1342 gensec_gssapi_state->gssapi_context,
1345 if (GSS_ERROR(maj_stat)) {
1346 DEBUG(1, ("gsskrb5_copy_service_keyblock failed: %s\n",
1347 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1348 talloc_free(mem_ctx);
1349 return NT_STATUS_FOOBAR;
1352 ret = krb5_parse_name_flags(gensec_gssapi_state->smb_krb5_context->krb5_context,
1354 KRB5_PRINCIPAL_PARSE_MUST_REALM,
1357 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
1359 talloc_free(mem_ctx);
1360 return NT_STATUS_INVALID_PARAMETER;
1363 /* decode and verify the pac */
1364 nt_status = kerberos_pac_logon_info(mem_ctx, lp_iconv_convenience(gensec_security->lp_ctx), &logon_info, pac_blob,
1365 gensec_gssapi_state->smb_krb5_context->krb5_context,
1366 NULL, keyblock, principal, authtime, NULL);
1367 krb5_free_principal(gensec_gssapi_state->smb_krb5_context->krb5_context, principal);
1368 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
1371 if (!NT_STATUS_IS_OK(nt_status)) {
1372 talloc_free(mem_ctx);
1375 validation.sam3 = &logon_info->info3;
1376 nt_status = make_server_info_netlogon_validation(gensec_gssapi_state,
1380 if (!NT_STATUS_IS_OK(nt_status)) {
1381 talloc_free(mem_ctx);
1384 } else if (!lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec", "require_pac", false)) {
1385 DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1386 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1387 nt_status = sam_get_server_info_principal(mem_ctx, gensec_security->event_ctx, gensec_security->lp_ctx, principal_string,
1390 if (!NT_STATUS_IS_OK(nt_status)) {
1391 talloc_free(mem_ctx);
1395 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1397 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1398 return NT_STATUS_ACCESS_DENIED;
1401 /* references the server_info into the session_info */
1402 nt_status = auth_generate_session_info(mem_ctx, gensec_security->event_ctx, gensec_security->lp_ctx, server_info, &session_info);
1403 if (!NT_STATUS_IS_OK(nt_status)) {
1404 talloc_free(mem_ctx);
1408 nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1409 if (!NT_STATUS_IS_OK(nt_status)) {
1410 talloc_free(mem_ctx);
1414 if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1415 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1417 krb5_error_code ret;
1418 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1419 session_info->credentials = cli_credentials_init(session_info);
1420 if (!session_info->credentials) {
1421 talloc_free(mem_ctx);
1422 return NT_STATUS_NO_MEMORY;
1425 cli_credentials_set_conf(session_info->credentials, gensec_security->lp_ctx);
1426 /* Just so we don't segfault trying to get at a username */
1427 cli_credentials_set_anonymous(session_info->credentials);
1429 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1430 gensec_security->event_ctx,
1431 gensec_security->lp_ctx,
1432 gensec_gssapi_state->delegated_cred_handle,
1435 talloc_free(mem_ctx);
1436 return NT_STATUS_NO_MEMORY;
1439 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1440 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1442 /* It has been taken from this place... */
1443 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1445 talloc_steal(gensec_gssapi_state, session_info);
1446 talloc_free(mem_ctx);
1447 *_session_info = session_info;
1449 return NT_STATUS_OK;
1452 size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1454 struct gensec_gssapi_state *gensec_gssapi_state
1455 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1458 if (gensec_gssapi_state->sig_size) {
1459 return gensec_gssapi_state->sig_size;
1462 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1463 gensec_gssapi_state->sig_size = 45;
1465 gensec_gssapi_state->sig_size = 37;
1468 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1469 if (!NT_STATUS_IS_OK(status)) {
1470 return gensec_gssapi_state->sig_size;
1473 if (gensec_gssapi_state->lucid->protocol == 1) {
1474 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1476 * TODO: windows uses 76 here, but we don't know
1477 * gss_wrap works with aes keys yet
1479 gensec_gssapi_state->sig_size = 76;
1481 gensec_gssapi_state->sig_size = 28;
1483 } else if (gensec_gssapi_state->lucid->protocol == 0) {
1484 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1486 case KEYTYPE_ARCFOUR:
1487 case KEYTYPE_ARCFOUR_56:
1488 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1489 gensec_gssapi_state->sig_size = 45;
1491 gensec_gssapi_state->sig_size = 37;
1495 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1496 gensec_gssapi_state->sig_size = 57;
1498 gensec_gssapi_state->sig_size = 49;
1504 return gensec_gssapi_state->sig_size;
1507 static const char *gensec_gssapi_krb5_oids[] = {
1508 GENSEC_OID_KERBEROS5_OLD,
1509 GENSEC_OID_KERBEROS5,
1513 static const char *gensec_gssapi_spnego_oids[] = {
1518 /* As a server, this could in theory accept any GSSAPI mech */
1519 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1520 .name = "gssapi_spnego",
1521 .sasl_name = "GSS-SPNEGO",
1522 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1523 .oid = gensec_gssapi_spnego_oids,
1524 .client_start = gensec_gssapi_client_start,
1525 .server_start = gensec_gssapi_server_start,
1526 .magic = gensec_gssapi_magic,
1527 .update = gensec_gssapi_update,
1528 .session_key = gensec_gssapi_session_key,
1529 .session_info = gensec_gssapi_session_info,
1530 .sign_packet = gensec_gssapi_sign_packet,
1531 .check_packet = gensec_gssapi_check_packet,
1532 .seal_packet = gensec_gssapi_seal_packet,
1533 .unseal_packet = gensec_gssapi_unseal_packet,
1534 .wrap = gensec_gssapi_wrap,
1535 .unwrap = gensec_gssapi_unwrap,
1536 .have_feature = gensec_gssapi_have_feature,
1539 .priority = GENSEC_GSSAPI
1542 /* As a server, this could in theory accept any GSSAPI mech */
1543 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1544 .name = "gssapi_krb5",
1545 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1546 .oid = gensec_gssapi_krb5_oids,
1547 .client_start = gensec_gssapi_client_start,
1548 .server_start = gensec_gssapi_server_start,
1549 .magic = gensec_gssapi_magic,
1550 .update = gensec_gssapi_update,
1551 .session_key = gensec_gssapi_session_key,
1552 .session_info = gensec_gssapi_session_info,
1553 .sig_size = gensec_gssapi_sig_size,
1554 .sign_packet = gensec_gssapi_sign_packet,
1555 .check_packet = gensec_gssapi_check_packet,
1556 .seal_packet = gensec_gssapi_seal_packet,
1557 .unseal_packet = gensec_gssapi_unseal_packet,
1558 .wrap = gensec_gssapi_wrap,
1559 .unwrap = gensec_gssapi_unwrap,
1560 .have_feature = gensec_gssapi_have_feature,
1563 .priority = GENSEC_GSSAPI
1566 /* As a server, this could in theory accept any GSSAPI mech */
1567 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1568 .name = "gssapi_krb5_sasl",
1569 .sasl_name = "GSSAPI",
1570 .client_start = gensec_gssapi_sasl_client_start,
1571 .server_start = gensec_gssapi_sasl_server_start,
1572 .update = gensec_gssapi_update,
1573 .session_key = gensec_gssapi_session_key,
1574 .session_info = gensec_gssapi_session_info,
1575 .max_input_size = gensec_gssapi_max_input_size,
1576 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1577 .wrap = gensec_gssapi_wrap,
1578 .unwrap = gensec_gssapi_unwrap,
1579 .have_feature = gensec_gssapi_have_feature,
1582 .priority = GENSEC_GSSAPI
1585 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1589 ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1590 if (!NT_STATUS_IS_OK(ret)) {
1591 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1592 gensec_gssapi_spnego_security_ops.name));
1596 ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1597 if (!NT_STATUS_IS_OK(ret)) {
1598 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1599 gensec_gssapi_krb5_security_ops.name));
1603 ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1604 if (!NT_STATUS_IS_OK(ret)) {
1605 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1606 gensec_gssapi_sasl_krb5_security_ops.name));