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>
41 #include <gssapi/gssapi_spnego.h>
42 #include "auth/gensec/gensec_gssapi.h"
43 #include "lib/util/util_net.h"
45 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
46 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
48 static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
49 OM_uint32 maj_stat, OM_uint32 min_stat,
52 OM_uint32 disp_min_stat, disp_maj_stat;
53 gss_buffer_desc maj_error_message;
54 gss_buffer_desc min_error_message;
55 char *maj_error_string, *min_error_string;
56 OM_uint32 msg_ctx = 0;
60 maj_error_message.value = NULL;
61 min_error_message.value = NULL;
62 maj_error_message.length = 0;
63 min_error_message.length = 0;
65 disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
66 mech, &msg_ctx, &maj_error_message);
67 disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
68 mech, &msg_ctx, &min_error_message);
70 maj_error_string = talloc_strndup(mem_ctx, (char *)maj_error_message.value, maj_error_message.length);
72 min_error_string = talloc_strndup(mem_ctx, (char *)min_error_message.value, min_error_message.length);
74 ret = talloc_asprintf(mem_ctx, "%s: %s", maj_error_string, min_error_string);
76 talloc_free(maj_error_string);
77 talloc_free(min_error_string);
79 gss_release_buffer(&disp_min_stat, &maj_error_message);
80 gss_release_buffer(&disp_min_stat, &min_error_message);
86 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
88 OM_uint32 maj_stat, min_stat;
90 if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
91 maj_stat = gss_release_cred(&min_stat,
92 &gensec_gssapi_state->delegated_cred_handle);
95 if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
96 maj_stat = gss_delete_sec_context (&min_stat,
97 &gensec_gssapi_state->gssapi_context,
101 if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
102 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
104 if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
105 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
108 if (gensec_gssapi_state->lucid) {
109 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
115 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
117 OM_uint32 maj_stat, min_stat;
119 if (gensec_gssapi_state->lucid) {
123 maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
124 &gensec_gssapi_state->gssapi_context,
126 (void **)&gensec_gssapi_state->lucid);
127 if (maj_stat != GSS_S_COMPLETE) {
128 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
129 gssapi_error_string(gensec_gssapi_state,
131 gensec_gssapi_state->gss_oid)));
132 return NT_STATUS_INTERNAL_ERROR;
135 if (gensec_gssapi_state->lucid->version != 1) {
136 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
137 gensec_gssapi_state->lucid->version));
138 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
139 gensec_gssapi_state->lucid = NULL;
140 return NT_STATUS_INTERNAL_ERROR;
146 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
148 struct gensec_gssapi_state *gensec_gssapi_state;
150 struct gsskrb5_send_to_kdc send_to_kdc;
153 gensec_gssapi_state = talloc(gensec_security, struct gensec_gssapi_state);
154 if (!gensec_gssapi_state) {
155 return NT_STATUS_NO_MEMORY;
158 gensec_security->private_data = gensec_gssapi_state;
160 gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
162 /* TODO: Fill in channel bindings */
163 gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
165 gensec_gssapi_state->server_name = GSS_C_NO_NAME;
166 gensec_gssapi_state->client_name = GSS_C_NO_NAME;
168 gensec_gssapi_state->want_flags = 0;
170 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
171 gensec_gssapi_state->want_flags |= GSS_C_DELEG_POLICY_FLAG;
173 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
174 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
176 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
177 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
179 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
180 gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
182 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
183 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
186 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
187 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
189 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
190 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
192 if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
193 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
196 gensec_gssapi_state->got_flags = 0;
198 switch (gensec_security->ops->auth_type) {
199 case DCERPC_AUTH_TYPE_SPNEGO:
200 gensec_gssapi_state->gss_oid = gss_mech_spnego;
202 case DCERPC_AUTH_TYPE_KRB5:
204 gensec_gssapi_state->gss_oid = gss_mech_krb5;
208 gensec_gssapi_state->session_key = data_blob(NULL, 0);
209 gensec_gssapi_state->pac = data_blob(NULL, 0);
211 ret = smb_krb5_init_context(gensec_gssapi_state,
212 gensec_security->event_ctx,
213 gensec_security->settings->lp_ctx,
214 &gensec_gssapi_state->smb_krb5_context);
216 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
217 error_message(ret)));
218 talloc_free(gensec_gssapi_state);
219 return NT_STATUS_INTERNAL_ERROR;
222 gensec_gssapi_state->client_cred = NULL;
223 gensec_gssapi_state->server_cred = NULL;
225 gensec_gssapi_state->lucid = NULL;
227 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
229 gensec_gssapi_state->sasl = false;
230 gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
231 gensec_gssapi_state->sasl_protection = 0;
233 gensec_gssapi_state->max_wrap_buf_size
234 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
235 gensec_gssapi_state->gss_exchange_count = 0;
236 gensec_gssapi_state->sig_size = 0;
238 talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
240 send_to_kdc.func = smb_krb5_send_and_recv_func;
241 send_to_kdc.ptr = gensec_security->event_ctx;
243 ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
245 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
246 talloc_free(gensec_gssapi_state);
247 return NT_STATUS_INTERNAL_ERROR;
250 realm = lpcfg_realm(gensec_security->settings->lp_ctx);
252 ret = gsskrb5_set_default_realm(realm);
254 DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
255 talloc_free(gensec_gssapi_state);
256 return NT_STATUS_INTERNAL_ERROR;
260 /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
261 ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
263 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
264 talloc_free(gensec_gssapi_state);
265 return NT_STATUS_INTERNAL_ERROR;
271 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
275 struct gensec_gssapi_state *gensec_gssapi_state;
276 struct cli_credentials *machine_account;
277 struct gssapi_creds_container *gcc;
279 nt_status = gensec_gssapi_start(gensec_security);
280 if (!NT_STATUS_IS_OK(nt_status)) {
284 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
286 machine_account = gensec_get_credentials(gensec_security);
288 if (!machine_account) {
289 DEBUG(3, ("No machine account credentials specified\n"));
290 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
292 ret = cli_credentials_get_server_gss_creds(machine_account,
293 gensec_security->event_ctx,
294 gensec_security->settings->lp_ctx, &gcc);
296 DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
297 error_message(ret)));
298 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
302 gensec_gssapi_state->server_cred = gcc;
307 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
310 struct gensec_gssapi_state *gensec_gssapi_state;
311 nt_status = gensec_gssapi_server_start(gensec_security);
313 if (NT_STATUS_IS_OK(nt_status)) {
314 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
315 gensec_gssapi_state->sasl = true;
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);
326 gss_buffer_desc name_token;
328 OM_uint32 maj_stat, min_stat;
329 const char *hostname = gensec_get_target_hostname(gensec_security);
330 const char *principal;
331 struct gssapi_creds_container *gcc;
332 const char *error_string;
335 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
336 return NT_STATUS_INVALID_PARAMETER;
338 if (is_ipaddress(hostname)) {
339 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
340 return NT_STATUS_INVALID_PARAMETER;
342 if (strcmp(hostname, "localhost") == 0) {
343 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
344 return NT_STATUS_INVALID_PARAMETER;
347 nt_status = gensec_gssapi_start(gensec_security);
348 if (!NT_STATUS_IS_OK(nt_status)) {
352 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
354 principal = gensec_get_target_principal(gensec_security);
356 name_type = GSS_C_NULL_OID;
358 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, principal);
365 name_token.length = strlen(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;
379 ret = cli_credentials_get_client_gss_creds(creds,
380 gensec_security->event_ctx,
381 gensec_security->settings->lp_ctx, &gcc, &error_string);
385 case KRB5KDC_ERR_PREAUTH_FAILED:
386 return NT_STATUS_LOGON_FAILURE;
387 case KRB5_KDC_UNREACH:
388 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", principal, error_string));
389 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
390 case KRB5_CC_NOTFOUND:
392 DEBUG(3, ("Error preparing credentials we require to contact %s : %s\n", principal, error_string));
393 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
395 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
396 return NT_STATUS_UNSUCCESSFUL;
399 gensec_gssapi_state->client_cred = gcc;
400 if (!talloc_reference(gensec_gssapi_state, gcc)) {
401 return NT_STATUS_NO_MEMORY;
407 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
410 struct gensec_gssapi_state *gensec_gssapi_state;
411 nt_status = gensec_gssapi_client_start(gensec_security);
413 if (NT_STATUS_IS_OK(nt_status)) {
414 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
415 gensec_gssapi_state->sasl = true;
422 * Check if the packet is one for this mechansim
424 * @param gensec_security GENSEC state
425 * @param in The request, as a DATA_BLOB
426 * @return Error, INVALID_PARAMETER if it's not a packet for us
427 * or NT_STATUS_OK if the packet is ok.
430 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
433 if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
436 return NT_STATUS_INVALID_PARAMETER;
442 * Next state function for the GSSAPI GENSEC mechanism
444 * @param gensec_gssapi_state GSSAPI State
445 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
446 * @param in The request, as a DATA_BLOB
447 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
448 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
449 * or NT_STATUS_OK if the user is authenticated.
452 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
453 TALLOC_CTX *out_mem_ctx,
454 const DATA_BLOB in, DATA_BLOB *out)
456 struct gensec_gssapi_state *gensec_gssapi_state
457 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
458 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
459 OM_uint32 maj_stat, min_stat;
461 gss_buffer_desc input_token, output_token;
462 gss_OID gss_oid_p = NULL;
463 input_token.length = in.length;
464 input_token.value = in.data;
466 switch (gensec_gssapi_state->sasl_state) {
469 switch (gensec_security->gensec_role) {
472 maj_stat = gss_init_sec_context(&min_stat,
473 gensec_gssapi_state->client_cred->creds,
474 &gensec_gssapi_state->gssapi_context,
475 gensec_gssapi_state->server_name,
476 gensec_gssapi_state->gss_oid,
477 gensec_gssapi_state->want_flags,
479 gensec_gssapi_state->input_chan_bindings,
483 &gensec_gssapi_state->got_flags, /* ret flags */
486 gensec_gssapi_state->gss_oid = gss_oid_p;
492 maj_stat = gss_accept_sec_context(&min_stat,
493 &gensec_gssapi_state->gssapi_context,
494 gensec_gssapi_state->server_cred->creds,
496 gensec_gssapi_state->input_chan_bindings,
497 &gensec_gssapi_state->client_name,
500 &gensec_gssapi_state->got_flags,
502 &gensec_gssapi_state->delegated_cred_handle);
504 gensec_gssapi_state->gss_oid = gss_oid_p;
509 return NT_STATUS_INVALID_PARAMETER;
513 gensec_gssapi_state->gss_exchange_count++;
515 if (maj_stat == GSS_S_COMPLETE) {
516 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
517 gss_release_buffer(&min_stat2, &output_token);
519 if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
520 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
522 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
525 /* We may have been invoked as SASL, so there
526 * is more work to do */
527 if (gensec_gssapi_state->sasl) {
528 /* Due to a very subtle interaction
529 * with SASL and the LDAP libs, we
530 * must ensure the data pointer is
531 * != NULL, but the length is 0.
533 * This ensures we send a 'zero
534 * length' (rather than NULL) response
538 out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
541 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
542 return NT_STATUS_MORE_PROCESSING_REQUIRED;
544 gensec_gssapi_state->sasl_state = STAGE_DONE;
546 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
547 DEBUG(5, ("GSSAPI Connection will be cryptographicly sealed\n"));
548 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
549 DEBUG(5, ("GSSAPI Connection will be cryptographicly signed\n"));
551 DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
556 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
557 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
558 gss_release_buffer(&min_stat2, &output_token);
560 return NT_STATUS_MORE_PROCESSING_REQUIRED;
561 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
563 case KRB5_KDC_UNREACH:
564 DEBUG(3, ("Cannot reach a KDC we require: %s\n",
565 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
566 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
567 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
568 DEBUG(3, ("Server is not registered with our KDC: %s\n",
569 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
570 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
571 case KRB5KRB_AP_ERR_MSG_TYPE:
572 /* garbage input, possibly from the auto-mech detection */
573 return NT_STATUS_INVALID_PARAMETER;
575 DEBUG(1, ("GSS Update(krb5)(%d) Update failed: %s\n",
576 gensec_gssapi_state->gss_exchange_count,
577 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
581 DEBUG(1, ("GSS Update(%d) failed: %s\n",
582 gensec_gssapi_state->gss_exchange_count,
583 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
589 /* These last two stages are only done if we were invoked as SASL */
590 case STAGE_SASL_SSF_NEG:
592 switch (gensec_security->gensec_role) {
595 uint8_t maxlength_proposed[4];
596 uint8_t maxlength_accepted[4];
597 uint8_t security_supported;
600 input_token.length = in.length;
601 input_token.value = in.data;
603 /* As a client, we have just send a
604 * zero-length blob to the server (after the
605 * normal GSSAPI exchange), and it has replied
606 * with it's SASL negotiation */
608 maj_stat = gss_unwrap(&min_stat,
609 gensec_gssapi_state->gssapi_context,
614 if (GSS_ERROR(maj_stat)) {
615 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
616 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
617 return NT_STATUS_ACCESS_DENIED;
620 if (output_token.length < 4) {
621 return NT_STATUS_INVALID_PARAMETER;
624 memcpy(maxlength_proposed, output_token.value, 4);
625 gss_release_buffer(&min_stat, &output_token);
627 /* first byte is the proposed security */
628 security_supported = maxlength_proposed[0];
629 maxlength_proposed[0] = '\0';
631 /* Rest is the proposed max wrap length */
632 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
633 gensec_gssapi_state->max_wrap_buf_size);
634 gensec_gssapi_state->sasl_protection = 0;
635 if (security_supported & NEG_SEAL) {
636 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
637 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
640 if (security_supported & NEG_SIGN) {
641 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
642 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
645 if (security_supported & NEG_NONE) {
646 gensec_gssapi_state->sasl_protection |= NEG_NONE;
648 if (gensec_gssapi_state->sasl_protection == 0) {
649 DEBUG(1, ("Remote server does not support unprotected connections\n"));
650 return NT_STATUS_ACCESS_DENIED;
653 /* Send back the negotiated max length */
655 RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
657 maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
659 input_token.value = maxlength_accepted;
660 input_token.length = sizeof(maxlength_accepted);
662 maj_stat = gss_wrap(&min_stat,
663 gensec_gssapi_state->gssapi_context,
669 if (GSS_ERROR(maj_stat)) {
670 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
671 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
672 return NT_STATUS_ACCESS_DENIED;
675 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
676 gss_release_buffer(&min_stat, &output_token);
678 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
679 gensec_gssapi_state->sasl_state = STAGE_DONE;
681 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
682 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
683 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
684 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
686 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
693 uint8_t maxlength_proposed[4];
694 uint8_t security_supported = 0x0;
697 /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
698 if (in.length != 0) {
699 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
702 /* Give the client some idea what we will support */
704 RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
705 /* first byte is the proposed security */
706 maxlength_proposed[0] = '\0';
708 gensec_gssapi_state->sasl_protection = 0;
709 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
710 security_supported |= NEG_SEAL;
712 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
713 security_supported |= NEG_SIGN;
715 if (security_supported == 0) {
716 /* If we don't support anything, this must be 0 */
717 RSIVAL(maxlength_proposed, 0, 0x0);
720 /* TODO: We may not wish to support this */
721 security_supported |= NEG_NONE;
722 maxlength_proposed[0] = security_supported;
724 input_token.value = maxlength_proposed;
725 input_token.length = sizeof(maxlength_proposed);
727 maj_stat = gss_wrap(&min_stat,
728 gensec_gssapi_state->gssapi_context,
734 if (GSS_ERROR(maj_stat)) {
735 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
736 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
737 return NT_STATUS_ACCESS_DENIED;
740 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
741 gss_release_buffer(&min_stat, &output_token);
743 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
744 return NT_STATUS_MORE_PROCESSING_REQUIRED;
747 return NT_STATUS_INVALID_PARAMETER;
751 /* This is s server-only stage */
752 case STAGE_SASL_SSF_ACCEPT:
754 uint8_t maxlength_accepted[4];
755 uint8_t security_accepted;
758 input_token.length = in.length;
759 input_token.value = in.data;
761 maj_stat = gss_unwrap(&min_stat,
762 gensec_gssapi_state->gssapi_context,
767 if (GSS_ERROR(maj_stat)) {
768 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
769 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
770 return NT_STATUS_ACCESS_DENIED;
773 if (output_token.length < 4) {
774 return NT_STATUS_INVALID_PARAMETER;
777 memcpy(maxlength_accepted, output_token.value, 4);
778 gss_release_buffer(&min_stat, &output_token);
780 /* first byte is the proposed security */
781 security_accepted = maxlength_accepted[0];
782 maxlength_accepted[0] = '\0';
784 /* Rest is the proposed max wrap length */
785 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
786 gensec_gssapi_state->max_wrap_buf_size);
788 gensec_gssapi_state->sasl_protection = 0;
789 if (security_accepted & NEG_SEAL) {
790 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
791 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
792 return NT_STATUS_ACCESS_DENIED;
794 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
796 if (security_accepted & NEG_SIGN) {
797 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
798 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
799 return NT_STATUS_ACCESS_DENIED;
801 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
803 if (security_accepted & NEG_NONE) {
804 gensec_gssapi_state->sasl_protection |= NEG_NONE;
807 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
808 gensec_gssapi_state->sasl_state = STAGE_DONE;
809 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
810 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
811 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
812 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
814 DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
817 *out = data_blob(NULL, 0);
821 return NT_STATUS_INVALID_PARAMETER;
825 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
830 struct gensec_gssapi_state *gensec_gssapi_state
831 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
832 OM_uint32 maj_stat, min_stat;
833 gss_buffer_desc input_token, output_token;
835 input_token.length = in->length;
836 input_token.value = in->data;
838 maj_stat = gss_wrap(&min_stat,
839 gensec_gssapi_state->gssapi_context,
840 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
845 if (GSS_ERROR(maj_stat)) {
846 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
847 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
848 return NT_STATUS_ACCESS_DENIED;
851 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
852 gss_release_buffer(&min_stat, &output_token);
854 if (gensec_gssapi_state->sasl) {
855 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
856 if (max_wrapped_size < out->length) {
857 DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
858 (unsigned)in->length,
859 (unsigned)out->length,
860 (unsigned int)max_wrapped_size));
861 return NT_STATUS_INVALID_PARAMETER;
865 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
867 return NT_STATUS_ACCESS_DENIED;
872 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
877 struct gensec_gssapi_state *gensec_gssapi_state
878 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
879 OM_uint32 maj_stat, min_stat;
880 gss_buffer_desc input_token, output_token;
883 input_token.length = in->length;
884 input_token.value = in->data;
886 if (gensec_gssapi_state->sasl) {
887 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
888 if (max_wrapped_size < in->length) {
889 DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
890 return NT_STATUS_INVALID_PARAMETER;
894 maj_stat = gss_unwrap(&min_stat,
895 gensec_gssapi_state->gssapi_context,
900 if (GSS_ERROR(maj_stat)) {
901 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
902 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
903 return NT_STATUS_ACCESS_DENIED;
906 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
907 gss_release_buffer(&min_stat, &output_token);
909 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
911 return NT_STATUS_ACCESS_DENIED;
916 /* Find out the maximum input size negotiated on this connection */
918 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
920 struct gensec_gssapi_state *gensec_gssapi_state
921 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
922 OM_uint32 maj_stat, min_stat;
923 OM_uint32 max_input_size;
925 maj_stat = gss_wrap_size_limit(&min_stat,
926 gensec_gssapi_state->gssapi_context,
927 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
929 gensec_gssapi_state->max_wrap_buf_size,
931 if (GSS_ERROR(maj_stat)) {
932 TALLOC_CTX *mem_ctx = talloc_new(NULL);
933 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
934 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
935 talloc_free(mem_ctx);
939 return max_input_size;
942 /* Find out the maximum output size negotiated on this connection */
943 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
945 struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
946 return gensec_gssapi_state->max_wrap_buf_size;
949 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
951 uint8_t *data, size_t length,
952 const uint8_t *whole_pdu, size_t pdu_length,
955 struct gensec_gssapi_state *gensec_gssapi_state
956 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
957 OM_uint32 maj_stat, min_stat;
958 gss_buffer_desc input_token, output_token;
962 input_token.length = length;
963 input_token.value = data;
965 maj_stat = gss_wrap(&min_stat,
966 gensec_gssapi_state->gssapi_context,
967 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
972 if (GSS_ERROR(maj_stat)) {
973 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
974 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
975 return NT_STATUS_ACCESS_DENIED;
978 if (output_token.length < input_token.length) {
979 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
980 (long)output_token.length, (long)length));
981 return NT_STATUS_INTERNAL_ERROR;
983 sig_length = output_token.length - input_token.length;
985 memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
986 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
988 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
989 dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
990 dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
992 gss_release_buffer(&min_stat, &output_token);
994 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
996 return NT_STATUS_ACCESS_DENIED;
1001 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1002 TALLOC_CTX *mem_ctx,
1003 uint8_t *data, size_t length,
1004 const uint8_t *whole_pdu, size_t pdu_length,
1005 const DATA_BLOB *sig)
1007 struct gensec_gssapi_state *gensec_gssapi_state
1008 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1009 OM_uint32 maj_stat, min_stat;
1010 gss_buffer_desc input_token, output_token;
1012 gss_qop_t qop_state;
1015 dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1017 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1019 memcpy(in.data, sig->data, sig->length);
1020 memcpy(in.data + sig->length, data, length);
1022 input_token.length = in.length;
1023 input_token.value = in.data;
1025 maj_stat = gss_unwrap(&min_stat,
1026 gensec_gssapi_state->gssapi_context,
1031 if (GSS_ERROR(maj_stat)) {
1032 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1033 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1034 return NT_STATUS_ACCESS_DENIED;
1037 if (output_token.length != length) {
1038 return NT_STATUS_INTERNAL_ERROR;
1041 memcpy(data, output_token.value, length);
1043 gss_release_buffer(&min_stat, &output_token);
1045 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1047 return NT_STATUS_ACCESS_DENIED;
1049 return NT_STATUS_OK;
1052 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1053 TALLOC_CTX *mem_ctx,
1054 const uint8_t *data, size_t length,
1055 const uint8_t *whole_pdu, size_t pdu_length,
1058 struct gensec_gssapi_state *gensec_gssapi_state
1059 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1060 OM_uint32 maj_stat, min_stat;
1061 gss_buffer_desc input_token, output_token;
1063 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1064 input_token.length = pdu_length;
1065 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1067 input_token.length = length;
1068 input_token.value = discard_const_p(uint8_t *, data);
1071 maj_stat = gss_get_mic(&min_stat,
1072 gensec_gssapi_state->gssapi_context,
1076 if (GSS_ERROR(maj_stat)) {
1077 DEBUG(1, ("GSS GetMic failed: %s\n",
1078 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1079 return NT_STATUS_ACCESS_DENIED;
1082 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1084 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1086 gss_release_buffer(&min_stat, &output_token);
1088 return NT_STATUS_OK;
1091 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1092 TALLOC_CTX *mem_ctx,
1093 const uint8_t *data, size_t length,
1094 const uint8_t *whole_pdu, size_t pdu_length,
1095 const DATA_BLOB *sig)
1097 struct gensec_gssapi_state *gensec_gssapi_state
1098 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1099 OM_uint32 maj_stat, min_stat;
1100 gss_buffer_desc input_token;
1101 gss_buffer_desc input_message;
1102 gss_qop_t qop_state;
1104 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1106 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1107 input_message.length = pdu_length;
1108 input_message.value = discard_const(whole_pdu);
1110 input_message.length = length;
1111 input_message.value = discard_const(data);
1114 input_token.length = sig->length;
1115 input_token.value = sig->data;
1117 maj_stat = gss_verify_mic(&min_stat,
1118 gensec_gssapi_state->gssapi_context,
1122 if (GSS_ERROR(maj_stat)) {
1123 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1124 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1125 return NT_STATUS_ACCESS_DENIED;
1128 return NT_STATUS_OK;
1131 /* Try to figure out what features we actually got on the connection */
1132 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1135 struct gensec_gssapi_state *gensec_gssapi_state
1136 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1137 if (feature & GENSEC_FEATURE_SIGN) {
1138 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1139 if (gensec_gssapi_state->sasl
1140 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1141 return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1142 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1144 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1146 if (feature & GENSEC_FEATURE_SEAL) {
1147 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1148 if (gensec_gssapi_state->sasl
1149 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1150 return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1151 && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1153 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1155 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1156 /* Only for GSSAPI/Krb5 */
1157 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1161 if (feature & GENSEC_FEATURE_DCE_STYLE) {
1162 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1164 if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1167 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1171 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1174 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1178 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1179 if (!NT_STATUS_IS_OK(status)) {
1183 if (gensec_gssapi_state->lucid->protocol == 1) {
1189 /* We can always do async (rather than strict request/reply) packets. */
1190 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1197 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1198 * (for encrypting some passwords).
1200 * This breaks all the abstractions, but what do you expect...
1202 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1203 DATA_BLOB *session_key)
1205 struct gensec_gssapi_state *gensec_gssapi_state
1206 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1207 OM_uint32 maj_stat, min_stat;
1208 krb5_keyblock *subkey;
1210 if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1211 return NT_STATUS_NO_USER_SESSION_KEY;
1214 if (gensec_gssapi_state->session_key.data) {
1215 *session_key = gensec_gssapi_state->session_key;
1216 return NT_STATUS_OK;
1219 maj_stat = gsskrb5_get_subkey(&min_stat,
1220 gensec_gssapi_state->gssapi_context,
1222 if (maj_stat != 0) {
1223 DEBUG(1, ("NO session key for this mech\n"));
1224 return NT_STATUS_NO_USER_SESSION_KEY;
1227 DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1228 (int)KRB5_KEY_LENGTH(subkey),
1229 (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1230 *session_key = data_blob_talloc(gensec_gssapi_state,
1231 KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1232 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1233 gensec_gssapi_state->session_key = *session_key;
1234 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1236 return NT_STATUS_OK;
1239 /* Get some basic (and authorization) information about the user on
1240 * this session. This uses either the PAC (if present) or a local
1241 * database lookup */
1242 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1243 struct auth_session_info **_session_info)
1246 TALLOC_CTX *mem_ctx;
1247 struct gensec_gssapi_state *gensec_gssapi_state
1248 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1249 struct auth_serversupplied_info *server_info = NULL;
1250 struct auth_session_info *session_info = NULL;
1251 OM_uint32 maj_stat, min_stat;
1252 gss_buffer_desc pac;
1255 if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1256 || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1257 gensec_gssapi_state->gss_oid->length) != 0)) {
1258 DEBUG(1, ("NO session info available for this mech\n"));
1259 return NT_STATUS_INVALID_PARAMETER;
1262 mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1263 NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1265 maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1266 gensec_gssapi_state->gssapi_context,
1267 KRB5_AUTHDATA_WIN2K_PAC,
1271 if (maj_stat == 0) {
1272 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1273 gss_release_buffer(&min_stat, &pac);
1276 pac_blob = data_blob(NULL, 0);
1279 /* IF we have the PAC - otherwise we need to get this
1280 * data from elsewere - local ldb, or (TODO) lookup of some
1283 if (pac_blob.length) {
1284 nt_status = kerberos_pac_blob_to_server_info(mem_ctx,
1286 gensec_gssapi_state->smb_krb5_context->krb5_context,
1288 if (!NT_STATUS_IS_OK(nt_status)) {
1289 talloc_free(mem_ctx);
1293 gss_buffer_desc name_token;
1294 char *principal_string;
1296 maj_stat = gss_display_name (&min_stat,
1297 gensec_gssapi_state->client_name,
1300 if (GSS_ERROR(maj_stat)) {
1301 DEBUG(1, ("GSS display_name failed: %s\n",
1302 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1303 talloc_free(mem_ctx);
1304 return NT_STATUS_FOOBAR;
1307 principal_string = talloc_strndup(mem_ctx,
1308 (const char *)name_token.value,
1311 gss_release_buffer(&min_stat, &name_token);
1313 if (!principal_string) {
1314 talloc_free(mem_ctx);
1315 return NT_STATUS_NO_MEMORY;
1318 if (gensec_security->auth_context &&
1319 !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1320 DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1321 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1322 nt_status = gensec_security->auth_context->get_server_info_principal(mem_ctx,
1323 gensec_security->auth_context,
1328 if (!NT_STATUS_IS_OK(nt_status)) {
1329 talloc_free(mem_ctx);
1333 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1335 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1336 return NT_STATUS_ACCESS_DENIED;
1340 /* references the server_info into the session_info */
1341 nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1342 server_info, &session_info);
1343 if (!NT_STATUS_IS_OK(nt_status)) {
1344 talloc_free(mem_ctx);
1348 nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1349 if (!NT_STATUS_IS_OK(nt_status)) {
1350 talloc_free(mem_ctx);
1354 if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1355 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1357 krb5_error_code ret;
1358 const char *error_string;
1360 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1361 session_info->credentials = cli_credentials_init(session_info);
1362 if (!session_info->credentials) {
1363 talloc_free(mem_ctx);
1364 return NT_STATUS_NO_MEMORY;
1367 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1368 /* Just so we don't segfault trying to get at a username */
1369 cli_credentials_set_anonymous(session_info->credentials);
1371 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1372 gensec_security->event_ctx,
1373 gensec_security->settings->lp_ctx,
1374 gensec_gssapi_state->delegated_cred_handle,
1375 CRED_SPECIFIED, &error_string);
1377 talloc_free(mem_ctx);
1378 DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1379 return NT_STATUS_NO_MEMORY;
1382 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1383 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1385 /* It has been taken from this place... */
1386 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1388 talloc_steal(gensec_gssapi_state, session_info);
1389 talloc_free(mem_ctx);
1390 *_session_info = session_info;
1392 return NT_STATUS_OK;
1395 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1397 struct gensec_gssapi_state *gensec_gssapi_state
1398 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1401 if (gensec_gssapi_state->sig_size) {
1402 return gensec_gssapi_state->sig_size;
1405 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1406 gensec_gssapi_state->sig_size = 45;
1408 gensec_gssapi_state->sig_size = 37;
1411 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1412 if (!NT_STATUS_IS_OK(status)) {
1413 return gensec_gssapi_state->sig_size;
1416 if (gensec_gssapi_state->lucid->protocol == 1) {
1417 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1419 * TODO: windows uses 76 here, but we don't know
1420 * gss_wrap works with aes keys yet
1422 gensec_gssapi_state->sig_size = 76;
1424 gensec_gssapi_state->sig_size = 28;
1426 } else if (gensec_gssapi_state->lucid->protocol == 0) {
1427 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1429 case KEYTYPE_ARCFOUR:
1430 case KEYTYPE_ARCFOUR_56:
1431 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1432 gensec_gssapi_state->sig_size = 45;
1434 gensec_gssapi_state->sig_size = 37;
1438 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1439 gensec_gssapi_state->sig_size = 57;
1441 gensec_gssapi_state->sig_size = 49;
1447 return gensec_gssapi_state->sig_size;
1450 static const char *gensec_gssapi_krb5_oids[] = {
1451 GENSEC_OID_KERBEROS5_OLD,
1452 GENSEC_OID_KERBEROS5,
1456 static const char *gensec_gssapi_spnego_oids[] = {
1461 /* As a server, this could in theory accept any GSSAPI mech */
1462 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1463 .name = "gssapi_spnego",
1464 .sasl_name = "GSS-SPNEGO",
1465 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1466 .oid = gensec_gssapi_spnego_oids,
1467 .client_start = gensec_gssapi_client_start,
1468 .server_start = gensec_gssapi_server_start,
1469 .magic = gensec_gssapi_magic,
1470 .update = gensec_gssapi_update,
1471 .session_key = gensec_gssapi_session_key,
1472 .session_info = gensec_gssapi_session_info,
1473 .sign_packet = gensec_gssapi_sign_packet,
1474 .check_packet = gensec_gssapi_check_packet,
1475 .seal_packet = gensec_gssapi_seal_packet,
1476 .unseal_packet = gensec_gssapi_unseal_packet,
1477 .wrap = gensec_gssapi_wrap,
1478 .unwrap = gensec_gssapi_unwrap,
1479 .have_feature = gensec_gssapi_have_feature,
1482 .priority = GENSEC_GSSAPI
1485 /* As a server, this could in theory accept any GSSAPI mech */
1486 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1487 .name = "gssapi_krb5",
1488 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1489 .oid = gensec_gssapi_krb5_oids,
1490 .client_start = gensec_gssapi_client_start,
1491 .server_start = gensec_gssapi_server_start,
1492 .magic = gensec_gssapi_magic,
1493 .update = gensec_gssapi_update,
1494 .session_key = gensec_gssapi_session_key,
1495 .session_info = gensec_gssapi_session_info,
1496 .sig_size = gensec_gssapi_sig_size,
1497 .sign_packet = gensec_gssapi_sign_packet,
1498 .check_packet = gensec_gssapi_check_packet,
1499 .seal_packet = gensec_gssapi_seal_packet,
1500 .unseal_packet = gensec_gssapi_unseal_packet,
1501 .wrap = gensec_gssapi_wrap,
1502 .unwrap = gensec_gssapi_unwrap,
1503 .have_feature = gensec_gssapi_have_feature,
1506 .priority = GENSEC_GSSAPI
1509 /* As a server, this could in theory accept any GSSAPI mech */
1510 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1511 .name = "gssapi_krb5_sasl",
1512 .sasl_name = "GSSAPI",
1513 .client_start = gensec_gssapi_sasl_client_start,
1514 .server_start = gensec_gssapi_sasl_server_start,
1515 .update = gensec_gssapi_update,
1516 .session_key = gensec_gssapi_session_key,
1517 .session_info = gensec_gssapi_session_info,
1518 .max_input_size = gensec_gssapi_max_input_size,
1519 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1520 .wrap = gensec_gssapi_wrap,
1521 .unwrap = gensec_gssapi_unwrap,
1522 .have_feature = gensec_gssapi_have_feature,
1525 .priority = GENSEC_GSSAPI
1528 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1532 ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1533 if (!NT_STATUS_IS_OK(ret)) {
1534 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1535 gensec_gssapi_spnego_security_ops.name));
1539 ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1540 if (!NT_STATUS_IS_OK(ret)) {
1541 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1542 gensec_gssapi_krb5_security_ops.name));
1546 ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1547 if (!NT_STATUS_IS_OK(ret)) {
1548 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1549 gensec_gssapi_sasl_krb5_security_ops.name));