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);
355 if (principal && lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
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 (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
636 if (security_supported & NEG_SEAL) {
637 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
639 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
640 if (security_supported & NEG_SIGN) {
641 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
643 } else if (security_supported & NEG_NONE) {
644 gensec_gssapi_state->sasl_protection |= NEG_NONE;
646 DEBUG(1, ("Remote server does not support unprotected connections"));
647 return NT_STATUS_ACCESS_DENIED;
650 /* Send back the negotiated max length */
652 RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
654 maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
656 input_token.value = maxlength_accepted;
657 input_token.length = sizeof(maxlength_accepted);
659 maj_stat = gss_wrap(&min_stat,
660 gensec_gssapi_state->gssapi_context,
666 if (GSS_ERROR(maj_stat)) {
667 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
668 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
669 return NT_STATUS_ACCESS_DENIED;
672 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
673 gss_release_buffer(&min_stat, &output_token);
675 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
676 gensec_gssapi_state->sasl_state = STAGE_DONE;
678 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
679 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
680 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
681 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
683 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
690 uint8_t maxlength_proposed[4];
691 uint8_t security_supported = 0x0;
694 /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
695 if (in.length != 0) {
696 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
699 /* Give the client some idea what we will support */
701 RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
702 /* first byte is the proposed security */
703 maxlength_proposed[0] = '\0';
705 gensec_gssapi_state->sasl_protection = 0;
706 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
707 security_supported |= NEG_SEAL;
709 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
710 security_supported |= NEG_SIGN;
712 if (security_supported == 0) {
713 /* If we don't support anything, this must be 0 */
714 RSIVAL(maxlength_proposed, 0, 0x0);
717 /* TODO: We may not wish to support this */
718 security_supported |= NEG_NONE;
719 maxlength_proposed[0] = security_supported;
721 input_token.value = maxlength_proposed;
722 input_token.length = sizeof(maxlength_proposed);
724 maj_stat = gss_wrap(&min_stat,
725 gensec_gssapi_state->gssapi_context,
731 if (GSS_ERROR(maj_stat)) {
732 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
733 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
734 return NT_STATUS_ACCESS_DENIED;
737 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
738 gss_release_buffer(&min_stat, &output_token);
740 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
741 return NT_STATUS_MORE_PROCESSING_REQUIRED;
744 return NT_STATUS_INVALID_PARAMETER;
748 /* This is s server-only stage */
749 case STAGE_SASL_SSF_ACCEPT:
751 uint8_t maxlength_accepted[4];
752 uint8_t security_accepted;
755 input_token.length = in.length;
756 input_token.value = in.data;
758 maj_stat = gss_unwrap(&min_stat,
759 gensec_gssapi_state->gssapi_context,
764 if (GSS_ERROR(maj_stat)) {
765 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
766 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
767 return NT_STATUS_ACCESS_DENIED;
770 if (output_token.length < 4) {
771 return NT_STATUS_INVALID_PARAMETER;
774 memcpy(maxlength_accepted, output_token.value, 4);
775 gss_release_buffer(&min_stat, &output_token);
777 /* first byte is the proposed security */
778 security_accepted = maxlength_accepted[0];
779 maxlength_accepted[0] = '\0';
781 /* Rest is the proposed max wrap length */
782 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
783 gensec_gssapi_state->max_wrap_buf_size);
785 gensec_gssapi_state->sasl_protection = 0;
786 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
787 if (security_accepted & NEG_SEAL) {
788 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
790 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
791 if (security_accepted & NEG_SIGN) {
792 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
794 } else if (security_accepted & NEG_NONE) {
795 gensec_gssapi_state->sasl_protection |= NEG_NONE;
797 DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
798 return NT_STATUS_ACCESS_DENIED;
801 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
802 gensec_gssapi_state->sasl_state = STAGE_DONE;
803 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
804 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
805 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
806 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
808 DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
811 *out = data_blob(NULL, 0);
815 return NT_STATUS_INVALID_PARAMETER;
819 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
824 struct gensec_gssapi_state *gensec_gssapi_state
825 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
826 OM_uint32 maj_stat, min_stat;
827 gss_buffer_desc input_token, output_token;
829 input_token.length = in->length;
830 input_token.value = in->data;
832 maj_stat = gss_wrap(&min_stat,
833 gensec_gssapi_state->gssapi_context,
834 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
839 if (GSS_ERROR(maj_stat)) {
840 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
841 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
842 return NT_STATUS_ACCESS_DENIED;
845 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
846 gss_release_buffer(&min_stat, &output_token);
848 if (gensec_gssapi_state->sasl) {
849 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
850 if (max_wrapped_size < out->length) {
851 DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
852 (unsigned)in->length,
853 (unsigned)out->length,
854 (unsigned int)max_wrapped_size));
855 return NT_STATUS_INVALID_PARAMETER;
859 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
861 return NT_STATUS_ACCESS_DENIED;
866 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
871 struct gensec_gssapi_state *gensec_gssapi_state
872 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
873 OM_uint32 maj_stat, min_stat;
874 gss_buffer_desc input_token, output_token;
877 input_token.length = in->length;
878 input_token.value = in->data;
880 if (gensec_gssapi_state->sasl) {
881 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
882 if (max_wrapped_size < in->length) {
883 DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
884 return NT_STATUS_INVALID_PARAMETER;
888 maj_stat = gss_unwrap(&min_stat,
889 gensec_gssapi_state->gssapi_context,
894 if (GSS_ERROR(maj_stat)) {
895 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
896 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
897 return NT_STATUS_ACCESS_DENIED;
900 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
901 gss_release_buffer(&min_stat, &output_token);
903 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
905 return NT_STATUS_ACCESS_DENIED;
910 /* Find out the maximum input size negotiated on this connection */
912 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
914 struct gensec_gssapi_state *gensec_gssapi_state
915 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
916 OM_uint32 maj_stat, min_stat;
917 OM_uint32 max_input_size;
919 maj_stat = gss_wrap_size_limit(&min_stat,
920 gensec_gssapi_state->gssapi_context,
921 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
923 gensec_gssapi_state->max_wrap_buf_size,
925 if (GSS_ERROR(maj_stat)) {
926 TALLOC_CTX *mem_ctx = talloc_new(NULL);
927 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
928 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
929 talloc_free(mem_ctx);
933 return max_input_size;
936 /* Find out the maximum output size negotiated on this connection */
937 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
939 struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
940 return gensec_gssapi_state->max_wrap_buf_size;
943 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
945 uint8_t *data, size_t length,
946 const uint8_t *whole_pdu, size_t pdu_length,
949 struct gensec_gssapi_state *gensec_gssapi_state
950 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
951 OM_uint32 maj_stat, min_stat;
952 gss_buffer_desc input_token, output_token;
956 input_token.length = length;
957 input_token.value = data;
959 maj_stat = gss_wrap(&min_stat,
960 gensec_gssapi_state->gssapi_context,
961 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
966 if (GSS_ERROR(maj_stat)) {
967 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
968 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
969 return NT_STATUS_ACCESS_DENIED;
972 if (output_token.length < input_token.length) {
973 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
974 (long)output_token.length, (long)length));
975 return NT_STATUS_INTERNAL_ERROR;
977 sig_length = output_token.length - input_token.length;
979 memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
980 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
982 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
983 dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
984 dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
986 gss_release_buffer(&min_stat, &output_token);
988 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
990 return NT_STATUS_ACCESS_DENIED;
995 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
997 uint8_t *data, size_t length,
998 const uint8_t *whole_pdu, size_t pdu_length,
999 const DATA_BLOB *sig)
1001 struct gensec_gssapi_state *gensec_gssapi_state
1002 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1003 OM_uint32 maj_stat, min_stat;
1004 gss_buffer_desc input_token, output_token;
1006 gss_qop_t qop_state;
1009 dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1011 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1013 memcpy(in.data, sig->data, sig->length);
1014 memcpy(in.data + sig->length, data, length);
1016 input_token.length = in.length;
1017 input_token.value = in.data;
1019 maj_stat = gss_unwrap(&min_stat,
1020 gensec_gssapi_state->gssapi_context,
1025 if (GSS_ERROR(maj_stat)) {
1026 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1027 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1028 return NT_STATUS_ACCESS_DENIED;
1031 if (output_token.length != length) {
1032 return NT_STATUS_INTERNAL_ERROR;
1035 memcpy(data, output_token.value, length);
1037 gss_release_buffer(&min_stat, &output_token);
1039 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1041 return NT_STATUS_ACCESS_DENIED;
1043 return NT_STATUS_OK;
1046 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1047 TALLOC_CTX *mem_ctx,
1048 const uint8_t *data, size_t length,
1049 const uint8_t *whole_pdu, size_t pdu_length,
1052 struct gensec_gssapi_state *gensec_gssapi_state
1053 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1054 OM_uint32 maj_stat, min_stat;
1055 gss_buffer_desc input_token, output_token;
1057 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1058 input_token.length = pdu_length;
1059 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1061 input_token.length = length;
1062 input_token.value = discard_const_p(uint8_t *, data);
1065 maj_stat = gss_get_mic(&min_stat,
1066 gensec_gssapi_state->gssapi_context,
1070 if (GSS_ERROR(maj_stat)) {
1071 DEBUG(1, ("GSS GetMic failed: %s\n",
1072 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1073 return NT_STATUS_ACCESS_DENIED;
1076 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1078 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1080 gss_release_buffer(&min_stat, &output_token);
1082 return NT_STATUS_OK;
1085 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1086 TALLOC_CTX *mem_ctx,
1087 const uint8_t *data, size_t length,
1088 const uint8_t *whole_pdu, size_t pdu_length,
1089 const DATA_BLOB *sig)
1091 struct gensec_gssapi_state *gensec_gssapi_state
1092 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1093 OM_uint32 maj_stat, min_stat;
1094 gss_buffer_desc input_token;
1095 gss_buffer_desc input_message;
1096 gss_qop_t qop_state;
1098 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1100 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1101 input_message.length = pdu_length;
1102 input_message.value = discard_const(whole_pdu);
1104 input_message.length = length;
1105 input_message.value = discard_const(data);
1108 input_token.length = sig->length;
1109 input_token.value = sig->data;
1111 maj_stat = gss_verify_mic(&min_stat,
1112 gensec_gssapi_state->gssapi_context,
1116 if (GSS_ERROR(maj_stat)) {
1117 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1118 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1119 return NT_STATUS_ACCESS_DENIED;
1122 return NT_STATUS_OK;
1125 /* Try to figure out what features we actually got on the connection */
1126 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1129 struct gensec_gssapi_state *gensec_gssapi_state
1130 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1131 if (feature & GENSEC_FEATURE_SIGN) {
1132 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1133 if (gensec_gssapi_state->sasl
1134 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1135 return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1136 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1138 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1140 if (feature & GENSEC_FEATURE_SEAL) {
1141 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1142 if (gensec_gssapi_state->sasl
1143 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1144 return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1145 && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1147 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1149 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1150 /* Only for GSSAPI/Krb5 */
1151 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1155 if (feature & GENSEC_FEATURE_DCE_STYLE) {
1156 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1158 if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1161 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1165 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1168 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1172 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1173 if (!NT_STATUS_IS_OK(status)) {
1177 if (gensec_gssapi_state->lucid->protocol == 1) {
1183 /* We can always do async (rather than strict request/reply) packets. */
1184 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1191 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1192 * (for encrypting some passwords).
1194 * This breaks all the abstractions, but what do you expect...
1196 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1197 DATA_BLOB *session_key)
1199 struct gensec_gssapi_state *gensec_gssapi_state
1200 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1201 OM_uint32 maj_stat, min_stat;
1202 krb5_keyblock *subkey;
1204 if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1205 return NT_STATUS_NO_USER_SESSION_KEY;
1208 if (gensec_gssapi_state->session_key.data) {
1209 *session_key = gensec_gssapi_state->session_key;
1210 return NT_STATUS_OK;
1213 maj_stat = gsskrb5_get_subkey(&min_stat,
1214 gensec_gssapi_state->gssapi_context,
1216 if (maj_stat != 0) {
1217 DEBUG(1, ("NO session key for this mech\n"));
1218 return NT_STATUS_NO_USER_SESSION_KEY;
1221 DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1222 (int)KRB5_KEY_LENGTH(subkey),
1223 (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1224 *session_key = data_blob_talloc(gensec_gssapi_state,
1225 KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1226 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1227 gensec_gssapi_state->session_key = *session_key;
1228 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1230 return NT_STATUS_OK;
1233 /* Get some basic (and authorization) information about the user on
1234 * this session. This uses either the PAC (if present) or a local
1235 * database lookup */
1236 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1237 struct auth_session_info **_session_info)
1240 TALLOC_CTX *mem_ctx;
1241 struct gensec_gssapi_state *gensec_gssapi_state
1242 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1243 struct auth_serversupplied_info *server_info = NULL;
1244 struct auth_session_info *session_info = NULL;
1245 OM_uint32 maj_stat, min_stat;
1246 gss_buffer_desc pac;
1249 if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1250 || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1251 gensec_gssapi_state->gss_oid->length) != 0)) {
1252 DEBUG(1, ("NO session info available for this mech\n"));
1253 return NT_STATUS_INVALID_PARAMETER;
1256 mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1257 NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1259 maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1260 gensec_gssapi_state->gssapi_context,
1261 KRB5_AUTHDATA_WIN2K_PAC,
1265 if (maj_stat == 0) {
1266 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1267 gss_release_buffer(&min_stat, &pac);
1270 pac_blob = data_blob(NULL, 0);
1273 /* IF we have the PAC - otherwise we need to get this
1274 * data from elsewere - local ldb, or (TODO) lookup of some
1277 if (pac_blob.length) {
1278 nt_status = kerberos_pac_blob_to_server_info(mem_ctx,
1280 gensec_gssapi_state->smb_krb5_context->krb5_context,
1282 if (!NT_STATUS_IS_OK(nt_status)) {
1283 talloc_free(mem_ctx);
1287 gss_buffer_desc name_token;
1288 char *principal_string;
1290 maj_stat = gss_display_name (&min_stat,
1291 gensec_gssapi_state->client_name,
1294 if (GSS_ERROR(maj_stat)) {
1295 DEBUG(1, ("GSS display_name failed: %s\n",
1296 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1297 talloc_free(mem_ctx);
1298 return NT_STATUS_FOOBAR;
1301 principal_string = talloc_strndup(mem_ctx,
1302 (const char *)name_token.value,
1305 gss_release_buffer(&min_stat, &name_token);
1307 if (!principal_string) {
1308 talloc_free(mem_ctx);
1309 return NT_STATUS_NO_MEMORY;
1312 if (gensec_security->auth_context &&
1313 !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1314 DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1315 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1316 nt_status = gensec_security->auth_context->get_server_info_principal(mem_ctx,
1317 gensec_security->auth_context,
1322 if (!NT_STATUS_IS_OK(nt_status)) {
1323 talloc_free(mem_ctx);
1327 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1329 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1330 return NT_STATUS_ACCESS_DENIED;
1334 /* references the server_info into the session_info */
1335 nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1336 server_info, &session_info);
1337 if (!NT_STATUS_IS_OK(nt_status)) {
1338 talloc_free(mem_ctx);
1342 nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1343 if (!NT_STATUS_IS_OK(nt_status)) {
1344 talloc_free(mem_ctx);
1348 if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1349 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1351 krb5_error_code ret;
1352 const char *error_string;
1354 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1355 session_info->credentials = cli_credentials_init(session_info);
1356 if (!session_info->credentials) {
1357 talloc_free(mem_ctx);
1358 return NT_STATUS_NO_MEMORY;
1361 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1362 /* Just so we don't segfault trying to get at a username */
1363 cli_credentials_set_anonymous(session_info->credentials);
1365 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1366 gensec_security->event_ctx,
1367 gensec_security->settings->lp_ctx,
1368 gensec_gssapi_state->delegated_cred_handle,
1369 CRED_SPECIFIED, &error_string);
1371 talloc_free(mem_ctx);
1372 DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1373 return NT_STATUS_NO_MEMORY;
1376 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1377 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1379 /* It has been taken from this place... */
1380 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1382 talloc_steal(gensec_gssapi_state, session_info);
1383 talloc_free(mem_ctx);
1384 *_session_info = session_info;
1386 return NT_STATUS_OK;
1389 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1391 struct gensec_gssapi_state *gensec_gssapi_state
1392 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1395 if (gensec_gssapi_state->sig_size) {
1396 return gensec_gssapi_state->sig_size;
1399 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1400 gensec_gssapi_state->sig_size = 45;
1402 gensec_gssapi_state->sig_size = 37;
1405 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1406 if (!NT_STATUS_IS_OK(status)) {
1407 return gensec_gssapi_state->sig_size;
1410 if (gensec_gssapi_state->lucid->protocol == 1) {
1411 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1413 * TODO: windows uses 76 here, but we don't know
1414 * gss_wrap works with aes keys yet
1416 gensec_gssapi_state->sig_size = 76;
1418 gensec_gssapi_state->sig_size = 28;
1420 } else if (gensec_gssapi_state->lucid->protocol == 0) {
1421 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1423 case KEYTYPE_ARCFOUR:
1424 case KEYTYPE_ARCFOUR_56:
1425 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1426 gensec_gssapi_state->sig_size = 45;
1428 gensec_gssapi_state->sig_size = 37;
1432 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1433 gensec_gssapi_state->sig_size = 57;
1435 gensec_gssapi_state->sig_size = 49;
1441 return gensec_gssapi_state->sig_size;
1444 static const char *gensec_gssapi_krb5_oids[] = {
1445 GENSEC_OID_KERBEROS5_OLD,
1446 GENSEC_OID_KERBEROS5,
1450 static const char *gensec_gssapi_spnego_oids[] = {
1455 /* As a server, this could in theory accept any GSSAPI mech */
1456 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1457 .name = "gssapi_spnego",
1458 .sasl_name = "GSS-SPNEGO",
1459 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1460 .oid = gensec_gssapi_spnego_oids,
1461 .client_start = gensec_gssapi_client_start,
1462 .server_start = gensec_gssapi_server_start,
1463 .magic = gensec_gssapi_magic,
1464 .update = gensec_gssapi_update,
1465 .session_key = gensec_gssapi_session_key,
1466 .session_info = gensec_gssapi_session_info,
1467 .sign_packet = gensec_gssapi_sign_packet,
1468 .check_packet = gensec_gssapi_check_packet,
1469 .seal_packet = gensec_gssapi_seal_packet,
1470 .unseal_packet = gensec_gssapi_unseal_packet,
1471 .wrap = gensec_gssapi_wrap,
1472 .unwrap = gensec_gssapi_unwrap,
1473 .have_feature = gensec_gssapi_have_feature,
1476 .priority = GENSEC_GSSAPI
1479 /* As a server, this could in theory accept any GSSAPI mech */
1480 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1481 .name = "gssapi_krb5",
1482 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1483 .oid = gensec_gssapi_krb5_oids,
1484 .client_start = gensec_gssapi_client_start,
1485 .server_start = gensec_gssapi_server_start,
1486 .magic = gensec_gssapi_magic,
1487 .update = gensec_gssapi_update,
1488 .session_key = gensec_gssapi_session_key,
1489 .session_info = gensec_gssapi_session_info,
1490 .sig_size = gensec_gssapi_sig_size,
1491 .sign_packet = gensec_gssapi_sign_packet,
1492 .check_packet = gensec_gssapi_check_packet,
1493 .seal_packet = gensec_gssapi_seal_packet,
1494 .unseal_packet = gensec_gssapi_unseal_packet,
1495 .wrap = gensec_gssapi_wrap,
1496 .unwrap = gensec_gssapi_unwrap,
1497 .have_feature = gensec_gssapi_have_feature,
1500 .priority = GENSEC_GSSAPI
1503 /* As a server, this could in theory accept any GSSAPI mech */
1504 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1505 .name = "gssapi_krb5_sasl",
1506 .sasl_name = "GSSAPI",
1507 .client_start = gensec_gssapi_sasl_client_start,
1508 .server_start = gensec_gssapi_sasl_server_start,
1509 .update = gensec_gssapi_update,
1510 .session_key = gensec_gssapi_session_key,
1511 .session_info = gensec_gssapi_session_info,
1512 .max_input_size = gensec_gssapi_max_input_size,
1513 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1514 .wrap = gensec_gssapi_wrap,
1515 .unwrap = gensec_gssapi_unwrap,
1516 .have_feature = gensec_gssapi_have_feature,
1519 .priority = GENSEC_GSSAPI
1522 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1526 ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1527 if (!NT_STATUS_IS_OK(ret)) {
1528 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1529 gensec_gssapi_spnego_security_ops.name));
1533 ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1534 if (!NT_STATUS_IS_OK(ret)) {
1535 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1536 gensec_gssapi_krb5_security_ops.name));
1540 ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1541 if (!NT_STATUS_IS_OK(ret)) {
1542 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1543 gensec_gssapi_sasl_krb5_security_ops.name));