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;
152 gensec_gssapi_state = talloc(gensec_security, struct gensec_gssapi_state);
153 if (!gensec_gssapi_state) {
154 return NT_STATUS_NO_MEMORY;
157 gensec_security->private_data = gensec_gssapi_state;
159 gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
161 /* TODO: Fill in channel bindings */
162 gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
164 gensec_gssapi_state->server_name = GSS_C_NO_NAME;
165 gensec_gssapi_state->client_name = GSS_C_NO_NAME;
167 gensec_gssapi_state->want_flags = 0;
169 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
170 gensec_gssapi_state->want_flags |= GSS_C_DELEG_POLICY_FLAG;
172 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
173 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
175 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
176 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
178 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
179 gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
181 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
182 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
185 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
186 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
188 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
189 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
191 if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
192 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
195 gensec_gssapi_state->got_flags = 0;
197 switch (gensec_security->ops->auth_type) {
198 case DCERPC_AUTH_TYPE_SPNEGO:
199 gensec_gssapi_state->gss_oid = gss_mech_spnego;
201 case DCERPC_AUTH_TYPE_KRB5:
203 gensec_gssapi_state->gss_oid = gss_mech_krb5;
207 gensec_gssapi_state->session_key = data_blob(NULL, 0);
208 gensec_gssapi_state->pac = data_blob(NULL, 0);
210 ret = smb_krb5_init_context(gensec_gssapi_state,
212 gensec_security->settings->lp_ctx,
213 &gensec_gssapi_state->smb_krb5_context);
215 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
216 error_message(ret)));
217 talloc_free(gensec_gssapi_state);
218 return NT_STATUS_INTERNAL_ERROR;
221 gensec_gssapi_state->client_cred = NULL;
222 gensec_gssapi_state->server_cred = NULL;
224 gensec_gssapi_state->lucid = NULL;
226 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
228 gensec_gssapi_state->sasl = false;
229 gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
230 gensec_gssapi_state->sasl_protection = 0;
232 gensec_gssapi_state->max_wrap_buf_size
233 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
234 gensec_gssapi_state->gss_exchange_count = 0;
235 gensec_gssapi_state->sig_size = 0;
237 talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
239 realm = lpcfg_realm(gensec_security->settings->lp_ctx);
241 ret = gsskrb5_set_default_realm(realm);
243 DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
244 talloc_free(gensec_gssapi_state);
245 return NT_STATUS_INTERNAL_ERROR;
249 /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
250 ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
252 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
253 talloc_free(gensec_gssapi_state);
254 return NT_STATUS_INTERNAL_ERROR;
260 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
264 struct gensec_gssapi_state *gensec_gssapi_state;
265 struct cli_credentials *machine_account;
266 struct gssapi_creds_container *gcc;
268 nt_status = gensec_gssapi_start(gensec_security);
269 if (!NT_STATUS_IS_OK(nt_status)) {
273 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
275 machine_account = gensec_get_credentials(gensec_security);
277 if (!machine_account) {
278 DEBUG(3, ("No machine account credentials specified\n"));
279 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
281 ret = cli_credentials_get_server_gss_creds(machine_account,
282 gensec_security->settings->lp_ctx, &gcc);
284 DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
285 error_message(ret)));
286 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
290 gensec_gssapi_state->server_cred = gcc;
295 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
298 struct gensec_gssapi_state *gensec_gssapi_state;
299 nt_status = gensec_gssapi_server_start(gensec_security);
301 if (NT_STATUS_IS_OK(nt_status)) {
302 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
303 gensec_gssapi_state->sasl = true;
308 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
310 struct gensec_gssapi_state *gensec_gssapi_state;
311 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
314 gss_buffer_desc name_token;
316 OM_uint32 maj_stat, min_stat;
317 const char *hostname = gensec_get_target_hostname(gensec_security);
318 struct gssapi_creds_container *gcc;
319 const char *error_string;
322 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
323 return NT_STATUS_INVALID_PARAMETER;
325 if (is_ipaddress(hostname)) {
326 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
327 return NT_STATUS_INVALID_PARAMETER;
329 if (strcmp(hostname, "localhost") == 0) {
330 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
331 return NT_STATUS_INVALID_PARAMETER;
334 nt_status = gensec_gssapi_start(gensec_security);
335 if (!NT_STATUS_IS_OK(nt_status)) {
339 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
341 gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
342 if (gensec_gssapi_state->target_principal) {
343 name_type = GSS_C_NULL_OID;
345 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
346 gensec_get_target_service(gensec_security),
347 hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
349 name_type = GSS_C_NT_USER_NAME;
351 name_token.value = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
352 name_token.length = strlen(gensec_gssapi_state->target_principal);
355 maj_stat = gss_import_name (&min_stat,
358 &gensec_gssapi_state->server_name);
360 DEBUG(2, ("GSS Import name of %s failed: %s\n",
361 (char *)name_token.value,
362 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
363 return NT_STATUS_INVALID_PARAMETER;
366 ret = cli_credentials_get_client_gss_creds(creds,
367 gensec_security->event_ctx,
368 gensec_security->settings->lp_ctx, &gcc, &error_string);
372 case KRB5KDC_ERR_PREAUTH_FAILED:
373 case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
374 DEBUG(1, ("Wrong username or password: %s\n", error_string));
375 return NT_STATUS_LOGON_FAILURE;
376 case KRB5_KDC_UNREACH:
377 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
378 return NT_STATUS_NO_LOGON_SERVERS;
379 case KRB5_CC_NOTFOUND:
381 DEBUG(2, ("Error obtaining ticket we require to contact %s: (possibly due to clock skew between us and the KDC) %s\n", gensec_gssapi_state->target_principal, error_string));
382 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
384 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
385 return NT_STATUS_UNSUCCESSFUL;
388 gensec_gssapi_state->client_cred = gcc;
389 if (!talloc_reference(gensec_gssapi_state, gcc)) {
390 return NT_STATUS_NO_MEMORY;
396 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
399 struct gensec_gssapi_state *gensec_gssapi_state;
400 nt_status = gensec_gssapi_client_start(gensec_security);
402 if (NT_STATUS_IS_OK(nt_status)) {
403 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
404 gensec_gssapi_state->sasl = true;
411 * Check if the packet is one for this mechansim
413 * @param gensec_security GENSEC state
414 * @param in The request, as a DATA_BLOB
415 * @return Error, INVALID_PARAMETER if it's not a packet for us
416 * or NT_STATUS_OK if the packet is ok.
419 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
422 if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
425 return NT_STATUS_INVALID_PARAMETER;
431 * Next state function for the GSSAPI GENSEC mechanism
433 * @param gensec_gssapi_state GSSAPI State
434 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
435 * @param in The request, as a DATA_BLOB
436 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
437 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
438 * or NT_STATUS_OK if the user is authenticated.
441 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
442 TALLOC_CTX *out_mem_ctx,
443 const DATA_BLOB in, DATA_BLOB *out)
445 struct gensec_gssapi_state *gensec_gssapi_state
446 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
447 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
448 OM_uint32 maj_stat, min_stat;
450 gss_buffer_desc input_token, output_token;
451 gss_OID gss_oid_p = NULL;
452 input_token.length = in.length;
453 input_token.value = in.data;
455 switch (gensec_gssapi_state->sasl_state) {
458 switch (gensec_security->gensec_role) {
461 struct gsskrb5_send_to_kdc send_to_kdc;
463 send_to_kdc.func = smb_krb5_send_and_recv_func;
464 send_to_kdc.ptr = gensec_security->event_ctx;
466 min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
468 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
469 return NT_STATUS_INTERNAL_ERROR;
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;
489 send_to_kdc.func = smb_krb5_send_and_recv_func;
490 send_to_kdc.ptr = NULL;
492 ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
494 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
495 return NT_STATUS_INTERNAL_ERROR;
502 maj_stat = gss_accept_sec_context(&min_stat,
503 &gensec_gssapi_state->gssapi_context,
504 gensec_gssapi_state->server_cred->creds,
506 gensec_gssapi_state->input_chan_bindings,
507 &gensec_gssapi_state->client_name,
510 &gensec_gssapi_state->got_flags,
512 &gensec_gssapi_state->delegated_cred_handle);
514 gensec_gssapi_state->gss_oid = gss_oid_p;
519 return NT_STATUS_INVALID_PARAMETER;
523 gensec_gssapi_state->gss_exchange_count++;
525 if (maj_stat == GSS_S_COMPLETE) {
526 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
527 gss_release_buffer(&min_stat2, &output_token);
529 if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
530 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
532 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
535 /* We may have been invoked as SASL, so there
536 * is more work to do */
537 if (gensec_gssapi_state->sasl) {
538 /* Due to a very subtle interaction
539 * with SASL and the LDAP libs, we
540 * must ensure the data pointer is
541 * != NULL, but the length is 0.
543 * This ensures we send a 'zero
544 * length' (rather than NULL) response
548 out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
551 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
552 return NT_STATUS_MORE_PROCESSING_REQUIRED;
554 gensec_gssapi_state->sasl_state = STAGE_DONE;
556 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
557 DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
558 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
559 DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
561 DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
566 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
567 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
568 gss_release_buffer(&min_stat2, &output_token);
570 return NT_STATUS_MORE_PROCESSING_REQUIRED;
571 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
573 case KRB5KRB_AP_ERR_TKT_NYV:
574 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
575 gensec_gssapi_state->target_principal,
576 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
577 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
578 case KRB5KRB_AP_ERR_TKT_EXPIRED:
579 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
580 gensec_gssapi_state->target_principal,
581 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
582 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
583 case KRB5_KDC_UNREACH:
584 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
585 gensec_gssapi_state->target_principal,
586 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
587 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
588 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
589 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
590 gensec_gssapi_state->target_principal,
591 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
592 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
593 case KRB5KRB_AP_ERR_MSG_TYPE:
594 /* garbage input, possibly from the auto-mech detection */
595 return NT_STATUS_INVALID_PARAMETER;
597 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
598 gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
599 gensec_gssapi_state->gss_exchange_count,
600 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
604 DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
605 gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
606 gensec_gssapi_state->gss_exchange_count,
607 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
613 /* These last two stages are only done if we were invoked as SASL */
614 case STAGE_SASL_SSF_NEG:
616 switch (gensec_security->gensec_role) {
619 uint8_t maxlength_proposed[4];
620 uint8_t maxlength_accepted[4];
621 uint8_t security_supported;
624 input_token.length = in.length;
625 input_token.value = in.data;
627 /* As a client, we have just send a
628 * zero-length blob to the server (after the
629 * normal GSSAPI exchange), and it has replied
630 * with it's SASL negotiation */
632 maj_stat = gss_unwrap(&min_stat,
633 gensec_gssapi_state->gssapi_context,
638 if (GSS_ERROR(maj_stat)) {
639 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
640 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
641 return NT_STATUS_ACCESS_DENIED;
644 if (output_token.length < 4) {
645 return NT_STATUS_INVALID_PARAMETER;
648 memcpy(maxlength_proposed, output_token.value, 4);
649 gss_release_buffer(&min_stat, &output_token);
651 /* first byte is the proposed security */
652 security_supported = maxlength_proposed[0];
653 maxlength_proposed[0] = '\0';
655 /* Rest is the proposed max wrap length */
656 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
657 gensec_gssapi_state->max_wrap_buf_size);
658 gensec_gssapi_state->sasl_protection = 0;
659 if (security_supported & NEG_SEAL) {
660 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
661 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
664 if (security_supported & NEG_SIGN) {
665 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
666 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
669 if (security_supported & NEG_NONE) {
670 gensec_gssapi_state->sasl_protection |= NEG_NONE;
672 if (gensec_gssapi_state->sasl_protection == 0) {
673 DEBUG(1, ("Remote server does not support unprotected connections\n"));
674 return NT_STATUS_ACCESS_DENIED;
677 /* Send back the negotiated max length */
679 RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
681 maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
683 input_token.value = maxlength_accepted;
684 input_token.length = sizeof(maxlength_accepted);
686 maj_stat = gss_wrap(&min_stat,
687 gensec_gssapi_state->gssapi_context,
693 if (GSS_ERROR(maj_stat)) {
694 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
695 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
696 return NT_STATUS_ACCESS_DENIED;
699 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
700 gss_release_buffer(&min_stat, &output_token);
702 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
703 gensec_gssapi_state->sasl_state = STAGE_DONE;
705 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
706 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
707 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
708 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
710 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
717 uint8_t maxlength_proposed[4];
718 uint8_t security_supported = 0x0;
721 /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
722 if (in.length != 0) {
723 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
726 /* Give the client some idea what we will support */
728 RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
729 /* first byte is the proposed security */
730 maxlength_proposed[0] = '\0';
732 gensec_gssapi_state->sasl_protection = 0;
733 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
734 security_supported |= NEG_SEAL;
736 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
737 security_supported |= NEG_SIGN;
739 if (security_supported == 0) {
740 /* If we don't support anything, this must be 0 */
741 RSIVAL(maxlength_proposed, 0, 0x0);
744 /* TODO: We may not wish to support this */
745 security_supported |= NEG_NONE;
746 maxlength_proposed[0] = security_supported;
748 input_token.value = maxlength_proposed;
749 input_token.length = sizeof(maxlength_proposed);
751 maj_stat = gss_wrap(&min_stat,
752 gensec_gssapi_state->gssapi_context,
758 if (GSS_ERROR(maj_stat)) {
759 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
760 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
761 return NT_STATUS_ACCESS_DENIED;
764 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
765 gss_release_buffer(&min_stat, &output_token);
767 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
768 return NT_STATUS_MORE_PROCESSING_REQUIRED;
771 return NT_STATUS_INVALID_PARAMETER;
775 /* This is s server-only stage */
776 case STAGE_SASL_SSF_ACCEPT:
778 uint8_t maxlength_accepted[4];
779 uint8_t security_accepted;
782 input_token.length = in.length;
783 input_token.value = in.data;
785 maj_stat = gss_unwrap(&min_stat,
786 gensec_gssapi_state->gssapi_context,
791 if (GSS_ERROR(maj_stat)) {
792 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
793 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
794 return NT_STATUS_ACCESS_DENIED;
797 if (output_token.length < 4) {
798 return NT_STATUS_INVALID_PARAMETER;
801 memcpy(maxlength_accepted, output_token.value, 4);
802 gss_release_buffer(&min_stat, &output_token);
804 /* first byte is the proposed security */
805 security_accepted = maxlength_accepted[0];
806 maxlength_accepted[0] = '\0';
808 /* Rest is the proposed max wrap length */
809 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
810 gensec_gssapi_state->max_wrap_buf_size);
812 gensec_gssapi_state->sasl_protection = 0;
813 if (security_accepted & NEG_SEAL) {
814 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
815 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
816 return NT_STATUS_ACCESS_DENIED;
818 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
820 if (security_accepted & NEG_SIGN) {
821 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
822 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
823 return NT_STATUS_ACCESS_DENIED;
825 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
827 if (security_accepted & NEG_NONE) {
828 gensec_gssapi_state->sasl_protection |= NEG_NONE;
831 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
832 gensec_gssapi_state->sasl_state = STAGE_DONE;
833 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
834 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
835 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
836 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
838 DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
841 *out = data_blob(NULL, 0);
845 return NT_STATUS_INVALID_PARAMETER;
849 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
854 struct gensec_gssapi_state *gensec_gssapi_state
855 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
856 OM_uint32 maj_stat, min_stat;
857 gss_buffer_desc input_token, output_token;
859 input_token.length = in->length;
860 input_token.value = in->data;
862 maj_stat = gss_wrap(&min_stat,
863 gensec_gssapi_state->gssapi_context,
864 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
869 if (GSS_ERROR(maj_stat)) {
870 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
871 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
872 return NT_STATUS_ACCESS_DENIED;
875 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
876 gss_release_buffer(&min_stat, &output_token);
878 if (gensec_gssapi_state->sasl) {
879 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
880 if (max_wrapped_size < out->length) {
881 DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
882 (unsigned)in->length,
883 (unsigned)out->length,
884 (unsigned int)max_wrapped_size));
885 return NT_STATUS_INVALID_PARAMETER;
889 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
891 return NT_STATUS_ACCESS_DENIED;
896 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
901 struct gensec_gssapi_state *gensec_gssapi_state
902 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
903 OM_uint32 maj_stat, min_stat;
904 gss_buffer_desc input_token, output_token;
907 input_token.length = in->length;
908 input_token.value = in->data;
910 if (gensec_gssapi_state->sasl) {
911 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
912 if (max_wrapped_size < in->length) {
913 DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
914 return NT_STATUS_INVALID_PARAMETER;
918 maj_stat = gss_unwrap(&min_stat,
919 gensec_gssapi_state->gssapi_context,
924 if (GSS_ERROR(maj_stat)) {
925 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
926 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
927 return NT_STATUS_ACCESS_DENIED;
930 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
931 gss_release_buffer(&min_stat, &output_token);
933 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
935 return NT_STATUS_ACCESS_DENIED;
940 /* Find out the maximum input size negotiated on this connection */
942 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
944 struct gensec_gssapi_state *gensec_gssapi_state
945 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
946 OM_uint32 maj_stat, min_stat;
947 OM_uint32 max_input_size;
949 maj_stat = gss_wrap_size_limit(&min_stat,
950 gensec_gssapi_state->gssapi_context,
951 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
953 gensec_gssapi_state->max_wrap_buf_size,
955 if (GSS_ERROR(maj_stat)) {
956 TALLOC_CTX *mem_ctx = talloc_new(NULL);
957 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
958 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
959 talloc_free(mem_ctx);
963 return max_input_size;
966 /* Find out the maximum output size negotiated on this connection */
967 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
969 struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
970 return gensec_gssapi_state->max_wrap_buf_size;
973 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
975 uint8_t *data, size_t length,
976 const uint8_t *whole_pdu, size_t pdu_length,
979 struct gensec_gssapi_state *gensec_gssapi_state
980 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
981 OM_uint32 maj_stat, min_stat;
982 gss_buffer_desc input_token, output_token;
986 input_token.length = length;
987 input_token.value = data;
989 maj_stat = gss_wrap(&min_stat,
990 gensec_gssapi_state->gssapi_context,
991 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
996 if (GSS_ERROR(maj_stat)) {
997 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
998 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
999 return NT_STATUS_ACCESS_DENIED;
1002 if (output_token.length < input_token.length) {
1003 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1004 (long)output_token.length, (long)length));
1005 return NT_STATUS_INTERNAL_ERROR;
1007 sig_length = output_token.length - input_token.length;
1009 memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1010 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1012 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1013 dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1014 dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1016 gss_release_buffer(&min_stat, &output_token);
1018 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1020 return NT_STATUS_ACCESS_DENIED;
1022 return NT_STATUS_OK;
1025 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1026 TALLOC_CTX *mem_ctx,
1027 uint8_t *data, size_t length,
1028 const uint8_t *whole_pdu, size_t pdu_length,
1029 const DATA_BLOB *sig)
1031 struct gensec_gssapi_state *gensec_gssapi_state
1032 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1033 OM_uint32 maj_stat, min_stat;
1034 gss_buffer_desc input_token, output_token;
1036 gss_qop_t qop_state;
1039 dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1041 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1043 memcpy(in.data, sig->data, sig->length);
1044 memcpy(in.data + sig->length, data, length);
1046 input_token.length = in.length;
1047 input_token.value = in.data;
1049 maj_stat = gss_unwrap(&min_stat,
1050 gensec_gssapi_state->gssapi_context,
1055 if (GSS_ERROR(maj_stat)) {
1056 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1057 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1058 return NT_STATUS_ACCESS_DENIED;
1061 if (output_token.length != length) {
1062 return NT_STATUS_INTERNAL_ERROR;
1065 memcpy(data, output_token.value, length);
1067 gss_release_buffer(&min_stat, &output_token);
1069 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1071 return NT_STATUS_ACCESS_DENIED;
1073 return NT_STATUS_OK;
1076 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1077 TALLOC_CTX *mem_ctx,
1078 const uint8_t *data, size_t length,
1079 const uint8_t *whole_pdu, size_t pdu_length,
1082 struct gensec_gssapi_state *gensec_gssapi_state
1083 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1084 OM_uint32 maj_stat, min_stat;
1085 gss_buffer_desc input_token, output_token;
1087 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1088 input_token.length = pdu_length;
1089 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1091 input_token.length = length;
1092 input_token.value = discard_const_p(uint8_t *, data);
1095 maj_stat = gss_get_mic(&min_stat,
1096 gensec_gssapi_state->gssapi_context,
1100 if (GSS_ERROR(maj_stat)) {
1101 DEBUG(1, ("GSS GetMic failed: %s\n",
1102 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1103 return NT_STATUS_ACCESS_DENIED;
1106 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1108 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1110 gss_release_buffer(&min_stat, &output_token);
1112 return NT_STATUS_OK;
1115 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1116 TALLOC_CTX *mem_ctx,
1117 const uint8_t *data, size_t length,
1118 const uint8_t *whole_pdu, size_t pdu_length,
1119 const DATA_BLOB *sig)
1121 struct gensec_gssapi_state *gensec_gssapi_state
1122 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1123 OM_uint32 maj_stat, min_stat;
1124 gss_buffer_desc input_token;
1125 gss_buffer_desc input_message;
1126 gss_qop_t qop_state;
1128 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1130 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1131 input_message.length = pdu_length;
1132 input_message.value = discard_const(whole_pdu);
1134 input_message.length = length;
1135 input_message.value = discard_const(data);
1138 input_token.length = sig->length;
1139 input_token.value = sig->data;
1141 maj_stat = gss_verify_mic(&min_stat,
1142 gensec_gssapi_state->gssapi_context,
1146 if (GSS_ERROR(maj_stat)) {
1147 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1148 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1149 return NT_STATUS_ACCESS_DENIED;
1152 return NT_STATUS_OK;
1155 /* Try to figure out what features we actually got on the connection */
1156 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1159 struct gensec_gssapi_state *gensec_gssapi_state
1160 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1161 if (feature & GENSEC_FEATURE_SIGN) {
1162 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1163 if (gensec_gssapi_state->sasl
1164 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1165 return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1166 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1168 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1170 if (feature & GENSEC_FEATURE_SEAL) {
1171 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1172 if (gensec_gssapi_state->sasl
1173 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1174 return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1175 && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1177 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1179 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1180 /* Only for GSSAPI/Krb5 */
1181 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1185 if (feature & GENSEC_FEATURE_DCE_STYLE) {
1186 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1188 if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1191 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1195 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1198 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1202 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1203 if (!NT_STATUS_IS_OK(status)) {
1207 if (gensec_gssapi_state->lucid->protocol == 1) {
1213 /* We can always do async (rather than strict request/reply) packets. */
1214 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1221 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1222 * (for encrypting some passwords).
1224 * This breaks all the abstractions, but what do you expect...
1226 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1227 DATA_BLOB *session_key)
1229 struct gensec_gssapi_state *gensec_gssapi_state
1230 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1231 OM_uint32 maj_stat, min_stat;
1232 krb5_keyblock *subkey;
1234 if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1235 return NT_STATUS_NO_USER_SESSION_KEY;
1238 if (gensec_gssapi_state->session_key.data) {
1239 *session_key = gensec_gssapi_state->session_key;
1240 return NT_STATUS_OK;
1243 maj_stat = gsskrb5_get_subkey(&min_stat,
1244 gensec_gssapi_state->gssapi_context,
1246 if (maj_stat != 0) {
1247 DEBUG(1, ("NO session key for this mech\n"));
1248 return NT_STATUS_NO_USER_SESSION_KEY;
1251 DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1252 (int)KRB5_KEY_LENGTH(subkey),
1253 (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1254 *session_key = data_blob_talloc(gensec_gssapi_state,
1255 KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1256 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1257 gensec_gssapi_state->session_key = *session_key;
1258 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1260 return NT_STATUS_OK;
1263 /* Get some basic (and authorization) information about the user on
1264 * this session. This uses either the PAC (if present) or a local
1265 * database lookup */
1266 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1267 struct auth_session_info **_session_info)
1270 TALLOC_CTX *mem_ctx;
1271 struct gensec_gssapi_state *gensec_gssapi_state
1272 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1273 struct auth_serversupplied_info *server_info = NULL;
1274 struct auth_session_info *session_info = NULL;
1275 OM_uint32 maj_stat, min_stat;
1276 gss_buffer_desc pac;
1279 if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1280 || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1281 gensec_gssapi_state->gss_oid->length) != 0)) {
1282 DEBUG(1, ("NO session info available for this mech\n"));
1283 return NT_STATUS_INVALID_PARAMETER;
1286 mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1287 NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1289 maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1290 gensec_gssapi_state->gssapi_context,
1291 KRB5_AUTHDATA_WIN2K_PAC,
1295 if (maj_stat == 0) {
1296 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1297 gss_release_buffer(&min_stat, &pac);
1300 pac_blob = data_blob(NULL, 0);
1303 /* IF we have the PAC - otherwise we need to get this
1304 * data from elsewere - local ldb, or (TODO) lookup of some
1307 if (pac_blob.length) {
1308 nt_status = kerberos_pac_blob_to_server_info(mem_ctx,
1310 gensec_gssapi_state->smb_krb5_context->krb5_context,
1312 if (!NT_STATUS_IS_OK(nt_status)) {
1313 talloc_free(mem_ctx);
1317 gss_buffer_desc name_token;
1318 char *principal_string;
1320 maj_stat = gss_display_name (&min_stat,
1321 gensec_gssapi_state->client_name,
1324 if (GSS_ERROR(maj_stat)) {
1325 DEBUG(1, ("GSS display_name failed: %s\n",
1326 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1327 talloc_free(mem_ctx);
1328 return NT_STATUS_FOOBAR;
1331 principal_string = talloc_strndup(mem_ctx,
1332 (const char *)name_token.value,
1335 gss_release_buffer(&min_stat, &name_token);
1337 if (!principal_string) {
1338 talloc_free(mem_ctx);
1339 return NT_STATUS_NO_MEMORY;
1342 if (gensec_security->auth_context &&
1343 !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1344 DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1345 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1346 nt_status = gensec_security->auth_context->get_server_info_principal(mem_ctx,
1347 gensec_security->auth_context,
1352 if (!NT_STATUS_IS_OK(nt_status)) {
1353 talloc_free(mem_ctx);
1357 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1359 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1360 return NT_STATUS_ACCESS_DENIED;
1364 /* references the server_info into the session_info */
1365 nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1366 server_info, &session_info);
1367 if (!NT_STATUS_IS_OK(nt_status)) {
1368 talloc_free(mem_ctx);
1372 nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1373 if (!NT_STATUS_IS_OK(nt_status)) {
1374 talloc_free(mem_ctx);
1378 if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1379 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1381 krb5_error_code ret;
1382 const char *error_string;
1384 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1385 session_info->credentials = cli_credentials_init(session_info);
1386 if (!session_info->credentials) {
1387 talloc_free(mem_ctx);
1388 return NT_STATUS_NO_MEMORY;
1391 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1392 /* Just so we don't segfault trying to get at a username */
1393 cli_credentials_set_anonymous(session_info->credentials);
1395 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1396 gensec_security->settings->lp_ctx,
1397 gensec_gssapi_state->delegated_cred_handle,
1398 CRED_SPECIFIED, &error_string);
1400 talloc_free(mem_ctx);
1401 DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1402 return NT_STATUS_NO_MEMORY;
1405 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1406 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1408 /* It has been taken from this place... */
1409 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1411 talloc_steal(gensec_gssapi_state, session_info);
1412 talloc_free(mem_ctx);
1413 *_session_info = session_info;
1415 return NT_STATUS_OK;
1418 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1420 struct gensec_gssapi_state *gensec_gssapi_state
1421 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1424 if (gensec_gssapi_state->sig_size) {
1425 return gensec_gssapi_state->sig_size;
1428 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1429 gensec_gssapi_state->sig_size = 45;
1431 gensec_gssapi_state->sig_size = 37;
1434 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1435 if (!NT_STATUS_IS_OK(status)) {
1436 return gensec_gssapi_state->sig_size;
1439 if (gensec_gssapi_state->lucid->protocol == 1) {
1440 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1442 * TODO: windows uses 76 here, but we don't know
1443 * gss_wrap works with aes keys yet
1445 gensec_gssapi_state->sig_size = 76;
1447 gensec_gssapi_state->sig_size = 28;
1449 } else if (gensec_gssapi_state->lucid->protocol == 0) {
1450 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1452 case KEYTYPE_ARCFOUR:
1453 case KEYTYPE_ARCFOUR_56:
1454 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1455 gensec_gssapi_state->sig_size = 45;
1457 gensec_gssapi_state->sig_size = 37;
1461 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1462 gensec_gssapi_state->sig_size = 57;
1464 gensec_gssapi_state->sig_size = 49;
1470 return gensec_gssapi_state->sig_size;
1473 static const char *gensec_gssapi_krb5_oids[] = {
1474 GENSEC_OID_KERBEROS5_OLD,
1475 GENSEC_OID_KERBEROS5,
1479 static const char *gensec_gssapi_spnego_oids[] = {
1484 /* As a server, this could in theory accept any GSSAPI mech */
1485 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1486 .name = "gssapi_spnego",
1487 .sasl_name = "GSS-SPNEGO",
1488 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1489 .oid = gensec_gssapi_spnego_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 .sign_packet = gensec_gssapi_sign_packet,
1497 .check_packet = gensec_gssapi_check_packet,
1498 .seal_packet = gensec_gssapi_seal_packet,
1499 .unseal_packet = gensec_gssapi_unseal_packet,
1500 .wrap = gensec_gssapi_wrap,
1501 .unwrap = gensec_gssapi_unwrap,
1502 .have_feature = gensec_gssapi_have_feature,
1505 .priority = GENSEC_GSSAPI
1508 /* As a server, this could in theory accept any GSSAPI mech */
1509 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1510 .name = "gssapi_krb5",
1511 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1512 .oid = gensec_gssapi_krb5_oids,
1513 .client_start = gensec_gssapi_client_start,
1514 .server_start = gensec_gssapi_server_start,
1515 .magic = gensec_gssapi_magic,
1516 .update = gensec_gssapi_update,
1517 .session_key = gensec_gssapi_session_key,
1518 .session_info = gensec_gssapi_session_info,
1519 .sig_size = gensec_gssapi_sig_size,
1520 .sign_packet = gensec_gssapi_sign_packet,
1521 .check_packet = gensec_gssapi_check_packet,
1522 .seal_packet = gensec_gssapi_seal_packet,
1523 .unseal_packet = gensec_gssapi_unseal_packet,
1524 .wrap = gensec_gssapi_wrap,
1525 .unwrap = gensec_gssapi_unwrap,
1526 .have_feature = gensec_gssapi_have_feature,
1529 .priority = GENSEC_GSSAPI
1532 /* As a server, this could in theory accept any GSSAPI mech */
1533 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1534 .name = "gssapi_krb5_sasl",
1535 .sasl_name = "GSSAPI",
1536 .client_start = gensec_gssapi_sasl_client_start,
1537 .server_start = gensec_gssapi_sasl_server_start,
1538 .update = gensec_gssapi_update,
1539 .session_key = gensec_gssapi_session_key,
1540 .session_info = gensec_gssapi_session_info,
1541 .max_input_size = gensec_gssapi_max_input_size,
1542 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1543 .wrap = gensec_gssapi_wrap,
1544 .unwrap = gensec_gssapi_unwrap,
1545 .have_feature = gensec_gssapi_have_feature,
1548 .priority = GENSEC_GSSAPI
1551 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1555 ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1556 if (!NT_STATUS_IS_OK(ret)) {
1557 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1558 gensec_gssapi_spnego_security_ops.name));
1562 ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1563 if (!NT_STATUS_IS_OK(ret)) {
1564 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1565 gensec_gssapi_krb5_security_ops.name));
1569 ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1570 if (!NT_STATUS_IS_OK(ret)) {
1571 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1572 gensec_gssapi_sasl_krb5_security_ops.name));