2 Unix SMB/CIFS implementation.
4 Create and parse the krb5 PAC
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005,2008
7 Copyright (C) Andrew Tridgell 2001
8 Copyright (C) Luke Howard 2002-2003
9 Copyright (C) Stefan Metzmacher 2004-2005
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program. If not, see <http://www.gnu.org/licenses/>.
27 #include "system/kerberos.h"
28 #include "auth/auth.h"
29 #include "auth/kerberos/kerberos.h"
30 #include "librpc/gen_ndr/ndr_krb5pac.h"
32 #include "auth/auth_sam_reply.h"
33 #include "auth/credentials/credentials.h"
34 #include "auth/kerberos/kerberos_util.h"
35 #include "auth/kerberos/pac_utils.h"
37 krb5_error_code kerberos_encode_pac(TALLOC_CTX *mem_ctx,
38 struct PAC_DATA *pac_data,
40 const krb5_keyblock *krbtgt_keyblock,
41 const krb5_keyblock *service_keyblock,
46 enum ndr_err_code ndr_err;
47 DATA_BLOB zero_blob = data_blob(NULL, 0);
48 DATA_BLOB tmp_blob = data_blob(NULL, 0);
49 struct PAC_SIGNATURE_DATA *kdc_checksum = NULL;
50 struct PAC_SIGNATURE_DATA *srv_checksum = NULL;
53 /* First, just get the keytypes filled in (and lengths right, eventually) */
54 for (i=0; i < pac_data->num_buffers; i++) {
55 if (pac_data->buffers[i].type != PAC_TYPE_KDC_CHECKSUM) {
58 kdc_checksum = &pac_data->buffers[i].info->kdc_cksum,
59 ret = smb_krb5_make_pac_checksum(mem_ctx,
64 &kdc_checksum->signature);
66 DEBUG(2, ("making krbtgt PAC checksum failed: %s\n",
67 smb_get_krb5_error_message(context, ret, mem_ctx)));
68 talloc_free(pac_data);
73 for (i=0; i < pac_data->num_buffers; i++) {
74 if (pac_data->buffers[i].type != PAC_TYPE_SRV_CHECKSUM) {
77 srv_checksum = &pac_data->buffers[i].info->srv_cksum;
78 ret = smb_krb5_make_pac_checksum(mem_ctx,
83 &srv_checksum->signature);
85 DEBUG(2, ("making service PAC checksum failed: %s\n",
86 smb_get_krb5_error_message(context, ret, mem_ctx)));
87 talloc_free(pac_data);
93 DEBUG(2, ("Invalid PAC constructed for signing, no KDC checksum present!\n"));
97 DEBUG(2, ("Invalid PAC constructed for signing, no SRV checksum present!\n"));
101 /* But wipe out the actual signatures */
102 memset(kdc_checksum->signature.data, '\0', kdc_checksum->signature.length);
103 memset(srv_checksum->signature.data, '\0', srv_checksum->signature.length);
105 ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
107 (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
108 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
109 nt_status = ndr_map_error2ntstatus(ndr_err);
110 DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
111 talloc_free(pac_data);
115 /* Then sign the result of the previous push, where the sig was zero'ed out */
116 ret = smb_krb5_make_pac_checksum(mem_ctx,
121 &srv_checksum->signature);
124 DBG_WARNING("making krbtgt PAC srv_checksum failed: %s\n",
125 smb_get_krb5_error_message(context, ret, mem_ctx));
126 talloc_free(pac_data);
130 /* Then sign Server checksum */
131 ret = smb_krb5_make_pac_checksum(mem_ctx,
132 &srv_checksum->signature,
136 &kdc_checksum->signature);
138 DBG_WARNING("making krbtgt PAC kdc_checksum failed: %s\n",
139 smb_get_krb5_error_message(context, ret, mem_ctx));
140 talloc_free(pac_data);
144 /* And push it out again, this time to the world. This relies on deterministic pointer values */
145 ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
147 (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
148 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
149 nt_status = ndr_map_error2ntstatus(ndr_err);
150 DEBUG(1, ("PAC (final) push failed: %s\n", nt_errstr(nt_status)));
151 talloc_free(pac_data);
161 krb5_error_code kerberos_create_pac(TALLOC_CTX *mem_ctx,
162 struct auth_user_info_dc *user_info_dc,
163 krb5_context context,
164 const krb5_keyblock *krbtgt_keyblock,
165 const krb5_keyblock *service_keyblock,
166 krb5_principal client_principal,
172 struct PAC_DATA *pac_data = talloc(mem_ctx, struct PAC_DATA);
173 struct netr_SamInfo3 *sam3;
174 union PAC_INFO *u_LOGON_INFO;
175 struct PAC_LOGON_INFO *LOGON_INFO;
176 union PAC_INFO *u_LOGON_NAME;
177 struct PAC_LOGON_NAME *LOGON_NAME;
178 union PAC_INFO *u_KDC_CHECKSUM;
179 union PAC_INFO *u_SRV_CHECKSUM;
184 PAC_BUF_LOGON_INFO = 0,
185 PAC_BUF_LOGON_NAME = 1,
186 PAC_BUF_SRV_CHECKSUM = 2,
187 PAC_BUF_KDC_CHECKSUM = 3,
188 PAC_BUF_NUM_BUFFERS = 4
195 pac_data->num_buffers = PAC_BUF_NUM_BUFFERS;
196 pac_data->version = 0;
198 pac_data->buffers = talloc_array(pac_data,
200 pac_data->num_buffers);
201 if (!pac_data->buffers) {
202 talloc_free(pac_data);
207 u_LOGON_INFO = talloc_zero(pac_data->buffers, union PAC_INFO);
209 talloc_free(pac_data);
212 pac_data->buffers[PAC_BUF_LOGON_INFO].type = PAC_TYPE_LOGON_INFO;
213 pac_data->buffers[PAC_BUF_LOGON_INFO].info = u_LOGON_INFO;
216 u_LOGON_NAME = talloc_zero(pac_data->buffers, union PAC_INFO);
218 talloc_free(pac_data);
221 pac_data->buffers[PAC_BUF_LOGON_NAME].type = PAC_TYPE_LOGON_NAME;
222 pac_data->buffers[PAC_BUF_LOGON_NAME].info = u_LOGON_NAME;
223 LOGON_NAME = &u_LOGON_NAME->logon_name;
226 u_SRV_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
227 if (!u_SRV_CHECKSUM) {
228 talloc_free(pac_data);
231 pac_data->buffers[PAC_BUF_SRV_CHECKSUM].type = PAC_TYPE_SRV_CHECKSUM;
232 pac_data->buffers[PAC_BUF_SRV_CHECKSUM].info = u_SRV_CHECKSUM;
235 u_KDC_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
236 if (!u_KDC_CHECKSUM) {
237 talloc_free(pac_data);
240 pac_data->buffers[PAC_BUF_KDC_CHECKSUM].type = PAC_TYPE_KDC_CHECKSUM;
241 pac_data->buffers[PAC_BUF_KDC_CHECKSUM].info = u_KDC_CHECKSUM;
243 /* now the real work begins... */
245 LOGON_INFO = talloc_zero(u_LOGON_INFO, struct PAC_LOGON_INFO);
247 talloc_free(pac_data);
250 nt_status = auth_convert_user_info_dc_saminfo3(LOGON_INFO, user_info_dc,
251 AUTH_INCLUDE_RESOURCE_GROUPS,
253 if (!NT_STATUS_IS_OK(nt_status)) {
254 DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
255 talloc_free(pac_data);
259 u_LOGON_INFO->logon_info.info = LOGON_INFO;
260 LOGON_INFO->info3 = *sam3;
262 ret = krb5_unparse_name_flags(context, client_principal,
263 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
264 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
269 LOGON_NAME->account_name = talloc_strdup(LOGON_NAME, name);
272 this logon_time field is absolutely critical. This is what
273 caused all our PAC troubles :-)
275 unix_to_nt_time(&LOGON_NAME->logon_time, tgs_authtime);
277 ret = kerberos_encode_pac(mem_ctx,
283 talloc_free(pac_data);
287 static krb5_error_code kerberos_pac_buffer_present(krb5_context context,
288 const krb5_const_pac pac,
291 #ifdef SAMBA4_USES_HEIMDAL
292 return krb5_pac_get_buffer(context, pac, type, NULL);
298 * MIT won't let us pass NULL for the data parameter, so we are forced
299 * to allocate a new buffer and then immediately free it.
301 ret = krb5_pac_get_buffer(context, pac, type, &data);
303 krb5_free_data_contents(context, &data);
306 #endif /* SAMBA4_USES_HEIMDAL */
309 krb5_error_code kerberos_pac_to_user_info_dc(TALLOC_CTX *mem_ctx,
311 krb5_context context,
312 struct auth_user_info_dc **user_info_dc,
313 const enum auth_group_inclusion group_inclusion,
314 struct PAC_SIGNATURE_DATA *pac_srv_sig,
315 struct PAC_SIGNATURE_DATA *pac_kdc_sig,
316 struct PAC_DOMAIN_GROUP_MEMBERSHIP **resource_groups)
319 enum ndr_err_code ndr_err;
322 DATA_BLOB pac_logon_info_in, pac_srv_checksum_in, pac_kdc_checksum_in;
323 krb5_data k5pac_logon_info_in, k5pac_srv_checksum_in, k5pac_kdc_checksum_in;
324 DATA_BLOB pac_upn_dns_info_in;
325 krb5_data k5pac_upn_dns_info_in;
328 union PAC_INFO _upn_dns_info;
329 struct PAC_UPN_DNS_INFO *upn_dns_info = NULL;
330 struct auth_user_info_dc *user_info_dc_out;
331 const struct PAC_DOMAIN_GROUP_MEMBERSHIP *resource_groups_in = NULL;
332 struct PAC_DOMAIN_GROUP_MEMBERSHIP *resource_groups_out = NULL;
334 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
341 talloc_free(tmp_ctx);
345 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_LOGON_INFO, &k5pac_logon_info_in);
347 talloc_free(tmp_ctx);
351 pac_logon_info_in = data_blob_const(k5pac_logon_info_in.data, k5pac_logon_info_in.length);
353 ndr_err = ndr_pull_union_blob(&pac_logon_info_in, tmp_ctx, &info,
355 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
356 smb_krb5_free_data_contents(context, &k5pac_logon_info_in);
357 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
358 nt_status = ndr_map_error2ntstatus(ndr_err);
359 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
360 talloc_free(tmp_ctx);
363 if (info.logon_info.info == NULL) {
364 DEBUG(0,("can't parse the PAC LOGON_INFO: missing info pointer\n"));
365 talloc_free(tmp_ctx);
369 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_UPN_DNS_INFO,
370 &k5pac_upn_dns_info_in);
372 ZERO_STRUCT(k5pac_upn_dns_info_in);
376 talloc_free(tmp_ctx);
380 pac_upn_dns_info_in = data_blob_const(k5pac_upn_dns_info_in.data,
381 k5pac_upn_dns_info_in.length);
383 if (pac_upn_dns_info_in.length != 0) {
384 ndr_err = ndr_pull_union_blob(&pac_upn_dns_info_in, tmp_ctx,
386 PAC_TYPE_UPN_DNS_INFO,
387 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
388 smb_krb5_free_data_contents(context, &k5pac_upn_dns_info_in);
389 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
390 nt_status = ndr_map_error2ntstatus(ndr_err);
391 DEBUG(0,("can't parse the PAC UPN_DNS_INFO: %s\n",
392 nt_errstr(nt_status)));
393 talloc_free(tmp_ctx);
396 upn_dns_info = &_upn_dns_info.upn_dns_info;
399 /* Pull this right into the normal auth system structures */
400 nt_status = make_user_info_dc_pac(tmp_ctx,
401 info.logon_info.info,
405 if (!NT_STATUS_IS_OK(nt_status)) {
406 DBG_ERR("make_user_info_dc_pac() failed - %s\n",
407 nt_errstr(nt_status));
408 NDR_PRINT_DEBUG(PAC_LOGON_INFO, info.logon_info.info);
409 if (upn_dns_info != NULL) {
410 NDR_PRINT_DEBUG(PAC_UPN_DNS_INFO, upn_dns_info);
412 talloc_free(tmp_ctx);
417 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_SRV_CHECKSUM, &k5pac_srv_checksum_in);
419 talloc_free(tmp_ctx);
423 pac_srv_checksum_in = data_blob_const(k5pac_srv_checksum_in.data, k5pac_srv_checksum_in.length);
425 ndr_err = ndr_pull_struct_blob(&pac_srv_checksum_in, pac_srv_sig,
427 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
428 smb_krb5_free_data_contents(context, &k5pac_srv_checksum_in);
429 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
430 nt_status = ndr_map_error2ntstatus(ndr_err);
431 DEBUG(0,("can't parse the server signature: %s\n",
432 nt_errstr(nt_status)));
438 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_KDC_CHECKSUM, &k5pac_kdc_checksum_in);
440 talloc_free(tmp_ctx);
444 pac_kdc_checksum_in = data_blob_const(k5pac_kdc_checksum_in.data, k5pac_kdc_checksum_in.length);
446 ndr_err = ndr_pull_struct_blob(&pac_kdc_checksum_in, pac_kdc_sig,
448 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
449 smb_krb5_free_data_contents(context, &k5pac_kdc_checksum_in);
450 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
451 nt_status = ndr_map_error2ntstatus(ndr_err);
452 DEBUG(0,("can't parse the KDC signature: %s\n",
453 nt_errstr(nt_status)));
459 * Based on the presence of a REQUESTER_SID PAC buffer, ascertain
460 * whether the ticket is a TGT. This helps the KDC and kpasswd service
461 * ensure they do not accept tickets meant for the other.
463 * This heuristic will fail for older Samba versions and Windows prior
464 * to Nov. 2021 updates, which lack support for the REQUESTER_SID PAC
467 ret = kerberos_pac_buffer_present(context, pac, PAC_TYPE_REQUESTER_SID);
469 /* This probably isn't a TGT. */
470 user_info_dc_out->ticket_type = TICKET_TYPE_NON_TGT;
471 } else if (ret != 0) {
472 talloc_free(tmp_ctx);
475 /* This probably is a TGT. */
476 user_info_dc_out->ticket_type = TICKET_TYPE_TGT;
480 * If we have resource groups and the caller wants them returned, we
483 resource_groups_in = &info.logon_info.info->resource_groups;
484 if (resource_groups != NULL && resource_groups_in->groups.count != 0) {
485 resource_groups_out = talloc(tmp_ctx, struct PAC_DOMAIN_GROUP_MEMBERSHIP);
486 if (resource_groups_out == NULL) {
487 talloc_free(tmp_ctx);
491 *resource_groups_out = (struct PAC_DOMAIN_GROUP_MEMBERSHIP) {
492 .domain_sid = talloc_steal(resource_groups_out, resource_groups_in->domain_sid),
494 .count = resource_groups_in->groups.count,
495 .rids = talloc_steal(resource_groups_out, resource_groups_in->groups.rids),
500 *user_info_dc = talloc_steal(mem_ctx, user_info_dc_out);
501 if (resource_groups_out != NULL) {
502 *resource_groups = talloc_steal(mem_ctx, resource_groups_out);
509 NTSTATUS kerberos_pac_blob_to_user_info_dc(TALLOC_CTX *mem_ctx,
511 krb5_context context,
512 struct auth_user_info_dc **user_info_dc,
513 struct PAC_SIGNATURE_DATA *pac_srv_sig,
514 struct PAC_SIGNATURE_DATA *pac_kdc_sig)
518 ret = krb5_pac_parse(context,
519 pac_blob.data, pac_blob.length,
522 return map_nt_error_from_unix_common(ret);
526 ret = kerberos_pac_to_user_info_dc(mem_ctx,
530 AUTH_INCLUDE_RESOURCE_GROUPS,
534 krb5_pac_free(context, pac);
536 return map_nt_error_from_unix_common(ret);