2 Unix SMB/CIFS implementation.
3 kerberos authorization data (PAC) utility library
4 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
5 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
6 Copyright (C) Andrew Tridgell 2001
7 Copyright (C) Luke Howard 2002-2003
8 Copyright (C) Stefan Metzmacher 2004-2005
9 Copyright (C) Guenther Deschner 2005,2007,2008
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.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include "librpc/gen_ndr/ndr_krb5pac.h"
30 /****************************************************************
31 ****************************************************************/
33 static krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
35 struct PAC_SIGNATURE_DATA *sig,
37 krb5_keyblock *keyblock)
41 krb5_keyusage usage = 0;
43 smb_krb5_checksum_from_pac_sig(&cksum, sig);
45 #ifdef HAVE_KRB5_KU_OTHER_CKSUM /* Heimdal */
46 usage = KRB5_KU_OTHER_CKSUM;
47 #elif defined(HAVE_KRB5_KEYUSAGE_APP_DATA_CKSUM) /* MIT */
48 usage = KRB5_KEYUSAGE_APP_DATA_CKSUM;
50 #error UNKNOWN_KRB5_KEYUSAGE
53 ret = smb_krb5_verify_checksum(context,
61 DEBUG(2,("check_pac_checksum: PAC Verification failed: %s (%d)\n",
62 error_message(ret), ret));
69 /****************************************************************
70 ****************************************************************/
72 NTSTATUS decode_pac_data(TALLOC_CTX *mem_ctx,
73 DATA_BLOB *pac_data_blob,
75 krb5_keyblock *service_keyblock,
76 krb5_const_principal client_principal,
78 struct PAC_DATA **pac_data_out)
81 enum ndr_err_code ndr_err;
83 DATA_BLOB modified_pac_blob;
85 NTTIME tgs_authtime_nttime;
86 krb5_principal client_principal_pac = NULL;
89 struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL;
90 struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL;
91 struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL;
92 struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL;
93 struct PAC_LOGON_NAME *logon_name = NULL;
94 struct PAC_LOGON_INFO *logon_info = NULL;
95 struct PAC_DATA *pac_data = NULL;
96 struct PAC_DATA_RAW *pac_data_raw = NULL;
98 DATA_BLOB *srv_sig_blob = NULL;
99 DATA_BLOB *kdc_sig_blob = NULL;
101 *pac_data_out = NULL;
103 pac_data = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA);
104 pac_data_raw = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA_RAW);
105 kdc_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
106 srv_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
107 if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
108 return NT_STATUS_NO_MEMORY;
111 ndr_err = ndr_pull_struct_blob(pac_data_blob, pac_data,
113 (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
114 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
115 status = ndr_map_error2ntstatus(ndr_err);
116 DEBUG(0,("can't parse the PAC: %s\n",
121 if (pac_data->num_buffers < 4) {
122 /* we need logon_ingo, service_key and kdc_key */
123 DEBUG(0,("less than 4 PAC buffers\n"));
124 return NT_STATUS_INVALID_PARAMETER;
127 ndr_err = ndr_pull_struct_blob(pac_data_blob, pac_data_raw,
129 (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW);
130 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
131 status = ndr_map_error2ntstatus(ndr_err);
132 DEBUG(0,("can't parse the PAC: %s\n",
137 if (pac_data_raw->num_buffers < 4) {
138 /* we need logon_ingo, service_key and kdc_key */
139 DEBUG(0,("less than 4 PAC buffers\n"));
140 return NT_STATUS_INVALID_PARAMETER;
143 if (pac_data->num_buffers != pac_data_raw->num_buffers) {
144 /* we need logon_ingo, service_key and kdc_key */
145 DEBUG(0,("misparse! PAC_DATA has %d buffers while PAC_DATA_RAW has %d\n",
146 pac_data->num_buffers, pac_data_raw->num_buffers));
147 return NT_STATUS_INVALID_PARAMETER;
150 for (i=0; i < pac_data->num_buffers; i++) {
151 if (pac_data->buffers[i].type != pac_data_raw->buffers[i].type) {
152 DEBUG(0,("misparse! PAC_DATA buffer %d has type %d while PAC_DATA_RAW has %d\n",
153 i, pac_data->buffers[i].type, pac_data->buffers[i].type));
154 return NT_STATUS_INVALID_PARAMETER;
156 switch (pac_data->buffers[i].type) {
157 case PAC_TYPE_LOGON_INFO:
158 if (!pac_data->buffers[i].info) {
161 logon_info = pac_data->buffers[i].info->logon_info.info;
163 case PAC_TYPE_SRV_CHECKSUM:
164 if (!pac_data->buffers[i].info) {
167 srv_sig_ptr = &pac_data->buffers[i].info->srv_cksum;
168 srv_sig_blob = &pac_data_raw->buffers[i].info->remaining;
170 case PAC_TYPE_KDC_CHECKSUM:
171 if (!pac_data->buffers[i].info) {
174 kdc_sig_ptr = &pac_data->buffers[i].info->kdc_cksum;
175 kdc_sig_blob = &pac_data_raw->buffers[i].info->remaining;
177 case PAC_TYPE_LOGON_NAME:
178 logon_name = &pac_data->buffers[i].info->logon_name;
186 DEBUG(0,("PAC no logon_info\n"));
187 return NT_STATUS_INVALID_PARAMETER;
191 DEBUG(0,("PAC no logon_name\n"));
192 return NT_STATUS_INVALID_PARAMETER;
195 if (!srv_sig_ptr || !srv_sig_blob) {
196 DEBUG(0,("PAC no srv_key\n"));
197 return NT_STATUS_INVALID_PARAMETER;
200 if (!kdc_sig_ptr || !kdc_sig_blob) {
201 DEBUG(0,("PAC no kdc_key\n"));
202 return NT_STATUS_INVALID_PARAMETER;
205 /* Find and zero out the signatures, as required by the signing algorithm */
207 /* We find the data blobs above, now we parse them to get at the exact portion we should zero */
208 ndr_err = ndr_pull_struct_blob(kdc_sig_blob, kdc_sig_wipe,
210 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
211 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
212 status = ndr_map_error2ntstatus(ndr_err);
213 DEBUG(0,("can't parse the KDC signature: %s\n",
218 ndr_err = ndr_pull_struct_blob(srv_sig_blob, srv_sig_wipe,
220 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
221 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
222 status = ndr_map_error2ntstatus(ndr_err);
223 DEBUG(0,("can't parse the SRV signature: %s\n",
228 /* Now zero the decoded structure */
229 memset(kdc_sig_wipe->signature.data, '\0', kdc_sig_wipe->signature.length);
230 memset(srv_sig_wipe->signature.data, '\0', srv_sig_wipe->signature.length);
232 /* and reencode, back into the same place it came from */
233 ndr_err = ndr_push_struct_blob(kdc_sig_blob, pac_data_raw,
235 (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
236 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
237 status = ndr_map_error2ntstatus(ndr_err);
238 DEBUG(0,("can't repack the KDC signature: %s\n",
242 ndr_err = ndr_push_struct_blob(srv_sig_blob, pac_data_raw,
244 (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
245 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
246 status = ndr_map_error2ntstatus(ndr_err);
247 DEBUG(0,("can't repack the SRV signature: %s\n",
252 /* push out the whole structure, but now with zero'ed signatures */
253 ndr_err = ndr_push_struct_blob(&modified_pac_blob, pac_data_raw,
255 (ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW);
256 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
257 status = ndr_map_error2ntstatus(ndr_err);
258 DEBUG(0,("can't repack the RAW PAC: %s\n",
263 /* verify by service_key */
264 ret = check_pac_checksum(mem_ctx,
265 modified_pac_blob, srv_sig_ptr,
269 DEBUG(1, ("PAC Decode: Failed to verify the service signature: %s\n",
270 error_message(ret)));
271 return NT_STATUS_ACCESS_DENIED;
274 /* Convert to NT time, so as not to loose accuracy in comparison */
275 unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
277 if (tgs_authtime_nttime != logon_name->logon_time) {
278 DEBUG(2, ("PAC Decode: Logon time mismatch between ticket and PAC!\n"));
279 DEBUG(2, ("PAC Decode: PAC: %s\n", nt_time_string(mem_ctx, logon_name->logon_time)));
280 DEBUG(2, ("PAC Decode: Ticket: %s\n", nt_time_string(mem_ctx, tgs_authtime_nttime)));
281 return NT_STATUS_ACCESS_DENIED;
284 ret = smb_krb5_parse_name_norealm(context, logon_name->account_name,
285 &client_principal_pac);
287 DEBUG(2, ("Could not parse name from incoming PAC: [%s]: %s\n",
288 logon_name->account_name,
289 error_message(ret)));
290 return NT_STATUS_INVALID_PARAMETER;
293 if (!smb_krb5_principal_compare_any_realm(context, client_principal, client_principal_pac)) {
294 DEBUG(2, ("Name in PAC [%s] does not match principal name in ticket\n",
295 logon_name->account_name));
296 krb5_free_principal(context, client_principal_pac);
297 return NT_STATUS_ACCESS_DENIED;
300 DEBUG(3,("Found account name from PAC: %s [%s]\n",
301 logon_info->info3.base.account_name.string,
302 logon_info->info3.base.full_name.string));
304 DEBUG(10,("Successfully validated Kerberos PAC\n"));
306 if (DEBUGLEVEL >= 10) {
308 s = NDR_PRINT_STRUCT_STRING(mem_ctx, PAC_DATA, pac_data);
310 DEBUGADD(10,("%s\n", s));
314 *pac_data_out = pac_data;
319 /****************************************************************
320 ****************************************************************/
322 struct PAC_LOGON_INFO *get_logon_info_from_pac(struct PAC_DATA *pac_data)
326 for (i=0; i < pac_data->num_buffers; i++) {
328 if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
332 return pac_data->buffers[i].info->logon_info.info;
338 static krb5_error_code smb_krb5_get_tkt_from_creds(krb5_creds *creds,
342 krb5_context context;
343 krb5_auth_context auth_context = NULL;
344 krb5_data inbuf, outbuf;
346 ret = krb5_init_context(&context);
351 ret = krb5_auth_con_init(context, &auth_context);
358 ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
359 &inbuf, creds, &outbuf);
364 *tkt = data_blob(outbuf.data, outbuf.length);
369 kerberos_free_data_contents(context, &outbuf);
371 krb5_auth_con_free(context, auth_context);
373 krb5_free_context(context);
378 /****************************************************************
379 ****************************************************************/
381 NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
386 time_t *renew_till_time,
387 const char *cache_name,
389 bool add_netbios_addr,
390 time_t renewable_time,
391 const char *impersonate_princ_s,
392 struct PAC_DATA **pac_ret)
395 NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
396 DATA_BLOB tkt, ap_rep, sesskey1, sesskey2;
397 struct PAC_DATA *pac_data = NULL;
398 char *client_princ_out = NULL;
399 const char *auth_princ = NULL;
400 const char *local_service = NULL;
401 const char *cc = "MEMORY:kerberos_return_pac";
402 krb5_creds *creds = NULL;
406 ZERO_STRUCT(sesskey1);
407 ZERO_STRUCT(sesskey2);
409 if (!name || !pass) {
410 return NT_STATUS_INVALID_PARAMETER;
417 if (!strchr_m(name, '@')) {
418 auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
423 NT_STATUS_HAVE_NO_MEMORY(auth_princ);
425 local_service = talloc_asprintf(mem_ctx, "%s$@%s",
426 global_myname(), lp_realm());
427 NT_STATUS_HAVE_NO_MEMORY(local_service);
429 ret = kerberos_kinit_password_ext(auth_princ,
440 DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
441 auth_princ, error_message(ret), ret));
442 /* status already set */
446 DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
448 DEBUGADD(10,("\tvalid until: %s (%d)\n",
449 http_timestring(talloc_tos(), *expire_time),
452 if (renew_till_time) {
453 DEBUGADD(10,("\trenewable till: %s (%d)\n",
454 http_timestring(talloc_tos(), *renew_till_time),
455 (int)*renew_till_time));
458 /* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
459 * in that case fallback to NTLM - gd */
461 if (expire_time && renew_till_time &&
462 (*expire_time == 0) && (*renew_till_time == 0)) {
463 return NT_STATUS_INVALID_LOGON_TYPE;
466 ret = smb_krb5_get_creds(local_service,
472 DEBUG(1,("failed to get credentials for %s: %s\n",
473 local_service, error_message(ret)));
474 status = krb5_to_nt_status(ret);
478 ret = smb_krb5_get_tkt_from_creds(creds, &tkt);
480 status = krb5_to_nt_status(ret);
485 ret = cli_krb5_get_ticket(local_service,
492 impersonate_princ_s);
494 DEBUG(1,("failed to get ticket for %s: %s\n",
495 local_service, error_message(ret)));
496 status = krb5_to_nt_status(ret);
500 status = ads_verify_ticket(mem_ctx,
509 if (!NT_STATUS_IS_OK(status)) {
510 DEBUG(1,("ads_verify_ticket failed: %s\n",
516 DEBUG(1,("no PAC\n"));
517 status = NT_STATUS_INVALID_PARAMETER;
524 if (cc != cache_name) {
528 data_blob_free(&tkt);
529 data_blob_free(&ap_rep);
530 data_blob_free(&sesskey1);
531 data_blob_free(&sesskey2);
533 TALLOC_FREE(client_princ_out);
538 /****************************************************************
539 ****************************************************************/
541 static NTSTATUS kerberos_return_pac_logon_info(TALLOC_CTX *mem_ctx,
546 time_t *renew_till_time,
547 const char *cache_name,
549 bool add_netbios_addr,
550 time_t renewable_time,
551 const char *impersonate_princ_s,
552 struct PAC_LOGON_INFO **logon_info)
555 struct PAC_DATA *pac_data = NULL;
556 struct PAC_LOGON_INFO *info = NULL;
558 status = kerberos_return_pac(mem_ctx,
570 if (!NT_STATUS_IS_OK(status)) {
575 DEBUG(3,("no pac\n"));
576 return NT_STATUS_INVALID_USER_BUFFER;
579 info = get_logon_info_from_pac(pac_data);
581 DEBUG(1,("no logon_info\n"));
582 return NT_STATUS_INVALID_USER_BUFFER;
590 /****************************************************************
591 ****************************************************************/
593 NTSTATUS kerberos_return_info3_from_pac(TALLOC_CTX *mem_ctx,
598 time_t *renew_till_time,
599 const char *cache_name,
601 bool add_netbios_addr,
602 time_t renewable_time,
603 const char *impersonate_princ_s,
604 struct netr_SamInfo3 **info3)
607 struct PAC_LOGON_INFO *logon_info = NULL;
609 status = kerberos_return_pac_logon_info(mem_ctx,
621 if (!NT_STATUS_IS_OK(status)) {
625 *info3 = &logon_info->info3;