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"
32 /****************************************************************
33 ****************************************************************/
35 static krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
37 struct PAC_SIGNATURE_DATA *sig,
39 krb5_keyblock *keyblock)
43 krb5_keyusage usage = 0;
45 smb_krb5_checksum_from_pac_sig(&cksum, sig);
47 #ifdef HAVE_KRB5_KU_OTHER_CKSUM /* Heimdal */
48 usage = KRB5_KU_OTHER_CKSUM;
49 #elif defined(HAVE_KRB5_KEYUSAGE_APP_DATA_CKSUM) /* MIT */
50 usage = KRB5_KEYUSAGE_APP_DATA_CKSUM;
52 #error UNKNOWN_KRB5_KEYUSAGE
55 ret = smb_krb5_verify_checksum(context,
63 DEBUG(2,("check_pac_checksum: PAC Verification failed: %s (%d)\n",
64 error_message(ret), ret));
71 /****************************************************************
72 ****************************************************************/
74 NTSTATUS decode_pac_data(TALLOC_CTX *mem_ctx,
75 DATA_BLOB *pac_data_blob,
77 krb5_keyblock *service_keyblock,
78 krb5_const_principal client_principal,
80 struct PAC_DATA **pac_data_out)
83 enum ndr_err_code ndr_err;
85 DATA_BLOB modified_pac_blob;
87 NTTIME tgs_authtime_nttime;
88 krb5_principal client_principal_pac = NULL;
91 struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL;
92 struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL;
93 struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL;
94 struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL;
95 struct PAC_LOGON_NAME *logon_name = NULL;
96 struct PAC_LOGON_INFO *logon_info = NULL;
97 struct PAC_DATA *pac_data = NULL;
98 struct PAC_DATA_RAW *pac_data_raw = NULL;
100 DATA_BLOB *srv_sig_blob = NULL;
101 DATA_BLOB *kdc_sig_blob = NULL;
105 *pac_data_out = NULL;
107 pac_data = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA);
108 pac_data_raw = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA_RAW);
109 kdc_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
110 srv_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
111 if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
112 return NT_STATUS_NO_MEMORY;
115 ndr_err = ndr_pull_struct_blob(pac_data_blob, pac_data,
117 (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
118 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
119 status = ndr_map_error2ntstatus(ndr_err);
120 DEBUG(0,("can't parse the PAC: %s\n",
125 if (pac_data->num_buffers < 4) {
126 /* we need logon_ingo, service_key and kdc_key */
127 DEBUG(0,("less than 4 PAC buffers\n"));
128 return NT_STATUS_INVALID_PARAMETER;
131 ndr_err = ndr_pull_struct_blob(pac_data_blob, pac_data_raw,
133 (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW);
134 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
135 status = ndr_map_error2ntstatus(ndr_err);
136 DEBUG(0,("can't parse the PAC: %s\n",
141 if (pac_data_raw->num_buffers < 4) {
142 /* we need logon_ingo, service_key and kdc_key */
143 DEBUG(0,("less than 4 PAC buffers\n"));
144 return NT_STATUS_INVALID_PARAMETER;
147 if (pac_data->num_buffers != pac_data_raw->num_buffers) {
148 /* we need logon_ingo, service_key and kdc_key */
149 DEBUG(0,("misparse! PAC_DATA has %d buffers while PAC_DATA_RAW has %d\n",
150 pac_data->num_buffers, pac_data_raw->num_buffers));
151 return NT_STATUS_INVALID_PARAMETER;
154 for (i=0; i < pac_data->num_buffers; i++) {
155 if (pac_data->buffers[i].type != pac_data_raw->buffers[i].type) {
156 DEBUG(0,("misparse! PAC_DATA buffer %d has type %d while PAC_DATA_RAW has %d\n",
157 i, pac_data->buffers[i].type, pac_data->buffers[i].type));
158 return NT_STATUS_INVALID_PARAMETER;
160 switch (pac_data->buffers[i].type) {
161 case PAC_TYPE_LOGON_INFO:
162 if (!pac_data->buffers[i].info) {
165 logon_info = pac_data->buffers[i].info->logon_info.info;
167 case PAC_TYPE_SRV_CHECKSUM:
168 if (!pac_data->buffers[i].info) {
171 srv_sig_ptr = &pac_data->buffers[i].info->srv_cksum;
172 srv_sig_blob = &pac_data_raw->buffers[i].info->remaining;
174 case PAC_TYPE_KDC_CHECKSUM:
175 if (!pac_data->buffers[i].info) {
178 kdc_sig_ptr = &pac_data->buffers[i].info->kdc_cksum;
179 kdc_sig_blob = &pac_data_raw->buffers[i].info->remaining;
181 case PAC_TYPE_LOGON_NAME:
182 logon_name = &pac_data->buffers[i].info->logon_name;
190 DEBUG(0,("PAC no logon_info\n"));
191 return NT_STATUS_INVALID_PARAMETER;
195 DEBUG(0,("PAC no logon_name\n"));
196 return NT_STATUS_INVALID_PARAMETER;
199 if (!srv_sig_ptr || !srv_sig_blob) {
200 DEBUG(0,("PAC no srv_key\n"));
201 return NT_STATUS_INVALID_PARAMETER;
204 if (!kdc_sig_ptr || !kdc_sig_blob) {
205 DEBUG(0,("PAC no kdc_key\n"));
206 return NT_STATUS_INVALID_PARAMETER;
209 /* Find and zero out the signatures, as required by the signing algorithm */
211 /* We find the data blobs above, now we parse them to get at the exact portion we should zero */
212 ndr_err = ndr_pull_struct_blob(kdc_sig_blob, kdc_sig_wipe,
214 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
215 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
216 status = ndr_map_error2ntstatus(ndr_err);
217 DEBUG(0,("can't parse the KDC signature: %s\n",
222 ndr_err = ndr_pull_struct_blob(srv_sig_blob, srv_sig_wipe,
224 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
225 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
226 status = ndr_map_error2ntstatus(ndr_err);
227 DEBUG(0,("can't parse the SRV signature: %s\n",
232 /* Now zero the decoded structure */
233 memset(kdc_sig_wipe->signature.data, '\0', kdc_sig_wipe->signature.length);
234 memset(srv_sig_wipe->signature.data, '\0', srv_sig_wipe->signature.length);
236 /* and reencode, back into the same place it came from */
237 ndr_err = ndr_push_struct_blob(kdc_sig_blob, pac_data_raw,
239 (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
240 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
241 status = ndr_map_error2ntstatus(ndr_err);
242 DEBUG(0,("can't repack the KDC signature: %s\n",
246 ndr_err = ndr_push_struct_blob(srv_sig_blob, pac_data_raw,
248 (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
249 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
250 status = ndr_map_error2ntstatus(ndr_err);
251 DEBUG(0,("can't repack the SRV signature: %s\n",
256 /* push out the whole structure, but now with zero'ed signatures */
257 ndr_err = ndr_push_struct_blob(&modified_pac_blob, pac_data_raw,
259 (ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW);
260 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
261 status = ndr_map_error2ntstatus(ndr_err);
262 DEBUG(0,("can't repack the RAW PAC: %s\n",
267 /* verify by service_key */
268 ret = check_pac_checksum(mem_ctx,
269 modified_pac_blob, srv_sig_ptr,
273 DEBUG(1, ("PAC Decode: Failed to verify the service signature: %s\n",
274 error_message(ret)));
275 return NT_STATUS_ACCESS_DENIED;
278 /* Convert to NT time, so as not to loose accuracy in comparison */
279 unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
281 if (tgs_authtime_nttime != logon_name->logon_time) {
282 DEBUG(2, ("PAC Decode: Logon time mismatch between ticket and PAC!\n"));
283 DEBUG(2, ("PAC Decode: PAC: %s\n", nt_time_string(mem_ctx, logon_name->logon_time)));
284 DEBUG(2, ("PAC Decode: Ticket: %s\n", nt_time_string(mem_ctx, tgs_authtime_nttime)));
285 return NT_STATUS_ACCESS_DENIED;
288 ret = smb_krb5_parse_name_norealm(context, logon_name->account_name,
289 &client_principal_pac);
291 DEBUG(2, ("Could not parse name from incoming PAC: [%s]: %s\n",
292 logon_name->account_name,
293 error_message(ret)));
294 return NT_STATUS_INVALID_PARAMETER;
297 bool_ret = smb_krb5_principal_compare_any_realm(
298 context, client_principal, client_principal_pac);
300 krb5_free_principal(context, client_principal_pac);
303 DEBUG(2, ("Name in PAC [%s] does not match principal name in ticket\n",
304 logon_name->account_name));
305 return NT_STATUS_ACCESS_DENIED;
308 DEBUG(3,("Found account name from PAC: %s [%s]\n",
309 logon_info->info3.base.account_name.string,
310 logon_info->info3.base.full_name.string));
312 DEBUG(10,("Successfully validated Kerberos PAC\n"));
314 if (DEBUGLEVEL >= 10) {
316 s = NDR_PRINT_STRUCT_STRING(mem_ctx, PAC_DATA, pac_data);
318 DEBUGADD(10,("%s\n", s));
322 *pac_data_out = pac_data;
327 /****************************************************************
328 Given a username, password and other details, return the
329 PAC_LOGON_INFO (the structure containing the important user
330 information such as groups).
331 ****************************************************************/
333 NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
338 time_t *renew_till_time,
339 const char *cache_name,
341 bool add_netbios_addr,
342 time_t renewable_time,
343 const char *impersonate_princ_s,
344 struct PAC_LOGON_INFO **logon_info)
347 NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
348 DATA_BLOB tkt, ap_rep, sesskey1, sesskey2;
349 char *client_princ_out = NULL;
350 const char *auth_princ = NULL;
351 const char *local_service = NULL;
352 const char *cc = "MEMORY:kerberos_return_pac";
356 ZERO_STRUCT(sesskey1);
357 ZERO_STRUCT(sesskey2);
359 if (!name || !pass) {
360 return NT_STATUS_INVALID_PARAMETER;
367 if (!strchr_m(name, '@')) {
368 auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
373 NT_STATUS_HAVE_NO_MEMORY(auth_princ);
375 local_service = talloc_asprintf(mem_ctx, "%s$@%s",
376 global_myname(), lp_realm());
377 NT_STATUS_HAVE_NO_MEMORY(local_service);
379 ret = kerberos_kinit_password_ext(auth_princ,
390 DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
391 auth_princ, error_message(ret), ret));
392 /* status already set */
396 DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
398 DEBUGADD(10,("\tvalid until: %s (%d)\n",
399 http_timestring(talloc_tos(), *expire_time),
402 if (renew_till_time) {
403 DEBUGADD(10,("\trenewable till: %s (%d)\n",
404 http_timestring(talloc_tos(), *renew_till_time),
405 (int)*renew_till_time));
408 /* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
409 * in that case fallback to NTLM - gd */
411 if (expire_time && renew_till_time &&
412 (*expire_time == 0) && (*renew_till_time == 0)) {
413 return NT_STATUS_INVALID_LOGON_TYPE;
416 ret = cli_krb5_get_ticket(local_service,
423 impersonate_princ_s);
425 DEBUG(1,("failed to get ticket for %s: %s\n",
426 local_service, error_message(ret)));
427 if (impersonate_princ_s) {
428 DEBUGADD(1,("tried S4U2SELF impersonation as: %s\n",
429 impersonate_princ_s));
431 status = krb5_to_nt_status(ret);
434 status = ads_verify_ticket(mem_ctx,
443 if (!NT_STATUS_IS_OK(status)) {
444 DEBUG(1,("ads_verify_ticket failed: %s\n",
450 DEBUG(1,("no PAC\n"));
451 status = NT_STATUS_INVALID_PARAMETER;
456 if (cc != cache_name) {
460 data_blob_free(&tkt);
461 data_blob_free(&ap_rep);
462 data_blob_free(&sesskey1);
463 data_blob_free(&sesskey2);
465 TALLOC_FREE(client_princ_out);