source: trunk/server/source4/auth/kerberos/kerberos_pac.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 22.6 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 Create and parse the krb5 PAC
5
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
10
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.
15
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.
20
21
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/>.
24*/
25
26#include "includes.h"
27#include "system/kerberos.h"
28#include "auth/auth.h"
29#include "auth/kerberos/kerberos.h"
30#include "librpc/gen_ndr/ndr_krb5pac.h"
31#include <ldb.h>
32#include "auth/auth_sam_reply.h"
33
34krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
35 DATA_BLOB pac_data,
36 struct PAC_SIGNATURE_DATA *sig,
37 krb5_context context,
38 const krb5_keyblock *keyblock)
39{
40 krb5_error_code ret;
41 krb5_crypto crypto;
42 Checksum cksum;
43
44 cksum.cksumtype = (CKSUMTYPE)sig->type;
45 cksum.checksum.length = sig->signature.length;
46 cksum.checksum.data = sig->signature.data;
47
48 ret = krb5_crypto_init(context,
49 keyblock,
50 0,
51 &crypto);
52 if (ret) {
53 DEBUG(0,("krb5_crypto_init() failed: %s\n",
54 smb_get_krb5_error_message(context, ret, mem_ctx)));
55 return ret;
56 }
57 ret = krb5_verify_checksum(context,
58 crypto,
59 KRB5_KU_OTHER_CKSUM,
60 pac_data.data,
61 pac_data.length,
62 &cksum);
63 krb5_crypto_destroy(context, crypto);
64
65 return ret;
66}
67
68 NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx,
69 struct PAC_DATA **pac_data_out,
70 DATA_BLOB blob,
71 krb5_context context,
72 const krb5_keyblock *krbtgt_keyblock,
73 const krb5_keyblock *service_keyblock,
74 krb5_const_principal client_principal,
75 time_t tgs_authtime,
76 krb5_error_code *k5ret)
77{
78 krb5_error_code ret;
79 NTSTATUS status;
80 enum ndr_err_code ndr_err;
81 struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL;
82 struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL;
83 struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL;
84 struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL;
85 struct PAC_LOGON_INFO *logon_info = NULL;
86 struct PAC_LOGON_NAME *logon_name = NULL;
87 struct PAC_DATA *pac_data;
88 struct PAC_DATA_RAW *pac_data_raw;
89
90 DATA_BLOB *srv_sig_blob = NULL;
91 DATA_BLOB *kdc_sig_blob = NULL;
92
93 DATA_BLOB modified_pac_blob;
94 NTTIME tgs_authtime_nttime;
95 krb5_principal client_principal_pac;
96 uint32_t i;
97
98 krb5_clear_error_message(context);
99
100 if (k5ret) {
101 *k5ret = KRB5_PARSE_MALFORMED;
102 }
103
104 pac_data = talloc(mem_ctx, struct PAC_DATA);
105 pac_data_raw = talloc(mem_ctx, struct PAC_DATA_RAW);
106 kdc_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
107 srv_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
108 if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
109 if (k5ret) {
110 *k5ret = ENOMEM;
111 }
112 return NT_STATUS_NO_MEMORY;
113 }
114
115 ndr_err = ndr_pull_struct_blob(&blob, pac_data,
116 pac_data, (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
117 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
118 status = ndr_map_error2ntstatus(ndr_err);
119 DEBUG(0,("can't parse the PAC: %s\n",
120 nt_errstr(status)));
121 return status;
122 }
123
124 if (pac_data->num_buffers < 4) {
125 /* we need logon_ingo, service_key and kdc_key */
126 DEBUG(0,("less than 4 PAC buffers\n"));
127 return NT_STATUS_INVALID_PARAMETER;
128 }
129
130 ndr_err = ndr_pull_struct_blob(&blob, pac_data_raw,
131 pac_data_raw,
132 (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW);
133 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
134 status = ndr_map_error2ntstatus(ndr_err);
135 DEBUG(0,("can't parse the PAC: %s\n",
136 nt_errstr(status)));
137 return status;
138 }
139
140 if (pac_data_raw->num_buffers < 4) {
141 /* we need logon_ingo, service_key and kdc_key */
142 DEBUG(0,("less than 4 PAC buffers\n"));
143 return NT_STATUS_INVALID_PARAMETER;
144 }
145
146 if (pac_data->num_buffers != pac_data_raw->num_buffers) {
147 /* we need logon_ingo, service_key and kdc_key */
148 DEBUG(0,("misparse! PAC_DATA has %d buffers while PAC_DATA_RAW has %d\n",
149 pac_data->num_buffers, pac_data_raw->num_buffers));
150 return NT_STATUS_INVALID_PARAMETER;
151 }
152
153 for (i=0; i < pac_data->num_buffers; i++) {
154 if (pac_data->buffers[i].type != pac_data_raw->buffers[i].type) {
155 DEBUG(0,("misparse! PAC_DATA buffer %d has type %d while PAC_DATA_RAW has %d\n",
156 i, pac_data->buffers[i].type, pac_data->buffers[i].type));
157 return NT_STATUS_INVALID_PARAMETER;
158 }
159 switch (pac_data->buffers[i].type) {
160 case PAC_TYPE_LOGON_INFO:
161 if (!pac_data->buffers[i].info) {
162 break;
163 }
164 logon_info = pac_data->buffers[i].info->logon_info.info;
165 break;
166 case PAC_TYPE_SRV_CHECKSUM:
167 if (!pac_data->buffers[i].info) {
168 break;
169 }
170 srv_sig_ptr = &pac_data->buffers[i].info->srv_cksum;
171 srv_sig_blob = &pac_data_raw->buffers[i].info->remaining;
172 break;
173 case PAC_TYPE_KDC_CHECKSUM:
174 if (!pac_data->buffers[i].info) {
175 break;
176 }
177 kdc_sig_ptr = &pac_data->buffers[i].info->kdc_cksum;
178 kdc_sig_blob = &pac_data_raw->buffers[i].info->remaining;
179 break;
180 case PAC_TYPE_LOGON_NAME:
181 logon_name = &pac_data->buffers[i].info->logon_name;
182 break;
183 default:
184 break;
185 }
186 }
187
188 if (!logon_info) {
189 DEBUG(0,("PAC no logon_info\n"));
190 return NT_STATUS_INVALID_PARAMETER;
191 }
192
193 if (!logon_name) {
194 DEBUG(0,("PAC no logon_name\n"));
195 return NT_STATUS_INVALID_PARAMETER;
196 }
197
198 if (!srv_sig_ptr || !srv_sig_blob) {
199 DEBUG(0,("PAC no srv_key\n"));
200 return NT_STATUS_INVALID_PARAMETER;
201 }
202
203 if (!kdc_sig_ptr || !kdc_sig_blob) {
204 DEBUG(0,("PAC no kdc_key\n"));
205 return NT_STATUS_INVALID_PARAMETER;
206 }
207
208 /* Find and zero out the signatures, as required by the signing algorithm */
209
210 /* We find the data blobs above, now we parse them to get at the exact portion we should zero */
211 ndr_err = ndr_pull_struct_blob(kdc_sig_blob, kdc_sig_wipe,
212 kdc_sig_wipe,
213 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
214 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
215 status = ndr_map_error2ntstatus(ndr_err);
216 DEBUG(0,("can't parse the KDC signature: %s\n",
217 nt_errstr(status)));
218 return status;
219 }
220
221 ndr_err = ndr_pull_struct_blob(srv_sig_blob, srv_sig_wipe,
222 srv_sig_wipe,
223 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
224 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
225 status = ndr_map_error2ntstatus(ndr_err);
226 DEBUG(0,("can't parse the SRV signature: %s\n",
227 nt_errstr(status)));
228 return status;
229 }
230
231 /* Now zero the decoded structure */
232 memset(kdc_sig_wipe->signature.data, '\0', kdc_sig_wipe->signature.length);
233 memset(srv_sig_wipe->signature.data, '\0', srv_sig_wipe->signature.length);
234
235 /* and reencode, back into the same place it came from */
236 ndr_err = ndr_push_struct_blob(kdc_sig_blob, pac_data_raw,
237 kdc_sig_wipe,
238 (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
239 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
240 status = ndr_map_error2ntstatus(ndr_err);
241 DEBUG(0,("can't repack the KDC signature: %s\n",
242 nt_errstr(status)));
243 return status;
244 }
245 ndr_err = ndr_push_struct_blob(srv_sig_blob, pac_data_raw,
246 srv_sig_wipe,
247 (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
248 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
249 status = ndr_map_error2ntstatus(ndr_err);
250 DEBUG(0,("can't repack the SRV signature: %s\n",
251 nt_errstr(status)));
252 return status;
253 }
254
255 /* push out the whole structure, but now with zero'ed signatures */
256 ndr_err = ndr_push_struct_blob(&modified_pac_blob, pac_data_raw,
257 pac_data_raw,
258 (ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW);
259 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
260 status = ndr_map_error2ntstatus(ndr_err);
261 DEBUG(0,("can't repack the RAW PAC: %s\n",
262 nt_errstr(status)));
263 return status;
264 }
265
266 /* verify by service_key */
267 ret = check_pac_checksum(mem_ctx,
268 modified_pac_blob, srv_sig_ptr,
269 context,
270 service_keyblock);
271 if (ret) {
272 DEBUG(1, ("PAC Decode: Failed to verify the service signature: %s\n",
273 smb_get_krb5_error_message(context, ret, mem_ctx)));
274 if (k5ret) {
275 *k5ret = ret;
276 }
277 return NT_STATUS_ACCESS_DENIED;
278 }
279
280 if (krbtgt_keyblock) {
281 ret = check_pac_checksum(mem_ctx,
282 srv_sig_ptr->signature, kdc_sig_ptr,
283 context, krbtgt_keyblock);
284 if (ret) {
285 DEBUG(1, ("PAC Decode: Failed to verify the KDC signature: %s\n",
286 smb_get_krb5_error_message(context, ret, mem_ctx)));
287 if (k5ret) {
288 *k5ret = ret;
289 }
290 return NT_STATUS_ACCESS_DENIED;
291 }
292 }
293
294 /* Convert to NT time, so as not to loose accuracy in comparison */
295 unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
296
297 if (tgs_authtime_nttime != logon_name->logon_time) {
298 DEBUG(2, ("PAC Decode: Logon time mismatch between ticket and PAC!\n"));
299 DEBUG(2, ("PAC Decode: PAC: %s\n", nt_time_string(mem_ctx, logon_name->logon_time)));
300 DEBUG(2, ("PAC Decode: Ticket: %s\n", nt_time_string(mem_ctx, tgs_authtime_nttime)));
301 return NT_STATUS_ACCESS_DENIED;
302 }
303
304 ret = krb5_parse_name_flags(context, logon_name->account_name, KRB5_PRINCIPAL_PARSE_NO_REALM,
305 &client_principal_pac);
306 if (ret) {
307 DEBUG(2, ("Could not parse name from incoming PAC: [%s]: %s\n",
308 logon_name->account_name,
309 smb_get_krb5_error_message(context, ret, mem_ctx)));
310 if (k5ret) {
311 *k5ret = ret;
312 }
313 return NT_STATUS_INVALID_PARAMETER;
314 }
315
316 if (!krb5_principal_compare_any_realm(context, client_principal, client_principal_pac)) {
317 DEBUG(2, ("Name in PAC [%s] does not match principal name in ticket\n",
318 logon_name->account_name));
319 krb5_free_principal(context, client_principal_pac);
320 return NT_STATUS_ACCESS_DENIED;
321 }
322
323 krb5_free_principal(context, client_principal_pac);
324
325#if 0
326 if (strcasecmp(logon_info->info3.base.account_name.string,
327 "Administrator")== 0) {
328 file_save("tmp_pac_data-admin.dat",blob.data,blob.length);
329 }
330#endif
331
332 DEBUG(3,("Found account name from PAC: %s [%s]\n",
333 logon_info->info3.base.account_name.string,
334 logon_info->info3.base.full_name.string));
335 *pac_data_out = pac_data;
336
337 return NT_STATUS_OK;
338}
339
340_PUBLIC_ NTSTATUS kerberos_pac_logon_info(TALLOC_CTX *mem_ctx,
341 struct PAC_LOGON_INFO **logon_info,
342 DATA_BLOB blob,
343 krb5_context context,
344 const krb5_keyblock *krbtgt_keyblock,
345 const krb5_keyblock *service_keyblock,
346 krb5_const_principal client_principal,
347 time_t tgs_authtime,
348 krb5_error_code *k5ret)
349{
350 NTSTATUS nt_status;
351 struct PAC_DATA *pac_data;
352 int i;
353 nt_status = kerberos_decode_pac(mem_ctx,
354 &pac_data,
355 blob,
356 context,
357 krbtgt_keyblock,
358 service_keyblock,
359 client_principal,
360 tgs_authtime,
361 k5ret);
362 if (!NT_STATUS_IS_OK(nt_status)) {
363 return nt_status;
364 }
365
366 *logon_info = NULL;
367 for (i=0; i < pac_data->num_buffers; i++) {
368 if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
369 continue;
370 }
371 *logon_info = pac_data->buffers[i].info->logon_info.info;
372 }
373 if (!*logon_info) {
374 return NT_STATUS_INVALID_PARAMETER;
375 }
376 return NT_STATUS_OK;
377}
378
379static krb5_error_code make_pac_checksum(TALLOC_CTX *mem_ctx,
380 DATA_BLOB *pac_data,
381 struct PAC_SIGNATURE_DATA *sig,
382 krb5_context context,
383 const krb5_keyblock *keyblock)
384{
385 krb5_error_code ret;
386 krb5_crypto crypto;
387 Checksum cksum;
388
389
390 ret = krb5_crypto_init(context,
391 keyblock,
392 0,
393 &crypto);
394 if (ret) {
395 DEBUG(0,("krb5_crypto_init() failed: %s\n",
396 smb_get_krb5_error_message(context, ret, mem_ctx)));
397 return ret;
398 }
399 ret = krb5_create_checksum(context,
400 crypto,
401 KRB5_KU_OTHER_CKSUM,
402 0,
403 pac_data->data,
404 pac_data->length,
405 &cksum);
406 if (ret) {
407 DEBUG(2, ("PAC Verification failed: %s\n",
408 smb_get_krb5_error_message(context, ret, mem_ctx)));
409 }
410
411 krb5_crypto_destroy(context, crypto);
412
413 if (ret) {
414 return ret;
415 }
416
417 sig->type = cksum.cksumtype;
418 sig->signature = data_blob_talloc(mem_ctx, cksum.checksum.data, cksum.checksum.length);
419 free_Checksum(&cksum);
420
421 return 0;
422}
423
424 krb5_error_code kerberos_encode_pac(TALLOC_CTX *mem_ctx,
425 struct PAC_DATA *pac_data,
426 krb5_context context,
427 const krb5_keyblock *krbtgt_keyblock,
428 const krb5_keyblock *service_keyblock,
429 DATA_BLOB *pac)
430{
431 NTSTATUS nt_status;
432 krb5_error_code ret;
433 enum ndr_err_code ndr_err;
434 DATA_BLOB zero_blob = data_blob(NULL, 0);
435 DATA_BLOB tmp_blob = data_blob(NULL, 0);
436 struct PAC_SIGNATURE_DATA *kdc_checksum = NULL;
437 struct PAC_SIGNATURE_DATA *srv_checksum = NULL;
438 int i;
439
440 /* First, just get the keytypes filled in (and lengths right, eventually) */
441 for (i=0; i < pac_data->num_buffers; i++) {
442 if (pac_data->buffers[i].type != PAC_TYPE_KDC_CHECKSUM) {
443 continue;
444 }
445 kdc_checksum = &pac_data->buffers[i].info->kdc_cksum,
446 ret = make_pac_checksum(mem_ctx, &zero_blob,
447 kdc_checksum,
448 context, krbtgt_keyblock);
449 if (ret) {
450 DEBUG(2, ("making krbtgt PAC checksum failed: %s\n",
451 smb_get_krb5_error_message(context, ret, mem_ctx)));
452 talloc_free(pac_data);
453 return ret;
454 }
455 }
456
457 for (i=0; i < pac_data->num_buffers; i++) {
458 if (pac_data->buffers[i].type != PAC_TYPE_SRV_CHECKSUM) {
459 continue;
460 }
461 srv_checksum = &pac_data->buffers[i].info->srv_cksum;
462 ret = make_pac_checksum(mem_ctx, &zero_blob,
463 srv_checksum,
464 context, service_keyblock);
465 if (ret) {
466 DEBUG(2, ("making service PAC checksum failed: %s\n",
467 smb_get_krb5_error_message(context, ret, mem_ctx)));
468 talloc_free(pac_data);
469 return ret;
470 }
471 }
472
473 if (!kdc_checksum) {
474 DEBUG(2, ("Invalid PAC constructed for signing, no KDC checksum present!"));
475 return EINVAL;
476 }
477 if (!srv_checksum) {
478 DEBUG(2, ("Invalid PAC constructed for signing, no SRV checksum present!"));
479 return EINVAL;
480 }
481
482 /* But wipe out the actual signatures */
483 memset(kdc_checksum->signature.data, '\0', kdc_checksum->signature.length);
484 memset(srv_checksum->signature.data, '\0', srv_checksum->signature.length);
485
486 ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
487 pac_data,
488 (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
489 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
490 nt_status = ndr_map_error2ntstatus(ndr_err);
491 DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
492 talloc_free(pac_data);
493 return EINVAL;
494 }
495
496 /* Then sign the result of the previous push, where the sig was zero'ed out */
497 ret = make_pac_checksum(mem_ctx, &tmp_blob, srv_checksum,
498 context, service_keyblock);
499
500 /* Then sign Server checksum */
501 ret = make_pac_checksum(mem_ctx, &srv_checksum->signature, kdc_checksum, context, krbtgt_keyblock);
502 if (ret) {
503 DEBUG(2, ("making krbtgt PAC checksum failed: %s\n",
504 smb_get_krb5_error_message(context, ret, mem_ctx)));
505 talloc_free(pac_data);
506 return ret;
507 }
508
509 /* And push it out again, this time to the world. This relies on determanistic pointer values */
510 ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
511 pac_data,
512 (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
513 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
514 nt_status = ndr_map_error2ntstatus(ndr_err);
515 DEBUG(1, ("PAC (final) push failed: %s\n", nt_errstr(nt_status)));
516 talloc_free(pac_data);
517 return EINVAL;
518 }
519
520 *pac = tmp_blob;
521
522 return ret;
523}
524
525
526 krb5_error_code kerberos_create_pac(TALLOC_CTX *mem_ctx,
527 struct auth_user_info_dc *user_info_dc,
528 krb5_context context,
529 const krb5_keyblock *krbtgt_keyblock,
530 const krb5_keyblock *service_keyblock,
531 krb5_principal client_principal,
532 time_t tgs_authtime,
533 DATA_BLOB *pac)
534{
535 NTSTATUS nt_status;
536 krb5_error_code ret;
537 struct PAC_DATA *pac_data = talloc(mem_ctx, struct PAC_DATA);
538 struct netr_SamInfo3 *sam3;
539 union PAC_INFO *u_LOGON_INFO;
540 struct PAC_LOGON_INFO *LOGON_INFO;
541 union PAC_INFO *u_LOGON_NAME;
542 struct PAC_LOGON_NAME *LOGON_NAME;
543 union PAC_INFO *u_KDC_CHECKSUM;
544 union PAC_INFO *u_SRV_CHECKSUM;
545
546 char *name;
547
548 enum {
549 PAC_BUF_LOGON_INFO = 0,
550 PAC_BUF_LOGON_NAME = 1,
551 PAC_BUF_SRV_CHECKSUM = 2,
552 PAC_BUF_KDC_CHECKSUM = 3,
553 PAC_BUF_NUM_BUFFERS = 4
554 };
555
556 if (!pac_data) {
557 return ENOMEM;
558 }
559
560 pac_data->num_buffers = PAC_BUF_NUM_BUFFERS;
561 pac_data->version = 0;
562
563 pac_data->buffers = talloc_array(pac_data,
564 struct PAC_BUFFER,
565 pac_data->num_buffers);
566 if (!pac_data->buffers) {
567 talloc_free(pac_data);
568 return ENOMEM;
569 }
570
571 /* LOGON_INFO */
572 u_LOGON_INFO = talloc_zero(pac_data->buffers, union PAC_INFO);
573 if (!u_LOGON_INFO) {
574 talloc_free(pac_data);
575 return ENOMEM;
576 }
577 pac_data->buffers[PAC_BUF_LOGON_INFO].type = PAC_TYPE_LOGON_INFO;
578 pac_data->buffers[PAC_BUF_LOGON_INFO].info = u_LOGON_INFO;
579
580 /* LOGON_NAME */
581 u_LOGON_NAME = talloc_zero(pac_data->buffers, union PAC_INFO);
582 if (!u_LOGON_NAME) {
583 talloc_free(pac_data);
584 return ENOMEM;
585 }
586 pac_data->buffers[PAC_BUF_LOGON_NAME].type = PAC_TYPE_LOGON_NAME;
587 pac_data->buffers[PAC_BUF_LOGON_NAME].info = u_LOGON_NAME;
588 LOGON_NAME = &u_LOGON_NAME->logon_name;
589
590 /* SRV_CHECKSUM */
591 u_SRV_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
592 if (!u_SRV_CHECKSUM) {
593 talloc_free(pac_data);
594 return ENOMEM;
595 }
596 pac_data->buffers[PAC_BUF_SRV_CHECKSUM].type = PAC_TYPE_SRV_CHECKSUM;
597 pac_data->buffers[PAC_BUF_SRV_CHECKSUM].info = u_SRV_CHECKSUM;
598
599 /* KDC_CHECKSUM */
600 u_KDC_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
601 if (!u_KDC_CHECKSUM) {
602 talloc_free(pac_data);
603 return ENOMEM;
604 }
605 pac_data->buffers[PAC_BUF_KDC_CHECKSUM].type = PAC_TYPE_KDC_CHECKSUM;
606 pac_data->buffers[PAC_BUF_KDC_CHECKSUM].info = u_KDC_CHECKSUM;
607
608 /* now the real work begins... */
609
610 LOGON_INFO = talloc_zero(u_LOGON_INFO, struct PAC_LOGON_INFO);
611 if (!LOGON_INFO) {
612 talloc_free(pac_data);
613 return ENOMEM;
614 }
615 nt_status = auth_convert_user_info_dc_saminfo3(LOGON_INFO, user_info_dc, &sam3);
616 if (!NT_STATUS_IS_OK(nt_status)) {
617 DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
618 talloc_free(pac_data);
619 return EINVAL;
620 }
621
622 u_LOGON_INFO->logon_info.info = LOGON_INFO;
623 LOGON_INFO->info3 = *sam3;
624
625 ret = krb5_unparse_name_flags(context, client_principal,
626 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &name);
627 if (ret) {
628 return ret;
629 }
630 LOGON_NAME->account_name = talloc_strdup(LOGON_NAME, name);
631 free(name);
632 /*
633 this logon_time field is absolutely critical. This is what
634 caused all our PAC troubles :-)
635 */
636 unix_to_nt_time(&LOGON_NAME->logon_time, tgs_authtime);
637
638 ret = kerberos_encode_pac(mem_ctx,
639 pac_data,
640 context,
641 krbtgt_keyblock,
642 service_keyblock,
643 pac);
644 talloc_free(pac_data);
645 return ret;
646}
647
648krb5_error_code kerberos_pac_to_user_info_dc(TALLOC_CTX *mem_ctx,
649 krb5_pac pac,
650 krb5_context context,
651 struct auth_user_info_dc **user_info_dc,
652 struct PAC_SIGNATURE_DATA *pac_srv_sig,
653 struct PAC_SIGNATURE_DATA *pac_kdc_sig)
654{
655 NTSTATUS nt_status;
656 enum ndr_err_code ndr_err;
657 krb5_error_code ret;
658
659 DATA_BLOB pac_logon_info_in, pac_srv_checksum_in, pac_kdc_checksum_in;
660 krb5_data k5pac_logon_info_in, k5pac_srv_checksum_in, k5pac_kdc_checksum_in;
661
662 union PAC_INFO info;
663 struct auth_user_info_dc *user_info_dc_out;
664
665 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
666
667 if (!tmp_ctx) {
668 return ENOMEM;
669 }
670
671 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_LOGON_INFO, &k5pac_logon_info_in);
672 if (ret != 0) {
673 talloc_free(tmp_ctx);
674 return EINVAL;
675 }
676
677 pac_logon_info_in = data_blob_const(k5pac_logon_info_in.data, k5pac_logon_info_in.length);
678
679 ndr_err = ndr_pull_union_blob(&pac_logon_info_in, tmp_ctx, &info,
680 PAC_TYPE_LOGON_INFO,
681 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
682 krb5_data_free(&k5pac_logon_info_in);
683 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err) || !info.logon_info.info) {
684 nt_status = ndr_map_error2ntstatus(ndr_err);
685 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
686 talloc_free(tmp_ctx);
687 return EINVAL;
688 }
689
690 /* Pull this right into the normal auth sysstem structures */
691 nt_status = make_user_info_dc_pac(mem_ctx,
692 info.logon_info.info,
693 &user_info_dc_out);
694 if (!NT_STATUS_IS_OK(nt_status)) {
695 talloc_free(tmp_ctx);
696 return EINVAL;
697 }
698
699 if (pac_srv_sig) {
700 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_SRV_CHECKSUM, &k5pac_srv_checksum_in);
701 if (ret != 0) {
702 talloc_free(tmp_ctx);
703 return ret;
704 }
705
706 pac_srv_checksum_in = data_blob_const(k5pac_srv_checksum_in.data, k5pac_srv_checksum_in.length);
707
708 ndr_err = ndr_pull_struct_blob(&pac_srv_checksum_in, pac_srv_sig,
709 pac_srv_sig,
710 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
711 krb5_data_free(&k5pac_srv_checksum_in);
712 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
713 nt_status = ndr_map_error2ntstatus(ndr_err);
714 DEBUG(0,("can't parse the KDC signature: %s\n",
715 nt_errstr(nt_status)));
716 return EINVAL;
717 }
718 }
719
720 if (pac_kdc_sig) {
721 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_KDC_CHECKSUM, &k5pac_kdc_checksum_in);
722 if (ret != 0) {
723 talloc_free(tmp_ctx);
724 return ret;
725 }
726
727 pac_kdc_checksum_in = data_blob_const(k5pac_kdc_checksum_in.data, k5pac_kdc_checksum_in.length);
728
729 ndr_err = ndr_pull_struct_blob(&pac_kdc_checksum_in, pac_kdc_sig,
730 pac_kdc_sig,
731 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
732 krb5_data_free(&k5pac_kdc_checksum_in);
733 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
734 nt_status = ndr_map_error2ntstatus(ndr_err);
735 DEBUG(0,("can't parse the KDC signature: %s\n",
736 nt_errstr(nt_status)));
737 return EINVAL;
738 }
739 }
740 *user_info_dc = user_info_dc_out;
741
742 return 0;
743}
744
745
746NTSTATUS kerberos_pac_blob_to_user_info_dc(TALLOC_CTX *mem_ctx,
747 DATA_BLOB pac_blob,
748 krb5_context context,
749 struct auth_user_info_dc **user_info_dc,
750 struct PAC_SIGNATURE_DATA *pac_srv_sig,
751 struct PAC_SIGNATURE_DATA *pac_kdc_sig)
752{
753 krb5_error_code ret;
754 krb5_pac pac;
755 ret = krb5_pac_parse(context,
756 pac_blob.data, pac_blob.length,
757 &pac);
758 if (ret) {
759 return map_nt_error_from_unix(ret);
760 }
761
762
763 ret = kerberos_pac_to_user_info_dc(mem_ctx, pac, context, user_info_dc, pac_srv_sig, pac_kdc_sig);
764 krb5_pac_free(context, pac);
765 if (ret) {
766 return map_nt_error_from_unix(ret);
767 }
768 return NT_STATUS_OK;
769}
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