source: branches/samba-3.5.x/source4/auth/kerberos/kerberos_pac.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 22.4 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 "lib/ldb/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 smb_iconv_convenience *iconv_convenience,
70 struct PAC_DATA **pac_data_out,
71 DATA_BLOB blob,
72 krb5_context context,
73 const krb5_keyblock *krbtgt_keyblock,
74 const krb5_keyblock *service_keyblock,
75 krb5_const_principal client_principal,
76 time_t tgs_authtime,
77 krb5_error_code *k5ret)
78{
79 krb5_error_code ret;
80 NTSTATUS status;
81 enum ndr_err_code ndr_err;
82 struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL;
83 struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL;
84 struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL;
85 struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL;
86 struct PAC_LOGON_INFO *logon_info = NULL;
87 struct PAC_LOGON_NAME *logon_name = NULL;
88 struct PAC_DATA *pac_data;
89 struct PAC_DATA_RAW *pac_data_raw;
90
91 DATA_BLOB *srv_sig_blob = NULL;
92 DATA_BLOB *kdc_sig_blob = NULL;
93
94 DATA_BLOB modified_pac_blob;
95 NTTIME tgs_authtime_nttime;
96 krb5_principal client_principal_pac;
97 int i;
98
99 krb5_clear_error_message(context);
100
101 if (k5ret) {
102 *k5ret = KRB5_PARSE_MALFORMED;
103 }
104
105 pac_data = talloc(mem_ctx, struct PAC_DATA);
106 pac_data_raw = talloc(mem_ctx, struct PAC_DATA_RAW);
107 kdc_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
108 srv_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
109 if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
110 if (k5ret) {
111 *k5ret = ENOMEM;
112 }
113 return NT_STATUS_NO_MEMORY;
114 }
115
116 ndr_err = ndr_pull_struct_blob(&blob, pac_data,
117 iconv_convenience, pac_data,
118 (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
119 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
120 status = ndr_map_error2ntstatus(ndr_err);
121 DEBUG(0,("can't parse the PAC: %s\n",
122 nt_errstr(status)));
123 return status;
124 }
125
126 if (pac_data->num_buffers < 4) {
127 /* we need logon_ingo, service_key and kdc_key */
128 DEBUG(0,("less than 4 PAC buffers\n"));
129 return NT_STATUS_INVALID_PARAMETER;
130 }
131
132 ndr_err = ndr_pull_struct_blob(&blob, pac_data_raw,
133 iconv_convenience, pac_data_raw,
134 (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW);
135 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
136 status = ndr_map_error2ntstatus(ndr_err);
137 DEBUG(0,("can't parse the PAC: %s\n",
138 nt_errstr(status)));
139 return status;
140 }
141
142 if (pac_data_raw->num_buffers < 4) {
143 /* we need logon_ingo, service_key and kdc_key */
144 DEBUG(0,("less than 4 PAC buffers\n"));
145 return NT_STATUS_INVALID_PARAMETER;
146 }
147
148 if (pac_data->num_buffers != pac_data_raw->num_buffers) {
149 /* we need logon_ingo, service_key and kdc_key */
150 DEBUG(0,("misparse! PAC_DATA has %d buffers while PAC_DATA_RAW has %d\n",
151 pac_data->num_buffers, pac_data_raw->num_buffers));
152 return NT_STATUS_INVALID_PARAMETER;
153 }
154
155 for (i=0; i < pac_data->num_buffers; i++) {
156 if (pac_data->buffers[i].type != pac_data_raw->buffers[i].type) {
157 DEBUG(0,("misparse! PAC_DATA buffer %d has type %d while PAC_DATA_RAW has %d\n",
158 i, pac_data->buffers[i].type, pac_data->buffers[i].type));
159 return NT_STATUS_INVALID_PARAMETER;
160 }
161 switch (pac_data->buffers[i].type) {
162 case PAC_TYPE_LOGON_INFO:
163 if (!pac_data->buffers[i].info) {
164 break;
165 }
166 logon_info = pac_data->buffers[i].info->logon_info.info;
167 break;
168 case PAC_TYPE_SRV_CHECKSUM:
169 if (!pac_data->buffers[i].info) {
170 break;
171 }
172 srv_sig_ptr = &pac_data->buffers[i].info->srv_cksum;
173 srv_sig_blob = &pac_data_raw->buffers[i].info->remaining;
174 break;
175 case PAC_TYPE_KDC_CHECKSUM:
176 if (!pac_data->buffers[i].info) {
177 break;
178 }
179 kdc_sig_ptr = &pac_data->buffers[i].info->kdc_cksum;
180 kdc_sig_blob = &pac_data_raw->buffers[i].info->remaining;
181 break;
182 case PAC_TYPE_LOGON_NAME:
183 logon_name = &pac_data->buffers[i].info->logon_name;
184 break;
185 default:
186 break;
187 }
188 }
189
190 if (!logon_info) {
191 DEBUG(0,("PAC no logon_info\n"));
192 return NT_STATUS_INVALID_PARAMETER;
193 }
194
195 if (!logon_name) {
196 DEBUG(0,("PAC no logon_name\n"));
197 return NT_STATUS_INVALID_PARAMETER;
198 }
199
200 if (!srv_sig_ptr || !srv_sig_blob) {
201 DEBUG(0,("PAC no srv_key\n"));
202 return NT_STATUS_INVALID_PARAMETER;
203 }
204
205 if (!kdc_sig_ptr || !kdc_sig_blob) {
206 DEBUG(0,("PAC no kdc_key\n"));
207 return NT_STATUS_INVALID_PARAMETER;
208 }
209
210 /* Find and zero out the signatures, as required by the signing algorithm */
211
212 /* We find the data blobs above, now we parse them to get at the exact portion we should zero */
213 ndr_err = ndr_pull_struct_blob(kdc_sig_blob, kdc_sig_wipe,
214 iconv_convenience, kdc_sig_wipe,
215 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
216 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
217 status = ndr_map_error2ntstatus(ndr_err);
218 DEBUG(0,("can't parse the KDC signature: %s\n",
219 nt_errstr(status)));
220 return status;
221 }
222
223 ndr_err = ndr_pull_struct_blob(srv_sig_blob, srv_sig_wipe,
224 iconv_convenience, srv_sig_wipe,
225 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
226 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
227 status = ndr_map_error2ntstatus(ndr_err);
228 DEBUG(0,("can't parse the SRV signature: %s\n",
229 nt_errstr(status)));
230 return status;
231 }
232
233 /* Now zero the decoded structure */
234 memset(kdc_sig_wipe->signature.data, '\0', kdc_sig_wipe->signature.length);
235 memset(srv_sig_wipe->signature.data, '\0', srv_sig_wipe->signature.length);
236
237 /* and reencode, back into the same place it came from */
238 ndr_err = ndr_push_struct_blob(kdc_sig_blob, pac_data_raw,
239 iconv_convenience,
240 kdc_sig_wipe,
241 (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
242 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
243 status = ndr_map_error2ntstatus(ndr_err);
244 DEBUG(0,("can't repack the KDC signature: %s\n",
245 nt_errstr(status)));
246 return status;
247 }
248 ndr_err = ndr_push_struct_blob(srv_sig_blob, pac_data_raw,
249 iconv_convenience,
250 srv_sig_wipe,
251 (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
252 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
253 status = ndr_map_error2ntstatus(ndr_err);
254 DEBUG(0,("can't repack the SRV signature: %s\n",
255 nt_errstr(status)));
256 return status;
257 }
258
259 /* push out the whole structure, but now with zero'ed signatures */
260 ndr_err = ndr_push_struct_blob(&modified_pac_blob, pac_data_raw,
261 iconv_convenience,
262 pac_data_raw,
263 (ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW);
264 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
265 status = ndr_map_error2ntstatus(ndr_err);
266 DEBUG(0,("can't repack the RAW PAC: %s\n",
267 nt_errstr(status)));
268 return status;
269 }
270
271 /* verify by service_key */
272 ret = check_pac_checksum(mem_ctx,
273 modified_pac_blob, srv_sig_ptr,
274 context,
275 service_keyblock);
276 if (ret) {
277 DEBUG(1, ("PAC Decode: Failed to verify the service signature: %s\n",
278 smb_get_krb5_error_message(context, ret, mem_ctx)));
279 if (k5ret) {
280 *k5ret = ret;
281 }
282 return NT_STATUS_ACCESS_DENIED;
283 }
284
285 if (krbtgt_keyblock) {
286 ret = check_pac_checksum(mem_ctx,
287 srv_sig_ptr->signature, kdc_sig_ptr,
288 context, krbtgt_keyblock);
289 if (ret) {
290 DEBUG(1, ("PAC Decode: Failed to verify the KDC signature: %s\n",
291 smb_get_krb5_error_message(context, ret, mem_ctx)));
292 if (k5ret) {
293 *k5ret = ret;
294 }
295 return NT_STATUS_ACCESS_DENIED;
296 }
297 }
298
299 /* Convert to NT time, so as not to loose accuracy in comparison */
300 unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
301
302 if (tgs_authtime_nttime != logon_name->logon_time) {
303 DEBUG(2, ("PAC Decode: Logon time mismatch between ticket and PAC!\n"));
304 DEBUG(2, ("PAC Decode: PAC: %s\n", nt_time_string(mem_ctx, logon_name->logon_time)));
305 DEBUG(2, ("PAC Decode: Ticket: %s\n", nt_time_string(mem_ctx, tgs_authtime_nttime)));
306 return NT_STATUS_ACCESS_DENIED;
307 }
308
309 ret = krb5_parse_name_flags(context, logon_name->account_name, KRB5_PRINCIPAL_PARSE_NO_REALM,
310 &client_principal_pac);
311 if (ret) {
312 DEBUG(2, ("Could not parse name from incoming PAC: [%s]: %s\n",
313 logon_name->account_name,
314 smb_get_krb5_error_message(context, ret, mem_ctx)));
315 if (k5ret) {
316 *k5ret = ret;
317 }
318 return NT_STATUS_INVALID_PARAMETER;
319 }
320
321 if (!krb5_principal_compare_any_realm(context, client_principal, client_principal_pac)) {
322 DEBUG(2, ("Name in PAC [%s] does not match principal name in ticket\n",
323 logon_name->account_name));
324 return NT_STATUS_ACCESS_DENIED;
325 }
326
327#if 0
328 if (strcasecmp(logon_info->info3.base.account_name.string,
329 "Administrator")== 0) {
330 file_save("tmp_pac_data-admin.dat",blob.data,blob.length);
331 }
332#endif
333
334 DEBUG(3,("Found account name from PAC: %s [%s]\n",
335 logon_info->info3.base.account_name.string,
336 logon_info->info3.base.full_name.string));
337 *pac_data_out = pac_data;
338
339 return NT_STATUS_OK;
340}
341
342_PUBLIC_ NTSTATUS kerberos_pac_logon_info(TALLOC_CTX *mem_ctx,
343 struct smb_iconv_convenience *iconv_convenience,
344 struct PAC_LOGON_INFO **logon_info,
345 DATA_BLOB blob,
346 krb5_context context,
347 const krb5_keyblock *krbtgt_keyblock,
348 const krb5_keyblock *service_keyblock,
349 krb5_const_principal client_principal,
350 time_t tgs_authtime,
351 krb5_error_code *k5ret)
352{
353 NTSTATUS nt_status;
354 struct PAC_DATA *pac_data;
355 int i;
356 nt_status = kerberos_decode_pac(mem_ctx,
357 iconv_convenience,
358 &pac_data,
359 blob,
360 context,
361 krbtgt_keyblock,
362 service_keyblock,
363 client_principal,
364 tgs_authtime,
365 k5ret);
366 if (!NT_STATUS_IS_OK(nt_status)) {
367 return nt_status;
368 }
369
370 *logon_info = NULL;
371 for (i=0; i < pac_data->num_buffers; i++) {
372 if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
373 continue;
374 }
375 *logon_info = pac_data->buffers[i].info->logon_info.info;
376 }
377 if (!*logon_info) {
378 return NT_STATUS_INVALID_PARAMETER;
379 }
380 return NT_STATUS_OK;
381}
382
383static krb5_error_code make_pac_checksum(TALLOC_CTX *mem_ctx,
384 DATA_BLOB *pac_data,
385 struct PAC_SIGNATURE_DATA *sig,
386 krb5_context context,
387 const krb5_keyblock *keyblock)
388{
389 krb5_error_code ret;
390 krb5_crypto crypto;
391 Checksum cksum;
392
393
394 ret = krb5_crypto_init(context,
395 keyblock,
396 0,
397 &crypto);
398 if (ret) {
399 DEBUG(0,("krb5_crypto_init() failed: %s\n",
400 smb_get_krb5_error_message(context, ret, mem_ctx)));
401 return ret;
402 }
403 ret = krb5_create_checksum(context,
404 crypto,
405 KRB5_KU_OTHER_CKSUM,
406 0,
407 pac_data->data,
408 pac_data->length,
409 &cksum);
410 if (ret) {
411 DEBUG(2, ("PAC Verification failed: %s\n",
412 smb_get_krb5_error_message(context, ret, mem_ctx)));
413 }
414
415 krb5_crypto_destroy(context, crypto);
416
417 if (ret) {
418 return ret;
419 }
420
421 sig->type = cksum.cksumtype;
422 sig->signature = data_blob_talloc(mem_ctx, cksum.checksum.data, cksum.checksum.length);
423 free_Checksum(&cksum);
424
425 return 0;
426}
427
428 krb5_error_code kerberos_encode_pac(TALLOC_CTX *mem_ctx,
429 struct smb_iconv_convenience *iconv_convenience,
430 struct PAC_DATA *pac_data,
431 krb5_context context,
432 const krb5_keyblock *krbtgt_keyblock,
433 const krb5_keyblock *service_keyblock,
434 DATA_BLOB *pac)
435{
436 NTSTATUS nt_status;
437 krb5_error_code ret;
438 enum ndr_err_code ndr_err;
439 DATA_BLOB zero_blob = data_blob(NULL, 0);
440 DATA_BLOB tmp_blob = data_blob(NULL, 0);
441 struct PAC_SIGNATURE_DATA *kdc_checksum = NULL;
442 struct PAC_SIGNATURE_DATA *srv_checksum = NULL;
443 int i;
444
445 /* First, just get the keytypes filled in (and lengths right, eventually) */
446 for (i=0; i < pac_data->num_buffers; i++) {
447 if (pac_data->buffers[i].type != PAC_TYPE_KDC_CHECKSUM) {
448 continue;
449 }
450 kdc_checksum = &pac_data->buffers[i].info->kdc_cksum,
451 ret = make_pac_checksum(mem_ctx, &zero_blob,
452 kdc_checksum,
453 context, krbtgt_keyblock);
454 if (ret) {
455 DEBUG(2, ("making krbtgt PAC checksum failed: %s\n",
456 smb_get_krb5_error_message(context, ret, mem_ctx)));
457 talloc_free(pac_data);
458 return ret;
459 }
460 }
461
462 for (i=0; i < pac_data->num_buffers; i++) {
463 if (pac_data->buffers[i].type != PAC_TYPE_SRV_CHECKSUM) {
464 continue;
465 }
466 srv_checksum = &pac_data->buffers[i].info->srv_cksum;
467 ret = make_pac_checksum(mem_ctx, &zero_blob,
468 srv_checksum,
469 context, service_keyblock);
470 if (ret) {
471 DEBUG(2, ("making service PAC checksum failed: %s\n",
472 smb_get_krb5_error_message(context, ret, mem_ctx)));
473 talloc_free(pac_data);
474 return ret;
475 }
476 }
477
478 if (!kdc_checksum) {
479 DEBUG(2, ("Invalid PAC constructed for signing, no KDC checksum present!"));
480 return EINVAL;
481 }
482 if (!srv_checksum) {
483 DEBUG(2, ("Invalid PAC constructed for signing, no SRV checksum present!"));
484 return EINVAL;
485 }
486
487 /* But wipe out the actual signatures */
488 memset(kdc_checksum->signature.data, '\0', kdc_checksum->signature.length);
489 memset(srv_checksum->signature.data, '\0', srv_checksum->signature.length);
490
491 ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
492 iconv_convenience,
493 pac_data,
494 (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
495 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
496 nt_status = ndr_map_error2ntstatus(ndr_err);
497 DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
498 talloc_free(pac_data);
499 return EINVAL;
500 }
501
502 /* Then sign the result of the previous push, where the sig was zero'ed out */
503 ret = make_pac_checksum(mem_ctx, &tmp_blob, srv_checksum,
504 context, service_keyblock);
505
506 /* Then sign Server checksum */
507 ret = make_pac_checksum(mem_ctx, &srv_checksum->signature, kdc_checksum, context, krbtgt_keyblock);
508 if (ret) {
509 DEBUG(2, ("making krbtgt PAC checksum failed: %s\n",
510 smb_get_krb5_error_message(context, ret, mem_ctx)));
511 talloc_free(pac_data);
512 return ret;
513 }
514
515 /* And push it out again, this time to the world. This relies on determanistic pointer values */
516 ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
517 iconv_convenience,
518 pac_data,
519 (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
520 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
521 nt_status = ndr_map_error2ntstatus(ndr_err);
522 DEBUG(1, ("PAC (final) push failed: %s\n", nt_errstr(nt_status)));
523 talloc_free(pac_data);
524 return EINVAL;
525 }
526
527 *pac = tmp_blob;
528
529 return ret;
530}
531
532
533 krb5_error_code kerberos_create_pac(TALLOC_CTX *mem_ctx,
534 struct smb_iconv_convenience *iconv_convenience,
535 struct auth_serversupplied_info *server_info,
536 krb5_context context,
537 const krb5_keyblock *krbtgt_keyblock,
538 const krb5_keyblock *service_keyblock,
539 krb5_principal client_principal,
540 time_t tgs_authtime,
541 DATA_BLOB *pac)
542{
543 NTSTATUS nt_status;
544 krb5_error_code ret;
545 struct PAC_DATA *pac_data = talloc(mem_ctx, struct PAC_DATA);
546 struct netr_SamInfo3 *sam3;
547 union PAC_INFO *u_LOGON_INFO;
548 struct PAC_LOGON_INFO *LOGON_INFO;
549 union PAC_INFO *u_LOGON_NAME;
550 struct PAC_LOGON_NAME *LOGON_NAME;
551 union PAC_INFO *u_KDC_CHECKSUM;
552 union PAC_INFO *u_SRV_CHECKSUM;
553
554 char *name;
555
556 enum {
557 PAC_BUF_LOGON_INFO = 0,
558 PAC_BUF_LOGON_NAME = 1,
559 PAC_BUF_SRV_CHECKSUM = 2,
560 PAC_BUF_KDC_CHECKSUM = 3,
561 PAC_BUF_NUM_BUFFERS = 4
562 };
563
564 if (!pac_data) {
565 return ENOMEM;
566 }
567
568 pac_data->num_buffers = PAC_BUF_NUM_BUFFERS;
569 pac_data->version = 0;
570
571 pac_data->buffers = talloc_array(pac_data,
572 struct PAC_BUFFER,
573 pac_data->num_buffers);
574 if (!pac_data->buffers) {
575 talloc_free(pac_data);
576 return ENOMEM;
577 }
578
579 /* LOGON_INFO */
580 u_LOGON_INFO = talloc_zero(pac_data->buffers, union PAC_INFO);
581 if (!u_LOGON_INFO) {
582 talloc_free(pac_data);
583 return ENOMEM;
584 }
585 pac_data->buffers[PAC_BUF_LOGON_INFO].type = PAC_TYPE_LOGON_INFO;
586 pac_data->buffers[PAC_BUF_LOGON_INFO].info = u_LOGON_INFO;
587
588 /* LOGON_NAME */
589 u_LOGON_NAME = talloc_zero(pac_data->buffers, union PAC_INFO);
590 if (!u_LOGON_NAME) {
591 talloc_free(pac_data);
592 return ENOMEM;
593 }
594 pac_data->buffers[PAC_BUF_LOGON_NAME].type = PAC_TYPE_LOGON_NAME;
595 pac_data->buffers[PAC_BUF_LOGON_NAME].info = u_LOGON_NAME;
596 LOGON_NAME = &u_LOGON_NAME->logon_name;
597
598 /* SRV_CHECKSUM */
599 u_SRV_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
600 if (!u_SRV_CHECKSUM) {
601 talloc_free(pac_data);
602 return ENOMEM;
603 }
604 pac_data->buffers[PAC_BUF_SRV_CHECKSUM].type = PAC_TYPE_SRV_CHECKSUM;
605 pac_data->buffers[PAC_BUF_SRV_CHECKSUM].info = u_SRV_CHECKSUM;
606
607 /* KDC_CHECKSUM */
608 u_KDC_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
609 if (!u_KDC_CHECKSUM) {
610 talloc_free(pac_data);
611 return ENOMEM;
612 }
613 pac_data->buffers[PAC_BUF_KDC_CHECKSUM].type = PAC_TYPE_KDC_CHECKSUM;
614 pac_data->buffers[PAC_BUF_KDC_CHECKSUM].info = u_KDC_CHECKSUM;
615
616 /* now the real work begins... */
617
618 LOGON_INFO = talloc_zero(u_LOGON_INFO, struct PAC_LOGON_INFO);
619 if (!LOGON_INFO) {
620 talloc_free(pac_data);
621 return ENOMEM;
622 }
623 nt_status = auth_convert_server_info_saminfo3(LOGON_INFO, server_info, &sam3);
624 if (!NT_STATUS_IS_OK(nt_status)) {
625 DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
626 talloc_free(pac_data);
627 return EINVAL;
628 }
629
630 u_LOGON_INFO->logon_info.info = LOGON_INFO;
631 LOGON_INFO->info3 = *sam3;
632
633 ret = krb5_unparse_name_flags(context, client_principal,
634 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &name);
635 if (ret) {
636 return ret;
637 }
638 LOGON_NAME->account_name = talloc_strdup(LOGON_NAME, name);
639 free(name);
640 /*
641 this logon_time field is absolutely critical. This is what
642 caused all our PAC troubles :-)
643 */
644 unix_to_nt_time(&LOGON_NAME->logon_time, tgs_authtime);
645
646 ret = kerberos_encode_pac(mem_ctx,
647 iconv_convenience,
648 pac_data,
649 context,
650 krbtgt_keyblock,
651 service_keyblock,
652 pac);
653 talloc_free(pac_data);
654 return ret;
655}
656
657krb5_error_code kerberos_pac_to_server_info(TALLOC_CTX *mem_ctx,
658 struct smb_iconv_convenience *iconv_convenience,
659 krb5_pac pac,
660 krb5_context context,
661 struct auth_serversupplied_info **server_info)
662{
663 NTSTATUS nt_status;
664 enum ndr_err_code ndr_err;
665 krb5_error_code ret;
666
667 DATA_BLOB pac_logon_info_in, pac_srv_checksum_in, pac_kdc_checksum_in;
668 krb5_data k5pac_logon_info_in, k5pac_srv_checksum_in, k5pac_kdc_checksum_in;
669
670 union PAC_INFO info;
671 union netr_Validation validation;
672 struct auth_serversupplied_info *server_info_out;
673
674 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
675
676 if (!tmp_ctx) {
677 return ENOMEM;
678 }
679
680 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_LOGON_INFO, &k5pac_logon_info_in);
681 if (ret != 0) {
682 talloc_free(tmp_ctx);
683 return EINVAL;
684 }
685
686 pac_logon_info_in = data_blob_const(k5pac_logon_info_in.data, k5pac_logon_info_in.length);
687
688 ndr_err = ndr_pull_union_blob(&pac_logon_info_in, tmp_ctx, iconv_convenience, &info,
689 PAC_TYPE_LOGON_INFO,
690 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
691 krb5_data_free(&k5pac_logon_info_in);
692 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err) || !info.logon_info.info) {
693 nt_status = ndr_map_error2ntstatus(ndr_err);
694 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
695 talloc_free(tmp_ctx);
696 return EINVAL;
697 }
698
699 /* Pull this right into the normal auth sysstem structures */
700 validation.sam3 = &info.logon_info.info->info3;
701 nt_status = make_server_info_netlogon_validation(mem_ctx,
702 "",
703 3, &validation,
704 &server_info_out);
705 if (!NT_STATUS_IS_OK(nt_status)) {
706 talloc_free(tmp_ctx);
707 return EINVAL;
708 }
709
710 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_SRV_CHECKSUM, &k5pac_srv_checksum_in);
711 if (ret != 0) {
712 talloc_free(tmp_ctx);
713 return ret;
714 }
715
716 pac_srv_checksum_in = data_blob_const(k5pac_srv_checksum_in.data, k5pac_srv_checksum_in.length);
717
718 ndr_err = ndr_pull_struct_blob(&pac_srv_checksum_in, server_info_out,
719 iconv_convenience, &server_info_out->pac_srv_sig,
720 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
721 krb5_data_free(&k5pac_srv_checksum_in);
722 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
723 nt_status = ndr_map_error2ntstatus(ndr_err);
724 DEBUG(0,("can't parse the KDC signature: %s\n",
725 nt_errstr(nt_status)));
726 return EINVAL;
727 }
728
729 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_KDC_CHECKSUM, &k5pac_kdc_checksum_in);
730 if (ret != 0) {
731 talloc_free(tmp_ctx);
732 return ret;
733 }
734
735 pac_kdc_checksum_in = data_blob_const(k5pac_kdc_checksum_in.data, k5pac_kdc_checksum_in.length);
736
737 ndr_err = ndr_pull_struct_blob(&pac_kdc_checksum_in, server_info_out,
738 iconv_convenience, &server_info_out->pac_kdc_sig,
739 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
740 krb5_data_free(&k5pac_kdc_checksum_in);
741 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
742 nt_status = ndr_map_error2ntstatus(ndr_err);
743 DEBUG(0,("can't parse the KDC signature: %s\n",
744 nt_errstr(nt_status)));
745 return EINVAL;
746 }
747
748 *server_info = server_info_out;
749
750 return 0;
751}
752
753
754NTSTATUS kerberos_pac_blob_to_server_info(TALLOC_CTX *mem_ctx,
755 struct smb_iconv_convenience *iconv_convenience,
756 DATA_BLOB pac_blob,
757 krb5_context context,
758 struct auth_serversupplied_info **server_info)
759{
760 krb5_error_code ret;
761 krb5_pac pac;
762 ret = krb5_pac_parse(context,
763 pac_blob.data, pac_blob.length,
764 &pac);
765 if (ret) {
766 return map_nt_error_from_unix(ret);
767 }
768
769
770 ret = kerberos_pac_to_server_info(mem_ctx, iconv_convenience, pac, context, server_info);
771 krb5_pac_free(context, pac);
772 if (ret) {
773 return map_nt_error_from_unix(ret);
774 }
775 return NT_STATUS_OK;
776}
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