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s3/docs: Fix typo.
[Samba/bjacke.git] / source3 / libads / authdata.c
blob0032e9e4f651724dd42608d8de3e76279e266bd7
1 /*
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
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 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/>.
23 */
24
25 #include "includes.h"
26 #include "librpc/gen_ndr/ndr_krb5pac.h"
27
28 #ifdef HAVE_KRB5
29
30 /****************************************************************
31 ****************************************************************/
32
33 static krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
34 DATA_BLOB pac_data,
35 struct PAC_SIGNATURE_DATA *sig,
36 krb5_context context,
37 krb5_keyblock *keyblock)
38 {
39 krb5_error_code ret;
40 krb5_checksum cksum;
41 krb5_keyusage usage = 0;
42
43 smb_krb5_checksum_from_pac_sig(&cksum, sig);
44
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;
49 #else
50 #error UNKNOWN_KRB5_KEYUSAGE
51 #endif
52
53 ret = smb_krb5_verify_checksum(context,
54 keyblock,
55 usage,
56 &cksum,
57 pac_data.data,
58 pac_data.length);
59
60 if (ret) {
61 DEBUG(2,("check_pac_checksum: PAC Verification failed: %s (%d)\n",
62 error_message(ret), ret));
63 return ret;
64 }
65
66 return ret;
67 }
68
69 /****************************************************************
70 ****************************************************************/
71
72 NTSTATUS decode_pac_data(TALLOC_CTX *mem_ctx,
73 DATA_BLOB *pac_data_blob,
74 krb5_context context,
75 krb5_keyblock *service_keyblock,
76 krb5_const_principal client_principal,
77 time_t tgs_authtime,
78 struct PAC_DATA **pac_data_out)
79 {
80 NTSTATUS status;
81 enum ndr_err_code ndr_err;
82 krb5_error_code ret;
83 DATA_BLOB modified_pac_blob;
84
85 NTTIME tgs_authtime_nttime;
86 krb5_principal client_principal_pac = NULL;
87 int i;
88
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;
97
98 DATA_BLOB *srv_sig_blob = NULL;
99 DATA_BLOB *kdc_sig_blob = NULL;
100
101 *pac_data_out = NULL;
102
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;
109 }
110
111 ndr_err = ndr_pull_struct_blob(pac_data_blob, pac_data,
112 NULL, 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",
117 nt_errstr(status)));
118 return status;
119 }
120
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;
125 }
126
127 ndr_err = ndr_pull_struct_blob(pac_data_blob, pac_data_raw,
128 NULL, 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",
133 nt_errstr(status)));
134 return status;
135 }
136
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;
141 }
142
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;
148 }
149
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;
155 }
156 switch (pac_data->buffers[i].type) {
157 case PAC_TYPE_LOGON_INFO:
158 if (!pac_data->buffers[i].info) {
159 break;
160 }
161 logon_info = pac_data->buffers[i].info->logon_info.info;
162 break;
163 case PAC_TYPE_SRV_CHECKSUM:
164 if (!pac_data->buffers[i].info) {
165 break;
166 }
167 srv_sig_ptr = &pac_data->buffers[i].info->srv_cksum;
168 srv_sig_blob = &pac_data_raw->buffers[i].info->remaining;
169 break;
170 case PAC_TYPE_KDC_CHECKSUM:
171 if (!pac_data->buffers[i].info) {
172 break;
173 }
174 kdc_sig_ptr = &pac_data->buffers[i].info->kdc_cksum;
175 kdc_sig_blob = &pac_data_raw->buffers[i].info->remaining;
176 break;
177 case PAC_TYPE_LOGON_NAME:
178 logon_name = &pac_data->buffers[i].info->logon_name;
179 break;
180 default:
181 break;
182 }
183 }
184
185 if (!logon_info) {
186 DEBUG(0,("PAC no logon_info\n"));
187 return NT_STATUS_INVALID_PARAMETER;
188 }
189
190 if (!logon_name) {
191 DEBUG(0,("PAC no logon_name\n"));
192 return NT_STATUS_INVALID_PARAMETER;
193 }
194
195 if (!srv_sig_ptr || !srv_sig_blob) {
196 DEBUG(0,("PAC no srv_key\n"));
197 return NT_STATUS_INVALID_PARAMETER;
198 }
199
200 if (!kdc_sig_ptr || !kdc_sig_blob) {
201 DEBUG(0,("PAC no kdc_key\n"));
202 return NT_STATUS_INVALID_PARAMETER;
203 }
204
205 /* Find and zero out the signatures, as required by the signing algorithm */
206
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,
209 NULL, 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",
214 nt_errstr(status)));
215 return status;
216 }
217
218 ndr_err = ndr_pull_struct_blob(srv_sig_blob, srv_sig_wipe,
219 NULL, 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",
224 nt_errstr(status)));
225 return status;
226 }
227
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);
231
232 /* and reencode, back into the same place it came from */
233 ndr_err = ndr_push_struct_blob(kdc_sig_blob, pac_data_raw,
234 NULL, kdc_sig_wipe,
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",
239 nt_errstr(status)));
240 return status;
241 }
242 ndr_err = ndr_push_struct_blob(srv_sig_blob, pac_data_raw,
243 NULL, srv_sig_wipe,
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",
248 nt_errstr(status)));
249 return status;
250 }
251
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,
254 NULL, 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",
259 nt_errstr(status)));
260 return status;
261 }
262
263 /* verify by service_key */
264 ret = check_pac_checksum(mem_ctx,
265 modified_pac_blob, srv_sig_ptr,
266 context,
267 service_keyblock);
268 if (ret) {
269 DEBUG(1, ("PAC Decode: Failed to verify the service signature: %s\n",
270 error_message(ret)));
271 return NT_STATUS_ACCESS_DENIED;
272 }
273
274 /* Convert to NT time, so as not to loose accuracy in comparison */
275 unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
276
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;
282 }
283
284 ret = smb_krb5_parse_name_norealm(context, logon_name->account_name,
285 &client_principal_pac);
286 if (ret) {
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;
291 }
292
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;
298 }
299
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));
303
304 DEBUG(10,("Successfully validated Kerberos PAC\n"));
305
306 if (DEBUGLEVEL >= 10) {
307 const char *s;
308 s = NDR_PRINT_STRUCT_STRING(mem_ctx, PAC_DATA, pac_data);
309 if (s) {
310 DEBUGADD(10,("%s\n", s));
311 }
312 }
313
314 *pac_data_out = pac_data;
315
316 return NT_STATUS_OK;
317 }
318
319 /****************************************************************
320 ****************************************************************/
321
322 struct PAC_LOGON_INFO *get_logon_info_from_pac(struct PAC_DATA *pac_data)
323 {
324 int i;
325
326 for (i=0; i < pac_data->num_buffers; i++) {
327
328 if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
329 continue;
330 }
331
332 return pac_data->buffers[i].info->logon_info.info;
333 }
334
335 return NULL;
336 }
337
338 /****************************************************************
339 ****************************************************************/
340
341 NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
342 const char *name,
343 const char *pass,
344 time_t time_offset,
345 time_t *expire_time,
346 time_t *renew_till_time,
347 const char *cache_name,
348 bool request_pac,
349 bool add_netbios_addr,
350 time_t renewable_time,
351 struct PAC_DATA **pac_ret)
352 {
353 krb5_error_code ret;
354 NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
355 DATA_BLOB tkt, ap_rep, sesskey1, sesskey2;
356 struct PAC_DATA *pac_data = NULL;
357 char *client_princ_out = NULL;
358 const char *auth_princ = NULL;
359 const char *local_service = NULL;
360 const char *cc = "MEMORY:kerberos_return_pac";
361
362 ZERO_STRUCT(tkt);
363 ZERO_STRUCT(ap_rep);
364 ZERO_STRUCT(sesskey1);
365 ZERO_STRUCT(sesskey2);
366
367 if (!name || !pass) {
368 return NT_STATUS_INVALID_PARAMETER;
369 }
370
371 if (cache_name) {
372 cc = cache_name;
373 }
374
375 if (!strchr_m(name, '@')) {
376 auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
377 lp_realm());
378 } else {
379 auth_princ = name;
380 }
381 NT_STATUS_HAVE_NO_MEMORY(auth_princ);
382
383 local_service = talloc_asprintf(mem_ctx, "%s$@%s",
384 global_myname(), lp_realm());
385 NT_STATUS_HAVE_NO_MEMORY(local_service);
386
387 ret = kerberos_kinit_password_ext(auth_princ,
388 pass,
389 time_offset,
390 expire_time,
391 renew_till_time,
392 cc,
393 request_pac,
394 add_netbios_addr,
395 renewable_time,
396 &status);
397 if (ret) {
398 DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
399 auth_princ, error_message(ret), ret));
400 /* status already set */
401 goto out;
402 }
403
404 DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
405 if (expire_time) {
406 DEBUGADD(10,("\tvalid until: %s (%d)\n",
407 http_timestring(talloc_tos(), *expire_time),
408 (int)*expire_time));
409 }
410 if (renew_till_time) {
411 DEBUGADD(10,("\trenewable till: %s (%d)\n",
412 http_timestring(talloc_tos(), *renew_till_time),
413 (int)*renew_till_time));
414 }
415
416 /* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
417 * in that case fallback to NTLM - gd */
418
419 if (expire_time && renew_till_time &&
420 (*expire_time == 0) && (*renew_till_time == 0)) {
421 return NT_STATUS_INVALID_LOGON_TYPE;
422 }
423
424
425 ret = cli_krb5_get_ticket(local_service,
426 time_offset,
427 &tkt,
428 &sesskey1,
429 0,
430 cc,
431 NULL);
432 if (ret) {
433 DEBUG(1,("failed to get ticket for %s: %s\n",
434 local_service, error_message(ret)));
435 status = krb5_to_nt_status(ret);
436 goto out;
437 }
438
439 status = ads_verify_ticket(mem_ctx,
440 lp_realm(),
441 time_offset,
442 &tkt,
443 &client_princ_out,
444 &pac_data,
445 &ap_rep,
446 &sesskey2,
447 False);
448 if (!NT_STATUS_IS_OK(status)) {
449 DEBUG(1,("ads_verify_ticket failed: %s\n",
450 nt_errstr(status)));
451 goto out;
452 }
453
454 if (!pac_data) {
455 DEBUG(1,("no PAC\n"));
456 status = NT_STATUS_INVALID_PARAMETER;
457 goto out;
458 }
459
460 *pac_ret = pac_data;
461
462 out:
463 if (cc != cache_name) {
464 ads_kdestroy(cc);
465 }
466
467 data_blob_free(&tkt);
468 data_blob_free(&ap_rep);
469 data_blob_free(&sesskey1);
470 data_blob_free(&sesskey2);
471
472 TALLOC_FREE(client_princ_out);
473
474 return status;
475 }
476
477 /****************************************************************
478 ****************************************************************/
479
480 static NTSTATUS kerberos_return_pac_logon_info(TALLOC_CTX *mem_ctx,
481 const char *name,
482 const char *pass,
483 time_t time_offset,
484 time_t *expire_time,
485 time_t *renew_till_time,
486 const char *cache_name,
487 bool request_pac,
488 bool add_netbios_addr,
489 time_t renewable_time,
490 struct PAC_LOGON_INFO **logon_info)
491 {
492 NTSTATUS status;
493 struct PAC_DATA *pac_data = NULL;
494 struct PAC_LOGON_INFO *info = NULL;
495
496 status = kerberos_return_pac(mem_ctx,
497 name,
498 pass,
499 time_offset,
500 expire_time,
501 renew_till_time,
502 cache_name,
503 request_pac,
504 add_netbios_addr,
505 renewable_time,
506 &pac_data);
507 if (!NT_STATUS_IS_OK(status)) {
508 return status;
509 }
510
511 if (!pac_data) {
512 DEBUG(3,("no pac\n"));
513 return NT_STATUS_INVALID_USER_BUFFER;
514 }
515
516 info = get_logon_info_from_pac(pac_data);
517 if (!info) {
518 DEBUG(1,("no logon_info\n"));
519 return NT_STATUS_INVALID_USER_BUFFER;
520 }
521
522 *logon_info = info;
523
524 return NT_STATUS_OK;
525 }
526
527 /****************************************************************
528 ****************************************************************/
529
530 NTSTATUS kerberos_return_info3_from_pac(TALLOC_CTX *mem_ctx,
531 const char *name,
532 const char *pass,
533 time_t time_offset,
534 time_t *expire_time,
535 time_t *renew_till_time,
536 const char *cache_name,
537 bool request_pac,
538 bool add_netbios_addr,
539 time_t renewable_time,
540 struct netr_SamInfo3 **info3)
541 {
542 NTSTATUS status;
543 struct PAC_LOGON_INFO *logon_info = NULL;
544
545 status = kerberos_return_pac_logon_info(mem_ctx,
546 name,
547 pass,
548 time_offset,
549 expire_time,
550 renew_till_time,
551 cache_name,
552 request_pac,
553 add_netbios_addr,
554 renewable_time,
555 &logon_info);
556 if (!NT_STATUS_IS_OK(status)) {
557 return status;
558 }
559
560 *info3 = &logon_info->info3;
561
562 return NT_STATUS_OK;
563 }
564 #endif
stuff from bjacke