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ctdb/docs: Include ceph rados namespace support in man page
[Samba.git] / source4 / auth / kerberos / kerberos_pac.c
blobc33dc2f9217d61b0c9db63d4c0b27d5309f78704
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 #include "auth/credentials/credentials.h"
34 #include "auth/kerberos/kerberos_util.h"
35 #include "auth/kerberos/pac_utils.h"
36
37 krb5_error_code kerberos_encode_pac(TALLOC_CTX *mem_ctx,
38 struct PAC_DATA *pac_data,
39 krb5_context context,
40 const krb5_keyblock *krbtgt_keyblock,
41 const krb5_keyblock *service_keyblock,
42 DATA_BLOB *pac)
43 {
44 NTSTATUS nt_status;
45 krb5_error_code ret;
46 enum ndr_err_code ndr_err;
47 DATA_BLOB zero_blob = data_blob(NULL, 0);
48 DATA_BLOB tmp_blob = data_blob(NULL, 0);
49 struct PAC_SIGNATURE_DATA *kdc_checksum = NULL;
50 struct PAC_SIGNATURE_DATA *srv_checksum = NULL;
51 uint32_t i;
52
53 /* First, just get the keytypes filled in (and lengths right, eventually) */
54 for (i=0; i < pac_data->num_buffers; i++) {
55 if (pac_data->buffers[i].type != PAC_TYPE_KDC_CHECKSUM) {
56 continue;
57 }
58 kdc_checksum = &pac_data->buffers[i].info->kdc_cksum,
59 ret = smb_krb5_make_pac_checksum(mem_ctx,
60 &zero_blob,
61 context,
62 krbtgt_keyblock,
63 &kdc_checksum->type,
64 &kdc_checksum->signature);
65 if (ret) {
66 DEBUG(2, ("making krbtgt PAC checksum failed: %s\n",
67 smb_get_krb5_error_message(context, ret, mem_ctx)));
68 talloc_free(pac_data);
69 return ret;
70 }
71 }
72
73 for (i=0; i < pac_data->num_buffers; i++) {
74 if (pac_data->buffers[i].type != PAC_TYPE_SRV_CHECKSUM) {
75 continue;
76 }
77 srv_checksum = &pac_data->buffers[i].info->srv_cksum;
78 ret = smb_krb5_make_pac_checksum(mem_ctx,
79 &zero_blob,
80 context,
81 service_keyblock,
82 &srv_checksum->type,
83 &srv_checksum->signature);
84 if (ret) {
85 DEBUG(2, ("making service PAC checksum failed: %s\n",
86 smb_get_krb5_error_message(context, ret, mem_ctx)));
87 talloc_free(pac_data);
88 return ret;
89 }
90 }
91
92 if (!kdc_checksum) {
93 DEBUG(2, ("Invalid PAC constructed for signing, no KDC checksum present!\n"));
94 return EINVAL;
95 }
96 if (!srv_checksum) {
97 DEBUG(2, ("Invalid PAC constructed for signing, no SRV checksum present!\n"));
98 return EINVAL;
99 }
100
101 /* But wipe out the actual signatures */
102 memset(kdc_checksum->signature.data, '\0', kdc_checksum->signature.length);
103 memset(srv_checksum->signature.data, '\0', srv_checksum->signature.length);
104
105 ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
106 pac_data,
107 (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
108 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
109 nt_status = ndr_map_error2ntstatus(ndr_err);
110 DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
111 talloc_free(pac_data);
112 return EINVAL;
113 }
114
115 /* Then sign the result of the previous push, where the sig was zero'ed out */
116 ret = smb_krb5_make_pac_checksum(mem_ctx,
117 &tmp_blob,
118 context,
119 service_keyblock,
120 &srv_checksum->type,
121 &srv_checksum->signature);
122
123 if (ret) {
124 DBG_WARNING("making krbtgt PAC srv_checksum failed: %s\n",
125 smb_get_krb5_error_message(context, ret, mem_ctx));
126 talloc_free(pac_data);
127 return ret;
128 }
129
130 /* Then sign Server checksum */
131 ret = smb_krb5_make_pac_checksum(mem_ctx,
132 &srv_checksum->signature,
133 context,
134 krbtgt_keyblock,
135 &kdc_checksum->type,
136 &kdc_checksum->signature);
137 if (ret) {
138 DBG_WARNING("making krbtgt PAC kdc_checksum failed: %s\n",
139 smb_get_krb5_error_message(context, ret, mem_ctx));
140 talloc_free(pac_data);
141 return ret;
142 }
143
144 /* And push it out again, this time to the world. This relies on deterministic pointer values */
145 ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx,
146 pac_data,
147 (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
148 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
149 nt_status = ndr_map_error2ntstatus(ndr_err);
150 DEBUG(1, ("PAC (final) push failed: %s\n", nt_errstr(nt_status)));
151 talloc_free(pac_data);
152 return EINVAL;
153 }
154
155 *pac = tmp_blob;
156
157 return ret;
158 }
159
160
161 krb5_error_code kerberos_create_pac(TALLOC_CTX *mem_ctx,
162 struct auth_user_info_dc *user_info_dc,
163 krb5_context context,
164 const krb5_keyblock *krbtgt_keyblock,
165 const krb5_keyblock *service_keyblock,
166 krb5_principal client_principal,
167 time_t tgs_authtime,
168 DATA_BLOB *pac)
169 {
170 NTSTATUS nt_status;
171 krb5_error_code ret;
172 struct PAC_DATA *pac_data = talloc(mem_ctx, struct PAC_DATA);
173 struct netr_SamInfo3 *sam3;
174 union PAC_INFO *u_LOGON_INFO;
175 struct PAC_LOGON_INFO *LOGON_INFO;
176 union PAC_INFO *u_LOGON_NAME;
177 struct PAC_LOGON_NAME *LOGON_NAME;
178 union PAC_INFO *u_KDC_CHECKSUM;
179 union PAC_INFO *u_SRV_CHECKSUM;
180
181 char *name;
182
183 enum {
184 PAC_BUF_LOGON_INFO = 0,
185 PAC_BUF_LOGON_NAME = 1,
186 PAC_BUF_SRV_CHECKSUM = 2,
187 PAC_BUF_KDC_CHECKSUM = 3,
188 PAC_BUF_NUM_BUFFERS = 4
189 };
190
191 if (!pac_data) {
192 return ENOMEM;
193 }
194
195 pac_data->num_buffers = PAC_BUF_NUM_BUFFERS;
196 pac_data->version = 0;
197
198 pac_data->buffers = talloc_array(pac_data,
199 struct PAC_BUFFER,
200 pac_data->num_buffers);
201 if (!pac_data->buffers) {
202 talloc_free(pac_data);
203 return ENOMEM;
204 }
205
206 /* LOGON_INFO */
207 u_LOGON_INFO = talloc_zero(pac_data->buffers, union PAC_INFO);
208 if (!u_LOGON_INFO) {
209 talloc_free(pac_data);
210 return ENOMEM;
211 }
212 pac_data->buffers[PAC_BUF_LOGON_INFO].type = PAC_TYPE_LOGON_INFO;
213 pac_data->buffers[PAC_BUF_LOGON_INFO].info = u_LOGON_INFO;
214
215 /* LOGON_NAME */
216 u_LOGON_NAME = talloc_zero(pac_data->buffers, union PAC_INFO);
217 if (!u_LOGON_NAME) {
218 talloc_free(pac_data);
219 return ENOMEM;
220 }
221 pac_data->buffers[PAC_BUF_LOGON_NAME].type = PAC_TYPE_LOGON_NAME;
222 pac_data->buffers[PAC_BUF_LOGON_NAME].info = u_LOGON_NAME;
223 LOGON_NAME = &u_LOGON_NAME->logon_name;
224
225 /* SRV_CHECKSUM */
226 u_SRV_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
227 if (!u_SRV_CHECKSUM) {
228 talloc_free(pac_data);
229 return ENOMEM;
230 }
231 pac_data->buffers[PAC_BUF_SRV_CHECKSUM].type = PAC_TYPE_SRV_CHECKSUM;
232 pac_data->buffers[PAC_BUF_SRV_CHECKSUM].info = u_SRV_CHECKSUM;
233
234 /* KDC_CHECKSUM */
235 u_KDC_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO);
236 if (!u_KDC_CHECKSUM) {
237 talloc_free(pac_data);
238 return ENOMEM;
239 }
240 pac_data->buffers[PAC_BUF_KDC_CHECKSUM].type = PAC_TYPE_KDC_CHECKSUM;
241 pac_data->buffers[PAC_BUF_KDC_CHECKSUM].info = u_KDC_CHECKSUM;
242
243 /* now the real work begins... */
244
245 LOGON_INFO = talloc_zero(u_LOGON_INFO, struct PAC_LOGON_INFO);
246 if (!LOGON_INFO) {
247 talloc_free(pac_data);
248 return ENOMEM;
249 }
250 nt_status = auth_convert_user_info_dc_saminfo3(LOGON_INFO, user_info_dc,
251 AUTH_INCLUDE_RESOURCE_GROUPS,
252 &sam3, NULL);
253 if (!NT_STATUS_IS_OK(nt_status)) {
254 DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
255 talloc_free(pac_data);
256 return EINVAL;
257 }
258
259 u_LOGON_INFO->logon_info.info = LOGON_INFO;
260 LOGON_INFO->info3 = *sam3;
261
262 ret = krb5_unparse_name_flags(context, client_principal,
263 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
264 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
265 &name);
266 if (ret) {
267 return ret;
268 }
269 LOGON_NAME->account_name = talloc_strdup(LOGON_NAME, name);
270 free(name);
271 /*
272 this logon_time field is absolutely critical. This is what
273 caused all our PAC troubles :-)
274 */
275 unix_to_nt_time(&LOGON_NAME->logon_time, tgs_authtime);
276
277 ret = kerberos_encode_pac(mem_ctx,
278 pac_data,
279 context,
280 krbtgt_keyblock,
281 service_keyblock,
282 pac);
283 talloc_free(pac_data);
284 return ret;
285 }
286
287 static krb5_error_code kerberos_pac_buffer_present(krb5_context context,
288 const krb5_const_pac pac,
289 uint32_t type)
290 {
291 #ifdef SAMBA4_USES_HEIMDAL
292 return krb5_pac_get_buffer(context, pac, type, NULL);
293 #else /* MIT */
294 krb5_error_code ret;
295 krb5_data data;
296
297 /*
298 * MIT won't let us pass NULL for the data parameter, so we are forced
299 * to allocate a new buffer and then immediately free it.
300 */
301 ret = krb5_pac_get_buffer(context, pac, type, &data);
302 if (ret == 0) {
303 krb5_free_data_contents(context, &data);
304 }
305 return ret;
306 #endif /* SAMBA4_USES_HEIMDAL */
307 }
308
309 krb5_error_code kerberos_pac_to_user_info_dc(TALLOC_CTX *mem_ctx,
310 krb5_const_pac pac,
311 krb5_context context,
312 struct auth_user_info_dc **user_info_dc,
313 const enum auth_group_inclusion group_inclusion,
314 struct PAC_SIGNATURE_DATA *pac_srv_sig,
315 struct PAC_SIGNATURE_DATA *pac_kdc_sig,
316 struct PAC_DOMAIN_GROUP_MEMBERSHIP **resource_groups)
317 {
318 NTSTATUS nt_status;
319 enum ndr_err_code ndr_err;
320 krb5_error_code ret;
321
322 DATA_BLOB pac_logon_info_in, pac_srv_checksum_in, pac_kdc_checksum_in;
323 krb5_data k5pac_logon_info_in, k5pac_srv_checksum_in, k5pac_kdc_checksum_in;
324 DATA_BLOB pac_upn_dns_info_in;
325 krb5_data k5pac_upn_dns_info_in;
326
327 union PAC_INFO info;
328 union PAC_INFO _upn_dns_info;
329 struct PAC_UPN_DNS_INFO *upn_dns_info = NULL;
330 struct auth_user_info_dc *user_info_dc_out;
331 const struct PAC_DOMAIN_GROUP_MEMBERSHIP *resource_groups_in = NULL;
332 struct PAC_DOMAIN_GROUP_MEMBERSHIP *resource_groups_out = NULL;
333
334 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
335
336 if (!tmp_ctx) {
337 return ENOMEM;
338 }
339
340 if (pac == NULL) {
341 talloc_free(tmp_ctx);
342 return EINVAL;
343 }
344
345 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_LOGON_INFO, &k5pac_logon_info_in);
346 if (ret != 0) {
347 talloc_free(tmp_ctx);
348 return EINVAL;
349 }
350
351 pac_logon_info_in = data_blob_const(k5pac_logon_info_in.data, k5pac_logon_info_in.length);
352
353 ndr_err = ndr_pull_union_blob(&pac_logon_info_in, tmp_ctx, &info,
354 PAC_TYPE_LOGON_INFO,
355 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
356 smb_krb5_free_data_contents(context, &k5pac_logon_info_in);
357 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
358 nt_status = ndr_map_error2ntstatus(ndr_err);
359 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
360 talloc_free(tmp_ctx);
361 return EINVAL;
362 }
363 if (info.logon_info.info == NULL) {
364 DEBUG(0,("can't parse the PAC LOGON_INFO: missing info pointer\n"));
365 talloc_free(tmp_ctx);
366 return EINVAL;
367 }
368
369 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_UPN_DNS_INFO,
370 &k5pac_upn_dns_info_in);
371 if (ret == ENOENT) {
372 ZERO_STRUCT(k5pac_upn_dns_info_in);
373 ret = 0;
374 }
375 if (ret != 0) {
376 talloc_free(tmp_ctx);
377 return EINVAL;
378 }
379
380 pac_upn_dns_info_in = data_blob_const(k5pac_upn_dns_info_in.data,
381 k5pac_upn_dns_info_in.length);
382
383 if (pac_upn_dns_info_in.length != 0) {
384 ndr_err = ndr_pull_union_blob(&pac_upn_dns_info_in, tmp_ctx,
385 &_upn_dns_info,
386 PAC_TYPE_UPN_DNS_INFO,
387 (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
388 smb_krb5_free_data_contents(context, &k5pac_upn_dns_info_in);
389 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
390 nt_status = ndr_map_error2ntstatus(ndr_err);
391 DEBUG(0,("can't parse the PAC UPN_DNS_INFO: %s\n",
392 nt_errstr(nt_status)));
393 talloc_free(tmp_ctx);
394 return EINVAL;
395 }
396 upn_dns_info = &_upn_dns_info.upn_dns_info;
397 }
398
399 /* Pull this right into the normal auth system structures */
400 nt_status = make_user_info_dc_pac(tmp_ctx,
401 info.logon_info.info,
402 upn_dns_info,
403 group_inclusion,
404 &user_info_dc_out);
405 if (!NT_STATUS_IS_OK(nt_status)) {
406 DBG_ERR("make_user_info_dc_pac() failed - %s\n",
407 nt_errstr(nt_status));
408 NDR_PRINT_DEBUG(PAC_LOGON_INFO, info.logon_info.info);
409 if (upn_dns_info != NULL) {
410 NDR_PRINT_DEBUG(PAC_UPN_DNS_INFO, upn_dns_info);
411 }
412 talloc_free(tmp_ctx);
413 return EINVAL;
414 }
415
416 if (pac_srv_sig) {
417 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_SRV_CHECKSUM, &k5pac_srv_checksum_in);
418 if (ret != 0) {
419 talloc_free(tmp_ctx);
420 return ret;
421 }
422
423 pac_srv_checksum_in = data_blob_const(k5pac_srv_checksum_in.data, k5pac_srv_checksum_in.length);
424
425 ndr_err = ndr_pull_struct_blob(&pac_srv_checksum_in, pac_srv_sig,
426 pac_srv_sig,
427 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
428 smb_krb5_free_data_contents(context, &k5pac_srv_checksum_in);
429 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
430 nt_status = ndr_map_error2ntstatus(ndr_err);
431 DEBUG(0,("can't parse the server signature: %s\n",
432 nt_errstr(nt_status)));
433 return EINVAL;
434 }
435 }
436
437 if (pac_kdc_sig) {
438 ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_KDC_CHECKSUM, &k5pac_kdc_checksum_in);
439 if (ret != 0) {
440 talloc_free(tmp_ctx);
441 return ret;
442 }
443
444 pac_kdc_checksum_in = data_blob_const(k5pac_kdc_checksum_in.data, k5pac_kdc_checksum_in.length);
445
446 ndr_err = ndr_pull_struct_blob(&pac_kdc_checksum_in, pac_kdc_sig,
447 pac_kdc_sig,
448 (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
449 smb_krb5_free_data_contents(context, &k5pac_kdc_checksum_in);
450 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
451 nt_status = ndr_map_error2ntstatus(ndr_err);
452 DEBUG(0,("can't parse the KDC signature: %s\n",
453 nt_errstr(nt_status)));
454 return EINVAL;
455 }
456 }
457
458 /*
459 * Based on the presence of a REQUESTER_SID PAC buffer, ascertain
460 * whether the ticket is a TGT. This helps the KDC and kpasswd service
461 * ensure they do not accept tickets meant for the other.
462 *
463 * This heuristic will fail for older Samba versions and Windows prior
464 * to Nov. 2021 updates, which lack support for the REQUESTER_SID PAC
465 * buffer.
466 */
467 ret = kerberos_pac_buffer_present(context, pac, PAC_TYPE_REQUESTER_SID);
468 if (ret == ENOENT) {
469 /* This probably isn't a TGT. */
470 user_info_dc_out->ticket_type = TICKET_TYPE_NON_TGT;
471 } else if (ret != 0) {
472 talloc_free(tmp_ctx);
473 return ret;
474 } else {
475 /* This probably is a TGT. */
476 user_info_dc_out->ticket_type = TICKET_TYPE_TGT;
477 }
478
479 /*
480 * If we have resource groups and the caller wants them returned, we
481 * oblige.
482 */
483 resource_groups_in = &info.logon_info.info->resource_groups;
484 if (resource_groups != NULL && resource_groups_in->groups.count != 0) {
485 resource_groups_out = talloc(tmp_ctx, struct PAC_DOMAIN_GROUP_MEMBERSHIP);
486 if (resource_groups_out == NULL) {
487 talloc_free(tmp_ctx);
488 return ENOMEM;
489 }
490
491 *resource_groups_out = (struct PAC_DOMAIN_GROUP_MEMBERSHIP) {
492 .domain_sid = talloc_steal(resource_groups_out, resource_groups_in->domain_sid),
493 .groups = {
494 .count = resource_groups_in->groups.count,
495 .rids = talloc_steal(resource_groups_out, resource_groups_in->groups.rids),
496 },
497 };
498 }
499
500 *user_info_dc = talloc_steal(mem_ctx, user_info_dc_out);
501 if (resource_groups_out != NULL) {
502 *resource_groups = talloc_steal(mem_ctx, resource_groups_out);
503 }
504
505 return 0;
506 }
507
508
509 NTSTATUS kerberos_pac_blob_to_user_info_dc(TALLOC_CTX *mem_ctx,
510 DATA_BLOB pac_blob,
511 krb5_context context,
512 struct auth_user_info_dc **user_info_dc,
513 struct PAC_SIGNATURE_DATA *pac_srv_sig,
514 struct PAC_SIGNATURE_DATA *pac_kdc_sig)
515 {
516 krb5_error_code ret;
517 krb5_pac pac;
518 ret = krb5_pac_parse(context,
519 pac_blob.data, pac_blob.length,
520 &pac);
521 if (ret) {
522 return map_nt_error_from_unix_common(ret);
523 }
524
525
526 ret = kerberos_pac_to_user_info_dc(mem_ctx,
527 pac,
528 context,
529 user_info_dc,
530 AUTH_INCLUDE_RESOURCE_GROUPS,
531 pac_srv_sig,
532 pac_kdc_sig,
533 NULL);
534 krb5_pac_free(context, pac);
535 if (ret) {
536 return map_nt_error_from_unix_common(ret);
537 }
538 return NT_STATUS_OK;
539 }
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