Line data Source code
1 : /*
2 : MIT-Samba4 library
3 :
4 : Copyright (c) 2010, Simo Sorce <idra@samba.org>
5 : Copyright (c) 2014-2015 Guenther Deschner <gd@samba.org>
6 : Copyright (c) 2014-2016 Andreas Schneider <asn@samba.org>
7 :
8 : This program is free software; you can redistribute it and/or modify
9 : it under the terms of the GNU General Public License as published by
10 : the Free Software Foundation; either version 3 of the License, or
11 : (at your option) any later version.
12 :
13 : This program is distributed in the hope that it will be useful,
14 : but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 : GNU General Public License for more details.
17 :
18 : You should have received a copy of the GNU General Public License
19 : along with this program. If not, see <http://www.gnu.org/licenses/>.
20 : */
21 :
22 : #define TEVENT_DEPRECATED 1
23 :
24 : #include "includes.h"
25 : #include "param/param.h"
26 : #include "dsdb/samdb/samdb.h"
27 : #include "system/kerberos.h"
28 : #include <com_err.h>
29 : #include <kdb.h>
30 : #include <kadm5/kadm_err.h>
31 : #include "kdc/sdb.h"
32 : #include "kdc/sdb_kdb.h"
33 : #include "auth/kerberos/kerberos.h"
34 : #include "auth/kerberos/pac_utils.h"
35 : #include "kdc/samba_kdc.h"
36 : #include "kdc/pac-glue.h"
37 : #include "kdc/db-glue.h"
38 : #include "auth/auth.h"
39 : #include "kdc/kpasswd_glue.h"
40 : #include "auth/auth_sam.h"
41 :
42 : #include "mit_samba.h"
43 :
44 : #undef DBGC_CLASS
45 : #define DBGC_CLASS DBGC_KERBEROS
46 :
47 12 : void mit_samba_context_free(struct mit_samba_context *ctx)
48 : {
49 : /* free heimdal's krb5_context */
50 12 : if (ctx->context) {
51 12 : krb5_free_context(ctx->context);
52 : }
53 :
54 : /* then free everything else */
55 12 : talloc_free(ctx);
56 12 : }
57 :
58 : /*
59 : * Implemant a callback to log to the MIT KDC log facility
60 : *
61 : * http://web.mit.edu/kerberos/krb5-devel/doc/plugindev/general.html#logging-from-kdc-and-kadmind-plugin-modules
62 : */
63 40 : static void mit_samba_debug(void *private_ptr, int msg_level, const char *msg)
64 : {
65 40 : int is_error = errno;
66 :
67 40 : if (msg_level > 0) {
68 4 : is_error = 0;
69 : }
70 :
71 40 : com_err("", is_error, "%s", msg);
72 40 : }
73 :
74 12 : int mit_samba_context_init(struct mit_samba_context **_ctx)
75 : {
76 : NTSTATUS status;
77 : struct mit_samba_context *ctx;
78 : const char *s4_conf_file;
79 : int ret;
80 : struct samba_kdc_base_context base_ctx;
81 :
82 12 : ctx = talloc_zero(NULL, struct mit_samba_context);
83 12 : if (!ctx) {
84 0 : ret = ENOMEM;
85 0 : goto done;
86 : }
87 :
88 12 : base_ctx.ev_ctx = tevent_context_init(ctx);
89 12 : if (!base_ctx.ev_ctx) {
90 0 : ret = ENOMEM;
91 0 : goto done;
92 : }
93 12 : tevent_loop_allow_nesting(base_ctx.ev_ctx);
94 12 : base_ctx.lp_ctx = loadparm_init_global(false);
95 12 : if (!base_ctx.lp_ctx) {
96 0 : ret = ENOMEM;
97 0 : goto done;
98 : }
99 :
100 12 : debug_set_callback(NULL, mit_samba_debug);
101 :
102 : /* init s4 configuration */
103 12 : s4_conf_file = lpcfg_configfile(base_ctx.lp_ctx);
104 12 : if (s4_conf_file != NULL) {
105 12 : char *p = talloc_strdup(ctx, s4_conf_file);
106 12 : if (p == NULL) {
107 0 : ret = ENOMEM;
108 0 : goto done;
109 : }
110 12 : lpcfg_load(base_ctx.lp_ctx, p);
111 12 : TALLOC_FREE(p);
112 : } else {
113 0 : lpcfg_load_default(base_ctx.lp_ctx);
114 : }
115 :
116 12 : status = samba_kdc_setup_db_ctx(ctx, &base_ctx, &ctx->db_ctx);
117 12 : if (!NT_STATUS_IS_OK(status)) {
118 0 : ret = EINVAL;
119 0 : goto done;
120 : }
121 :
122 : /* init heimdal's krb_context and log facilities */
123 12 : ret = smb_krb5_init_context_basic(ctx,
124 12 : ctx->db_ctx->lp_ctx,
125 : &ctx->context);
126 12 : if (ret) {
127 0 : goto done;
128 : }
129 :
130 12 : ret = 0;
131 :
132 12 : done:
133 12 : if (ret) {
134 0 : mit_samba_context_free(ctx);
135 : } else {
136 12 : *_ctx = ctx;
137 : }
138 12 : return ret;
139 : }
140 :
141 0 : static krb5_error_code ks_is_tgs_principal(struct mit_samba_context *ctx,
142 : krb5_const_principal principal)
143 : {
144 : char *p;
145 0 : int eq = -1;
146 :
147 0 : p = smb_krb5_principal_get_comp_string(ctx, ctx->context, principal, 0);
148 :
149 0 : eq = krb5_princ_size(ctx->context, principal) == 2 &&
150 0 : (strcmp(p, KRB5_TGS_NAME) == 0);
151 :
152 0 : talloc_free(p);
153 :
154 0 : return eq;
155 : }
156 :
157 0 : int mit_samba_generate_salt(krb5_data *salt)
158 : {
159 0 : if (salt == NULL) {
160 0 : return EINVAL;
161 : }
162 :
163 0 : salt->length = 16;
164 0 : salt->data = malloc(salt->length);
165 0 : if (salt->data == NULL) {
166 0 : return ENOMEM;
167 : }
168 :
169 0 : generate_random_buffer((uint8_t *)salt->data, salt->length);
170 :
171 0 : return 0;
172 : }
173 :
174 0 : int mit_samba_generate_random_password(krb5_data *pwd)
175 : {
176 : TALLOC_CTX *tmp_ctx;
177 : char *password;
178 :
179 0 : if (pwd == NULL) {
180 0 : return EINVAL;
181 : }
182 0 : pwd->length = 24;
183 :
184 0 : tmp_ctx = talloc_named(NULL,
185 : 0,
186 : "mit_samba_create_principal_password context");
187 0 : if (tmp_ctx == NULL) {
188 0 : return ENOMEM;
189 : }
190 :
191 0 : password = generate_random_password(tmp_ctx, pwd->length, pwd->length);
192 0 : if (password == NULL) {
193 0 : talloc_free(tmp_ctx);
194 0 : return ENOMEM;
195 : }
196 :
197 0 : pwd->data = strdup(password);
198 0 : talloc_free(tmp_ctx);
199 0 : if (pwd->data == NULL) {
200 0 : return ENOMEM;
201 : }
202 :
203 0 : return 0;
204 : }
205 :
206 12 : int mit_samba_get_principal(struct mit_samba_context *ctx,
207 : krb5_const_principal principal,
208 : unsigned int kflags,
209 : krb5_db_entry **_kentry)
210 : {
211 12 : struct sdb_entry sentry = {};
212 : krb5_db_entry *kentry;
213 : int ret;
214 12 : uint32_t sflags = 0;
215 12 : krb5_principal referral_principal = NULL;
216 :
217 12 : kentry = calloc(1, sizeof(krb5_db_entry));
218 12 : if (kentry == NULL) {
219 0 : return ENOMEM;
220 : }
221 :
222 : #if KRB5_KDB_API_VERSION >= 10
223 : /*
224 : * The MIT KDC code that wants the canonical name in all lookups, and
225 : * takes care to canonicalize only when appropriate.
226 : */
227 12 : sflags |= SDB_F_FORCE_CANON;
228 : #endif
229 :
230 : #if KRB5_KDB_DAL_MAJOR_VERSION >= 9
231 : if (kflags & KRB5_KDB_FLAG_REFERRAL_OK) {
232 : sflags |= SDB_F_CANON;
233 : }
234 :
235 : if (kflags & KRB5_KDB_FLAG_CLIENT) {
236 : sflags |= SDB_F_GET_CLIENT;
237 : sflags |= SDB_F_FOR_AS_REQ;
238 : } else {
239 : int equal = smb_krb5_principal_is_tgs(ctx->context, principal);
240 : if (equal == -1) {
241 : return ENOMEM;
242 : }
243 :
244 : if (equal) {
245 : sflags |= SDB_F_GET_KRBTGT;
246 : } else {
247 : sflags |= SDB_F_GET_SERVER;
248 : sflags |= SDB_F_FOR_TGS_REQ;
249 : }
250 : }
251 : #else /* KRB5_KDB_DAL_MAJOR_VERSION < 9 */
252 12 : if (kflags & KRB5_KDB_FLAG_CANONICALIZE) {
253 0 : sflags |= SDB_F_CANON;
254 : }
255 12 : if (kflags & (KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY |
256 : KRB5_KDB_FLAG_INCLUDE_PAC)) {
257 : /*
258 : * KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY is equal to
259 : * SDB_F_FOR_AS_REQ
260 : *
261 : * We use ANY to also allow AS_REQ for service principal names
262 : * This is supported by Windows.
263 : */
264 0 : sflags |= SDB_F_GET_ANY|SDB_F_FOR_AS_REQ;
265 : } else {
266 12 : int equal = smb_krb5_principal_is_tgs(ctx->context, principal);
267 12 : if (equal == -1) {
268 0 : return ENOMEM;
269 : }
270 :
271 12 : if (equal) {
272 0 : sflags |= SDB_F_GET_KRBTGT;
273 : } else {
274 12 : sflags |= SDB_F_GET_SERVER|SDB_F_FOR_TGS_REQ;
275 : }
276 : }
277 : #endif /* KRB5_KDB_DAL_MAJOR_VERSION */
278 :
279 : /* always set this or the created_by data will not be populated by samba's
280 : * backend and we will fail to parse the entry later */
281 12 : sflags |= SDB_F_ADMIN_DATA;
282 :
283 :
284 12 : fetch_referral_principal:
285 12 : ret = samba_kdc_fetch(ctx->context, ctx->db_ctx,
286 : principal, sflags, 0, &sentry);
287 12 : switch (ret) {
288 12 : case 0:
289 12 : break;
290 0 : case SDB_ERR_NOENTRY:
291 0 : ret = KRB5_KDB_NOENTRY;
292 0 : goto done;
293 0 : case SDB_ERR_WRONG_REALM: {
294 0 : char *dest_realm = NULL;
295 0 : const char *our_realm = lpcfg_realm(ctx->db_ctx->lp_ctx);
296 :
297 0 : if (sflags & SDB_F_FOR_AS_REQ) {
298 : /*
299 : * If this is a request for a TGT, we are done. The KDC
300 : * will return the correct error to the client.
301 : */
302 0 : ret = 0;
303 0 : break;
304 : }
305 :
306 0 : if (referral_principal != NULL) {
307 0 : sdb_entry_free(&sentry);
308 0 : ret = KRB5_KDB_NOENTRY;
309 0 : goto done;
310 : }
311 :
312 : /*
313 : * We get a TGS request
314 : *
315 : * cifs/dc7.SAMBA2008R2.EXAMPLE.COM@ADDOM.SAMBA.EXAMPLE.COM
316 : *
317 : * to our DC for the realm
318 : *
319 : * ADDOM.SAMBA.EXAMPLE.COM
320 : *
321 : * We look up if we have and entry in the database and get an
322 : * entry with the pricipal:
323 : *
324 : * cifs/dc7.SAMBA2008R2.EXAMPLE.COM@SAMBA2008R2.EXAMPLE.COM
325 : *
326 : * and the error: SDB_ERR_WRONG_REALM.
327 : *
328 : * In the case of a TGS-REQ we need to return a referral ticket
329 : * fo the next trust hop to the client. This ticket will have
330 : * the following principal:
331 : *
332 : * krbtgt/SAMBA2008R2.EXAMPLE.COM@ADDOM.SAMBA.EXAMPLE.COM
333 : *
334 : * We just redo the lookup in the database with the referral
335 : * principal and return success.
336 : */
337 0 : dest_realm = smb_krb5_principal_get_realm(
338 0 : ctx, ctx->context, sentry.principal);
339 0 : sdb_entry_free(&sentry);
340 0 : if (dest_realm == NULL) {
341 0 : ret = KRB5_KDB_NOENTRY;
342 0 : goto done;
343 : }
344 :
345 0 : ret = smb_krb5_make_principal(ctx->context,
346 : &referral_principal,
347 : our_realm,
348 : KRB5_TGS_NAME,
349 : dest_realm,
350 : NULL);
351 0 : TALLOC_FREE(dest_realm);
352 0 : if (ret != 0) {
353 0 : goto done;
354 : }
355 :
356 0 : principal = referral_principal;
357 0 : goto fetch_referral_principal;
358 : }
359 0 : case SDB_ERR_NOT_FOUND_HERE:
360 : /* FIXME: RODC support */
361 : default:
362 0 : goto done;
363 : }
364 :
365 12 : ret = sdb_entry_to_krb5_db_entry(ctx->context, &sentry, kentry);
366 :
367 12 : sdb_entry_free(&sentry);
368 :
369 12 : done:
370 12 : krb5_free_principal(ctx->context, referral_principal);
371 12 : referral_principal = NULL;
372 :
373 12 : if (ret) {
374 0 : free(kentry);
375 : } else {
376 12 : *_kentry = kentry;
377 : }
378 12 : return ret;
379 : }
380 :
381 0 : int mit_samba_get_firstkey(struct mit_samba_context *ctx,
382 : krb5_db_entry **_kentry)
383 : {
384 0 : struct sdb_entry sentry = {};
385 : krb5_db_entry *kentry;
386 : int ret;
387 :
388 0 : kentry = malloc(sizeof(krb5_db_entry));
389 0 : if (kentry == NULL) {
390 0 : return ENOMEM;
391 : }
392 :
393 0 : ret = samba_kdc_firstkey(ctx->context, ctx->db_ctx, &sentry);
394 0 : switch (ret) {
395 0 : case 0:
396 0 : break;
397 0 : case SDB_ERR_NOENTRY:
398 0 : free(kentry);
399 0 : return KRB5_KDB_NOENTRY;
400 0 : case SDB_ERR_NOT_FOUND_HERE:
401 : /* FIXME: RODC support */
402 : default:
403 0 : free(kentry);
404 0 : return ret;
405 : }
406 :
407 0 : ret = sdb_entry_to_krb5_db_entry(ctx->context, &sentry, kentry);
408 :
409 0 : sdb_entry_free(&sentry);
410 :
411 0 : if (ret) {
412 0 : free(kentry);
413 : } else {
414 0 : *_kentry = kentry;
415 : }
416 0 : return ret;
417 : }
418 :
419 0 : int mit_samba_get_nextkey(struct mit_samba_context *ctx,
420 : krb5_db_entry **_kentry)
421 : {
422 0 : struct sdb_entry sentry = {};
423 : krb5_db_entry *kentry;
424 : int ret;
425 :
426 0 : kentry = malloc(sizeof(krb5_db_entry));
427 0 : if (kentry == NULL) {
428 0 : return ENOMEM;
429 : }
430 :
431 0 : ret = samba_kdc_nextkey(ctx->context, ctx->db_ctx, &sentry);
432 0 : switch (ret) {
433 0 : case 0:
434 0 : break;
435 0 : case SDB_ERR_NOENTRY:
436 0 : free(kentry);
437 0 : return KRB5_KDB_NOENTRY;
438 0 : case SDB_ERR_NOT_FOUND_HERE:
439 : /* FIXME: RODC support */
440 : default:
441 0 : free(kentry);
442 0 : return ret;
443 : }
444 :
445 0 : ret = sdb_entry_to_krb5_db_entry(ctx->context, &sentry, kentry);
446 :
447 0 : sdb_entry_free(&sentry);
448 :
449 0 : if (ret) {
450 0 : free(kentry);
451 : } else {
452 0 : *_kentry = kentry;
453 : }
454 0 : return ret;
455 : }
456 :
457 0 : int mit_samba_get_pac(struct mit_samba_context *smb_ctx,
458 : krb5_context context,
459 : uint32_t flags,
460 : krb5_db_entry *client,
461 : krb5_db_entry *server,
462 : krb5_keyblock *replaced_reply_key,
463 : krb5_pac *pac)
464 : {
465 : TALLOC_CTX *tmp_ctx;
466 0 : DATA_BLOB *logon_info_blob = NULL;
467 0 : DATA_BLOB *upn_dns_info_blob = NULL;
468 0 : DATA_BLOB *cred_ndr = NULL;
469 0 : DATA_BLOB **cred_ndr_ptr = NULL;
470 0 : DATA_BLOB cred_blob = data_blob_null;
471 0 : DATA_BLOB *pcred_blob = NULL;
472 0 : DATA_BLOB *pac_attrs_blob = NULL;
473 0 : DATA_BLOB *requester_sid_blob = NULL;
474 : NTSTATUS nt_status;
475 : krb5_error_code code;
476 : struct samba_kdc_entry *skdc_entry;
477 : bool is_krbtgt;
478 0 : enum samba_asserted_identity asserted_identity =
479 0 : (flags & KRB5_KDB_FLAG_PROTOCOL_TRANSITION) ?
480 0 : SAMBA_ASSERTED_IDENTITY_SERVICE :
481 : SAMBA_ASSERTED_IDENTITY_AUTHENTICATION_AUTHORITY;
482 :
483 0 : skdc_entry = talloc_get_type_abort(client->e_data,
484 : struct samba_kdc_entry);
485 :
486 0 : tmp_ctx = talloc_named(smb_ctx,
487 : 0,
488 : "mit_samba_get_pac_data_blobs context");
489 0 : if (tmp_ctx == NULL) {
490 0 : return ENOMEM;
491 : }
492 :
493 : /* Check if we have a PREAUTH key */
494 0 : if (replaced_reply_key != NULL) {
495 0 : cred_ndr_ptr = &cred_ndr;
496 : }
497 :
498 0 : is_krbtgt = ks_is_tgs_principal(smb_ctx, server->princ);
499 :
500 0 : nt_status = samba_kdc_get_pac_blobs(tmp_ctx,
501 : skdc_entry,
502 : asserted_identity,
503 : &logon_info_blob,
504 : cred_ndr_ptr,
505 : &upn_dns_info_blob,
506 : is_krbtgt ? &pac_attrs_blob : NULL,
507 : PAC_ATTRIBUTE_FLAG_PAC_WAS_GIVEN_IMPLICITLY,
508 : is_krbtgt ? &requester_sid_blob : NULL);
509 0 : if (!NT_STATUS_IS_OK(nt_status)) {
510 0 : talloc_free(tmp_ctx);
511 0 : if (NT_STATUS_EQUAL(nt_status,
512 : NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
513 0 : return ENOENT;
514 : }
515 0 : return EINVAL;
516 : }
517 :
518 0 : if (replaced_reply_key != NULL && cred_ndr != NULL) {
519 0 : code = samba_kdc_encrypt_pac_credentials(context,
520 : replaced_reply_key,
521 : cred_ndr,
522 : tmp_ctx,
523 : &cred_blob);
524 0 : if (code != 0) {
525 0 : talloc_free(tmp_ctx);
526 0 : return code;
527 : }
528 0 : pcred_blob = &cred_blob;
529 : }
530 :
531 0 : code = samba_make_krb5_pac(context,
532 : logon_info_blob,
533 : pcred_blob,
534 : upn_dns_info_blob,
535 : pac_attrs_blob,
536 : requester_sid_blob,
537 : NULL,
538 : *pac);
539 :
540 0 : talloc_free(tmp_ctx);
541 0 : return code;
542 : }
543 :
544 : #if KRB5_KDB_DAL_MAJOR_VERSION < 9
545 0 : krb5_error_code mit_samba_reget_pac(struct mit_samba_context *ctx,
546 : krb5_context context,
547 : int kdc_flags,
548 : krb5_const_principal client_principal,
549 : krb5_db_entry *client,
550 : krb5_db_entry *server,
551 : krb5_db_entry *krbtgt,
552 : krb5_keyblock *krbtgt_keyblock,
553 : krb5_pac *pac)
554 : {
555 : TALLOC_CTX *tmp_ctx;
556 : krb5_error_code code;
557 0 : struct samba_kdc_entry *client_skdc_entry = NULL;
558 0 : struct samba_kdc_entry *krbtgt_skdc_entry = NULL;
559 0 : struct samba_kdc_entry *server_skdc_entry = NULL;
560 0 : krb5_principal delegated_proxy_principal = NULL;
561 0 : krb5_pac new_pac = NULL;
562 0 : bool is_in_db = false;
563 0 : bool is_untrusted = false;
564 0 : uint32_t flags = SAMBA_KDC_FLAG_SKIP_PAC_BUFFER;
565 :
566 : /* Create a memory context early so code can use talloc_stackframe() */
567 0 : tmp_ctx = talloc_named(ctx, 0, "mit_samba_reget_pac context");
568 0 : if (tmp_ctx == NULL) {
569 0 : return ENOMEM;
570 : }
571 :
572 0 : if (client != NULL) {
573 : client_skdc_entry =
574 0 : talloc_get_type_abort(client->e_data,
575 : struct samba_kdc_entry);
576 : }
577 :
578 0 : if (server == NULL) {
579 0 : code = EINVAL;
580 0 : goto done;
581 : }
582 :
583 : server_skdc_entry =
584 0 : talloc_get_type_abort(server->e_data,
585 : struct samba_kdc_entry);
586 :
587 0 : if (krbtgt == NULL) {
588 0 : code = EINVAL;
589 0 : goto done;
590 : }
591 : krbtgt_skdc_entry =
592 0 : talloc_get_type_abort(krbtgt->e_data,
593 : struct samba_kdc_entry);
594 :
595 0 : code = samba_krbtgt_is_in_db(krbtgt_skdc_entry,
596 : &is_in_db,
597 : &is_untrusted);
598 0 : if (code != 0) {
599 0 : goto done;
600 : }
601 :
602 0 : if (is_untrusted) {
603 0 : flags |= SAMBA_KDC_FLAG_KRBTGT_IS_UNTRUSTED;
604 : }
605 :
606 0 : if (is_in_db) {
607 0 : flags |= SAMBA_KDC_FLAG_KRBTGT_IN_DB;
608 :
609 : }
610 :
611 0 : if (kdc_flags & KRB5_KDB_FLAG_PROTOCOL_TRANSITION) {
612 0 : flags |= SAMBA_KDC_FLAG_PROTOCOL_TRANSITION;
613 : }
614 :
615 0 : if (kdc_flags & KRB5_KDB_FLAG_CONSTRAINED_DELEGATION) {
616 0 : flags |= SAMBA_KDC_FLAG_CONSTRAINED_DELEGATION;
617 0 : delegated_proxy_principal = discard_const(client_principal);
618 : }
619 :
620 : /* Build an updated PAC */
621 0 : code = krb5_pac_init(context, &new_pac);
622 0 : if (code != 0) {
623 0 : goto done;
624 : }
625 :
626 0 : code = samba_kdc_update_pac(tmp_ctx,
627 : context,
628 0 : krbtgt_skdc_entry->kdc_db_ctx->samdb,
629 : flags,
630 : client_skdc_entry,
631 : server->princ,
632 : server_skdc_entry,
633 : krbtgt_skdc_entry,
634 : delegated_proxy_principal,
635 : *pac,
636 : new_pac);
637 0 : if (code != 0) {
638 0 : krb5_pac_free(context, new_pac);
639 0 : if (code == ENODATA) {
640 0 : krb5_pac_free(context, *pac);
641 0 : *pac = NULL;
642 0 : code = 0;
643 : }
644 0 : goto done;
645 : }
646 :
647 : /* We now replace the pac */
648 0 : krb5_pac_free(context, *pac);
649 0 : *pac = new_pac;
650 :
651 0 : done:
652 0 : talloc_free(tmp_ctx);
653 0 : return code;
654 : }
655 : #else
656 : krb5_error_code mit_samba_update_pac(struct mit_samba_context *ctx,
657 : krb5_context context,
658 : int kdc_flags,
659 : krb5_db_entry *client,
660 : krb5_db_entry *server,
661 : krb5_db_entry *krbtgt,
662 : krb5_pac old_pac,
663 : krb5_pac new_pac)
664 : {
665 : TALLOC_CTX *tmp_ctx = NULL;
666 : krb5_error_code code;
667 : struct samba_kdc_entry *client_skdc_entry = NULL;
668 : struct samba_kdc_entry *server_skdc_entry = NULL;
669 : struct samba_kdc_entry *krbtgt_skdc_entry = NULL;
670 : bool is_in_db = false;
671 : bool is_untrusted = false;
672 : uint32_t flags = SAMBA_KDC_FLAG_SKIP_PAC_BUFFER;
673 :
674 : /* Create a memory context early so code can use talloc_stackframe() */
675 : tmp_ctx = talloc_named(ctx, 0, "mit_samba_update_pac context");
676 : if (tmp_ctx == NULL) {
677 : return ENOMEM;
678 : }
679 :
680 : if (client != NULL) {
681 : client_skdc_entry =
682 : talloc_get_type_abort(client->e_data,
683 : struct samba_kdc_entry);
684 : }
685 :
686 : if (krbtgt == NULL) {
687 : code = EINVAL;
688 : goto done;
689 : }
690 : krbtgt_skdc_entry =
691 : talloc_get_type_abort(krbtgt->e_data,
692 : struct samba_kdc_entry);
693 :
694 : server_skdc_entry =
695 : talloc_get_type_abort(server->e_data,
696 : struct samba_kdc_entry);
697 :
698 : /*
699 : * If the krbtgt was generated by an RODC, and we are not that
700 : * RODC, then we need to regenerate the PAC - we can't trust
701 : * it, and confirm that the RODC was permitted to print this ticket
702 : *
703 : * Because of the samba_kdc_validate_pac_blob() step we can be
704 : * sure that the record in 'client' or 'server' matches the SID in the
705 : * original PAC.
706 : */
707 : code = samba_krbtgt_is_in_db(krbtgt_skdc_entry,
708 : &is_in_db,
709 : &is_untrusted);
710 : if (code != 0) {
711 : goto done;
712 : }
713 :
714 : if (is_untrusted) {
715 : flags |= SAMBA_KDC_FLAG_KRBTGT_IS_UNTRUSTED;
716 : }
717 :
718 : if (is_in_db) {
719 : flags |= SAMBA_KDC_FLAG_KRBTGT_IN_DB;
720 :
721 : }
722 :
723 : if (kdc_flags & KRB5_KDB_FLAG_CONSTRAINED_DELEGATION) {
724 : flags |= SAMBA_KDC_FLAG_CONSTRAINED_DELEGATION;
725 : }
726 :
727 : code = samba_kdc_update_pac(tmp_ctx,
728 : context,
729 : krbtgt_skdc_entry->kdc_db_ctx->samdb,
730 : flags,
731 : client_skdc_entry,
732 : server->princ,
733 : server_skdc_entry,
734 : krbtgt_skdc_entry,
735 : NULL,
736 : old_pac,
737 : new_pac);
738 : if (code != 0) {
739 : if (code == ENODATA) {
740 : /*
741 : * We can't tell the KDC to not issue a PAC. It will
742 : * just return the newly allocated empty PAC.
743 : */
744 : code = 0;
745 : }
746 : }
747 :
748 : done:
749 : talloc_free(tmp_ctx);
750 : return code;
751 : }
752 : #endif
753 :
754 : /* provide header, function is exported but there are no public headers */
755 :
756 : krb5_error_code encode_krb5_padata_sequence(krb5_pa_data *const *rep, krb5_data **code);
757 :
758 : /* this function allocates 'data' using malloc.
759 : * The caller is responsible for freeing it */
760 0 : static void samba_kdc_build_edata_reply(NTSTATUS nt_status, DATA_BLOB *e_data)
761 : {
762 0 : krb5_error_code ret = 0;
763 : krb5_pa_data pa, *ppa[2];
764 0 : krb5_data *d = NULL;
765 :
766 0 : if (!e_data)
767 0 : return;
768 :
769 0 : e_data->data = NULL;
770 0 : e_data->length = 0;
771 :
772 0 : pa.magic = KV5M_PA_DATA;
773 0 : pa.pa_type = KRB5_PADATA_PW_SALT;
774 0 : pa.length = 12;
775 0 : pa.contents = malloc(pa.length);
776 0 : if (!pa.contents) {
777 0 : return;
778 : }
779 :
780 0 : SIVAL(pa.contents, 0, NT_STATUS_V(nt_status));
781 0 : SIVAL(pa.contents, 4, 0);
782 0 : SIVAL(pa.contents, 8, 1);
783 :
784 0 : ppa[0] = &pa;
785 0 : ppa[1] = NULL;
786 :
787 0 : ret = encode_krb5_padata_sequence(ppa, &d);
788 0 : free(pa.contents);
789 0 : if (ret) {
790 0 : return;
791 : }
792 :
793 0 : e_data->data = (uint8_t *)d->data;
794 0 : e_data->length = d->length;
795 :
796 : /* free d, not d->data - gd */
797 0 : free(d);
798 :
799 0 : return;
800 : }
801 :
802 0 : int mit_samba_check_client_access(struct mit_samba_context *ctx,
803 : krb5_db_entry *client,
804 : const char *client_name,
805 : krb5_db_entry *server,
806 : const char *server_name,
807 : const char *netbios_name,
808 : bool password_change,
809 : DATA_BLOB *e_data)
810 : {
811 : struct samba_kdc_entry *skdc_entry;
812 : NTSTATUS nt_status;
813 :
814 0 : skdc_entry = talloc_get_type(client->e_data, struct samba_kdc_entry);
815 :
816 0 : nt_status = samba_kdc_check_client_access(skdc_entry,
817 : client_name,
818 : netbios_name,
819 : password_change);
820 :
821 0 : if (!NT_STATUS_IS_OK(nt_status)) {
822 0 : if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
823 0 : return ENOMEM;
824 : }
825 :
826 0 : samba_kdc_build_edata_reply(nt_status, e_data);
827 :
828 0 : return samba_kdc_map_policy_err(nt_status);
829 : }
830 :
831 0 : return 0;
832 : }
833 :
834 0 : int mit_samba_check_s4u2proxy(struct mit_samba_context *ctx,
835 : const krb5_db_entry *server,
836 : krb5_const_principal target_principal)
837 : {
838 : #if KRB5_KDB_DAL_MAJOR_VERSION < 9
839 0 : return KRB5KDC_ERR_BADOPTION;
840 : #else
841 : struct samba_kdc_entry *server_skdc_entry =
842 : talloc_get_type_abort(server->e_data, struct samba_kdc_entry);
843 : krb5_error_code code;
844 :
845 : code = samba_kdc_check_s4u2proxy(ctx->context,
846 : ctx->db_ctx,
847 : server_skdc_entry,
848 : target_principal);
849 :
850 : return code;
851 : #endif
852 : }
853 :
854 0 : krb5_error_code mit_samba_check_allowed_to_delegate_from(
855 : struct mit_samba_context *ctx,
856 : krb5_const_principal client_principal,
857 : krb5_const_principal server_principal,
858 : krb5_pac header_pac,
859 : const krb5_db_entry *proxy)
860 : {
861 : #if KRB5_KDB_DAL_MAJOR_VERSION < 8
862 : return KRB5KDC_ERR_POLICY;
863 : #else
864 : struct samba_kdc_entry *proxy_skdc_entry =
865 0 : talloc_get_type_abort(proxy->e_data, struct samba_kdc_entry);
866 : krb5_error_code code;
867 :
868 0 : code = samba_kdc_check_s4u2proxy_rbcd(ctx->context,
869 : ctx->db_ctx,
870 : client_principal,
871 : server_principal,
872 : header_pac,
873 : proxy_skdc_entry);
874 :
875 0 : return code;
876 : #endif
877 : }
878 :
879 0 : static krb5_error_code mit_samba_change_pwd_error(krb5_context context,
880 : NTSTATUS result,
881 : enum samPwdChangeReason reject_reason,
882 : struct samr_DomInfo1 *dominfo)
883 : {
884 0 : krb5_error_code code = KADM5_PASS_Q_GENERIC;
885 :
886 0 : if (NT_STATUS_EQUAL(result, NT_STATUS_NO_SUCH_USER)) {
887 0 : code = KADM5_BAD_PRINCIPAL;
888 0 : krb5_set_error_message(context,
889 : code,
890 : "No such user when changing password");
891 : }
892 0 : if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)) {
893 0 : code = KADM5_PASS_Q_GENERIC;
894 0 : krb5_set_error_message(context,
895 : code,
896 : "Not permitted to change password");
897 : }
898 0 : if (NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_RESTRICTION) &&
899 : dominfo != NULL) {
900 0 : switch (reject_reason) {
901 0 : case SAM_PWD_CHANGE_PASSWORD_TOO_SHORT:
902 0 : code = KADM5_PASS_Q_TOOSHORT;
903 0 : krb5_set_error_message(context,
904 : code,
905 : "Password too short, password "
906 : "must be at least %d characters "
907 : "long.",
908 0 : dominfo->min_password_length);
909 0 : break;
910 0 : case SAM_PWD_CHANGE_NOT_COMPLEX:
911 0 : code = KADM5_PASS_Q_DICT;
912 0 : krb5_set_error_message(context,
913 : code,
914 : "Password does not meet "
915 : "complexity requirements");
916 0 : break;
917 0 : case SAM_PWD_CHANGE_PWD_IN_HISTORY:
918 0 : code = KADM5_PASS_TOOSOON;
919 0 : krb5_set_error_message(context,
920 : code,
921 : "Password is already in password "
922 : "history. New password must not "
923 : "match any of your %d previous "
924 : "passwords.",
925 0 : dominfo->password_history_length);
926 0 : break;
927 0 : default:
928 0 : code = KADM5_PASS_Q_GENERIC;
929 0 : krb5_set_error_message(context,
930 : code,
931 : "Password change rejected, "
932 : "password changes may not be "
933 : "permitted on this account, or "
934 : "the minimum password age may "
935 : "not have elapsed.");
936 0 : break;
937 : }
938 : }
939 :
940 0 : return code;
941 : }
942 :
943 0 : int mit_samba_kpasswd_change_password(struct mit_samba_context *ctx,
944 : char *pwd,
945 : krb5_db_entry *db_entry)
946 : {
947 : NTSTATUS status;
948 0 : NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
949 : TALLOC_CTX *tmp_ctx;
950 : DATA_BLOB password;
951 : enum samPwdChangeReason reject_reason;
952 : struct samr_DomInfo1 *dominfo;
953 0 : const char *error_string = NULL;
954 : struct auth_user_info_dc *user_info_dc;
955 : struct samba_kdc_entry *p =
956 0 : talloc_get_type_abort(db_entry->e_data, struct samba_kdc_entry);
957 0 : krb5_error_code code = 0;
958 :
959 : #ifdef DEBUG_PASSWORD
960 0 : DEBUG(1,("mit_samba_kpasswd_change_password called with: %s\n", pwd));
961 : #endif
962 :
963 0 : tmp_ctx = talloc_named(ctx, 0, "mit_samba_kpasswd_change_password");
964 0 : if (tmp_ctx == NULL) {
965 0 : return ENOMEM;
966 : }
967 :
968 0 : status = samba_kdc_get_user_info_from_db(p,
969 : p->msg,
970 : &user_info_dc);
971 0 : if (!NT_STATUS_IS_OK(status)) {
972 0 : DEBUG(1,("samba_kdc_get_user_info_from_db failed: %s\n",
973 : nt_errstr(status)));
974 0 : talloc_free(tmp_ctx);
975 0 : return EINVAL;
976 : }
977 :
978 0 : status = auth_generate_session_info(tmp_ctx,
979 0 : ctx->db_ctx->lp_ctx,
980 0 : ctx->db_ctx->samdb,
981 : user_info_dc,
982 : 0, /* session_info_flags */
983 : &ctx->session_info);
984 :
985 0 : if (!NT_STATUS_IS_OK(status)) {
986 0 : DEBUG(1,("auth_generate_session_info failed: %s\n",
987 : nt_errstr(status)));
988 0 : talloc_free(tmp_ctx);
989 0 : return EINVAL;
990 : }
991 :
992 : /* password is expected as UTF16 */
993 :
994 0 : if (!convert_string_talloc(tmp_ctx, CH_UTF8, CH_UTF16,
995 : pwd, strlen(pwd),
996 : &password.data, &password.length)) {
997 0 : DEBUG(1,("convert_string_talloc failed\n"));
998 0 : talloc_free(tmp_ctx);
999 0 : return EINVAL;
1000 : }
1001 :
1002 0 : status = samdb_kpasswd_change_password(tmp_ctx,
1003 0 : ctx->db_ctx->lp_ctx,
1004 0 : ctx->db_ctx->ev_ctx,
1005 : ctx->session_info,
1006 : &password,
1007 : &reject_reason,
1008 : &dominfo,
1009 : &error_string,
1010 : &result);
1011 0 : if (!NT_STATUS_IS_OK(status)) {
1012 0 : DEBUG(1,("samdb_kpasswd_change_password failed: %s\n",
1013 : nt_errstr(status)));
1014 0 : code = KADM5_PASS_Q_GENERIC;
1015 0 : krb5_set_error_message(ctx->context, code, "%s", error_string);
1016 0 : goto out;
1017 : }
1018 :
1019 0 : if (!NT_STATUS_IS_OK(result)) {
1020 0 : code = mit_samba_change_pwd_error(ctx->context,
1021 : result,
1022 : reject_reason,
1023 : dominfo);
1024 : }
1025 :
1026 0 : out:
1027 0 : talloc_free(tmp_ctx);
1028 :
1029 0 : return code;
1030 : }
1031 :
1032 0 : void mit_samba_zero_bad_password_count(krb5_db_entry *db_entry)
1033 : {
1034 : /* struct netr_SendToSamBase *send_to_sam = NULL; */
1035 : struct samba_kdc_entry *p =
1036 0 : talloc_get_type_abort(db_entry->e_data, struct samba_kdc_entry);
1037 : struct ldb_dn *domain_dn;
1038 :
1039 0 : domain_dn = ldb_get_default_basedn(p->kdc_db_ctx->samdb);
1040 :
1041 0 : authsam_logon_success_accounting(p->kdc_db_ctx->samdb,
1042 0 : p->msg,
1043 : domain_dn,
1044 : true,
1045 : NULL, NULL);
1046 : /* TODO: RODC support */
1047 0 : }
1048 :
1049 :
1050 0 : void mit_samba_update_bad_password_count(krb5_db_entry *db_entry)
1051 : {
1052 : struct samba_kdc_entry *p =
1053 0 : talloc_get_type_abort(db_entry->e_data, struct samba_kdc_entry);
1054 :
1055 0 : authsam_update_bad_pwd_count(p->kdc_db_ctx->samdb,
1056 : p->msg,
1057 0 : ldb_get_default_basedn(p->kdc_db_ctx->samdb));
1058 0 : }
1059 :
1060 0 : bool mit_samba_princ_needs_pac(krb5_db_entry *db_entry)
1061 : {
1062 : struct samba_kdc_entry *skdc_entry =
1063 0 : talloc_get_type_abort(db_entry->e_data, struct samba_kdc_entry);
1064 :
1065 0 : return samba_princ_needs_pac(skdc_entry);
1066 : }
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