2 Unix SMB/CIFS implementation.
4 Kerberos utility functions for GENSEC
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
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.
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.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "system/kerberos.h"
25 #include "auth/kerberos/kerberos.h"
26 #include "auth/credentials/credentials.h"
27 #include "auth/credentials/credentials_proto.h"
28 #include "auth/credentials/credentials_krb5.h"
29 #include "auth/kerberos/kerberos_credentials.h"
30 #include "auth/kerberos/kerberos_util.h"
32 #include "param/secrets.h"
34 struct principal_container {
35 struct smb_krb5_context *smb_krb5_context;
36 krb5_principal principal;
37 const char *string_form; /* Optional */
40 static krb5_error_code free_principal(struct principal_container *pc)
42 /* current heimdal - 0.6.3, which we need anyway, fixes segfaults here */
43 krb5_free_principal(pc->smb_krb5_context->krb5_context, pc->principal);
49 static krb5_error_code parse_principal(TALLOC_CTX *parent_ctx,
50 const char *princ_string,
51 struct smb_krb5_context *smb_krb5_context,
52 krb5_principal *princ,
53 const char **error_string)
56 struct principal_container *mem_ctx;
57 if (princ_string == NULL) {
62 ret = krb5_parse_name(smb_krb5_context->krb5_context,
66 (*error_string) = smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, parent_ctx);
70 mem_ctx = talloc(parent_ctx, struct principal_container);
72 (*error_string) = error_message(ENOMEM);
76 /* This song-and-dance effectivly puts the principal
77 * into talloc, so we can't loose it. */
78 mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
79 mem_ctx->principal = *princ;
80 talloc_set_destructor(mem_ctx, free_principal);
84 static krb5_error_code principals_from_msg(TALLOC_CTX *parent_ctx,
85 struct ldb_message *msg,
86 struct smb_krb5_context *smb_krb5_context,
87 struct principal_container ***principals_out,
88 const char **error_string)
93 const char *realm = ldb_msg_find_attr_as_string(msg, "realm", NULL);
94 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
95 struct ldb_message_element *spn_el = ldb_msg_find_element(msg, "servicePrincipalName");
97 struct principal_container **principals;
98 tmp_ctx = talloc_new(parent_ctx);
100 *error_string = "Cannot allocate tmp_ctx";
105 *error_string = "Cannot have a kerberos secret in secrets.ldb without a realm";
109 upper_realm = strupper_talloc(tmp_ctx, realm);
111 talloc_free(tmp_ctx);
112 *error_string = "Cannot allocate full upper case realm";
116 principals = talloc_array(tmp_ctx, struct principal_container *, spn_el ? (spn_el->num_values + 2) : 2);
118 spn_el = ldb_msg_find_element(msg, "servicePrincipalName");
119 for (i=0; spn_el && i < spn_el->num_values; i++) {
120 principals[i] = talloc(principals, struct principal_container);
121 if (!principals[i]) {
122 talloc_free(tmp_ctx);
123 *error_string = "Cannot allocate mem_ctx";
127 principals[i]->smb_krb5_context = talloc_reference(principals[i], smb_krb5_context);
128 principals[i]->string_form = talloc_asprintf(principals[i], "%*.*s@%s",
129 (int)spn_el->values[i].length,
130 (int)spn_el->values[i].length,
131 (const char *)spn_el->values[i].data, upper_realm);
132 if (!principals[i]->string_form) {
133 talloc_free(tmp_ctx);
134 *error_string = "Cannot allocate full samAccountName";
138 ret = krb5_parse_name(smb_krb5_context->krb5_context,
139 principals[i]->string_form, &principals[i]->principal);
142 talloc_free(tmp_ctx);
143 (*error_string) = smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, parent_ctx);
147 /* This song-and-dance effectivly puts the principal
148 * into talloc, so we can't loose it. */
149 talloc_set_destructor(principals[i], free_principal);
152 if (samAccountName) {
153 principals[i] = talloc(principals, struct principal_container);
154 if (!principals[i]) {
155 talloc_free(tmp_ctx);
156 *error_string = "Cannot allocate mem_ctx";
160 principals[i]->smb_krb5_context = talloc_reference(principals[i], smb_krb5_context);
161 principals[i]->string_form = talloc_asprintf(parent_ctx, "%s@%s", samAccountName, upper_realm);
162 if (!principals[i]->string_form) {
163 talloc_free(tmp_ctx);
164 *error_string = "Cannot allocate full samAccountName";
168 ret = krb5_make_principal(smb_krb5_context->krb5_context, &principals[i]->principal, upper_realm, samAccountName,
171 talloc_free(tmp_ctx);
172 (*error_string) = smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, parent_ctx);
176 /* This song-and-dance effectively puts the principal
177 * into talloc, so we can't loose it. */
178 talloc_set_destructor(principals[i], free_principal);
182 principals[i] = NULL;
183 *principals_out = talloc_steal(parent_ctx, principals);
185 talloc_free(tmp_ctx);
189 static krb5_error_code salt_principal_from_msg(TALLOC_CTX *parent_ctx,
190 struct ldb_message *msg,
191 struct smb_krb5_context *smb_krb5_context,
192 krb5_principal *salt_princ,
193 const char **error_string)
195 const char *salt_principal = ldb_msg_find_attr_as_string(msg, "saltPrincipal", NULL);
196 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
197 const char *realm = ldb_msg_find_attr_as_string(msg, "realm", NULL);
198 if (salt_principal) {
199 return parse_principal(parent_ctx, salt_principal, smb_krb5_context, salt_princ, error_string);
200 } else if (samAccountName) {
202 char *machine_username;
208 struct principal_container *mem_ctx = talloc(parent_ctx, struct principal_container);
210 *error_string = "Cannot allocate mem_ctx";
214 tmp_ctx = talloc_new(mem_ctx);
216 talloc_free(mem_ctx);
217 *error_string = "Cannot allocate tmp_ctx";
222 *error_string = "Cannot have a kerberos secret in secrets.ldb without a realm";
226 machine_username = talloc_strdup(tmp_ctx, samAccountName);
227 if (!machine_username) {
228 talloc_free(mem_ctx);
229 *error_string = "Cannot duplicate samAccountName";
233 if (machine_username[strlen(machine_username)-1] == '$') {
234 machine_username[strlen(machine_username)-1] = '\0';
237 lower_realm = strlower_talloc(tmp_ctx, realm);
239 talloc_free(mem_ctx);
240 *error_string = "Cannot allocate to lower case realm";
244 upper_realm = strupper_talloc(tmp_ctx, realm);
246 talloc_free(mem_ctx);
247 *error_string = "Cannot allocate to upper case realm";
251 salt_body = talloc_asprintf(tmp_ctx, "%s.%s", machine_username,
253 talloc_free(lower_realm);
254 talloc_free(machine_username);
256 talloc_free(mem_ctx);
257 *error_string = "Cannot form salt principal body";
261 ret = krb5_make_principal(smb_krb5_context->krb5_context, salt_princ,
263 "host", salt_body, NULL);
265 /* This song-and-dance effectively puts the principal
266 * into talloc, so we can't loose it. */
267 mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
268 mem_ctx->principal = *salt_princ;
269 talloc_set_destructor(mem_ctx, free_principal);
271 (*error_string) = smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, parent_ctx);
273 talloc_free(tmp_ctx);
276 (*error_string) = "Cannot determine salt principal, no saltPrincipal or samAccountName specified";
281 /* Obtain the principal set on this context. Requires a
282 * smb_krb5_context because we are doing krb5 principal parsing with
283 * the library routines. The returned princ is placed in the talloc
284 * system by means of a destructor (do *not* free). */
286 krb5_error_code principal_from_credentials(TALLOC_CTX *parent_ctx,
287 struct cli_credentials *credentials,
288 struct smb_krb5_context *smb_krb5_context,
289 krb5_principal *princ,
290 enum credentials_obtained *obtained,
291 const char **error_string)
294 const char *princ_string;
295 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
297 (*error_string) = error_message(ENOMEM);
300 princ_string = cli_credentials_get_principal_and_obtained(credentials, mem_ctx, obtained);
302 (*error_string) = error_message(ENOMEM);
306 ret = parse_principal(parent_ctx, princ_string,
307 smb_krb5_context, princ, error_string);
308 talloc_free(mem_ctx);
312 /* Obtain the principal set on this context. Requires a
313 * smb_krb5_context because we are doing krb5 principal parsing with
314 * the library routines. The returned princ is placed in the talloc
315 * system by means of a destructor (do *not* free). */
317 krb5_error_code impersonate_principal_from_credentials(TALLOC_CTX *parent_ctx,
318 struct cli_credentials *credentials,
319 struct smb_krb5_context *smb_krb5_context,
320 krb5_principal *princ,
321 const char **error_string)
323 return parse_principal(parent_ctx, cli_credentials_get_impersonate_principal(credentials),
324 smb_krb5_context, princ, error_string);
328 * Return a freshly allocated ccache (destroyed by destructor on child
329 * of parent_ctx), for a given set of client credentials
332 krb5_error_code kinit_to_ccache(TALLOC_CTX *parent_ctx,
333 struct cli_credentials *credentials,
334 struct smb_krb5_context *smb_krb5_context,
335 struct tevent_context *event_ctx,
337 enum credentials_obtained *obtained,
338 const char **error_string)
341 const char *password;
342 const char *self_service;
343 const char *target_service;
345 krb5_principal princ;
346 krb5_principal impersonate_principal;
348 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
349 krb5_get_init_creds_opt *krb_options;
352 (*error_string) = strerror(ENOMEM);
356 ret = principal_from_credentials(mem_ctx, credentials, smb_krb5_context, &princ, obtained, error_string);
358 talloc_free(mem_ctx);
362 ret = impersonate_principal_from_credentials(mem_ctx, credentials, smb_krb5_context, &impersonate_principal, error_string);
364 talloc_free(mem_ctx);
368 self_service = cli_credentials_get_self_service(credentials);
369 target_service = cli_credentials_get_target_service(credentials);
371 password = cli_credentials_get_password(credentials);
373 /* setup the krb5 options we want */
374 if ((ret = krb5_get_init_creds_opt_alloc(smb_krb5_context->krb5_context, &krb_options))) {
375 (*error_string) = talloc_asprintf(credentials, "krb5_get_init_creds_opt_alloc failed (%s)\n",
376 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
378 talloc_free(mem_ctx);
382 /* get the defaults */
383 krb5_get_init_creds_opt_set_default_flags(smb_krb5_context->krb5_context, NULL, NULL, krb_options);
385 /* set if we want a forwardable ticket */
386 switch (cli_credentials_get_krb_forwardable(credentials)) {
387 case CRED_AUTO_KRB_FORWARDABLE:
389 case CRED_NO_KRB_FORWARDABLE:
390 krb5_get_init_creds_opt_set_forwardable(krb_options, FALSE);
392 case CRED_FORCE_KRB_FORWARDABLE:
393 krb5_get_init_creds_opt_set_forwardable(krb_options, TRUE);
399 struct tevent_context *previous_ev;
400 /* Do this every time, in case we have weird recursive issues here */
401 ret = smb_krb5_context_set_event_ctx(smb_krb5_context, event_ctx, &previous_ev);
403 talloc_free(mem_ctx);
407 ret = kerberos_kinit_password_cc(smb_krb5_context->krb5_context, ccache,
409 impersonate_principal,
414 } else if (impersonate_principal) {
415 talloc_free(mem_ctx);
416 (*error_string) = "INTERNAL error: Cannot impersonate principal with just a keyblock. A password must be specified in the credentials";
419 /* No password available, try to use a keyblock instead */
421 krb5_keyblock keyblock;
422 const struct samr_Password *mach_pwd;
423 mach_pwd = cli_credentials_get_nt_hash(credentials, mem_ctx);
425 talloc_free(mem_ctx);
426 (*error_string) = "kinit_to_ccache: No password available for kinit\n";
427 krb5_get_init_creds_opt_free(smb_krb5_context->krb5_context, krb_options);
428 smb_krb5_context_remove_event_ctx(smb_krb5_context, previous_ev, event_ctx);
431 ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
432 ENCTYPE_ARCFOUR_HMAC,
433 mach_pwd->hash, sizeof(mach_pwd->hash),
437 ret = kerberos_kinit_keyblock_cc(smb_krb5_context->krb5_context, ccache,
439 target_service, krb_options,
441 krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &keyblock);
445 smb_krb5_context_remove_event_ctx(smb_krb5_context, previous_ev, event_ctx);
447 if (ret == KRB5KRB_AP_ERR_SKEW || ret == KRB5_KDCREP_SKEW) {
448 /* Perhaps we have been given an invalid skew, so try again without it */
449 time_t t = time(NULL);
450 krb5_set_real_time(smb_krb5_context->krb5_context, t, 0);
452 /* not a skew problem */
457 krb5_get_init_creds_opt_free(smb_krb5_context->krb5_context, krb_options);
459 if (ret == KRB5KRB_AP_ERR_SKEW || ret == KRB5_KDCREP_SKEW) {
460 (*error_string) = talloc_asprintf(credentials, "kinit for %s failed (%s)\n",
461 cli_credentials_get_principal(credentials, mem_ctx),
462 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
464 talloc_free(mem_ctx);
468 /* cope with ticket being in the future due to clock skew */
469 if ((unsigned)kdc_time > time(NULL)) {
470 time_t t = time(NULL);
471 int time_offset =(unsigned)kdc_time-t;
472 DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset));
473 krb5_set_real_time(smb_krb5_context->krb5_context, t + time_offset + 1, 0);
476 if (ret == KRB5KDC_ERR_PREAUTH_FAILED && cli_credentials_wrong_password(credentials)) {
477 ret = kinit_to_ccache(parent_ctx,
486 (*error_string) = talloc_asprintf(credentials, "kinit for %s failed (%s)\n",
487 cli_credentials_get_principal(credentials, mem_ctx),
488 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
490 talloc_free(mem_ctx);
493 talloc_free(mem_ctx);
497 static krb5_error_code free_keytab_container(struct keytab_container *ktc)
499 return krb5_kt_close(ktc->smb_krb5_context->krb5_context, ktc->keytab);
502 krb5_error_code smb_krb5_get_keytab_container(TALLOC_CTX *mem_ctx,
503 struct smb_krb5_context *smb_krb5_context,
504 const char *keytab_name, struct keytab_container **ktc)
508 ret = krb5_kt_resolve(smb_krb5_context->krb5_context, keytab_name, &keytab);
510 DEBUG(1,("failed to open krb5 keytab: %s\n",
511 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
516 *ktc = talloc(mem_ctx, struct keytab_container);
521 (*ktc)->smb_krb5_context = talloc_reference(*ktc, smb_krb5_context);
522 (*ktc)->keytab = keytab;
523 talloc_set_destructor(*ktc, free_keytab_container);
528 static krb5_error_code keytab_add_keys(TALLOC_CTX *parent_ctx,
529 struct principal_container **principals,
530 krb5_principal salt_princ,
532 const char *password_s,
533 struct smb_krb5_context *smb_krb5_context,
534 krb5_enctype *enctypes,
536 const char **error_string)
542 password.data = discard_const_p(char *, password_s);
543 password.length = strlen(password_s);
545 for (i=0; enctypes[i]; i++) {
546 krb5_keytab_entry entry;
550 ret = create_kerberos_key_from_string_direct(smb_krb5_context->krb5_context,
551 salt_princ, &password, &entry.keyblock, enctypes[i]);
558 for (p=0; principals[p]; p++) {
559 entry.principal = principals[p]->principal;
560 ret = krb5_kt_add_entry(smb_krb5_context->krb5_context, keytab, &entry);
562 char *k5_error_string = smb_get_krb5_error_message(smb_krb5_context->krb5_context,
564 *error_string = talloc_asprintf(parent_ctx, "Failed to add enctype %d entry for %s(kvno %d) to keytab: %s\n",
566 principals[p]->string_form,
569 talloc_free(k5_error_string);
570 krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
574 DEBUG(5, ("Added %s(kvno %d) to keytab (enctype %d)\n",
575 principals[p]->string_form, kvno,
578 krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
583 static krb5_error_code create_keytab(TALLOC_CTX *parent_ctx,
584 struct ldb_message *msg,
585 struct principal_container **principals,
586 struct smb_krb5_context *smb_krb5_context,
589 const char **error_string)
592 const char *password_s;
593 const char *old_secret;
595 uint32_t enctype_bitmap;
596 krb5_principal salt_princ;
597 krb5_enctype *enctypes;
598 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
600 *error_string = "unable to allocate tmp_ctx for create_keytab";
604 /* The salt used to generate these entries may be different however, fetch that */
605 ret = salt_principal_from_msg(mem_ctx, msg,
607 &salt_princ, error_string);
609 talloc_free(mem_ctx);
613 kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
615 /* Finally, do the dance to get the password to put in the entry */
616 password_s = ldb_msg_find_attr_as_string(msg, "secret", NULL);
619 /* There is no password here, so nothing to do */
620 talloc_free(mem_ctx);
624 if (add_old && kvno != 0) {
625 old_secret = ldb_msg_find_attr_as_string(msg, "priorSecret", NULL);
630 enctype_bitmap = (uint32_t)ldb_msg_find_attr_as_int(msg, "msDS-SupportedEncryptionTypes", ENC_ALL_TYPES);
632 ret = kerberos_enctype_bitmap_to_enctypes(mem_ctx, enctype_bitmap, &enctypes);
634 *error_string = talloc_asprintf(parent_ctx, "create_keytab: generating list of encryption types failed (%s)\n",
635 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
637 talloc_free(mem_ctx);
641 ret = keytab_add_keys(mem_ctx, principals,
643 kvno, password_s, smb_krb5_context,
644 enctypes, keytab, error_string);
646 talloc_free(mem_ctx);
651 ret = keytab_add_keys(mem_ctx, principals,
653 kvno - 1, old_secret, smb_krb5_context,
654 enctypes, keytab, error_string);
656 talloc_free(mem_ctx);
661 talloc_free(mem_ctx);
666 * Walk the keytab, looking for entries of this principal name, with KVNO other than current kvno -1.
668 * These entries are now stale, we only keep the current, and previous entries around.
670 * Inspired by the code in Samba3 for 'use kerberos keytab'.
674 static krb5_error_code remove_old_entries(TALLOC_CTX *parent_ctx,
675 struct ldb_message *msg,
676 struct principal_container **principals,
677 bool delete_all_kvno,
678 struct smb_krb5_context *smb_krb5_context,
679 krb5_keytab keytab, bool *found_previous,
680 const char **error_string)
682 krb5_error_code ret, ret2;
683 krb5_kt_cursor cursor;
685 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
691 *found_previous = false;
693 kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
695 /* for each entry in the keytab */
696 ret = krb5_kt_start_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
700 case HEIM_ERR_OPNOTSUPP:
703 /* no point enumerating if there isn't anything here */
704 talloc_free(mem_ctx);
707 *error_string = talloc_asprintf(parent_ctx, "failed to open keytab for read of old entries: %s\n",
708 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
710 talloc_free(mem_ctx);
716 bool matched = false;
717 krb5_keytab_entry entry;
718 ret = krb5_kt_next_entry(smb_krb5_context->krb5_context, keytab, &entry, &cursor);
722 for (i = 0; principals[i]; i++) {
723 /* if it matches our principal */
724 if (krb5_kt_compare(smb_krb5_context->krb5_context, &entry, principals[i]->principal, 0, 0)) {
731 /* Free the entry, it wasn't the one we were looking for anyway */
732 krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
736 /* delete it, if it is not kvno -1 */
737 if (entry.vno != (kvno - 1 )) {
738 /* Release the enumeration. We are going to
739 * have to start this from the top again,
740 * because deletes during enumeration may not
741 * always be consistent.
743 * Also, the enumeration locks a FILE: keytab
746 krb5_kt_end_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
748 ret = krb5_kt_remove_entry(smb_krb5_context->krb5_context, keytab, &entry);
749 krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
751 /* Deleted: Restart from the top */
752 ret2 = krb5_kt_start_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
754 krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
755 DEBUG(1,("failed to restart enumeration of keytab: %s\n",
756 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
759 talloc_free(mem_ctx);
768 *found_previous = true;
771 /* Free the entry, we don't need it any more */
772 krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
776 krb5_kt_end_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
786 *error_string = talloc_asprintf(parent_ctx, "failed in deleting old entries for principal: %s\n",
787 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
790 talloc_free(mem_ctx);
794 krb5_error_code smb_krb5_update_keytab(TALLOC_CTX *parent_ctx,
795 struct smb_krb5_context *smb_krb5_context,
796 struct ldb_context *ldb,
797 struct ldb_message *msg,
798 bool delete_all_kvno,
799 const char **error_string)
803 TALLOC_CTX *mem_ctx = talloc_new(NULL);
804 struct keytab_container *keytab_container;
805 struct principal_container **principals;
806 const char *keytab_name;
812 keytab_name = keytab_name_from_msg(mem_ctx, ldb, msg);
817 ret = smb_krb5_get_keytab_container(mem_ctx, smb_krb5_context, keytab_name, &keytab_container);
820 talloc_free(mem_ctx);
824 DEBUG(5, ("Opened keytab %s\n", keytab_name));
826 /* Get the principal we will store the new keytab entries under */
827 ret = principals_from_msg(mem_ctx, msg, smb_krb5_context, &principals, error_string);
830 *error_string = talloc_asprintf(parent_ctx, "Failed to load principals from ldb message: %s\n", *error_string);
831 talloc_free(mem_ctx);
835 ret = remove_old_entries(mem_ctx, msg, principals, delete_all_kvno,
836 smb_krb5_context, keytab_container->keytab, &found_previous, error_string);
838 *error_string = talloc_asprintf(parent_ctx, "Failed to remove old principals from keytab: %s\n", *error_string);
839 talloc_free(mem_ctx);
843 if (!delete_all_kvno) {
844 /* Create a new keytab. If during the cleanout we found
845 * entires for kvno -1, then don't try and duplicate them.
846 * Otherwise, add kvno, and kvno -1 */
848 ret = create_keytab(mem_ctx, msg, principals,
850 keytab_container->keytab,
851 found_previous ? false : true, error_string);
853 talloc_free(mem_ctx);
857 krb5_error_code smb_krb5_create_memory_keytab(TALLOC_CTX *parent_ctx,
858 struct cli_credentials *machine_account,
859 struct smb_krb5_context *smb_krb5_context,
860 struct keytab_container **keytab_container)
863 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
864 const char *rand_string;
865 const char *keytab_name;
866 struct ldb_message *msg;
867 const char *error_string;
872 *keytab_container = talloc(mem_ctx, struct keytab_container);
874 rand_string = generate_random_str(mem_ctx, 16);
876 talloc_free(mem_ctx);
880 keytab_name = talloc_asprintf(mem_ctx, "MEMORY:%s",
883 talloc_free(mem_ctx);
887 ret = smb_krb5_get_keytab_container(mem_ctx, smb_krb5_context, keytab_name, keytab_container);
892 msg = ldb_msg_new(mem_ctx);
894 talloc_free(mem_ctx);
897 ldb_msg_add_string(msg, "krb5Keytab", keytab_name);
898 ldb_msg_add_string(msg, "secret", cli_credentials_get_password(machine_account));
899 ldb_msg_add_string(msg, "samAccountName", cli_credentials_get_username(machine_account));
900 ldb_msg_add_string(msg, "realm", cli_credentials_get_realm(machine_account));
901 ldb_msg_add_fmt(msg, "msDS-KeyVersionNumber", "%d", (int)cli_credentials_get_kvno(machine_account));
903 ret = smb_krb5_update_keytab(mem_ctx, smb_krb5_context, NULL, msg, false, &error_string);
905 talloc_steal(parent_ctx, *keytab_container);
907 DEBUG(0, ("Failed to create in-memory keytab: %s\n", error_string));
908 *keytab_container = NULL;
910 talloc_free(mem_ctx);
913 /* Translate between the IETF encryption type values and the Microsoft msDS-SupportedEncryptionTypes values */
914 uint32_t kerberos_enctype_to_bitmap(krb5_enctype enc_type_enum)
916 switch (enc_type_enum) {
917 case ENCTYPE_DES_CBC_CRC:
919 case ENCTYPE_DES_CBC_MD5:
921 case ENCTYPE_ARCFOUR_HMAC_MD5:
922 return ENC_RC4_HMAC_MD5;
923 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
924 return ENC_HMAC_SHA1_96_AES128;
925 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
926 return ENC_HMAC_SHA1_96_AES256;
932 /* Translate between the Microsoft msDS-SupportedEncryptionTypes values and the IETF encryption type values */
933 krb5_enctype kerberos_enctype_bitmap_to_enctype(uint32_t enctype_bitmap)
935 switch (enctype_bitmap) {
937 return ENCTYPE_DES_CBC_CRC;
939 return ENCTYPE_DES_CBC_MD5;
940 case ENC_RC4_HMAC_MD5:
941 return ENCTYPE_ARCFOUR_HMAC_MD5;
942 case ENC_HMAC_SHA1_96_AES128:
943 return ENCTYPE_AES128_CTS_HMAC_SHA1_96;
944 case ENC_HMAC_SHA1_96_AES256:
945 return ENCTYPE_AES256_CTS_HMAC_SHA1_96;
951 /* Return an array of krb5_enctype values */
952 krb5_error_code kerberos_enctype_bitmap_to_enctypes(TALLOC_CTX *mem_ctx, uint32_t enctype_bitmap, krb5_enctype **enctypes)
954 unsigned int i, j = 0;
955 *enctypes = talloc_zero_array(mem_ctx, krb5_enctype, (8*sizeof(enctype_bitmap))+1);
959 for (i=0; i<(8*sizeof(enctype_bitmap)); i++) {
960 uint32_t bit_value = (1 << i) & enctype_bitmap;
961 if (bit_value & enctype_bitmap) {
962 (*enctypes)[j] = kerberos_enctype_bitmap_to_enctype(bit_value);
963 if (!(*enctypes)[j]) {