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906dbd0a4b
We need to take the value from the msDS-SupportedEncryptionTypes
attribute and only take the default if there's no value or
if the value is 0.
For krbtgt and DC accounts we need to force support for
ARCFOUR-HMAC-MD5 and AES encryption types and add the related bits
in addtition. (Note for krbtgt msDS-SupportedEncryptionTypes is
completely ignored the hardcoded value is the default, so there's
no AES256-SK for krbtgt).
For UF_USE_DES_KEY_ONLY on the account we reset
the value to 0, these accounts are in fact disabled completely,
as they always result in KRB5KDC_ERR_ETYPE_NOSUPP.
Then we try to get all encryption keys marked in
supported_enctypes, and the available_enctypes
is a reduced set depending on what keys are
actually stored in the database.
We select the supported session key enctypes by the available
keys and in addition based on AES256-SK as well as the
"kdc force enable rc4 weak session keys" option.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13135
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15237
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
(cherry picked from commit fde745ec34)
[jsutton@samba.org Adapted to older KDC code]
150 lines
3.9 KiB
C
150 lines
3.9 KiB
C
/*
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Unix SMB/CIFS implementation.
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Database Glue between Samba and the KDC
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Copyright (C) Guenther Deschner <gd@samba.org> 2014
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Copyright (C) Andreas Schneider <asn@samba.org> 2014
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _KDC_SDB_H_
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#define _KDC_SDB_H_
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struct sdb_salt {
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unsigned int type;
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krb5_data salt;
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};
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struct sdb_key {
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unsigned int *mkvno;
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krb5_keyblock key;
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struct sdb_salt *salt;
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};
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struct sdb_keys {
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unsigned int len;
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struct sdb_key *val;
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};
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struct sdb_event {
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krb5_principal principal;
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time_t time;
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};
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struct sdb_etypes {
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unsigned len;
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krb5_enctype *val;
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};
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struct SDBFlags {
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unsigned int initial:1;
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unsigned int forwardable:1;
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unsigned int proxiable:1;
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unsigned int renewable:1;
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unsigned int postdate:1;
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unsigned int server:1;
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unsigned int client:1;
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unsigned int invalid:1;
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unsigned int require_preauth:1;
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unsigned int change_pw:1;
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unsigned int require_hwauth:1;
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unsigned int ok_as_delegate:1;
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unsigned int user_to_user:1;
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unsigned int immutable:1;
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unsigned int trusted_for_delegation:1;
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unsigned int allow_kerberos4:1;
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unsigned int allow_digest:1;
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unsigned int locked_out:1;
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unsigned int require_pwchange:1;
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unsigned int materialize:1;
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unsigned int virtual_keys:1;
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unsigned int virtual:1;
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unsigned int synthetic:1;
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unsigned int no_auth_data_reqd:1;
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unsigned int _unused24:1;
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unsigned int _unused25:1;
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unsigned int _unused26:1;
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unsigned int _unused27:1;
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unsigned int _unused28:1;
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unsigned int _unused29:1;
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unsigned int force_canonicalize:1;
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unsigned int do_not_store:1;
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};
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struct sdb_entry {
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krb5_principal principal;
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unsigned int kvno;
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struct sdb_keys keys;
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struct sdb_etypes *etypes;
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struct sdb_etypes *session_etypes;
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struct sdb_event created_by;
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struct sdb_event *modified_by;
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time_t *valid_start;
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time_t *valid_end;
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time_t *pw_end;
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unsigned int *max_life;
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unsigned int *max_renew;
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struct SDBFlags flags;
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};
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struct sdb_entry_ex {
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void *ctx;
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struct sdb_entry entry;
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void (*free_entry)(struct sdb_entry_ex *);
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};
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#define SDB_ERR_NOENTRY 36150275
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#define SDB_ERR_NOT_FOUND_HERE 36150287
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#define SDB_ERR_WRONG_REALM 36150289
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/* These must match the values in hdb.h */
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#define SDB_F_DECRYPT 1 /* decrypt keys */
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#define SDB_F_GET_CLIENT 4 /* fetch client */
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#define SDB_F_GET_SERVER 8 /* fetch server */
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#define SDB_F_GET_KRBTGT 16 /* fetch krbtgt */
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#define SDB_F_GET_ANY 28 /* fetch any of client,server,krbtgt */
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#define SDB_F_CANON 32 /* want canonicalition */
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#define SDB_F_ADMIN_DATA 64 /* want data that kdc don't use */
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#define SDB_F_KVNO_SPECIFIED 128 /* we want a particular KVNO */
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#define SDB_F_FOR_AS_REQ 4096 /* fetch is for a AS REQ */
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#define SDB_F_FOR_TGS_REQ 8192 /* fetch is for a TGS REQ */
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#define SDB_F_HDB_MASK (SDB_F_DECRYPT | \
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SDB_F_GET_CLIENT| \
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SDB_F_GET_SERVER | \
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SDB_F_GET_KRBTGT | \
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SDB_F_CANON | \
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SDB_F_ADMIN_DATA | \
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SDB_F_KVNO_SPECIFIED | \
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SDB_F_FOR_AS_REQ | \
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SDB_F_FOR_TGS_REQ)
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/* This is not supported by HDB */
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#define SDB_F_FORCE_CANON 16384 /* force canonicalition */
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void sdb_free_entry(struct sdb_entry_ex *e);
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void free_sdb_entry(struct sdb_entry *s);
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struct SDBFlags int2SDBFlags(unsigned n);
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krb5_error_code sdb_entry_set_etypes(struct sdb_entry *s);
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krb5_error_code sdb_entry_set_session_etypes(struct sdb_entry *s,
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bool add_aes256,
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bool add_aes128,
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bool add_rc4);
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#endif /* _KDC_SDB_H_ */
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