222 lines
6.5 KiB
C
222 lines
6.5 KiB
C
/*
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* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kdc_locl.h"
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static int
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name_type_ok(krb5_context context,
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krb5_kdc_configuration *config,
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krb5_const_principal principal)
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{
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int nt = krb5_principal_get_type(context, principal);
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if (!krb5_principal_is_krbtgt(context, principal))
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return 1;
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if (nt == KRB5_NT_SRV_INST || nt == KRB5_NT_UNKNOWN)
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return 1;
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if (config->strict_nametypes == 0)
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return 1;
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return 0;
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}
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struct timeval _kdc_now;
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krb5_error_code
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_kdc_db_fetch(krb5_context context,
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krb5_kdc_configuration *config,
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krb5_const_principal principal,
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unsigned flags,
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krb5uint32 *kvno_ptr,
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HDB **db,
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hdb_entry_ex **h)
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{
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hdb_entry_ex *ent = NULL;
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krb5_error_code ret = HDB_ERR_NOENTRY;
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int i;
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unsigned kvno = 0;
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krb5_principal enterprise_principal = NULL;
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krb5_const_principal princ;
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*h = NULL;
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if (!name_type_ok(context, config, principal))
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goto out2;
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if (kvno_ptr != NULL && *kvno_ptr != 0) {
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kvno = *kvno_ptr;
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flags |= HDB_F_KVNO_SPECIFIED;
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} else {
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flags |= HDB_F_ALL_KVNOS;
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}
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ent = calloc(1, sizeof (*ent));
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if (ent == NULL)
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return krb5_enomem(context);
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if (principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
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if (principal->name.name_string.len != 1) {
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ret = KRB5_PARSE_MALFORMED;
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krb5_set_error_message(context, ret,
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"malformed request: "
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"enterprise name with %d name components",
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principal->name.name_string.len);
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goto out;
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}
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ret = krb5_parse_name(context, principal->name.name_string.val[0],
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&enterprise_principal);
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if (ret)
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goto out;
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}
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for (i = 0; i < config->num_db; i++) {
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ret = config->db[i]->hdb_open(context, config->db[i], O_RDONLY, 0);
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if (ret) {
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const char *msg = krb5_get_error_message(context, ret);
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kdc_log(context, config, 0, "Failed to open database: %s", msg);
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krb5_free_error_message(context, msg);
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continue;
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}
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princ = principal;
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if (!(config->db[i]->hdb_capability_flags & HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL) && enterprise_principal)
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princ = enterprise_principal;
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ret = config->db[i]->hdb_fetch_kvno(context,
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config->db[i],
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princ,
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flags | HDB_F_DECRYPT,
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kvno,
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ent);
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config->db[i]->hdb_close(context, config->db[i]);
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switch (ret) {
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case HDB_ERR_WRONG_REALM:
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/*
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* the ent->entry.principal just contains hints for the client
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* to retry. This is important for enterprise principal routing
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* between trusts.
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*/
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/* fall through */
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case 0:
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if (db)
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*db = config->db[i];
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*h = ent;
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ent = NULL;
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goto out;
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case HDB_ERR_NOENTRY:
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/* Check the other databases */
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continue;
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default:
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/*
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* This is really important, because errors like
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* HDB_ERR_NOT_FOUND_HERE (used to indicate to Samba that
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* the RODC on which this code is running does not have
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* the key we need, and so a proxy to the KDC is required)
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* have specific meaning, and need to be propogated up.
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*/
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goto out;
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}
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}
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out2:
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if (ret == HDB_ERR_NOENTRY) {
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krb5_set_error_message(context, ret, "no such entry found in hdb");
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}
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out:
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krb5_free_principal(context, enterprise_principal);
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free(ent);
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return ret;
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}
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void
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_kdc_free_ent(krb5_context context, hdb_entry_ex *ent)
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{
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hdb_free_entry (context, ent);
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free (ent);
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}
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/*
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* Use the order list of preferred encryption types and sort the
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* available keys and return the most preferred key.
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*/
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krb5_error_code
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_kdc_get_preferred_key(krb5_context context,
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krb5_kdc_configuration *config,
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hdb_entry_ex *h,
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const char *name,
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krb5_enctype *enctype,
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Key **key)
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{
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krb5_error_code ret;
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int i;
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if (config->use_strongest_server_key) {
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const krb5_enctype *p = krb5_kerberos_enctypes(context);
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for (i = 0; p[i] != (krb5_enctype)ETYPE_NULL; i++) {
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if (krb5_enctype_valid(context, p[i]) != 0 &&
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!_kdc_is_weak_exception(h->entry.principal, p[i]))
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continue;
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ret = hdb_enctype2key(context, &h->entry, NULL, p[i], key);
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if (ret != 0)
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continue;
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if (enctype != NULL)
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*enctype = p[i];
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return 0;
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}
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} else {
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*key = NULL;
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for (i = 0; i < h->entry.keys.len; i++) {
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if (krb5_enctype_valid(context, h->entry.keys.val[i].key.keytype) != 0 &&
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!_kdc_is_weak_exception(h->entry.principal, h->entry.keys.val[i].key.keytype))
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continue;
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ret = hdb_enctype2key(context, &h->entry, NULL,
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h->entry.keys.val[i].key.keytype, key);
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if (ret != 0)
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continue;
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if (enctype != NULL)
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*enctype = (*key)->key.keytype;
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return 0;
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}
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}
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krb5_set_error_message(context, EINVAL,
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"No valid kerberos key found for %s", name);
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return EINVAL; /* XXX */
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}
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