5447b81fb1
This is a large commit that adds several features: - Revamps and moves virtual host-based service principal functionality from kdc/ to lib/hdb/ so that it may be automatically visible to lib/kadm5/, as well as kadmin(1)/kadmind(8) and ktutil(1). The changes are backwards-incompatible. - Completes support for documenting a service principal's supported enctypes in its HDB entry independently of its long-term keys. This will reduce HDB bloat by not requiring that service principals have more long-term keys than they need just to document the service's supported enctypes. - Adds support for storing krb5.conf content in principals' HDB entries. This may eventually be used for causing Heimdal KDC services to reconfigure primary/secondary roles automatically by discovering the configured primary in an HDB entry for the realm. For now this will be used to help reduce the amount of configuration needed by clients of an upcoming HTTP binding of the kadmin service.
443 lines
10 KiB
C
443 lines
10 KiB
C
/*
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* Copyright (c) 1999 - 2002 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 "hdb_locl.h"
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/* keytab backend for HDB databases */
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struct hdb_data {
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char *dbname;
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char *mkey;
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};
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struct hdb_cursor {
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HDB *db;
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hdb_entry_ex hdb_entry;
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int first, next;
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int key_idx;
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};
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/*
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* the format for HDB keytabs is:
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* HDB:[HDBFORMAT:database-specific-data[:mkey=mkey-file]]
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*/
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static krb5_error_code KRB5_CALLCONV
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hdb_resolve(krb5_context context, const char *name, krb5_keytab id)
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{
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struct hdb_data *d;
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const char *db, *mkey;
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d = malloc(sizeof(*d));
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if(d == NULL) {
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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db = name;
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mkey = strstr(name, ":mkey=");
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if(mkey == NULL || mkey[6] == '\0') {
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if(*name == '\0')
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d->dbname = NULL;
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else {
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d->dbname = strdup(name);
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if(d->dbname == NULL) {
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free(d);
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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}
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d->mkey = NULL;
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} else {
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d->dbname = malloc(mkey - db + 1);
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if(d->dbname == NULL) {
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free(d);
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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memmove(d->dbname, db, mkey - db);
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d->dbname[mkey - db] = '\0';
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d->mkey = strdup(mkey + 6);
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if(d->mkey == NULL) {
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free(d->dbname);
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free(d);
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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}
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id->data = d;
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return 0;
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}
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static krb5_error_code KRB5_CALLCONV
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hdb_close(krb5_context context, krb5_keytab id)
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{
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struct hdb_data *d = id->data;
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free(d->dbname);
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free(d->mkey);
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free(d);
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return 0;
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}
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static krb5_error_code KRB5_CALLCONV
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hdb_get_name(krb5_context context,
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krb5_keytab id,
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char *name,
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size_t namesize)
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{
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struct hdb_data *d = id->data;
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snprintf(name, namesize, "%s%s%s",
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d->dbname ? d->dbname : "",
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(d->dbname || d->mkey) ? ":" : "",
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d->mkey ? d->mkey : "");
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return 0;
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}
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/*
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* try to figure out the database (`dbname') and master-key (`mkey')
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* that should be used for `principal'.
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*/
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static krb5_error_code
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find_db (krb5_context context,
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char **dbname,
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char **mkey,
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krb5_const_principal principal)
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{
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krb5_const_realm realm = krb5_principal_get_realm(context, principal);
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krb5_error_code ret;
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struct hdb_dbinfo *head, *dbinfo = NULL;
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*dbname = *mkey = NULL;
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ret = hdb_get_dbinfo(context, &head);
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if (ret)
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return ret;
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while ((dbinfo = hdb_dbinfo_get_next(head, dbinfo)) != NULL) {
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const char *p = hdb_dbinfo_get_realm(context, dbinfo);
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if (p && strcmp (realm, p) == 0) {
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p = hdb_dbinfo_get_dbname(context, dbinfo);
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if (p)
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*dbname = strdup(p);
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p = hdb_dbinfo_get_mkey_file(context, dbinfo);
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if (p)
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*mkey = strdup(p);
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break;
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}
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}
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hdb_free_dbinfo(context, &head);
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if (*dbname == NULL)
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*dbname = strdup(HDB_DEFAULT_DB);
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return 0;
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}
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/*
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* find the keytab entry in `id' for `principal, kvno, enctype' and return
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* it in `entry'. return 0 or an error code
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*/
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static krb5_error_code KRB5_CALLCONV
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hdb_get_entry(krb5_context context,
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krb5_keytab id,
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krb5_const_principal principal,
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krb5_kvno kvno,
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krb5_enctype enctype,
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krb5_keytab_entry *entry)
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{
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hdb_entry_ex ent;
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krb5_error_code ret;
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struct hdb_data *d = id->data;
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const char *dbname = d->dbname;
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const char *mkey = d->mkey;
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char *fdbname = NULL, *fmkey = NULL;
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HDB *db;
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size_t i;
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memset(&ent, 0, sizeof(ent));
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if (dbname == NULL) {
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ret = find_db(context, &fdbname, &fmkey, principal);
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if (ret)
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return ret;
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dbname = fdbname;
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mkey = fmkey;
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}
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ret = hdb_create (context, &db, dbname);
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if (ret)
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goto out2;
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ret = hdb_set_master_keyfile (context, db, mkey);
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if (ret) {
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(*db->hdb_destroy)(context, db);
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goto out2;
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}
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ret = (*db->hdb_open)(context, db, O_RDONLY, 0);
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if (ret) {
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(*db->hdb_destroy)(context, db);
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goto out2;
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}
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ret = hdb_fetch_kvno(context, db, principal,
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HDB_F_DECRYPT|HDB_F_KVNO_SPECIFIED|
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HDB_F_GET_CLIENT|HDB_F_GET_SERVER|HDB_F_GET_KRBTGT,
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0, 0, kvno, &ent);
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if(ret == HDB_ERR_NOENTRY) {
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ret = KRB5_KT_NOTFOUND;
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goto out;
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}else if(ret)
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goto out;
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if(kvno && (krb5_kvno)ent.entry.kvno != kvno) {
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hdb_free_entry(context, &ent);
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ret = KRB5_KT_NOTFOUND;
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goto out;
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}
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if(enctype == 0)
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if(ent.entry.keys.len > 0)
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enctype = ent.entry.keys.val[0].key.keytype;
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ret = KRB5_KT_NOTFOUND;
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for(i = 0; i < ent.entry.keys.len; i++) {
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if(ent.entry.keys.val[i].key.keytype == enctype) {
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krb5_copy_principal(context, principal, &entry->principal);
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entry->vno = ent.entry.kvno;
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krb5_copy_keyblock_contents(context,
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&ent.entry.keys.val[i].key,
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&entry->keyblock);
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ret = 0;
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break;
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}
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}
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hdb_free_entry(context, &ent);
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out:
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(*db->hdb_close)(context, db);
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(*db->hdb_destroy)(context, db);
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out2:
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free(fdbname);
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free(fmkey);
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return ret;
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}
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/*
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* find the keytab entry in `id' for `principal, kvno, enctype' and return
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* it in `entry'. return 0 or an error code
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*/
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static krb5_error_code KRB5_CALLCONV
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hdb_start_seq_get(krb5_context context,
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krb5_keytab id,
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krb5_kt_cursor *cursor)
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{
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krb5_error_code ret;
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struct hdb_cursor *c;
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struct hdb_data *d = id->data;
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const char *dbname = d->dbname;
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const char *mkey = d->mkey;
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HDB *db;
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if (dbname == NULL) {
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/*
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* We don't support enumerating without being told what
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* backend to enumerate on
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*/
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ret = KRB5_KT_NOTFOUND;
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return ret;
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}
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ret = hdb_create (context, &db, dbname);
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if (ret)
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return ret;
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ret = hdb_set_master_keyfile (context, db, mkey);
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if (ret) {
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(*db->hdb_destroy)(context, db);
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return ret;
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}
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ret = (*db->hdb_open)(context, db, O_RDONLY, 0);
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if (ret) {
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(*db->hdb_destroy)(context, db);
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return ret;
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}
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cursor->data = c = malloc (sizeof(*c));
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if(c == NULL){
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(*db->hdb_close)(context, db);
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(*db->hdb_destroy)(context, db);
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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c->db = db;
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c->first = TRUE;
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c->next = TRUE;
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c->key_idx = 0;
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cursor->data = c;
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return ret;
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}
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static int KRB5_CALLCONV
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hdb_next_entry(krb5_context context,
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krb5_keytab id,
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krb5_keytab_entry *entry,
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krb5_kt_cursor *cursor)
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{
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struct hdb_cursor *c = cursor->data;
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krb5_error_code ret;
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memset(entry, 0, sizeof(*entry));
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if (c->first) {
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c->first = FALSE;
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ret = (c->db->hdb_firstkey)(context, c->db,
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HDB_F_DECRYPT|
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HDB_F_GET_CLIENT|HDB_F_GET_SERVER|HDB_F_GET_KRBTGT,
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&c->hdb_entry);
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if (ret == HDB_ERR_NOENTRY)
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return KRB5_KT_END;
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else if (ret)
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return ret;
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if (c->hdb_entry.entry.keys.len == 0)
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hdb_free_entry(context, &c->hdb_entry);
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else
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c->next = FALSE;
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}
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while (c->next) {
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ret = (c->db->hdb_nextkey)(context, c->db,
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HDB_F_DECRYPT|
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HDB_F_GET_CLIENT|HDB_F_GET_SERVER|HDB_F_GET_KRBTGT,
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&c->hdb_entry);
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if (ret == HDB_ERR_NOENTRY)
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return KRB5_KT_END;
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else if (ret)
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return ret;
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/* If no keys on this entry, try again */
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if (c->hdb_entry.entry.keys.len == 0)
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hdb_free_entry(context, &c->hdb_entry);
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else
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c->next = FALSE;
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}
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/*
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* Return next enc type (keytabs are one slot per key, while
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* hdb is one record per principal.
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*/
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ret = krb5_copy_principal(context,
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c->hdb_entry.entry.principal,
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&entry->principal);
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if (ret)
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return ret;
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entry->vno = c->hdb_entry.entry.kvno;
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ret = krb5_copy_keyblock_contents(context,
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&c->hdb_entry.entry.keys.val[c->key_idx].key,
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&entry->keyblock);
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if (ret) {
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krb5_free_principal(context, entry->principal);
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memset(entry, 0, sizeof(*entry));
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return ret;
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}
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c->key_idx++;
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/*
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* Once we get to the end of the list, signal that we want the
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* next entry
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*/
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if ((size_t)c->key_idx == c->hdb_entry.entry.keys.len) {
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hdb_free_entry(context, &c->hdb_entry);
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c->next = TRUE;
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c->key_idx = 0;
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}
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return 0;
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}
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static int KRB5_CALLCONV
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hdb_end_seq_get(krb5_context context,
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krb5_keytab id,
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krb5_kt_cursor *cursor)
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{
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struct hdb_cursor *c = cursor->data;
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if (!c->next)
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hdb_free_entry(context, &c->hdb_entry);
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(c->db->hdb_close)(context, c->db);
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(c->db->hdb_destroy)(context, c->db);
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free(c);
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return 0;
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}
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krb5_kt_ops hdb_kt_ops = {
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"HDB",
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hdb_resolve,
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hdb_get_name,
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hdb_close,
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NULL, /* destroy */
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hdb_get_entry,
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hdb_start_seq_get,
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hdb_next_entry,
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hdb_end_seq_get,
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NULL, /* add */
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NULL, /* remove */
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NULL,
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0
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};
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krb5_kt_ops hdb_get_kt_ops = {
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"HDBGET",
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hdb_resolve,
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hdb_get_name,
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hdb_close,
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NULL,
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hdb_get_entry,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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0
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};
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