461 lines
11 KiB
C
461 lines
11 KiB
C
/*
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* Copyright (c) 1997 - 2008 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 "krb5_locl.h"
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#include "hdb_locl.h"
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif
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/*! @mainpage Heimdal database backend library
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*
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* @section intro Introduction
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*
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* Heimdal libhdb library provides the backend support for Heimdal kdc
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* and kadmind. Its here where plugins for diffrent database engines
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* can be pluged in and extend support for here Heimdal get the
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* principal and policy data from.
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*
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* Example of Heimdal backend are:
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* - Berkeley DB 1.85
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* - Berkeley DB 3.0
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* - Berkeley DB 4.0
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* - New Berkeley DB
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* - LDAP
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*
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*
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* The project web page: http://www.h5l.org/
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*
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*/
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static struct hdb_method methods[] = {
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#if HAVE_DB1 || HAVE_DB3
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{ HDB_INTERFACE_VERSION, "db:", hdb_db_create},
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#endif
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#if HAVE_NDBM
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{ HDB_INTERFACE_VERSION, "ndbm:", hdb_ndbm_create},
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#endif
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#if defined(OPENLDAP) && !defined(OPENLDAP_MODULE)
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{ HDB_INTERFACE_VERSION, "ldap:", hdb_ldap_create},
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{ HDB_INTERFACE_VERSION, "ldapi:", hdb_ldapi_create},
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#endif
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{ HDB_INTERFACE_VERSION, "sqlite:", hdb_sqlite_create},
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{0, NULL, NULL}
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};
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#if HAVE_DB1 || HAVE_DB3
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static struct hdb_method dbmetod =
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{ HDB_INTERFACE_VERSION, "", hdb_db_create };
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#elif defined(HAVE_NDBM)
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static struct hdb_method dbmetod =
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{ HDB_INTERFACE_VERSION, "", hdb_ndbm_create };
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#endif
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krb5_error_code
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hdb_next_enctype2key(krb5_context context,
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const hdb_entry *e,
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krb5_enctype enctype,
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Key **key)
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{
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Key *k;
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for (k = *key ? (*key) + 1 : e->keys.val;
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k < e->keys.val + e->keys.len;
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k++)
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{
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if(k->key.keytype == enctype){
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*key = k;
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return 0;
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}
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}
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krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
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"No next enctype %d for hdb-entry",
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(int)enctype);
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return KRB5_PROG_ETYPE_NOSUPP; /* XXX */
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}
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krb5_error_code
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hdb_enctype2key(krb5_context context,
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hdb_entry *e,
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krb5_enctype enctype,
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Key **key)
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{
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*key = NULL;
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return hdb_next_enctype2key(context, e, enctype, key);
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}
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void
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hdb_free_key(Key *key)
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{
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memset(key->key.keyvalue.data,
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0,
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key->key.keyvalue.length);
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free_Key(key);
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free(key);
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}
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krb5_error_code
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hdb_lock(int fd, int operation)
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{
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int i, code = 0;
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for(i = 0; i < 3; i++){
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code = flock(fd, (operation == HDB_RLOCK ? LOCK_SH : LOCK_EX) | LOCK_NB);
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if(code == 0 || errno != EWOULDBLOCK)
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break;
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sleep(1);
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}
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if(code == 0)
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return 0;
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if(errno == EWOULDBLOCK)
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return HDB_ERR_DB_INUSE;
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return HDB_ERR_CANT_LOCK_DB;
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}
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krb5_error_code
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hdb_unlock(int fd)
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{
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int code;
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code = flock(fd, LOCK_UN);
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if(code)
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return 4711 /* XXX */;
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return 0;
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}
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void
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hdb_free_entry(krb5_context context, hdb_entry_ex *ent)
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{
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int i;
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if (ent->free_entry)
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(*ent->free_entry)(context, ent);
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for(i = 0; i < ent->entry.keys.len; ++i) {
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Key *k = &ent->entry.keys.val[i];
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memset (k->key.keyvalue.data, 0, k->key.keyvalue.length);
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}
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free_hdb_entry(&ent->entry);
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}
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krb5_error_code
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hdb_foreach(krb5_context context,
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HDB *db,
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unsigned flags,
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hdb_foreach_func_t func,
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void *data)
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{
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krb5_error_code ret;
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hdb_entry_ex entry;
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ret = db->hdb_firstkey(context, db, flags, &entry);
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if (ret == 0)
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krb5_clear_error_message(context);
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while(ret == 0){
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ret = (*func)(context, db, &entry, data);
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hdb_free_entry(context, &entry);
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if(ret == 0)
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ret = db->hdb_nextkey(context, db, flags, &entry);
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}
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if(ret == HDB_ERR_NOENTRY)
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ret = 0;
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return ret;
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}
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krb5_error_code
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hdb_check_db_format(krb5_context context, HDB *db)
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{
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krb5_data tag;
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krb5_data version;
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krb5_error_code ret, ret2;
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unsigned ver;
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int foo;
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ret = db->hdb_lock(context, db, HDB_RLOCK);
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if (ret)
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return ret;
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tag.data = HDB_DB_FORMAT_ENTRY;
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tag.length = strlen(tag.data);
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ret = (*db->hdb__get)(context, db, tag, &version);
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ret2 = db->hdb_unlock(context, db);
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if(ret)
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return ret;
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if (ret2)
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return ret2;
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foo = sscanf(version.data, "%u", &ver);
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krb5_data_free (&version);
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if (foo != 1)
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return HDB_ERR_BADVERSION;
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if(ver != HDB_DB_FORMAT)
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return HDB_ERR_BADVERSION;
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return 0;
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}
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krb5_error_code
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hdb_init_db(krb5_context context, HDB *db)
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{
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krb5_error_code ret, ret2;
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krb5_data tag;
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krb5_data version;
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char ver[32];
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ret = hdb_check_db_format(context, db);
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if(ret != HDB_ERR_NOENTRY)
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return ret;
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ret = db->hdb_lock(context, db, HDB_WLOCK);
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if (ret)
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return ret;
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tag.data = HDB_DB_FORMAT_ENTRY;
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tag.length = strlen(tag.data);
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snprintf(ver, sizeof(ver), "%u", HDB_DB_FORMAT);
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version.data = ver;
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version.length = strlen(version.data) + 1; /* zero terminated */
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ret = (*db->hdb__put)(context, db, 0, tag, version);
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ret2 = db->hdb_unlock(context, db);
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if (ret) {
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if (ret2)
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krb5_clear_error_message(context);
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return ret;
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}
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return ret2;
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}
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#ifdef HAVE_DLOPEN
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/*
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* Load a dynamic backend from /usr/heimdal/lib/hdb_NAME.so,
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* looking for the hdb_NAME_create symbol.
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*/
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static const struct hdb_method *
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find_dynamic_method (krb5_context context,
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const char *filename,
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const char **rest)
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{
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static struct hdb_method method;
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struct hdb_so_method *mso;
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char *prefix, *path, *symbol;
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const char *p;
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void *dl;
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size_t len;
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p = strchr(filename, ':');
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/* if no prefix, don't know what module to load, just ignore it */
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if (p == NULL)
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return NULL;
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len = p - filename;
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*rest = filename + len + 1;
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prefix = malloc(len + 1);
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if (prefix == NULL)
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krb5_errx(context, 1, "out of memory");
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strlcpy(prefix, filename, len + 1);
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if (asprintf(&path, LIBDIR "/hdb_%s.so", prefix) == -1)
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krb5_errx(context, 1, "out of memory");
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#ifndef RTLD_NOW
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#define RTLD_NOW 0
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#endif
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#ifndef RTLD_GLOBAL
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#define RTLD_GLOBAL 0
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#endif
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dl = dlopen(path, RTLD_NOW | RTLD_GLOBAL);
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if (dl == NULL) {
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krb5_warnx(context, "error trying to load dynamic module %s: %s\n",
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path, dlerror());
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free(prefix);
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free(path);
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return NULL;
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}
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if (asprintf(&symbol, "hdb_%s_interface", prefix) == -1)
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krb5_errx(context, 1, "out of memory");
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mso = dlsym(dl, symbol);
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if (mso == NULL) {
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krb5_warnx(context, "error finding symbol %s in %s: %s\n",
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symbol, path, dlerror());
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dlclose(dl);
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free(symbol);
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free(prefix);
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free(path);
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return NULL;
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}
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free(path);
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free(symbol);
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if (mso->version != HDB_INTERFACE_VERSION) {
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krb5_warnx(context,
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"error wrong version in shared module %s "
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"version: %d should have been %d\n",
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prefix, mso->version, HDB_INTERFACE_VERSION);
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dlclose(dl);
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free(prefix);
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return NULL;
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}
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if (mso->create == NULL) {
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krb5_errx(context, 1,
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"no entry point function in shared mod %s ",
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prefix);
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dlclose(dl);
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free(prefix);
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return NULL;
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}
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method.create = mso->create;
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method.prefix = prefix;
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return &method;
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}
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#endif /* HAVE_DLOPEN */
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/*
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* find the relevant method for `filename', returning a pointer to the
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* rest in `rest'.
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* return NULL if there's no such method.
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*/
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static const struct hdb_method *
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find_method (const char *filename, const char **rest)
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{
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const struct hdb_method *h;
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for (h = methods; h->prefix != NULL; ++h) {
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if (strncmp (filename, h->prefix, strlen(h->prefix)) == 0) {
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*rest = filename + strlen(h->prefix);
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return h;
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}
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}
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#if defined(HAVE_DB1) || defined(HAVE_DB3) || defined(HAVE_NDBM)
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if (strncmp(filename, "/", 1) == 0
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|| strncmp(filename, "./", 2) == 0
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|| strncmp(filename, "../", 3) == 0)
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{
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*rest = filename;
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return &dbmetod;
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}
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#endif
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return NULL;
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}
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krb5_error_code
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hdb_list_builtin(krb5_context context, char **list)
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{
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const struct hdb_method *h;
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size_t len = 0;
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char *buf = NULL;
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for (h = methods; h->prefix != NULL; ++h) {
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if (h->prefix[0] == '\0')
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continue;
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len += strlen(h->prefix) + 2;
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}
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len += 1;
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buf = malloc(len);
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if (buf == 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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buf[0] = '\0';
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for (h = methods; h->prefix != NULL; ++h) {
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if (h != methods)
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strlcat(buf, ", ", len);
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strlcat(buf, h->prefix, len);
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}
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*list = buf;
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return 0;
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}
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/**
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* Create a handle for a Kerberos database
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*
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* Create a handle for a Kerberos database backend specified by a
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* filename. Doesn't create a file if its doesn't exists, you have to
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* use O_CREAT to tell the backend to create the file.
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*/
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krb5_error_code
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hdb_create(krb5_context context, HDB **db, const char *filename)
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{
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const struct hdb_method *h;
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const char *residual;
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krb5_error_code ret;
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struct krb5_plugin *list = NULL, *e;
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if(filename == NULL)
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filename = HDB_DEFAULT_DB;
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krb5_add_et_list(context, initialize_hdb_error_table_r);
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h = find_method (filename, &residual);
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if (h == NULL) {
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ret = _krb5_plugin_find(context, PLUGIN_TYPE_DATA, "hdb", &list);
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if(ret == 0 && list != NULL) {
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for (e = list; e != NULL; e = _krb5_plugin_get_next(e)) {
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h = _krb5_plugin_get_symbol(e);
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if (strncmp (filename, h->prefix, strlen(h->prefix)) == 0
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&& h->interface_version == HDB_INTERFACE_VERSION) {
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residual = filename + strlen(h->prefix);
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break;
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}
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}
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if (e == NULL) {
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h = NULL;
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_krb5_plugin_free(list);
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}
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}
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}
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#ifdef HAVE_DLOPEN
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if (h == NULL)
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h = find_dynamic_method (context, filename, &residual);
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#endif
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if (h == NULL)
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krb5_errx(context, 1, "No database support for %s", filename);
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return (*h->create)(context, db, residual);
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}
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