several new kerberos related libraries and applications to FreeBSD: o kgetcred(1) allows one to manually get a ticket for a particular service. o kf(1) securily forwards ticket to another host through an authenticated and encrypted stream. o kcc(1) is an umbrella program around klist(1), kswitch(1), kgetcred(1) and other user kerberos operations. klist and kswitch are just symlinks to kcc(1) now. o kswitch(1) allows you to easily switch between kerberos credentials if you're running KCM. o hxtool(1) is a certificate management tool to use with PKINIT. o string2key(1) maps a password into key. o kdigest(8) is a userland tool to access the KDC's digest interface. o kimpersonate(8) creates a "fake" ticket for a service. We also now install manpages for some lirbaries that were not installed before, libheimntlm and libhx509. - The new HEIMDAL version no longer supports Kerberos 4. All users are recommended to switch to Kerberos 5. - Weak ciphers are now disabled by default. To enable DES support (used by telnet(8)), use "allow_weak_crypto" option in krb5.conf. - libtelnet, pam_ksu and pam_krb5 are now compiled with error on warnings disabled due to the function they use (krb5_get_err_text(3)) being deprecated. I plan to work on this next. - Heimdal's KDC now require sqlite to operate. We use the bundled version and install it as libheimsqlite. If some other FreeBSD components will require it in the future we can rename it to libbsdsqlite and use for these components as well. - This is not a latest Heimdal version, the new one was released while I was working on the update. I will update it to 1.5.2 soon, as it fixes some important bugs and security issues.
490 lines
12 KiB
C
490 lines
12 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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* Portions Copyright (c) 2009 Apple Inc. 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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const int hdb_interface_version = HDB_INTERFACE_VERSION;
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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_DB1
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{ HDB_INTERFACE_VERSION, "mit-db:", hdb_mdb_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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{ HDB_INTERFACE_VERSION, "keytab:", hdb_keytab_create},
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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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#ifdef HAVE_SQLITE3
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{ HDB_INTERFACE_VERSION, "sqlite:", hdb_sqlite_create},
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#endif
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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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size_t 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 = (void *)(intptr_t)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 = (void *)(intptr_t)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 = (struct hdb_so_method *) 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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krb5_error_code
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_hdb_keytab2hdb_entry(krb5_context context,
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const krb5_keytab_entry *ktentry,
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hdb_entry_ex *entry)
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{
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entry->entry.kvno = ktentry->vno;
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entry->entry.created_by.time = ktentry->timestamp;
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entry->entry.keys.val = calloc(1, sizeof(entry->entry.keys.val[0]));
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if (entry->entry.keys.val == NULL)
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return ENOMEM;
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entry->entry.keys.len = 1;
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entry->entry.keys.val[0].mkvno = NULL;
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entry->entry.keys.val[0].salt = NULL;
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return krb5_copy_keyblock_contents(context,
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&ktentry->keyblock,
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&entry->entry.keys.val[0].key);
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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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