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474 lines
10 KiB
C
474 lines
10 KiB
C
/* passwd.c - password extended operation routines */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2004 The OpenLDAP Foundation.
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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 only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/krb.h>
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#include <ac/socket.h>
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#include <ac/string.h>
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#include <ac/unistd.h>
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#include "slap.h"
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#include <lber_pvt.h>
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#include <lutil.h>
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static const char *defhash[] = {
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#ifdef LUTIL_SHA1_BYTES
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"{SSHA}",
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#else
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"{SMD5}",
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#endif
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NULL
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};
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int passwd_extop(
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Operation *op,
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SlapReply *rs )
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{
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struct berval id = {0, NULL}, hash, *rsp = NULL;
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req_pwdexop_s *qpw = &op->oq_pwdexop;
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Modifications *ml;
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Operation op2;
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slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
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slap_callback cb2 = { NULL, slap_replog_cb, NULL, NULL };
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int i, nhash;
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char **hashes;
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int rc;
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cb2.sc_next = &cb;
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assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
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if( op->o_dn.bv_len == 0 ) {
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rs->sr_text = "only authenticated users may change passwords";
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return LDAP_STRONG_AUTH_REQUIRED;
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}
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qpw->rs_old.bv_val = NULL;
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qpw->rs_new.bv_val = NULL;
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qpw->rs_mods = NULL;
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qpw->rs_modtail = NULL;
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rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id, &qpw->rs_old,
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&qpw->rs_new, &rs->sr_text );
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if ( rs->sr_err != LDAP_SUCCESS ) {
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return rs->sr_err;
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}
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if ( id.bv_len ) {
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ber_dupbv_x( &op->o_req_dn, &id, op->o_tmpmemctx );
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/* ndn is in tmpmem, so we don't need to free it */
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rs->sr_err = dnNormalize( 0, NULL, NULL, &id, &op->o_req_ndn, op->o_tmpmemctx );
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if ( rs->sr_err != LDAP_SUCCESS ) {
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rs->sr_text = "Invalid DN";
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rc = rs->sr_err;
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goto error_return;
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}
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op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
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} else {
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ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
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ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
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ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
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op->o_bd = op->o_conn->c_authz_backend;
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ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
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}
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if( op->o_bd == NULL ) {
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#ifdef HAVE_CYRUS_SASL
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rc = slap_sasl_setpass( op, rs );
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#else
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rs->sr_text = "no authz backend";
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rc = LDAP_OTHER;
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#endif
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goto error_return;
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}
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if ( op->o_req_ndn.bv_len == 0 ) {
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rs->sr_text = "no password is associated with the Root DSE";
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rc = LDAP_UNWILLING_TO_PERFORM;
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goto error_return;
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}
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if (backend_check_restrictions( op, rs,
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(struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
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rc = rs->sr_err;
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goto error_return;
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}
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#ifndef SLAPD_MULTIMASTER
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/* This does not apply to multi-master case */
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if(!( !SLAP_SHADOW( op->o_bd ) || be_isupdate( op ))) {
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/* we SHOULD return a referral in this case */
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BerVarray defref = op->o_bd->be_update_refs
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? op->o_bd->be_update_refs : default_referral;
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if( defref != NULL ) {
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rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
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NULL, NULL, LDAP_SCOPE_DEFAULT );
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if(rs->sr_ref) {
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rs->sr_flags |= REP_REF_MUSTBEFREED;
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} else {
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rs->sr_ref = defref;
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}
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rc = LDAP_REFERRAL;
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goto error_return;
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}
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rs->sr_text = "shadow context; no update referral";
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rc = LDAP_UNWILLING_TO_PERFORM;
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goto error_return;
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}
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#endif /* !SLAPD_MULTIMASTER */
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/* generate a new password if none was provided */
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if ( qpw->rs_new.bv_len == 0 ) {
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slap_passwd_generate( &qpw->rs_new );
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if ( qpw->rs_new.bv_len ) {
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rsp = slap_passwd_return( &qpw->rs_new );
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}
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}
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if ( qpw->rs_new.bv_len == 0 ) {
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rs->sr_text = "password generation failed";
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rc = LDAP_OTHER;
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goto error_return;
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}
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/* Give the backend a chance to handle this itself */
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if ( op->o_bd->be_extended ) {
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rs->sr_err = op->o_bd->be_extended( op, rs );
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if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
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rs->sr_err != SLAP_CB_CONTINUE ) {
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rc = rs->sr_err;
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goto error_return;
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}
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}
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/* The backend didn't handle it, so try it here */
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if( op->o_bd && !op->o_bd->be_modify ) {
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rs->sr_text = "operation not supported for current user";
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rc = LDAP_UNWILLING_TO_PERFORM;
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goto error_return;
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}
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ml = ch_malloc( sizeof(Modifications) );
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if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
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if ( default_passwd_hash ) {
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for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
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hashes = default_passwd_hash;
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} else {
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nhash = 1;
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hashes = (char **)defhash;
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}
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ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
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for ( i=0; hashes[i]; i++ ) {
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slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
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if ( hash.bv_len == 0 ) {
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if ( !rs->sr_text ) {
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rs->sr_text = "password hash failed";
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}
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break;
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}
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ml->sml_values[i] = hash;
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}
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ml->sml_values[i].bv_val = NULL;
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ml->sml_nvalues = NULL;
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ml->sml_desc = slap_schema.si_ad_userPassword;
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ml->sml_op = LDAP_MOD_REPLACE;
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ml->sml_next = qpw->rs_mods;
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qpw->rs_mods = ml;
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if ( hashes[i] ) {
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rs->sr_err = LDAP_OTHER;
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} else {
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op2 = *op;
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op2.o_tag = LDAP_REQ_MODIFY;
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op2.o_callback = &cb2;
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op2.orm_modlist = qpw->rs_mods;
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cb2.sc_private = qpw; /* let Modify know this was pwdMod,
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* if it cares... */
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rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
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NULL, 0, 1 );
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if ( rs->sr_err == LDAP_SUCCESS ) {
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rs->sr_err = op2.o_bd->be_modify( &op2, rs );
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/* FIXME: in case it got rewritten... */
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op->o_req_dn = op2.o_req_dn;
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op->o_req_ndn = op2.o_req_ndn;
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}
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if ( rs->sr_err == LDAP_SUCCESS ) {
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rs->sr_rspdata = rsp;
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} else if ( rsp ) {
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ber_bvfree( rsp );
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}
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}
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slap_mods_free( qpw->rs_mods );
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if ( rsp ) {
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free( qpw->rs_new.bv_val );
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}
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rc = rs->sr_err;
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error_return:;
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if ( !BER_BVISNULL( &op->o_req_dn ) ) {
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op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
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}
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if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
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op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
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}
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return rc;
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}
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int slap_passwd_parse( struct berval *reqdata,
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struct berval *id,
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struct berval *oldpass,
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struct berval *newpass,
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const char **text )
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{
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int rc = LDAP_SUCCESS;
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ber_tag_t tag;
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ber_len_t len = -1;
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BerElementBuffer berbuf;
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BerElement *ber = (BerElement *)&berbuf;
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if( reqdata == NULL ) {
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return LDAP_SUCCESS;
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}
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if( reqdata->bv_len == 0 ) {
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*text = "empty request data field";
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return LDAP_PROTOCOL_ERROR;
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}
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/* ber_init2 uses reqdata directly, doesn't allocate new buffers */
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ber_init2( ber, reqdata, 0 );
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tag = ber_scanf( ber, "{" /*}*/ );
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if( tag == LBER_ERROR ) {
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Debug( LDAP_DEBUG_TRACE,
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"slap_passwd_parse: decoding error\n", 0, 0, 0 );
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rc = LDAP_PROTOCOL_ERROR;
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goto done;
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}
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tag = ber_peek_tag( ber, &len );
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if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
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if( id == NULL ) {
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Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
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0, 0, 0 );
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*text = "user must change own password";
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rc = LDAP_UNWILLING_TO_PERFORM;
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goto done;
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}
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tag = ber_scanf( ber, "m", id );
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if( tag == LBER_ERROR ) {
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Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
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0, 0, 0 );
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goto decoding_error;
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}
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tag = ber_peek_tag( ber, &len);
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}
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if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
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if( oldpass == NULL ) {
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Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
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0, 0, 0 );
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*text = "use bind to verify old password";
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rc = LDAP_UNWILLING_TO_PERFORM;
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goto done;
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}
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tag = ber_scanf( ber, "m", oldpass );
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if( tag == LBER_ERROR ) {
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Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
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0, 0, 0 );
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goto decoding_error;
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}
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tag = ber_peek_tag( ber, &len );
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}
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if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
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if( newpass == NULL ) {
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Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
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0, 0, 0 );
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*text = "user specified passwords disallowed";
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rc = LDAP_UNWILLING_TO_PERFORM;
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goto done;
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}
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tag = ber_scanf( ber, "m", newpass );
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if( tag == LBER_ERROR ) {
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Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
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0, 0, 0 );
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goto decoding_error;
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}
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tag = ber_peek_tag( ber, &len );
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}
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if( len != 0 ) {
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decoding_error:
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Debug( LDAP_DEBUG_TRACE,
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"slap_passwd_parse: decoding error, len=%ld\n",
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(long) len, 0, 0 );
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*text = "data decoding error";
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rc = LDAP_PROTOCOL_ERROR;
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}
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done:
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return rc;
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}
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struct berval * slap_passwd_return(
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struct berval *cred )
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{
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int rc;
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struct berval *bv = NULL;
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BerElementBuffer berbuf;
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/* opaque structure, size unknown but smaller than berbuf */
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BerElement *ber = (BerElement *)&berbuf;
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assert( cred != NULL );
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Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
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(long) cred->bv_len, 0, 0 );
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ber_init_w_nullc( ber, LBER_USE_DER );
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rc = ber_printf( ber, "{tON}",
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LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
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if( rc >= 0 ) {
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(void) ber_flatten( ber, &bv );
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}
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ber_free_buf( ber );
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return bv;
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}
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int
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slap_passwd_check(
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Connection *conn,
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Attribute *a,
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struct berval *cred,
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const char **text )
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{
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int result = 1;
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struct berval *bv;
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#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
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ldap_pvt_thread_mutex_lock( &passwd_mutex );
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#ifdef SLAPD_SPASSWD
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lutil_passwd_sasl_conn = conn->c_sasl_authctx;
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#endif
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#endif
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for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
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if( !lutil_passwd( bv, cred, NULL, text ) ) {
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result = 0;
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break;
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}
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}
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#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
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#ifdef SLAPD_SPASSWD
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lutil_passwd_sasl_conn = NULL;
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#endif
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ldap_pvt_thread_mutex_unlock( &passwd_mutex );
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#endif
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return result;
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}
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void
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slap_passwd_generate( struct berval *pass )
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{
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Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
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pass->bv_val = NULL;
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pass->bv_len = 0;
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/*
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* generate passwords of only 8 characters as some getpass(3)
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* implementations truncate at 8 characters.
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*/
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lutil_passwd_generate( pass, 8 );
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}
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void
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slap_passwd_hash_type(
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struct berval * cred,
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struct berval * new,
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char *hash,
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const char **text )
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{
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new->bv_len = 0;
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new->bv_val = NULL;
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assert( hash );
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#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
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ldap_pvt_thread_mutex_lock( &passwd_mutex );
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#endif
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lutil_passwd_hash( cred , hash, new, text );
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#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
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ldap_pvt_thread_mutex_unlock( &passwd_mutex );
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#endif
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}
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void
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slap_passwd_hash(
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struct berval * cred,
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struct berval * new,
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const char **text )
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{
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char *hash = NULL;
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if ( default_passwd_hash ) {
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hash = default_passwd_hash[0];
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}
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if ( !hash ) {
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hash = (char *)defhash[0];
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}
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slap_passwd_hash_type( cred, new, hash, text );
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}
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