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diff --git a/servers/slapd/compare.c b/servers/slapd/compare.c
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+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* Portions Copyright (c) 1995 Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of Michigan at Ann Arbor. The name of the University
+ * may not be used to endorse or promote products derived from this
+ * software without specific prior written permission. This software
+ * is provided ``as is'' without express or implied warranty.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+#include <ac/socket.h>
+#include <ac/string.h>
+
+#include "slap.h"
+
+int
+do_compare(
+ Operation *op,
+ SlapReply *rs )
+{
+ struct berval dn = BER_BVNULL;
+ struct berval desc = BER_BVNULL;
+ struct berval value = BER_BVNULL;
+ AttributeAssertion ava = ATTRIBUTEASSERTION_INIT;
+
+ Debug( LDAP_DEBUG_TRACE, "%s do_compare\n",
+ op->o_log_prefix, 0, 0 );
+ /*
+ * Parse the compare request. It looks like this:
+ *
+ * CompareRequest := [APPLICATION 14] SEQUENCE {
+ * entry DistinguishedName,
+ * ava SEQUENCE {
+ * type AttributeType,
+ * value AttributeValue
+ * }
+ * }
+ */
+
+ if ( ber_scanf( op->o_ber, "{m" /*}*/, &dn ) == LBER_ERROR ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_compare: ber_scanf failed\n",
+ op->o_log_prefix, 0, 0 );
+ send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
+ return SLAPD_DISCONNECT;
+ }
+
+ if ( ber_scanf( op->o_ber, "{mm}", &desc, &value ) == LBER_ERROR ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_compare: get ava failed\n",
+ op->o_log_prefix, 0, 0 );
+ send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
+ return SLAPD_DISCONNECT;
+ }
+
+ if ( ber_scanf( op->o_ber, /*{*/ "}" ) == LBER_ERROR ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_compare: ber_scanf failed\n",
+ op->o_log_prefix, 0, 0 );
+ send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
+ return SLAPD_DISCONNECT;
+ }
+
+ if( get_ctrls( op, rs, 1 ) != LDAP_SUCCESS ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_compare: get_ctrls failed\n",
+ op->o_log_prefix, 0, 0 );
+ goto cleanup;
+ }
+
+ rs->sr_err = dnPrettyNormal( NULL, &dn, &op->o_req_dn, &op->o_req_ndn,
+ op->o_tmpmemctx );
+ if( rs->sr_err != LDAP_SUCCESS ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_compare: invalid dn (%s)\n",
+ op->o_log_prefix, dn.bv_val, 0 );
+ send_ldap_error( op, rs, LDAP_INVALID_DN_SYNTAX, "invalid DN" );
+ goto cleanup;
+ }
+
+ Statslog( LDAP_DEBUG_STATS,
+ "%s CMP dn=\"%s\" attr=\"%s\"\n",
+ op->o_log_prefix, op->o_req_dn.bv_val,
+ desc.bv_val, 0, 0 );
+
+ rs->sr_err = slap_bv2ad( &desc, &ava.aa_desc, &rs->sr_text );
+ if( rs->sr_err != LDAP_SUCCESS ) {
+ rs->sr_err = slap_bv2undef_ad( &desc, &ava.aa_desc,
+ &rs->sr_text,
+ SLAP_AD_PROXIED|SLAP_AD_NOINSERT );
+ if( rs->sr_err != LDAP_SUCCESS ) {
+ send_ldap_result( op, rs );
+ goto cleanup;
+ }
+ }
+
+ rs->sr_err = asserted_value_validate_normalize( ava.aa_desc,
+ ava.aa_desc->ad_type->sat_equality,
+ SLAP_MR_EQUALITY|SLAP_MR_VALUE_OF_ASSERTION_SYNTAX,
+ &value, &ava.aa_value, &rs->sr_text, op->o_tmpmemctx );
+ if( rs->sr_err != LDAP_SUCCESS ) {
+ send_ldap_result( op, rs );
+ goto cleanup;
+ }
+
+ op->orc_ava = &ava;
+
+ Debug( LDAP_DEBUG_ARGS,
+ "do_compare: dn (%s) attr (%s) value (%s)\n",
+ op->o_req_dn.bv_val,
+ ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
+
+ op->o_bd = frontendDB;
+ rs->sr_err = frontendDB->be_compare( op, rs );
+
+cleanup:;
+ op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
+ op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
+ if ( !BER_BVISNULL( &ava.aa_value ) ) {
+ op->o_tmpfree( ava.aa_value.bv_val, op->o_tmpmemctx );
+ }
+
+ return rs->sr_err;
+}
+
+int
+fe_op_compare( Operation *op, SlapReply *rs )
+{
+ Entry *entry = NULL;
+ AttributeAssertion *ava = op->orc_ava;
+ BackendDB *bd = op->o_bd;
+
+ if( strcasecmp( op->o_req_ndn.bv_val, LDAP_ROOT_DSE ) == 0 ) {
+ if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
+ send_ldap_result( op, rs );
+ goto cleanup;
+ }
+
+ rs->sr_err = root_dse_info( op->o_conn, &entry, &rs->sr_text );
+ if( rs->sr_err != LDAP_SUCCESS ) {
+ send_ldap_result( op, rs );
+ goto cleanup;
+ }
+
+ } else if ( bvmatch( &op->o_req_ndn, &frontendDB->be_schemandn ) ) {
+ if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
+ send_ldap_result( op, rs );
+ rs->sr_err = 0;
+ goto cleanup;
+ }
+
+ rs->sr_err = schema_info( &entry, &rs->sr_text );
+ if( rs->sr_err != LDAP_SUCCESS ) {
+ send_ldap_result( op, rs );
+ rs->sr_err = 0;
+ goto cleanup;
+ }
+ }
+
+ if( entry ) {
+ rs->sr_err = slap_compare_entry( op, entry, ava );
+ entry_free( entry );
+
+ send_ldap_result( op, rs );
+
+ if( rs->sr_err == LDAP_COMPARE_TRUE ||
+ rs->sr_err == LDAP_COMPARE_FALSE )
+ {
+ rs->sr_err = LDAP_SUCCESS;
+ }
+
+ goto cleanup;
+ }
+
+ /*
+ * We could be serving multiple database backends. Select the
+ * appropriate one, or send a referral to our "referral server"
+ * if we don't hold it.
+ */
+ op->o_bd = select_backend( &op->o_req_ndn, 0 );
+ if ( op->o_bd == NULL ) {
+ rs->sr_ref = referral_rewrite( default_referral,
+ NULL, &op->o_req_dn, LDAP_SCOPE_DEFAULT );
+
+ rs->sr_err = LDAP_REFERRAL;
+ if (!rs->sr_ref) rs->sr_ref = default_referral;
+ op->o_bd = bd;
+ send_ldap_result( op, rs );
+
+ if (rs->sr_ref != default_referral) ber_bvarray_free( rs->sr_ref );
+ rs->sr_err = 0;
+ goto cleanup;
+ }
+
+ /* check restrictions */
+ if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
+ send_ldap_result( op, rs );
+ goto cleanup;
+ }
+
+ /* check for referrals */
+ if( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
+ goto cleanup;
+ }
+
+ if ( SLAP_SHADOW(op->o_bd) && get_dontUseCopy(op) ) {
+ /* don't use shadow copy */
+ send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
+ "copy not used" );
+
+ } else if ( ava->aa_desc == slap_schema.si_ad_entryDN ) {
+ send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
+ "entryDN compare not supported" );
+
+ } else if ( ava->aa_desc == slap_schema.si_ad_subschemaSubentry ) {
+ send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
+ "subschemaSubentry compare not supported" );
+
+#ifndef SLAP_COMPARE_IN_FRONTEND
+ } else if ( ava->aa_desc == slap_schema.si_ad_hasSubordinates
+ && op->o_bd->be_has_subordinates )
+ {
+ int rc, hasSubordinates = LDAP_SUCCESS;
+
+ rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &entry );
+ if ( rc == 0 && entry ) {
+ if ( ! access_allowed( op, entry,
+ ava->aa_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
+ {
+ rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
+
+ } else {
+ rc = rs->sr_err = op->o_bd->be_has_subordinates( op,
+ entry, &hasSubordinates );
+ be_entry_release_r( op, entry );
+ }
+ }
+
+ if ( rc == 0 ) {
+ int asserted;
+
+ asserted = bvmatch( &ava->aa_value, &slap_true_bv )
+ ? LDAP_COMPARE_TRUE : LDAP_COMPARE_FALSE;
+ if ( hasSubordinates == asserted ) {
+ rs->sr_err = LDAP_COMPARE_TRUE;
+
+ } else {
+ rs->sr_err = LDAP_COMPARE_FALSE;
+ }
+
+ } else {
+ /* return error only if "disclose"
+ * is granted on the object */
+ if ( backend_access( op, NULL, &op->o_req_ndn,
+ slap_schema.si_ad_entry,
+ NULL, ACL_DISCLOSE, NULL ) == LDAP_INSUFFICIENT_ACCESS )
+ {
+ rs->sr_err = LDAP_NO_SUCH_OBJECT;
+ }
+ }
+
+ send_ldap_result( op, rs );
+
+ if ( rc == 0 ) {
+ rs->sr_err = LDAP_SUCCESS;
+ }
+
+ } else if ( op->o_bd->be_compare ) {
+ rs->sr_err = op->o_bd->be_compare( op, rs );
+
+#endif /* ! SLAP_COMPARE_IN_FRONTEND */
+ } else {
+ rs->sr_err = SLAP_CB_CONTINUE;
+ }
+
+ if ( rs->sr_err == SLAP_CB_CONTINUE ) {
+ /* do our best to compare that AVA
+ *
+ * NOTE: this code is used only
+ * if SLAP_COMPARE_IN_FRONTEND
+ * is #define'd (it's not by default)
+ * or if op->o_bd->be_compare is NULL.
+ *
+ * FIXME: one potential issue is that
+ * if SLAP_COMPARE_IN_FRONTEND overlays
+ * are not executed for compare. */
+ BerVarray vals = NULL;
+ int rc = LDAP_OTHER;
+
+ rs->sr_err = backend_attribute( op, NULL, &op->o_req_ndn,
+ ava->aa_desc, &vals, ACL_COMPARE );
+ switch ( rs->sr_err ) {
+ default:
+ /* return error only if "disclose"
+ * is granted on the object */
+ if ( backend_access( op, NULL, &op->o_req_ndn,
+ slap_schema.si_ad_entry,
+ NULL, ACL_DISCLOSE, NULL )
+ == LDAP_INSUFFICIENT_ACCESS )
+ {
+ rs->sr_err = LDAP_NO_SUCH_OBJECT;
+ }
+ break;
+
+ case LDAP_SUCCESS:
+ if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
+ SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
+ SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
+ vals, &ava->aa_value, op->o_tmpmemctx ) == 0 )
+ {
+ rs->sr_err = LDAP_COMPARE_TRUE;
+ break;
+
+ } else {
+ rs->sr_err = LDAP_COMPARE_FALSE;
+ }
+ rc = LDAP_SUCCESS;
+ break;
+ }
+
+ send_ldap_result( op, rs );
+
+ if ( rc == 0 ) {
+ rs->sr_err = LDAP_SUCCESS;
+ }
+
+ if ( vals ) {
+ ber_bvarray_free_x( vals, op->o_tmpmemctx );
+ }
+ }
+
+cleanup:;
+ op->o_bd = bd;
+ return rs->sr_err;
+}
+
+int slap_compare_entry(
+ Operation *op,
+ Entry *e,
+ AttributeAssertion *ava )
+{
+ int rc = LDAP_COMPARE_FALSE;
+ Attribute *a;
+
+ if ( ! access_allowed( op, e,
+ ava->aa_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
+ {
+ rc = LDAP_INSUFFICIENT_ACCESS;
+ goto done;
+ }
+
+ if ( get_assert( op ) &&
+ ( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
+ {
+ rc = LDAP_ASSERTION_FAILED;
+ goto done;
+ }
+
+ a = attrs_find( e->e_attrs, ava->aa_desc );
+ if( a == NULL ) {
+ rc = LDAP_NO_SUCH_ATTRIBUTE;
+ goto done;
+ }
+
+ for(;
+ a != NULL;
+ a = attrs_find( a->a_next, ava->aa_desc ))
+ {
+ if (( ava->aa_desc != a->a_desc ) && ! access_allowed( op,
+ e, a->a_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
+ {
+ rc = LDAP_INSUFFICIENT_ACCESS;
+ break;
+ }
+
+ if ( attr_valfind( a,
+ SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
+ SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
+ &ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
+ {
+ rc = LDAP_COMPARE_TRUE;
+ break;
+ }
+ }
+
+done:
+ if( rc != LDAP_COMPARE_TRUE && rc != LDAP_COMPARE_FALSE ) {
+ if ( ! access_allowed( op, e,
+ slap_schema.si_ad_entry, NULL, ACL_DISCLOSE, NULL ) )
+ {
+ rc = LDAP_NO_SUCH_OBJECT;
+ }
+ }
+
+ return rc;
+}
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