| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.directory.server.core.authz.support; |
| |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| |
| import org.apache.directory.api.ldap.aci.ACITuple; |
| import org.apache.directory.api.ldap.model.constants.SchemaConstants; |
| import org.apache.directory.api.ldap.model.entry.Entry; |
| import org.apache.directory.api.ldap.model.exception.LdapException; |
| import org.apache.directory.api.ldap.model.exception.LdapNoPermissionException; |
| import org.apache.directory.api.ldap.model.schema.SchemaManager; |
| import org.apache.directory.server.core.api.CoreSession; |
| import org.apache.directory.server.core.api.event.Evaluator; |
| import org.apache.directory.server.core.api.event.ExpressionEvaluator; |
| import org.apache.directory.server.core.api.interceptor.context.LookupOperationContext; |
| import org.apache.directory.server.core.api.subtree.SubtreeEvaluator; |
| import org.apache.directory.server.core.api.subtree.RefinementEvaluator; |
| import org.apache.directory.server.core.api.subtree.RefinementLeafEvaluator; |
| |
| |
| /** |
| * An implementation of Access Control Decision Function (18.8, X.501). |
| * <br/> |
| * This engine simply filters the collection of tuples using the following |
| * {@link ACITupleFilter}s sequentially: |
| * <ol> |
| * <li>{@link RelatedUserClassFilter}</li> |
| * <li>{@link RelatedProtectedItemFilter}</li> |
| * <li>{@link MaxValueCountFilter}</li> |
| * <li>{@link MaxImmSubFilter}</li> |
| * <li>{@link RestrictedByFilter}</li> |
| * <li>{@link MicroOperationFilter}</li> |
| * <li>{@link HighestPrecedenceFilter}</li> |
| * <li>{@link MostSpecificUserClassFilter}</li> |
| * <li>{@link MostSpecificProtectedItemFilter}</li> |
| * </ol> |
| * <br/> |
| * Operation is determined to be permitted if and only if there is at least one |
| * tuple left and all of them grants the access. (18.8.4. X.501) |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class ACDFEngine |
| { |
| private final ACITupleFilter[] filters; |
| |
| |
| /** |
| * Creates a new instance. |
| * |
| * @param schemaManager The server schemaManager |
| * |
| * @throws LdapException if failed to initialize internal components |
| */ |
| public ACDFEngine( SchemaManager schemaManager ) |
| { |
| Evaluator entryEvaluator = new ExpressionEvaluator( schemaManager ); |
| SubtreeEvaluator subtreeEvaluator = new SubtreeEvaluator( schemaManager ); |
| RefinementEvaluator refinementEvaluator = new RefinementEvaluator( new RefinementLeafEvaluator( schemaManager ) ); |
| |
| filters = new ACITupleFilter[] |
| { |
| new RelatedUserClassFilter( subtreeEvaluator ), |
| new RelatedProtectedItemFilter( refinementEvaluator, entryEvaluator, schemaManager ), |
| new MaxValueCountFilter(), |
| new MaxImmSubFilter( schemaManager ), |
| new RestrictedByFilter(), |
| new MicroOperationFilter(), |
| new HighestPrecedenceFilter(), |
| new MostSpecificUserClassFilter(), |
| new MostSpecificProtectedItemFilter() }; |
| } |
| |
| |
| /** |
| * Checks the user with the specified name can access the specified resource |
| * (entry, attribute type, or attribute value) and throws {@link LdapNoPermissionException} |
| * if the user doesn't have any permission to perform the specified grants. |
| * |
| * @param aciContext the container for ACI items |
| * @throws LdapException if failed to evaluate ACI items |
| */ |
| public void checkPermission( AciContext aciContext ) throws LdapException |
| { |
| if ( !hasPermission( aciContext ) ) |
| { |
| throw new LdapNoPermissionException(); |
| } |
| } |
| |
| |
| /** |
| * Returns <tt>true</tt> if the user with the specified name can access the specified resource |
| * (entry, attribute type, or attribute value) and throws {@link org.apache.directory.api.ldap.model.exception.LdapNoPermissionException} |
| * if the user doesn't have any permission to perform the specified grants. |
| * |
| * @param aciContext the container for ACI items |
| * @throws org.apache.directory.api.ldap.model.exception.LdapException if failed to evaluate ACI items |
| */ |
| public boolean hasPermission( AciContext aciContext ) throws LdapException |
| { |
| if ( aciContext.getEntryDn() == null ) |
| { |
| throw new IllegalArgumentException( "entryName" ); |
| } |
| |
| CoreSession session = aciContext.getOperationContext().getSession(); |
| LookupOperationContext lookupContext = new LookupOperationContext( session, aciContext.getUserDn(), |
| SchemaConstants.ALL_ATTRIBUTES_ARRAY ); |
| Entry userEntry = session.getDirectoryService().getPartitionNexus().lookup( lookupContext ); |
| |
| // Determine the scope of the requested operation. |
| OperationScope scope; |
| |
| if ( aciContext.getAttributeType() == null ) |
| { |
| scope = OperationScope.ENTRY; |
| } |
| else if ( aciContext.getAttrValue() == null ) |
| { |
| scope = OperationScope.ATTRIBUTE_TYPE; |
| } |
| else |
| { |
| scope = OperationScope.ATTRIBUTE_TYPE_AND_VALUE; |
| } |
| |
| // Clone aciTuples in case it is unmodifiable. |
| aciContext.setAciTuples( new ArrayList<ACITuple>( aciContext.getAciTuples() ) ); |
| |
| // Filter unrelated and invalid tuples |
| for ( ACITupleFilter filter : filters ) |
| { |
| if ( aciContext.getAciTuples().size() == 0 ) |
| { |
| // No need to continue filtering |
| return false; |
| } |
| |
| Collection<ACITuple> aciTuples = filter.filter( aciContext, scope, userEntry ); |
| aciContext.setAciTuples( aciTuples ); |
| } |
| |
| // Deny access if no tuples left. |
| if ( aciContext.getAciTuples().size() == 0 ) |
| { |
| return false; |
| } |
| |
| // Grant access if and only if one or more tuples remain and |
| // all grant access. Otherwise deny access. |
| for ( ACITuple tuple : aciContext.getAciTuples() ) |
| { |
| if ( !tuple.isGrant() ) |
| { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| } |