org.springframework.security.afterinvocation.AclEntryAfterInvocationProvider Maven / Gradle / Ivy

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spring-security-acl
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/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed 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.springframework.security.afterinvocation;

import org.springframework.security.AccessDeniedException;
import org.springframework.security.SpringSecurityMessageSource;
import org.springframework.security.Authentication;
import org.springframework.security.ConfigAttribute;
import org.springframework.security.ConfigAttributeDefinition;

import org.springframework.security.acls.AclService;
import org.springframework.security.acls.Permission;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.context.MessageSource;
import org.springframework.context.MessageSourceAware;
import org.springframework.context.support.MessageSourceAccessor;

import java.util.Iterator;


/**
 * Given a domain object instance returned from a secure object invocation, ensures the principal has
 * appropriate permission as defined by the {@link AclService}.
 * 
 * The AclService is used to retrieve the access control list (ACL) permissions associated with a
 * domain object instance for the current Authentication object.
 * 

 * This after invocation provider will fire if any  {@link ConfigAttribute#getAttribute()} matches the {@link
 * #processConfigAttribute}. The provider will then lookup the ACLs from the AclService and ensure the
 * principal is {@link org.springframework.security.acls.Acl#isGranted(org.springframework.security.acls.Permission[],
   org.springframework.security.acls.sid.Sid[], boolean) Acl.isGranted(Permission[], Sid[], boolean)}
 * when presenting the {@link #requirePermission} array to that method.
 * 

 * Often users will setup an AclEntryAfterInvocationProvider with a {@link
 * #processConfigAttribute} of AFTER_ACL_READ and a {@link #requirePermission} of
 * BasePermission.READ. These are also the defaults.
 * 

 * If the principal does not have sufficient permissions, an AccessDeniedException will be thrown.
 * 

 * If the provided returnedObject is null, permission will always be granted and
 * null will be returned.
 * 
 * All comparisons and prefixes are case sensitive.
 */
public class AclEntryAfterInvocationProvider extends AbstractAclProvider implements MessageSourceAware {
    //~ Static fields/initializers =====================================================================================

    protected static final Log logger = LogFactory.getLog(AclEntryAfterInvocationProvider.class);

    //~ Instance fields ================================================================================================

    protected MessageSourceAccessor messages = SpringSecurityMessageSource.getAccessor();

    //~ Constructors ===================================================================================================

    public AclEntryAfterInvocationProvider(AclService aclService, Permission[] requirePermission) {
        super(aclService, "AFTER_ACL_READ", requirePermission);
    }

    //~ Methods ========================================================================================================

    public Object decide(Authentication authentication, Object object, ConfigAttributeDefinition config,
            Object returnedObject) throws AccessDeniedException {

        Iterator iter = config.getConfigAttributes().iterator();

        if (returnedObject == null) {
            // AclManager interface contract prohibits nulls
            // As they have permission to null/nothing, grant access
            if (logger.isDebugEnabled()) {
                logger.debug("Return object is null, skipping");
            }

            return null;
        }

        if (!getProcessDomainObjectClass().isAssignableFrom(returnedObject.getClass())) {
            if (logger.isDebugEnabled()) {
                logger.debug("Return object is not applicable for this provider, skipping");
            }

            return returnedObject;
        }        

        while (iter.hasNext()) {
            ConfigAttribute attr = (ConfigAttribute) iter.next();

            if (!this.supports(attr)) {
                continue;
            }
            // Need to make an access decision on this invocation

            if (hasPermission(authentication, returnedObject)) {
                return returnedObject;
            }

            logger.debug("Denying access");

            throw new AccessDeniedException(messages.getMessage("BasicAclEntryAfterInvocationProvider.noPermission",
                    new Object[] {authentication.getName(), returnedObject},
                    "Authentication {0} has NO permissions to the domain object {1}"));
        }

        return returnedObject;
    }

    public void setMessageSource(MessageSource messageSource) {
        this.messages = new MessageSourceAccessor(messageSource);
    }
}