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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.acegisecurity.vote;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Iterator;
import org.acegisecurity.Authentication;
import org.acegisecurity.AuthorizationServiceException;
import org.acegisecurity.ConfigAttribute;
import org.acegisecurity.ConfigAttributeDefinition;
import org.acegisecurity.acls.Acl;
import org.acegisecurity.acls.AclService;
import org.acegisecurity.acls.NotFoundException;
import org.acegisecurity.acls.Permission;
import org.acegisecurity.acls.objectidentity.ObjectIdentity;
import org.acegisecurity.acls.objectidentity.ObjectIdentityRetrievalStrategy;
import org.acegisecurity.acls.objectidentity.ObjectIdentityRetrievalStrategyImpl;
import org.acegisecurity.acls.sid.Sid;
import org.acegisecurity.acls.sid.SidRetrievalStrategy;
import org.acegisecurity.acls.sid.SidRetrievalStrategyImpl;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.Assert;
/**
* Given a domain object instance passed as a method argument, ensures the principal has appropriate permission
* as indicated 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.
* The voter will vote if any {@link ConfigAttribute#getAttribute()} matches the {@link
* #processConfigAttribute}. The provider will then locate the first method argument of type {@link
* #processDomainObjectClass}. Assuming that method argument is non-null, the provider will then lookup the ACLs from
* the AclManager and ensure the principal is {@link Acl#isGranted(org.acegisecurity.acls.Permission[],
* org.acegisecurity.acls.sid.Sid[], boolean)} when presenting the {@link #requirePermission} array to that method.
* If the method argument is null, the voter will abstain from voting. If the method argument
* could not be found, an {@link org.acegisecurity.AuthorizationServiceException} will be thrown.
* In practical terms users will typically setup a number of AclEntryVoters. Each will have a
* different {@link #processDomainObjectClass}, {@link #processConfigAttribute} and {@link #requirePermission}
* combination. For example, a small application might employ the following instances of AclEntryVoter:
*
* - Process domain object class
BankAccount, configuration attribute
* VOTE_ACL_BANK_ACCONT_READ, require permission BasePermission.READ
* - Process domain object class
BankAccount, configuration attribute
* VOTE_ACL_BANK_ACCOUNT_WRITE, require permission list BasePermission.WRITE and
* BasePermission.CREATE (allowing the principal to have either of these two permissions
* - Process domain object class
Customer, configuration attribute
* VOTE_ACL_CUSTOMER_READ, require permission BasePermission.READ
* - Process domain object class
Customer, configuration attribute
* VOTE_ACL_CUSTOMER_WRITE, require permission list BasePermission.WRITE and
* BasePermission.CREATE
*
* Alternatively, you could have used a common superclass or interface for the {@link #processDomainObjectClass}
* if both BankAccount and Customer had common parents.
* If the principal does not have sufficient permissions, the voter will vote to deny access.
* All comparisons and prefixes are case sensitive.
*
* @author Ben Alex
* @version $Id: AclEntryVoter.java 1784 2007-02-24 21:00:24Z luke_t $
*/
public class AclEntryVoter extends AbstractAclVoter {
//~ Static fields/initializers =====================================================================================
private static final Log logger = LogFactory.getLog(AclEntryVoter.class);
//~ Instance fields ================================================================================================
private AclService aclService;
private ObjectIdentityRetrievalStrategy objectIdentityRetrievalStrategy = new ObjectIdentityRetrievalStrategyImpl();
private SidRetrievalStrategy sidRetrievalStrategy = new SidRetrievalStrategyImpl();
private String internalMethod;
private String processConfigAttribute;
private Permission[] requirePermission;
//~ Constructors ===================================================================================================
public AclEntryVoter(AclService aclService, String processConfigAttribute, Permission[] requirePermission) {
Assert.notNull(processConfigAttribute, "A processConfigAttribute is mandatory");
Assert.notNull(aclService, "An AclService is mandatory");
if ((requirePermission == null) || (requirePermission.length == 0)) {
throw new IllegalArgumentException("One or more requirePermission entries is mandatory");
}
this.aclService = aclService;
this.processConfigAttribute = processConfigAttribute;
this.requirePermission = requirePermission;
}
//~ Methods ========================================================================================================
/**
* Optionally specifies a method of the domain object that will be used to obtain a contained domain
* object. That contained domain object will be used for the ACL evaluation. This is useful if a domain object
* contains a parent that an ACL evaluation should be targeted for, instead of the child domain object (which
* perhaps is being created and as such does not yet have any ACL permissions)
*
* @return null to use the domain object, or the name of a method (that requires no arguments) that
* should be invoked to obtain an Object which will be the domain object used for ACL
* evaluation
*/
public String getInternalMethod() {
return internalMethod;
}
public String getProcessConfigAttribute() {
return processConfigAttribute;
}
public void setInternalMethod(String internalMethod) {
this.internalMethod = internalMethod;
}
public void setObjectIdentityRetrievalStrategy(ObjectIdentityRetrievalStrategy objectIdentityRetrievalStrategy) {
Assert.notNull(objectIdentityRetrievalStrategy, "ObjectIdentityRetrievalStrategy required");
this.objectIdentityRetrievalStrategy = objectIdentityRetrievalStrategy;
}
public void setSidRetrievalStrategy(SidRetrievalStrategy sidRetrievalStrategy) {
Assert.notNull(sidRetrievalStrategy, "SidRetrievalStrategy required");
this.sidRetrievalStrategy = sidRetrievalStrategy;
}
public boolean supports(ConfigAttribute attribute) {
if ((attribute.getAttribute() != null) && attribute.getAttribute().equals(getProcessConfigAttribute())) {
return true;
} else {
return false;
}
}
public int vote(Authentication authentication, Object object, ConfigAttributeDefinition config) {
Iterator iter = config.getConfigAttributes();
while (iter.hasNext()) {
ConfigAttribute attr = (ConfigAttribute) iter.next();
if (this.supports(attr)) {
// Need to make an access decision on this invocation
// Attempt to locate the domain object instance to process
Object domainObject = getDomainObjectInstance(object);
// Evaluate if we are required to use an inner domain object
if (domainObject != null && internalMethod != null && (!"".equals(internalMethod))) {
try {
Class clazz = domainObject.getClass();
Method method = clazz.getMethod(internalMethod, new Class[] {});
domainObject = method.invoke(domainObject, new Object[] {});
} catch (NoSuchMethodException nsme) {
throw new AuthorizationServiceException("Object of class '" + domainObject.getClass()
+ "' does not provide the requested internalMethod: " + internalMethod);
} catch (IllegalAccessException iae) {
if (logger.isDebugEnabled()) {
logger.debug("IllegalAccessException", iae);
if (iae.getCause() != null) {
logger.debug("Cause: " + iae.getCause().getMessage(), iae.getCause());
}
}
throw new AuthorizationServiceException("Problem invoking internalMethod: " + internalMethod
+ " for object: " + domainObject);
} catch (InvocationTargetException ite) {
if (logger.isDebugEnabled()) {
logger.debug("InvocationTargetException", ite);
if (ite.getCause() != null) {
logger.debug("Cause: " + ite.getCause().getMessage(), ite.getCause());
}
}
throw new AuthorizationServiceException("Problem invoking internalMethod: " + internalMethod
+ " for object: " + domainObject);
}
}
// If domain object is null, vote to abstain
if (domainObject == null) {
if (logger.isDebugEnabled()) {
logger.debug("Voting to abstain - domainObject is null");
}
return AccessDecisionVoter.ACCESS_ABSTAIN;
}
// Obtain the OID applicable to the domain object
ObjectIdentity objectIdentity = objectIdentityRetrievalStrategy.getObjectIdentity(domainObject);
// Obtain the SIDs applicable to the principal
Sid[] sids = sidRetrievalStrategy.getSids(authentication);
Acl acl;
try {
// Lookup only ACLs for SIDs we're interested in
acl = aclService.readAclById(objectIdentity, sids);
} catch (NotFoundException nfe) {
if (logger.isDebugEnabled()) {
logger.debug("Voting to deny access - no ACLs apply for this principal");
}
return AccessDecisionVoter.ACCESS_DENIED;
}
try {
if (acl.isGranted(requirePermission, sids, false)) {
if (logger.isDebugEnabled()) {
logger.debug("Voting to grant access");
}
return AccessDecisionVoter.ACCESS_GRANTED;
} else {
if (logger.isDebugEnabled()) {
logger.debug(
"Voting to deny access - ACLs returned, but insufficient permissions for this principal");
}
return AccessDecisionVoter.ACCESS_DENIED;
}
} catch (NotFoundException nfe) {
if (logger.isDebugEnabled()) {
logger.debug("Voting to deny access - no ACLs apply for this principal");
}
return AccessDecisionVoter.ACCESS_DENIED;
}
}
}
// No configuration attribute matched, so abstain
return AccessDecisionVoter.ACCESS_ABSTAIN;
}
}
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