|
/*
|
|
* This program is a part of the IoTa Project.
|
|
*
|
|
* Copyright © 2011-2012 Université de Caen Basse-Normandie, GREYC
|
|
* Copyright © 2011 Orange Labs
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
* <http://www.gnu.org/licenses/>
|
|
*
|
|
* See AUTHORS for a list of contributors.
|
|
*/
|
|
package fr.unicaen.iota.xacml.combine;
|
|
|
|
import com.sun.xacml.EvaluationCtx;
|
|
import com.sun.xacml.Rule;
|
|
import com.sun.xacml.combine.RuleCombinerElement;
|
|
import com.sun.xacml.combine.RuleCombiningAlgorithm;
|
|
import com.sun.xacml.ctx.Result;
|
|
import java.net.URI;
|
|
import java.net.URISyntaxException;
|
|
import java.util.Iterator;
|
|
import java.util.List;
|
|
|
|
/**
|
|
* This is the standard SC Group rule combining algorithm. It allows a single
|
|
* evaluation of not applicable or indeterminate results to take precedence over
|
|
* any number of permit, deny. The result will be Deny.
|
|
*/
|
|
public class SCGroupRuleAlg extends RuleCombiningAlgorithm {
|
|
|
|
/**
|
|
* The standard URN used to identify this algorithm
|
|
*/
|
|
public static final String algId =
|
|
"urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:"
|
|
+ "sc-rule-group";
|
|
// a URI form of the identifier
|
|
private static URI identifierURI;
|
|
// exception if the URI was invalid, which should never be a problem
|
|
private static RuntimeException earlyException;
|
|
|
|
static {
|
|
try {
|
|
identifierURI = new URI(algId);
|
|
} catch (URISyntaxException se) {
|
|
earlyException = new IllegalArgumentException();
|
|
earlyException.initCause(se);
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public URI getIdentifier() {
|
|
return identifierURI;
|
|
}
|
|
|
|
/**
|
|
* Standard constructor.
|
|
*/
|
|
public SCGroupRuleAlg() {
|
|
super(identifierURI);
|
|
if (earlyException != null) {
|
|
throw earlyException;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Protected constructor used by the ordered version of this algorithm.
|
|
*
|
|
* @param identifier the algorithm's identifier
|
|
*/
|
|
public SCGroupRuleAlg(URI identifier) {
|
|
super(identifier);
|
|
}
|
|
|
|
/**
|
|
* Applies the combining rule to the set of rules based on the evaluation
|
|
* context.
|
|
*
|
|
* @param context the context from the request
|
|
* @param parameters a (possibly empty) non-null
|
|
* <code>List</code> of
|
|
* <code>CombinerParameter<code>s
|
|
* @param ruleElements the rules to combine
|
|
*
|
|
* @return the result of running the combining algorithm
|
|
*/
|
|
@Override
|
|
public Result combine(EvaluationCtx context, List parameters, List ruleElements) {
|
|
Iterator it = ruleElements.iterator();
|
|
while (it.hasNext()) {
|
|
Rule rule = ((RuleCombinerElement) (it.next())).getRule();
|
|
Result result = rule.evaluate(context);
|
|
int value = result.getDecision();
|
|
// if there was a value of DENY, INDETERMINATE or NOT_APPLICABLE, then regardless of what else
|
|
// we've seen, we always return DENY
|
|
if (value == Result.DECISION_DENY || value == Result.DECISION_INDETERMINATE || value == Result.DECISION_NOT_APPLICABLE) {
|
|
return new Result(Result.DECISION_DENY);
|
|
}
|
|
}
|
|
return new Result(Result.DECISION_PERMIT);
|
|
}
|
|
}
|