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ATT reference implementation of XACML PDP engine
/*
*
* Copyright (c) 2013,2019 AT&T Knowledge Ventures
* SPDX-License-Identifier: MIT
*/
package com.att.research.xacmlatt.pdp.policy.dom;
import java.io.File;
import java.util.Iterator;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.att.research.xacml.api.Identifier;
import com.att.research.xacml.api.XACML3;
import com.att.research.xacml.std.StdStatusCode;
import com.att.research.xacml.std.dom.DOMProperties;
import com.att.research.xacml.std.dom.DOMStructureException;
import com.att.research.xacml.std.dom.DOMUtil;
import com.att.research.xacml.util.FactoryException;
import com.att.research.xacml.util.StringUtils;
import com.att.research.xacmlatt.pdp.policy.CombiningAlgorithm;
import com.att.research.xacmlatt.pdp.policy.CombiningAlgorithmFactory;
import com.att.research.xacmlatt.pdp.policy.Policy;
import com.att.research.xacmlatt.pdp.policy.PolicyDefaults;
import com.att.research.xacmlatt.pdp.policy.PolicySet;
import com.att.research.xacmlatt.pdp.policy.Rule;
/**
* DOMPolicy extends {@link com.att.research.xacmlatt.pdp.policy.Policy} with methods for creation from a
* DOM {@link org.w3c.dom.Node}.
*
* @author car
* @version $Revision: 1.4 $
*/
public class DOMPolicy {
private static final Logger logger = LoggerFactory.getLogger(DOMPolicy.class);
/**
* Creates a new DOMPolicy to be configured from a DOM Node.
*/
protected DOMPolicy() {
}
/**
* Creates a new DOMPolicy by parsing the given Node representing a XACML Policy element.
*
* @param nodePolicy the Node representing the Policy element
* @param policySetParent PolicySet parent
* @param policyDefaultsParent the PolicyDefaults of the parent element of the Policy element or null if this is the root
* @return a new DOMPolicy parsed from the given Node
* @throws DOMStructureException if there is an error parsing the Node
*/
public static Policy newInstance(Node nodePolicy, PolicySet policySetParent, PolicyDefaults policyDefaultsParent) throws DOMStructureException {
Element elementPolicy = DOMUtil.getElement(nodePolicy);
boolean bLenient = DOMProperties.isLenient();
Policy domPolicy = new Policy(policySetParent);
Identifier identifier;
Integer integer;
Iterator iterator;
try {
NodeList children = elementPolicy.getChildNodes();
int numChildren;
if (children != null && (numChildren = children.getLength()) > 0) {
/*
* Run through once, quickly, to set the PolicyDefaults for the new DOMPolicySet
*/
for (int i = 0 ; i < numChildren ; i++) {
Node child = children.item(i);
if (DOMUtil.isNamespaceElement(child, XACML3.XMLNS) && XACML3.ELEMENT_POLICYDEFAULTS.equals(child.getLocalName())) {
if (domPolicy.getPolicyDefaults() != null && !bLenient) {
throw DOMUtil.newUnexpectedElementException(child, nodePolicy);
}
domPolicy.setPolicyDefaults(DOMPolicyDefaults.newInstance(child, policyDefaultsParent));
}
}
if (domPolicy.getPolicyDefaults() == null) {
domPolicy.setPolicyDefaults(policyDefaultsParent);
}
for (int i = 0 ; i < numChildren ; i++) {
Node child = children.item(i);
if (DOMUtil.isElement(child)) {
if (DOMUtil.isInNamespace(child, XACML3.XMLNS)) {
String childName = child.getLocalName();
if (XACML3.ELEMENT_DESCRIPTION.equals(childName)) {
if (domPolicy.getDescription() != null && !bLenient) {
throw DOMUtil.newUnexpectedElementException(child, nodePolicy);
}
domPolicy.setDescription(child.getTextContent());
} else if (XACML3.ELEMENT_POLICYISSUER.equals(childName)) {
if (domPolicy.getPolicyIssuer() != null && !bLenient) {
throw DOMUtil.newUnexpectedElementException(child, nodePolicy);
}
domPolicy.setPolicyIssuer(DOMPolicyIssuer.newInstance(child));
} else if (XACML3.ELEMENT_POLICYDEFAULTS.equals(childName)) {
} else if (XACML3.ELEMENT_TARGET.equals(childName)) {
if (domPolicy.getTarget() != null && !bLenient) {
throw DOMUtil.newUnexpectedElementException(child, nodePolicy);
}
domPolicy.setTarget(DOMTarget.newInstance(child));
} else if (XACML3.ELEMENT_COMBINERPARAMETERS.equals(childName)) {
domPolicy.addCombinerParameters(DOMCombinerParameter.newList(child));
} else if (XACML3.ELEMENT_RULECOMBINERPARAMETERS.equals(childName)) {
domPolicy.addRuleCombinerParameter(DOMRuleCombinerParameters.newInstance(child));
} else if (XACML3.ELEMENT_VARIABLEDEFINITION.equals(childName)) {
domPolicy.addVariableDefinition(DOMVariableDefinition.newInstance(child, domPolicy));
} else if (XACML3.ELEMENT_RULE.equals(childName)) {
domPolicy.addRule(DOMRule.newInstance(child, domPolicy));
} else if (XACML3.ELEMENT_OBLIGATIONEXPRESSIONS.equals(childName)) {
if ((iterator = domPolicy.getObligationExpressions()) != null && iterator.hasNext() && !bLenient) {
throw DOMUtil.newUnexpectedElementException(child, nodePolicy);
}
domPolicy.setObligationExpressions(DOMObligationExpression.newList(child, domPolicy));
} else if (XACML3.ELEMENT_ADVICEEXPRESSIONS.equals(childName)) {
if ((iterator = domPolicy.getAdviceExpressions())!= null && iterator.hasNext() && !bLenient) {
throw DOMUtil.newUnexpectedElementException(child, nodePolicy);
}
domPolicy.setAdviceExpressions(DOMAdviceExpression.newList(child, domPolicy));
} else if (!bLenient) {
throw DOMUtil.newUnexpectedElementException(child, nodePolicy);
}
}
}
}
}
domPolicy.setIdentifier(DOMUtil.getIdentifierAttribute(elementPolicy, XACML3.ATTRIBUTE_POLICYID, !bLenient));
domPolicy.setVersion(DOMUtil.getVersionAttribute(elementPolicy, XACML3.ATTRIBUTE_VERSION, !bLenient));
identifier = DOMUtil.getIdentifierAttribute(elementPolicy, XACML3.ATTRIBUTE_RULECOMBININGALGID, !bLenient);
CombiningAlgorithm combiningAlgorithmRule = null;
try {
combiningAlgorithmRule = CombiningAlgorithmFactory.newInstance().getRuleCombiningAlgorithm(identifier);
} catch (FactoryException ex) {
if (!bLenient) {
throw new DOMStructureException("Failed to get CombiningAlgorithm", ex);
}
}
if (combiningAlgorithmRule == null && !bLenient) {
throw new DOMStructureException(elementPolicy, "Unknown rule combining algorithm \"" + identifier.toString() + "\" in \"" + DOMUtil.getNodeLabel(nodePolicy));
} else {
domPolicy.setRuleCombiningAlgorithm(combiningAlgorithmRule);
}
if ((integer = DOMUtil.getIntegerAttribute(elementPolicy, XACML3.ATTRIBUTE_MAXDELEGATIONDEPTH)) != null) {
domPolicy.setMaxDelegationDepth(integer);
}
} catch (DOMStructureException ex) {
domPolicy.setStatus(StdStatusCode.STATUS_CODE_SYNTAX_ERROR, ex.getMessage());
if (DOMProperties.throwsExceptions()) {
throw ex;
}
}
return domPolicy;
}
public static boolean repair(Node nodePolicy) throws DOMStructureException {
Element elementPolicy = DOMUtil.getElement(nodePolicy);
boolean result = false;
NodeList children = elementPolicy.getChildNodes();
int numChildren;
boolean sawDescription = false;
boolean sawIssuer = false;
boolean sawTarget = false;
boolean sawPolicyDefaults = false;
boolean sawObligationExprs = false;
boolean sawAdviceExprs = false;
if (children != null && (numChildren = children.getLength()) > 0) {
for (int i = 0 ; i < numChildren ; i++) {
Node child = children.item(i);
if (DOMUtil.isElement(child)) {
if (DOMUtil.isInNamespace(child, XACML3.XMLNS)) {
String childName = child.getLocalName();
if (XACML3.ELEMENT_DESCRIPTION.equals(childName)) {
if (sawDescription) {
logger.warn("Unexpected element {}", child.getNodeName());
elementPolicy.removeChild(child);
result = true;
} else {
sawDescription = true;
}
} else if (XACML3.ELEMENT_POLICYISSUER.equals(childName)) {
if (sawIssuer) {
logger.warn("Unexpected element {}", child.getNodeName());
elementPolicy.removeChild(child);
result = true;
} else {
sawDescription = true;
result = DOMPolicyIssuer.repair(child) || result;
}
} else if (XACML3.ELEMENT_POLICYDEFAULTS.equals(childName)) {
if (sawPolicyDefaults) {
logger.warn("Unexpected element {}", child.getNodeName());
elementPolicy.removeChild(child);
result = true;
} else {
sawPolicyDefaults = true;
result = DOMPolicyDefaults.repair(child) || result;
}
} else if (XACML3.ELEMENT_TARGET.equals(childName)) {
if (sawTarget) {
logger.warn("Unexpected element {}", child.getNodeName());
elementPolicy.removeChild(child);
result = true;
} else {
sawTarget = true;
result = DOMTarget.repair(child) || result;
}
} else if (XACML3.ELEMENT_COMBINERPARAMETERS.equals(childName)) {
result = DOMCombinerParameter.repair(child) || result;
} else if (XACML3.ELEMENT_RULECOMBINERPARAMETERS.equals(childName)) {
result = DOMRuleCombinerParameters.repair(child) || result;
} else if (XACML3.ELEMENT_VARIABLEDEFINITION.equals(childName)) {
result = DOMVariableDefinition.repair(child) || result;
} else if (XACML3.ELEMENT_RULE.equals(childName)) {
result = DOMRule.repair(child) || result;
} else if (XACML3.ELEMENT_OBLIGATIONEXPRESSIONS.equals(childName)) {
if (sawObligationExprs) {
logger.warn("Unexpected element {}", child.getNodeName());
elementPolicy.removeChild(child);
result = true;
} else {
sawObligationExprs = true;
result = DOMObligationExpression.repairList(child) || result;
}
} else if (XACML3.ELEMENT_ADVICEEXPRESSIONS.equals(childName)) {
if (sawAdviceExprs) {
logger.warn("Unexpected element {}", child.getNodeName());
elementPolicy.removeChild(child);
result = true;
} else {
sawAdviceExprs = true;
result = DOMAdviceExpression.repairList(child) || result;
}
} else {
logger.warn("Unexpected element {}", child.getNodeName());
elementPolicy.removeChild(child);
result = true;
}
}
}
}
}
result = DOMUtil.repairIdentifierAttribute(elementPolicy, XACML3.ATTRIBUTE_POLICYID, logger) || result;
result = DOMUtil.repairVersionAttribute(elementPolicy, XACML3.ATTRIBUTE_VERSION, logger) || result;
result = DOMUtil.repairIdentifierAttribute(elementPolicy, XACML3.ATTRIBUTE_RULECOMBININGALGID, XACML3.ID_RULE_DENY_OVERRIDES, logger) || result;
Identifier identifier = DOMUtil.getIdentifierAttribute(elementPolicy, XACML3.ATTRIBUTE_RULECOMBININGALGID);
CombiningAlgorithm combiningAlgorithmRule = null;
try {
combiningAlgorithmRule = CombiningAlgorithmFactory.newInstance().getRuleCombiningAlgorithm(identifier);
} catch (FactoryException ex) {
combiningAlgorithmRule = null;
}
if(combiningAlgorithmRule == null) {
logger.warn("Setting invalid {} attribute {} to {}", XACML3.ATTRIBUTE_RULECOMBININGALGID, identifier.stringValue(), XACML3.ID_RULE_DENY_OVERRIDES.stringValue());
elementPolicy.setAttribute(XACML3.ATTRIBUTE_RULECOMBININGALGID, XACML3.ID_RULE_DENY_OVERRIDES.stringValue());
result = true;
}
return result;
}
public static void main(String args[]) {
try {
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setNamespaceAware(true);
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
for (String fileName: args) {
File filePolicy = new File(fileName);
if (filePolicy.exists() && filePolicy.canRead()) {
try {
Document documentPolicy = documentBuilder.parse(filePolicy);
if (documentPolicy.getFirstChild() == null) {
System.err.println(fileName + ": Error: No Policy found");
} else if (!XACML3.ELEMENT_POLICY.equals(documentPolicy.getFirstChild().getLocalName())) {
System.err.println(fileName + ": Error: Not a Policy documnt");
} else {
Policy policy = DOMPolicy.newInstance(documentPolicy.getFirstChild(), null, null);
System.out.println(fileName + ": validate()=" + policy.validate());
System.out.println(StringUtils.prettyPrint(policy.toString()));
}
} catch (Exception ex) {
System.err.println("Exception processing policy file \"" + fileName + "\"");
ex.printStackTrace(System.err);
}
} else {
System.err.println("Cannot read policy file \"" + fileName + "\"");
}
}
} catch (Exception ex) {
ex.printStackTrace(System.err);
System.exit(1);
}
System.exit(0);
}
}