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//$Id: JACCPermissions.java 8661 2005-11-25 12:00:22Z epbernard $
package org.hibernate.secure;

import java.lang.reflect.UndeclaredThrowableException;
import java.security.AccessController;
import java.security.CodeSource;
import java.security.Policy;
import java.security.Principal;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.security.ProtectionDomain;
import java.util.Set;
import javax.security.auth.Subject;
import javax.security.jacc.EJBMethodPermission;
import javax.security.jacc.PolicyContext;
import javax.security.jacc.PolicyContextException;


/**
 * Copied from JBoss org.jboss.ejb3.security.JaccHelper and org.jboss.ejb3.security.SecurityActions
 *
 * @author Kabir Khan
 */
public class JACCPermissions {

	public static void checkPermission(Class clazz, String contextID, EJBMethodPermission methodPerm)
			throws SecurityException {
		CodeSource ejbCS = clazz.getProtectionDomain().getCodeSource();

		try {
			setContextID( contextID );

			Policy policy = Policy.getPolicy();
			// Get the caller
			Subject caller = getContextSubject();

			Principal[] principals = null;
			if ( caller != null ) {
				// Get the caller principals
				Set principalsSet = caller.getPrincipals();
				principals = new Principal[ principalsSet.size() ];
				principalsSet.toArray( principals );
			}

			ProtectionDomain pd = new ProtectionDomain( ejbCS, null, null, principals );
			if ( policy.implies( pd, methodPerm ) == false ) {
				String msg = "Denied: " + methodPerm + ", caller=" + caller;
				SecurityException e = new SecurityException( msg );
				throw e;
			}
		}
		catch (PolicyContextException e) {
			throw new RuntimeException( e );
		}
	}

	interface PolicyContextActions {
		/**
		 * The JACC PolicyContext key for the current Subject
		 */
		static final String SUBJECT_CONTEXT_KEY = "javax.security.auth.Subject.container";
		PolicyContextActions PRIVILEGED = new PolicyContextActions() {
			private final PrivilegedExceptionAction exAction = new PrivilegedExceptionAction() {
				public Object run() throws Exception {
					return (Subject) PolicyContext.getContext( SUBJECT_CONTEXT_KEY );
				}
			};

			public Subject getContextSubject() throws PolicyContextException {
				try {
					return (Subject) AccessController.doPrivileged( exAction );
				}
				catch (PrivilegedActionException e) {
					Exception ex = e.getException();
					if ( ex instanceof PolicyContextException ) {
						throw (PolicyContextException) ex;
					}
					else {
						throw new UndeclaredThrowableException( ex );
					}
				}
			}
		};

		PolicyContextActions NON_PRIVILEGED = new PolicyContextActions() {
			public Subject getContextSubject() throws PolicyContextException {
				return (Subject) PolicyContext.getContext( SUBJECT_CONTEXT_KEY );
			}
		};

		Subject getContextSubject() throws PolicyContextException;
	}

	static Subject getContextSubject() throws PolicyContextException {
		if ( System.getSecurityManager() == null ) {
			return PolicyContextActions.NON_PRIVILEGED.getContextSubject();
		}
		else {
			return PolicyContextActions.PRIVILEGED.getContextSubject();
		}
	}

	private static class SetContextID implements PrivilegedAction {
		String contextID;

		SetContextID(String contextID) {
			this.contextID = contextID;
		}

		public Object run() {
			String previousID = PolicyContext.getContextID();
			PolicyContext.setContextID( contextID );
			return previousID;
		}
	}

	static String setContextID(String contextID) {
		PrivilegedAction action = new SetContextID( contextID );
		String previousID = (String) AccessController.doPrivileged( action );
		return previousID;
	}
}