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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.catalina.security;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.Principal;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.security.auth.Subject;
import javax.servlet.Filter;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.catalina.Globals;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.res.StringManager;
/**
* This utility class associates a Subject to the current
* AccessControlContext. When a SecurityManager is
* used, the container will always associate the called thread with an
* AccessControlContext containing only the principal of the requested
* Servlet/Filter.
*
* This class uses reflection to invoke the methods.
*/
public final class SecurityUtil{
// Note that indexes overlap.
// A Servlet uses "init", "service", "event", "destroy".
// A Filter uses "doFilter", "doFilterEvent", "destroy".
private static final int INIT= 0;
private static final int SERVICE = 1;
private static final int DOFILTER = 1;
private static final int EVENT = 2;
private static final int DOFILTEREVENT = 2;
private static final int DESTROY = 3;
private static final String INIT_METHOD = "init";
private static final String DOFILTER_METHOD = "doFilter";
private static final String SERVICE_METHOD = "service";
private static final String EVENT_METHOD = "event";
private static final String DOFILTEREVENT_METHOD = "doFilterEvent";
private static final String DESTROY_METHOD = "destroy";
/**
* Cache every class for which we are creating methods.
*/
private static final Map,Method[]> classCache = new ConcurrentHashMap<>();
private static final Log log = LogFactory.getLog(SecurityUtil.class);
private static final boolean packageDefinitionEnabled =
(System.getProperty("package.definition") == null &&
System.getProperty("package.access") == null) ? false : true;
/**
* The string resources for this package.
*/
private static final StringManager sm =
StringManager.getManager(Constants.PACKAGE);
/**
* Perform work as a particular Subject. Here the work
* will be granted to a null subject.
*
* @param methodName the method to apply the security restriction
* @param targetObject the Servlet on which the method will
* be called.
* @throws Exception an execution error occurred
*/
public static void doAsPrivilege(final String methodName,
final Servlet targetObject) throws Exception {
doAsPrivilege(methodName, targetObject, null, null, null);
}
/**
* Perform work as a particular Subject. Here the work
* will be granted to a null subject.
*
* @param methodName the method to apply the security restriction
* @param targetObject the Servlet on which the method will
* be called.
* @param targetType Class array used to instantiate a
* Method object.
* @param targetArguments Object array contains the runtime
* parameters instance.
* @throws Exception an execution error occurred
*/
public static void doAsPrivilege(final String methodName,
final Servlet targetObject,
final Class[] targetType,
final Object[] targetArguments)
throws Exception {
doAsPrivilege(methodName,
targetObject,
targetType,
targetArguments,
null);
}
/**
* Perform work as a particular Subject. Here the work
* will be granted to a null subject.
*
* @param methodName the method to apply the security restriction
* @param targetObject the Servlet on which the method will
* be called.
* @param targetParameterTypes Class array used to instantiate a
* Method object.
* @param targetArguments Object array contains the
* runtime parameters instance.
* @param principal the Principal to which the security
* privilege applies
* @throws Exception an execution error occurred
*/
public static void doAsPrivilege(final String methodName,
final Servlet targetObject,
final Class[] targetParameterTypes,
final Object[] targetArguments,
Principal principal)
throws Exception {
Method method = null;
Method[] methodsCache = classCache.get(Servlet.class);
if(methodsCache == null) {
method = createMethodAndCacheIt(null,
Servlet.class,
methodName,
targetParameterTypes);
} else {
method = findMethod(methodsCache, methodName);
if (method == null) {
method = createMethodAndCacheIt(methodsCache,
Servlet.class,
methodName,
targetParameterTypes);
}
}
execute(method, targetObject, targetArguments, principal);
}
/**
* Perform work as a particular Subject. Here the work
* will be granted to a null subject.
*
* @param methodName the method to apply the security restriction
* @param targetObject the Filter on which the method will
* be called.
* @throws Exception an execution error occurred
*/
public static void doAsPrivilege(final String methodName,
final Filter targetObject)
throws Exception {
doAsPrivilege(methodName, targetObject, null, null);
}
/**
* Perform work as a particular Subject. Here the work
* will be granted to a null subject.
*
* @param methodName the method to apply the security restriction
* @param targetObject the Filter on which the method will
* be called.
* @param targetType Class array used to instantiate a
* Method object.
* @param targetArguments Object array contains the
* runtime parameters instance.
* @throws Exception an execution error occurred
*/
public static void doAsPrivilege(final String methodName,
final Filter targetObject,
final Class[] targetType,
final Object[] targetArguments)
throws Exception {
doAsPrivilege(
methodName, targetObject, targetType, targetArguments, null);
}
/**
* Perform work as a particular Subject. Here the work
* will be granted to a null subject.
*
* @param methodName the method to apply the security restriction
* @param targetObject the Filter on which the method will
* be called.
* @param targetParameterTypes Class array used to instantiate a
* Method object.
* @param targetParameterValues Object array contains the
* runtime parameters instance.
* @param principal the Principal to which the security
* privilege applies
* @throws Exception an execution error occurred
*/
public static void doAsPrivilege(final String methodName,
final Filter targetObject,
final Class[] targetParameterTypes,
final Object[] targetParameterValues,
Principal principal)
throws Exception {
Method method = null;
Method[] methodsCache = classCache.get(Filter.class);
if(methodsCache == null) {
method = createMethodAndCacheIt(null,
Filter.class,
methodName,
targetParameterTypes);
} else {
method = findMethod(methodsCache, methodName);
if (method == null) {
method = createMethodAndCacheIt(methodsCache,
Filter.class,
methodName,
targetParameterTypes);
}
}
execute(method, targetObject, targetParameterValues, principal);
}
/**
* Perform work as a particular Subject. Here the work
* will be granted to a null subject.
*
* @param method the method to apply the security restriction
* @param targetObject the Servlet on which the method will
* be called.
* @param targetArguments Object array contains the
* runtime parameters instance.
* @param principal the Principal to which the security
* privilege applies
* @throws Exception an execution error occurred
*/
private static void execute(final Method method,
final Object targetObject,
final Object[] targetArguments,
Principal principal)
throws Exception {
try{
Subject subject = null;
PrivilegedExceptionAction pea =
new PrivilegedExceptionAction(){
@Override
public Void run() throws Exception{
method.invoke(targetObject, targetArguments);
return null;
}
};
// The first argument is always the request object
if (targetArguments != null
&& targetArguments[0] instanceof HttpServletRequest){
HttpServletRequest request =
(HttpServletRequest)targetArguments[0];
boolean hasSubject = false;
HttpSession session = request.getSession(false);
if (session != null){
subject =
(Subject)session.getAttribute(Globals.SUBJECT_ATTR);
hasSubject = (subject != null);
}
if (subject == null){
subject = new Subject();
if (principal != null){
subject.getPrincipals().add(principal);
}
}
if (session != null && !hasSubject) {
session.setAttribute(Globals.SUBJECT_ATTR, subject);
}
}
Subject.doAsPrivileged(subject, pea, null);
} catch( PrivilegedActionException pe) {
Throwable e;
if (pe.getException() instanceof InvocationTargetException) {
e = pe.getException().getCause();
ExceptionUtils.handleThrowable(e);
} else {
e = pe;
}
if (log.isDebugEnabled()){
log.debug(sm.getString("SecurityUtil.doAsPrivilege"), e);
}
if (e instanceof UnavailableException)
throw (UnavailableException) e;
else if (e instanceof ServletException)
throw (ServletException) e;
else if (e instanceof IOException)
throw (IOException) e;
else if (e instanceof RuntimeException)
throw (RuntimeException) e;
else
throw new ServletException(e.getMessage(), e);
}
}
/**
* Find a method stored within the cache.
* @param methodsCache the cache used to store method instance
* @param methodName the method to apply the security restriction
* @return the method instance, null if not yet created.
*/
private static Method findMethod(Method[] methodsCache,
String methodName){
if (methodName.equals(INIT_METHOD)){
return methodsCache[INIT];
} else if (methodName.equals(DESTROY_METHOD)){
return methodsCache[DESTROY];
} else if (methodName.equals(SERVICE_METHOD)){
return methodsCache[SERVICE];
} else if (methodName.equals(DOFILTER_METHOD)){
return methodsCache[DOFILTER];
} else if (methodName.equals(EVENT_METHOD)){
return methodsCache[EVENT];
} else if (methodName.equals(DOFILTEREVENT_METHOD)){
return methodsCache[DOFILTEREVENT];
}
return null;
}
/**
* Create the method and cache it for further re-use.
* @param methodsCache the cache used to store method instance
* @param targetType the class on which the method will be called.
* @param methodName the method to apply the security restriction
* @param parameterTypes Class array used to instantiate a
* Method object.
* @return the method instance.
* @throws Exception an execution error occurred
*/
private static Method createMethodAndCacheIt(Method[] methodsCache,
Class targetType,
String methodName,
Class[] parameterTypes)
throws Exception {
if (methodsCache == null) {
methodsCache = new Method[4];
}
Method method = targetType.getMethod(methodName, parameterTypes);
if (methodName.equals(INIT_METHOD)){
methodsCache[INIT] = method;
} else if (methodName.equals(DESTROY_METHOD)){
methodsCache[DESTROY] = method;
} else if (methodName.equals(SERVICE_METHOD)){
methodsCache[SERVICE] = method;
} else if (methodName.equals(DOFILTER_METHOD)){
methodsCache[DOFILTER] = method;
} else if (methodName.equals(EVENT_METHOD)){
methodsCache[EVENT] = method;
} else if (methodName.equals(DOFILTEREVENT_METHOD)){
methodsCache[DOFILTEREVENT] = method;
}
classCache.put(targetType, methodsCache);
return method;
}
/**
* Remove the object from the cache.
*
* @param cachedObject The object to remove
*/
public static void remove(Object cachedObject){
classCache.remove(cachedObject);
}
/**
* Return the SecurityManager only if Security is enabled AND
* package protection mechanism is enabled.
* @return true if package level protection is enabled
*/
public static boolean isPackageProtectionEnabled(){
if (packageDefinitionEnabled && Globals.IS_SECURITY_ENABLED){
return true;
}
return false;
}
}
