| /* |
| * 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.geode.cache.query.security; |
| |
| import java.lang.reflect.Method; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Objects; |
| import java.util.Properties; |
| import java.util.Set; |
| import java.util.regex.Pattern; |
| |
| import org.apache.geode.cache.Cache; |
| import org.apache.geode.cache.Declarable; |
| import org.apache.geode.cache.Region; |
| |
| /** |
| * An immutable and thread-safe {@link MethodInvocationAuthorizer} that only allows the execution of |
| * those methods matching the configured regular expression. |
| * <p/> |
| * |
| * Some known dangerous methods, like {@link Object#getClass()}, are also rejected by this |
| * authorizer implementation, no matter whether the method matches the configured regular |
| * expressions |
| * or not (see {@link RestrictedMethodAuthorizer#isPermanentlyForbiddenMethod(Method, Object)}). |
| * <p/> |
| * |
| * When correctly configured, this authorizer implementation addresses the four known security |
| * risks: {@code Java Reflection}, {@code Cache Modification}, {@code Region Modification} and |
| * {@code Region Entry Modification}. |
| * <p/> |
| * |
| * For the above statement to remain true, however, the regular expressions used must be |
| * exhaustively studied and configured so no mutator methods match. If the regular expressions are |
| * not restrictive enough, the {@code Region Entry Modification} security risk still exists: users |
| * with the {@code DATA:READ:RegionName} privileges will be able to execute methods (even those |
| * modifying the entry) on the objects stored within the region and on instances used as bind |
| * parameters of the query, so this authorizer must be used with extreme care. |
| * <p/> |
| * |
| * Usage of this authorizer implementation is only recommended for scenarios on which the user or |
| * operator knows exactly what code is deployed to the cluster, how and when; allowing a correct |
| * configuration of the regular expressions. It might also be used on clusters on which the entries |
| * stored are immutable. |
| * <p/> |
| * |
| * @see org.apache.geode.cache.Cache |
| * @see org.apache.geode.cache.query.security.MethodInvocationAuthorizer |
| * @see org.apache.geode.cache.query.security.RestrictedMethodAuthorizer |
| */ |
| public final class RegExMethodAuthorizer implements MethodInvocationAuthorizer { |
| private static final String GEODE_BASE_PACKAGE = "org.apache.geode"; |
| static final String NULL_CACHE_MESSAGE = "Cache should be provided to configure this authorizer."; |
| static final String NULL_AUTHORIZER_MESSAGE = |
| "RestrictedMethodAuthorizer should be provided to create this authorizer."; |
| static final String NULL_REGULAR_EXPRESSIONS_MESSAGE = |
| "A set of regular expression should be provided to configure this authorizer."; |
| private final Set<String> allowedPatterns; |
| private final Set<Pattern> compiledPatterns; |
| private final RestrictedMethodAuthorizer restrictedMethodAuthorizer; |
| |
| private Set<Pattern> compilePatterns() { |
| Set<Pattern> patterns = new HashSet<>(); |
| allowedPatterns.forEach(regEx -> patterns.add(Pattern.compile(regEx))); |
| |
| return patterns; |
| } |
| |
| /** |
| * Returns an unmodifiable view of the regular expressions used to configure this authorizer. |
| * This method can be used to get "read-only" access to the set containing the regular expressions |
| * that will be used to determine whether a method is allowed or not. |
| * |
| * @return an unmodifiable view of the regular expressions used to configure this authorizer. |
| */ |
| public Set<String> getAllowedPatterns() { |
| return allowedPatterns; |
| } |
| |
| /** |
| * Creates a {@code RegExMethodAuthorizer} object and initializes it so it can be safely used |
| * in a multi-threaded environment. |
| * <p/> |
| * |
| * Applications can use this constructor as part of the initialization for custom authorizers |
| * (see {@link Declarable#initialize(Cache, Properties)}, when using a declarative approach. |
| * |
| * @param cache the {@code Cache} instance that owns this authorizer, required in order to |
| * configure the default {@link RestrictedMethodAuthorizer}. |
| * @param allowedPatterns the regular expressions that will be used to determine whether a method |
| * is authorized or not. |
| */ |
| public RegExMethodAuthorizer(Cache cache, Set<String> allowedPatterns) { |
| Objects.requireNonNull(cache, NULL_CACHE_MESSAGE); |
| Objects.requireNonNull(allowedPatterns, NULL_REGULAR_EXPRESSIONS_MESSAGE); |
| |
| this.allowedPatterns = Collections.unmodifiableSet(allowedPatterns); |
| this.compiledPatterns = Collections.unmodifiableSet(compilePatterns()); |
| this.restrictedMethodAuthorizer = new RestrictedMethodAuthorizer(cache); |
| } |
| |
| /** |
| * Creates a {@code RegExMethodAuthorizer} object and initializes it so it can be safely used |
| * in a multi-threaded environment. |
| * <p/> |
| * |
| * @param restrictedMethodAuthorizer the default {@code RestrictedMethodAuthorizer} to use. |
| * @param allowedPatterns the regular expressions that will be used to determine whether a method |
| * is authorized or not. |
| */ |
| public RegExMethodAuthorizer(RestrictedMethodAuthorizer restrictedMethodAuthorizer, |
| Set<String> allowedPatterns) { |
| Objects.requireNonNull(allowedPatterns, NULL_REGULAR_EXPRESSIONS_MESSAGE); |
| Objects.requireNonNull(restrictedMethodAuthorizer, NULL_AUTHORIZER_MESSAGE); |
| |
| this.allowedPatterns = Collections.unmodifiableSet(allowedPatterns); |
| this.compiledPatterns = Collections.unmodifiableSet(compilePatterns()); |
| this.restrictedMethodAuthorizer = restrictedMethodAuthorizer; |
| } |
| |
| /** |
| * Executes the authorization logic to determine whether the {@code method} is allowed to be |
| * executed on the {@code target} object instance. |
| * If the {@code target} object is an instance of {@link Region}, this methods also ensures that |
| * the user has the {@code DATA:READ} permission granted for the target {@link Region}. |
| * <p/> |
| * |
| * @param method the {@link Method} that should be authorized. |
| * @param target the {@link Object} on which the {@link Method} will be executed. |
| * @return {@code true} if the {@code method} can be executed on on the {@code target} instance, |
| * {@code false} otherwise. |
| * |
| * @see org.apache.geode.cache.query.security.MethodInvocationAuthorizer |
| */ |
| @Override |
| public boolean authorize(Method method, Object target) { |
| // Return false for known dangerous methods. |
| if (restrictedMethodAuthorizer.isPermanentlyForbiddenMethod(method, target)) { |
| return false; |
| } |
| |
| // If the target object belongs to Geode, make sure the method is considered safe. |
| if (target.getClass().getPackage().getName().startsWith(GEODE_BASE_PACKAGE)) { |
| return restrictedMethodAuthorizer.isAllowedGeodeMethod(method, target); |
| } |
| |
| // Compare fully qualified method name against compiled expressions. |
| String fullyQualifiedMethodName = target.getClass().getName() + "." + method.getName(); |
| if (compiledPatterns.stream() |
| .anyMatch(pattern -> pattern.matcher(fullyQualifiedMethodName).matches())) { |
| return true; |
| } |
| |
| // Delegate to the default authorizer. |
| return restrictedMethodAuthorizer.authorize(method, target); |
| } |
| } |