| /* |
| * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.jca; |
| |
| import java.util.*; |
| |
| import java.security.Provider; |
| import java.security.Security; |
| |
| /** |
| * Collection of methods to get and set provider list. Also includes |
| * special code for the provider list during JAR verification. |
| * |
| * @author Andreas Sterbenz |
| * @since 1.5 |
| */ |
| public class Providers { |
| |
| private static final ThreadLocal<ProviderList> threadLists = |
| new InheritableThreadLocal<>(); |
| |
| // number of threads currently using thread-local provider lists |
| // tracked to allow an optimization if == 0 |
| private static volatile int threadListsUsed; |
| |
| // current system-wide provider list |
| // Note volatile immutable object, so no synchronization needed. |
| private static volatile ProviderList providerList; |
| |
| static { |
| // set providerList to empty list first in case initialization somehow |
| // triggers a getInstance() call (although that should not happen) |
| providerList = ProviderList.EMPTY; |
| providerList = ProviderList.fromSecurityProperties(); |
| } |
| |
| private Providers() { |
| // empty |
| } |
| |
| // we need special handling to resolve circularities when loading |
| // signed JAR files during startup. The code below is part of that. |
| |
| // Basically, before we load data from a signed JAR file, we parse |
| // the PKCS#7 file and verify the signature. We need a |
| // CertificateFactory, Signatures, etc. to do that. We have to make |
| // sure that we do not try to load the implementation from the JAR |
| // file we are just verifying. |
| // |
| // To avoid that, we use different provider settings during JAR |
| // verification. However, we do not want those provider settings to |
| // interfere with other parts of the system. Therefore, we make them local |
| // to the Thread executing the JAR verification code. |
| // |
| // The code here is used by sun.security.util.SignatureFileVerifier. |
| // See there for details. |
| |
| private static final String BACKUP_PROVIDER_CLASSNAME = |
| "sun.security.provider.VerificationProvider"; |
| |
| // Hardcoded classnames of providers to use for JAR verification. |
| // MUST NOT be on the bootclasspath and not in signed JAR files. |
| private static final String[] jarVerificationProviders = { |
| "sun.security.provider.Sun", |
| "sun.security.rsa.SunRsaSign", |
| // Note: SunEC *is* in a signed JAR file, but it's not signed |
| // by EC itself. So it's still safe to be listed here. |
| "sun.security.ec.SunEC", |
| BACKUP_PROVIDER_CLASSNAME, |
| }; |
| |
| // Return to Sun provider or its backup. |
| // This method should only be called by |
| // sun.security.util.ManifestEntryVerifier and java.security.SecureRandom. |
| public static Provider getSunProvider() { |
| try { |
| Class clazz = Class.forName(jarVerificationProviders[0]); |
| return (Provider)clazz.newInstance(); |
| } catch (Exception e) { |
| try { |
| Class clazz = Class.forName(BACKUP_PROVIDER_CLASSNAME); |
| return (Provider)clazz.newInstance(); |
| } catch (Exception ee) { |
| throw new RuntimeException("Sun provider not found", e); |
| } |
| } |
| } |
| |
| /** |
| * Start JAR verification. This sets a special provider list for |
| * the current thread. You MUST save the return value from this |
| * method and you MUST call stopJarVerification() with that object |
| * once you are done. |
| */ |
| public static Object startJarVerification() { |
| ProviderList currentList = getProviderList(); |
| ProviderList jarList = currentList.getJarList(jarVerificationProviders); |
| // return the old thread-local provider list, usually null |
| return beginThreadProviderList(jarList); |
| } |
| |
| /** |
| * Stop JAR verification. Call once you have completed JAR verification. |
| */ |
| public static void stopJarVerification(Object obj) { |
| // restore old thread-local provider list |
| endThreadProviderList((ProviderList)obj); |
| } |
| |
| /** |
| * Return the current ProviderList. If the thread-local list is set, |
| * it is returned. Otherwise, the system wide list is returned. |
| */ |
| public static ProviderList getProviderList() { |
| ProviderList list = getThreadProviderList(); |
| if (list == null) { |
| list = getSystemProviderList(); |
| } |
| return list; |
| } |
| |
| /** |
| * Set the current ProviderList. Affects the thread-local list if set, |
| * otherwise the system wide list. |
| */ |
| public static void setProviderList(ProviderList newList) { |
| if (getThreadProviderList() == null) { |
| setSystemProviderList(newList); |
| } else { |
| changeThreadProviderList(newList); |
| } |
| } |
| |
| /** |
| * Get the full provider list with invalid providers (those that |
| * could not be loaded) removed. This is the list we need to |
| * present to applications. |
| */ |
| public static ProviderList getFullProviderList() { |
| ProviderList list; |
| synchronized (Providers.class) { |
| list = getThreadProviderList(); |
| if (list != null) { |
| ProviderList newList = list.removeInvalid(); |
| if (newList != list) { |
| changeThreadProviderList(newList); |
| list = newList; |
| } |
| return list; |
| } |
| } |
| list = getSystemProviderList(); |
| ProviderList newList = list.removeInvalid(); |
| if (newList != list) { |
| setSystemProviderList(newList); |
| list = newList; |
| } |
| return list; |
| } |
| |
| private static ProviderList getSystemProviderList() { |
| return providerList; |
| } |
| |
| private static void setSystemProviderList(ProviderList list) { |
| providerList = list; |
| } |
| |
| public static ProviderList getThreadProviderList() { |
| // avoid accessing the threadlocal if none are currently in use |
| // (first use of ThreadLocal.get() for a Thread allocates a Map) |
| if (threadListsUsed == 0) { |
| return null; |
| } |
| return threadLists.get(); |
| } |
| |
| // Change the thread local provider list. Use only if the current thread |
| // is already using a thread local list and you want to change it in place. |
| // In other cases, use the begin/endThreadProviderList() methods. |
| private static void changeThreadProviderList(ProviderList list) { |
| threadLists.set(list); |
| } |
| |
| /** |
| * Methods to manipulate the thread local provider list. It is for use by |
| * JAR verification (see above) and the SunJSSE FIPS mode only. |
| * |
| * It should be used as follows: |
| * |
| * ProviderList list = ...; |
| * ProviderList oldList = Providers.beginThreadProviderList(list); |
| * try { |
| * // code that needs thread local provider list |
| * } finally { |
| * Providers.endThreadProviderList(oldList); |
| * } |
| * |
| */ |
| |
| public static synchronized ProviderList beginThreadProviderList(ProviderList list) { |
| if (ProviderList.debug != null) { |
| ProviderList.debug.println("ThreadLocal providers: " + list); |
| } |
| ProviderList oldList = threadLists.get(); |
| threadListsUsed++; |
| threadLists.set(list); |
| return oldList; |
| } |
| |
| public static synchronized void endThreadProviderList(ProviderList list) { |
| if (list == null) { |
| if (ProviderList.debug != null) { |
| ProviderList.debug.println("Disabling ThreadLocal providers"); |
| } |
| threadLists.remove(); |
| } else { |
| if (ProviderList.debug != null) { |
| ProviderList.debug.println |
| ("Restoring previous ThreadLocal providers: " + list); |
| } |
| threadLists.set(list); |
| } |
| threadListsUsed--; |
| } |
| |
| } |