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261 lines
9.2 KiB
Java
261 lines
9.2 KiB
Java
/*
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* Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.jca;
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import java.security.Provider;
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import sun.security.x509.AlgorithmId;
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/**
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* Collection of methods to get and set provider list. Also includes
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* special code for the provider list during JAR verification.
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*
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* @author Andreas Sterbenz
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* @since 1.5
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*/
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public class Providers {
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private static final ThreadLocal<ProviderList> threadLists =
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new ThreadLocal<>();
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// number of threads currently using thread-local provider lists
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// tracked to allow an optimization if == 0
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private static volatile int threadListsUsed;
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// current system-wide provider list
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// Note volatile immutable object, so no synchronization needed.
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private static volatile ProviderList providerList;
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static {
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// set providerList to empty list first in case initialization somehow
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// triggers a getInstance() call (although that should not happen)
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providerList = ProviderList.EMPTY;
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providerList = ProviderList.fromSecurityProperties();
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}
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private Providers() {
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// empty
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}
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// After the switch to modules, JDK providers are all in modules and JDK
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// no longer needs to load signed jars during start up.
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//
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// However, for earlier releases, it needs special handling to resolve
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// circularities when loading signed JAR files during startup. The code
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// below is part of that.
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//
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// Basically, before we load data from a signed JAR file, we parse
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// the PKCS#7 file and verify the signature. We need a
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// CertificateFactory, Signatures, etc. to do that. We have to make
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// sure that we do not try to load the implementation from the JAR
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// file we are just verifying.
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//
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// To avoid that, we use different provider settings during JAR
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// verification. However, we do not want those provider settings to
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// interfere with other parts of the system. Therefore, we make them local
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// to the Thread executing the JAR verification code.
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//
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// The code here is used by sun.security.util.SignatureFileVerifier.
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// See there for details.
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// Hardcoded names of providers to use for JAR verification.
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// MUST NOT be on the bootclasspath and not in signed JAR files.
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private static final String[] jarVerificationProviders = {
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"SUN",
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"SunRsaSign",
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// Note: when SunEC is in a signed JAR file, it's not signed
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// by EC algorithms. So it's still safe to be listed here.
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"SunEC",
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"SunJCE",
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};
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// Return Sun provider.
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// This method should only be called by
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// sun.security.util.ManifestEntryVerifier and java.security.SecureRandom.
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public static Provider getSunProvider() {
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return new sun.security.provider.Sun();
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}
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/**
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* Start JAR verification. This sets a special provider list for
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* the current thread. You MUST save the return value from this
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* method, and you MUST call stopJarVerification() with that object
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* once you are done.
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*/
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public static Object startJarVerification() {
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ProviderList currentList = getProviderList();
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ProviderList jarList = currentList.getJarList(jarVerificationProviders);
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if (jarList.getProvider("SUN") == null) {
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// add backup provider
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Provider p;
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try {
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p = new sun.security.provider.VerificationProvider();
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} catch (Exception e) {
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throw new RuntimeException("Missing provider for jar verification", e);
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}
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ProviderList.add(jarList, p);
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}
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// return the old thread-local provider list, usually null
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return beginThreadProviderList(jarList);
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}
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/**
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* Stop JAR verification. Call once you have completed JAR verification.
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*/
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public static void stopJarVerification(Object obj) {
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// restore old thread-local provider list
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endThreadProviderList((ProviderList)obj);
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}
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/**
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* Return the current ProviderList. If the thread-local list is set,
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* it is returned. Otherwise, the system-wide list is returned.
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*/
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public static ProviderList getProviderList() {
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ProviderList list = getThreadProviderList();
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if (list == null) {
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list = getSystemProviderList();
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}
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return list;
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}
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/**
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* Set the current ProviderList. Affects the thread-local list if set,
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* otherwise the system-wide list.
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*/
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public static void setProviderList(ProviderList newList) {
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if (getThreadProviderList() == null) {
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setSystemProviderList(newList);
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} else {
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changeThreadProviderList(newList);
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}
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clearCachedValues();
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}
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/**
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* Clears the cached provider-list-specific values. These values need to
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* be re-generated whenever provider list is changed. The logic for
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* generating them is in the respective classes.
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*/
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private static void clearCachedValues() {
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JCAUtil.clearDefSecureRandom();
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AlgorithmId.clearAliasOidsTable();
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}
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/**
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* Get the full provider list with invalid providers (those that
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* could not be loaded) removed. This is the list we need to
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* present to applications.
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*/
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public static ProviderList getFullProviderList() {
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ProviderList list;
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synchronized (Providers.class) {
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list = getThreadProviderList();
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if (list != null) {
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ProviderList newList = list.removeInvalid();
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if (newList != list) {
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changeThreadProviderList(newList);
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list = newList;
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}
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return list;
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}
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}
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list = getSystemProviderList();
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ProviderList newList = list.removeInvalid();
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if (newList != list) {
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setSystemProviderList(newList);
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list = newList;
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}
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return list;
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}
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private static ProviderList getSystemProviderList() {
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return providerList;
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}
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private static void setSystemProviderList(ProviderList list) {
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providerList = list;
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}
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public static ProviderList getThreadProviderList() {
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// avoid accessing the threadlocal if none are currently in use
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// (first use of ThreadLocal.get() for a Thread allocates a Map)
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if (threadListsUsed == 0) {
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return null;
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}
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return threadLists.get();
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}
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// Change the thread local provider list. Use only if the current thread
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// is already using a thread local list and you want to change it in place.
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// In other cases, use the begin/endThreadProviderList() methods.
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private static void changeThreadProviderList(ProviderList list) {
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threadLists.set(list);
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}
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/**
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* Methods to manipulate the thread local provider list. It is for use by
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* JAR verification (see above).
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*
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* It should be used as follows:
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*
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* ProviderList list = ...;
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* ProviderList oldList = Providers.beginThreadProviderList(list);
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* try {
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* // code that needs thread local provider list
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* } finally {
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* Providers.endThreadProviderList(oldList);
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* }
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*
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*/
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public static synchronized ProviderList beginThreadProviderList(ProviderList list) {
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if (ProviderList.debug != null) {
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ProviderList.debug.println("ThreadLocal providers: " + list);
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}
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ProviderList oldList = threadLists.get();
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threadListsUsed++;
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threadLists.set(list);
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return oldList;
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}
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public static synchronized void endThreadProviderList(ProviderList list) {
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if (list == null) {
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if (ProviderList.debug != null) {
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ProviderList.debug.println("Disabling ThreadLocal providers");
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}
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threadLists.remove();
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} else {
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if (ProviderList.debug != null) {
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ProviderList.debug.println
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("Restoring previous ThreadLocal providers: " + list);
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}
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threadLists.set(list);
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}
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threadListsUsed--;
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}
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}
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