/*

 * Copyright (c) 1999, 2016, 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.ssl;

import java.security.*;

/**

 * The JSSE provider.

 *

 * The RSA implementation has been removed from JSSE, but we still need to

 * register the same algorithms for compatibility. We just point to the RSA

 * implementation in the SunRsaSign provider. This works because all classes

 * are in the bootclasspath and therefore loaded by the same classloader.

 *

 * SunJSSE now supports an experimental FIPS compliant mode when used with an

 * appropriate FIPS certified crypto provider. In FIPS mode, we:

 *  . allow only TLS 1.0 or later

 *  . allow only FIPS approved ciphersuites

 *  . perform all crypto in the FIPS crypto provider

 *

 * It is currently not possible to use both FIPS compliant SunJSSE and

 * standard JSSE at the same time because of the various static data structures

 * we use.

 *

 * However, we do want to allow FIPS mode to be enabled at runtime and without

 * editing the java.security file. That means we need to allow

 * Security.removeProvider("SunJSSE") to work, which creates an instance of

 * this class in non-FIPS mode. That is why we delay the selection of the mode

 * as long as possible. This is until we open an SSL/TLS connection and the

 * data structures need to be initialized or until SunJSSE is initialized in

 * FIPS mode.

 *

 */

public abstract class SunJSSE extends java.security.Provider {

    private static final long serialVersionUID = 3231825739635378733L;

    private static String info = "Sun JSSE provider" +

        "(PKCS12, SunX509/PKIX key/trust factories, " +

        "SSLv3/TLSv1/TLSv1.1/TLSv1.2/DTLSv1.0/DTLSv1.2)";

    private static String fipsInfo =

        "Sun JSSE provider (FIPS mode, crypto provider ";

    // tri-valued flag:

    // null  := no final decision made

    // false := data structures initialized in non-FIPS mode

    // true  := data structures initialized in FIPS mode

    private static Boolean fips;

    // the FIPS certificate crypto provider that we use to perform all crypto

    // operations. null in non-FIPS mode

    static java.security.Provider cryptoProvider;

    protected static synchronized boolean isFIPS() {

        if (fips == null) {

            fips = false;

        }

        return fips;

    }

    // ensure we can use FIPS mode using the specified crypto provider.

    // enable FIPS mode if not already enabled.

    private static synchronized void ensureFIPS(java.security.Provider p) {

        if (fips == null) {

            fips = true;

            cryptoProvider = p;

        } else {

            if (fips == false) {

                throw new ProviderException

                    ("SunJSSE already initialized in non-FIPS mode");

            }

            if (cryptoProvider != p) {

                throw new ProviderException

                    ("SunJSSE already initialized with FIPS crypto provider "

                    + cryptoProvider);

            }

        }

    }

    // standard constructor

    protected SunJSSE() {

        subclassCheck();

        if (Boolean.TRUE.equals(fips)) {

            throw new ProviderException

                ("SunJSSE is already initialized in FIPS mode");

        }

        registerAlgorithms(false);

    }

    // preferred constructor to enable FIPS mode at runtime

    protected SunJSSE(java.security.Provider cryptoProvider){

        this(checkNull(cryptoProvider), cryptoProvider.getName());

    }

    // constructor to enable FIPS mode from java.security file

    protected SunJSSE(String cryptoProvider){

        this(null, checkNull(cryptoProvider));

    }

    private static <T> T checkNull(T t) {

        if (t == null) {

            throw new ProviderException("cryptoProvider must not be null");

        }

        return t;

    }

    private SunJSSE(java.security.Provider cryptoProvider,

            String providerName) {

        subclassCheck();

        if (cryptoProvider == null) {

            // Calling Security.getProvider() will cause other providers to be

            // loaded. That is not good but unavoidable here.

            cryptoProvider = Security.getProvider(providerName);

            if (cryptoProvider == null) {

                throw new ProviderException

                    ("Crypto provider not installed: " + providerName);

            }

        }

        ensureFIPS(cryptoProvider);

        registerAlgorithms(true);

    }

    private void registerAlgorithms(final boolean isfips) {

        AccessController.doPrivileged(new PrivilegedAction<>() {

            @Override

            public Object run() {

                doRegister(isfips);

                return null;

            }

        });

    }

    private void doRegister(boolean isfips) {

        if (isfips == false) {

            put("KeyFactory.RSA",

                "sun.security.rsa.RSAKeyFactory");

            put("Alg.Alias.KeyFactory.1.2.840.113549.1.1", "RSA");

            put("Alg.Alias.KeyFactory.OID.1.2.840.113549.1.1", "RSA");

            put("KeyPairGenerator.RSA",

                "sun.security.rsa.RSAKeyPairGenerator");

            put("Alg.Alias.KeyPairGenerator.1.2.840.113549.1.1", "RSA");

            put("Alg.Alias.KeyPairGenerator.OID.1.2.840.113549.1.1", "RSA");

            put("Signature.MD2withRSA",

                "sun.security.rsa.RSASignature$MD2withRSA");

            put("Alg.Alias.Signature.1.2.840.113549.1.1.2", "MD2withRSA");

            put("Alg.Alias.Signature.OID.1.2.840.113549.1.1.2",

                "MD2withRSA");

            put("Signature.MD5withRSA",

                "sun.security.rsa.RSASignature$MD5withRSA");

            put("Alg.Alias.Signature.1.2.840.113549.1.1.4", "MD5withRSA");

            put("Alg.Alias.Signature.OID.1.2.840.113549.1.1.4",

                "MD5withRSA");

            put("Signature.SHA1withRSA",

                "sun.security.rsa.RSASignature$SHA1withRSA");

            put("Alg.Alias.Signature.1.2.840.113549.1.1.5", "SHA1withRSA");

            put("Alg.Alias.Signature.OID.1.2.840.113549.1.1.5",

                "SHA1withRSA");

            put("Alg.Alias.Signature.1.3.14.3.2.29", "SHA1withRSA");

            put("Alg.Alias.Signature.OID.1.3.14.3.2.29", "SHA1withRSA");

        }

        put("Signature.MD5andSHA1withRSA",

            "sun.security.ssl.RSASignature");

        put("KeyManagerFactory.SunX509",

            "sun.security.ssl.KeyManagerFactoryImpl$SunX509");

        put("KeyManagerFactory.NewSunX509",

            "sun.security.ssl.KeyManagerFactoryImpl$X509");

        put("Alg.Alias.KeyManagerFactory.PKIX", "NewSunX509");

        put("TrustManagerFactory.SunX509",

            "sun.security.ssl.TrustManagerFactoryImpl$SimpleFactory");

        put("TrustManagerFactory.PKIX",

            "sun.security.ssl.TrustManagerFactoryImpl$PKIXFactory");

        put("Alg.Alias.TrustManagerFactory.SunPKIX", "PKIX");

        put("Alg.Alias.TrustManagerFactory.X509", "PKIX");

        put("Alg.Alias.TrustManagerFactory.X.509", "PKIX");

        put("SSLContext.TLSv1",

            "sun.security.ssl.SSLContextImpl$TLS10Context");

        put("SSLContext.TLSv1.1",

            "sun.security.ssl.SSLContextImpl$TLS11Context");

        put("SSLContext.TLSv1.2",

            "sun.security.ssl.SSLContextImpl$TLS12Context");

        put("SSLContext.TLS",

            "sun.security.ssl.SSLContextImpl$TLSContext");

        if (isfips == false) {

            put("Alg.Alias.SSLContext.SSL", "TLS");

            put("Alg.Alias.SSLContext.SSLv3", "TLSv1");

        }

        put("SSLContext.DTLSv1.0",

            "sun.security.ssl.SSLContextImpl$DTLS10Context");

        put("SSLContext.DTLSv1.2",

            "sun.security.ssl.SSLContextImpl$DTLS12Context");

        put("SSLContext.DTLS",

            "sun.security.ssl.SSLContextImpl$DTLSContext");

        put("SSLContext.Default",

            "sun.security.ssl.SSLContextImpl$DefaultSSLContext");

        /*

         * KeyStore

         */

        put("KeyStore.PKCS12",

            "sun.security.pkcs12.PKCS12KeyStore");

    }

    // com.sun.net.ssl.internal.ssl.Provider has been deprecated since JDK 9

    @SuppressWarnings("deprecation")

    private void subclassCheck() {

        if (getClass() != com.sun.net.ssl.internal.ssl.Provider.class) {

            throw new AssertionError("Illegal subclass: " + getClass());

        }

    }

    @Override

    protected final void finalize() throws Throwable {

        // empty

        super.finalize();

    }

}