/*

 * Copyright (c) 1999, 2010, 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.util.*;

import java.io.*;

import java.math.*;

import java.security.*;

import java.security.cert.*;

import javax.net.ssl.*;

import java.security.spec.AlgorithmParameterSpec;

import sun.security.validator.Validator;

abstract class TrustManagerFactoryImpl extends TrustManagerFactorySpi {

    private static final Debug debug = Debug.getInstance("ssl");

    private X509TrustManager trustManager = null;

    private boolean isInitialized = false;

    TrustManagerFactoryImpl() {

        // empty

    }

    protected void engineInit(KeyStore ks) throws KeyStoreException {

        if (ks == null) {

            try {

                ks = getCacertsKeyStore("trustmanager");

            } catch (SecurityException se) {

                // eat security exceptions but report other throwables

                if (debug != null && Debug.isOn("trustmanager")) {

                    System.out.println(

                        "SunX509: skip default keystore: " + se);

                }

            } catch (Error err) {

                if (debug != null && Debug.isOn("trustmanager")) {

                    System.out.println(

                        "SunX509: skip default keystore: " + err);

                }

                throw err;

            } catch (RuntimeException re) {

                if (debug != null && Debug.isOn("trustmanager")) {

                    System.out.println(

                        "SunX509: skip default keystore: " + re);

                }

                throw re;

            } catch (Exception e) {

                if (debug != null && Debug.isOn("trustmanager")) {

                    System.out.println(

                        "SunX509: skip default keystore: " + e);

                }

                throw new KeyStoreException(

                    "problem accessing trust store" + e);

            }

        }

        trustManager = getInstance(ks);

        isInitialized = true;

    }

    abstract X509TrustManager getInstance(KeyStore ks) throws KeyStoreException;

    abstract X509TrustManager getInstance(ManagerFactoryParameters spec)

            throws InvalidAlgorithmParameterException;

    protected void engineInit(ManagerFactoryParameters spec) throws

            InvalidAlgorithmParameterException {

        trustManager = getInstance(spec);

        isInitialized = true;

    }

    /**

     * Returns one trust manager for each type of trust material.

     */

    protected TrustManager[] engineGetTrustManagers() {

        if (!isInitialized) {

            throw new IllegalStateException(

                        "TrustManagerFactoryImpl is not initialized");

        }

        return new TrustManager[] { trustManager };

    }

    /*

     * Try to get an InputStream based on the file we pass in.

     */

    private static FileInputStream getFileInputStream(final File file)

            throws Exception {

        return AccessController.doPrivileged(

                new PrivilegedExceptionAction<FileInputStream>() {

                    public FileInputStream run() throws Exception {

                        try {

                            if (file.exists()) {

                                return new FileInputStream(file);

                            } else {

                                return null;

                            }

                        } catch (FileNotFoundException e) {

                            // couldn't find it, oh well.

                            return null;

                        }

                    }

                });

    }

    /**

     * Returns the keystore with the configured CA certificates.

     */

    static KeyStore getCacertsKeyStore(String dbgname) throws Exception

    {

        String storeFileName = null;

        File storeFile = null;

        FileInputStream fis = null;

        String defaultTrustStoreType;

        String defaultTrustStoreProvider;

        final HashMap<String,String> props = new HashMap<>();

        final String sep = File.separator;

        KeyStore ks = null;

        AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() {

            public Void run() throws Exception {

                props.put("trustStore", System.getProperty(

                                "javax.net.ssl.trustStore"));

                props.put("javaHome", System.getProperty(

                                        "java.home"));

                props.put("trustStoreType", System.getProperty(

                                "javax.net.ssl.trustStoreType",

                                KeyStore.getDefaultType()));

                props.put("trustStoreProvider", System.getProperty(

                                "javax.net.ssl.trustStoreProvider", ""));

                props.put("trustStorePasswd", System.getProperty(

                                "javax.net.ssl.trustStorePassword", ""));

                return null;

            }

        });

        /*

         * Try:

         *      javax.net.ssl.trustStore  (if this variable exists, stop)

         *      jssecacerts

         *      cacerts

         *

         * If none exists, we use an empty keystore.

         */

        storeFileName = props.get("trustStore");

        if (!"NONE".equals(storeFileName)) {

            if (storeFileName != null) {

                storeFile = new File(storeFileName);

                fis = getFileInputStream(storeFile);

            } else {

                String javaHome = props.get("javaHome");

                storeFile = new File(javaHome + sep + "lib" + sep

                                                + "security" + sep +

                                                "jssecacerts");

                if ((fis = getFileInputStream(storeFile)) == null) {

                    storeFile = new File(javaHome + sep + "lib" + sep

                                                + "security" + sep +

                                                "cacerts");

                    fis = getFileInputStream(storeFile);

                }

            }

            if (fis != null) {

                storeFileName = storeFile.getPath();

            } else {

                storeFileName = "No File Available, using empty keystore.";

            }

        }

        defaultTrustStoreType = props.get("trustStoreType");

        defaultTrustStoreProvider = props.get("trustStoreProvider");

        if (debug != null && Debug.isOn(dbgname)) {

            System.out.println("trustStore is: " + storeFileName);

            System.out.println("trustStore type is : " +

                                defaultTrustStoreType);

            System.out.println("trustStore provider is : " +

                                defaultTrustStoreProvider);

        }

        /*

         * Try to initialize trust store.

         */

        if (defaultTrustStoreType.length() != 0) {

            if (debug != null && Debug.isOn(dbgname)) {

                System.out.println("init truststore");

            }

            if (defaultTrustStoreProvider.length() == 0) {

                ks = KeyStore.getInstance(defaultTrustStoreType);

            } else {

                ks = KeyStore.getInstance(defaultTrustStoreType,

                                        defaultTrustStoreProvider);

            }

            char[] passwd = null;

            String defaultTrustStorePassword = props.get("trustStorePasswd");

            if (defaultTrustStorePassword.length() != 0)

                passwd = defaultTrustStorePassword.toCharArray();

            // if trustStore is NONE, fis will be null

            ks.load(fis, passwd);

            // Zero out the temporary password storage

            if (passwd != null) {

                for (int i = 0; i < passwd.length; i++) {

                    passwd[i] = (char)0;

                }

            }

        }

        if (fis != null) {

            fis.close();

        }

        return ks;

    }

    public static final class SimpleFactory extends TrustManagerFactoryImpl {

        X509TrustManager getInstance(KeyStore ks) throws KeyStoreException {

            return new X509TrustManagerImpl(Validator.TYPE_SIMPLE, ks);

        }

        X509TrustManager getInstance(ManagerFactoryParameters spec)

                throws InvalidAlgorithmParameterException {

            throw new InvalidAlgorithmParameterException

                ("SunX509 TrustManagerFactory does not use "

                + "ManagerFactoryParameters");

        }

   }

    public static final class PKIXFactory extends TrustManagerFactoryImpl {

        X509TrustManager getInstance(KeyStore ks) throws KeyStoreException {

            return new X509TrustManagerImpl(Validator.TYPE_PKIX, ks);

        }

        X509TrustManager getInstance(ManagerFactoryParameters spec)

                throws InvalidAlgorithmParameterException {

            if (spec instanceof CertPathTrustManagerParameters == false) {

                throw new InvalidAlgorithmParameterException

                    ("Parameters must be CertPathTrustManagerParameters");

            }

            CertPathParameters params =

                ((CertPathTrustManagerParameters)spec).getParameters();

            if (params instanceof PKIXBuilderParameters == false) {

                throw new InvalidAlgorithmParameterException

                    ("Encapsulated parameters must be PKIXBuilderParameters");

            }

            PKIXBuilderParameters pkixParams = (PKIXBuilderParameters)params;

            return new X509TrustManagerImpl(Validator.TYPE_PKIX, pkixParams);

        }

    }

}