/*

 * Copyright (c) 2003, 2012, 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

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package sun.security.pkcs11;

import java.io.*;

import java.util.*;

import java.security.*;

import java.security.interfaces.*;

import javax.crypto.interfaces.*;

import javax.security.auth.Subject;

import javax.security.auth.login.LoginException;

import javax.security.auth.login.FailedLoginException;

import javax.security.auth.callback.Callback;

import javax.security.auth.callback.CallbackHandler;

import javax.security.auth.callback.ConfirmationCallback;

import javax.security.auth.callback.PasswordCallback;

import javax.security.auth.callback.TextOutputCallback;

import sun.security.util.Debug;

import sun.security.util.ResourcesMgr;

import sun.security.pkcs11.Secmod.*;

import sun.security.pkcs11.wrapper.*;

import static sun.security.pkcs11.wrapper.PKCS11Constants.*;

/**

 * PKCS#11 provider main class.

 *

 * @author  Andreas Sterbenz

 * @since   1.5

 */

public final class SunPKCS11 extends AuthProvider {

    private static final long serialVersionUID = -1354835039035306505L;

    static final Debug debug = Debug.getInstance("sunpkcs11");

    private static int dummyConfigId;

    // the PKCS11 object through which we make the native calls

    final PKCS11 p11;

    // name of the configuration file

    private final String configName;

    // configuration information

    final Config config;

    // id of the PKCS#11 slot we are using

    final long slotID;

    private CallbackHandler pHandler;

    private final Object LOCK_HANDLER = new Object();

    final boolean removable;

    final Module nssModule;

    final boolean nssUseSecmodTrust;

    private volatile Token token;

    private TokenPoller poller;

    Token getToken() {

        return token;

    }

    public SunPKCS11() {

        super("SunPKCS11-Dummy", 1.7d, "SunPKCS11-Dummy");

        throw new ProviderException

            ("SunPKCS11 requires configuration file argument");

    }

    public SunPKCS11(String configName) {

        this(checkNull(configName), null);

    }

    public SunPKCS11(InputStream configStream) {

        this(getDummyConfigName(), checkNull(configStream));

    }

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

        if (obj == null) {

            throw new NullPointerException();

        }

        return obj;

    }

    private static synchronized String getDummyConfigName() {

        int id = ++dummyConfigId;

        return "---DummyConfig-" + id + "---";

    }

    /**

     * @deprecated use new SunPKCS11(String) or new SunPKCS11(InputStream)

     *         instead

     */

    @Deprecated

    public SunPKCS11(String configName, InputStream configStream) {

        super("SunPKCS11-" +

            Config.getConfig(configName, configStream).getName(),

            1.7d, Config.getConfig(configName, configStream).getDescription());

        this.configName = configName;

        this.config = Config.removeConfig(configName);

        if (debug != null) {

            System.out.println("SunPKCS11 loading " + configName);

        }

        String library = config.getLibrary();

        String functionList = config.getFunctionList();

        long slotID = config.getSlotID();

        int slotListIndex = config.getSlotListIndex();

        boolean useSecmod = config.getNssUseSecmod();

        boolean nssUseSecmodTrust = config.getNssUseSecmodTrust();

        Module nssModule = null;

        //

        // Initialization via Secmod. The way this works is as follows:

        // SunPKCS11 is either in normal mode or in NSS Secmod mode.

        // Secmod is activated by specifying one or more of the following

        // options in the config file:

        // nssUseSecmod, nssSecmodDirectory, nssLibrary, nssModule

        //

        // XXX add more explanation here

        //

        // If we are in Secmod mode and configured to use either the

        // nssKeyStore or the nssTrustAnchors module, we automatically

        // switch to using the NSS trust attributes for trusted certs

        // (KeyStore).

        //

        if (useSecmod) {

            // note: Config ensures library/slot/slotListIndex not specified

            // in secmod mode.

            Secmod secmod = Secmod.getInstance();

            DbMode nssDbMode = config.getNssDbMode();

            try {

                String nssLibraryDirectory = config.getNssLibraryDirectory();

                String nssSecmodDirectory = config.getNssSecmodDirectory();

                if (secmod.isInitialized()) {

                    if (nssSecmodDirectory != null) {

                        String s = secmod.getConfigDir();

                        if ((s != null) &&

                                (s.equals(nssSecmodDirectory) == false)) {

                            throw new ProviderException("Secmod directory "

                                + nssSecmodDirectory

                                + " invalid, NSS already initialized with "

                                + s);

                        }

                    }

                    if (nssLibraryDirectory != null) {

                        String s = secmod.getLibDir();

                        if ((s != null) &&

                                (s.equals(nssLibraryDirectory) == false)) {

                            throw new ProviderException("NSS library directory "

                                + nssLibraryDirectory

                                + " invalid, NSS already initialized with "

                                + s);

                        }

                    }

                } else {

                    if (nssDbMode != DbMode.NO_DB) {

                        if (nssSecmodDirectory == null) {

                            throw new ProviderException(

                                "Secmod not initialized and "

                                 + "nssSecmodDirectory not specified");

                        }

                    } else {

                        if (nssSecmodDirectory != null) {

                            throw new ProviderException(

                                "nssSecmodDirectory must not be "

                                + "specified in noDb mode");

                        }

                    }

                    secmod.initialize(nssDbMode, nssSecmodDirectory,

                        nssLibraryDirectory);

                }

            } catch (IOException e) {

                // XXX which exception to throw

                throw new ProviderException("Could not initialize NSS", e);

            }

            List<Module> modules = secmod.getModules();

            if (config.getShowInfo()) {

                System.out.println("NSS modules: " + modules);

            }

            String moduleName = config.getNssModule();

            if (moduleName == null) {

                nssModule = secmod.getModule(ModuleType.FIPS);

                if (nssModule != null) {

                    moduleName = "fips";

                } else {

                    moduleName = (nssDbMode == DbMode.NO_DB) ?

                        "crypto" : "keystore";

                }

            }

            if (moduleName.equals("fips")) {

                nssModule = secmod.getModule(ModuleType.FIPS);

                nssUseSecmodTrust = true;

                functionList = "FC_GetFunctionList";

            } else if (moduleName.equals("keystore")) {

                nssModule = secmod.getModule(ModuleType.KEYSTORE);

                nssUseSecmodTrust = true;

            } else if (moduleName.equals("crypto")) {

                nssModule = secmod.getModule(ModuleType.CRYPTO);

            } else if (moduleName.equals("trustanchors")) {

                // XXX should the option be called trustanchor or trustanchors??

                nssModule = secmod.getModule(ModuleType.TRUSTANCHOR);

                nssUseSecmodTrust = true;

            } else if (moduleName.startsWith("external-")) {

                int moduleIndex;

                try {

                    moduleIndex = Integer.parseInt

                            (moduleName.substring("external-".length()));

                } catch (NumberFormatException e) {

                    moduleIndex = -1;

                }

                if (moduleIndex < 1) {

                    throw new ProviderException

                            ("Invalid external module: " + moduleName);

                }

                int k = 0;

                for (Module module : modules) {

                    if (module.getType() == ModuleType.EXTERNAL) {

                        if (++k == moduleIndex) {

                            nssModule = module;

                            break;

                        }

                    }

                }

                if (nssModule == null) {

                    throw new ProviderException("Invalid module " + moduleName

                        + ": only " + k + " external NSS modules available");

                }

            } else {

                throw new ProviderException(

                    "Unknown NSS module: " + moduleName);

            }

            if (nssModule == null) {

                throw new ProviderException(

                    "NSS module not available: " + moduleName);

            }

            if (nssModule.hasInitializedProvider()) {

                throw new ProviderException("Secmod module already configured");

            }

            library = nssModule.libraryName;

            slotListIndex = nssModule.slot;

        }

        this.nssUseSecmodTrust = nssUseSecmodTrust;

        this.nssModule = nssModule;

        File libraryFile = new File(library);

        // if the filename is a simple filename without path

        // (e.g. "libpkcs11.so"), it may refer to a library somewhere on the

        // OS library search path. Omit the test for file existance as that

        // only looks in the current directory.

        if (libraryFile.getName().equals(library) == false) {

            if (new File(library).isFile() == false) {

                String msg = "Library " + library + " does not exist";

                if (config.getHandleStartupErrors() == Config.ERR_HALT) {

                    throw new ProviderException(msg);

                } else {

                    throw new UnsupportedOperationException(msg);

                }

            }

        }

        try {

            if (debug != null) {

                debug.println("Initializing PKCS#11 library " + library);

            }

            CK_C_INITIALIZE_ARGS initArgs = new CK_C_INITIALIZE_ARGS();

            String nssArgs = config.getNssArgs();

            if (nssArgs != null) {

                initArgs.pReserved = nssArgs;

            }

            // request multithreaded access first

            initArgs.flags = CKF_OS_LOCKING_OK;

            PKCS11 tmpPKCS11;

            try {

                tmpPKCS11 = PKCS11.getInstance(

                    library, functionList, initArgs,

                    config.getOmitInitialize());

            } catch (PKCS11Exception e) {

                if (debug != null) {

                    debug.println("Multi-threaded initialization failed: " + e);

                }

                if (config.getAllowSingleThreadedModules() == false) {

                    throw e;

                }

                // fall back to single threaded access

                if (nssArgs == null) {

                    // if possible, use null initArgs for better compatibility

                    initArgs = null;

                } else {

                    initArgs.flags = 0;

                }

                tmpPKCS11 = PKCS11.getInstance(library,

                    functionList, initArgs, config.getOmitInitialize());

            }

            p11 = tmpPKCS11;

            CK_INFO p11Info = p11.C_GetInfo();

            if (p11Info.cryptokiVersion.major < 2) {

                throw new ProviderException("Only PKCS#11 v2.0 and later "

                + "supported, library version is v" + p11Info.cryptokiVersion);

            }

            boolean showInfo = config.getShowInfo();

            if (showInfo) {

                System.out.println("Information for provider " + getName());

                System.out.println("Library info:");

                System.out.println(p11Info);

            }

            if ((slotID < 0) || showInfo) {

                long[] slots = p11.C_GetSlotList(false);

                if (showInfo) {

                    System.out.println("All slots: " + toString(slots));

                    slots = p11.C_GetSlotList(true);

                    System.out.println("Slots with tokens: " + toString(slots));

                }

                if (slotID < 0) {

                    if ((slotListIndex < 0)

                            || (slotListIndex >= slots.length)) {

                        throw new ProviderException("slotListIndex is "

                            + slotListIndex

                            + " but token only has " + slots.length + " slots");

                    }

                    slotID = slots[slotListIndex];

                }

            }

            this.slotID = slotID;

            CK_SLOT_INFO slotInfo = p11.C_GetSlotInfo(slotID);

            removable = (slotInfo.flags & CKF_REMOVABLE_DEVICE) != 0;

            initToken(slotInfo);

            if (nssModule != null) {

                nssModule.setProvider(this);

            }

        } catch (Exception e) {

            if (config.getHandleStartupErrors() == Config.ERR_IGNORE_ALL) {

                throw new UnsupportedOperationException

                        ("Initialization failed", e);

            } else {

                throw new ProviderException

                        ("Initialization failed", e);

            }

        }

    }

    private static String toString(long[] longs) {

        if (longs.length == 0) {

            return "(none)";

        }

        StringBuilder sb = new StringBuilder();

        sb.append(longs[0]);

        for (int i = 1; i < longs.length; i++) {

            sb.append(", ");

            sb.append(longs[i]);

        }

        return sb.toString();

    }

    public boolean equals(Object obj) {

        return this == obj;

    }

    public int hashCode() {

        return System.identityHashCode(this);

    }

    }

    private static final class Descriptor {

        final String type;

        final String algorithm;

        final String className;

        final String[] aliases;

        final int[] mechanisms;

        private Descriptor(String type, String algorithm, String className,

                String[] aliases, int[] mechanisms) {

            this.type = type;

            this.algorithm = algorithm;

            this.className = className;

            this.aliases = aliases;

            this.mechanisms = mechanisms;

        }

        private P11Service service(Token token, int mechanism) {

            return new P11Service

                (token, type, algorithm, className, aliases, mechanism);

        }

        public String toString() {

            return type + "." + algorithm;

        }

    }

    // Map from mechanism to List of Descriptors that should be

    // registered if the mechanism is supported

    private final static Map<Integer,List<Descriptor>> descriptors =

        new HashMap<Integer,List<Descriptor>>();

    private static int[] m(long m1) {

        return new int[] {(int)m1};

    }

    private static int[] m(long m1, long m2) {

        return new int[] {(int)m1, (int)m2};

    }

    private static int[] m(long m1, long m2, long m3) {

        return new int[] {(int)m1, (int)m2, (int)m3};

    }

    private static int[] m(long m1, long m2, long m3, long m4) {

        return new int[] {(int)m1, (int)m2, (int)m3, (int)m4};

    }

    private static void d(String type, String algorithm, String className,

            int[] m) {

        register(new Descriptor(type, algorithm, className, null, m));

    }

    private static void d(String type, String algorithm, String className,

            String[] aliases, int[] m) {

        register(new Descriptor(type, algorithm, className, aliases, m));

    }

    private static void register(Descriptor d) {

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

            int m = d.mechanisms[i];

            Integer key = Integer.valueOf(m);

            List<Descriptor> list = descriptors.get(key);

            if (list == null) {

                list = new ArrayList<Descriptor>();

                descriptors.put(key, list);

            }

            list.add(d);

        }

    }

    private final static String MD  = "MessageDigest";

    private final static String SIG = "Signature";

    private final static String KPG = "KeyPairGenerator";

    private final static String KG  = "KeyGenerator";

    private final static String AGP = "AlgorithmParameters";

    private final static String KF  = "KeyFactory";

    private final static String SKF = "SecretKeyFactory";

    private final static String CIP = "Cipher";

    private final static String MAC = "Mac";

    private final static String KA  = "KeyAgreement";

    private final static String KS  = "KeyStore";

    private final static String SR  = "SecureRandom";

    static {

        // names of all the implementation classes

        // use local variables, only used here

        String P11Digest           = "sun.security.pkcs11.P11Digest";

        String P11MAC              = "sun.security.pkcs11.P11MAC";

        String P11KeyPairGenerator = "sun.security.pkcs11.P11KeyPairGenerator";

        String P11KeyGenerator     = "sun.security.pkcs11.P11KeyGenerator";

        String P11RSAKeyFactory    = "sun.security.pkcs11.P11RSAKeyFactory";

        String P11DSAKeyFactory    = "sun.security.pkcs11.P11DSAKeyFactory";

        String P11DHKeyFactory     = "sun.security.pkcs11.P11DHKeyFactory";

        String P11KeyAgreement     = "sun.security.pkcs11.P11KeyAgreement";

        String P11SecretKeyFactory = "sun.security.pkcs11.P11SecretKeyFactory";

        String P11Cipher           = "sun.security.pkcs11.P11Cipher";

        String P11RSACipher        = "sun.security.pkcs11.P11RSACipher";

        String P11Signature        = "sun.security.pkcs11.P11Signature";

        // XXX register all aliases

        d(MD, "MD2",            P11Digest,

                m(CKM_MD2));

        d(MD, "MD5",            P11Digest,

                m(CKM_MD5));

                m(CKM_SHA_1));