/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tomcat.util.net;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyStore;
import java.security.cert.X509Certificate;
import java.util.Locale;

import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.catalina.Context;
import org.apache.catalina.authenticator.SSLAuthenticator;
import org.apache.catalina.connector.Connector;
import org.apache.catalina.core.AprLifecycleListener;
import org.apache.catalina.startup.TesterMapRealm;
import org.apache.catalina.startup.Tomcat;
import org.apache.tomcat.jni.SSL;
import org.apache.tomcat.util.descriptor.web.LoginConfig;
import org.apache.tomcat.util.descriptor.web.SecurityCollection;
import org.apache.tomcat.util.descriptor.web.SecurityConstraint;

public final class TesterSupport {

    public static final String SSL_DIR = "test/org/apache/tomcat/util/net/";
    public static final String CA_ALIAS = "ca";
    public static final String CA_JKS = SSL_DIR + CA_ALIAS + ".jks";
    public static final String CLIENT_ALIAS = "user1";
    public static final String CLIENT_JKS = SSL_DIR + CLIENT_ALIAS + ".jks";
    public static final String LOCALHOST_JKS = SSL_DIR + "localhost.jks";
    public static final String LOCALHOST_KEYPASS_JKS = SSL_DIR + "localhost-copy1.jks";
    public static final String JKS_PASS = "changeit";
    public static final String JKS_KEY_PASS = "tomcatpass";
    public static final String LOCALHOST_CERT_PEM = SSL_DIR + "localhost-cert.pem";
    public static final String LOCALHOST_KEY_PEM = SSL_DIR + "localhost-key.pem";

    public static final String ROLE = "testrole";

    public static void initSsl(Tomcat tomcat) {
        initSsl(tomcat, LOCALHOST_JKS, null, null);
    }

    protected static void initSsl(Tomcat tomcat, String keystore,
            String keystorePass, String keyPass) {

        String protocol = tomcat.getConnector().getProtocolHandlerClassName();
        if (protocol.indexOf("Apr") == -1) {
            Connector connector = tomcat.getConnector();
            connector.setProperty("sslProtocol", "tls");
            File keystoreFile =
                new File(keystore);
            connector.setAttribute("keystoreFile",
                    keystoreFile.getAbsolutePath());
            File truststoreFile = new File(CA_JKS);
            connector.setAttribute("truststoreFile",
                    truststoreFile.getAbsolutePath());
            if (keystorePass != null) {
                connector.setAttribute("keystorePass", keystorePass);
            }
            if (keyPass != null) {
                connector.setAttribute("keyPass", keyPass);
            }
        } else {
            File keystoreFile = new File(
                    LOCALHOST_CERT_PEM);
            tomcat.getConnector().setAttribute("SSLCertificateFile",
                    keystoreFile.getAbsolutePath());
            keystoreFile = new File(
                    LOCALHOST_KEY_PEM);
            tomcat.getConnector().setAttribute("SSLCertificateKeyFile",
                    keystoreFile.getAbsolutePath());
        }
        tomcat.getConnector().setSecure(true);
        tomcat.getConnector().setProperty("SSLEnabled", "true");
        // OpenSSL before 1.0.1 only supports TLSv1.
        // Our default SSLProtocol setting "all" includes unsupported TLSv1.1 and 1.2
        // and would produce an error during init.
        // Trigger loading of the native library and choose old protocol
        // if we use old OpenSSL.
        if (AprLifecycleListener.isAprAvailable() && SSL.version() < 0x10001000L) {
            tomcat.getConnector().setProperty("SSLProtocol", Constants.SSL_PROTO_TLSv1);
        }
    }

    protected static KeyManager[] getUser1KeyManagers() throws Exception {
        KeyManagerFactory kmf = KeyManagerFactory.getInstance(
                KeyManagerFactory.getDefaultAlgorithm());
        kmf.init(getKeyStore(CLIENT_JKS), JKS_PASS.toCharArray());
        return kmf.getKeyManagers();
    }

    protected static TrustManager[] getTrustManagers() throws Exception {
        TrustManagerFactory tmf = TrustManagerFactory.getInstance(
                TrustManagerFactory.getDefaultAlgorithm());
        tmf.init(getKeyStore(CA_JKS));
        return tmf.getTrustManagers();
    }


    protected static void configureClientSsl() {
        try {
            SSLContext sc = SSLContext.getInstance("TLS");
            sc.init(TesterSupport.getUser1KeyManagers(),
                    TesterSupport.getTrustManagers(),
                    null);
            javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static KeyStore getKeyStore(String keystore) throws Exception {
        File keystoreFile = new File(keystore);
        KeyStore ks = KeyStore.getInstance("JKS");
        try (InputStream is = new FileInputStream(keystoreFile)) {
            ks.load(is, JKS_PASS.toCharArray());
        }
        return ks;
    }

    protected static boolean isMacOs() {
        return System.getProperty("os.name").toLowerCase(Locale.ENGLISH).startsWith("mac os x");
    }

    protected static boolean isRenegotiationSupported(Tomcat tomcat) {
        String protocol = tomcat.getConnector().getProtocolHandlerClassName();
        if (protocol.contains("Apr")) {
            // Disabled by default in 1.1.20 windows binary (2010-07-27)
            return false;
        }
        if (protocol.contains("NioProtocol") || (protocol.contains("Nio2Protocol") && isMacOs())) {
            // Doesn't work on all platforms - see BZ 56448.
            return false;
        }

        return true;
    }

    protected static void configureClientCertContext(Tomcat tomcat) {
        TesterSupport.initSsl(tomcat);

        // Need a web application with a protected and unprotected URL
        // No file system docBase required
        Context ctx = tomcat.addContext("", null);

        Tomcat.addServlet(ctx, "simple", new SimpleServlet());
        ctx.addServletMappingDecoded("/unprotected", "simple");
        ctx.addServletMappingDecoded("/protected", "simple");

        // Security constraints
        SecurityCollection collection = new SecurityCollection();
        collection.addPatternDecoded("/protected");
        SecurityConstraint sc = new SecurityConstraint();
        sc.addAuthRole(ROLE);
        sc.addCollection(collection);
        ctx.addConstraint(sc);

        // Configure the Realm
        TesterMapRealm realm = new TesterMapRealm();

        String cn = "NOTFOUND";
        try {
            KeyStore ks = getKeyStore(CLIENT_JKS);
            X509Certificate cert = (X509Certificate)ks.getCertificate(CLIENT_ALIAS);
            cn = cert.getSubjectDN().getName();
        } catch (Exception ex) {
            // Ignore
        }

        realm.addUser(cn, "not used");
        realm.addUserRole(cn, ROLE);
        ctx.setRealm(realm);

        // Configure the authenticator
        LoginConfig lc = new LoginConfig();
        lc.setAuthMethod("CLIENT-CERT");
        ctx.setLoginConfig(lc);
        ctx.getPipeline().addValve(new SSLAuthenticator());
    }

    public static final byte DATA = (byte)33;

    public static class SimpleServlet extends HttpServlet {

        private static final long serialVersionUID = 1L;

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {
            resp.setContentType("text/plain");
            resp.getWriter().print("OK");
            if (req.isUserInRole(ROLE)) {
                resp.getWriter().print("-" + ROLE);
            }
        }

        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {
            // Swallow any request body
            int read = 0;
            int len = 0;
            byte[] buffer = new byte[4096];
            InputStream is = req.getInputStream();
            boolean contentOK = true;
            while (len > -1) {
                len = is.read(buffer);
                read = read + len;
                for (int i=0; i<len && contentOK; i++) {
                    contentOK = (buffer[i] == DATA);
                }
            }
            // len will have been -1 on last iteration
            read++;

            // Report the number of bytes read
            resp.setContentType("text/plain");
            if (contentOK)
                resp.getWriter().print("OK-" + read);
            else
                resp.getWriter().print("CONTENT-MISMATCH-" + read);
        }
    }

    public static class TrustAllCerts implements X509TrustManager {

        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[0];
        }

        @Override
        public void checkClientTrusted(X509Certificate[] certs,
                String authType) {
            // NOOP - Trust everything
        }

        @Override
        public void checkServerTrusted(X509Certificate[] certs,
                String authType) {
            // NOOP - Trust everything
        }
    }
}