解决 PKIX:unable to find valid certification path to requested target

作者:Rui 发布时间:January 26, 2016 分类:JAVA 浏览:1,559

错误原因:

Java在访问SSL加密的网站时,需要从JDK的KeyStore 里面去查找相对应得可信证书,如果不能从默认或者指定的KeyStore 中找到可信证书,就会报这个错误。另外,Java所使用的证书仓库并不是Windows系统自带的证书管理。所以即使系统中包含此证书也不可以使用。

解决方案:

只要将SSL的证书添加到KeyStore中即可,以下是两种解决方案。

借助Keytool导入证书:

下载你所访问的SSL站点的证书, 执行以下命令导入

keytool -keystore "C:\Program Files\Java\jdk1.8.0_71\jre\lib\security\cacerts" -importcert -alias WoSign -file WS_CA1_NEW.cer

接下来 会提示输入密码,默认密码为 changeit,输入之后,选择‘是’将其安装到JDK 可信证书库中。
如果看到以下结果,则导入成功。
Image.png

使用程序导入证书:

/*
 *
 *  * Copyright (c) 2015-2020, Chen Rui
 *  *
 *  * Licensed 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 com.vnet.demo.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

/**
 * Install Cert Tools
 *
 * Usage: java InstallCert <host>[:port] [passphrase]
 *
 * @author Chen Rui
 *
 */
public class InstallCert {

    public static void main(String[] args) throws Exception {
        if ((args.length == 1) || (args.length == 2)) {
            String url = args[0];
            String p = (args.length == 1) ? "changeit" : args[1];
            char[] passphrase = p.toCharArray();

            doInstall(url, passphrase);
        } else {
            System.out.println("Usage: java InstallCert <host>[:port] [passphrase]");
            return;
        }
    }

    protected static void doInstall(String url, char[] passphrase) throws Exception {
        String[] c = url.split(":");
        String host = c[0];
        int port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
        File file = new File("jssecacerts");
        if (file.isFile() == false) {
            char SEP = File.separatorChar;
            File dir = new File(System.getProperty("java.home") + SEP + "lib"  + SEP + "security");
            file = new File(dir, "jssecacerts");
            if (file.isFile() == false) {
                file = new File(dir, "cacerts");
            }
        }
        System.out.println("Loading KeyStore " + file + "...");
        InputStream in = new FileInputStream(file);
        KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
        ks.load(in, passphrase);
        in.close();

        SSLContext context = SSLContext.getInstance("TLS");
        TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        tmf.init(ks);
        X509TrustManager defaultTrustManager = (X509TrustManager) tmf
                .getTrustManagers()[0];
        SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
        context.init(null, new TrustManager[] { tm }, null);
        SSLSocketFactory factory = context.getSocketFactory();

        System.out.println("Opening connection to " + host + ":" + port + "...");
        SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
        socket.setSoTimeout(10000);
        try {
            System.out.println("Starting SSL handshake...");
            socket.startHandshake();
            socket.close();
            System.out.println();
            System.out.println("No errors, certificate is already trusted");
        } catch (SSLException e) {
            System.out.println();
            e.printStackTrace(System.out);
        }

        X509Certificate[] chain = tm.chain;
        if (chain == null) {
            System.out.println("Could not obtain server certificate chain");
            return;
        }

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        System.out.println();
        System.out.println("Server sent " + chain.length + " certificate(s):");
        System.out.println();
        MessageDigest sha1 = MessageDigest.getInstance("SHA1");
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        for (int i = 0; i < chain.length; i++) {
            X509Certificate cert = chain[i];
            System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());
            System.out.println("   Issuer  " + cert.getIssuerDN());
            sha1.update(cert.getEncoded());
            System.out.println("   sha1    " + toHexString(sha1.digest()));
            md5.update(cert.getEncoded());
            System.out.println("   md5     " + toHexString(md5.digest()));
            System.out.println();
        }

        for (int i = 0; i < chain.length; i++) {
            X509Certificate cert = chain[i];
            String alias = host + "-" + (i + 1);
            ks.setCertificateEntry(alias, cert);

            OutputStream out = new FileOutputStream("jssecacerts");
            ks.store(out, passphrase);
            out.close();

            System.out.println();
            System.out.println(cert);
            System.out.println();
            System.out.println("Added certificate to keystore 'jssecacerts' using alias '" + alias + "'");
        }
    }

    private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();

    private static String toHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder(bytes.length * 3);
        for (int b : bytes) {
            b &= 0xff;
            sb.append(HEXDIGITS[b >> 4]);
            sb.append(HEXDIGITS[b & 15]);
            sb.append(' ');
        }
        return sb.toString();
    }

    private static class SavingTrustManager implements X509TrustManager {

        private final X509TrustManager tm;
        private X509Certificate[] chain;

        SavingTrustManager(X509TrustManager tm) {
            this.tm = tm;
        }

        public X509Certificate[] getAcceptedIssuers() {
            throw new UnsupportedOperationException();
        }

        public void checkClientTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
            throw new UnsupportedOperationException();
        }

        public void checkServerTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
            this.chain = chain;
            tm.checkServerTrusted(chain, authType);
        }
    }

}

调用一下代码下载安装证书:

InstallCert.doInstall("kevinbus.servicebus.chinacloudapi.cn", "changeit".toCharArray());

或者执行

java InstallCert kevinbus.servicebus.chinacloudapi.cn

执行完成后,会生成jssecacerts 文件,将其copy到JAVA_HOME/jre/lib/security目录下。

标签: azure, cloud computer

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