Could not connect to SMTP host,PKIX path building failed,unable to find valid certification path...

系统管理员 2022-07-20 12:30 346阅读 0赞

java发邮件时遇到的问题

公司最近将邮件系统进行了升级，升级之后的邮件必须采用邮件加密传输通道。也就是ssl登录。

之前写的普通登录也将无法使用。今天在修改程序的过程中出现了一些问题，最终都顺利解决了，记录一下。

登录方式

普通登录

  1. <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
  2.         <property name="host" value="${mail.smtp.host}" />
  3.         <property name="javaMailProperties">
  4.             <props>
  5.                 <prop key="mail.smtp.auth">${mail.smtp.auth}</prop>
  6.                 <prop key="mail.smtp.timeout">${mail.smtp.timeout}</prop>
  7.             </props>
  8.         </property>
  9.         <property name="username" value="${mail.smtp.username}" />
  10.         <property name="password" value="${mail.smtp.password}" />
  11.     </bean>

ssl登录

  1. <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
  2.         <property name="host" value="${mail.smtp.host}" />
  3.         <property name="port" value="${mail.smtp.port}" />
  4.         <property name="username" value="${mail.smtp.username}" />
  5.         <property name="password" value="${mail.smtp.password}" />
  6.         <property name="javaMailProperties">
  7.             <props>
  8.                 <prop key="mail.smtp.timeout">${mail.smtp.timeout}</prop>
  9.                 <prop key="mail.smtp.auth">${mail.smtp.auth}</prop>
  10.                 <prop key="mail.smtp.starttls.enable">${mail.smtp.starttls.enable}</prop>
  11.                 <prop key="mail.smtp.socketFactory.port">${mail.smtp.port}</prop>
  12.                 <prop key="mail.smtp.socketFactory.class">javax.net.ssl.SSLSocketFactory</prop>
  13.                 <prop key="mail.smtp.socketFactory.fallback">false</prop>
  14.             </props>
  15.         </property>
  16. </bean>

配置文件

  1. #------------------------------------------------------------------------------------
  2. # 邮件服务的配置
  3. #------------------------------------------------------------------------------------
  4. #服务器
  5. mail.smtp.host=smtp.abc.com
  6. #端口号，QQ邮箱需要使用SSL，端口号465或587，其他邮箱默认的端口号：25
  7. mail.smtp.port=465
  8. #STARTTLS是对纯文本通信协议的扩展。它提供一种方式将纯文本连接升级为加密连接（TLS或SSL）
  9. mail.smtp.starttls.enable=true
  10. #是否需要验证密码
  11. mail.smtp.auth=true
  12. #超时时间
  13. mail.smtp.timeout=50000
  14. #------------------------------------------------------------------------------------
  15. # 加解密密钥 不能给出
  16. # 对用户名和密码都进行了加密 加解密工具在DESUtil中
  17. #------------------------------------------------------------------------------------
  18. #登陆用户名 我是随便写的
  19. mail.smtp.username=CBoch2LlydMW2432VYReDe4tjvJRstAmCoE123111
  20. #密码 qq为授权码 111111我是随便写的
  21. mail.smtp.password=avq5JeBiMuNr5F4wclLZZA==

改为ssl后遇到的问题

  1. Mail server connection failed; nested exception is javax.mail.MessagingException: Could not connect to SMTP host: smtp.abc.com, port: 465;
  3. nested exception is:
  4. javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Failed messages: javax.mail.MessagingException: Could not connect to SMTP host: smtp.abc.com, port: 465;
  6. nested exception is:
  7. javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

错误为：

  1. Could not connect to SMTP host: smtp.abc.com, port: 465
  2. PKIX path building failed
  3. unable to find valid certification path to requested target

其中1和2是由3引起的

现在问题就是解决

  1. unable to find valid certification path to requested target

网上有两种解决方案

1 安装数字证书
2 生成证书

我把公司的数字证书安装后没有解决问题，采用第二种方法解决

参考文献
http://www.tuicool.com/articles/zUjiIb

其中这篇文章中有一个地方在邮件系统中需要注意
url需要加上端口号

这里写图片描述

看到如下信息表示成功地生成了证书

这里写图片描述

将生成的jssecacerts文件拷贝到%JAVA_HONME%\jre\lib\security\目录下就ok了。

这里写图片描述

附上InstallCert.java

  1. /* * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
  3. import java.io.BufferedReader;
  4. import java.io.File;
  5. import java.io.FileInputStream;
  6. import java.io.FileOutputStream;
  7. import java.io.InputStream;
  8. import java.io.InputStreamReader;
  9. import java.io.OutputStream;
  10. import java.security.KeyStore;
  11. import java.security.MessageDigest;
  12. import java.security.cert.CertificateException;
  13. import java.security.cert.X509Certificate;
  15. import javax.net.ssl.SSLContext;
  16. import javax.net.ssl.SSLException;
  17. import javax.net.ssl.SSLSocket;
  18. import javax.net.ssl.SSLSocketFactory;
  19. import javax.net.ssl.TrustManager;
  20. import javax.net.ssl.TrustManagerFactory;
  21. import javax.net.ssl.X509TrustManager;
  23. public class InstallCert {
  25.     public static void main(String[] args) throws Exception {
  26.         String host;
  27.         int port;
  28.         char[] passphrase;
  29.         if ((args.length == 1) || (args.length == 2)) {
  30.             String[] c = args[0].split(":");
  31.             host = c[0];
  32.             port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
  33.             String p = (args.length == 1) ? "changeit" : args[1];
  34.             passphrase = p.toCharArray();
  35.         } else {
  36.             System.out
  37.                     .println("Usage: java InstallCert <host>[:port] [passphrase]");
  38.             return;
  39.         }
  41.         File file = new File("jssecacerts");
  42.         if (file.isFile() == false) {
  43.             char SEP = File.separatorChar;
  44.             File dir = new File(System.getProperty("java.home") + SEP + "lib"
  45.                     + SEP + "security");
  46.             file = new File(dir, "jssecacerts");
  47.             if (file.isFile() == false) {
  48.                 file = new File(dir, "cacerts");
  49.             }
  50.         }
  51.         System.out.println("Loading KeyStore " + file + "...");
  52.         InputStream in = new FileInputStream(file);
  53.         KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
  54.         ks.load(in, passphrase);
  55.         in.close();
  57.         SSLContext context = SSLContext.getInstance("TLS");
  58.         TrustManagerFactory tmf = TrustManagerFactory
  59.                 .getInstance(TrustManagerFactory.getDefaultAlgorithm());
  60.         tmf.init(ks);
  61.         X509TrustManager defaultTrustManager = (X509TrustManager) tmf
  62.                 .getTrustManagers()[0];
  63.         SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
  64.         context.init(null, new TrustManager[] { tm }, null);
  65.         SSLSocketFactory factory = context.getSocketFactory();
  67.         System.out
  68.                 .println("Opening connection to " + host + ":" + port + "...");
  69.         SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
  70.         socket.setSoTimeout(10000);
  71.         try {
  72.             System.out.println("Starting SSL handshake...");
  73.             socket.startHandshake();
  74.             socket.close();
  75.             System.out.println();
  76.             System.out.println("No errors, certificate is already trusted");
  77.         } catch (SSLException e) {
  78.             System.out.println();
  79.             e.printStackTrace(System.out);
  80.         }
  82.         X509Certificate[] chain = tm.chain;
  83.         if (chain == null) {
  84.             System.out.println("Could not obtain server certificate chain");
  85.             return;
  86.         }
  88.         BufferedReader reader = new BufferedReader(new InputStreamReader(
  89.                 System.in));
  91.         System.out.println();
  92.         System.out.println("Server sent " + chain.length + " certificate(s):");
  93.         System.out.println();
  94.         MessageDigest sha1 = MessageDigest.getInstance("SHA1");
  95.         MessageDigest md5 = MessageDigest.getInstance("MD5");
  96.         for (int i = 0; i < chain.length; i++) { 
  97.             X509Certificate cert = chain[i];
  98.             System.out.println(" " + (i + 1) + " Subject "
  99.                     + cert.getSubjectDN());
  100.             System.out.println(" Issuer " + cert.getIssuerDN());
  101.             sha1.update(cert.getEncoded());
  102.             System.out.println(" sha1 " + toHexString(sha1.digest()));
  103.             md5.update(cert.getEncoded());
  104.             System.out.println(" md5 " + toHexString(md5.digest()));
  105.             System.out.println();
  106.         }
  108.         System.out
  109.                 .println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
  110.         String line = reader.readLine().trim();
  111.         int k;
  112.         try {
  113.             k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
  114.         } catch (NumberFormatException e) {
  115.             System.out.println("KeyStore not changed");
  116.             return;
  117.         }
  119.         X509Certificate cert = chain[k];
  120.         String alias = host + "-" + (k + 1);
  121.         ks.setCertificateEntry(alias, cert);
  123.         OutputStream out = new FileOutputStream("jssecacerts");
  124.         ks.store(out, passphrase);
  125.         out.close();
  127.         System.out.println();
  128.         System.out.println(cert);
  129.         System.out.println();
  130.         System.out
  131.                 .println("Added certificate to keystore 'jssecacerts' using alias '"
  132.                         + alias + "'");
  133.     }
  135.     private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();
  137.     private static String toHexString(byte[] bytes) {
  138.         StringBuilder sb = new StringBuilder(bytes.length * 3);
  139.         for (int b : bytes) {
  140.             b &= 0xff;
  141.             sb.append(HEXDIGITS[b >> 4]);
  142.             sb.append(HEXDIGITS[b & 15]);
  143.             sb.append(' ');
  144.         }
  145.         return sb.toString();
  146.     }
  148.     private static class SavingTrustManager implements X509TrustManager {
  150.         private final X509TrustManager tm;
  151.         private X509Certificate[] chain;
  153.         SavingTrustManager(X509TrustManager tm) {
  154.             this.tm = tm;
  155.         }
  157.         public X509Certificate[] getAcceptedIssuers() {
  158.             throw new UnsupportedOperationException();
  159.         }
  161.         public void checkClientTrusted(X509Certificate[] chain, String authType)
  162.                 throws CertificateException {
  163.             throw new UnsupportedOperationException();
  164.         }
  166.         public void checkServerTrusted(X509Certificate[] chain, String authType)
  167.                 throws CertificateException {
  168.             this.chain = chain;
  169.             tm.checkServerTrusted(chain, authType);
  170.         }
  171.     }
  173. }

注意

不能将在自己电脑上生成的jssecacerts文件拷贝到服务器上去，如果拷贝上去不会起作用，仍然会报错。
服务器必须编译InstallCert.java，去生成jssecacerts文件。

参考文献

1.解决PKIX问题：unable to find valid certification path to requested target

2.Java发邮件-QQ服务器认证（A secure connection is requiered(such as ssl)）

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