Could not connect to SMTP host,PKIX path building failed,unable to find valid certification path...
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
id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<property name="host" value="${mail.smtp.host}" />
<property name="javaMailProperties">
<prop key="mail.smtp.auth">${mail.smtp.auth}prop>
<prop key="mail.smtp.timeout">${mail.smtp.timeout}prop>
property>
<property name="username" value="${mail.smtp.username}" />
<property name="password" value="${mail.smtp.password}" />
ssl登录
id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<property name="host" value="${mail.smtp.host}" />
<property name="port" value="${mail.smtp.port}" />
<property name="username" value="${mail.smtp.username}" />
<property name="password" value="${mail.smtp.password}" />
<property name="javaMailProperties">
<prop key="mail.smtp.timeout">${mail.smtp.timeout}prop>
<prop key="mail.smtp.auth">${mail.smtp.auth}prop>
<prop key="mail.smtp.starttls.enable">${mail.smtp.starttls.enable}prop>
<prop key="mail.smtp.socketFactory.port">${mail.smtp.port}prop>
<prop key="mail.smtp.socketFactory.class">javax.net.ssl.SSLSocketFactoryprop>
<prop key="mail.smtp.socketFactory.fallback">falseprop>
property>
配置文件
#------------------------------------------------------------------------------------
# 邮件服务的配置
#------------------------------------------------------------------------------------
#服务器
mail.smtp.host=smtp.abc.com
#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
mail.smtp.port=465
#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）
mail.smtp.starttls.enable=true
#是否需要验证密码
mail.smtp.auth=true
#超时时间
mail.smtp.timeout=50000
#------------------------------------------------------------------------------------
# 加解密密钥 不能给出
# 对用户名和密码都进行了加密 加解密工具在DESUtil中
#------------------------------------------------------------------------------------
#登陆用户名 我是随便写的
mail.smtp.username=CBoch2LlydMW2432VYReDe4tjvJRstAmCoE123111
#密码 qq为授权码 111111我是随便写的
mail.smtp.password=avq5JeBiMuNr5F4wclLZZA==改为ssl后遇到的问题
Mail server connection failed; nested exception is javax.mail.MessagingException: Could not connect to SMTP host: smtp.abc.com, port: 465;
nested exception is:
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;
nested exception is:
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：
- Could not connect to SMTP host: smtp.abc.com, port: 465
- PKIX path building failed
- 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
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
看到如下信息表示成功地生成了证书
将生成的jssecacerts文件拷贝到%JAVA_HONME%\jre\lib\security\目录下就ok了。
附上InstallCert.java
/*
* 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.
*/
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;
public class InstallCert {
public static void main(String[] args) throws Exception {
String host;
int port;
char[] passphrase;
if ((args.length == 1) || (args.length == 2)) {
String[] c = args[0].split(":");
host = c[0];
port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
String p = (args.length == 1) ? "changeit" : args[1];
passphrase = p.toCharArray();
} else {
System.out
.println("Usage: java InstallCert [:port] [passphrase]" );
return;
}
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();
}
System.out
.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
String line = reader.readLine().trim();
int k;
try {
k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
} catch (NumberFormatException e) {
System.out.println("KeyStore not changed");
return;
}
X509Certificate cert = chain[k];
String alias = host + "-" + (k + 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);
}
}
}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)）