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【Tech】CAS多机部署Server和Java Client端
昨天尝试把cas的java client端部署到另外一台机器，结果就有问题了。（localhost部署cas server和java client端参见：http://www.cnblogs.com/sunshineatnoon/p/4119565.html）
主要是client访问的时候报错：javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: No subject alternative names present。
后来在stackoverflow上找到了解决办法：http://stackoverflow.com/questions/9331087/how-to-setup-ssl-for-cas-and-client-different-machines?rq=1
根据jasig文档对这个错误的解释：
Sample Alt Name Stack Tracejavax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: No subject alternative names present
In most cases this is a hostname/SSL certificate CN mismatch. This commonly happens when a self-signed certificate issued to localhost is placed on a machine that is accessed by IP address. It should be noted that generating a certificate with an IP address for a common name, e.g. CN=192.168.1.1,OU=Middleware,dc=vt,dc=edu, will not work in most cases where the client making the connection is Java. For example the Java CAS client will throw SSL errors on connecting to a CAS server secured with a certificate containing an IP address in the CN.是由于生成的证书中域名（CN）和server的域名或者以后client端访问的域名不一致造成的，并且这里也说了，不能用ip地址当作生成证书时候的CN，只能用域名。
所以改变的方法就是用域名生成证书，并且配置client端电脑的hosts和lmhosts.sam文件解析服务器域名，具体步骤如下：
1. 编辑client端机器的C:\Windows\System32\Drivers\etc\hosts，添加一行：
your_ip(xxx.xxx.xxx.xxx) your_cn(sunshineatnoon.com)
2. 编辑client端机器的C:\Windows\System32\Drivers\etc\lmhosts.sam，添加一行：
your_ip(xxx.xxx.xxx.xxx) your_cn(sunshineatnoon.com)
3. 在server端所在的机器用keytool重新生成证书：
keytool -genkeypair -alias "tomcat" -keyalg "RSA" -keystore "g:\tomcat.keystore"
在回答"what‘s you name?"这个问题的时候回答上述你的域名：sunshineatnoon.com
4.配置server端机器的tomcat下%TOMCAT_PATH%/conf下的server.xml文件，参考http://www.cnblogs.com/sunshineatnoon/p/4064632.html的3(1)(2)，如果生成证书和以前的位置密码都没变，就不用重新配置了。
5.重新用文件InstallCert.java生成证书放到client端机器的$JAVA_HOME\jre\lib\security下，参考http://www.cnblogs.com/sunshineatnoon/p/4070750.html我所解决的第2个bug。
6.client端的java程序中请求ticket的url就由https://localhost:8443/cas/v1/tickets变成了https://sunshineatnoon.com:8443/cas/v1/tickets，改变后的client.java如下所示：
1 package cas; 2 3 4 import java.io.BufferedReader; 5 import java.io.BufferedWriter; 6 import java.io.IOException; 7 import java.io.InputStreamReader; 8 import java.io.OutputStreamWriter; 9 import java.net.MalformedURLException; 10 import java.net.URL; 11 import java.net.URLConnection; 12 import java.net.URLEncoder; 13 14 import javax.net.ssl.HttpsURLConnection; 15 16 public class Client { 17 18 19 public static void main(String... args) throws Exception 20 { 21 String username ="test01"; 22 String password ="psw01"; 23 validateFromCAS(username,password); 24 } 25 26 public static boolean validateFromCAS(String username, String password) throws Exception 27 { 28 29 //String url = "https://localhost:8443/cas/v1/tickets"; 30 String url = "https://sunshineatnoon.com:8443/cas/v1/tickets"; 31 try 32 { 33 HttpsURLConnection hsu = (HttpsURLConnection)openConn(url); 34 String s = URLEncoder.encode("username","UTF-8") + "=" + URLEncoder.encode("test01","UTF-8"); 35 s+="&" +URLEncoder.encode("password","UTF-8") + "=" + URLEncoder.encode("psw01","UTF-8"); 36 37 System.out.println(s); 38 OutputStreamWriter out = new OutputStreamWriter(hsu.getOutputStream()); 39 BufferedWriter bwr = new BufferedWriter(out); 40 bwr.write(s); 41 bwr.flush(); 42 bwr.close(); 43 out.close(); 44 45 String tgt = hsu.getHeaderField("location"); 46 System.out.println( hsu.getResponseCode()); 47 if(tgt != null && hsu.getResponseCode() == 201) 48 { 49 System.out.println(tgt); 50 51 System.out.println("Tgt is : " + tgt.substring( tgt.lastIndexOf("/") +1)); 52 tgt = tgt.substring( tgt.lastIndexOf("/") +1); 53 bwr.close(); 54 closeConn(hsu); 55 56 57 //String serviceURL = "http://localhost:8080/CasClient"; 58 String serviceURL = "http://www.baidu.com"; 59 String encodedServiceURL = URLEncoder.encode("service","utf-8") +"=" + URLEncoder.encode(serviceURL,"utf-8"); 60 System.out.println("Service url is : " + encodedServiceURL); 61 62 63 64 String myURL = url+ "/"+ tgt ; 65 System.out.println(myURL); 66 hsu = (HttpsURLConnection)openConn(myURL); 67 out = new OutputStreamWriter(hsu.getOutputStream()); 68 bwr = new BufferedWriter(out); 69 bwr.write(encodedServiceURL); 70 bwr.flush(); 71 bwr.close(); 72 out.close(); 73 74 System.out.println("Response code is: " + hsu.getResponseCode()); 75 76 BufferedReader isr = new BufferedReader( new InputStreamReader(hsu.getInputStream())); 77 String line; 78 System.out.println( hsu.getResponseCode()); 79 while ((line = isr.readLine()) != null) { 80 System.out.println( line); 81 } 82 isr.close(); 83 hsu.disconnect(); 84 return true; 85 86 } 87 else 88 { 89 return false; 90 } 91 92 93 } 94 catch(MalformedURLException mue) 95 { 96 mue.printStackTrace(); 97 throw mue; 98 99 }100 catch(IOException ioe)101 {102 ioe.printStackTrace();103 throw ioe;104 }105 106 107 108 109 110 }111 112 113 static URLConnection openConn(String urlk) throws MalformedURLException, IOException114 {115 116 URL url = new URL(urlk);117 HttpsURLConnection hsu = (HttpsURLConnection) url.openConnection();118 hsu.setDoInput(true);119 hsu.setDoOutput(true);120 hsu.setRequestMethod("POST");121 return hsu;122 123 124 }125 126 127 static void closeConn(HttpsURLConnection c)128 {129 c.disconnect();130 }131 132 133 }
注意红色那行改变的代码。
7.这时client端上的java client端应该就可以成功得到TGT和ST了。
【Tech】CAS多机部署Server和Java Client端