其他系統與domino系統單點登入的實現方式

• 【背景】

隨著企業中業務不斷增多，使用者處理不同的業務則需要頻繁的切換不同的系統進行操作，而使用者則需要記住各個系統的使用者名稱、密碼，頻繁的登入。如果各個系統間能夠進行單點登入，無疑會大大減少使用者重複輸入密碼的困擾。

由於domino系統相對比較封閉，其他系統想相對安全的單點domino系統並非易事。

也許有些人會說通過這樣的方法，通過模擬使用者登入的方式就可以實現：

Names.nsf?login&username=xxx&password=xxx

但是，這樣實現顯然不太安全，一個需要單獨記錄使用者的明文密碼（domino http

我知道兩種實現方式相對安全：DSAPI和模擬LTPAToken。本文介紹一種，通過dominoLTPAToken的生成方式實現單點登入的方法。

• 【實現原理】

輸入引數

1. 使用者名稱；

2. 登入系統時間；

3. 登入到期時間；

4. Domino金鑰

輸出引數

加密後的LTPAToken加密串

建立cookie

document.cookie= "LtpaToken="+ token + ";expires=" + exp.toGMTString() +";path=/;domain=.xxx.com";

token：加密token

expires：cookie到期時間

domain：單點域名，與dominoSSO配置文件相同，格式：.xxx.com

• 【參考程式碼】

• java程式碼

  import java.io.PrintWriter;
  import java.util.Date;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  
  import lotus.domino.*;
  
  public class JavaAgent extends AgentBase {
  
      public void NotesMain() {
      	Session session = null;
      	AgentContext agentContext = null;
      	Document doc = null;
      	PrintWriter pw = null;
      	String token = "";
      	String sReturn = "false";
      	String sJson = "";
        try {
      	  pw = getAgentOutput();
            session = getSession();
            agentContext = session.getAgentContext();
            doc = agentContext.getDocumentContext();
            String sPara = doc.getItemValueString("query_string_decoded");
            // 單點使用者名稱loginName
            String canonicalUser = sPara.substring(sPara.indexOf("sPara=")+6);
  
            // 單點起始時間
            Date tokenCreation = new Date(new Date().getTime() - 60000 * 10);
  		  String timeLimit="720";
  		  // 單點到期時間
  		  Date tokenExpires = new Date(tokenCreation.getTime() + Long.parseLong(timeLimit) * 60000);
  		  // domino SSO 金鑰（domino SSO配置文件的LTPA_DominoSecret域值）
  		  String dominoSecret = "9BY2oinn1FmI42i3oNEnL3nNVPQ=";
  		  token = LtpaToken.generate(canonicalUser, tokenCreation, tokenExpires, dominoSecret).getLtpaToken();
  		  //System.out.println("token==ssobak==="+token);
  		  sReturn = "true";          
  		  DominoTokenParser tokenParser = new DominoTokenParser();		   
  		  System.out.println("使用者名稱:"+tokenParser.parse(token,dominoSecret));
  		  
        } catch(Exception e) {
            e.printStackTrace();
         }finally{
      	   pw.println("Content-type: text/plain;charset=GB2312");
      	   sJson = "{\"oResult\":\""+sReturn+"\",\"token\":\""+token+"\"}";
      	   System.out.println("sJson="+sJson);
      	   pw.println(sJson);
      	   
      	   //回收domino物件
      	   fnRecycle(doc);
      	   fnRecycle(agentContext);
      	   fnRecycle(session);
      	   
      	   if(pw!=null){
  				pw.close();
  			}
         }
     }  
      
      public void fnRecycle(Base object){
      	if(object != null){
   		   try {
   			  object.recycle();
  			} catch (NotesException e) {
  				// TODO 自動生成 catch 塊
  				e.printStackTrace();
  			}
   	   }
      }
  } 
   
  

  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  import java.util.Calendar;
  import java.util.Date;
  import java.util.Properties;
  
   /** 
       * Lightweight Third Party Authentication. Generates and validates ltpa tokens used in Domino single sign on 
       * environments. Does not work with WebSphere SSO tokens. You need a properties file named LtpaToken.properties which 
       * holds two properties. 
       * 
       * <pre> 
       * ) domino.secret=The base64 encoded secret found in the field LTPA_DominoSecret in the SSO configuration document. 
       * ) cookie.domain=The domain you want generated cookies to be from. e.g. '.domain.com' (Note the leading dot) 
       *</pre> 
       * 
       * @author $Author: rkelly $ 
       * @version $Revision: 1.1 $ 
       * @created $Date: 2003/04/07 18:22:14 $ 
       */ 
  public final class LtpaToken { 
          private byte[] creation; 
          private Date creationDate; 
          private byte[] digest; 
          private byte[] expires; 
          private Date expiresDate; 
          private byte[] hash; 
          private byte[] header; 
          private String ltpaToken; 
          private Properties properties = null; 
          private byte[] rawToken; 
          private byte[] user; 
        
          
        
  
              /** 
           * Constructor for the LtpaToken object 
           * 
           * @param token 
           *            Description of the Parameter 
           */ 
          public LtpaToken(String token) { 
              init(); 
              ltpaToken = token; 
              rawToken = Base64.decode(token); 
              user = new byte[(rawToken.length) - 40]; 
              for (int i = 0; i < 4; i++) { 
                  header[i] = rawToken[i]; 
              } 
              for (int i = 4; i < 12; i++) { 
                  creation[i - 4] = rawToken[i]; 
              } 
              for (int i = 12; i < 20; i++) { 
                  expires[i - 12] = rawToken[i]; 
              } 
              for (int i = 20; i < (rawToken.length - 20); i++) { 
                  user[i - 20] = rawToken[i]; 
              } 
              for (int i = (rawToken.length - 20); i < rawToken.length; i++) { 
                  digest[i - (rawToken.length - 20)] = rawToken[i]; 
              } 
              creationDate = new Date(Long.parseLong(new String(creation), 16) * 1000); 
              expiresDate = new Date(Long.parseLong(new String(expires), 16) * 1000); 
          } 
  
          /** 
           * Constructor for the LtpaToken object 
           */ 
          private LtpaToken() { 
              init(); 
          } 
  
  
  
          /** 
           * Gets the creationDate attribute of the LtpaToken object 
           * 
           * @return The creationDate value 
           */ 
          public Date getCreationDate() { 
              return creationDate; 
          } 
  
          /** 
           * Gets the expiresDate attribute of the LtpaToken object 
           * 
           * @return The expiresDate value 
           */ 
          public Date getExpiresDate() { 
              return expiresDate; 
          } 
  
          /** 
           * Gets the user attribute of the LtpaToken object 
           * 
           * @return The user value 
           */ 
          public String getCanonicalUser() { 
              return new String(user); 
          } 
          
          public String getUser(String prefix, String suffix) {
          	String userName = new String(user);
          	if (prefix !=null && !prefix.equals("")) {
      			userName = userName.substring(userName.indexOf(prefix) + prefix.length());
      		}
      		if (suffix ==null || suffix.equals("")) {
      			suffix = "/";
      		} 
          	return userName.substring(0, userName.indexOf("/"));
          }
          
          public String getUser() { 
              return new String(user); 
          } 
  
  
          /** 
           * Validates the SHA-1 digest of the token with the Domino secret key. 
           * 
           * @return Returns true if valid. 
           */ 
          public  boolean isValid(LtpaTokenConfig config) { 
              boolean validDigest = false; 
              boolean validDateRange = false; 
              byte[] newDigest; 
              byte[] bytes = null; 
              Date now = new Date(); 
  
              MessageDigest md = getDigest(); 
  
              bytes = concatenate(bytes, header); 
  
              bytes = concatenate(bytes, creation); 
  
              bytes = concatenate(bytes, expires); 
  
              bytes = concatenate(bytes, user); 
  
              bytes = concatenate(bytes, Base64.decode(config.getDominoSecret())); 
  
              newDigest = md.digest(bytes); 
  
              validDigest = MessageDigest.isEqual(digest, newDigest); 
              
              validDateRange = now.after(creationDate) && now.before(expiresDate); 
  
              return validDigest & validDateRange; 
          } 
  
          /** 
           * String representation of LtpaToken object. 
           * 
           * @return Returns token String suitable for cookie value. 
           */ 
          public String toString() { 
              return ltpaToken; 
          } 
  
          /** 
           * Creates a new SHA-1 <code>MessageDigest</code> instance. 
           * 
           * @return The instance. 
           */ 
          private MessageDigest getDigest() { 
              try { 
                  return MessageDigest.getInstance("SHA-1");            
              } catch (NoSuchAlgorithmException nsae) { 
                  nsae.printStackTrace(); 
              } 
              return null; 
          } 
  
          /** 
           * Description of the Method 
           */ 
          private void init() { 
  
              creation = new byte[8]; 
              digest = new byte[20]; 
              expires = new byte[8]; 
              hash = new byte[20]; 
              header = new byte[4]; 
  
          } 
  
          /** 
           * Validates the SHA-1 digest of the token with the Domino secret key. 
           * 
           * @param ltpaToken 
           *            Description of the Parameter 
           * @return The valid value 
           */ 
          public static boolean isValid(String ltpaToken,LtpaTokenConfig config) { 
              LtpaToken ltpa = new LtpaToken(ltpaToken); 
              return ltpa.isValid(config); 
          } 
  
          /** 
           * Generates a new LtpaToken with given parameters. 
           * 
           * @param canonicalUser 
           *            User name in canonical form. e.g. 'CN=Robert Kelly/OU=MIS/O=EBIMED'. 
           * @param tokenCreation 
           *            Token creation date. 
           * @param tokenExpires 
           *            Token expiration date. 
           * @return The generated token. 
           */ 
          public static LtpaToken generate(String canonicalUser, Date tokenCreation, Date tokenExpires,String  secret) { 
              LtpaToken ltpa = new LtpaToken(); 
              System.out.println("Generating token for " + canonicalUser); 
              Calendar calendar = Calendar.getInstance(); 
              MessageDigest md = ltpa.getDigest(); 
              ltpa.header = new byte[] { 0, 1, 2, 3 }; 
              byte[] token = null; 
              calendar.setTime(tokenCreation); 
              ltpa.creation = Long.toHexString(calendar.getTimeInMillis() / 1000).toUpperCase().getBytes(); 
              calendar.setTime(tokenExpires); 
              ltpa.expires = Long.toHexString(calendar.getTimeInMillis() / 1000).toUpperCase().getBytes();  
              //try {
  			//	canonicalUser = new String(canonicalUser.getBytes(), "GB2312");
  			//} catch (UnsupportedEncodingException e) {
  				// TODO 自動生成 catch 塊
  			//	e.printStackTrace();
  			//}
              ltpa.user = canonicalUser.getBytes(); 
              //ltpa.user = canonicalUser.getBytes(Charset.forName("GB18030")); 
  
              token = concatenate(token, ltpa.header); 
              token = concatenate(token, ltpa.creation); 
              token = concatenate(token, ltpa.expires); 
              token = concatenate(token, ltpa.user); 
              md.update(token); 
              ltpa.digest = md.digest(Base64.decode(secret)); 
              token = concatenate(token, ltpa.digest); 
  
              return new LtpaToken(new String(Base64.encodeBytes(token,Base64.DONT_BREAK_LINES)));            
          } 
  
          /** 
           * Helper method to concatenate a byte array. 
           * 
           * @param a 
           *            Byte array a. 
           * @param b 
           *            Byte array b. 
           * @return a + b. 
           */ 
          private static byte[] concatenate(byte[] a, byte[] b) { 
              if (a == null) { 
                  return b; 
              } else { 
                  byte[] bytes = new byte[a.length + b.length]; 
  
                  System.arraycopy(a, 0, bytes, 0, a.length); 
                  System.arraycopy(b, 0, bytes, a.length, b.length); 
                  return bytes; 
              } 
          } 
  
          public String getLtpaToken() { 
              return ltpaToken; 
          } 
  
          public void setLtpaToken(String ltpaToken) { 
              this.ltpaToken = ltpaToken; 
          } 
      }

  
  
  

• js程式碼

  function fnSSO(){
  	if(document.getElementById("username").value==""){
  		alert("請輸入登入名！");
  		document.getElementById("username").focus();
  		return false;
  	}
  	var objHTTP= new ActiveXObject("Microsoft.XMLHTTP");
  	var sDbPath = document.getElementById("DbFilePath").value;
  	var sPara = document.getElementById("username").value;
  	var vurl = "/"+sDbPath+"/"+"ajaxSSO" + "?openagent&sPara=" + sPara;
  	objHTTP.open("GET", vurl, false, "", "");
  	objHTTP.setRequestHeader("If-Modified-Since","0");
  	objHTTP.send(false);
  	var getOptions = objHTTP.responseText;
  	getOptions = getOptions.replace(/\n/ig,"");
  	var oOptions = eval("(" + getOptions + ")");
  	var sReturn = "";
  	if(oOptions && oOptions.oResult=="true"){
  		var Days = 30; 
  		var exp = new Date(); 
  		exp.setTime(exp.getTime() + Days*24*60*60*1000);
  		var token = oOptions.token;
  		if(token!=""){
  			// 建立單點cookie
  			document.cookie = "LtpaToken="+ token + ";expires=" + exp.toGMTString() + ";path=/;domain=.xxx.com";
  		}
  		sReturn = sPara + "：單點登入成功！"
  	}else{
  		sReturn = sPara + "：單點失敗！"
  	}
  	
  	document.getElementById("ssoinfo").innerHTML = "<font color='red'>" + sReturn + "</font>";
  	// 頁面跳轉
  	location.href = "http://xxx.com/xxx.nsf/xxx?openform";
  }

• 【實現效果】