基于.Net的单点登录(SSO)实现解决方案

//产生令牌 
string tokenValue = Guid.NewGuid().ToString().ToUpper(); 
HttpCookie tokenCookie = new HttpCookie("Token"); 
tokenCookie.Values.Add("Value", tokenValue); 
tokenCookie.Domain = "passport.com"; 
Response.AppendCookie(tokenCookie);

/// <summary> 
/// 初始化数据结构 
/// </summary> 
/// <remarks> 
/// ---------------------------------------------------- 
/// | token(令牌) | info(用户凭证) | timeout(过期时间) | 
/// |--------------------------------------------------| 
/// </remarks> 
private static void cacheInit() 
{ 
if (HttpContext.Current.Cache["CERT"] == null) 
{ 
DataTable dt = new DataTable(); 
dt.Columns.Add("token", Type.GetType("System.String")); 
dt.Columns["token"].Unique = true; 
dt.Columns.Add("info", Type.GetType("System.Object")); 
dt.Columns["info"].DefaultValue = null; 
dt.Columns.Add("timeout", Type.GetType("System.DateTime")); 
dt.Columns["timeout"].DefaultValue = DateTime.Now.AddMinutes(double.Parse(System.Configuration.ConfigurationManager.AppSettings["timeout"])); 
DataColumn[] keys = new DataColumn[1]; 
keys[0] = dt.Columns["token"]; 
dt.PrimaryKey = keys; 
//Cache的过期时间为 令牌过期时间*2 
HttpContext.Current.Cache.Insert("CERT", dt, null, DateTime.MaxValue, TimeSpan.FromMinutes(double.Parse(System.Configuration.ConfigurationManager.AppSettings["timeout"]) * 2)); 
} 
}

using System; 
using System.Data; 
using System.Configuration; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
using System.Text.RegularExpressions; 
namespace SSO.SiteA.Class 
{ 
/// <summary> 
/// 授权页面基类 
/// </summary> 
public class AuthBase : System.Web.UI.Page 
{ 
protected override void OnLoad(EventArgs e) 
{ 
if (Session["Token"] != null) 
{ 
//分站凭证存在 
Response.Write("恭喜，分站凭证存在，您被授权访问该页面！"); 
} 
else 
{ 
//令牌验证结果 
if (Request.QueryString["Token"] != null) 
{ 
if (Request.QueryString["Token"] != "$Token$") 
{ 
//持有令牌 
string tokenValue = Request.QueryString["Token"]; 
//调用WebService获取主站凭证 
SSO.SiteA.RefPassport.TokenService tokenService = new SSO.SiteA.RefPassport.TokenService(); 
object o = tokenService.TokenGetCredence(tokenValue); 
if (o != null) 
{ 
//令牌正确 
Session["Token"] = o; 
Response.Write("恭喜，令牌存在，您被授权访问该页面！"); 
} 
else 
{ 
//令牌错误 
Response.Redirect(this.replaceToken()); 
} 
} 
else 
{ 
//未持有令牌 
Response.Redirect(this.replaceToken()); 
} 
} 
//未进行令牌验证，去主站验证 
else 
{ 
Response.Redirect(this.getTokenURL()); 
} 
} 
base.OnLoad(e); 
} 
/// <summary> 
/// 获取带令牌请求的URL 
/// 在当前URL中附加上令牌请求参数 
/// </summary> 
/// <returns></returns> 
private string getTokenURL() 
{ 
string url = Request.Url.AbsoluteUri; 
Regex reg = new Regex(@"^.*\?.+=.+$"); 
if (reg.IsMatch(url)) 
url += "&Token=$Token$"; 
else 
url += "?Token=$Token$"; 
return "http://www.passport.com/gettoken.aspx?BackURL=" + Server.UrlEncode(url); 
} 
/// <summary> 
/// 去掉URL中的令牌 
/// 在当前URL中去掉令牌参数 
/// </summary> 
/// <returns></returns> 
private string replaceToken() 
{ 
string url = Request.Url.AbsoluteUri; 
url = Regex.Replace(url, @"(\?|&)Token=.*", "", RegexOptions.IgnoreCase); 
return "http://www.passport.com/userlogin.aspx?BackURL=" + Server.UrlEncode(url); 
} 
}//end class 
}