http://www.cnblogs.com/bomo/p/3309766.html
【MVC】ASP.NET MVC Forms验证机制
ASP.NET MVC 3
使用Forms身份验证
身份验证流程
一、用户登录
1、验证表单:ModelState.IsValid
2、验证用户名和密码:通过查询数据库验证
3、如果用户名和密码正确,则在客户端保存Cookie以保存用户登录状态:SetAuthCookie
1):从数据库中查出用户名和一些必要的信息,并把额外信息保存到UserData中
2):把用户名和UserData保存到 FormsAuthenticationTicket 票据中
3):对票据进行加密 Encrypt
4):将加密后的票据保存到Cookie发送到客户端
4、跳转到登录前的页面
二、验证登录
1、在Global中注册PostAuthenticateRequest事件函数,用于解析客户端发过来的Cookie数据
1):通过 HttpContext.Current.User.Identity 判断用户是否登录(FormsIdentity,IsAuthenticated,AuthenticationType)
2):从HttpContext 的Request的Cookie中解析出Value,解密得到 FormsAuthenticationTicket 得到UserData
2、角色验证
在Action加入 Authorize特性,可以进行角色验证
在 HttpContext.Current.User 的 IsInRole 方法进行角色认证(需要重写)
下面是代码,以上用到的所有验证的类都进行重载
一、首先是用户用户身份认证的 IPrincipal
这里抽象出通用属性,定义两个 IPrincipal
//通用的用户实体
public class MyFormsPrincipal<TUserData> : IPrincipal
where TUserData : class, new()
{
//当前用户实例
public IIdentity Identity { get; private set; }
//用户数据
public TUserData UserData { get; private set; }
public MyFormsPrincipal(FormsAuthenticationTicket ticket, TUserData userData)
{
if (ticket == null)
throw new ArgumentNullException("ticket");
if (userData == null)
throw new ArgumentNullException("userData");
Identity = new FormsIdentity(ticket);
UserData = userData;
}
//角色验证
public bool IsInRole(string role)
{
var userData = UserData as MyUserDataPrincipal;
if (userData == null)
throw new NotImplementedException();
return userData.IsInRole(role);
}
//用户名验证
public bool IsInUser(string user)
{
var userData = UserData as MyUserDataPrincipal;
if (userData == null)
throw new NotImplementedException();
return userData.IsInUser(user);
}
}
通用实体里面可以存放数据实体,并且把角色验证和用户验证放到了具体的数据实体里面
//存放数据的用户实体
public class MyUserDataPrincipal : IPrincipal
{
//数据源
private readonly MingshiEntities mingshiDb = new MingshiEntities();
public int UserId { get; set; }
//这里可以定义其他一些属性
public List<int> RoleId { get; set; }
//当使用Authorize特性时,会调用改方法验证角色
public bool IsInRole(string role)
{
//找出用户所有所属角色
var userroles = mingshiDb.UserRole.Where(u => u.UserId == UserId).Select(u => u.Role.RoleName).ToList();
var roles = role.Split(new[] {','}, StringSplitOptions.RemoveEmptyEntries);
return (from s in roles from userrole in userroles where s.Equals(userrole) select s).Any();
}
//验证用户信息
public bool IsInUser(string user)
{
//找出用户所有所属角色
var users = user.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
return mingshiDb.User.Any(u => users.Contains(u.UserName));
}
[ScriptIgnore] //在序列化的时候忽略该属性
public IIdentity Identity { get { throw new NotImplementedException(); } }
}
二、用于验证和设置Cookie的 FormsAuthentication
//身份验证类
public class MyFormsAuthentication<TUserData> where TUserData : class, new()
{
//Cookie保存是时间
private const int CookieSaveDays = 14;
//用户登录成功时设置Cookie
public static void SetAuthCookie(string username, TUserData userData, bool rememberMe)
{
if (userData == null)
throw new ArgumentNullException("userData");
var data = (new JavaScriptSerializer()).Serialize(userData);
//创建ticket
var ticket = new FormsAuthenticationTicket(
2, username, DateTime.Now, DateTime.Now.AddDays(CookieSaveDays), rememberMe, data);
//加密ticket
var cookieValue = FormsAuthentication.Encrypt(ticket);
//创建Cookie
var cookie = new HttpCookie(FormsAuthentication.FormsCookieName, cookieValue)
{
HttpOnly = true,
Secure = FormsAuthentication.RequireSSL,
Domain = FormsAuthentication.CookieDomain,
Path = FormsAuthentication.FormsCookiePath,
};
if (rememberMe)
cookie.Expires = DateTime.Now.AddDays(CookieSaveDays);
//写入Cookie
HttpContext.Current.Response.Cookies.Remove(cookie.Name);
HttpContext.Current.Response.Cookies.Add(cookie);
}
//从Request中解析出Ticket,UserData
public static MyFormsPrincipal<TUserData> TryParsePrincipal(HttpRequest request)
{
if (request == null)
throw new ArgumentNullException("request");
// 1. 读登录Cookie
var cookie = request.Cookies[FormsAuthentication.FormsCookieName];
if (cookie == null || string.IsNullOrEmpty(cookie.Value)) return null;
try
{
// 2. 解密Cookie值,获取FormsAuthenticationTicket对象
var ticket = FormsAuthentication.Decrypt(cookie.Value);
if (ticket != null && !string.IsNullOrEmpty(ticket.UserData))
{
var userData = (new JavaScriptSerializer()).Deserialize<TUserData>(ticket.UserData);
if (userData != null)
{
return new MyFormsPrincipal<TUserData>(ticket, userData);
}
}
return null;
}
catch
{
/* 有异常也不要抛出,防止攻击者试探。 */
return null;
}
}
}
三、用于验证角色和用户名的Authorize特性
//验证角色和用户名的类
public class MyAuthorizeAttribute : AuthorizeAttribute
{
protected override bool AuthorizeCore(System.Web.HttpContextBase httpContext)
{
var user = httpContext.User as MyFormsPrincipal<MyUserDataPrincipal>;
if (user != null)
return (user.IsInRole(Roles) || user.IsInUser(Users));
return false;
}
protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
{
//验证不通过,直接跳转到相应页面,注意:如果不使用以下跳转,则会继续执行Action方法
filterContext.Result = new RedirectResult("http://www.baidu.com");
}
}
好了,四个类定义完成,接下来是使用
1、首先是登陆
[HttpPost]
public ActionResult LogOn(LogOnModel model, string returnUrl)
{
if (ModelState.IsValid)
{
//通过数据库查询验证
var bll= new UserBll();
var userId = bll.Validate(model.UserName, model.Password, HttpContext.Request.UserHostAddress, HttpContext.Request.UserAgent);
if (userId > 0)
{
//验证成功,用户名密码正确,构造用户数据(可以添加更多数据,这里只保存用户Id)
var userData = new MyUserDataPrincipal {UserId = userId};
//保存Cookie
MyFormsAuthentication<MyUserDataPrincipal>.SetAuthCookie(model.UserName, userData, model.RememberMe);
if (Url.IsLocalUrl(returnUrl) && returnUrl.Length > 1 && returnUrl.StartsWith("/")
&& !returnUrl.StartsWith("//") && !returnUrl.StartsWith("/\\"))
{
return Redirect(returnUrl);
}
else
{
return RedirectToAction("Index", "Home");
}
}
else
{
ModelState.AddModelError("", "提供的用户名或密码不正确。");
}
}
// 如果我们进行到这一步时某个地方出错,则重新显示表单
return View(model);
}
二、登陆完成后,是验证,验证之前首先要获得客户端的用户数据(从之前设置的Cookie中解析)
在全局文件:Global.asax 中添加下面代码
protected void Application_PostAuthenticateRequest(object sender, System.EventArgs e)
{
var formsIdentity = HttpContext.Current.User.Identity as FormsIdentity;
if (formsIdentity != null && formsIdentity.IsAuthenticated && formsIdentity.AuthenticationType == "Forms")
{
HttpContext.Current.User =
MyFormsAuthentication<MyUserDataPrincipal>.TryParsePrincipal(HttpContext.Current.Request);
}
}
这样就从Request解析出了UserData,下面可以用于验证了
三、在需要验证角色的Action上添加 [MyAuthorize] 特性
[MyAuthorize(Roles = "User", Users = "bomo,toroto")]
public ActionResult About()
{
return View();
}
当用户访问该Action时,调用 MyAuthorize 的 AuthorizeCore 方法进行验证, 如果验证成功,则继续执行,如果验证失败,会调用 HandleUnauthorizedRequest方法做相应处理,在MyAuthorize 中可以获得这里定义的 Roles 和 Users 进行验证