使用HttpMoudle和IPrincipal实现自定义身份及权限认证

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HttpContext.Current.User用户对象表示用户的安全上下文，代码当前即以该用户的名义运行，包括用户的标识（IIdentity）和它们所属的任何角色。所有用户对象都需要实现 IPrincipal 接口。(MSDN) 创建一个User类实现IIdentity接口重写相应的方法

public class User : IIdentity { private int _id; private string _userName; private string _password; private bool _isAuthenticated; #region properties public virtual int Id { get { return this._id; } set { this._id = value; } } public virtual string UserName { get { return this._userName; } set { this._userName = value; } } public virtual string Password { get { return this._password; } set { this._password = value; } } //是否通过认证 public virtual bool IsAuthenticated { get { return this._isAuthenticated; } set { this._isAuthenticated = value; } } //重写为用户ID public virtual string Name { get { if (this._isAuthenticated) return this._id.ToString(); else return ""; } } public virtual string AuthenticationType { get { return "CuyahogaAuthentication"; } } public User() { this._id = -1; this._isAuthenticated = false; } }

创建一个CuyahogaPrincipal类实现IPrincipal接口

public class CuyahogaPrincipal : IPrincipal { private User _user; // 返回一个现实IIdentity接口的user对象 public IIdentity Identity { get { return this._user; } } // 当前用户是否属于指定角色在以后的权限认证中可以使用也可以使用User类中的相关方法来代替 public bool IsInRole(string role) { foreach (Role roleObject in this._user.Roles) { if (roleObject.Name.Equals(role)) return true; } return false; } ///初始化若user通过授权则创建 public CuyahogaPrincipal(User user) { if (user != null && user.IsAuthenticated) { this._user = user; } else { throw new SecurityException("Cannot create a principal without u valid user"); } } }

创建一个实现IHttpModule的AuthenticationModule类

public class AuthenticationModule : IHttpModule { private const int AUTHENTICATION_TIMEOUT = 20; public AuthenticationModule() { } public void Init(HttpApplication context) { context.AuthenticateRequest += new EventHandler(Context_AuthenticateRequest); } public void Dispose() { // Nothing here } //登录时验证用户时使用 public bool AuthenticateUser(string username, string password, bool persistLogin) { //数据访问类 CoreRepository cr = (CoreRepository)HttpContext.Current.Items["CoreRepository"]; string hashedPassword = Encryption.StringToMD5Hash(password); try { //通过用户名密码得到用户对象 User user = cr.GetUserByUsernameAndPassword(username, hashedPassword); if (user != null) { user.IsAuthenticated = true; //string currentIp = HttpContext.Current.Request.UserHostAddress; //user.LastLogin = DateTime.Now; //user.LastIp = currentIp; // Save login date and IP 记录相关信息 cr.UpdateObject(user);更新用户授权通过信息 // Create the authentication ticket HttpContext.Current.User = new CuyahogaPrincipal(user); //通过授权 FormsAuthentication.SetAuthCookie(user.Name, persistLogin); return true; } else { //log.Warn(String.Format("Invalid username-password combination: {0}:{1}.", username, password)); return false; } } catch (Exception ex) { throw new Exception(String.Format("Unable to log in user '{0}': " + ex.Message, username), ex); } } /// <summary> /// Log out the current user.注销用户 /// </summary> public void Logout() { if (HttpContext.Current.User != null && HttpContext.Current.User.Identity.IsAuthenticated) { FormsAuthentication.SignOut(); } } private void Context_AuthenticateRequest(object sender, EventArgs e) { HttpApplication app = (HttpApplication)sender; if (app.Context.User != null && app.Context.User.Identity.IsAuthenticated)//若用户已经通过认证 { CoreRepository cr = (CoreRepository)HttpContext.Current.Items["CoreRepository"]; int userId = Int32.Parse(app.Context.User.Identity.Name); User cuyahogaUser = (User)cr.GetObjectById(typeof(User), userId);//得到对应的cuyahogaUser对象 cuyahogaUser.IsAuthenticated = true; app.Context.User = new CuyahogaPrincipal(cuyahogaUser);//将通过标准窗体认证的user替换成CuyahogaUser, cuyahogaUser包含更多的信息 } } }

登录时

protected void btnLogin_Click(object sender, System.EventArgs e) { AuthenticationModule am = (AuthenticationModule)Context.ApplicationInstance.Modules["AuthenticationModule"]; if (this.txtUsername.Text.Trim().Length > 0 && this.txtPassword.Text.Trim().Length > 0) { try { if (am.AuthenticateUser(this.txtUsername.Text, this.txtPassword.Text, this.chkPersistLogin.Checked)) { //通过认证 Context.Response.Redirect(Context.Request.RawUrl); } else { //认证失败 } } catch (Exception ex) { } } }

退出登录用

protected void btnLogout_Click(object sender, System.EventArgs e) { AuthenticationModule am = (AuthenticationModule)Context.ApplicationInstance.Modules["AuthenticationModule"]; am.Logout(); Context.Response.Redirect(Context.Request.RawUrl); }

这样就实现了身份认证功能然后可以方便的实现权限认证在User类中实现相应的权限逻辑如: 表示当前用户是否有权限浏览指定的节点

public bool CanView(Node node) { foreach (Permission p in node.NodePermissions) { if (p.ViewAllowed && IsInRole(p.Role)) { return true; } } return false; }

在Page代码中嵌入验证代码即可

User CuyahogaUser = this.User.Identity as User; if(CuyahogaUser.CanView()) { }

权限认证模块还是挺简单. 别忘了在web.config中对AuthenticationModule进行注册分析代码来自Cuyahoga

http://www.cnblogs.com/jecray/archive/2007/08/31/CustomAuthenticationModule.html