XAF之Security System

最新推荐文章于 2024-11-09 20:06:05 发布

原创最新推荐文章于 2024-11-09 20:06:05 发布 · 2.2k 阅读

2 ·

CC 4.0 BY-SA版权

文章标签：

#security #authentication #user #database #object #null

dev-express 专栏收录该内容

44 篇文章

订阅专栏

本文介绍了XAF平台的安全系统配置，包括两种内置安全策略：SimpleSecurityStrategy和ComplexSecurityStrategy，以及两种认证方式：Standard Authentication和ActiveDirectoryAuthentication。重点阐述了ComplexSecurityStrategy的实现步骤，涉及角色、用户和权限的创建及分配。

安全系统策略

XAF的安全系统是用静态类SecuritySystem定义的。终端用户使用XAF程序时，安全系统会检查当前用户是否有足够的权限执行某项操作。

XAF提供了两个内置安全策略：

Simple Security Strategy

该策略有两个用户类型：用户(user)和管理员(administrator)。user可以访问除User对象外的所有对象。然而，它可以修改自身的密码和其他安全无关的详情。此外，user可以在只读模式下访问User列表。Administrator可以访问全部的对象，此外还可以编辑Application Model。

Complex Security Strategy

该策略提供了多种用户组，这些组被叫做Role。每个组拥有不同的权限，用户user可以拥有多个Role，即用户的权限可以叠加。user和role的关系是多对多的关系。

XAF的两种认证方式：

Standard Authentication

标准认证。弹出登录窗口，输入用户名和密码登录。

Active Directory Authentication

活动文件夹认证。程序使用WindowsActiveDirectory服务获取用户信息，然后使用该信息验证用户。若在当前系统找到用户和数据库的对象符合，则通过验证。XAF默认使用这种方式验证。

Complex Security Strategy

1.基本概念

五种操作权限：

SecurityOperations.Create

SecurityOperations.Delete

SecurityOperations.Navigation

SecurityOperations.Read

SecurityOperations.Write

这里要说一下的是SecurityOperations.Navigation权限，当针对的是Type时，表示在导航栏和列表可导航，当针对的是object时，在导航栏不可见，但在列表中可导航。

精细的权限控制，三种权限控制级别：

object-level：针对具体的对象，一般需要设置对象筛选；

type-level：针对某种类型，其子类当然也属于该权限范围；

member-level：针对某类型的属性（成员）；

三种权限可以组合，构成复杂的权限。

2.实现步骤

2.1 加入安全Model

将Security Strategy Complex和Authentication Standard拖到 WinApplication.cs中。

以下代码需要加入到MySolution.Module | DatabaseUpdate | Updater.cs的UpdateDatabaseAfterUpdateSchema方法中。另外，其中用到的两个自定义函数如下，他们也位于该文件中：

 private void GrantAllAccess(Type type, ref SecurityRole role)
        {
            role.Permissions.GrantRecursive(type, SecurityOperations.Create);
            role.Permissions.GrantRecursive(type, SecurityOperations.Delete);
            role.Permissions.GrantRecursive(type, SecurityOperations.Navigate);
            role.Permissions.GrantRecursive(type, SecurityOperations.Read);
            role.Permissions.GrantRecursive(type, SecurityOperations.Write);
        }
        private void DenyAllAccess(Type type, ref SecurityRole role)
        {
            role.Permissions.DenyRecursive(type, SecurityOperations.Create);
            role.Permissions.DenyRecursive(type, SecurityOperations.Delete);
            role.Permissions.DenyRecursive(type, SecurityOperations.Navigate);
            role.Permissions.DenyRecursive(type, SecurityOperations.Read);
            role.Permissions.DenyRecursive(type, SecurityOperations.Write);
        }

2.2 创建各Role和User

#region 创建Administrator Role
            // If a role with the Administrators name does not exist in the database, create this role
            SecurityRole adminRole = ObjectSpace.FindObject<SecurityRole>(new BinaryOperator("Name", "Administrators"));
            if (adminRole == null)
            {
                adminRole = ObjectSpace.CreateObject<SecurityRole>();
                adminRole.Name = "Administrators";
            }
            adminRole.BeginUpdate();
            //Give a permission to edit the Application Model
            adminRole.CanEditModel = true;
            //Provide full access to all objects
            GrantAllAccess(typeof(object), ref adminRole);
            adminRole.EndUpdate();
            //Save the Administrators role to the database
            adminRole.Save();
            #endregion
            #region 创建User Role,从Administrator中减少权限
            // If a role with the "Users" name doesn't exist in the database, create this role
            SecurityRole userRole = ObjectSpace.FindObject<SecurityRole>(new BinaryOperator("Name", "Users"));
            if (userRole == null)
            {
                userRole = ObjectSpace.CreateObject<SecurityRole>();
                userRole.Name = "Users";
            }
            userRole.BeginUpdate();
            GrantAllAccess(typeof(object), ref userRole);
            DenyAllAccess(typeof(SecurityUser), ref userRole);
            DenyAllAccess(typeof(SecurityRole), ref userRole);
            DenyAllAccess(typeof(PermissionDescriptorBase), ref userRole);
            DenyAllAccess(typeof(PermissionData), ref userRole);
            DenyAllAccess(typeof(TypePermissionDetails), ref userRole);
            userRole.EndUpdate();
            // Save the "Users" role to the database
            userRole.Save();

            #endregion

            SecurityRole defaultRole = ObjectSpace.FindObject<SecurityRole>(new BinaryOperator("Name", "Default"));
            if (defaultRole == null)
            {
                defaultRole = ObjectSpace.CreateObject<SecurityRole>();
                defaultRole.Name = "Default";
//object-level控制，针对Oid为当前用户id的SecurityUser对象                
//Allow reading and navigating to the SecurityUser object representing the current user
                ObjectOperationPermissionData myDetailsPermission = ObjectSpace.CreateObject<ObjectOperationPermissionData>();
                myDetailsPermission.TargetType = typeof(SecurityUser);
                myDetailsPermission.Criteria = "[Oid] = CurrentUserId()";
                myDetailsPermission.AllowNavigate = true;
                myDetailsPermission.AllowRead = true;
                myDetailsPermission.Save();
                defaultRole.PersistentPermissions.Add(myDetailsPermission);
//Member-level控制，针对SecurityUser的ChangePasswordOnFirstLogon和StoredPassword属性                
//Allow an access to change the ChangePasswordOnFirstLogon and StoredPassword properties of the 
                MemberOperationPermissionData userMembersPermission = ObjectSpace.CreateObject<MemberOperationPermissionData>();
                userMembersPermission.TargetType = typeof(SecurityUser);
                userMembersPermission.Members = "ChangePasswordOnFirstLogon, StoredPassword";
                userMembersPermission.AllowWrite = true;
                userMembersPermission.Save();
                defaultRole.PersistentPermissions.Add(userMembersPermission);
                //Allow reading and navigating to the SecurityRole object representing the current Role
                ObjectOperationPermissionData defaultRolePermission = ObjectSpace.CreateObject<ObjectOperationPermissionData>();
                defaultRolePermission.TargetType = typeof(SecurityRole);
                defaultRolePermission.Criteria = "[Name] = 'Default'";
                defaultRolePermission.AllowNavigate = true;
                defaultRolePermission.AllowRead = true;
                defaultRolePermission.Save();
                defaultRole.PersistentPermissions.Add(defaultRolePermission);
//Type-level控制，针对AuditDataItemPersistent类型               
 //Allow access to the objects of the AuditDataItemPersistent type
                TypeOperationPermissionData auditDataItemPermission = ObjectSpace.CreateObject<TypeOperationPermissionData>();
                auditDataItemPermission.TargetType = typeof(AuditDataItemPersistent);
                auditDataItemPermission.AllowRead = true;
                auditDataItemPermission.AllowWrite = true;
                auditDataItemPermission.AllowCreate = true;
                auditDataItemPermission.Save();
                defaultRole.PersistentPermissions.Add(auditDataItemPermission);
                
                defaultRole.Save();
            }


            SecurityUser user1 = ObjectSpace.FindObject<SecurityUser>(new BinaryOperator("UserName", "Sam"));
            if (user1 == null)
            {
                user1 = ObjectSpace.CreateObject<SecurityUser>();
                user1.UserName = "Sam";
                // Set a password if the standard authentication type is used
                user1.SetPassword("");
            }
            // If a user named 'John' doesn't exist in the database, create this user
            SecurityUser user2 = ObjectSpace.FindObject<SecurityUser>(new BinaryOperator("UserName", "John"));
            if (user2 == null)
            {
                user2 = ObjectSpace.CreateObject<SecurityUser>();
                user2.UserName = "John";
                // Set a password if the standard authentication type is used
                user2.SetPassword("");
            }


            // Add the "Administrators" Role to the user1
            user1.Roles.Add(adminRole);
            // Add the "Users" Role to the user2
            user2.Roles.Add(userRole);
            user2.Roles.Add(defaultRole);
            // Save the users to the database
            user1.Save();
            user2.Save();
            ObjectSpace.CommitChanges();


            SecurityRole anonymousRole = ObjectSpace.FindObject<SecurityRole>(new BinaryOperator("Name", SecurityStrategy.AdministratorRoleName));
            if (anonymousRole == null)
            {
                anonymousRole = ObjectSpace.CreateObject<SecurityRole>();
                anonymousRole.Name = SecurityStrategy.AnonymousUserName;
                anonymousRole.BeginUpdate();
                anonymousRole.Permissions[typeof(SecurityUser)].Grant(SecurityOperations.Read);
                anonymousRole.EndUpdate();
                anonymousRole.Save();
            }
            SecurityUser anonymousUser = ObjectSpace.FindObject<SecurityUser>(new BinaryOperator("UserName", SecurityStrategy.AnonymousUserName));
            if (anonymousUser == null)
            {
                anonymousUser = ObjectSpace.CreateObject<SecurityUser>();
                anonymousUser.UserName = SecurityStrategy.AnonymousUserName;
                anonymousUser.IsActive = true;
                anonymousUser.SetPassword("");
                anonymousUser.Roles.Add(anonymousRole);
                anonymousUser.Save();
            }

另外，也可在运行时创建权限控制策略：