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java - 使用 JDBC 领域进行身份验证

转载 作者:行者123 更新时间:2023-11-30 07:42:19 25 4
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在我的 Java EE 应用程序中,我通过 JDBC 领域实现了身份验证/自动化(我第一次应用此解决方案)。

以下代码在成功登录时没有任何问题,问题是当我输入错误的凭据时:它无论如何都会登录,即使它捕获 ServletException (登录失败),这些代码行也永远不会被执行(尝试过 Debug模式):

request.setAttribute("msg", "Error in login");

nextPage = "/errorPage.jsp";

另一个奇怪的事情:无论我传递给什么

getServletContext().getRequestDispatcher(nextPage).forward(request, response);

作为 nextPage(我尝试静态放置“/errorPage.jsp”),它总是转发到index.jsp。

登录.jsp

 @WebServlet("/Login")
public class Login extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public Login() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String username = request.getParameter("username").trim();
String password = request.getParameter("password").trim();
String nextPage = "/index.jsp";

try {
request.login(username, password);
}
catch (ServletException ex) {
request.setAttribute("msg", "Error in login");
nextPage = "/errorPage.jsp";
}

getServletContext().getRequestDispatcher(nextPage).forward(request, response);
}
}

登录.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
request.logout();
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Welcome</title>
</head>
<body>
<h1>Hi! You need to login.</h1>
<form method="POST" action="/MyApp/Login">
Usuario: <input type="text" name="username" /> Password: <input
type="password" name="password" /> <input type="submit"
value="Send" />
</form>
</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>MyApp</display-name>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
<login-config>
<auth-method>FORM</auth-method>
<realm-name>jdbcRealm</realm-name>
<form-login-config>
<form-login-page>/login.jsp</form-login-page>
<form-error-page>/errorPage.jsp</form-error-page>
</form-login-config>
</login-config>
<security-constraint>
<web-resource-collection>
<web-resource-name>Admin stuff</web-resource-name>
<url-pattern>/admin/*</url-pattern>
<http-method>GET</http-method>
<http-method>POST</http-method>
</web-resource-collection>
<auth-constraint>
<role-name>admin</role-name>
</auth-constraint>
<user-data-constraint>
<transport-guarantee>CONFIDENTIAL</transport-guarantee>
</user-data-constraint>
</security-constraint>
<security-constraint>
<web-resource-collection>
<web-resource-name>User stuff</web-resource-name>
<url-pattern>/user/*</url-pattern>
<http-method>GET</http-method>
<http-method>POST</http-method>
</web-resource-collection>
<auth-constraint>
<role-name>user</role-name>
</auth-constraint>
<user-data-constraint>
<transport-guarantee>CONFIDENTIAL</transport-guarantee>
</user-data-constraint>
</security-constraint>
<security-role>
<role-name>admin</role-name>
</security-role>
<security-role>
<role-name>user</role-name>
</security-role>
</web-app>

在此之前,我尝试了容器管理的安全性解决方案(登录的表单操作调用 j_security_check 组件)。

登录工作正常(即使使用错误的凭据),但我遇到了另一个以前没有遇到过的严重问题:在一个用例中,用户可以看到项目正在处理,但它不应该能够看到其他用户的项目。我使用以下 servlet 实现了这一点,但问题是(与其他解决方案一样)它跳过了一些指令(例如,在数据库中查找用户的指令)并且出现异常,重定向到错误页。

public class ViewUserProjects extends HttpServlet {
private static final long serialVersionUID = 1L;

public ViewUserProjects() {
super();
// TODO Auto-generated constructor stub
}

protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
DAO dao = (DAO) getServletContext().getAttribute("bd");

Principal p = request.getUserPrincipal();
String username = p.getName();

try {
User user = dao.getUserByName(name);
request.getSession().setAttribute("user", user);

ArrayList<Project> projects = new ArrayList<Project>();

tareas = ad.getUserProjects(Integer.parseInt(user.getId()));

request.setAttribute("projects", projects);

getServletContext().getRequestDispatcher(
"/user/viewProjects.jsp").forward(request,
response);
} catch (Exception ex) {
request.setAttribute("msg",
"Error");
getServletContext().getRequestDispatcher("/errorPage.jsp").forward(
request, response);
}
}

protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}

}

最佳答案

当使用JDBCRealm时,使用 container-managed security 是更好的做法申请authentication/authorization而不是从您的应用程序代码中处理这个问题(您正在做的事情)

所以我们允许服务器来处理这个问题,这意味着使用form-based authentication (您正在使用的)按照Servlet Specification会是这样的:

首先是表格:

<form action="j_security_check" method="POST">
Username:<input type="text" name="j_username" placeholder="Username" />
Password:<input type="password" name="j_password" placeholder="Password" />
<input type="submit" value="Log In" />
</form>

然后在我们的Deployment Descriptor中我们必须添加一些您似乎已经拥有的配置,但这是另一个示例:

注意我相信您错过了 * <error-page>我们使用 403 的标记错误是 Forbidden resource

<security-constraint>
<display-name>securityConstraint1</display-name>
<web-resource-collection>
<web-resource-name>resources</web-resource-name>
<description />
<url-pattern>/protected/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<role-name>appUser</role-name>
<role-name>appAdmin</role-name>
</auth-constraint>
</security-constraint>

<security-constraint>
<display-name>securityConstraint2</display-name>
<web-resource-collection>
<web-resource-name>resources</web-resource-name>
<description />
<url-pattern>/protected/admni/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<role-name>appAdmin</role-name>
</auth-constraint>
</security-constraint>

<login-config>
<auth-method>FORM</auth-method>
<realm-name>appRealm</realm-name>
<form-login-config>
<form-login-page>/index.xhtml</form-login-page>
<form-error-page>/public/forbidden.xhtml</form-error-page>
</form-login-config>
</login-config>

<security-role>
<role-name>appUser</role-name>
</security-role>

<security-role>
<role-name>appAdmin</role-name>
</security-role>

<error-page>
<error-code>403</error-code>
<location>/public/forbidden.xhtml</location>
</error-page>

我们不能忘记Data Protection (你已经有了):

<user-data-constraint>
<transport-guarantee>CONFIDENTIAL</transport-guarantee>
</user-data-constraint>

所以现在我们需要定义ROLES对于应用程序,这是在应用程序服务器中定义的映射组中完成的,因此首先。 您使用的是哪个应用服务器?

这是一个使用 GlassFish 的示例

我们需要添加 glassfish-web.xmlsun-web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sun-web-app PUBLIC "-//Sun Microsystems, Inc.//DTD GlassFish Application Server 3.0 Servlet 3.0//EN" "http://www.sun.com/software/appserver/dtds/sun-web-app_3_0-0.dtd">
<sun-web-app error-url="">

<security-role-mapping>
<role-name>appUser</role-name>
<group-name>1</group-name>
</security-role-mapping>

<security-role-mapping>
<role-name>appAdmin</role-name>
<group-name>2</group-name>
</security-role-mapping>

<class-loader delegate="true"/>
<jsp-config>
<property name="keepgenerated" value="true">
<description>Keep a copy of the generated servlet class' java code.</description>
</property>
</jsp-config>
</sun-web-app>

因此,角色被映射到 real repository 中存在的实际组名称。 。 (这是直接在您的应用服务器上创建的)。

为了使其正常工作,我们需要创建一个 TABLE在我们的DB为了定义用户组。

Realm这里是在Server Admin Console中创建的.

在 GlassFish 中转到:

配置>>服务器配置>>安全>>领域

这是领域配置的示例。

JDBCRealm

关于java - 使用 JDBC 领域进行身份验证,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34475277/

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