v3rity技术文章集

 v3rity是由David Litchfield在2010年3月 建立起来的组织,旨在解决一些IT问题。官方网站提供了一些比较有用的文章。

Papers on Oracle Forensics
Oracle Forensics Part 7: Using the Oracle System Change Number in Forensic Investigations
Oracle Forensics Part 6: Examining Undo Segments, Flashback and the Oracle Recycle Bin
Oracle Forensics Part 5: Finding Evidence in the Absence of Auditing
Oracle Forensics Part 4: Live Response
Oracle Forensics Part 3: Isolating Evidence of Attacks Against the Authentication Mechanism
Oracle Forensics Part 2: Locating Dropped Objects
Oracle Forensics Part 1: Dissecting the Redo Logs

Papers on Database Security
Hacking Aurora in Oracle 11g
Exploiting PL/SQL Injection With Only CREATE SESSION Privileges in Oracle 11g 
Understanding Database Security
Exploiting PL/SQL Injection Flaws with only CREATE SESSION Privileges
Bypassing DBMS_ASSERT (in certain situations)
Lateral SQL Injection – A New Class of Vulnerability in Oracle.
Cursor Injection – A New Method for Exploiting PL/SQL Injection and Potential Defences
Cursor Snarfing – A New Class of Attack in Oracle
Oracle PL/SQL Injection (Blackhat Japan)
Threat Profiling Microsoft SQL Server
Hack Proofing Oracle Application Server
Microsoft SQL Server Passwords
Data-mining with SQL Injection and Inference
Database Servers on Windows XP and the Unintended Consequences of Simple File Sharing
Web Application Disassembly with ODBC Error Messages
Hackproofing Lotus Domino Web Server

Papers on Buffer Overflows
An Introduction to Heap overflows on AIX 5.3L
Buffer Underruns, DEP, ASLR and Improving the Exploitation Prevention Mechanisms (XPMs) on the Windows Platform
Defeating the Stack Based Buffer Overflow Prevention Mechanism of Microsoft Windows 2003 Server
Variations in Exploit methods between Linux and Windows
Non-stack Based Exploitation of Buffer Overrun Vulnerabilities on Windows NT/2000/XP
Windows Heap Overflows
Windows 2000 Format String Vulnerabilities
Buffer Overflows on SPARC Architecture
Buffer Overflows for Beginners
Exploiting Windows NT 4.0 Buffer Overruns (A Case Study: RASMAN.EXE)











本文转hackfreer51CTO博客,原文链接:http://blog.51cto.com/pnig0s1992/573371,如需转载请自行联系原作者

<think>嗯,用户遇到了一个无法解析符号&#39;jwtAccessDeniedHandler&#39;的问题。我需要先仔细看一下他们提供的代码。首先,用户提供的代码是一个Spring Security的配置类SecurityConfig。里面有一个SecurityFilterChain的配置方法,其中在exceptionHandling部分,使用了jwtAccessDeniedHandler。 首先,我应该检查这个变量是否在类中被正确声明。查看SecurityConfig类,用户使用了@RequiredArgsConstructor注解,这通常是Lombok的注解,会自动生成一个包含所有final字段的构造函数。所以,我需要确认是否有名为jwtAccessDeniedHandler的final字段被声明。 在代码中,SecurityConfig的字段只有一个private final JwtAuthenticationFilter jwtAuthFilter;,而没有jwtAccessDeniedHandler或jwtAuthEntryPoint。这说明这两个变量没有被声明为类的成员变量,导致在exceptionHandling中使用时无法解析符号。 接下来,可能的解决方案是,用户需要在SecurityConfig类中添加这两个字段作为final变量,并且通过构造函数注入。因为@RequiredArgsConstructor会为所有final字段生成构造参数,所以正确添加后,Lombok会自动处理构造函数,这样在配置方法中就可以正确引用了。 此外,还需要确认用户是否已经定义了这两个处理器的Bean,比如JwtAuthenticationEntryPoint和JwtAccessDeniedHandler的实现类,并且在其他地方通过@Component或其他方式注册为Spring Bean。如果这些Bean不存在,即使字段添加了,也会导致注入失败。 总结来说,用户的问题是因为在SecurityConfig类中缺少了jwtAccessDeniedHandler和jwtAuthEntryPoint的字段声明。需要添加这两个final字段,并确保对应的Bean存在,这样Spring才能正确注入,解决符号无法解析的问题。</think>在您提供的 Spring Security 配置代码中,出现 `无法解析符号 &#39;jwtAccessDeniedHandler&#39;` 错误的原因是: ### 问题根源分析 1. **缺失依赖注入** 在 `SecurityConfig` 类中使用了 `jwtAccessDeniedHandler`,但未通过以下方式声明: - ❌ 未通过 `private final` 字段声明 - ❌ 未通过构造函数注入(`@RequiredArgsConstructor` 仅作用于已声明的 `final` 字段) 2. **Spring Bean 缺失** 需要确保 `jwtAccessDeniedHandler` 和 `jwtAuthEntryPoint` 已定义为 Spring Bean(例如通过 `@Component` 注解)。 --- ### 修复步骤 1. **添加字段声明** 在 `SecurityConfig` 类中添加以下字段: ```java private final JwtAuthenticationEntryPoint jwtAuthEntryPoint; // 处理认证异常 private final JwtAccessDeniedHandler jwtAccessDeniedHandler; // 处理授权异常 ``` 2. **确保 Lombok 生效** 由于使用了 `@RequiredArgsConstructor`,Lombok 会为所有 `final` 字段生成构造函数参数,确保: - 项目中已安装 Lombok 插件 - `pom.xml`/`build.gradle` 中包含 Lombok 依赖 3. **创建对应的 Bean 实现类** 需要自行实现以下两个类并标注 `@Component`: ```java @Component public class JwtAuthenticationEntryPoint implements AuthenticationEntryPoint { @Override public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException) throws IOException { // 处理未认证访问受保护资源的逻辑 response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Unauthorized"); } } @Component public class JwtAccessDeniedHandler implements AccessDeniedHandler { @Override public void handle(HttpServletRequest request, HttpServletResponse response, AccessDeniedException accessDeniedException) throws IOException { // 处理已认证但无权限访问的逻辑 response.sendError(HttpServletResponse.SC_FORBIDDEN, "Forbidden"); } } ``` --- ### 修复后完整代码结构 ```java @Configuration @EnableWebSecurity @RequiredArgsConstructor public class SecurityConfig { // 新增的依赖字段 private final JwtAuthenticationFilter jwtAuthFilter; private final JwtAuthenticationEntryPoint jwtAuthEntryPoint; private final JwtAccessDeniedHandler jwtAccessDeniedHandler; @Bean public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception { http .securityMatcher("/api/**") .csrf(AbstractHttpConfigurer::disable) .authorizeHttpRequests(authorize -> authorize .requestMatchers(HttpMethod.POST, "/user/reg_password", "/user/loginPassword") .permitAll() .anyRequest().authenticated() ) .sessionManagement(session -> session .sessionCreationPolicy(SessionCreationPolicy.STATELESS) ) .exceptionHandling(exceptions -> exceptions .authenticationEntryPoint(jwtAuthEntryPoint) .accessDeniedHandler(jwtAccessDeniedHandler) ) .addFilterBefore(jwtAuthFilter, UsernamePasswordAuthenticationFilter.class); return http.build(); } @Bean public PasswordEncoder passwordEncoder() { return new BCryptPasswordEncoder(); } } ``` --- ### 验证要点 1. **编译检查** 确保 IDE 中不再报 `无法解析符号` 错误。 2. **功能测试** - 测试未登录时访问受保护接口应返回 401 Unauthorized - 测试低权限用户访问高权限接口应返回 403 Forbidden 如果问题仍然存在,请检查 Maven/Gradle 的依赖刷新状态或重启 IDE。
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