解决Spring Security中AuthenticationEntryPoint不生效相关问题

解决Spring Security中AuthenticationEntryPoint不生效相关问题，主要有以下几个步骤：

1. 确认AuthenticationEntryPoint是否配置正确

在Spring Security配置文件中，需要配置AuthenticationEntryPoint，用来处理认证失败后的跳转或返回错误信息。一些常见的AuthenticationEntryPoint包括：LoginUrlAuthenticationEntryPoint（跳转到指定登录页面）、Http403ForbiddenEntryPoint（返回403错误）等。

例如，我们配置了一个LoginUrlAuthenticationEntryPoint：

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private AuthenticationProvider authenticationProvider;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .antMatchers("/admin/**").hasRole("ADMIN")
            .anyRequest().authenticated()
            .and()
            .formLogin().loginPage("/login").permitAll()
            .and()
            .logout().permitAll();
        http.exceptionHandling().authenticationEntryPoint(new LoginUrlAuthenticationEntryPoint("/login"));
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(authenticationProvider);
    }
}

1. 确认认证失败后是否抛出正确的异常

AuthenticationEntryPoint通常是在认证失败后被调用。如果认证失败后没有抛出正确的异常，那么AuthenticationEntryPoint就不会生效。常见的异常包括：AccessDeniedException和BadCredentialsException等。可以通过在FilterChainProxy中添加一个ExceptionTranslationFilter来实现异常的抛出：

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private AuthenticationProvider authenticationProvider;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .antMatchers("/admin/**").hasRole("ADMIN")
            .anyRequest().authenticated()
            .and()
            .formLogin().loginPage("/login").permitAll()
            .and()
            .logout().permitAll();
        http.exceptionHandling().authenticationEntryPoint(new LoginUrlAuthenticationEntryPoint("/login"));
        http.addFilterBefore(new ExceptionTranslationFilter(new Http403ForbiddenEntryPoint()), FilterSecurityInterceptor.class);
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(authenticationProvider);
    }
}

1. 确认请求是否正确处理

最后，需要确认请求是否到达了正确的AuthenticationEntryPoint并得到了正确的处理。一种常见的请求处理方式是使用Spring Boot ErrorController：

@Controller
public class CustomErrorController implements ErrorController {

    private static final String ERROR_PATH = "/error";

    @RequestMapping(value = ERROR_PATH)
    public ResponseEntity<ErrorResponse> error(HttpServletRequest request, HttpServletResponse response) {
        ErrorResponse errorResponse = new ErrorResponse();
        errorResponse.setError("Unauthorized Request");
        errorResponse.setMessage("You need to sign in to access this page");
        return new ResponseEntity<>(errorResponse, HttpStatus.UNAUTHORIZED);
    }

    @Override
    public String getErrorPath() {
        return ERROR_PATH;
    }
}

以上就是解决Spring Security中AuthenticationEntryPoint不生效相关问题的完整攻略。

示例一：

在Spring Security中，如果我们使用了formLogin，但是用户输入的用户名或密码错误，会跳转到Spring Security默认的/login?error页面。此时，我们想要展示自定义的错误信息，可以用自定义的AuthenticationEntryPoint来处理。以下是一个示例：

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private AuthenticationProvider authenticationProvider;

    @Autowired
    private AuthenticationFailureHandler authenticationFailureHandler;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .antMatchers("/admin/**").hasRole("ADMIN")
            .anyRequest().authenticated()
            .and()
            .formLogin().loginPage("/login").failureHandler(authenticationFailureHandler).permitAll()
            .and()
            .logout().permitAll();
        http.exceptionHandling().authenticationEntryPoint(new LoginAuthenticationEntryPoint());
        http.addFilterBefore(new ExceptionTranslationFilter(new Http403ForbiddenEntryPoint()), FilterSecurityInterceptor.class);
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(authenticationProvider);
    }
}

public class LoginAuthenticationEntryPoint extends LoginUrlAuthenticationEntryPoint {

    public LoginAuthenticationEntryPoint() {
        super("/login");
    }

    @Override
    public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException) throws IOException, ServletException {
        response.setStatus(HttpStatus.UNAUTHORIZED.value());
        response.setContentType("application/json");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write("{\"message\": \"Invalid username or password\"}");
    }
}

示例二：

在Spring Security中，如果我们使用了basicAuth，但是用户没有提供正确的凭证，会返回401未授权的错误。此时，我们想要返回自定义的错误信息，可以通过自定义的BasicAuthenticationEntryPoint来处理。以下是一个示例：

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private AuthenticationProvider authenticationProvider;

    @Autowired
    private AuthenticationFailureHandler authenticationFailureHandler;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .antMatchers("/admin/**").hasRole("ADMIN")
            .anyRequest().authenticated()
            .and()
            .httpBasic().authenticationEntryPoint(new BasicAuthenticationEntryPointExtension())
            .and()
            .formLogin().loginPage("/login").failureHandler(authenticationFailureHandler).permitAll()
            .and()
            .logout().permitAll();
        http.exceptionHandling().authenticationEntryPoint(new LoginAuthenticationEntryPoint());
        http.addFilterBefore(new ExceptionTranslationFilter(new Http403ForbiddenEntryPoint()), FilterSecurityInterceptor.class);
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(authenticationProvider);
    }
}

public class BasicAuthenticationEntryPointExtension extends BasicAuthenticationEntryPoint {

    @Override
    public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException) throws IOException, ServletException {
        response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
        response.setHeader("WWW-Authenticate", "Basic realm=\"My Realm\"");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json;charset=UTF-8");
        JSONResult jsonResult = new JSONResult();
        jsonResult.setCode("401");
        jsonResult.setMessage("Unauthorized");
        response.getWriter().write(new ObjectMapper().writeValueAsString(jsonResult));
    }
}