漫谈Spring Security 在Spring Boot 2.x endpoints中的应用（一）

Spring Boot 2.x极大简化了默认的安全配置，并不是说有很多安全相关的配置，现在你只需要提供一个WebSecurityConfigurerAdapter继承类这样一个简单的操作，Spring Boot就可以规避很多安全问题。

Actuator 不再有各自单独的安全配置（management.security.*配置已被取消），每个endpoint的sensitive 标志也会被取消，这样使得安全配置更加明确了。

比如说：你有如下配置

endpoints:
    info:
        sensitive: false
    mappings:
        sensitive: true
management:
    security:
        roles: MY_ADMIN

now,you can do it like this:

import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

/**
 * name: TestWebSecurityConfigureAdapter
 *
 * @author aboruo
 * @Description an example on adding our custom WebSecurityConfigurerAdapter
 * @Date create in 2019/9/9 20:50.
 */
@EnableWebSecurity
public class TestWebSecurityConfigureAdapter extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable().authorizeRequests()
                .antMatchers("/actuator/health","/actuator/info")
                .permitAll()
                .antMatchers("/actuator/**")
                .hasRole("MY_ADMIN")
                .and().httpBasic();
    }
}

请注意，在2.x中，默认情况下 health 和info 是可以被访问的，（默认情况下 health 的详细信息不能被访问显示）。 为了与这些新的默认值保持一致，health 已被添加到首要的mather中。

Spring boot 2.x 不引入Spring Security时，endpoint实现(未完待续)

1. 先在spring-boot-autoconfigure的spring.factories文件找到autoconfiguration类

查看此类

/**
 * {@link EnableAutoConfiguration Auto-configuration} for Spring Security.
 *
 * @author Dave Syer
 * @author Andy Wilkinson
 * @author Madhura Bhave
 * @since 1.0.0
 */
@Configuration
@ConditionalOnClass(DefaultAuthenticationEventPublisher.class)
@EnableConfigurationProperties(SecurityProperties.class)
@Import({ SpringBootWebSecurityConfiguration.class, WebSecurityEnablerConfiguration.class,
        SecurityDataConfiguration.class })
public class SecurityAutoConfiguration {

    @Bean
    @ConditionalOnMissingBean(AuthenticationEventPublisher.class)
    public DefaultAuthenticationEventPublisher authenticationEventPublisher(ApplicationEventPublisher publisher) {
        return new DefaultAuthenticationEventPublisher(publisher);
    }

}

DefaultAuthenticationEventPublisher： 默认使用的权限授权事件publisher

SecurityProperties: 安全设置相关属性配置文件，以：spring.security开头
通过 SecurityAutoConfiguration 又引入了几个关键的配置类

① SpringBootWebSecurityConfiguration

/**
 * The default configuration for web security. It relies on Spring Security's
 * content-negotiation strategy to determine what sort of authentication to use. If the
 * user specifies their own {@link WebSecurityConfigurerAdapter}, this will back-off
 * completely and the users should specify all the bits that they want to configure as
 * part of the custom security configuration.
 *
 * @author Madhura Bhave
 * @since 2.0.0
 */
@Configuration
@ConditionalOnClass(WebSecurityConfigurerAdapter.class)
@ConditionalOnMissingBean(WebSecurityConfigurerAdapter.class)
@ConditionalOnWebApplication(type = Type.SERVLET)
public class SpringBootWebSecurityConfiguration {

    @Configuration
    @Order(SecurityProperties.BASIC_AUTH_ORDER)
    static class DefaultConfigurerAdapter extends WebSecurityConfigurerAdapter {

    }

}

这是spring boot 默认的安全配置类，它依赖于Spring安全的*内容协商策略来确定使用哪种身份验证。通过代码，我们可以看到：

• 当用户定义了自己的WebSecurityConfigurerAdapter类时，SpringBootWebSecurityConfiguration将不会生效；
• 当应用是web应用且类型是SERVLET类型时才会生效

② WebSecurityEnablerConfiguration
这是一个确认配置类，顾名思义：当applicationContext中存在WebSecurityConfigureAdapter类型的bean时，它才会生效，它的职责是这类bean加@EnableWebSecurity注解。

/**
 * If there is a bean of type WebSecurityConfigurerAdapter, this adds the
 * {@link EnableWebSecurity} annotation. This will make sure that the annotation is
 * present with default security auto-configuration and also if the user adds custom
 * security and forgets to add the annotation. If {@link EnableWebSecurity} has already
 * been added or if a bean with name {@value BeanIds#SPRING_SECURITY_FILTER_CHAIN} has
 * been configured by the user, this will back-off.
 *
 * @author Madhura Bhave
 * @since 2.0.0
 */
@Configuration
@ConditionalOnBean(WebSecurityConfigurerAdapter.class)
@ConditionalOnMissingBean(name = BeanIds.SPRING_SECURITY_FILTER_CHAIN)
@ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.SERVLET)
@EnableWebSecurity
public class WebSecurityEnablerConfiguration {

}

③ SecurityDataConfiguration
当应用环境中存在SecurityEvaluationContextExtension类时，自动添加带有Spring Data 的 spring security 集成。

/**
 * Automatically adds Spring Security's integration with Spring Data.
 *
 * @author Rob Winch
 * @since 1.3.0
 */
@Configuration
@ConditionalOnClass(SecurityEvaluationContextExtension.class)
public class SecurityDataConfiguration {

    @Bean
    @ConditionalOnMissingBean
    public SecurityEvaluationContextExtension securityEvaluationContextExtension() {
        return new SecurityEvaluationContextExtension();
    }

}

后续我们会对

SecurityRequestMatcherProviderAutoConfiguration

UserDetailsServiceAutoConfiguration

SecurityFilterAutoConfiguration

OAuth2ClientAutoConfiguration

OAuth2ResourceServerAutoConfiguration

这几个类逐一进行介绍，从而来了解它的工作原理。