Spring Boot Actuator - LDAP Health Endpoint抛出NPE

Question

在Spring Boot应用程序中，我们使用spring-security-ldap对可以访问我们应用程序的用户进行身份验证。我们没有看到身份验证在功能上有任何问题，但是当我们点击ldap时，我们得到了/authenticator/health的以下状态：

"ldap": {
    "status": "DOWN",
    "error": "java.lang.NullPointerException: null"
}

跟踪这个空指针异常，我们在尝试访问env.put(Context.SECURITY_PRINCIPAL, userDn);时会得到这个跟踪

java.lang.NullPointerException: null
    at java.util.Hashtable.put(Unknown Source) ~[na:1.8.0_111]
    at org.springframework.ldap.core.support.SimpleDirContextAuthenticationStrategy.setupEnvironment(SimpleDirContextAuthenticationStrategy.java:42) ~[spring-ldap-core-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.ldap.core.support.AbstractContextSource.setupAuthenticatedEnvironment(AbstractContextSource.java:194) ~[spring-ldap-core-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.ldap.core.support.AbstractContextSource.getAuthenticatedEnv(AbstractContextSource.java:582) ~[spring-ldap-core-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.ldap.core.support.AbstractContextSource.doGetContext(AbstractContextSource.java:134) ~[spring-ldap-core-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.ldap.core.support.AbstractContextSource.getReadOnlyContext(AbstractContextSource.java:158) ~[spring-ldap-core-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.ldap.core.LdapTemplate.executeReadOnly(LdapTemplate.java:802) ~[spring-ldap-core-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.boot.actuate.health.LdapHealthIndicator.doHealthCheck(LdapHealthIndicator.java:46) ~[spring-boot-actuator-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    at org.springframework.boot.actuate.health.AbstractHealthIndicator.health(AbstractHealthIndicator.java:43) ~[spring-boot-actuator-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    at org.springframework.boot.actuate.health.CompositeHealthIndicator.health(CompositeHealthIndicator.java:68) [spring-boot-actuator-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    at org.springframework.boot.actuate.endpoint.HealthEndpoint.invoke(HealthEndpoint.java:81) [spring-boot-actuator-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    at org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint.getHealth(HealthMvcEndpoint.java:171) [spring-boot-actuator-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    at org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint.invoke(HealthMvcEndpoint.java:145) [spring-boot-actuator-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_111]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_111]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_111]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_111]
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) [spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) [spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) [spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) [spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) [spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) [spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) [spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) [spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) [tomcat-embed-core-8.5.15.jar:8.5.15]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) [spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) [tomcat-embed-core-8.5.15.jar:8.5.15]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-8.5.15.jar:8.5.15]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.15.jar:8.5.15]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.15.jar:8.5.15]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.15.jar:8.5.15]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.15.jar:8.5.15]
...

最后，下面是我们的安全配置：

@Configuration
@EnableWebSecurity
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Value("${security.ldap.url}")
    private String ldapUrl;
    @Value("${security.ldap.user-search-base}")
    private String ldapUserSearchBase;
    @Value("${security.ldap.group-search-base}")
    private String ldapGroupSearchBase;
    @Value("${security.ldap.group-role-attribute}")
    private String ldapGroupRoleAttribute;
    @Value("${security.ldap.authorized-role}")
    private String ldapAuthorizedRole;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        // secure all core/data rest endpoints with basic auth
        http.authorizeRequests()
                .antMatchers("/core/data/unauthenticated/**").permitAll()
                .antMatchers("/core/data/**").hasRole(ldapAuthorizedRole)
                .and().httpBasic()
                .and().csrf().disable();

        // do not create sessions for security
        http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
    }

    @Autowired
    public void configure(AuthenticationManagerBuilder auth) throws Exception {
        // use ldap as the authentication provider
        auth.ldapAuthentication()
                .userSearchBase(ldapUserSearchBase)
                .userSearchFilter("(uid={0})")
                .groupSearchBase(ldapGroupSearchBase)
                .groupSearchFilter("uniqueMember={0}")
                .groupRoleAttribute(ldapGroupRoleAttribute)
                .contextSource()
                .url(ldapUrl);
    }

}

现在，我们确实在控制台中收到了一条消息，上面写着2017-10-24 12:37:28.867 INFO 12788 --- [ restartedMain] o.s.l.c.support.AbstractContextSource : Property 'userDn' not set - anonymous context will be used for read-write operations，但这是我们的期望，我们对此很满意。看起来健康终端并没有尊重这一点。我不知道这是我们的代码的bug，还是Spring Boot的自动配置问题。

我对Actuator端点的工作原理有点不熟悉，所以如果这是显而易见的，请向我道歉。谢谢!

Answer 1

这是一个提交了修复的spring-ldap bug，但它似乎还没有合并到主spring-ldap分支中。

但是，我发现在application.properties中添加此属性可以解决此问题：

management.health.ldap.enabled=false

Answer 2

另一种解决方案是在LDAP Spring属性中输入凭据，以便它们被LDAPAutoConfiguration拾取：

spring.ldap.username=myuser@mydomain.com
spring.ldap.password=secret
spring.ldap.urls=ldap://mydomain.com:389

这样，您仍然可以使用运行状况检查。