一、背景

亲测可用,之前搜索了很多博客，啥样的都有，就是不介绍报错以及配置用处，根本不懂照抄那些配置是干啥的，稀里糊涂的按照博客搭完也跑不起来，因此记录这个。

项目背景：公司项目当前采用http协议+shiro+mysql的登录认证方式，而现在想支持ldap协议认证登录然后能够访问自己公司的项目网站。

举例说明：假设我们公司有自己的门户网站，现在我们收购了一家公司，他们数据库采用ldap存储用户数据，那么为了他们账户能登陆我们公司项目所以需要集成，而不是再把他们的账户重新在mysql再创建一遍，万一人家有1W个账户呢，不累死了且也不现实啊。

需要安装openldap+kerberos，且ldap和kerberos安装在同一台服务器上，当前版本如下：

• centos 7.9
• openldap 2.4.44
• phpldapadmin 1.2.5
• 服务器IP：10.110.38.162
• Kerberos ：Kerberos 5 release 1.15.1

另外介绍下我的Spring各个版本：

• Spring Security：4.2.3.RELEASE
• Spring Version：4.3.9.RELEASE
• SpringBoot Version：1.4.7.RELEASE

注意点1：我之所以选这么旧的版本，是因为我最后要在自己项目集成，我们项目就是上面版本附近的，所以不能选太高版本，这点请注意各版本之间的兼容性问题。
详情可看这篇博客介绍兼容版本：https://zhuanlan.zhihu.com/p/652895555

注意点2：如果里面的某些配置不知道在哪或者不知道干啥的，可以看我的前面的博客，详细介绍了安装配置等，可以大致了解参数。

目前网上相关文章很少，而且好多博客都是未认证就发布的所以一堆问题，跑不起来，如下是我参考的博客

• Spring Security Kerberos - Reference Documentation
• MIT Kerberos Documentation
• https://www.openldap.org/
• Authentication Protocols: LDAP vs Kerberos vs OAuth2 vs SAML vs RADIUS

二、报错

完整错误

Cannot locate KDC
javax.security.auth.login.LoginException: Cannot locate KDC
        at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:808)
        at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:618)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at javax.security.auth.login.LoginContext.invoke(LoginContext.java:755)
        at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195)
        at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682)
        at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
        at javax.security.auth.login.LoginContext.login(LoginContext.java:587)
        at com.example.ldaptest2.controller.TestController.authenticateUserByPassword(TestController.java:77)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:115)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:169)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:121)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:100)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
        at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
Caused by: KrbException: Cannot locate KDC
        at sun.security.krb5.Config.getKDCList(Config.java:1189)
        at sun.security.krb5.KdcComm.send(KdcComm.java:218)
        at sun.security.krb5.KdcComm.send(KdcComm.java:200)
        at sun.security.krb5.KrbAsReqBuilder.send(KrbAsReqBuilder.java:343)
        at sun.security.krb5.KrbAsReqBuilder.action(KrbAsReqBuilder.java:447)
        at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:770)
        ... 100 more
Caused by: KrbException: Generic error (description in e-text) (60) - Unable to locate KDC for realm NODE3.COM
        at sun.security.krb5.Config.getKDCFromDNS(Config.java:1286)
        at sun.security.krb5.Config.getKDCList(Config.java:1162)

错误代码

//用户+密码认证
@Test
public void authenticateUserByPassword() {
   
    try {
   
        // 创建 LoginContext 对象，并为其提供自定义 Configuration
        LoginContext lc = new LoginContext("KrbLogin", null, new MyCallbackHandler(), new CustomConfigurationByPassword());

        // 进行 Kerberos 认证
        lc.login();
        // 获取 Subject
        Subject subject = lc.getSubject();
//            logger.info("subject:{}", subject);
        // 在这里可以使用 subject 来执行进一步的操作，如访问受限资源
        // 登出
        lc.logout();
    } catch (LoginException e) {
   
        // 处理登录异常
        e.printStackTrace();
    }
}

场景描述：windows本地跑项目，我的ldap+kerberos安装在38.162环境，我想本地windows上连接38.162服务器进行kerberos用户认证。

错误原因：没有注入配置文件，人家代码凭啥能精准找到38.162服务器上，你得导入配置文件啊，因为你的项目中只有ldap服务的一些配置，压根kerberos的相关配置，且代码中只引入CustomConfigurationByPassword，里面压根没有指定IP啥的地方。

解决方案：设置：System.setProperty("java.security.krb5.conf", "/xxx/krb5.conf");

正确代码：

//用户+密码认证
@Test
public void authenticateUserByPassword() {
   
    try {
   
        System.setProperty("java.security.krb5.conf", "C:\\Users\\211145187\\Desktop\\fsdownload\\krb5.conf");
        // 创建 LoginContext 对象，并为其提供自定义 Configuration
        LoginContext lc = new LoginContext("KrbLogin", null, new MyCallbackHandler(), new CustomConfigurationByPassword());

        // 进行 Kerberos 认证
        lc.login();
        // 获取 Subject
        Subject subject = lc.getSubject();
//            logger.info("subject:{}", subject);
        // 在这里可以使用 subject 来执行进一步的操作，如访问受限资源
        // 登出
        lc.logout();
    } catch (LoginException e) {
   
        // 处理登录异常
        e.printStackTrace();
    }
}

思路讲解：首先把配置文件krb5.conf下载下来，然后当你代码注入System.setProperty配置文件的时候，项目就会读取配置文件内容，其中的kdc就配置了10.110.38.162，所以项目代码就知道连接到哪里进行kerberos认证了。

krb5.conf

# Configuration snippets may be placed in this directory as well
includedir /etc/krb5.conf.d/

[logging]
 default = FILE:/var/log/krb5libs.log
 kdc = FILE:/var/log/krb5kdc.log
 admin_server = FILE:/var/log/kadmind.log

[libdefaults]
 dns_lookup_realm = false
 ticket_lifetime = 24h
 #renew_lifetime = 7d
 forwardable = true
 rdns = false
 pkinit_anchors = FILE:/etc/pki/tls/certs/ca-bundle.crt
 default_realm = NODE3.COM
# default_ccache_name = KEYRING:persistent:%{
   uid}

[realms]
 NODE3.COM = {
   
 # kdc = kdc.node.com
 # admin_server = kdc.node.com
  kdc = 10.110.38.162
  admin_server = 10.110.38.162
  ldap_servers = ldap://10.110.38.162:389

 # kdc = node3.com:88
 # admin_server = node3.com:749
 # default_domain = NODE3.COM
 }

[domain_realm]
 .node3.com = NODE3.COM
 node3.com = NODE3.COM

本人其他相关文章链接

1.Centos7.9安装openldap
2.Centos7.9安装kerberos
3.Openldap集成Kerberos
4.Centos7.9安装phpldapadmin
5.java连接ldap实现用户查询功能
6.java连接kerberos用户认证
7.javax.security.auth.login.LoginException: Unable to obtain password from user
8.javax.security.auth.login.LoginException: null (68)
9.javax.security.auth.login.LoginException: Message stream modified (41)
10.javax.security.auth.login.LoginException: Checksum failed
11.javax.security.auth.login.LoginException: No CallbackHandler available to garner authentication info
12.javax.security.auth.login.LoginException: Cannot locate KDC
13.javax.security.auth.login.LoginException: Receive timed out
14.java: 无法访问org.springframework.context.ConfigurableApplicationContext
15.LDAP: error code 34 - invalid DN
16.LDAP: error code 32 - No Such Object
17.java: 无法访问org.springframework.ldap.core.LdapTemplate