[jira] [Created] (HDFS-17276) The nn fetch editlog failed in kerberos environment

["kuper (Jira)" <ji...@apache.org>]

kuper created HDFS-17276:
----------------------------

             Summary: The nn fetch editlog failed in kerberos environment
                 Key: HDFS-17276
                 URL: https://issues.apache.org/jira/browse/HDFS-17276
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: qjm, security
    Affects Versions: 3.3.6, 3.3.5
            Reporter: kuper
         Attachments: image-2023-12-06-20-21-03-557.png, image-2023-12-06-20-21-46-825.png

* In a Kerberos environment, the namenode cannot fetch editlog from journalnode because the request is rejected (403). !image-2023-12-06-20-21-03-557.png!
 * GetJournalEditServlet checks if the request's username meets the requirements through the isValidRequestor function. After HDFS-16686 is merged, remotePrincipal becomes ugi.getUserName().
 * In a Kerberos environment, ugi.getUserName() gets the request.getRemoteUser() via DfsServlet's getUGI to get the username, and this username is not a full name.
 * Therefore, the obtained username is similar to namenode01 instead of namenode01/host01@@REALM.TLD, which meansit fails to pass the isValidRequestor check. !image-2023-12-06-20-21-46-825.png!

*reproduction*
 * In the TestGetJournalEditServlet add testSecurityRequestNameNode

{code:java}
@Test
public void testSecurityRequestNameNode() throws IOException, ServletException {
  // Test: Make a request from a namenode
  CONF.set(HADOOP_SECURITY_AUTHENTICATION, "kerberos");
  UserGroupInformation.setConfiguration(CONF);
  
  HttpServletRequest request = mock(HttpServletRequest.class);
    when(request.getParameter(UserParam.NAME)).thenReturn("nn/localhost@REALM.TLD");
  when(request.getRemoteUser()).thenReturn("jn");
  boolean isValid = SERVLET.isValidRequestor(request, CONF);
  
  assertThat(isValid).isTrue();
} {code}



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