David Mollitor created HIVE-23704:
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             Summary: Thrift HTTP Server Does Not Handle Auth Handle Correctly
                 Key: HIVE-23704
                 URL: https://issues.apache.org/jira/browse/HIVE-23704
             Project: Hive
          Issue Type: Bug
          Components: Security
    Affects Versions: 2.3.7, 3.1.2
            Reporter: David Mollitor
            Assignee: David Mollitor
             Fix For: 4.0.0
         Attachments: Base64NegotiationError.png

{code:java|title=ThriftHttpServlet.java}
  private String[] getAuthHeaderTokens(HttpServletRequest request,
      String authType) throws HttpAuthenticationException {
    String authHeaderBase64 = getAuthHeader(request, authType);
    String authHeaderString = StringUtils.newStringUtf8(
        Base64.decodeBase64(authHeaderBase64.getBytes()));
    String[] creds = authHeaderString.split(":");
    return creds;
  }
{code}

So here, it takes the authHeaderBase64 (which is a base-64 string), and 
converts it into bytes, and then it tries to decode those bytes.  That is 
incorrect   It should covert base-64 string directly into bytes.

I tried to do this as part of [HIVE-22676] and the tests was failing because 
the string that is being decoded is not actually Base-64 (see attached image).  
Again, the existing code doesn't care because it's not parsing Base-64 text, it 
is parsing the bytes generated by converting base-64 text to bytes.

I'm not sure what affect this has, what security issues this may present, but 
it's definitely not correct.



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