[jira] [Created] (HADOOP-15922) DelegationTokenAuthenticationFilter get wrong doAsUser since it does not decode URL

["He Xiaoqiao (JIRA)" <ji...@apache.org>]

He Xiaoqiao created HADOOP-15922:
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             Summary: DelegationTokenAuthenticationFilter get wrong doAsUser since it does not decode URL
                 Key: HADOOP-15922
                 URL: https://issues.apache.org/jira/browse/HADOOP-15922
             Project: Hadoop Common
          Issue Type: Bug
          Components: common, kms
            Reporter: He Xiaoqiao
            Assignee: He Xiaoqiao


DelegationTokenAuthenticationFilter get wrong doAsUser when proxy user from client is complete kerberos name (e.g., user/hostname@REALM.COM, actually it is acceptable), because DelegationTokenAuthenticationFilter does not decode DOAS parameter in URL which is encoded by {{URLEncoder}} at client.
e.g. KMS as example:
a. KMSClientProvider creates connection to KMS Server using DelegationTokenAuthenticatedURL#openConnection.
b. If KMSClientProvider is a doAsUser, KMSClientProvider will put {{doas}} with url encoded user as one parameter of http request. 
{code:java}
    // proxyuser
    if (doAs != null) {
      extraParams.put(DO_AS, URLEncoder.encode(doAs, "UTF-8"));
    }
{code}
c. when KMS server receives the request, it does not decode the proxy user.

As result, KMS Server will get the wrong proxy user if this proxy user is complete Kerberos Name or it includes some special character. Some other authentication and authorization exception will throws next to it.



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