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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15922) DelegationTokenAuthenticationFilter get wrong doAsUser since it does not decode URL
Date Fri, 30 Nov 2018 18:34:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16705131#comment-16705131

Eric Yang commented on HADOOP-15922:

If doAs=john/admin, the difference between patch 004 and 005 are:

Patch 004 will result in:
|In flight value |Old Server|New Server|
|Old Client (john%252Fadmin)|john%2Fadmin|john/admin|
|New Client (john%252Fadmin)|john%2Fadmin|john/admin|

Patch 005 will result in:
| In flight value|Old Server|New Server|
|Old Client (john%252Fadmin)|john%2Fadmin|john%2Fadmin|
|New Client (john%2Fadmin)|john/admin|john/admin|

If server store the old DO_AS user in database, it is an incompatible changes that server
needs to handle the decoded values differently between new client and old client.  Mark
this as incompatible change for precaution.

> 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
>            Priority: Major
>             Fix For: 3.3.0, 3.1.2, 3.2.1
>         Attachments: HADOOP-15922.001.patch, HADOOP-15922.002.patch, HADOOP-15922.003.patch,
HADOOP-15922.004.patch, HADOOP-15922.005.patch
> 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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