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https://issues.apache.org/jira/browse/HADOOP-15922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16690759#comment-16690759
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Eric Yang commented on HADOOP-15922:
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[~hexiaoqiao] The users list was changed to verify using shortname only in
HADOOP-6634, which drops the validation of server designation. This means
proxyuser credential validation hasn't worked as initially designed for 8 years
now. The current patch is good without digging into past changes.
+1 from my point of view. I will keep this open for other security experts to
check if we missed anything.
> 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
> Attachments: HADOOP-15922.001.patch, HADOOP-15922.002.patch,
> HADOOP-15922.003.patch, HADOOP-15922.004.patch
>
>
> DelegationTokenAuthenticationFilter get wrong doAsUser when proxy user from
> client is complete kerberos name (e.g., user/hostn...@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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