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https://issues.apache.org/jira/browse/SOLR-9200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15470485#comment-15470485
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Ishan Chattopadhyaya commented on SOLR-9200:
--------------------------------------------
I think a section on delegation tokens can be added to the ref guide page for
Kerberos Plugin. Here's a proposed wording (based on the original description
in this issue):
{quote}
Delegation tokens
-----------------
The Kerberos plugin can, optionally, be configured to use delegation tokens.
The plugin allows authenticated users the ability to grab, renew or delete a
token that can be used to bypass the normal authentication path for a time.
This is useful in a variety of use cases:
1) distributed clients (e.g. MapReduce) where each client may not have access
to the user's Kerberos credentials. Instead, the job runner can grab a
delegation token and use that during task execution.
2) If the load on the Kerberos server is too high, delegation tokens can avoid
hitting the Kerberos server after the first request.
3) If requests/permissions need to be delegated to another user: the more
privileged user can request a delegation token that can be passed to the less
privileged user.
Enabling delegation tokens can be done by setting the
{{solr.kerberos.delegation.token.enabled}} parameter to true.
{quote}
> Add Delegation Token Support to Solr
> ------------------------------------
>
> Key: SOLR-9200
> URL: https://issues.apache.org/jira/browse/SOLR-9200
> Project: Solr
> Issue Type: New Feature
> Components: security
> Reporter: Gregory Chanan
> Assignee: Gregory Chanan
> Fix For: 6.2, master (7.0)
>
> Attachments: SOLR-9200.patch, SOLR-9200.patch, SOLR-9200.patch,
> SOLR-9200.patch, SOLR-9200.patch, SOLR-9200_branch_6x.patch,
> SOLR-9200_branch_6x.patch, SOLR-9200_branch_6x.patch
>
>
> SOLR-7468 added support for kerberos authentication via the hadoop
> authentication filter. Hadoop also has support for an authentication filter
> that supports delegation tokens, which allow authenticated users the ability
> to grab/renew/delete a token that can be used to bypass the normal
> authentication path for a time. This is useful in a variety of use cases:
> 1) distributed clients (e.g. MapReduce) where each client may not have access
> to the user's kerberos credentials. Instead, the job runner can grab a
> delegation token and use that during task execution.
> 2) If the load on the kerberos server is too high, delegation tokens can
> avoid hitting the kerberos server after the first request
> 3) If requests/permissions need to be delegated to another user: the more
> privileged user can request a delegation token that can be passed to the less
> privileged user.
> Note to self:
> In
> https://issues.apache.org/jira/browse/SOLR-7468?focusedCommentId=14579636&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14579636
> I made the following comment which I need to investigate further, since I
> don't know if anything changed in this area:
> {quote}3) I'm a little concerned with the "NoContext" code in KerberosPlugin
> moving forward (I understand this is more a generic auth question than
> kerberos specific). For example, in the latest version of the filter we are
> using at Cloudera, we play around with the ServletContext in order to pass
> information around
> (https://github.com/cloudera/lucene-solr/blob/cdh5-4.10.3_5.4.2/solr/core/src/java/org/apache/solr/servlet/SolrHadoopAuthenticationFilter.java#L106).
> Is there any way we can get the actual ServletContext in a plugin?{quote}
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