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https://issues.apache.org/jira/browse/SOLR-4470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13583030#comment-13583030
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Per Steffensen edited comment on SOLR-4470 at 2/21/13 9:17 AM:
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bq. then put a programmable proxy in front of Solr, like Varnish or something

Uhhh, I think that is too much to require for doing faily simple authorization. 
And depending on where you put Varnish the authorization might not be preformed 
on solr-to-solr requests, and one of the focus points here is to make sure it 
is, because we basically do not want to make it possible to have a solr-to-solr 
request R2 performed as a direct reaction to a request R1 comming from "the 
outside", where the "outside user" is authorized to do R1 but not to do R2.

But I guess it can fairly easy be done using a filter, and I will put up a 
description on Wiki on how to do it. We are going to do it anyway in my project.
                
      was (Author: steff1193):
    bq. then put a programmable proxy in front of Solr, like Varnish or 
something

Uhhh, I think that is too much to require for doing faily simple authorization. 
And depending on where you put Varnish the authorization might not be preformed 
on solr-to-solr requests, and one of the focus points here is to make sure it 
is, because we basically do not want to make it possible to have a solr-to-solr 
request R2 performed as a direct reaction to a request R1 comming from "the 
outside", where the "outside user" is authorized to do R1 but not to do R2.
                  
> Support for basic http auth in internal solr requests
> -----------------------------------------------------
>
>                 Key: SOLR-4470
>                 URL: https://issues.apache.org/jira/browse/SOLR-4470
>             Project: Solr
>          Issue Type: Bug
>          Components: clients - java, multicore, replication (java), SolrCloud
>    Affects Versions: 4.0
>            Reporter: Per Steffensen
>              Labels: authentication, solrclient, solrcloud
>             Fix For: 4.2
>
>
> We want to protect any HTTP-resource (url). We want to require credentials no 
> matter what kind of HTTP-request you make to a Solr-node.
> It can faily easy be acheived as described on 
> http://wiki.apache.org/solr/SolrSecurity. This problem is that Solr-nodes 
> also make "internal" request to other Solr-nodes, and for it to work 
> credentials need to be provided here also.
> Ideally we would like to "forward" credentials from a particular request to 
> all the "internal" sub-requests it triggers. E.g. for search and update 
> request.
> But there are also "internal" requests
> * that only indirectly/asynchronously triggered from "outside" requests (e.g. 
> shard creation/deletion/etc based on calls to the "Collection API")
> * that do not in any way have relation to an "outside" "super"-request (e.g. 
> replica synching stuff)
> We would like to aim at a solution where "original" credentials are 
> "forwarded" when a request directly/synchronously trigger a subrequest, and 
> fallback to a configured "internal credentials" for the 
> asynchronous/non-rooted requests.
> In our solution we would aim at only supporting basic http auth, but we would 
> like to make a "framework" around it, so that not to much refactoring is 
> needed if you later want to make support for other kinds of auth (e.g. digest)
> We will work at a solution but create this JIRA issue early in order to get 
> input/comments from the community as early as possible.

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