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https://issues.apache.org/jira/browse/SOLR-4470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13673717#comment-13673717
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Tim Vaillancourt commented on SOLR-4470:
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I would agree with putting security at the container level if SolrCloud would 
actually function under that sort of implementation. The reality though is it 
does not work - inter-node requests fail, several things break.

That distinction to me DOES make this patch/issue "Solr's problem" to solve, 
and I don't look at that as a bad thing, but a normal one in software 
development. I also don't agree that fixing an issue like this commits the Solr 
Project to being on the hook for security, either. No one expects backend 
datastores to be on the hook for security, but they still work on it lightly 
from time to time when it blocks valid use cases for the tech.

Maybe I'm missing something - is there a way for SolrCloud to 100% work, 
passing all tests with container-level ONLY security? If there is a way, then I 
don't need this patch, but I don't think that is the case.
                
> 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: New Feature
>          Components: clients - java, multicore, replication (java), SolrCloud
>    Affects Versions: 4.0
>            Reporter: Per Steffensen
>            Assignee: Jan Høydahl
>              Labels: authentication, https, solrclient, solrcloud, ssl
>             Fix For: 4.4
>
>         Attachments: SOLR-4470_branch_4x_r1452629.patch, 
> SOLR-4470_branch_4x_r1452629.patch, SOLR-4470_branch_4x_r1454444.patch, 
> SOLR-4470.patch
>
>
> 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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