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https://issues.apache.org/jira/browse/SOLR-3161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217373#comment-13217373
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Jan Høydahl commented on SOLR-3161:
-----------------------------------

Since when did we start focusing on security in Solr's APIs? The policy has 
been that Solr is by design insecure and must be locked down. I agree that not 
knowing that it is possible to do {{/select?qt=/update}} may lead someone to 
expose full access to Solr to external clients, and it would not hurt to plug 
that hole. But in my opinion {{qt=<name>}} is as much part of Solr's public 
APIs and toolset as is {{hl=true}}, and we should think before simplifying 
this. We're not talking about using {{/select}} for "everything", but have the 
ability to use for querying.

I've had customers with external frameworks supporting Solr, but not supporting 
multiple different query URLs. Solr query URL is typically configured once in a 
config. However, the ability to plug in {{qt}} dynaically for different parts 
of the GUI saves the day.
                
> Use of 'qt' should be restricted to searching and should not start with a '/'
> -----------------------------------------------------------------------------
>
>                 Key: SOLR-3161
>                 URL: https://issues.apache.org/jira/browse/SOLR-3161
>             Project: Solr
>          Issue Type: Improvement
>          Components: search, web gui
>            Reporter: David Smiley
>            Assignee: David Smiley
>             Fix For: 3.6, 4.0
>
>
> I haven't yet looked at the code involved for suggestions here; I'm speaking 
> based on how I think things should work and not work, based on intuitiveness 
> and security. In general I feel it is best practice to use '/' leading 
> request handler names and not use "qt", but I don't hate it enough when used 
> in limited (search-only) circumstances to propose its demise. But if someone 
> proposes its deprecation that then I am +1 for that.
> Here is my proposal:
> Solr should error if the parameter "qt" is supplied with a leading '/'. 
> (trunk only)
> Solr should only honor "qt" if the target request handler extends 
> solr.SearchHandler.
> The new admin UI should only use 'qt' when it has to. For the query screen, 
> it could present a little pop-up menu of handlers to choose from, including 
> "/select?qt=mycustom" for handlers that aren't named with a leading '/'. This 
> choice should be positioned at the top.
> And before I forget, me or someone should investigate if there are any 
> similar security problems with the shards.qt parameter. Perhaps shards.qt can 
> abide by the same rules outlined above.
> Does anyone foresee any problems with this proposal?
> On a related subject, I think the notion of a default request handler is bad 
> - the default="true" thing. Honestly I'm not sure what it does, since I 
> noticed Solr trunk redirects '/solr/' to the new admin UI at '/solr/#/'. 
> Assuming it doesn't do anything useful anymore, I think it would be clearer 
> to use <requestHandler name="/select" class="solr.SearchHandler"> instead of 
> what's there now. The delta is to put the leading '/' on this request handler 
> name, and remove the "default" attribute.

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