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https://issues.apache.org/jira/browse/SOLR-12799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16722090#comment-16722090
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Cao Manh Dat commented on SOLR-12799:
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[~janhoy] I just pushed the merge to jira/http2 branch, if possible, can you
review it?
> Allow Authentication Plugins to easily intercept internode requests
> -------------------------------------------------------------------
>
> Key: SOLR-12799
> URL: https://issues.apache.org/jira/browse/SOLR-12799
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Authentication
> Reporter: Jan Høydahl
> Assignee: Jan Høydahl
> Priority: Major
> Fix For: master (8.0)
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Solr security framework currently allows a plugin to declare statically by
> implementing the {{HttpClientBuilderPlugin}} interface whether it will handle
> internode requests. If it implements the interface, the plugin MUST handle
> ALL internode requests, even requests originating from Solr itself. Likewise,
> if a plugin does not implement the interface, ALL requests will be
> authenticated by the built-in {{PKIAuthenticationPlugin}}.
> In some cases (such as SOLR-12121) there is a need to forward end-user
> credentials on internode requests, but let PKI handle it for solr-originated
> requests. This is currently not possible without a dirty hack where each
> plugin duplicates some PKI logic and calls PKI plugin from its own
> interceptor even if it is disabled.
> This Jira makes this use case officially supported by the framework by:
> * Letting {{PKIAuthenticationPlugin}} be always enabled. PKI will now in its
> interceptor on a per-request basis first give the authc plugin a chance to
> handle the request
> * Adding a protected method to abstract class {{AuthenticationPlugin}}
> {code:java}
> protected boolean interceptInternodeRequest(HttpRequest httpRequest,
> HttpContext httpContext)
> {code}
> that can be overridden by plugins in order to easily intercept requests
> without registering its own interceptor. Returning 'false' delegates to PKI.
> Existing Authc plugins do *not* need to change as a result of this, and they
> will work exactly as before, i.e. either handle ALL or NONE internode auth.
> New plugins choosing to *override* the new {{interceptInternodeRequest}}
> method will obtain per-request control over who will secure each request. The
> first user of this feature will be JWT token based auth in SOLR-12121.
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