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https://issues.apache.org/jira/browse/SLING-1831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Felix Meschberger resolved SLING-1831.
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Resolution: Fixed
Modified the default behaviour to try to send back 401/UNAUTHORIZED (as in the
presumed WebDAV case) and only fall back to 403 if HTTP Basic is completely
switched off in Rev. 1021641.
> Prevent Login Request loop
> --------------------------
>
> Key: SLING-1831
> URL: https://issues.apache.org/jira/browse/SLING-1831
> Project: Sling
> Issue Type: Improvement
> Components: Authentication
> Affects Versions: Auth Core 1.0.2
> Reporter: Felix Meschberger
> Assignee: Felix Meschberger
> Fix For: Auth Core 1.0.4
>
>
> Depending on AuthenticationHandler specifics it is conceivable that the Sling
> Authenticator support may enter an endless redirect loop with the client.
> Consider this:
> #1 client provides wrong credentials (e.g. cookie, HTTP Basic
> authentication header)
> #2 authenticator decides to call AuthenticationHandler.requestCredentials
> #3 authentication handler sends a redirect to the client
> #4 client requests redirect target again providing wrong credentials
> #5 authenticator decides to call AuthenticationHandler.requestCredentials
> #6 continue with step #3
> This loop should be broken in the authenticator: As soon as the authenticator
> recognizes a (potential) redirect loop, the authentication handler should not
> be called again but instead an immediate error response should be sent back.
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