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https://issues.apache.org/jira/browse/KNOX-3458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandor Molnar updated KNOX-3458:
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Status: Patch Available (was: Open)
> Enforce a maximum actor-chain (act claim) depth in token exchange
> -----------------------------------------------------------------
>
> Key: KNOX-3458
> URL: https://issues.apache.org/jira/browse/KNOX-3458
> Project: Apache Knox
> Issue Type: Sub-task
> Components: Server
> Affects Versions: 3.1.0
> Reporter: Sandor Molnar
> Assignee: Sandor Molnar
> Priority: Major
> Fix For: 3.1.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> The RFC 8693 act claim chain is walked and rebuilt with no depth bound
> anywhere: {{TokenUtils.extractActorChain()}}, {{addActorToChain()}}, and
> {{buildNestedActClaim()}} all iterate unbounded, and
> {{ActorChainPrincipalImpl}} does no validation. A deeply nested act claim can
> grow without limit across successive delegation exchanges.
> Scope: Add a configurable maximum chain depth (e.g.
> {{delegation.max.actor.chain.depth}}) and enforce it at the point the chain
> is about to grow - TokenResource.handleDelegatedAuthentication() /
> TokenUtils.addActorToChain() (last chance before minting), rejecting the
> exchange when the resulting depth would exceed the bound. Default to 10.
> Note: {{TokenExchangeHandler.auditMessage()}} already lists
> {{act_chain_depth}} as a deliberately-omitted field. Audit it once enforced.
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