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https://issues.apache.org/jira/browse/PROTON-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Clifford Jansen resolved PROTON-2856.
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Fix Version/s: proton-c-0.40.0
Resolution: Fixed
> Provide TLS support for intermediate CA certificates as trust anchors in
> OpenSSL
> ---------------------------------------------------------------------------------
>
> Key: PROTON-2856
> URL: https://issues.apache.org/jira/browse/PROTON-2856
> Project: Qpid Proton
> Issue Type: Improvement
> Components: proton-c
> Affects Versions: proton-c-0.39.0
> Environment: Proton-C built with OpenSSL
> Reporter: Clifford Jansen
> Assignee: Clifford Jansen
> Priority: Major
> Fix For: proton-c-0.40.0
>
>
> The current implementation of TLS in Proton-C uses the default certificate
> verification algorithms provided by the OpenSLL library.
> This has the effect of making it difficult to use intermediate CA
> certificates in Proton-C to provide finer grade security envelopes for use,
> for example, by different organizational units in an organization or to
> differentiate subnets in cloud environments. Currently an intermediate CA,
> by default, cannot be used to anchor a subtree of a parent root CA because
> the root CA must also be in the trust store, at which point the whole tree
> flowing from the root CA becomes trusted.
> This behavior goes against current user expectations and industry norms. See
> https://github.com/golang/go/issues/24685#issuecomment-1058119312
> This makes it difficult for Proton-C users to use certificate chain tooling
> that they already have in place.
> This JIRA proposes to set the X509_V_FLAG_PARTIAL_CHAIN flag when verifying
> peer certificates in OpenSSL.
> An additional advantage is a shortened verification sequence.
> After this change, existing trust stores for use with Proton-C that contain
> self-signed root certificates will continue to verify the whole subordinate
> trees of leaf certificates that flow from those roots. Users will now be
> able to create new trust stores that limit trust to subtrees anchored to
> intermediate CA certificates.
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