Address issue with embedded certificates in JWT x5c #6440
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Co-authored-by: Max <maxtropets@gmail.com>
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There is an issue with the way the Verifier_OpenSSL::Verifier_OpenSSL handles being constructed from either a DER or a PEM.
The code initially tries to construct and X509 type with
Unique_X509(certbio, true /* pem */)before retrying withUnique_X509(certbio, false /* pem */)in case the value is DER.Unique_X509()callsPEM_read_bio_X509()internally, which ignores all input prior to-----BEGIN CERTIFICATE-----, and parses from there.If a certificate embeds other certificates, and is provided in DER form, this results in mis-parsing as the nested certificate.
Longer term, we should avoid calls that take
DER|PEMand have a static distinction. For the time being, this adds a validation check to the content before handing it toPEM_read_bio_X509().