Ignore keys of unknown alg when verifying JWTs with JWKS #4725
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anderseknert
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The ticket also has a request for improved documentation. At the very least, we should document this new behavior. |
Additionally, improve the JWT verification process when a JWKS is provided: * If `kid` is present in JWT header, and exists in JWKS — verify using that key only. * If `kid` not present in JWT header, try verification only using keys matching the `alg` provided in the JWT header (mandatory claim). Fixes open-policy-agent#4699 Signed-off-by: Anders Eknert <anders@eknert.com>
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If I understand the conversation between @lenalebt and @srenatus correctly, the suggested update to the docs would be to change the example not to use the raw body (i.e. string) representation of the JWKS, but to rather hack around the issue (fixed by this PR) by unmarshalling the JWKS, filter out the non-parseable key(s), and then marshall it back into a new JWKS to use for validation. The documented solution is AFAICS the correct one. |
johanfylling
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Jun 2, 2022
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Additionally, improve the JWT verification process when a JWKS
is provided:
kidis present in JWT header, and exists in JWKS — verify usingthat key only.
kidnot present in JWT header, try verification only using keysmatching the
algprovided in the JWT header (mandatory claim).Fixes #4699
Signed-off-by: Anders Eknert anders@eknert.com