Ankur Mhatre
4dc45d5e00
Companion code for the follow-up article. The repository now holds two Maven
projects sharing one docs/ tree:
jwt-authentication/ the hand-written filter application (unchanged, moved)
oauth2-resource-server/ a resource server, a Keycloak compose, and a stub
issuer whose JWK Set can be mutated on command
The stub exists because Keycloak will not rotate a signing key at a chosen
second, report how many times its JWKS endpoint was fetched, or drop a key from
the published set on request - and the caching and rotation measurements need
all three. The Keycloak run confirms the same code path against a real issuer.
Findings captured under docs/output/, all from real runs:
* The default validator stack does not check aud. A token minted for another
service in the same realm is accepted.
* Spring Security builds its JWKSource with refreshAheadCache(false) and
rateLimited(false), overriding two of Nimbus's protective defaults, and
enables Nimbus caching only when NO Spring cache was supplied - so
supplying one removes the five-minute expiry.
* A key retired from the JWK Set stops being accepted at t+300s with the
default cache, and never with a Spring cache that has no TTL.
* 25 tokens carrying an unknown kid produce 25 JWKS fetches at the issuer,
through permitAll() endpoints included.
* A hyphenated client id in an authorities-claim-expression parses as
subtraction; the SpelEvaluationException is swallowed and logged at TRACE.
* A clientScopes key in a Keycloak realm import replaces the built-in scopes
rather than adding to them.
New docs chapters 12-18. README covers both projects. Existing docs and scripts
updated for the new paths; no docs/output/ file from the first article moved, so
links in the published article still resolve.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013f7f2XZXrQ6gW3RtZE187t
10 lines
451 B
Plaintext
10 lines
451 B
Plaintext
-----BEGIN PUBLIC KEY-----
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MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5NEDQPQW0Gz6iR5+UNl7
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J7660/Psd5q1f5VamK9KTS9f6YhPPIG8mfi6zWe8XmxxdR/Bd2yaX+v/Wz6MgeFL
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bBVkRFfve/zVnq4+kgjhn8UaRK1iU0C1j+7SahD73hHqGaOjAlFNro5ygjGAcVL8
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RGVMxRMy4aaTAm3KB4EdG2hJFxyfCBqtkwsHTM/DXcoFTLTZ2bI+hPhN6uBxk7yk
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FaCnQ47yrKSM6kn0ul0dp22AK/4mP1SRDnnr3Da5GFhMKtBqy/GgXcJ9WTpxIYhl
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r8B5modtb5S34900VPScpoXiJdUhghxEpXbb1W/PlpVIElISHzldnwWOogdPncO0
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zQIDAQAB
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-----END PUBLIC KEY-----
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