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Add OAuth2 resource server project: JWT validation, JWKS and key rotation

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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
This commit is contained in:
Ankur Mhatre
2026-08-23 11:00:56 +00:00
parent 4a8dab6739
commit 4dc45d5e00
101 changed files with 4087 additions and 64 deletions
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jwt-authentication/src/main/resources/demo-public-key.pem Normal file
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-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5NEDQPQW0Gz6iR5+UNl7
J7660/Psd5q1f5VamK9KTS9f6YhPPIG8mfi6zWe8XmxxdR/Bd2yaX+v/Wz6MgeFL
bBVkRFfve/zVnq4+kgjhn8UaRK1iU0C1j+7SahD73hHqGaOjAlFNro5ygjGAcVL8
RGVMxRMy4aaTAm3KB4EdG2hJFxyfCBqtkwsHTM/DXcoFTLTZ2bI+hPhN6uBxk7yk
FaCnQ47yrKSM6kn0ul0dp22AK/4mP1SRDnnr3Da5GFhMKtBqy/GgXcJ9WTpxIYhl
r8B5modtb5S34900VPScpoXiJdUhghxEpXbb1W/PlpVIElISHzldnwWOogdPncO0
zQIDAQAB
-----END PUBLIC KEY-----