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
15 lines
720 B
Bash
Executable File
15 lines
720 B
Bash
Executable File
#!/usr/bin/env bash
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# Starts the stub authorization server on :9000, replacing any previous instance.
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set -eu
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cd "$(dirname "$0")/.."
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for p in $(ps -eo pid,cmd | grep '[S]tubIssuerApplication' | awk '{print $1}'); do kill -9 "$p" || true; done
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sleep 1
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setsid nohup mvn -B -o org.springframework.boot:spring-boot-maven-plugin:run \
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-Dspring-boot.run.main-class=com.ankurm.stubissuer.StubIssuerApplication \
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-Dspring-boot.run.profiles=stubissuer > /tmp/stub-issuer.log 2>&1 < /dev/null &
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for i in $(seq 1 60); do
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curl -sf http://localhost:9000/admin/state -o /dev/null 2>/dev/null && { echo "stub issuer up on :9000"; exit 0; }
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sleep 2
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done
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echo "stub issuer failed to start; see /tmp/stub-issuer.log" >&2; exit 1
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