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
36 lines
1.3 KiB
Bash
Executable File
36 lines
1.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# The same resource server, the same code, a real Keycloak.
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# Requires: docker compose -f docker/compose.yaml up -d
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# ./scripts/run-rs.sh keycloak,roles
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set -eu
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. "$(dirname "$0")/lib.sh"
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head1 "Keycloak discovery document"
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curl -s "$KC/realms/demo/.well-known/openid-configuration" \
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| python3 -c 'import json,sys; d=json.load(sys.stdin); [print(" %-22s %s" % (k, d[k])) for k in ("issuer","jwks_uri","token_endpoint")]'
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head1 "Keycloak JWK Set"
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curl -s "$KC/realms/demo/protocol/openid-connect/certs" \
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| python3 -c '
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import json,sys
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d=json.load(sys.stdin)
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print(" keys published:", len(d["keys"]))
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for k in d["keys"]:
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print(" kid=%s alg=%s use=%s kty=%s" % (k.get("kid"), k.get("alg"), k.get("use"), k.get("kty")))'
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head1 "1. alice, password grant"
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T=$(kc_token alice alice-password)
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claims "$T"
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call "GET /api/me" "$RS/api/me" "$T"
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call "GET /api/reports (client role, from resource_access.reports-api.roles)" "$RS/api/reports" "$T"
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call "GET /api/admin/stats (realm role ADMIN, which alice does not have)" "$RS/api/admin/stats" "$T"
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head1 "2. root"
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T=$(kc_token root root-password)
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call "GET /api/admin/stats" "$RS/api/admin/stats" "$T"
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head1 "3. nobody - a user with no client role"
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T=$(kc_token nobody nobody-password)
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claims "$T"
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call "GET /api/reports" "$RS/api/reports" "$T"
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