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
21 lines
878 B
Bash
Executable File
21 lines
878 B
Bash
Executable File
#!/usr/bin/env bash
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# What a token is allowed to do, and why Keycloak's roles are invisible by default.
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# Pass the profile set the resource server is running with, for the transcript header.
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set -eu
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. "$(dirname "$0")/lib.sh"
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PROFILES="${1:-unknown}"
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head1 "resource server profiles: $PROFILES"
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head1 "1. alice - realm role USER, client role reports-reader"
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T=$(stub_token "sub=alice&roles=USER")
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claims "$T"
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call "GET /api/me (which authorities did the converter produce?)" "$RS/api/me" "$T"
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call "GET /api/reports (needs ROLE_reports-reader, from resource_access)" "$RS/api/reports" "$T"
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call "GET /api/admin/stats (needs ROLE_ADMIN, from realm_access)" "$RS/api/admin/stats" "$T"
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head1 "2. root - realm roles USER and ADMIN"
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T=$(stub_token "sub=root&roles=USER%20ADMIN")
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call "GET /api/me" "$RS/api/me" "$T"
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call "GET /api/admin/stats" "$RS/api/admin/stats" "$T"
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