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
37 lines
1.5 KiB
Bash
Executable File
37 lines
1.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Reproduces the "permitAll() endpoint still returns 403" failure.
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# Requires: --spring.profiles.active=hs256,csrfon
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set -u
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BASE="${1:-http://localhost:8080}"
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show() {
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local out
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out=$(curl -sS -D /tmp/.h -o /tmp/.b -w '%{http_code}' "$@")
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printf 'HTTP %s\n' "$out"
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grep -iE '^(www-authenticate|content-type):' /tmp/.h | sed 's/\r$//'
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[ -s /tmp/.b ] && { python3 -m json.tool < /tmp/.b 2>/dev/null || cat /tmp/.b; echo; }
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}
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hr(){ printf '\n%s\n' "--------------------------------------------------------------------------"; }
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echo "=========================================================================="
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echo " jwt-auth-demo - CSRF vs permitAll()"
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echo " app started with: --spring.profiles.active=hs256,csrfon"
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echo "=========================================================================="
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hr; echo "# A. The login endpoint is permitAll(). POST it anyway."
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echo "# 403 - and nothing in the authorization rules explains why."
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echo
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show -X POST "$BASE/api/auth/login" -H 'Content-Type: application/json' \
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-d '{"username":"alice","password":"alice-password"}'
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hr; echo "# B. GET on the same permitAll() path family works. Only unsafe methods break."
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echo
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show "$BASE/api/public/ping"
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hr; echo "# C. The filter chain, with CsrfFilter present. Count the positions:"
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echo "# CsrfFilter is 5th, AuthorizationFilter is last. The request never"
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echo "# reaches the filter that knows about permitAll()."
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echo
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show "$BASE/api/public/filters"
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hr; echo "# end"
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