DongHyeonkaandClaude Opus 5 6f6ab86345 docs(guides): reproduction guides for all 26 experiments
Written by subagents running under the writing-practitioner-guides skill,
one guide per experiment, 22,566 lines. Each walks a reader from baseline
capture through injection, injection verification, observation and recovery.

Section 3 carries the weight in most of them. Injection failed silently nine
times in this lab, and a failed injection looks exactly like no effect — so
the guides verify the target is actually in the intended state before
reading any result. A-4 makes virsh list the only proof because the node
reads Ready for 40 seconds after the machine is off; A-5 makes the packet
counter the sole go/no-go because a rule on the wrong node produces an empty
result that reads like a finding; A-6 quotes the run where 적용완료 was
printed between four Cannot find device "eth0" lines.

The traps the guides are built around are ones that invert a conclusion
rather than merely annoy:

  A-0   emptying the session table without a restart leaves cache entries
        that get counted as replication arriving
  A-2   dropping -o /dev/null fuses body and status into one string
  A-3   presence of "ready to accept connections" instead of its timestamp
  B-2   row count alone reads an UPDATE as nothing having happened
  B-4   tr ',' '\n' splits ["admin","editor"] so only admin is seen
  B-7   no login screen means the cookie died and SSO re-authenticated
  C-1   counting sessions without joining realm counts your own kcadm one
  D-1   kubectl exec without -i restores nothing and still exits 0
  D-4a  "ran with error output" is what success looks like

Every quoted block is copied from docs/evidence/ and marked 실측; reshaped
commands are marked 미검증 rather than passed off as measured. Where a source
document carries a ★ correction the guides follow the corrected claim — A-7's
REVOKED_TOKEN hypothesis, C-1's session count, B-2's schema attribution.

Two hazards are stated rather than smoothed over: B-6 deletes a key that
cannot be recreated, and D-1/D-4 need host sudo, which asks for a password,
so those steps say a person must type them.

Audit over all 26: 672 interpretation pairs, 486 evidence citations, 117
undo sections, and zero occurrences of the patterns the skill forbids —
no python data processing, no deprecated kubectl get endpoints, no
placeholders, no bare kcadm.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-07 18:29:00 +09:00
2026-09-03 11:46:56 +09:00

Keycloak Authentication Patterns

The 39-branch implementation registry is documented in docs/keycloak-branch-index.md.

Google brokering has a credential-free local OIDC harness and an opt-in real-Google profile described in docs/google-idp-brokering.md.

Keycloak을 중심으로 네 가지 브라우저 인증 통합 패턴을 같은 로컬 인프라에서 비교하는 학습 프로젝트입니다.

  • AP1: Browser-based OAuth Client (SPA direct + Resource Server)
  • AP2: Token-Mediating Backend
  • AP3: Backend-for-Frontend (BFF)
  • AP4: Edge forward-auth

세션 저장소·refresh token 경쟁·장애 복구는 네 패턴을 가로지르는 별도 축으로 develop-keycloak-session-store 브랜치에서 진행합니다. 계획과 진행 상황은 docs/session-store-lab-roadmap.md에 있습니다.

현재 develop의 공통 baseline은 Keycloak, PostgreSQL, Spring Boot API, nginx를 Docker Compose로 실행하는 토대입니다. 패턴별 구현은 이 baseline 위에서 별도 브랜치로 진행합니다.

요구 사항

  • Docker Engine
  • Docker Compose
  • curl

로컬 Java나 Maven은 필요하지 않습니다. Spring Boot 빌드와 테스트는 Maven 컨테이너에서 수행합니다.

시작

cp .env.example .env
docker compose up --build -d
./scripts/verify-stack.sh

기본 주소는 다음과 같습니다.

구성 요소 주소
Keycloak http://localhost:8080
Spring Boot API http://localhost:8081
nginx http://localhost:8088

host의 80번 포트를 쓸 수 있는 single-EC2 환경에서는 .envNGINX_PORT=80으로 변경할 수 있습니다.

상태 확인

docker compose ps
docker compose logs -f keycloak
curl http://localhost:8088/api/public
curl -i http://localhost:8088/api/me

/api/public200, 인증 정보가 없는 /api/me401이 정상입니다.

환경 초기화

PostgreSQL과 Keycloak data volume을 제거하고 realm import부터 다시 검증하려면 다음 한 줄을 사용합니다.

docker compose down -v && docker compose up --build -d

start-dev와 로컬 HTTP 설정은 학습 전용입니다. 운영 환경에서는 optimized Keycloak image, HTTPS, 엄격한 hostname 및 외부 secret store를 사용해야 합니다.

Realm baseline

keycloak/import/keycloak-patterns-realm.json은 시작 시 자동 import됩니다. 하나의 keycloak-patterns realm 안에서 패턴마다 client를 분리합니다.

Client 유형 패턴
spa-public public + PKCE S256 AP1
token-mediating-confidential confidential AP2
bff-confidential confidential AP3
edge-proxy confidential AP4

confidential client secret과 테스트 사용자 password는 JSON에 평문으로 저장하지 않습니다. JSON에는 ${ENVIRONMENT_VARIABLE} placeholder만 커밋하고, Keycloak 26.7.0이 import 시 .env 값을 주입합니다.

python3 scripts/validate-realm.py
docker compose down -v
docker compose up -d --wait
./scripts/verify-realm.sh

실행 중인 DB에서 CLI realm export를 재현하려면 다음 명령을 사용합니다. Keycloak을 잠시 중지하고 export한 뒤 자동으로 다시 올립니다.

./scripts/export-realm.sh

runtime export에는 실제 client secret과 credential hash가 포함될 수 있어 gitignored build/keycloak-export/에 권한 0600으로만 저장됩니다.

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