merge: shared Google brokering baseline

# Conflicts: # .env.example
2026-07-25 16:18:16 +09:00
parent f8544d5bec 98566a713d
commit e682777fc5
18 changed files with 828 additions and 0 deletions
@@ -12,8 +12,15 @@ BFF_CLIENT_SECRET=change-me-bff-client-secret
 EDGE_PROXY_CLIENT_SECRET=change-me-edge-proxy-client-secret
 OAUTH2_PROXY_COOKIE_SECRET=generate-a-base64-encoded-32-byte-secret
 INTERNAL_AUTH_TOKEN=generate-a-long-random-edge-to-backend-token
+MOCK_GOOGLE_BROKER_CLIENT_SECRET=change-me-mock-google-broker-client-secret
 ADMIN_USER_PASSWORD=change-me-admin-user-password
 REGULAR_USER_PASSWORD=change-me-regular-user-password
+MOCK_GOOGLE_USER_PASSWORD=change-me-mock-google-user-password
+
+# Optional real-Google profile. These are consumed only by
+# scripts/configure-google-idp.sh and must never be committed with real values.
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=

 # Port 80 is the single-EC2 target. 8088 avoids common local port conflicts.
 NGINX_PORT=8088
@@ -7,3 +7,7 @@ backend/target/
 **/node_modules/
 frontend/dist/
 build/
+e2e/node_modules/
+google-e2e/node_modules/
+frontend/node_modules/
+frontend/dist/
@@ -1,5 +1,12 @@
 # Keycloak Authentication Patterns

+The 39-branch implementation registry is documented in
+[`docs/keycloak-branch-index.md`](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`](docs/google-idp-brokering.md).
+
 Keycloak을 중심으로 네 가지 브라우저 인증 통합 패턴을 같은 로컬
 인프라에서 비교하는 학습 프로젝트입니다.

@@ -38,8 +38,10 @@ services:
      TOKEN_MEDIATING_CLIENT_SECRET: ${TOKEN_MEDIATING_CLIENT_SECRET:?set TOKEN_MEDIATING_CLIENT_SECRET in .env}
      BFF_CLIENT_SECRET: ${BFF_CLIENT_SECRET:?set BFF_CLIENT_SECRET in .env}
      EDGE_PROXY_CLIENT_SECRET: ${EDGE_PROXY_CLIENT_SECRET:?set EDGE_PROXY_CLIENT_SECRET in .env}
+      MOCK_GOOGLE_BROKER_CLIENT_SECRET: ${MOCK_GOOGLE_BROKER_CLIENT_SECRET:?set MOCK_GOOGLE_BROKER_CLIENT_SECRET in .env}
      ADMIN_USER_PASSWORD: ${ADMIN_USER_PASSWORD:?set ADMIN_USER_PASSWORD in .env}
      REGULAR_USER_PASSWORD: ${REGULAR_USER_PASSWORD:?set REGULAR_USER_PASSWORD in .env}
+      MOCK_GOOGLE_USER_PASSWORD: ${MOCK_GOOGLE_USER_PASSWORD:?set MOCK_GOOGLE_USER_PASSWORD in .env}
    ports:
      - "127.0.0.1:8080:8080"
    volumes:
@@ -0,0 +1,27 @@
+# First Broker Login security
+
+Keycloak 26.7.0's built-in `first broker login` flow does **not** silently
+auto-link by email. It contains:
+
+- `Create User If Unique`
+- `Handle Existing Account`
+- `Confirm link existing account`
+- email verification or re-authentication ownership proof
+
+`Automatically set existing user` is an explicit, dangerous opt-in. The local
+acceptance harness copies the built-in flow, enables AutoLink, disables the
+ownership-proof branch, and signs in through a controllable OIDC account whose
+email collides with `regular-user`. It verifies that the external identity is
+attached without proof. The harness then assigns the original built-in flow,
+repeats the login, observes the existing-account confirmation page, and verifies
+that no federated identity was attached.
+
+Run after the stack is healthy:
+
+```bash
+./scripts/verify-first-broker-login.sh
+```
+
+The vulnerable flow remains only as a disabled learning artifact. The
+`mock-google` provider is always returned to the secure built-in flow at the end
+of the verification.
@@ -0,0 +1,28 @@
+# Google IdP brokering
+
+Keycloak is the only issuer trusted by AP1–AP4. Google is an upstream Identity
+Provider; applications do not receive or validate a Google token.
+
+## Two verification profiles
+
+The default local profile imports a second Keycloak realm named `mock-google`.
+It acts as a controllable OIDC provider and allows tests to choose claims such
+as a duplicate email, `email_verified=false`, `hd`, and `picture`. This is the
+safe way to reproduce an unsafe email auto-link without impersonating a real
+Google account.
+
+The real-Google profile is configured explicitly:
+
+1. Create a Google OAuth **Web application**.
+2. Register the exact redirect URI printed by
+   `./scripts/configure-google-idp.sh`.
+3. Put `GOOGLE_CLIENT_ID` and `GOOGLE_CLIENT_SECRET` in ignored `.env`.
+4. Start the stack and run the configuration script.
+
+The script writes `providerId=google`, `trustEmail=false`, minimal
+`openid profile email` scopes, and `syncMode=IMPORT` through the Keycloak Admin
+API. Credentials are never written to the realm export or repository.
+
+Google requires a public HTTPS redirect for non-local deployments. Local mock
+verification proves the Keycloak brokering boundary; a real Google login is a
+separate credentialed acceptance profile.
@@ -0,0 +1,29 @@
+# Keycloak branch implementation index
+
+The source inventory contains 39 `feature-keycloak-*.md` branch notes. This
+repository preserves one local Git feature branch for every note and merges it
+with `--no-ff` into either the common `develop` baseline or one of the four
+authentication-pattern branches.
+
+| Target | Meaning |
+|---|---|
+| `common` | Shared realm, federation, deployment, or governance contract. Merge into `develop`, then propagate to AP1–AP4. |
+| `ap1` | Browser-based OAuth client: vanilla SPA, Authorization Code + PKCE, Resource Server. |
+| `ap2` | Token-mediating confidential backend: browser receives access token only. |
+| `ap3` | BFF: backend owns every OAuth token and browser owns only a session cookie. |
+| `ap4` | Edge forward-auth: oauth2-proxy/Nginx owns login and backend trusts an isolated identity header. |
+
+The machine-readable registry is
+[`keycloak-branch-manifest.tsv`](keycloak-branch-manifest.tsv). Run:
+
+```bash
+./scripts/audit-keycloak-branches.sh
+```
+
+The audit succeeds only when all 39 note names have matching local feature
+branches and each feature tip is reachable from its declared target branch.
+
+Google credentials are never committed. The default local acceptance harness
+uses a second Keycloak realm as a controllable OIDC provider so claim mapping
+and unsafe-linking failure paths can be reproduced. A real Google login remains
+an explicit credentialed/public-HTTPS verification profile.
@@ -0,0 +1,40 @@
+branch	target	delivery
+feature/keycloak-account-linking-spa-ux	ap1	documented-and-contract-tested
+feature/keycloak-account-linking-sub-vs-email	common	documented-and-contract-tested
+feature/keycloak-bff-csrf-samesite-defense	ap3	locally-verified
+feature/keycloak-bff-oauth2login-session	ap3	locally-verified
+feature/keycloak-bff-vs-spa-direct	ap3	documented
+feature/keycloak-docker-compose-stack	common	locally-verified
+feature/keycloak-edge-forwardauth-google-federation	ap4	documented-and-config-tested
+feature/keycloak-edge-forwardauth-no-google	ap4	documented-and-config-tested
+feature/keycloak-federation-spa-zero-change	ap1	contract-tested
+feature/keycloak-first-broker-login-flow	common	locally-verified-with-mock-idp
+feature/keycloak-four-pattern-tradeoff-matrix	common	documented-and-evidence-linked
+feature/keycloak-google-claim-attribute-mapping	common	locally-verified-with-mock-idp
+feature/keycloak-google-redirect-uri-policy	common	config-tested
+feature/keycloak-header-spoofing-defense	ap4	locally-verified
+feature/keycloak-https-termination-caddy-nginx	common	config-tested
+feature/keycloak-idp-brokering-google-client	common	locally-verified-with-mock-idp
+feature/keycloak-idp-mappers-claim-to-role	common	locally-verified-with-mock-idp
+feature/keycloak-internal-spa-direct-google-federation	ap1	documented-and-contract-tested
+feature/keycloak-internal-spa-direct-no-google	ap1	documented-and-contract-tested
+feature/keycloak-iss-claim-hostname-mismatch	ap1	locally-verified
+feature/keycloak-nginx-auth-request-integration	ap4	locally-verified
+feature/keycloak-oauth2-proxy-oidc-flow	ap4	locally-verified
+feature/keycloak-patterns	common	governance
+feature/keycloak-pkce-flow-stages	ap1	contract-tested
+feature/keycloak-public-domain-tunneling	common	config-tested
+feature/keycloak-realm-client-export	common	locally-verified
+feature/keycloak-refresh-rotation-and-logout	ap1	locally-verified
+feature/keycloak-refresh-token-rotation	ap1	contract-tested
+feature/keycloak-reverse-proxy-headers	common	config-tested
+feature/keycloak-single-ec2-google-federation	ap1	documented-and-config-tested
+feature/keycloak-single-ec2-no-google	ap1	documented-and-contract-tested
+feature/keycloak-spa-token-storage-tradeoff	ap1	locally-verified
+feature/keycloak-spring-rs-audience-validator	ap1	locally-verified
+feature/keycloak-spring-rs-role-mapping	ap1	locally-verified
+feature/keycloak-three-leg-trust-chain	ap1	documented-and-contract-tested
+feature/keycloak-token-mediating-access-handoff	ap2	locally-verified
+feature/keycloak-token-mediating-confidential-client	ap2	locally-verified
+feature/keycloak-traefik-forwardauth-alternative	ap4	config-tested
+feature/keycloak-vanilla-js-spa-pkce	ap1	locally-verified
@@ -0,0 +1,124 @@
+import assert from "node:assert/strict";
+import { chromium } from "playwright-core";
+
+const expectation = process.env.FIRST_BROKER_EXPECTATION;
+assert.ok(
+  expectation === "vulnerable" || expectation === "secure",
+  "FIRST_BROKER_EXPECTATION must be vulnerable or secure",
+);
+
+const keycloakUrl = process.env.KEYCLOAK_URL ?? "http://localhost:8080";
+const adminUsername = process.env.KC_BOOTSTRAP_ADMIN_USERNAME;
+const adminPassword = process.env.KC_BOOTSTRAP_ADMIN_PASSWORD;
+const mockPassword = process.env.MOCK_GOOGLE_USER_PASSWORD;
+assert.ok(adminUsername && adminPassword && mockPassword);
+
+async function adminToken() {
+  const body = new URLSearchParams({
+    client_id: "admin-cli",
+    grant_type: "password",
+    username: adminUsername,
+    password: adminPassword,
+  });
+  const response = await fetch(
+    `${keycloakUrl}/realms/master/protocol/openid-connect/token`,
+    { method: "POST", body },
+  );
+  assert.equal(response.status, 200);
+  return (await response.json()).access_token;
+}
+
+async function regularUser(token) {
+  const response = await fetch(
+    `${keycloakUrl}/admin/realms/keycloak-patterns/users?username=regular-user&exact=true`,
+    { headers: { Authorization: `Bearer ${token}` } },
+  );
+  assert.equal(response.status, 200);
+  const users = await response.json();
+  assert.equal(users.length, 1);
+  return users[0];
+}
+
+async function federatedIdentities(token, userId) {
+  const response = await fetch(
+    `${keycloakUrl}/admin/realms/keycloak-patterns/users/${userId}/federated-identity`,
+    { headers: { Authorization: `Bearer ${token}` } },
+  );
+  assert.equal(response.status, 200);
+  return response.json();
+}
+
+async function removeMockLink(token, userId) {
+  const identities = await federatedIdentities(token, userId);
+  if (identities.some(({ identityProvider }) => identityProvider === "mock-google")) {
+    const response = await fetch(
+      `${keycloakUrl}/admin/realms/keycloak-patterns/users/${userId}/federated-identity/mock-google`,
+      {
+        method: "DELETE",
+        headers: { Authorization: `Bearer ${token}` },
+      },
+    );
+    assert.equal(response.status, 204);
+  }
+}
+
+const token = await adminToken();
+const user = await regularUser(token);
+await removeMockLink(token, user.id);
+
+const browser = await chromium.launch({
+  executablePath: process.env.CHROME_BIN ?? "/usr/bin/google-chrome",
+  headless: true,
+  args: ["--no-sandbox"],
+});
+
+try {
+  const context = await browser.newContext();
+  const page = await context.newPage();
+  const authorizationUrl = new URL(
+    `${keycloakUrl}/realms/keycloak-patterns/protocol/openid-connect/auth`,
+  );
+  authorizationUrl.search = new URLSearchParams({
+    client_id: "spa-public",
+    redirect_uri: "http://localhost:8088/",
+    response_type: "code",
+    scope: "openid profile email",
+    state: `first-broker-${expectation}`,
+    nonce: `nonce-${expectation}`,
+    code_challenge: "K2qUEfBl-nQvF2gB4dNxC2zYVwZc1CVnZb5CsX2L7fI",
+    code_challenge_method: "S256",
+    kc_idp_hint: "mock-google",
+  });
+
+  await page.goto(authorizationUrl.toString());
+  await page.waitForURL(/\/realms\/mock-google\//u);
+  await page.locator("#username").fill("mock-collision-user");
+  await page.locator("#password").fill(mockPassword);
+  await page.locator("#kc-login").click();
+  await page.waitForLoadState("domcontentloaded");
+
+  if (expectation === "vulnerable") {
+    await page.waitForURL(/localhost:8088\/\?.*code=/u);
+    const identities = await federatedIdentities(token, user.id);
+    assert.equal(
+      identities.some(({ identityProvider }) => identityProvider === "mock-google"),
+      true,
+      "unsafe AutoLink should attach the attacker-controlled identity",
+    );
+    await removeMockLink(token, user.id);
+  } else {
+    assert.match(page.url(), /\/realms\/keycloak-patterns\//u);
+    const body = (await page.locator("body").innerText()).toLowerCase();
+    assert.match(body, /account already exists|link existing account|existing account/u);
+    const identities = await federatedIdentities(token, user.id);
+    assert.equal(
+      identities.some(({ identityProvider }) => identityProvider === "mock-google"),
+      false,
+      "Confirm Link must not attach the identity without ownership proof",
+    );
+  }
+
+  console.log(`first broker login ${expectation} case verified`);
+} finally {
+  await browser.close();
+}
@@ -0,0 +1,27 @@
+{
+  "name": "keycloak-google-broker-e2e",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "keycloak-google-broker-e2e",
+      "version": "1.0.0",
+      "dependencies": {
+        "playwright-core": "1.55.1"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.55.1",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.55.1.tgz",
+      "integrity": "sha512-Z6Mh9mkwX+zxSlHqdr5AOcJnfp+xUWLCt9uKV18fhzA8eyxUd8NUWzAjxUh55RZKSYwDGX0cfaySdhZJGMoJ+w==",
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    }
+  }
+}
@@ -0,0 +1,12 @@
+{
+  "name": "keycloak-google-broker-e2e",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "test:first-broker": "node first-broker-login.mjs"
+  },
+  "dependencies": {
+    "playwright-core": "1.55.1"
+  }
+}
@@ -125,6 +125,36 @@
      }
    }
  ],
+  "identityProviders": [
+    {
+      "alias": "mock-google",
+      "displayName": "Mock Google (local verification)",
+      "providerId": "oidc",
+      "enabled": true,
+      "updateProfileFirstLoginMode": "off",
+      "trustEmail": false,
+      "storeToken": false,
+      "addReadTokenRoleOnCreate": false,
+      "authenticateByDefault": false,
+      "linkOnly": false,
+      "firstBrokerLoginFlowAlias": "first broker login",
+      "config": {
+        "clientId": "mock-google-broker",
+        "clientSecret": "${MOCK_GOOGLE_BROKER_CLIENT_SECRET}",
+        "authorizationUrl": "http://localhost:8080/realms/mock-google/protocol/openid-connect/auth",
+        "tokenUrl": "http://keycloak:8080/realms/mock-google/protocol/openid-connect/token",
+        "userInfoUrl": "http://keycloak:8080/realms/mock-google/protocol/openid-connect/userinfo",
+        "issuer": "http://localhost:8080/realms/mock-google",
+        "jwksUrl": "http://keycloak:8080/realms/mock-google/protocol/openid-connect/certs",
+        "useJwksUrl": "true",
+        "validateSignature": "true",
+        "defaultScope": "openid profile email",
+        "syncMode": "IMPORT",
+        "pkceEnabled": "true",
+        "pkceMethod": "S256"
+      }
+    }
+  ],
  "users": [
    {
      "username": "admin-user",
@@ -0,0 +1,71 @@
+{
+  "realm": "mock-google",
+  "displayName": "Controllable Google OIDC Test Provider",
+  "enabled": true,
+  "sslRequired": "external",
+  "registrationAllowed": false,
+  "resetPasswordAllowed": false,
+  "editUsernameAllowed": false,
+  "loginWithEmailAllowed": true,
+  "duplicateEmailsAllowed": false,
+  "bruteForceProtected": true,
+  "clients": [
+    {
+      "clientId": "mock-google-broker",
+      "name": "Main Realm Identity Broker",
+      "enabled": true,
+      "protocol": "openid-connect",
+      "publicClient": false,
+      "clientAuthenticatorType": "client-secret",
+      "secret": "${MOCK_GOOGLE_BROKER_CLIENT_SECRET}",
+      "standardFlowEnabled": true,
+      "implicitFlowEnabled": false,
+      "directAccessGrantsEnabled": false,
+      "serviceAccountsEnabled": false,
+      "redirectUris": [
+        "http://localhost:8080/realms/keycloak-patterns/broker/mock-google/endpoint"
+      ],
+      "webOrigins": []
+    }
+  ],
+  "users": [
+    {
+      "username": "mock-new-user",
+      "enabled": true,
+      "email": "broker-new-user@example.test",
+      "emailVerified": true,
+      "firstName": "Broker",
+      "lastName": "New",
+      "credentials": [
+        {
+          "type": "password",
+          "value": "${MOCK_GOOGLE_USER_PASSWORD}",
+          "temporary": false
+        }
+      ]
+    },
+    {
+      "username": "mock-collision-user",
+      "enabled": true,
+      "email": "regular-user@example.test",
+      "emailVerified": false,
+      "firstName": "Broker",
+      "lastName": "Collision",
+      "attributes": {
+        "hd": [
+          "example.test"
+        ],
+        "picture": [
+          "https://images.example.test/mock-collision-user.png"
+        ]
+      },
+      "credentials": [
+        {
+          "type": "password",
+          "value": "${MOCK_GOOGLE_USER_PASSWORD}",
+          "temporary": false
+        }
+      ]
+    }
+  ]
+}
@@ -0,0 +1,62 @@
+#!/usr/bin/env sh
+set -eu
+
+manifest="${1:-docs/keycloak-branch-manifest.tsv}"
+notes_dir="${KEYCLOAK_BRANCH_NOTES_DIR:-/home/donghyeon/workspace/ai-tools/llm-wiki/raw/branch-notes}"
+
+expected_count="$(awk 'NR > 1 { count += 1 } END { print count + 0 }' "$manifest")"
+if [ "$expected_count" -ne 39 ]; then
+  echo "manifest must contain exactly 39 Keycloak branches; found $expected_count" >&2
+  exit 1
+fi
+
+note_count="$(find "$notes_dir" -maxdepth 1 -type f -name 'feature-keycloak-*.md' | wc -l)"
+if [ "$note_count" -ne 39 ]; then
+  echo "branch-note inventory must contain exactly 39 files; found $note_count" >&2
+  exit 1
+fi
+
+missing=0
+unmerged=0
+tab="$(printf '\t')"
+
+while IFS="$tab" read -r branch target delivery; do
+  [ "$branch" = "branch" ] && continue
+
+  note_name="$(printf '%s\n' "$branch" |
+    sed 's#^feature/keycloak-#feature-keycloak-#').md"
+  if [ ! -f "$notes_dir/$note_name" ]; then
+    echo "missing branch note: $note_name" >&2
+    missing=$((missing + 1))
+  fi
+
+  if ! git show-ref --verify --quiet "refs/heads/$branch"; then
+    echo "missing local branch: $branch" >&2
+    missing=$((missing + 1))
+    continue
+  fi
+
+  case "$target" in
+    common) target_branch="develop" ;;
+    ap1) target_branch="develop-keycloak-pattern1" ;;
+    ap2) target_branch="develop-keycloak-pattern2" ;;
+    ap3) target_branch="develop-keycloak-pattern3" ;;
+    ap4) target_branch="develop-keycloak-pattern4" ;;
+    *)
+      echo "unknown target '$target' for $branch ($delivery)" >&2
+      exit 1
+      ;;
+  esac
+
+  if ! git merge-base --is-ancestor "$branch" "$target_branch"; then
+    echo "feature tip is not merged: $branch -> $target_branch" >&2
+    unmerged=$((unmerged + 1))
+  fi
+done < "$manifest"
+
+if [ "$missing" -ne 0 ] || [ "$unmerged" -ne 0 ]; then
+  echo "Keycloak branch audit failed: missing=$missing unmerged=$unmerged" >&2
+  exit 1
+fi
+
+echo "Keycloak branch audit passed: 39/39 branches exist and are merged"
@@ -0,0 +1,81 @@
+#!/usr/bin/env sh
+set -eu
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+: "${KC_BOOTSTRAP_ADMIN_USERNAME:?set KC_BOOTSTRAP_ADMIN_USERNAME in .env}"
+: "${KC_BOOTSTRAP_ADMIN_PASSWORD:?set KC_BOOTSTRAP_ADMIN_PASSWORD in .env}"
+: "${GOOGLE_CLIENT_ID:?set GOOGLE_CLIENT_ID in .env}"
+: "${GOOGLE_CLIENT_SECRET:?set GOOGLE_CLIENT_SECRET in .env}"
+
+keycloak_url="${KEYCLOAK_URL:-http://localhost:8080}"
+realm="${KEYCLOAK_REALM:-keycloak-patterns}"
+
+admin_token="$(
+  curl -fsS \
+    -d client_id=admin-cli \
+    -d grant_type=password \
+    -d "username=$KC_BOOTSTRAP_ADMIN_USERNAME" \
+    -d "password=$KC_BOOTSTRAP_ADMIN_PASSWORD" \
+    "$keycloak_url/realms/master/protocol/openid-connect/token" |
+    jq -er .access_token
+)"
+
+payload="$(
+  jq -n \
+    --arg client_id "$GOOGLE_CLIENT_ID" \
+    --arg client_secret "$GOOGLE_CLIENT_SECRET" \
+    '{
+      alias: "google",
+      displayName: "Sign in with Google",
+      providerId: "google",
+      enabled: true,
+      updateProfileFirstLoginMode: "off",
+      trustEmail: false,
+      storeToken: false,
+      addReadTokenRoleOnCreate: false,
+      authenticateByDefault: false,
+      linkOnly: false,
+      firstBrokerLoginFlowAlias: "first broker login",
+      config: {
+        clientId: $client_id,
+        clientSecret: $client_secret,
+        defaultScope: "openid profile email",
+        syncMode: "IMPORT"
+      }
+    }'
+)"
+
+endpoint="$keycloak_url/admin/realms/$realm/identity-provider/instances"
+status="$(
+  curl -sS -o /dev/null -w '%{http_code}' \
+    -H "Authorization: Bearer $admin_token" \
+    "$endpoint/google"
+)"
+
+if [ "$status" = "200" ]; then
+  curl -fsS -X PUT \
+    -H "Authorization: Bearer $admin_token" \
+    -H "Content-Type: application/json" \
+    --data "$payload" \
+    "$endpoint/google"
+  action="updated"
+else
+  curl -fsS -X POST \
+    -H "Authorization: Bearer $admin_token" \
+    -H "Content-Type: application/json" \
+    --data "$payload" \
+    "$endpoint"
+  action="created"
+fi
+
+echo "Google Identity Provider $action for realm '$realm'"
+echo "Register this exact Google redirect URI:"
+echo "$keycloak_url/realms/$realm/broker/google/endpoint"
@@ -0,0 +1,178 @@
+#!/usr/bin/env sh
+set -eu
+
+mode="${1:-}"
+case "$mode" in
+  vulnerable|secure) ;;
+  *)
+    echo "usage: $0 vulnerable|secure" >&2
+    exit 1
+    ;;
+esac
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+keycloak_url="${KEYCLOAK_URL:-http://localhost:8080}"
+realm="${KEYCLOAK_REALM:-keycloak-patterns}"
+admin_base="$keycloak_url/admin/realms/$realm"
+vulnerable_flow="vulnerable first broker login"
+idp_url="$admin_base/identity-provider/instances/mock-google"
+
+admin_token="$(
+  curl -fsS \
+    -d client_id=admin-cli \
+    -d grant_type=password \
+    -d "username=$KC_BOOTSTRAP_ADMIN_USERNAME" \
+    -d "password=$KC_BOOTSTRAP_ADMIN_PASSWORD" \
+    "$keycloak_url/realms/master/protocol/openid-connect/token" |
+    jq -er .access_token
+)"
+
+auth_header="Authorization: Bearer $admin_token"
+encode() {
+  jq -rn --arg value "$1" '$value | @uri'
+}
+
+flows="$(curl -fsS -H "$auth_header" "$admin_base/authentication/flows")"
+flow_id="$(
+  printf '%s' "$flows" |
+    jq -r --arg alias "$vulnerable_flow" '
+      .[] | select(.alias == $alias) | .id
+    ' |
+    head -1
+)"
+
+if [ -n "$flow_id" ]; then
+  existing_executions="$(
+    curl -fsS -H "$auth_header" \
+      "$admin_base/authentication/flows/$(encode "$vulnerable_flow")/executions"
+  )"
+  if printf '%s' "$existing_executions" | jq -e '
+    any(.[]; .authenticationFlow == true)
+  ' >/dev/null; then
+    idp_before_delete="$(curl -fsS -H "$auth_header" "$idp_url")"
+    printf '%s' "$idp_before_delete" |
+      jq '.firstBrokerLoginFlowAlias = "first broker login"' |
+      curl -fsS -X PUT \
+        -H "$auth_header" \
+        -H "Content-Type: application/json" \
+        --data @- \
+        "$idp_url"
+    curl -fsS -X DELETE \
+      -H "$auth_header" \
+      "$admin_base/authentication/flows/$flow_id"
+    flow_id=""
+  fi
+fi
+
+if [ -z "$flow_id" ]; then
+  curl -fsS -X POST \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data "$(
+      jq -n --arg alias "$vulnerable_flow" '{
+        alias: $alias,
+        description: "INSECURE LEARNING FLOW - automatic email linking",
+        providerId: "basic-flow",
+        topLevel: true,
+        builtIn: false
+      }'
+    )" \
+    "$admin_base/authentication/flows"
+fi
+
+executions_url="$admin_base/authentication/flows/$(encode "$vulnerable_flow")/executions"
+executions="$(curl -fsS -H "$auth_header" "$executions_url")"
+create_user_id="$(
+  printf '%s' "$executions" |
+    jq -r '.[] | select(.providerId == "idp-create-user-if-unique") | .id' |
+    head -1
+)"
+if [ -z "$create_user_id" ]; then
+  curl -fsS -X POST \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data '{"provider":"idp-create-user-if-unique"}' \
+    "$admin_base/authentication/flows/$(encode "$vulnerable_flow")/executions/execution"
+  executions="$(curl -fsS -H "$auth_header" "$executions_url")"
+  create_user_id="$(
+    printf '%s' "$executions" |
+      jq -r '.[] | select(.providerId == "idp-create-user-if-unique") | .id' |
+      head -1
+  )"
+fi
+
+auto_link_id="$(
+  printf '%s' "$executions" |
+    jq -r '.[] | select(.providerId == "idp-auto-link") | .id' |
+    head -1
+)"
+
+if [ -z "$auto_link_id" ]; then
+  curl -fsS -X POST \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data '{"provider":"idp-auto-link"}' \
+    "$admin_base/authentication/flows/$(encode "$vulnerable_flow")/executions/execution"
+  executions="$(curl -fsS -H "$auth_header" "$executions_url")"
+  auto_link_id="$(
+    printf '%s' "$executions" |
+      jq -r '.[] | select(.providerId == "idp-auto-link") | .id' |
+      head -1
+  )"
+fi
+
+if [ "$mode" = "vulnerable" ]; then
+  curl -fsS -X PUT \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data "$(jq -n --arg id "$create_user_id" '{id: $id, requirement: "ALTERNATIVE"}')" \
+    "$executions_url"
+  curl -fsS -X PUT \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data "$(jq -n --arg id "$auto_link_id" '{id: $id, requirement: "ALTERNATIVE"}')" \
+    "$executions_url"
+  selected_flow="$vulnerable_flow"
+else
+  selected_flow="first broker login"
+fi
+
+idp="$(curl -fsS -H "$auth_header" "$idp_url")"
+printf '%s' "$idp" |
+  jq --arg flow "$selected_flow" '.firstBrokerLoginFlowAlias = $flow' |
+  curl -fsS -X PUT \
+    -H "$auth_header" \
+    -H "Content-Type: application/json" \
+    --data @- \
+    "$idp_url"
+
+assigned="$(
+  curl -fsS -H "$auth_header" "$idp_url" |
+    jq -r .firstBrokerLoginFlowAlias
+)"
+test "$assigned" = "$selected_flow"
+
+if [ "$mode" = "secure" ]; then
+  secure_executions="$(
+    curl -fsS -H "$auth_header" \
+      "$admin_base/authentication/flows/$(encode "first broker login")/executions"
+  )"
+  printf '%s' "$secure_executions" | jq -e '
+    any(.[];
+      .providerId == "idp-confirm-link" and .requirement == "REQUIRED"
+    ) and
+    (any(.[];
+      .providerId == "idp-auto-link" and .requirement != "DISABLED"
+    ) | not)
+  ' >/dev/null
+fi
+
+echo "mock-google First Broker Login mode: $mode ($selected_flow)"
@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+set -eu
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+restore_secure_flow() {
+  ./scripts/set-first-broker-login-mode.sh secure >/dev/null 2>&1 || true
+}
+trap restore_secure_flow 0 1 2 15
+
+npm --prefix google-e2e ci
+
+./scripts/set-first-broker-login-mode.sh vulnerable
+FIRST_BROKER_EXPECTATION=vulnerable \
+  npm --prefix google-e2e run test:first-broker
+
+./scripts/set-first-broker-login-mode.sh secure
+FIRST_BROKER_EXPECTATION=secure \
+  npm --prefix google-e2e run test:first-broker
+
+trap - 0 1 2 15
+echo "First Broker Login verified: unsafe AutoLink reproduced, Confirm Link restored"
@@ -0,0 +1,70 @@
+#!/usr/bin/env sh
+set -eu
+
+if [ ! -f .env ]; then
+  echo "missing .env" >&2
+  exit 1
+fi
+
+set -a
+. ./.env
+set +a
+
+keycloak_url="${KEYCLOAK_URL:-http://localhost:8080}"
+
+admin_token="$(
+  curl -fsS \
+    -d client_id=admin-cli \
+    -d grant_type=password \
+    -d "username=$KC_BOOTSTRAP_ADMIN_USERNAME" \
+    -d "password=$KC_BOOTSTRAP_ADMIN_PASSWORD" \
+    "$keycloak_url/realms/master/protocol/openid-connect/token" |
+    jq -er .access_token
+)"
+
+idp="$(
+  curl -fsS \
+    -H "Authorization: Bearer $admin_token" \
+    "$keycloak_url/admin/realms/keycloak-patterns/identity-provider/instances/mock-google"
+)"
+
+printf '%s' "$idp" | jq -e '
+  .providerId == "oidc" and
+  .enabled == true and
+  .trustEmail == false and
+  .config.clientId == "mock-google-broker" and
+  .config.defaultScope == "openid profile email" and
+  .config.syncMode == "IMPORT" and
+  .config.validateSignature == "true"
+' >/dev/null
+
+client="$(
+  curl -fsS \
+    -H "Authorization: Bearer $admin_token" \
+    "$keycloak_url/admin/realms/mock-google/clients?clientId=mock-google-broker"
+)"
+
+printf '%s' "$client" | jq -e '
+  length == 1 and
+  .[0].publicClient == false and
+  (.[0].redirectUris | index(
+    "http://localhost:8080/realms/keycloak-patterns/broker/mock-google/endpoint"
+  )) != null
+' >/dev/null
+
+location="$(
+  curl -sS -D - -o /dev/null \
+    "$keycloak_url/realms/keycloak-patterns/protocol/openid-connect/auth?client_id=spa-public&redirect_uri=http%3A%2F%2Flocalhost%3A8088%2F&response_type=code&scope=openid&code_challenge=K2qUEfBl-nQvF2gB4dNxC2zYVwZc1CVnZb5CsX2L7fI&code_challenge_method=S256&kc_idp_hint=mock-google" |
+    awk 'BEGIN { IGNORECASE=1 } /^Location:/ { print $2 }' |
+    tr -d '\r'
+)"
+
+case "$location" in
+  "$keycloak_url/realms/keycloak-patterns/broker/mock-google/login"*) ;;
+  *)
+    echo "broker did not redirect to the controllable OIDC provider: $location" >&2
+    exit 1
+    ;;
+esac
+
+echo "Google broker contract verified with the local mock OIDC realm"