feat: migrate JWT verification from HS256 shared secret to JWKS

Replace symmetric HS256 JWT verification with asymmetric RS256 using JWKS. Backend now fetches and caches public keys from Supabase's JWKS endpoint instead of using a shared secret. - Add cryptography dependency for RS256 support - Use PyJWKClient to fetch/cache JWKS from {SUPABASE_URL}/.well-known/jwks.json - Remove SUPABASE_JWT_SECRET from config, docker-compose, deploy workflow, .env - Update tests to use RS256 tokens with mocked JWKS client Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-21 14:01:31 +01:00
parent 79ad7b9133
commit e9eccc5b21
11 changed files with 226 additions and 140 deletions
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -8,7 +8,6 @@ API_V1_PREFIX="/api/v1"
 # Database settings
 DATABASE_URL="sqlite:///./nuzlocke.db"

-# Supabase Auth
+# Supabase Auth (JWKS used for JWT verification)
 SUPABASE_URL=https://your-project.supabase.co
 SUPABASE_ANON_KEY=your-anon-key
-SUPABASE_JWT_SECRET=your-jwt-secret
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -14,6 +14,7 @@ dependencies = [
    "asyncpg==0.31.0",
    "alembic==1.18.4",
    "PyJWT==2.12.1",
+    "cryptography==45.0.3",
 ]

 [project.optional-dependencies]
--- a/backend/src/app/core/auth.py
+++ b/backend/src/app/core/auth.py
@@ -3,6 +3,7 @@ from uuid import UUID

 import jwt
 from fastapi import Depends, HTTPException, Request, status
+from jwt import PyJWKClient, PyJWKClientError
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession

@@ -11,6 +12,8 @@ from app.core.database import get_session
 from app.models.nuzlocke_run import NuzlockeRun
 from app.models.user import User

+_jwks_client: PyJWKClient | None = None
+

@dataclass
 class AuthUser:
@@ -21,6 +24,15 @@ class AuthUser:
    role: str | None = None


+def _get_jwks_client() -> PyJWKClient | None:
+    """Get or create a cached JWKS client."""
+    global _jwks_client
+    if _jwks_client is None and settings.supabase_url:
+        jwks_url = f"{settings.supabase_url.rstrip('/')}/.well-known/jwks.json"
+        _jwks_client = PyJWKClient(jwks_url, cache_jwk_set=True, lifespan=300)
+    return _jwks_client
+
+
 def _extract_token(request: Request) -> str | None:
    """Extract Bearer token from Authorization header."""
    auth_header = request.headers.get("Authorization")
@@ -33,14 +45,16 @@ def _extract_token(request: Request) -> str | None:


 def _verify_jwt(token: str) -> dict | None:
-    """Verify JWT against Supabase JWT secret. Returns payload or None."""
-    if not settings.supabase_jwt_secret:
+    """Verify JWT using JWKS public key. Returns payload or None."""
+    client = _get_jwks_client()
+    if not client:
        return None
    try:
+        signing_key = client.get_signing_key_from_jwt(token)
        payload = jwt.decode(
            token,
-            settings.supabase_jwt_secret,
-            algorithms=["HS256"],
+            signing_key.key,
+            algorithms=["RS256"],
            audience="authenticated",
        )
        return payload
@@ -48,6 +62,8 @@ def _verify_jwt(token: str) -> dict | None:
        return None
    except jwt.InvalidTokenError:
        return None
+    except PyJWKClientError:
+        return None


 def get_current_user(request: Request) -> AuthUser | None:
--- a/backend/src/app/core/config.py
+++ b/backend/src/app/core/config.py
@@ -20,7 +20,6 @@ class Settings(BaseSettings):
    # Supabase Auth
    supabase_url: str | None = None
    supabase_anon_key: str | None = None
-    supabase_jwt_secret: str | None = None


 settings = Settings()
--- a/backend/tests/test_auth.py
+++ b/backend/tests/test_auth.py
@@ -1,25 +1,29 @@
 import time
+from unittest.mock import MagicMock, patch
 from uuid import UUID

 import jwt
 import pytest
+from cryptography.hazmat.primitives.asymmetric import rsa
 from httpx import ASGITransport, AsyncClient

 from app.core.auth import AuthUser, get_current_user, require_admin, require_auth
-from app.core.config import settings
 from app.main import app
 from app.models.user import User


-@pytest.fixture
-def jwt_secret():
-    """Provide a test JWT secret."""
-    return "test-jwt-secret-for-testing-only"
+@pytest.fixture(scope="module")
+def rsa_key_pair():
+    """Generate RSA key pair for testing."""
+    private_key = rsa.generate_private_key(public_exponent=65537, key_size=2048)
+    public_key = private_key.public_key()
+    return private_key, public_key


@pytest.fixture
-def valid_token(jwt_secret):
-    """Generate a valid JWT token."""
+def valid_token(rsa_key_pair):
+    """Generate a valid RS256 JWT token."""
+    private_key, _ = rsa_key_pair
    payload = {
        "sub": "user-123",
        "email": "test@example.com",
@@ -27,12 +31,13 @@ def valid_token(jwt_secret):
        "aud": "authenticated",
        "exp": int(time.time()) + 3600,
    }
-    return jwt.encode(payload, jwt_secret, algorithm="HS256")
+    return jwt.encode(payload, private_key, algorithm="RS256")


@pytest.fixture
-def expired_token(jwt_secret):
-    """Generate an expired JWT token."""
+def expired_token(rsa_key_pair):
+    """Generate an expired RS256 JWT token."""
+    private_key, _ = rsa_key_pair
    payload = {
        "sub": "user-123",
        "email": "test@example.com",
@@ -40,12 +45,13 @@ def expired_token(jwt_secret):
        "aud": "authenticated",
        "exp": int(time.time()) - 3600,  # Expired 1 hour ago
    }
-    return jwt.encode(payload, jwt_secret, algorithm="HS256")
+    return jwt.encode(payload, private_key, algorithm="RS256")


@pytest.fixture
 def invalid_token():
-    """Generate a token signed with wrong secret."""
+    """Generate a token signed with wrong key."""
+    wrong_key = rsa.generate_private_key(public_exponent=65537, key_size=2048)
    payload = {
        "sub": "user-123",
        "email": "test@example.com",
@@ -53,81 +59,76 @@ def invalid_token():
        "aud": "authenticated",
        "exp": int(time.time()) + 3600,
    }
-    return jwt.encode(payload, "wrong-secret", algorithm="HS256")
+    return jwt.encode(payload, wrong_key, algorithm="RS256")


@pytest.fixture
-def auth_client(db_session, jwt_secret, valid_token, monkeypatch):
-    """Client with valid auth token and configured JWT secret."""
-    monkeypatch.setattr(settings, "supabase_jwt_secret", jwt_secret)
-
-    async def _get_client():
-        async with AsyncClient(
-            transport=ASGITransport(app=app),
-            base_url="http://test",
-            headers={"Authorization": f"Bearer {valid_token}"},
-        ) as ac:
-            yield ac
-
-    return _get_client
+def mock_jwks_client(rsa_key_pair):
+    """Create a mock JWKS client that returns our test public key."""
+    _, public_key = rsa_key_pair
+    mock_client = MagicMock()
+    mock_signing_key = MagicMock()
+    mock_signing_key.key = public_key
+    mock_client.get_signing_key_from_jwt.return_value = mock_signing_key
+    return mock_client


-async def test_get_current_user_valid_token(jwt_secret, valid_token, monkeypatch):
+async def test_get_current_user_valid_token(valid_token, mock_jwks_client):
    """Test get_current_user returns user for valid token."""
-    monkeypatch.setattr(settings, "supabase_jwt_secret", jwt_secret)
+    with patch("app.core.auth._get_jwks_client", return_value=mock_jwks_client):

-    class MockRequest:
-        headers = {"Authorization": f"Bearer {valid_token}"}
+        class MockRequest:
+            headers = {"Authorization": f"Bearer {valid_token}"}

-    user = get_current_user(MockRequest())
-    assert user is not None
-    assert user.id == "user-123"
-    assert user.email == "test@example.com"
-    assert user.role == "authenticated"
+        user = get_current_user(MockRequest())
+        assert user is not None
+        assert user.id == "user-123"
+        assert user.email == "test@example.com"
+        assert user.role == "authenticated"


-async def test_get_current_user_no_token(jwt_secret, monkeypatch):
+async def test_get_current_user_no_token(mock_jwks_client):
    """Test get_current_user returns None when no token."""
-    monkeypatch.setattr(settings, "supabase_jwt_secret", jwt_secret)
+    with patch("app.core.auth._get_jwks_client", return_value=mock_jwks_client):

-    class MockRequest:
-        headers = {}
+        class MockRequest:
+            headers = {}

-    user = get_current_user(MockRequest())
-    assert user is None
+        user = get_current_user(MockRequest())
+        assert user is None


-async def test_get_current_user_expired_token(jwt_secret, expired_token, monkeypatch):
+async def test_get_current_user_expired_token(expired_token, mock_jwks_client):
    """Test get_current_user returns None for expired token."""
-    monkeypatch.setattr(settings, "supabase_jwt_secret", jwt_secret)
+    with patch("app.core.auth._get_jwks_client", return_value=mock_jwks_client):

-    class MockRequest:
-        headers = {"Authorization": f"Bearer {expired_token}"}
+        class MockRequest:
+            headers = {"Authorization": f"Bearer {expired_token}"}

-    user = get_current_user(MockRequest())
-    assert user is None
+        user = get_current_user(MockRequest())
+        assert user is None


-async def test_get_current_user_invalid_token(jwt_secret, invalid_token, monkeypatch):
+async def test_get_current_user_invalid_token(invalid_token, mock_jwks_client):
    """Test get_current_user returns None for invalid token."""
-    monkeypatch.setattr(settings, "supabase_jwt_secret", jwt_secret)
+    with patch("app.core.auth._get_jwks_client", return_value=mock_jwks_client):

-    class MockRequest:
-        headers = {"Authorization": f"Bearer {invalid_token}"}
+        class MockRequest:
+            headers = {"Authorization": f"Bearer {invalid_token}"}

-    user = get_current_user(MockRequest())
-    assert user is None
+        user = get_current_user(MockRequest())
+        assert user is None


-async def test_get_current_user_malformed_header(jwt_secret, monkeypatch):
+async def test_get_current_user_malformed_header(mock_jwks_client):
    """Test get_current_user returns None for malformed auth header."""
-    monkeypatch.setattr(settings, "supabase_jwt_secret", jwt_secret)
+    with patch("app.core.auth._get_jwks_client", return_value=mock_jwks_client):

-    class MockRequest:
-        headers = {"Authorization": "NotBearer token"}
+        class MockRequest:
+            headers = {"Authorization": "NotBearer token"}

-    user = get_current_user(MockRequest())
-    assert user is None
+        user = get_current_user(MockRequest())
+        assert user is None


 async def test_require_auth_valid_user():
@@ -158,17 +159,16 @@ async def test_protected_endpoint_without_token(db_session):


 async def test_protected_endpoint_with_expired_token(
-    db_session, jwt_secret, expired_token, monkeypatch
+    db_session, expired_token, mock_jwks_client
 ):
    """Test that write endpoint returns 401 with expired token."""
-    monkeypatch.setattr(settings, "supabase_jwt_secret", jwt_secret)
-
-    async with AsyncClient(
-        transport=ASGITransport(app=app),
-        base_url="http://test",
-        headers={"Authorization": f"Bearer {expired_token}"},
-    ) as ac:
-        response = await ac.post("/runs", json={"game_id": 1, "name": "Test Run"})
+    with patch("app.core.auth._get_jwks_client", return_value=mock_jwks_client):
+        async with AsyncClient(
+            transport=ASGITransport(app=app),
+            base_url="http://test",
+            headers={"Authorization": f"Bearer {expired_token}"},
+        ) as ac:
+            response = await ac.post("/runs", json={"game_id": 1, "name": "Test Run"})
    assert response.status_code == 401


@@ -231,7 +231,7 @@ async def test_require_admin_user_not_in_db(db_session):


 async def test_admin_endpoint_returns_403_for_non_admin(
-    db_session, jwt_secret, monkeypatch
+    db_session, rsa_key_pair, mock_jwks_client
 ):
    """Test that admin endpoint returns 403 for authenticated non-admin user."""
    user_id = "44444444-4444-4444-4444-444444444444"
@@ -243,7 +243,7 @@ async def test_admin_endpoint_returns_403_for_non_admin(
    db_session.add(regular_user)
    await db_session.commit()

-    monkeypatch.setattr(settings, "supabase_jwt_secret", jwt_secret)
+    private_key, _ = rsa_key_pair
    token = jwt.encode(
        {
            "sub": user_id,
@@ -252,30 +252,33 @@ async def test_admin_endpoint_returns_403_for_non_admin(
            "aud": "authenticated",
            "exp": int(time.time()) + 3600,
        },
-        jwt_secret,
-        algorithm="HS256",
+        private_key,
+        algorithm="RS256",
    )

-    async with AsyncClient(
-        transport=ASGITransport(app=app),
-        base_url="http://test",
-        headers={"Authorization": f"Bearer {token}"},
-    ) as ac:
-        response = await ac.post(
-            "/games",
-            json={
-                "name": "Test Game",
-                "slug": "test-game",
-                "generation": 1,
-                "region": "Kanto",
-                "category": "core",
-            },
-        )
+    with patch("app.core.auth._get_jwks_client", return_value=mock_jwks_client):
+        async with AsyncClient(
+            transport=ASGITransport(app=app),
+            base_url="http://test",
+            headers={"Authorization": f"Bearer {token}"},
+        ) as ac:
+            response = await ac.post(
+                "/games",
+                json={
+                    "name": "Test Game",
+                    "slug": "test-game",
+                    "generation": 1,
+                    "region": "Kanto",
+                    "category": "core",
+                },
+            )
    assert response.status_code == 403
    assert response.json()["detail"] == "Admin access required"


-async def test_admin_endpoint_succeeds_for_admin(db_session, jwt_secret, monkeypatch):
+async def test_admin_endpoint_succeeds_for_admin(
+    db_session, rsa_key_pair, mock_jwks_client
+):
    """Test that admin endpoint succeeds for authenticated admin user."""
    user_id = "55555555-5555-5555-5555-555555555555"
    admin_user = User(
@@ -286,7 +289,7 @@ async def test_admin_endpoint_succeeds_for_admin(db_session, jwt_secret, monkeyp
    db_session.add(admin_user)
    await db_session.commit()

-    monkeypatch.setattr(settings, "supabase_jwt_secret", jwt_secret)
+    private_key, _ = rsa_key_pair
    token = jwt.encode(
        {
            "sub": user_id,
@@ -295,24 +298,25 @@ async def test_admin_endpoint_succeeds_for_admin(db_session, jwt_secret, monkeyp
            "aud": "authenticated",
            "exp": int(time.time()) + 3600,
        },
-        jwt_secret,
-        algorithm="HS256",
+        private_key,
+        algorithm="RS256",
    )

-    async with AsyncClient(
-        transport=ASGITransport(app=app),
-        base_url="http://test",
-        headers={"Authorization": f"Bearer {token}"},
-    ) as ac:
-        response = await ac.post(
-            "/games",
-            json={
-                "name": "Test Game",
-                "slug": "test-game",
-                "generation": 1,
-                "region": "Kanto",
-                "category": "core",
-            },
-        )
+    with patch("app.core.auth._get_jwks_client", return_value=mock_jwks_client):
+        async with AsyncClient(
+            transport=ASGITransport(app=app),
+            base_url="http://test",
+            headers={"Authorization": f"Bearer {token}"},
+        ) as ac:
+            response = await ac.post(
+                "/games",
+                json={
+                    "name": "Test Game",
+                    "slug": "test-game",
+                    "generation": 1,
+                    "region": "Kanto",
+                    "category": "core",
+                },
+            )
    assert response.status_code == 201
    assert response.json()["name"] == "Test Game"
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -41,6 +41,7 @@ source = { editable = "." }
 dependencies = [
    { name = "alembic" },
    { name = "asyncpg" },
+    { name = "cryptography" },
    { name = "fastapi" },
    { name = "pydantic" },
    { name = "pydantic-settings" },
@@ -63,6 +64,7 @@ dev = [
 requires-dist = [
    { name = "alembic", specifier = "==1.18.4" },
    { name = "asyncpg", specifier = "==0.31.0" },
+    { name = "cryptography", specifier = "==45.0.3" },
    { name = "fastapi", specifier = "==0.135.1" },
    { name = "httpx", marker = "extra == 'dev'", specifier = "==0.28.1" },
    { name = "pydantic", specifier = "==2.12.5" },
@@ -123,6 +125,39 @@ wheels = [
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 ]

+[[package]]
+name = "cffi"
+version = "2.0.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "pycparser", marker = "implementation_name != 'PyPy'" },
+]
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