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c0ba948825
* fix(auth): treat a signed token with wrong claims as malformed
decode_token caught jwt.PyJWTError but not pydantic.ValidationError, so a
correctly signed token without sub/exp raised out of the function. The
OIDC state cookie shares jwt_secret and has exactly that shape, and the
OAuth start endpoint is public, so an unauthenticated caller could turn
it into a 500 (or a broken WebSocket handshake) instead of a 401.
Catch ValidationError and return TokenError.MALFORMED.
The regression test signs an OIDC-state-shaped payload and asserts
MALFORMED; it raises on main.
* fix(auth): treat a signed OIDC state cookie with bad claims as unusable
_verify_state_signed had the same latent shape as decode_token: it caught
only jwt.PyJWTError, so a state cookie signed with jwt_secret but missing
required claims raised pydantic.ValidationError straight into the public
/api/v1/auth/callback/{provider} endpoint instead of returning None and
letting the handler answer 403.
Also pin the decode_token precedence a reviewer raised: an expired token
that is missing sub reports EXPIRED because jwt.decode raises before the
payload model runs.
* docs: reduce inherited backend guidance size
---------
Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
"""JWT token creation and verification."""
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from datetime import UTC, datetime, timedelta
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import jwt
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from pydantic import BaseModel, ValidationError
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from app.gateway.auth.config import get_auth_config
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from app.gateway.auth.errors import TokenError
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class TokenPayload(BaseModel):
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"""JWT token payload."""
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sub: str # user_id
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exp: datetime
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iat: datetime | None = None
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ver: int = 0 # token_version — must match User.token_version
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def create_access_token(user_id: str, expires_delta: timedelta | None = None, token_version: int = 0) -> str:
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"""Create a JWT access token.
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Args:
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user_id: The user's UUID as string
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expires_delta: Optional custom expiry, defaults to 7 days
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token_version: User's current token_version for invalidation
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Returns:
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Encoded JWT string
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"""
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config = get_auth_config()
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expiry = expires_delta or timedelta(days=config.token_expiry_days)
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now = datetime.now(UTC)
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payload = {"sub": user_id, "exp": now + expiry, "iat": now, "ver": token_version}
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return jwt.encode(payload, config.jwt_secret, algorithm="HS256")
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def decode_token(token: str) -> TokenPayload | TokenError:
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"""Decode and validate a JWT token.
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Returns:
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TokenPayload if valid, or a specific TokenError variant.
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"""
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config = get_auth_config()
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try:
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payload = jwt.decode(token, config.jwt_secret, algorithms=["HS256"])
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return TokenPayload(**payload)
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except jwt.ExpiredSignatureError:
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return TokenError.EXPIRED
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except jwt.InvalidSignatureError:
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return TokenError.INVALID_SIGNATURE
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except (jwt.PyJWTError, ValidationError):
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# A correctly signed token with the wrong claims (e.g. the OIDC state
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# cookie, which shares jwt_secret but has no sub/exp) is malformed, not
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# a server error.
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return TokenError.MALFORMED
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