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fix: Auth Hardening for centauri-sentinel #1

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fix: Auth Hardening for centauri-sentinel #1

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1 change: 1 addition & 0 deletions sentinel/web/app.py
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Original file line number Diff line number Diff line change
Expand Up @@ -143,6 +143,7 @@ async def internal_snapshot(nonce: str, request: Request) -> Response:
"""Single-use JPEG endpoint for the Obico ML API URL-fetch flow."""
if internal_token is not None:
t = request.query_params.get("t") or ""
# Use constant-time comparison to prevent timing side-channel attack
if not t or not hmac.compare_digest(t, internal_token):
raise HTTPException(status_code=403, detail="Forbidden: Invalid internal token")

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