Fix BOLA (Broken Object Level Authorization) in Tide
BOLA (Broken Object Level Authorization) is the single most exploited vulnerability in modern APIs. In the context of Tide and Rust, it occurs when a handler trusts a URL parameter (like /api/v1/resource/:id) to fetch a record without verifying that the authenticated user has permission to access that specific object. If your database query doesn't include the user_id from the session, you're handing out unauthorized data.
The Vulnerable Pattern
async fn get_document(req: Request) -> tide::Result {
let doc_id: String = req.param("id")?;
// VULNERABLE: Fetching record solely by ID provided in URL.
// Any authenticated user can guess another user's ID and steal their data.
let doc = req.state().db.find_document(&doc_id).await?;
Ok(Response::builder(200).body(json!(doc)).build())
} The Secure Implementation
The fix involves moving authorization logic from the application layer's 'if' statements directly into the data access layer. By passing the authenticated user's ID into the database query as a filter, you ensure that the database engine itself enforces object-level access control. If a user attempts to access an ID they don't own, the query returns null, preventing data leakage regardless of the input ID.
async fn get_document(req: Request) -> tide::Result { let doc_id: String = req.param("id")?; // SECURE: Extract the authenticated User ID from the request extensions (populated by middleware). let user = req.ext:: ().ok_or_else(|| tide::Error::from_str(401, "Unauthorized"))?; // SECURE: Query must include the owner's ID to ensure authorization at the object level. let doc = req.state().db.find_document_by_id_and_owner(&doc_id, &user.id).await?; match doc { Some(d) => Ok(Response::builder(200).body(json!(d)).build()), None => Ok(Response::new(404)) // Return 404 to avoid leaking existence of IDs }
}
Your Tide API
might be exposed to BOLA (Broken Object Level Authorization)
74% of Tide apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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