Missing Authentication in Axum with Cockroachdb

When an Axum service connects directly to a Cockroachdb cluster without enforcing authentication on incoming HTTP requests, the API surface can expose database-backed endpoints to unauthenticated actors. In this scenario, the application may accept requests that include resource identifiers (e.g., user IDs or record IDs) and use those identifiers to build Cockroachdb SQL queries without first validating the caller's identity or authorization.

Because middleBrick scans the unauthenticated attack surface, it can detect endpoints where no authentication gate is enforced before data access. A missing authentication check in Axum routes means an attacker can supply crafted identifiers and observe whether the backend returns data or errors, potentially leading to BOLA/IDOR findings. If those endpoints also return sensitive user data stored in Cockroachdb, the risk of data exposure increases, and middleBrick will flag the endpoint under Data Exposure and Authentication checks.

The combination is notable because Cockroachdb does not inherently enforce HTTP-layer authentication; it relies on the application to provide correct credentials and authorization. An Axum handler that opens a Cockroachdb connection using a service account with broad permissions and then executes queries based on unchecked user input can inadvertently allow horizontal or vertical privilege escalation. middleByte's checks for BOLA/IDOR, Property Authorization, and Unsafe Consumption are designed to surface these patterns by correlating runtime behavior with the OpenAPI specification, including any $ref definitions that describe authentication requirements.

Real-world attack patterns include enumeration of numeric or UUID identifiers to discover other users' records, or manipulation of query parameters to trigger SQL errors that reveal schema details. Because middleBrick tests input validation and rate limiting in parallel, it can identify whether missing authentication is compounded by weak input checks or missing throttling, increasing the severity assigned to findings.

Remediation centers on ensuring every Axum route that interacts with Cockroachdb first validates the caller and applies principle of least privilege. Below are concrete code examples showing how to enforce authentication and scope queries safely.

• Enforce a guard before database access:

use axum::{routing::get, Router};
use std::net::SocketAddr;
use cockroachdb_rs::Client; // hypothetical Cockroachdb client

async fn get_user_profile(
    user_id: String,
    auth: Option, // extracted from bearer token or session
    db: Client,
) -> Result {
    let claims = auth.ok_or((StatusCode::UNAUTHORIZED, "Missing authentication"))?;
    if claims.user_id != user_id {
        return Err((StatusCode::FORBIDDEN, "Insufficient permissions".to_string()));
    }
    let row = db.query_one(
        "SELECT id, email, name FROM users WHERE id = $1 AND tenant_id = $2",
        &[&user_id, &claims.tenant_id],
    ).await.map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
    // map row to DTO and return
    Ok(warp::reply::json(&row))
}

async fn auth_layer(
    request: Request,
) -> Result {
    // validate bearer token, populate AuthClaims
    validate_token(request.headers())
}

• Use a shared pool with least-privilege role:

use cockroachdb_rs::Client;

#[tokio::main]
async fn main() -> Result<(), Box> {
    let db = Client::connect(
        "postgresql://readonly_user:password@host:26257/dbname?sslmode=require",
        None,
    ).await?;
    // configure routes with state containing db client
    let app = Router::new()
        .route("/profile/:user_id", get(get_user_profile))
        .with_state(db);
    axum::Server::bind(&"0.0.0.0:3000".parse()?)
        .serve(app.into_make_service())
        .await?;
    Ok(())
}

• Apply tenant isolation in queries using parameterized $1, $2 placeholders to avoid SQL injection and ensure row-level security; never concatenate identifiers.

middleBrick can validate these patterns by checking whether authentication checks precede database calls and whether parameterized queries are used. Its OpenAPI/Swagger analysis (supporting 2.0, 3.0, 3.1 with full $ref resolution) can confirm that securitySchemes are referenced on endpoints, and runtime probes verify that unauthenticated requests do not return sensitive Cockroachdb records.