Api Key Exposure in Fiber with Cockroachdb

Api Key Exposure occurs when an API key intended for server-side use is inadvertently accessible to clients. In a Fiber application using Cockroachdb as the backend database, this typically arises from mishandled environment configuration, overly permissive routes, or improper serialization of database responses. Fiber, being a fast Express-compatible web framework for Node.js, does not inherently leak keys, but developer patterns can expose sensitive credentials when serving database-connected endpoints.

When a Fiber route constructs a Cockroachdb connection string or query parameters using values from request context or logs, and those values are included in error messages or response bodies, an attacker who triggers an error or inspects network traffic may receive the key. For example, including the full connection URI in a JSON error response or debug payload can disclose the database credentials to unauthenticated callers. This is especially risky when CORS is misconfigured in Fiber, allowing cross-origin scripts to read responses that contain sensitive data.

Middleware that logs incoming requests and outgoing responses without redaction can also contribute to exposure. If a Fiber middleware pipeline logs the full request URL, headers, or body, and a client sends an API key as a query parameter or header intended for Cockroachdb authentication, that key may be written to logs or monitoring systems accessible to unauthorized parties. Because Cockroachdb authentication relies on secure credentials, any exposure can lead to unauthorized database access, data exfiltration, or further lateral movement within cloud environments.

The combination of Fiber’s flexible routing and Cockroachdb’s connection requirements increases risk when developers inadvertently treat database credentials as request-scoped data. For instance, dynamically generating a Cockroachdb client per request using credentials passed from the client (rather than server-side vaults) means the key must travel through the Fiber application stack, creating transient exposure points. Without strict input validation and output encoding in Fiber handlers, these credentials can leak through error traces or incomplete redactions.

middleBrick scans identify such exposure by testing unauthenticated endpoints and analyzing OpenAPI specs for routes that handle sensitive parameters. The tool flags endpoints where authentication is missing or where responses may include credentials, helping teams correlate findings with frameworks like Fiber and databases like Cockroachdb. By reviewing generated reports, developers can see which routes risk exposing database authentication material and apply targeted remediation.

To prevent Api Key Exposure in Fiber applications using Cockroachdb, keep database credentials strictly server-side and never propagate them to the request/response cycle. Use environment variables loaded at startup, and ensure that no route or middleware echoes credentials back to the client.

1. Secure Cockroachdb connection setup

Initialize the Cockroachdb client once at application startup using server-side environment variables, and reuse it across requests. Do not construct connection strings from user input.

const { Client } = require('pg'); // Cockroachdb is PostgreSQL-wire compatible
const express = require('fastify')(); // Using Fastify-style for clarity; Fiber equivalent uses app.get etc.

const db = new Client({
  connectionString: process.env.COCKROACHDB_URL, // Load from secure environment
  ssl: {
    rejectUnauthorized: true,
  },
});

await db.connect();

// Use the shared client in routes; do not recreate per request with inline credentials
app.get('/users/:id', async (req, res) => {
  const result = await db.query('SELECT id, name FROM users WHERE id = $1', [req.params.id]);
  res.send(result.rows);
});

2. Avoid logging or echoing credentials

Ensure logging middleware does not capture sensitive headers or query parameters that may include API keys. Redact or omit fields that could contain authentication material.

// Example Fiber-compatible middleware to sanitize logs
app.use((req, res, next) => {
  const safeQuery = { ...req.query };
  if (safeQuery.api_key) {
    safeQuery.api_key = '***REDACTED***';
  }
  // safe logging using sanitized data
  console.log({ method: req.method, url: req.url, query: safeQuery });
  next();
});

3. Validate and restrict inputs before using with Cockroachdb

Use strict validation on route parameters and query strings to prevent injection or leakage through malformed requests that trigger verbose errors containing stack traces or config details.

const { param } = require('express-validator');
app.get('/profile',
  param('userId').isUUID().toInt(),
  async (req, res) => {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      return res.status(400).json({ errors: errors.array() });
    }
    const result = await db.query('SELECT id, email FROM profiles WHERE user_id = $1', [req.params.userId]);
    res.json(result.rows[0]);
  }
);

4. Error handling without disclosureOverride default error handlers in Fiber to ensure that Cockroachdb connection or query errors do not return internal details, including credentials or schema information.

app.set('trust proxy', true);
app.use((err, req, res, next) => {
  // Log full error internally for debugging, but send generic message to client
  console.error(err);
  res.status(500).json({ error: 'Internal server error' });
});

5. Use least-privilege database roles

Configure Cockroachdb roles with minimal permissions for the Fiber application’s service account, ensuring that even if an API key were exposed, the blast radius is limited.

-- Cockroachdb SQL example to create a restricted role
CREATE ROAST fiber_app WITH LOGIN PASSWORD 'strong-password';
GRANT SELECT, INSERT ON TABLE users TO fiber_app;
REVOKE ALL ON DATABASE mydb FROM PUBLIC;