Integrity Failures in Adonisjs with Mutual Tls

Mutual Transport Layer Security (mTLS) requires both the client and server to present valid certificates. In Adonisjs, mTLS is typically enforced at the reverse proxy or Node.js HTTPS layer, while the framework validates the request identity via the authenticated certificate properties. Integrity failures occur when the pipeline does not sufficiently validate the client certificate chain or when application logic treats the certificate subject as trustworthy without additional checks. This combination can allow an attacker who compromises a CA or steals a client certificate to impersonate trusted services, or bypass intended authorization boundaries if the application relies only on the presence of a certificate rather than its full chain and revocation status.

For example, an Adonisjs route may read request.socket.getPeerCertificate() and assume fields like subject or commonName are authoritative. If the server does not verify that the certificate chain anchors to a trusted CA, does not check revocation via CRL/OCSP, and does not enforce strict hostname or custom SAN matching, an attacker with a valid but stolen certificate can access endpoints intended for a specific service. This maps to OWASP API Top 10 2023 A01: Broken Object Level Authorization when identity claims derived from the certificate are used for authorization without corroborating integrity checks.

Insecure defaults in Adonisjs HTTPS server configuration can exacerbate the issue. If you create an HTTPS server in Adonisjs without explicitly specifying requestCert and rejectUnauthorized behavior, or if you do not validate the certificate against a pinned CA, the application may accept connections where the client certificate is missing or invalid. Attack patterns include presenting a certificate signed by a different CA, using an expired certificate, or chaining to a CA that should not be trusted for this service boundary. These integrity failures undermine the purpose of mTLS, which is to ensure not just confidentiality but also strong endpoint identity and data integrity between client and server.

Consider an OpenAPI spec that defines security schemes using x509 certificates; runtime findings from middleBrick can reveal mismatches between declared expectations and actual runtime behavior, such as missing chain validation or overly permissive trust stores. A secured route in Adonisjs should not only require a certificate but also validate the full chain, verify revocation, and enforce policy constraints (e.g., allowed OUs or SANs). Without these, the integrity of the mTLS boundary is compromised, enabling unauthorized access that may be logged as an authentication success but represents a broken authorization at the integrity layer.

middleBrick’s LLM/AI Security checks are not directly relevant to mTLS integrity failures, but its unauthenticated scan can detect missing authorization constraints and weak TLS configurations by analyzing the OpenAPI spec and correlating runtime observations. The scanner’s 12 security checks run in parallel, including Authentication, BOLA/IDOR, and Data Exposure, which can surface indicators that an mTLS boundary is not enforcing integrity as intended. Findings include guidance to tighten certificate validation and align implementation with the spec, helping teams detect integrity gaps before they are exploited.

Remediation focuses on strict certificate validation, chain verification, and policy enforcement within the HTTPS server configuration and application middleware. Below are concrete, realistic examples for Adonisjs projects using the built-in HTTP server or custom HTTPS providers.

Example 1: HTTPS server with strict mTLS in Adonisjs

Configure the Node.js HTTPS server to require and validate client certificates, and to reject connections where the chain cannot be verified.

const fs = require('fs');
const https = require('https');
const { Ignitor } = require('@adonisjs/ignitor');

new Ignitor(require('@adonisjs/fold'))
  .fireHttpServer()
  .then(({ httpsServer }) => {
    const options = {
      key: fs.readFileSync('path/to/server.key'),
      cert: fs.readFileSync('path/to/server.crt'),
      ca: fs.readFileSync('path/to/ca-bundle.crt'), // trusted CA bundle
      requestCert: true,
      rejectUnauthorized: true, // reject if client cert is invalid/untrusted
    };

    httpsServer = https.createServer(options, (req, res) => {
      // At this point, req.socket.getPeerCertificate() is trustworthy only if rejectUnauthorized was effective
      const cert = req.socket.getPeerCertificate();
      if (!cert || Object.keys(cert).length === 0) {
        res.statusCode = 403;
        res.end('Client certificate required');
        return;
      }
      // Enforce additional integrity checks
      const allowedOrg = 'ExampleOrg';
      const org = cert.subject.O;
      if (org !== allowedOrg) {
        res.statusCode = 403;
        res.end('Insufficient certificate privileges');
        return;
      }
      // proceed with route handling
      res.end('OK');
    });

    httpsServer.listen(8443, () => {
      console.log('mTLS server running on port 8443');
    });
  });

Example 2: Middleware to validate certificate fields and revocation hints

Add route-level middleware to verify custom constraints (e.g., allowed OU or SAN) and to check revocation indicators when available. Real-world implementations may integrate with OCSP or CRL endpoints; here we illustrate the pattern using certificate extensions accessible in Node.js.

function verifyClientCert(req, res, next) {
  const cert = req.socket.getPeerCertificate();
  if (!cert || Object.keys(cert).length === 0) {
    return res.status(403).send('Client certificate required');
  }
  // Example integrity checks
  const allowedOrg = 'ExampleOrg';
  if (cert.subject.O !== allowedOrg) {
    return res.status(403).send('Invalid organization in certificate');
  }
  // Example: ensure a custom extension or SAN matches expected service identity
  const subjectaltname = cert.subjectaltname || '';
  if (!subjectaltname.includes('example.service.internal')) {
    return res.status(403).send('Certificate missing required SAN');
  }
  // Note: For production revocation checks, use CRL/OCSP via external libraries or services
  next();
}

// Apply in a route
Route.get('/secure', verifyClientCert, async ({ response }) => {
  response.send('Authenticated and integrity-checked');
});

Example 3: Environment and trust store management

Ensure the Node.js process loads a strict CA store and does not rely on system defaults that may include overly permissive roots. Pin the CA used for issuing client certificates.

const tlsOptions = {
  key: fs.readFileSync('/etc/ssl/private/server.key'),
  cert: fs.readFileSync('/etc/ssl/certs/server.crt'),
  ca: fs.readFileSync('/etc/ssl/certs/ca-bundle-trusted.crt'), // pinned CA
  requestCert: true,
  rejectUnauthorized: true,
};
const server = https.createServer(tlsOptions, app.callback());
server.listen(8443);

Operational practices

• Keep your CA bundle up to date and remove legacy or overly broad roots.
• Rotate client certificates regularly and revoke compromised certificates via CRL/OCSP.
• Log certificate subject and serial for audit, but do not rely solely on them for authorization.
• Use middleBrick’s dashboard and CLI to scan your OpenAPI spec and runtime endpoints; findings can highlight missing validation steps and misconfigurations in mTLS setups.