Poodle Attack in Adonisjs with Api Keys

The Poodle attack (Padding Oracle On Downgraded Legacy Encryption) exploits weaknesses in SSL 3.0 and, in API contexts, can manifest when strong transport protections are absent and authentication is delegated to bearer tokens such as API keys. In AdonisJS, a common pattern is to validate API keys via middleware before routing requests to application logic. If the API key validation occurs over a connection that does not mandate TLS, an attacker can perform adaptive chosen-ciphertext attacks against the encrypted traffic, especially when cipher suites are negotiated down to legacy options.

Consider an AdonisJS project that accepts API keys in the Authorization header but does not enforce HTTPS across all routes. An API key like ak_live_abc123 may be transmitted in plaintext or within a downgradeable TLS session. The Poodle vector is not a flaw in AdonisJS itself, but a configuration and deployment oversight: missing HTTP Strict Transport Security (HSTS), lack of explicit TLS enforcement, and accepting requests on both HTTP and HTTP-terminated load balancers without redirecting to HTTPS. When an attacker can force a session to use a weak cipher or protocol version, they can iteratively decrypt captured ciphertext by observing whether padding validation succeeds, potentially exposing the API key in the process.

Another dimension is OpenAPI/Swagger spec analysis combined with runtime findings. If your spec defines securitySchemes using an API key in a header but the server component does not enforce transport security, the spec’s security expectations diverge from runtime behavior. middleBrick’s 12 security checks, including Encryption and Input Validation, would flag missing transport encryption and improper key handling. The scanner correlates spec definitions with runtime behavior, highlighting that an API key transmitted without encryption is effectively exposed regardless of application-layer hashing or storage practices.

SSRF and unsafe consumption further intersect with this risk. If an AdonisJS endpoint accepts a user-supplied URL to call downstream services and also forwards API keys without validating the destination, an attacker might coerce the server into making requests to a malicious listener that participates in protocol downgrade or padding oracle probing. This amplifies the Poodle concern, because the API key may travel over a compromised channel to an unintended host. Instrumenting your API spec with middleBrick can surface such integration risks, showing where key propagation occurs alongside external calls.

Remediation centers on enforcing strong transport, tightening key validation, and ensuring that API keys are never transmitted or processed over insecure channels. Below are concrete patterns for AdonisJS that align with the framework’s middleware and provider architecture.

1. Enforce HTTPS and HSTS

Ensure all production traffic uses TLS. In start/hooks.ts, redirect HTTP to HTTPS before middleware runs:

import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext'

export default class HttpsRedirectMiddleware {
  public async handle(ctx: HttpContextContract, next: () => Promise) {
    if (ctx.request.url().startsWith('http://')) {
      ctx.response.redirectPermanent(ctx.request.url().replace('http://', 'https://'))
      return
    }
    await next()
  }
}

Register this middleware as the first entry in your global middleware stack and configure HSTS headers in start/middleware.ts:

import { middleware } from '@ioc:Adonis/Core/Middleware'

export const middleware = {
  ...,
  securityHeaders: [
    () => {
      return {
        'Strict-Transport-Security': 'max-age=31536000; includeSubDomains; preload',
        'X-Content-Type-Options': 'nosniff',
        'X-Frame-Options': 'DENY',
      }
    }
  ]
}

2. Validate and Scope API Keys

Use middleware to verify API keys against a secure store and bind them to specific scopes. In start/middleware.ts, add an API key guard:

import { Exception } from '@poppinss/utils'
import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext'

export default class ApiKeyMiddleware {
  public async handle(ctx: HttpContextContract, next: () => Promise<void>) {
    const key = ctx.request.header('authorization')?.replace('Bearer ', '')
    if (!key || !await this.isValidKey(key)) {
      throw new Exception('Unauthorized', 401, 'E_INVALID_API_KEY')
    }
    ctx.auth.user = { scope: this.getScope(key) } // attach scope for downstream checks
    await next()
  }

  private async isValidKey(key: string): Promise<boolean> {
    // Example: constant-time lookup against a hashed store
    const hashed = await Database.from('api_keys').where('hash', hashKey(key)).first()
    return !!hashed
  }

  private getScope(key: string): string {
    // Derive scope from key metadata
    return 'public'
  }
}

Ensure that key validation occurs over HTTPS only by configuring your server (e.g., via reverse proxy or AdonisJS serve options) to reject cleartext HTTP.

3. Avoid Key Exposure in Logs and Error Messages

Sanitize headers before logging. In your logging provider, redact sensitive headers:

import { LoggingProvider } from '@ioc:Adonis/Core/Logger'

LoggingProvider.hooks((logger) => {
  logger.formatters.push((log) => {
    if (log.headers) {
      delete log.headers['authorization']
    }
    return log
  })
})

This prevents API keys from being persisted inadvertently, reducing the blast radius if logs are exposed.

4. Combine with Input Validation and Rate Limiting

Use AdonisJS schema validation to ensure request payloads do not inadvertently echo API keys or secrets. Pair with rate limiting to mitigate brute-force attempts against key validation endpoints:

import { schema } from '@ioc:Adonis/Core/Validator'
import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext'

const apiKeySchema = schema.create({
  api_key: schema.string.optional([ rule('maxLength', 255 ) ])
})

export async function validateKey(ctx: HttpContextContract) {
  const payload = await ctx.validate({
    schema: apiKeySchema,
    errorMessages: { 'maxLength': 'Field is too long' }
  })
  // proceed with safe payload
}