![]() ![]() To make it as easy as possible, the Twilio Node.js helper library not only provides you with functionality to build TwiML responses or interact with the API endpoints, it also includes the feature to validate requests. X-Twilio-Signature validation using the Twilio Node.js helper library Sidenote: in case you’re using serverless functions via Twilio Runtime, you might have seen the access control setting, which enables Twilio signature validation for every incoming request. If they do, you can be sure that Twilio sent the request you received. ![]() To validate incoming requests, you can perform the same signature procedure and compare if your generated signature and the sent signature match. ![]() A third party can not generate the same hashed Twilio signature without having access to it. The AuthToken is crucial here because its value is only accessible to Twilio and yourself. The resulted string is then signed using HMAC-SHA1 using your AuthToken as the key. This header is an encoded string representing the request URL and the sorted request parameters. When Twilio sends a request to your defined webhook URL, it will include the x-twilio-signature header. Let’s have a look at how this works in detail! The X-Twilio-Signature header This way your webhook URLs are not accessible without a username/password combination in the first place.Ī third option is to validate if the incoming requests were sent by Twilio using the X-Twilio-Signature header which is the core of this article. What you could do additionally is to secure your endpoints with HTTP authentication. Man-in-the-middle attacks are a common risk, and if you’re not serving your Twilio configuration over a secure connection, you can never be sure that a third party didn’t alter it. How can you make sure only Twilio is interacting with your endpoints?įirst, make sure you’re using HTTPS. ![]() But as the Twilio docs describe, it’s crucial if you expose sensitive data or mutate existant datasets like in our rating example. Securing your webhook URLs is always recommended. The hacker is now able to make requests to your application, which messes with the result of your event rating and makes it useless. Unfortunately, an evil hacker found your webhook HTTP endpoint and recognizes the responded TwiML response as Twilio configuration. Every incoming SMS to your number triggers a webhook to your infrastructure that can write the included data to disk. Let’s assume you built a rating application that allows users to rate an event they’re at by sending an SMS to a certain number. These endpoints can be hosted anywhere as long as they’re available publicly and accessible by Twilio’s infrastructure. Your defined HTTP endpoints have to respond with a Twilio-understandable configuration language called TwiML (Twilio Markup Language). A webhook is an HTTP request that Twilio performs to find out what the reaction to a Twilio even like an incoming SMS should be. To respond to events like incoming messages, you can define a webhook URL. Developers can build applications to interact with their users and react to their responses. Twilio’s APIs allow developers to reinvent communications with things like programmable phone calls, SMS or intelligent chatbots. How to secure Twilio webhook URLs in Node.js ![]()
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