How to Secure Laravel Apps with 2FA via SMS

This article demonstrates how to integrate two-factor authentication (2FA) into a Laravel application using Twilio SMS for verification. It enhances security by requiring both a password and a one-time code sent via SMS.

Key Features:

• SMS Verification: Leverages Twilio's SMS API to send verification codes to users' mobile phones.
• Laravel Integration: Modifies Laravel's authentication system to incorporate the 2FA process.
• Database Migrations: Creates database tables to store user phone numbers and verification tokens.
• Model Updates: Extends Laravel's user model to handle phone numbers and the token model for code generation and management.
• User Interface: Includes updated registration and login views to collect phone numbers and verification codes.
• Error Handling: Implements robust error handling to provide clear feedback to users.

Implementation Steps:

1. Project Setup: Create a new Laravel project and install the Twilio PHP SDK (composer require twilio/sdk). Configure your .env file with your Twilio Account SID, Auth Token, and phone number.

2. Database Migrations: Add country_code and phone fields to the users table and create a tokens table to store verification codes.

3. Model Updates: Update the User model to include the new fields and a relationship to the tokens table. Enhance the Token model with methods for code generation, SMS sending (using Twilio), and validity checks.

4. View Modifications: Update the registration view to include fields for country code and phone number. Create a separate view for entering the verification code.

5. Controller Adjustments: Modify the RegisterController to handle phone number registration and the LoginController to initiate the 2FA process, send the code via Twilio, and validate the code upon submission. A custom Twilio service provider is created for easy access to the Twilio client.

The article provides code snippets for these modifications, illustrating database schema, model methods, and controller logic. A visual walkthrough of the user flow is included:

The complete demo application is available on GitHub. The article concludes with a FAQ section addressing common questions about securing Laravel applications with 2FA via SMS, including troubleshooting, alternative services, and user experience considerations.

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