To implement Two-Factor Authentication (2FA) in Angular applications, follow these steps:
1. Choose a 2FA provider: Select an appropriate 2FA service like Google Authenticator or Authy to generate time-based one-time passwords (TOTP).
2. Backend integration: Modify the backend API to support 2FA by adding endpoints for enabling/disabling 2FA and verifying TOTP.
3. Frontend changes: Update the login component to include an additional step for entering the TOTP after successful password authentication.
4. Enable/disable 2FA: Create components for users to enable/disable 2FA, which involves scanning a QR code generated by the backend and verifying the initial TOTP.
5. Store 2FA status: Save the user’s 2FA status in the frontend, e.g., using cookies or local storage, to enforce 2FA during future logins.
6. Guard routes: Use Angular route guards to protect sensitive routes, ensuring that only authenticated users with valid 2FA can access them.
Example of a route guard implementation:
@Injectable()
export class TwoFactorAuthGuard implements CanActivate {
constructor(private authService: AuthService, private router: Router) {}
canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
if (this.authService.isAuthenticated() && this.authService.isTwoFactorEnabled()) {
return true;
}
this.router.navigate(['/login']);
return false;
}
}
