I run an Azure service exclusively for my Telegram bot. Since Telegram already handles user authentication, OAuth2.0 seems unnecessary. What reliable method can I use to ensure that only my bot accesses the service?
The simplest solution, given that Telegram already validates its users, is to implement a shared secret approach. For instance, assign your bot a unique token and have it include this token in all its requests as either a custom HTTP header or query parameter. Your Azure service would then only process requests containing the correct token. This method ensures that only your bot, which is aware of the secret, gains access. It is lightweight, effective, and avoids the full complexity of OAuth2 implementations.
In my experience deploying Telegram bots on Azure, I found that combining IP filtering with client-side certificates provided robust protection. By setting up IP restrictions and having the bot present a certificate during connection, the service only accepted valid requests from known sources. This method not only made unauthorized access more difficult but also added a layer of encryption that wasn’t available with a shared secret alone. It is a slightly more complex setup, but the additional security measures help prevent any misuse of the service while keeping configurations manageable.
i used hmac based signing for each request, so the bot signs every call with a secret key. the server then verifies it. its lean, and if you rotate keys often it stays secure. simple and avoids full oauth implementation