In this tutorial you will learn how to set up a Telegram bot using the Telegram API. This will allow you to receive a message on Telegram after each login attempt on your server.
I am doing this on a Debian installation, but this process should also work on other Linux distributions.
You need a running vServer or Root Server from netcup with superuser access.
First, install Telegram on your smartphone and open the app.
Then search for the user "botfather" in the contacts. We create a new bot by sending "botfather" the following message:
"botfather" will ask for the name of the bot. You can choose any name you want, but note that the name must be unique. Next, choose a username. This must end with the suffix "_bot".
For example, I used these names:
Superduperbot for the bot Superduperbot_bot for the username
"botfather" will now create the bot and generate a token. We will need this later, so write down the token.
Here is an example of how the token looks:
Now, search for the newly created bot in your Telegram contacts. Next, start the bot by clicking on start or sending the message:
Next, we point our Browser to the address shown below. Replace "TOKEN" with the token you got from "botfather" in the previous step:
Write down the row of numbers coming after "id". This is our "Telegram_id" and will be needed in the next step.
Head over to your netcup server and create a script under "/etc/profile.d" named something like "telegram_message_on_login.sh" by running the command shown below. Note that any script in "/etc/profile.d" will be executed during each login to your server.
Copy the following into the terminal window. Please replace the values under TOKEN and ID with your specific data:
TOKEN="123456090:ABCDEFGHIJK-ABCDEFGHIJK" ID="123456789" HOSTNAME=$(hostname -f) DATE="$(date +"%d.%b.%Y--%H:%M")" MESSAGE=" $USER logged in at $DATE on $HOSTNAME !" URL="https://api.telegram.org/bot$TOKEN/sendMessage" curl -s -X POST $URL -d chat_id=$ID -d text="$MESSAGE" >/dev/null`
Last, make the script executable by running this command:
chmod +x /etc/profile.d/telegram_message_on_login.sh
From now on you will receive a message via Telegram everytime someone logs into your server.
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