Send Telegram notification about SSH login

ssh-login-notification.sh

#!/bin/bash

# this file need to be stored in /etc/profile.d

# variables below must be initialized in order to make script working

CHAT_ID=""
BOT_TOKEN=""

DATE_EXEC="$(date "+%d %b %Y %H:%M")"
TMPFILE='/tmp/ipinfo-$DATE_EXEC.txt'

if [ -n "$SSH_CLIENT" ] && [ -z "$TMUX" ]; then
  IP=$(echo $SSH_CLIENT | awk '{print $1}')
  PORT=$(echo $SSH_CLIENT | awk '{print $3}')
  HOSTNAME=$(hostname -f)
  IPADDR=$(hostname -I | awk '{print $1}') 

  curl https://ipinfo.io/$IP -s -o $TMPFILE

  ORG=$(cat $TMPFILE | sed -n 's/^  "org":[[:space:]]*//p' | sed 's/"//g')
  CITY=$(cat $TMPFILE | sed -n 's/^  "city":[[:space:]]*//p' | sed 's/"//g')
  REGION=$(cat $TMPFILE | sed -n 's/^  "region":[[:space:]]*//p' | sed 's/"//g')
  COUNTRY=$(cat $TMPFILE | sed -n 's/^  "country":[[:space:]]*//p' | sed 's/"//g')

  TEXT="Date: $DATE_EXEC\n\nUser: $USER\n\nHostname: $HOSTNAME\n\nHost IP: $IPADDR\n\nFrom: $IP\n\nOrg: $ORG\n\nLocation: $CITY $REGION $COUNTRY\n\nPort: $PORT"

  curl \
      --request POST \
      --url "https://api.telegram.org/bot$BOT_TOKEN/sendMessage" \
      --header "Content-Type:application/json" \
      --data "{\"chat_id\":$CHAT_ID,\"text\":\"$TEXT\"}" > /dev/null

  rm $TMPFILE
fi