i want to save the user’s IP when he connects to it’s home folder, this is because i’m a user in a server where my team has a folder where our public_html is located, but we use the same account, so i just want to register who connected.
So i want to make a script that triggers when a connection is made and save the user’s IP into a hidden file.
But i don’t know if i could leave running a script in background to do it, and How?
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Answer
If you’re a root on that machine, you can simply check the auth log / messages / journal / … (depends on the distribution). By default sshd logs all you need already.
If you’re not a root, then you’ll have to keep in mind this will never be secure. You can do this in the user’s bash profile, but:
- Since it’s running as the same user, whoever logs in can just change the file (you can’t hide it)
- Anyone can workaround the script by executing some other command instead of the shell (for example
ssh user@host /some/commandwill not be logged) - It’s not secret.
If that’s ok with you, then you just need to add this to bashrc
echo "new connection at $(date) from ${SSH_CLIENT}" >> ~/your_connection_log