Introduction
In this article, we will discuss how to check the exact SSH command used on a target machine when another machine invokes it. This can be useful for debugging and troubleshooting SSH connections, as well as for security purposes.
Prerequisites
To follow this guide, you will need:
- Two Linux machines: Machine A (local) and Machine B (target)
- SSH installed on both machines
Checking SSH Logs on Machine A
The first step is to check the SSH logs on Machine A to see the command that was executed on Machine B. To do this, use the following command:
sudo cat /var/log/auth.log | grep ssh
This command will display the SSH login attempts in the /var/log/auth.log file. Look for the line that matches the connection to Machine B and note the command.
Checking SSH Logs on Machine B
To check the SSH logs on Machine B, use the following command:
sudo cat /var/log/auth.log | grep ssh
Look for the line that matches the connection from Machine A and note the command.
Comparing Commands
Compare the commands used on both machines to see if they match. If they do not match, there may be a problem with the SSH configuration or a potential security issue.
Security Considerations
It is important to note that checking the exact SSH command used on a target machine can have security implications. It is recommended to only perform this action on trusted machines and to use secure SSH configurations.