How do I restrict SSH access to specific users?

How do I restrict SSH access to specific users?

Restrict certain users log onto a system via SSH server

  1. Step # 1: Open sshd_config file. # vi /etc/ssh/sshd_config.
  2. Step # 2: Add a user. Only allow user vivek to login by adding following line: AllowUsers vivek.
  3. Step # 3: Restart sshd. Save and close the file.

How do I setup a restricted SSH user for port forwarding?

How to create a restricted SSH user for port forwarding?

  1. execute shell commands.
  2. access files or upload files to the server.
  3. use the server as proxy (e.g. webproxy)
  4. access local services which were otherwise not publicly accessible due to a firewall.
  5. kill the server.

How do I limit SSH in Linux?

Steps to limit concurrent connection on SSH server: Open terminal application. Open sshd_config file using your preferred text editor. $ sudo vi /etc/ssh/sshd_config [sudo] password for user: Look for MaxStartups option and set the value to the maximum simultaneous connections to allow.

How do I restrict SSH to the home directory?

  1. Login as the root user. Type any one of the following command:
  2. Create the chroot jail. I’m going to set /home/jails/ directory to restrict an ssh user session to this directory:
  3. Set permissions.
  4. Install bash shell in $D.
  5. Add user to the the system.
  6. Configure sshd.
  7. Restart sshd service.
  8. Test it.

What is a reverse SSH tunnel?

Reverse SSH Tunneling enables you to access remote machines behind NAT. For instance, you can access your office from home. Therefore, Reverse SSH Tunneling is a technique that enables you to SSH your Linux-based system that doesn’t have a public IP address.

How secure is SSH tunnel?

On the other hand, if you’re a geek with access to an SSH server, an SSH tunnel is an easy way to encrypt and tunnel network traffic – and the encryption is just as good as a VPN’s encryption.

How does SSH proxy work?

The SSH client will create a SOCKS proxy you can configure applications to use. All the traffic sent through the proxy would be sent through the SSH server. This is similar to local forwarding—it takes local traffic sent to a specific port on your PC and sends it over the SSH connection to a remote location.

Can multiple users SSH at the same time?

As you probably know, we can SSH into a remote Linux system by the same user multiple times. There is no limit! You could simply open multiple Terminal windows (or multiple tabs in the Terminal) and initiate multiple SSH sessions from each tab by the same user account.