Which brings us back to the ultimate question of "what are you actually trying to achieve?". You can bypass any of these by loading a separate OS from a pendrive or DVD and then enable access to the computer. SSH is generally the protocol we use to do this, even if it’s not the only option. But then your user can tunnel traffic over non-traditional ports. Use SSH To Remote Control Your Raspberry Pi: A complete guide Being able to control your Raspberry Pi from another computer remotely is an important part of the Raspberry Pi’s learning curve. Selecting the Gnome or KDE button will start a new session on the machine ssh.gb. (The Green Bank gateway host.) The xterm option will open a session. If it's serial multiple users (rather than parallel) then you could have a firewall script run on login for non-priveleged users and disable various traffic. Removing the execute and/or read bits on the client binaries for, eg, ssh will prevent a user from accessing it - however they could just install a new client if you leave them with install rights. what is the OP actually trying to do, stop a user from accessing clients with remote capabilities? Turn off all internet access? Are you realy wanting to prevent incoming access to ports used for remote access ? Creating an SSH connection needs both a client and a server component. There are two most widely used protocols to connect to a remote machine: SSH and RDP. LE2: hosts_access supports usernames too, but AFAIK this is insecure. SSH (Secure Shell), also referred to as Secure Socket Shell, is a protocol that allows you to securely connect to a remote device or a server using a text-based interface. This application allows you to launch conveniently any command you want on a remote computer through SSH only with the push of a button on the screen of your mobile phone or tablet. Compared to iptables, the advantage is that you don't need to know the ports of the services, but not all services support this mechanism. You'll need to edit /etc/hosts.allow and /etc/ny for this. LE: A couple of network services including RPC (used by NFS) and SSH, use the hosts_access mechanism ( man hosts_access) for host based authentication/authorization. X uses IP addresses for authentication/authorization or cookies.Īs you can see, there's no easy way to enable/disable access to these services for a specific user.You can also directly control network devices with SSH. The usernames & passwords are usually stored in a file called passdb.tdb, not in /etc/shadow, so passwd doesn't change the password of a Samba user. Resolve issues remotely with 1 Remote Desktop & Control Software. Samba uses usernames & passwords for mounting most of the time ( security = user) and I think that CIFS also supports using UIDs when accessing individual files just like NFS.Anyway the idea is that mounting authorization is done per machine, not per user. Also it can use other methods, like Kerberos. The NFS server uses IP addresses for mounting authentication/authorization and the user id when individual files are used (the regular Unix permissions are used).SSH uses usernames & passwords for authentication/authorization.
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