SSH Connection Setup

Lin­ux Serv­er

Lin­ux Desk­top

In­stall SSH Serv­er and Client

The SSH client is the soft­ware that makes an SSH con­nec­tion to a re­mote in­stance. The SSH serv­er is the soft­ware that ac­cepts the con­nec­tion no the re­mote in­stance. In case we don't need to con­nect to the client in­stance – i.e. it is lap­top, we do not neet to in­stall the serv­er.

sudo apt install openssh-server openssh-client

When the serv­er is in­stalled its ser­vice is au­to­mat­i­cal­ly en­abled and start­ed, so if we have in­stalled both pack­ages above, we can test whether it is op­er­a­tional by an SSH to the loop-back in­ter­face.

sudo apt install openssh-server openssh-client

By de­fault with­in the SSH server's con­fig­u­ra­tion the pass­word lo­gin is en­abled. It is much safer to use key based au­then­ti­ca­tion and once it is set­up and op­er­a­tional we can safe­ly dis­able the pass­word au­then­ti­ca­tion.

Set­up Key Based Au­then­ti­ca­tion

First we need to gen­er­ate SSH key pair . This should be done at the client's side. It is prefer­able to use ED25519 based key, be­cause it is more se­cure and al­so it is faster be­cause is much short­en es­pe­cial­ly than 4096 bit RSA key.

#Ref­er­ences

• SSH Key: Ed25519 vs RSA
• Is it bad that my ed25519 key is so short com­pared to a RSA key?
• Up­grade Your SSH Key to Ed25519
• How to se­cure your SSH serv­er with pub­lic key Ed25519 El­lip­tic Curve Cryp­tog­ra­phy
• The pre­vi­ous ver­sion of the an­swer which us­es RSA key.

Ref­er­ences

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Reg­is­ter: Lin­ux Serv­er

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5.09.2022

5.09.2022

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