Environment and Setup

Owned by Yuchen Lin
Last updated: Aug 07, 2024
1 min read

VNEV/ ssh/ realvnc/ openvpn/ docker/ ROS 2 building

 

Secure Shell Protocol(SSH)

SSH is a protocol for secure communication between local and remote devices (servers) over an unprotected network. (Service Client Architecture)

Generating Key-pairs.

key.pub: public shared key used for authentication(Copied to server).

key: private key used for authenticate and decrypt data from server

Layer:

Application layer:

  • Terminal on the client's computer

Transport layer:

Client Side:

  • Send username, hostname, private key

Server Side:

  • Look for another pair on the server

After authentication, establish a user authentication layer (information is transmitted through this layer)

image-20240807-012219.png

Establish User Authentication layer:

Option 1:

Use ssh-copy-id utilities to add the public key to the server

Option 2:

Manually add public key to the follow file .ssh/authorized_keys

Option 3:

Enter password to log into the device

 

File Transfer:

SFTP: able to transfer file && manage the file system

SCP: Only Transfer the file to the required location


Tunnelling:

Remote port forwarding:

Server can access service running on local

Local port forwarding:

Local can access service running on server

Forward a port to the other device using a different port. E.g: 8080 on client and 8001 on server

Reference

SSH: Architecture And Applications (SSH, SCP, SFTP, Tunneling or Port Forwarding)

RFC 4251: The Secure Shell (SSH) Protocol Architecture