How to SSH Tunnel Through a Bastion Host to a Private Instance Using Go's x/crypto/ssh?

SSH Connection to a Private Instance via Bastion Node with Go x/crypto/ssh

To establish an SSH connection to a private instance through a bastion node using Go's "x/crypto/ssh" package:

Establishing the SSH Connection:

1. Connect to the bastion host using ssh.Dial with the appropriate host address and configuration.
2. Dial a connection to the service host from the bastion host using the Dial method on the bastion client.
3. Create an ssh.ClientConn using ssh.NewClientConn from the dialed connection.
4. Finally, create a new ssh.Client using ssh.NewClient from the client connection.

This process results in an SSH client (sClient) that is connected to the service host via the bastion host.

Running Commands and File Transfer:

Once the connection is established, the sClient can be used to run commands on the service host by issuing ssh.Sessions. File transfer can be performed using the ssh.SFTPClient provided by the client connection (ncc).

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