How to Establish an SSH Connection to a Private Instance via a Bastion Host Using Go's x/crypto/ssh?

Establishing SSH Connection to Private Instance Over Bastion Node with Go's x/crypto/ssh

Scenario Overview

In a VPC with public and private subnets, a "bastion" instance resides in the public subnet, providing access to the private "service instance" in the private subnet.

Connecting via Go's x/crypto/ssh

To connect to the service instance via Go's x/crypto/ssh, follow these steps:

1. Establish Bastion Connection:

   bClient, err := ssh.Dial("tcp", bastionAddr, config)
   if err != nil {
       log.Fatal(err)
   }

2. Dial Connection to Service Instance:

   conn, err := bClient.Dial("tcp", serviceAddr)
   if err != nil {
       log.Fatal(err)
   }

3. Create Virtual SSH Connection:

   ncc, chans, reqs, err := ssh.NewClientConn(conn, serviceAddr, config)
   if err != nil {
       log.Fatal(err)
   }

4. Instantiate SSH Client for Service Host:

   sClient := ssh.NewClient(ncc, chans, reqs)

5. Use SSH Client to Execute Commands and Upload Files
   sClient can now be used for various SSH operations, such as running ls -l or transferring files.

Alternative to nc Command

The x/crypto/ssh library provides the Dial method, which allows for establishing a connection to the service host from the bastion host without using the nc command.

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