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

Linda Hamilton
Release: 2024-12-09 18:47:10
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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)
    }
    Copy after login
  2. Dial Connection to Service Instance:

    conn, err := bClient.Dial("tcp", serviceAddr)
    if err != nil {
        log.Fatal(err)
    }
    Copy after login
  3. Create Virtual SSH Connection:

    ncc, chans, reqs, err := ssh.NewClientConn(conn, serviceAddr, config)
    if err != nil {
        log.Fatal(err)
    }
    Copy after login
  4. Instantiate SSH Client for Service Host:

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