How to SSH into Linux Servers Using Keys in Go?

SSH into Linux Servers Using Keys in Go

Connecting to a server using SSH and a key in Golang can be achieved through the ssh package. Here's how you can do it:

The Dial function requires an ssh.AuthMethod instance, which can be created from SSH keys using ssh.PublicKeys. To obtain a signer from the PEM bytes, use ssh.ParsePrivateKey.

To use the Signers field of a private key, you can use ssh.PublicKeys(signers...) as your authentication method.

Example Code:

<code class="go">import (
    "log"
    "net"
    "os"

    "github.com/gliderlabs/ssh"
)

func main() {
    sock, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK"))
    if err != nil {
        log.Fatal(err)
    }

    agent := agent.NewClient(sock)

    signers, err := agent.Signers()
    if err != nil {
        log.Fatal(err)
    }

    auths := []ssh.AuthMethod{ssh.PublicKeys(signers...)}

    cfg := &ssh.ClientConfig{
        User: "username",
        Auth: auths,
    }
    cfg.SetDefaults()

    client, err := ssh.Dial("tcp", "aws-hostname:22", cfg)
    if err != nil {
        log.Fatal(err)
    }

    session, err := client.NewSession()
    if err != nil {
        log.Fatal(err)
    }

    log.Println("we have a session!")
}</code>

This code mimics the ssh -i x.pem user@host command, establishing an SSH session with the specified server using the provided key. You can now execute commands within the server through the session variable.

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