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tunnel.go
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tunnel.go
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package sshhop
import (
"fmt"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
"log"
"net"
"os"
"sync"
"bytes"
)
type SSHtunnel struct {
Server *Endpoint
Remote []string
ErrorChans []chan error
ServerClient *ssh.Client
Config *ssh.ClientConfig
ServerConnection *ssh.ServerConfig
TargetClients []*ssh.Client
sync.Mutex
}
func (tunnel *SSHtunnel) Start() error {
var err error
tunnel.ErrorChans = make([]chan error, len(tunnel.Remote))
tunnel.TargetClients = make([]*ssh.Client, 0)
tunnel.ServerClient, err = ssh.Dial("tcp", tunnel.Server.String(), tunnel.Config)
if err != nil {
fmt.Printf("Server dial error: %s\n", err)
os.Exit(1)
return err
}
//
for i, _ := range tunnel.Remote {
conn, err := tunnel.ServerClient.Dial("tcp", tunnel.Remote[i])
if err != nil {
return err
}
ncc, chans, reqs, err := ssh.NewClientConn(conn, tunnel.Remote[i], tunnel.Config)
if err != nil {
log.Fatalf("New client connection error: %s\n", err)
return err
}
client := ssh.NewClient(ncc, chans, reqs)
//Keep clients in array
tunnel.TargetClients = append(tunnel.TargetClients, client)
//Execute a command
//Ideally this would be done in a go routine for concurrency
session, _ := client.NewSession()
defer session.Close()
var stdoutBuf bytes.Buffer
session.Stdout = &stdoutBuf
session.Run("hostname")
log.Printf("Target Hostname: %s", stdoutBuf.String())
}
return err
}
func SSHAgent() ssh.AuthMethod {
if sshAgent, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK")); err == nil {
return ssh.PublicKeysCallback(agent.NewClient(sshAgent).Signers)
}
return nil
}
func check(e error) {
if e != nil {
panic(e)
}
}

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