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SSH tunnelling in Golang
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package main | |
import ( | |
"log" | |
"bufio" | |
"time" | |
"os" | |
"fmt" | |
"io" | |
"net" | |
"golang.org/x/crypto/ssh" | |
"golang.org/x/crypto/ssh/agent" | |
) | |
type Endpoint struct { | |
Host string | |
Port int | |
} | |
func (endpoint *Endpoint) String() string { | |
return fmt.Sprintf("%s:%d", endpoint.Host, endpoint.Port) | |
} | |
type SSHtunnel struct { | |
Local *Endpoint | |
Server *Endpoint | |
Remote *Endpoint | |
Config *ssh.ClientConfig | |
} | |
func (tunnel *SSHtunnel) Start() error { | |
listener, err := net.Listen("tcp", tunnel.Local.String()) | |
if err != nil { | |
return err | |
} | |
defer listener.Close() | |
for { | |
conn, err := listener.Accept() | |
if err != nil { | |
return err | |
} | |
go tunnel.forward(conn) | |
} | |
} | |
func (tunnel *SSHtunnel) forward(localConn net.Conn) { | |
serverConn, err := ssh.Dial("tcp", tunnel.Server.String(), tunnel.Config) | |
if err != nil { | |
fmt.Printf("Server dial error: %s\n", err) | |
return | |
} | |
remoteConn, err := serverConn.Dial("tcp", tunnel.Remote.String()) | |
if err != nil { | |
fmt.Printf("Remote dial error: %s\n", err) | |
return | |
} | |
copyConn:=func(writer, reader net.Conn) { | |
defer writer.Close() | |
defer reader.Close() | |
_, err:= io.Copy(writer, reader) | |
if err != nil { | |
fmt.Printf("io.Copy error: %s", err) | |
} | |
} | |
go copyConn(localConn, remoteConn) | |
go copyConn(remoteConn, localConn) | |
} | |
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 main() { | |
localEndpoint := &Endpoint{ | |
Host: "localhost", | |
Port: 9000, | |
} | |
serverEndpoint := &Endpoint{ | |
Host: "example.com", | |
Port: 22, | |
} | |
remoteEndpoint := &Endpoint{ | |
Host: "localhost", | |
Port: 8080, | |
} | |
sshConfig := &ssh.ClientConfig{ | |
User: "vcap", | |
Auth: []ssh.AuthMethod{ | |
SSHAgent(), | |
}, | |
} | |
tunnel := &SSHtunnel{ | |
Config: sshConfig, | |
Local: localEndpoint, | |
Server: serverEndpoint, | |
Remote: remoteEndpoint, | |
} | |
tunnel.Start() | |
} |
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An example how tu use to connect aws documentdb ?
It needs to pass ssl pem file + pem for connecting to ssh