iframe-proxy | Sunbelt Computer Software

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package main

import (

"context"

"fmt"

"io"

"net"

"net/http"

"os/exec"

"path/filepath"

"strconv"

"sync"

"testing"

"time"

"github.com/stretchr/testify/require"

"go.coder.com/retry"

"golang.org/x/crypto/ssh"

)

func TestSSHCode(t *testing.T) {

sshPort, err := randomPort()

require.NoError(t, err)

// start up our jank ssh server

defer trassh(t, sshPort).Close()

localPort := randomPortExclude(t, sshPort)

require.NotEmpty(t, localPort)

remotePort := randomPortExclude(t, sshPort, localPort)

require.NotEmpty(t, remotePort)

var wg sync.WaitGroup

wg.Add(1)

go func() {

defer wg.Done()

err := sshCode("foo@127.0.0.1", "", options{

sshFlags: testSSHArgs(sshPort),

bindAddr: net.JoinHostPort("127.0.0.1", localPort),

remotePort: remotePort,

noOpen: true,

})

require.NoError(t, err)

}()

waitForSSHCode(t, localPort, time.Second*30)

waitForSSHCode(t, remotePort, time.Second*30)

// Typically we'd do an os.Stat call here but the os package doesn't expand '~'

out, err := exec.Command("sh", "-l", "-c", "stat "+codeServerPath).CombinedOutput()

require.NoError(t, err, "%s", out)

out, err = exec.Command("pkill", filepath.Base(codeServerPath)).CombinedOutput()

require.NoError(t, err, "%s", out)

wg.Wait()

}

// trassh is an incomplete, local, insecure ssh server

// used for the purpose of testing the implementation without

// requiring the user to have their own remote server.

func trassh(t *testing.T, port string) io.Closer {

private, err := ssh.ParsePrivateKey([]byte(fakeRSAKey))

require.NoError(t, err)

conf := &ssh.ServerConfig{

NoClientAuth: true,

}

conf.AddHostKey(private)

listener, err := net.Listen("tcp", net.JoinHostPort("127.0.0.1", port))

require.NoError(t, err)

go func() {

for {

func() {

conn, err := listener.Accept()

if err != nil {

return

}

defer conn.Close()

sshConn, chans, reqs, err := ssh.NewServerConn(conn, conf)

require.NoError(t, err)

go ssh.DiscardRequests(reqs)

for c := range chans {

switch c.ChannelType() {

case "direct-tcpip":

var req directTCPIPReq

err := ssh.Unmarshal(c.ExtraData(), &req)

if err != nil {

t.Logf("failed to unmarshal tcpip data: %v", err)

continue

}

ch, _, err := c.Accept()

if err != nil {

c.Reject(ssh.ConnectionFailed, fmt.Sprintf("unable to accept channel: %v", err))

continue

}

go handleDirectTCPIP(ch, &req, t)

case "session":

ch, inReqs, err := c.Accept()

if err != nil {

c.Reject(ssh.ConnectionFailed, fmt.Sprintf("unable to accept channel: %v", err))

continue

}

go handleSession(ch, inReqs, t)

default:

t.Logf("unsupported session type: %v\n", c.ChannelType())

c.Reject(ssh.UnknownChannelType, "unknown channel type")

}

sshConn.Wait()

}()

}

}()

return listener

}

func handleDirectTCPIP(ch ssh.Channel, req *directTCPIPReq, t *testing.T) {

defer ch.Close()

dstAddr := net.JoinHostPort(req.Host, strconv.Itoa(int(req.Port)))

conn, err := net.Dial("tcp", dstAddr)

if err != nil {

return

}

defer conn.Close()

var wg sync.WaitGroup

wg.Add(1)

go func() {

defer wg.Done()

defer ch.Close()

io.Copy(ch, conn)

}()

wg.Add(1)

go func() {

defer wg.Done()

defer conn.Close()

io.Copy(conn, ch)

}()

wg.Wait()

}

// execReq describes an exec payload.

type execReq struct {

Command string

}

// directTCPIPReq describes the extra data sent in a

// direct-tcpip request containing the host/port for the ssh server.

type directTCPIPReq struct {

Host string

Port uint32

Orig string

OrigPort uint32

}

// exitStatus describes an 'exit-status' message

// returned after a request.

type exitStatus struct {

Status uint32

}

func handleSession(ch ssh.Channel, in <-chan *ssh.Request, t *testing.T) {

defer ch.Close()

for req := range in {

if req.WantReply {

req.Reply(true, nil)

}

// TODO support the rest of the types e.g. env, pty, etc.

// Right now they aren't necessary for the tests.

if req.Type != "exec" {

t.Logf("Unsupported session type %v, only 'exec' is supported", req.Type)

continue

}

var exReq execReq

err := ssh.Unmarshal(req.Payload, &exReq)

if err != nil {

t.Logf("failed to unmarshal exec payload %s", req.Payload)

return

}

cmd := exec.Command("sh", "-l", "-c", exReq.Command)

stdin, err := cmd.StdinPipe()

require.NoError(t, err)

go func() {

defer stdin.Close()

io.Copy(stdin, ch)

}()

cmd.Stdout = ch

cmd.Stderr = ch.Stderr()

err = cmd.Run()

var exit exitStatus

if err != nil {

exErr, ok := err.(*exec.ExitError)

require.True(t, ok, "Not an exec.ExitError, was %T", err)

exit.Status = uint32(exErr.ExitCode())

}

_, err = ch.SendRequest("exit-status", false, ssh.Marshal(&exit))

if err != nil {

t.Logf("unable to send status: %v", err)

}

break

}

func waitForSSHCode(t *testing.T, port string, timeout time.Duration) {

var (

url = fmt.Sprintf("http://localhost:%v/", port)

client = &http.Client{

Timeout: time.Second,

}

)

ctx, cancel := context.WithTimeout(context.Background(), timeout)

defer cancel()

backoff := &retry.Backoff{

Floor: time.Second,

Ceil: time.Second,

}

for {

resp, err := client.Get(url)

if err == nil {

require.Equal(t, http.StatusOK, resp.StatusCode)

return

}

err = backoff.Wait(ctx)

require.NoError(t, err)

}

// fakeRSAKey isn't used for anything other than the trassh ssh

// server.

const fakeRSAKey = `-----BEGIN RSA PRIVATE KEY-----

MIIEpQIBAAKCAQEAsbbGAxPQeqti2OgdzuMgJGBAwXe/bFhQTPuk0bIvavkZwX/a

NhmXV0dhLino5KtjR8oEazLxOgnOkJ6mpwVEgUhNMZhD9jEHZ7at4DtBIwfxjHjv

nF+kJAt4xX4AZYbwIfLN9TsDGGhv4wPlB7mbwv+lhmPK+HsLbajO4n69k3s0WW94

LafJntx/98o9gL2R7hpbMxgUu8cSZjYakkRBQdab0xUuTiceq0HfAOBCQpEw0meF

cmhMeeu7H5UwKGj573pBxON0G1SJgipkcs4TD2rZ9wjc29gDJjHjf3Ko/JzX1WFL

db21fzqRGWelgCHCUsIvUBeExk4jM1d63JrmFQIDAQABAoIBAQCdc9OSjG6tEMYe

aeFnGQK0V/dnskIOq1xSKK7J/7ZVb+iq8S0Tu67D7IEklos6dsMaqtkpZVQm2OOE

bJw45MjiRn3mUAL+0EfAUzFQtw8qC3Kuw8N/55kVOnjBeba+PUTqvyZNfQBsErP3

Dc9Q/dkMdtZf8HC3oMTqXqMWN7adQBQRBspUBkLQeSemYsUm2cc+YSnCwKel98uN

EuDJaTZwutxTUF1FBoXlejYlVKcldk1w5HtKkjGdW+mbo2xUpu8W0620Rs/fXNpU

+guAlpB1/Wx5foZqZx33Ul8HINfDre/uqHwCd+ucDIyV7TfIh9JV5w3iRLa0QCz0

kFe/GsEtAoGBAODRa1GwfyK+gcgxF2qwfsxF3I+DQhqWFiCA0o5kO2fpiUR3rDQj

XhBoPxr/qYBSBtGErHIiB7WFeQ6GjVTEgY/cEkIIh1tY95UWQ3/oIZWW498dQGRh

SUGXm3lMrSsVCyXxNexSH5yTrRzyZ2u4mZupMeyACoGRGkNTVppOU4XbAoGBAMpc

1ifX3kr5m8CXa6mI+NWFAQlhW0Ak0hjhM/WDzMrSimYxLLSkaKyUSHnFP/8V4asA

tV173lVut2Cjv5v5FcrOnI33Li2IcNlOzCRiLHzZ43HXckcoQDcU8iKTBq1a0Dx1

eXr2rs+a/2pTy7IMsxyJVCSP6IDBI9+2iW+Cxh7PAoGBAMOa0hJAS02yjX7d367v

I1OeETo4jQJOxa/ABfLoGJvfoJQWv5iZkRUbbpSSDytbsx0Gn3eqTiTMnbhar4sq

ckP1yVj0zLhY3wkzVsVp9haOM3ODouvzjWZpf1d5tE2AwLNhfHZCOcjk4EEIU51w

/w1ll89a1ElJM52SXA5jyd3zAoGBAKGtpKi2rvMGFKu+DxWnyu+FUXu2HhrUkEuy

ejn5MMEHj+3v8gDtrnfcDT/FGclrKR7f9QeYtN1bFQYQLkGmtAOSKcC/MVTNwyPL

8gxLp7GkwDSvZq11ekDH6mE3SMluWhtD3Ggi+S4Db3f7NS6vONde3SxNEfz00v2l

MI84U6Q/AoGAVTZGT5weqRTJSqnri6Noz+5j/73QMf/QiZDgHMMCF0giC2mxqOgR

QF6+cxHQe0sbMQ/xJU5RYhgnqSa2TjLMju4N2nQ9i/HqI/3p0CPwjFsZWlXmWEK9

5kdld52W7Bu2vQuFbg2Oy7aPhnI+1CqlubOFRgMe4AJND2t9SMTV+rc=

-----END RSA PRIVATE KEY-----

func testSSHArgs(port string) string {

return "-o StrictHostKeyChecking=no -p " + port

}

func randomPortExclude(t *testing.T, exludedPorts ...string) string {

valid := func(port string) bool {

for _, exPort := range exludedPorts {

if exPort == port {

return false

}

return true

}

maxTries := 10

for i := 0; i < maxTries; i++ {

port, err := randomPort()

require.NoError(t, err)

if valid(port) {

return port

}

return ""

}

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