/usr/share/gocode/src/github.com/pkg/sftp/server_integration_test.go is in golang-github-pkg-sftp-dev 0.0~git20160930.0.4d0e916-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// sftp server integration tests
// enable with -integration
// example invokation (darwin): gofmt -w `find . -name \*.go` && (cd server_standalone/ ; go build -tags debug) && go test -tags debug github.com/pkg/sftp -integration -v -sftp /usr/libexec/sftp-server -run ServerCompareSubsystems
import (
"bytes"
"encoding/hex"
"flag"
"fmt"
"io/ioutil"
"math/rand"
"net"
"os"
"os/exec"
"path"
"path/filepath"
"regexp"
"strconv"
"strings"
"testing"
"time"
"github.com/kr/fs"
"golang.org/x/crypto/ssh"
)
var testSftpClientBin = flag.String("sftp_client", "/usr/bin/sftp", "location of the sftp client binary")
var sshServerDebugStream = ioutil.Discard
var sftpServerDebugStream = ioutil.Discard
var sftpClientDebugStream = ioutil.Discard
const (
GOLANG_SFTP = true
OPENSSH_SFTP = false
)
var (
hostPrivateKeySigner ssh.Signer
privKey = []byte(`
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
`)
)
func init() {
var err error
hostPrivateKeySigner, err = ssh.ParsePrivateKey(privKey)
if err != nil {
panic(err)
}
}
func keyAuth(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
permissions := &ssh.Permissions{
CriticalOptions: map[string]string{},
Extensions: map[string]string{},
}
return permissions, nil
}
func pwAuth(conn ssh.ConnMetadata, pw []byte) (*ssh.Permissions, error) {
permissions := &ssh.Permissions{
CriticalOptions: map[string]string{},
Extensions: map[string]string{},
}
return permissions, nil
}
func basicServerConfig() *ssh.ServerConfig {
config := ssh.ServerConfig{
Config: ssh.Config{
MACs: []string{"hmac-sha1"},
},
PasswordCallback: pwAuth,
PublicKeyCallback: keyAuth,
}
config.AddHostKey(hostPrivateKeySigner)
return &config
}
type sshServer struct {
useSubsystem bool
conn net.Conn
config *ssh.ServerConfig
sshConn *ssh.ServerConn
newChans <-chan ssh.NewChannel
newReqs <-chan *ssh.Request
}
func sshServerFromConn(conn net.Conn, useSubsystem bool, config *ssh.ServerConfig) (*sshServer, error) {
// From a standard TCP connection to an encrypted SSH connection
sshConn, newChans, newReqs, err := ssh.NewServerConn(conn, config)
if err != nil {
return nil, err
}
svr := &sshServer{useSubsystem, conn, config, sshConn, newChans, newReqs}
svr.listenChannels()
return svr, nil
}
func (svr *sshServer) Wait() error {
return svr.sshConn.Wait()
}
func (svr *sshServer) Close() error {
return svr.sshConn.Close()
}
func (svr *sshServer) listenChannels() {
go func() {
for chanReq := range svr.newChans {
go svr.handleChanReq(chanReq)
}
}()
go func() {
for req := range svr.newReqs {
go svr.handleReq(req)
}
}()
}
func (svr *sshServer) handleReq(req *ssh.Request) {
switch req.Type {
default:
rejectRequest(req)
}
}
type sshChannelServer struct {
svr *sshServer
chanReq ssh.NewChannel
ch ssh.Channel
newReqs <-chan *ssh.Request
}
type sshSessionChannelServer struct {
*sshChannelServer
env []string
}
func (svr *sshServer) handleChanReq(chanReq ssh.NewChannel) {
fmt.Fprintf(sshServerDebugStream, "channel request: %v, extra: '%v'\n", chanReq.ChannelType(), hex.EncodeToString(chanReq.ExtraData()))
switch chanReq.ChannelType() {
case "session":
if ch, reqs, err := chanReq.Accept(); err != nil {
fmt.Fprintf(sshServerDebugStream, "fail to accept channel request: %v\n", err)
chanReq.Reject(ssh.ResourceShortage, "channel accept failure")
} else {
chsvr := &sshSessionChannelServer{
sshChannelServer: &sshChannelServer{svr, chanReq, ch, reqs},
env: append([]string{}, os.Environ()...),
}
chsvr.handle()
}
default:
chanReq.Reject(ssh.UnknownChannelType, "channel type is not a session")
}
}
func (chsvr *sshSessionChannelServer) handle() {
// should maybe do something here...
go chsvr.handleReqs()
}
func (chsvr *sshSessionChannelServer) handleReqs() {
for req := range chsvr.newReqs {
chsvr.handleReq(req)
}
fmt.Fprintf(sshServerDebugStream, "ssh server session channel complete\n")
}
func (chsvr *sshSessionChannelServer) handleReq(req *ssh.Request) {
switch req.Type {
case "env":
chsvr.handleEnv(req)
case "subsystem":
chsvr.handleSubsystem(req)
default:
rejectRequest(req)
}
}
func rejectRequest(req *ssh.Request) error {
fmt.Fprintf(sshServerDebugStream, "ssh rejecting request, type: %s\n", req.Type)
err := req.Reply(false, []byte{})
if err != nil {
fmt.Fprintf(sshServerDebugStream, "ssh request reply had error: %v\n", err)
}
return err
}
func rejectRequestUnmarshalError(req *ssh.Request, s interface{}, err error) error {
fmt.Fprintf(sshServerDebugStream, "ssh request unmarshaling error, type '%T': %v\n", s, err)
rejectRequest(req)
return err
}
// env request form:
type sshEnvRequest struct {
Envvar string
Value string
}
func (chsvr *sshSessionChannelServer) handleEnv(req *ssh.Request) error {
envReq := &sshEnvRequest{}
if err := ssh.Unmarshal(req.Payload, envReq); err != nil {
return rejectRequestUnmarshalError(req, envReq, err)
}
req.Reply(true, nil)
found := false
for i, envstr := range chsvr.env {
if strings.HasPrefix(envstr, envReq.Envvar+"=") {
found = true
chsvr.env[i] = envReq.Envvar + "=" + envReq.Value
}
}
if !found {
chsvr.env = append(chsvr.env, envReq.Envvar+"="+envReq.Value)
}
return nil
}
// Payload: int: command size, string: command
type sshSubsystemRequest struct {
Name string
}
type sshSubsystemExitStatus struct {
Status uint32
}
func (chsvr *sshSessionChannelServer) handleSubsystem(req *ssh.Request) error {
defer func() {
err1 := chsvr.ch.CloseWrite()
err2 := chsvr.ch.Close()
fmt.Fprintf(sshServerDebugStream, "ssh server subsystem request complete, err: %v %v\n", err1, err2)
}()
subsystemReq := &sshSubsystemRequest{}
if err := ssh.Unmarshal(req.Payload, subsystemReq); err != nil {
return rejectRequestUnmarshalError(req, subsystemReq, err)
}
// reply to the ssh client
// no idea if this is actually correct spec-wise.
// just enough for an sftp server to start.
if subsystemReq.Name != "sftp" {
return req.Reply(false, nil)
}
req.Reply(true, nil)
if !chsvr.svr.useSubsystem {
// use the openssh sftp server backend; this is to test the ssh code, not the sftp code,
// or is used for comparison between our sftp subsystem and the openssh sftp subsystem
cmd := exec.Command(*testSftp, "-e", "-l", "DEBUG") // log to stderr
cmd.Stdin = chsvr.ch
cmd.Stdout = chsvr.ch
cmd.Stderr = sftpServerDebugStream
if err := cmd.Start(); err != nil {
return err
}
return cmd.Wait()
}
sftpServer, err := NewServer(
chsvr.ch,
WithDebug(sftpServerDebugStream),
)
if err != nil {
return err
}
// wait for the session to close
runErr := sftpServer.Serve()
exitStatus := uint32(1)
if runErr == nil {
exitStatus = uint32(0)
}
_, exitStatusErr := chsvr.ch.SendRequest("exit-status", false, ssh.Marshal(sshSubsystemExitStatus{exitStatus}))
return exitStatusErr
}
// starts an ssh server to test. returns: host string and port
func testServer(t *testing.T, useSubsystem bool, readonly bool) (net.Listener, string, int) {
if !*testIntegration {
t.Skip("skipping intergration test")
}
listener, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
host, portStr, err := net.SplitHostPort(listener.Addr().String())
if err != nil {
t.Fatal(err)
}
port, err := strconv.Atoi(portStr)
if err != nil {
t.Fatal(err)
}
go func() {
for {
conn, err := listener.Accept()
if err != nil {
fmt.Fprintf(sshServerDebugStream, "ssh server socket closed: %v\n", err)
break
}
go func() {
defer conn.Close()
sshSvr, err := sshServerFromConn(conn, useSubsystem, basicServerConfig())
if err != nil {
t.Error(err)
return
}
err = sshSvr.Wait()
fmt.Fprintf(sshServerDebugStream, "ssh server finished, err: %v\n", err)
}()
}
}()
return listener, host, port
}
func runSftpClient(t *testing.T, script string, path string, host string, port int) (string, error) {
// if sftp client binary is unavailable, skip test
if _, err := os.Stat(*testSftpClientBin); err != nil {
t.Skip("sftp client binary unavailable")
}
args := []string{
// "-vvvv",
"-b", "-",
"-o", "StrictHostKeyChecking=no",
"-o", "LogLevel=ERROR",
"-o", "UserKnownHostsFile /dev/null",
"-P", fmt.Sprintf("%d", port), fmt.Sprintf("%s:%s", host, path),
}
cmd := exec.Command(*testSftpClientBin, args...)
var stdout bytes.Buffer
cmd.Stdin = bytes.NewBufferString(script)
cmd.Stdout = &stdout
cmd.Stderr = sftpClientDebugStream
if err := cmd.Start(); err != nil {
return "", err
}
err := cmd.Wait()
return string(stdout.Bytes()), err
}
func TestServerCompareSubsystems(t *testing.T) {
listenerGo, hostGo, portGo := testServer(t, GOLANG_SFTP, READONLY)
listenerOp, hostOp, portOp := testServer(t, OPENSSH_SFTP, READONLY)
defer listenerGo.Close()
defer listenerOp.Close()
script := `
ls /
ls -l /
ls /dev/
ls -l /dev/
ls -l /etc/
ls -l /bin/
ls -l /usr/bin/
`
outputGo, err := runSftpClient(t, script, "/", hostGo, portGo)
if err != nil {
t.Fatal(err)
}
outputOp, err := runSftpClient(t, script, "/", hostOp, portOp)
if err != nil {
t.Fatal(err)
}
newlineRegex := regexp.MustCompile(`\r*\n`)
spaceRegex := regexp.MustCompile(`\s+`)
outputGoLines := newlineRegex.Split(outputGo, -1)
outputOpLines := newlineRegex.Split(outputOp, -1)
for i, goLine := range outputGoLines {
if i > len(outputOpLines) {
t.Fatalf("output line count differs")
}
opLine := outputOpLines[i]
bad := false
if goLine != opLine {
goWords := spaceRegex.Split(goLine, -1)
opWords := spaceRegex.Split(opLine, -1)
// allow words[2] and [3] to be different as these are users & groups
// also allow words[1] to differ as the link count for directories like
// proc is unstable during testing as processes are created/destroyed.
for j, goWord := range goWords {
if j > len(opWords) {
bad = true
}
opWord := opWords[j]
if goWord != opWord && j != 1 && j != 2 && j != 3 {
bad = true
}
}
}
if bad {
t.Errorf("outputs differ, go:\n%v\nopenssh:\n%v\n", goLine, opLine)
}
}
}
var rng = rand.New(rand.NewSource(time.Now().Unix()))
func randData(length int) []byte {
data := make([]byte, length)
for i := 0; i < length; i++ {
data[i] = byte(rng.Uint32())
}
return data
}
func randName() string {
return "sftp." + hex.EncodeToString(randData(16))
}
func TestServerMkdirRmdir(t *testing.T) {
listenerGo, hostGo, portGo := testServer(t, GOLANG_SFTP, READONLY)
defer listenerGo.Close()
tmpDir := "/tmp/" + randName()
defer os.RemoveAll(tmpDir)
// mkdir remote
if _, err := runSftpClient(t, "mkdir "+tmpDir, "/", hostGo, portGo); err != nil {
t.Fatal(err)
}
// directory should now exist
if _, err := os.Stat(tmpDir); err != nil {
t.Fatal(err)
}
// now remove the directory
if _, err := runSftpClient(t, "rmdir "+tmpDir, "/", hostGo, portGo); err != nil {
t.Fatal(err)
}
if _, err := os.Stat(tmpDir); err == nil {
t.Fatal("should have error after deleting the directory")
}
}
func TestServerSymlink(t *testing.T) {
listenerGo, hostGo, portGo := testServer(t, GOLANG_SFTP, READONLY)
defer listenerGo.Close()
link := "/tmp/" + randName()
defer os.RemoveAll(link)
// now create a symbolic link within the new directory
if output, err := runSftpClient(t, "symlink /bin/sh "+link, "/", hostGo, portGo); err != nil {
t.Fatalf("failed: %v %v", err, string(output))
}
// symlink should now exist
if stat, err := os.Lstat(link); err != nil {
t.Fatal(err)
} else if (stat.Mode() & os.ModeSymlink) != os.ModeSymlink {
t.Fatalf("is not a symlink: %v", stat.Mode())
}
}
func TestServerPut(t *testing.T) {
listenerGo, hostGo, portGo := testServer(t, GOLANG_SFTP, READONLY)
defer listenerGo.Close()
tmpFileLocal := "/tmp/" + randName()
tmpFileRemote := "/tmp/" + randName()
defer os.RemoveAll(tmpFileLocal)
defer os.RemoveAll(tmpFileRemote)
t.Logf("put: local %v remote %v", tmpFileLocal, tmpFileRemote)
// create a file with random contents. This will be the local file pushed to the server
tmpFileLocalData := randData(10 * 1024 * 1024)
if err := ioutil.WriteFile(tmpFileLocal, tmpFileLocalData, 0644); err != nil {
t.Fatal(err)
}
// sftp the file to the server
if output, err := runSftpClient(t, "put "+tmpFileLocal+" "+tmpFileRemote, "/", hostGo, portGo); err != nil {
t.Fatalf("runSftpClient failed: %v, output\n%v\n", err, output)
}
// tmpFile2 should now exist, with the same contents
if tmpFileRemoteData, err := ioutil.ReadFile(tmpFileRemote); err != nil {
t.Fatal(err)
} else if string(tmpFileLocalData) != string(tmpFileRemoteData) {
t.Fatal("contents of file incorrect after put")
}
}
func TestServerGet(t *testing.T) {
listenerGo, hostGo, portGo := testServer(t, GOLANG_SFTP, READONLY)
defer listenerGo.Close()
tmpFileLocal := "/tmp/" + randName()
tmpFileRemote := "/tmp/" + randName()
defer os.RemoveAll(tmpFileLocal)
defer os.RemoveAll(tmpFileRemote)
t.Logf("get: local %v remote %v", tmpFileLocal, tmpFileRemote)
// create a file with random contents. This will be the remote file pulled from the server
tmpFileRemoteData := randData(10 * 1024 * 1024)
if err := ioutil.WriteFile(tmpFileRemote, tmpFileRemoteData, 0644); err != nil {
t.Fatal(err)
}
// sftp the file to the server
if output, err := runSftpClient(t, "get "+tmpFileRemote+" "+tmpFileLocal, "/", hostGo, portGo); err != nil {
t.Fatalf("runSftpClient failed: %v, output\n%v\n", err, output)
}
// tmpFile2 should now exist, with the same contents
if tmpFileLocalData, err := ioutil.ReadFile(tmpFileLocal); err != nil {
t.Fatal(err)
} else if string(tmpFileLocalData) != string(tmpFileRemoteData) {
t.Fatal("contents of file incorrect after put")
}
}
func compareDirectoriesRecursive(t *testing.T, aroot, broot string) {
walker := fs.Walk(aroot)
for walker.Step() {
if err := walker.Err(); err != nil {
t.Fatal(err)
}
// find paths
aPath := walker.Path()
aRel, err := filepath.Rel(aroot, aPath)
if err != nil {
t.Fatalf("could not find relative path for %v: %v", aPath, err)
}
bPath := path.Join(broot, aRel)
if aRel == "." {
continue
}
//t.Logf("comparing: %v a: %v b %v", aRel, aPath, bPath)
// if a is a link, the sftp recursive copy won't have copied it. ignore
aLink, err := os.Lstat(aPath)
if err != nil {
t.Fatalf("could not lstat %v: %v", aPath, err)
}
if aLink.Mode()&os.ModeSymlink != 0 {
continue
}
// stat the files
aFile, err := os.Stat(aPath)
if err != nil {
t.Fatalf("could not stat %v: %v", aPath, err)
}
bFile, err := os.Stat(bPath)
if err != nil {
t.Fatalf("could not stat %v: %v", bPath, err)
}
// compare stats, with some leniency for the timestamp
if aFile.Mode() != bFile.Mode() {
t.Fatalf("modes different for %v: %v vs %v", aRel, aFile.Mode(), bFile.Mode())
}
if !aFile.IsDir() {
if aFile.Size() != bFile.Size() {
t.Fatalf("sizes different for %v: %v vs %v", aRel, aFile.Size(), bFile.Size())
}
}
timeDiff := aFile.ModTime().Sub(bFile.ModTime())
if timeDiff > time.Second || timeDiff < -time.Second {
t.Fatalf("mtimes different for %v: %v vs %v", aRel, aFile.ModTime(), bFile.ModTime())
}
// compare contents
if !aFile.IsDir() {
if aContents, err := ioutil.ReadFile(aPath); err != nil {
t.Fatal(err)
} else if bContents, err := ioutil.ReadFile(bPath); err != nil {
t.Fatal(err)
} else if string(aContents) != string(bContents) {
t.Fatalf("contents different for %v", aRel)
}
}
}
}
func TestServerPutRecursive(t *testing.T) {
listenerGo, hostGo, portGo := testServer(t, GOLANG_SFTP, READONLY)
defer listenerGo.Close()
dirLocal, err := os.Getwd()
if err != nil {
t.Fatal(err)
}
tmpDirRemote := "/tmp/" + randName()
defer os.RemoveAll(tmpDirRemote)
t.Logf("put recursive: local %v remote %v", dirLocal, tmpDirRemote)
// push this directory (source code etc) recursively to the server
if output, err := runSftpClient(t, "mkdir "+tmpDirRemote+"\r\nput -r -P "+dirLocal+"/ "+tmpDirRemote+"/", "/", hostGo, portGo); err != nil {
t.Fatalf("runSftpClient failed: %v, output\n%v\n", err, output)
}
compareDirectoriesRecursive(t, dirLocal, path.Join(tmpDirRemote, path.Base(dirLocal)))
}
func TestServerGetRecursive(t *testing.T) {
listenerGo, hostGo, portGo := testServer(t, GOLANG_SFTP, READONLY)
defer listenerGo.Close()
dirRemote, err := os.Getwd()
if err != nil {
t.Fatal(err)
}
tmpDirLocal := "/tmp/" + randName()
defer os.RemoveAll(tmpDirLocal)
t.Logf("get recursive: local %v remote %v", tmpDirLocal, dirRemote)
// pull this directory (source code etc) recursively from the server
if output, err := runSftpClient(t, "lmkdir "+tmpDirLocal+"\r\nget -r -P "+dirRemote+"/ "+tmpDirLocal+"/", "/", hostGo, portGo); err != nil {
t.Fatalf("runSftpClient failed: %v, output\n%v\n", err, output)
}
compareDirectoriesRecursive(t, dirRemote, path.Join(tmpDirLocal, path.Base(dirRemote)))
}
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