/
ftp.go
274 lines (240 loc) · 5.21 KB
/
ftp.go
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// Copyright 2017-2021 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
// Under the terms of Contract DE-NA0003525 with NTESS, the U.S. Government retains certain
// rights in this software.
package main
import (
"bytes"
"crypto/tls"
"image"
"image/png"
"io"
"io/ioutil"
"math"
"math/rand"
"net"
"strconv"
"time"
log "github.com/sandia-minimega/minimega/v2/pkg/minilog"
"github.com/dutchcoders/goftp"
"github.com/goftp/server"
)
const (
COMMAND_PORT = 21
FILE_PATH = ""
USER = "anonymous"
PASS = "anonymous"
SERVER_NAME = "protoFTP"
)
var (
goftpServer *server.Server
useTLS = false
tlsAuth = false
connected = false
auth = false
FTPImage []byte
)
type FTPAuth struct{}
func (a FTPAuth) CheckPasswd(user, pass string) (bool, error) {
return true, nil
}
func ftpClient() {
var ftp *goftp.FTP
var err error
rand.Seed(time.Now().UnixNano())
t := NewEventTicker(*f_mean, *f_stddev, *f_min, *f_max)
for {
t.Tick()
// Connect to a host
if !connected {
h, o := randomHost()
log.Debug("ftp host %v from %v", h, o)
host := h + ":" + strconv.Itoa(COMMAND_PORT)
if ftp, err = goftp.Connect(host); err != nil {
log.Errorln(err)
} else {
ftp.HitCallback(updateHitCount)
connected = true
log.Debug("Connected to host")
}
continue
}
// Authenticate
if !auth {
if err = ftp.Login(USER, PASS); err != nil {
log.Errorln(err)
} else {
auth = true
log.Debug("Logged in as %v", USER)
}
continue
}
// TLS Auth
if useTLS && !tlsAuth {
var version uint16
if *f_tlsVersion != "" {
switch *f_tlsVersion {
case "tls1.0":
version = tls.VersionTLS10
case "tls1.1":
version = tls.VersionTLS11
case "tls1.2":
version = tls.VersionTLS12
}
}
tlsConfig := &tls.Config{
InsecureSkipVerify: true,
MinVersion: tls.VersionSSL30,
MaxVersion: version,
}
if err = ftp.AuthTLS(tlsConfig); err != nil {
log.Errorln(err)
ftpQuit(ftp)
} else {
tlsAuth = true
}
log.Debug("TLS auth ok")
continue
}
// Random ftp actions
if connected && auth {
switch rand.Intn(6) {
case 0:
// get current path
var curpath string
if curpath, err = ftp.Pwd(); err != nil {
log.Errorln(err)
}
log.Debug("Current path: %v", curpath)
case 1:
// get system type of remote host
var syst string
if syst, err = ftp.Syst(); err != nil {
log.Errorln(err)
}
log.Debug("System: %v", syst)
case 2:
// Get the filesize of the protonuke binary
var size int
if size, err = ftp.Size("/tmp/ftpimage"); err != nil {
log.Errorln(err)
}
log.Debug("ftpimage file size: %v", size)
case 3:
// get directory listing
var files []string
if files, err = ftp.List("/tmp"); err != nil {
log.Errorln(err)
}
log.Debug("Directory listing: %v", files)
case 4:
// request file transfer
var s string
var retrfunc func(io.Reader) error
retrfunc = func(r io.Reader) error {
_, err := io.Copy(ioutil.Discard, r)
return err
}
if s, err = ftp.Retr("/tmp/ftpimage", retrfunc); err != nil {
log.Errorln(err)
}
log.Debug("Retr: %v", s)
case 5:
// quit
ftpQuit(ftp)
log.Debug("Logged out")
}
}
}
}
func ftpsClient() {
useTLS = true
ftpClient()
}
func ftpQuit(ftp *goftp.FTP) {
// close connection
if err := ftp.Quit(); err != nil {
log.Errorln(err)
}
connected = false
auth = false
tlsAuth = false
}
func updateHitCount() {
if useTLS {
ftpTLSReportChan <- 1
} else {
ftpReportChan <- 1
}
}
func ftpServer() {
ftpMakeImage()
var factory server.DriverFactory
perm := server.NewSimplePerm(USER, PASS)
factory = &FileDriverFactory{
FILE_PATH,
perm,
}
auth := FTPAuth{}
// Get our ip address for PASV connection
var ipv4 net.IP
ifaces, err := net.Interfaces()
if err != nil {
log.Errorln(err)
}
for _, i := range ifaces {
addrs, err := i.Addrs()
if err != nil {
log.Errorln(err)
}
for _, addr := range addrs {
ipnet, ok := addr.(*net.IPNet)
if ok && !ipnet.IP.IsLoopback() {
if ip := ipnet.IP.To4(); ip != nil {
ipv4 = ip
}
}
}
}
if ipv4 == nil {
log.Fatal("Unable to determine local IP for PASV connection.")
}
cert, key := generateCerts()
opt := &server.ServerOpts{
Factory: factory,
Auth: auth,
Name: SERVER_NAME,
PublicIp: ipv4.String(),
PassivePorts: "",
Port: COMMAND_PORT,
TLS: useTLS,
CertFile: cert,
KeyFile: key,
ExplicitFTPS: useTLS,
HitFunc: updateHitCount,
}
goftpServer = server.NewServer(opt)
go func() {
err := goftpServer.ListenAndServe()
if err != nil {
log.Error("Error starting server: %v", err)
}
}()
}
func ftpsServer() {
useTLS = true
ftpServer()
}
func ftpMakeImage() {
s := rand.NewSource(time.Now().UnixNano())
r := rand.New(s)
pixelcount := f_ftpFileSize / 4
side := int(math.Sqrt(float64(pixelcount)))
log.Debug("Image served will be %v by %v", side, side)
m := image.NewRGBA(image.Rect(0, 0, side, side))
for i := 0; i < len(m.Pix); i++ {
m.Pix[i] = uint8(r.Int())
}
buf := new(bytes.Buffer)
png.Encode(buf, m)
FTPImage = buf.Bytes()
}