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ftp-test.go
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ftp-test.go
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package main
import (
"bufio"
"bytes"
"crypto/md5"
"fmt"
"log"
"net"
"strings"
"time"
)
func listenForFTPDataConnections(address string) {
l, err := net.Listen("tcp", address)
if err != nil {
log.Fatalf("Failed to listen for FTP, %s", err.Error())
}
failures := 0
for {
c, err := l.Accept()
if err != nil {
failures++
if failures == 10 {
log.Fatalf("Failing to listen on FTP connections anymore")
}
time.Sleep(time.Millisecond * 700)
continue
}
go handleFTPDataconnection(c)
}
}
func handleFTPDataconnection(c net.Conn) {
vm := locateVM(c.RemoteAddr().String())
if vm == nil {
log.Printf("Unable to locate source of the connection")
c.Close()
return
}
defer c.Close()
if vm.TestAssigned != "FTPGET" && vm.TestAssigned != "FTPUPLOAD" {
return
}
if vm.TestAssigned == "FTPUPLOAD" {
buffer := make([]byte, 600*1024) // max buffer size of 600kb
buf := bytes.NewBuffer(buffer)
bytesWritten := 0
for {
tbuf := make([]byte, 1500)
n, err := c.Read(tbuf)
if err != nil {
break
}
bytesWritten += n
if bytesWritten > 600*1024 {
punishFailedAttempt(vm)
log.Printf("Attempted DoS")
return
}
buf.Write(tbuf[:n])
}
bhash := md5.Sum(buf.Bytes())
hash := fmt.Sprintf("%x", bhash)
if strings.ToLower(hash) == "8eb42d34c5744458fde534facdfe7869" {
vm.TestComplete <- true
vm.TestComplete <- true
} else {
log.Printf("Not expected data: got %x vs 8eb42d34c5744458fde534facdfe7869", bhash)
return
}
}
// Sink all data
go func() {
for {
b := make([]byte, 10000)
_, err := c.Read(b)
if err != nil {
c.Close()
return
}
}
}()
timeout := time.NewTicker(time.Second * 20)
select {
case _ = <-vm.TestComplete:
return
case _ = <-timeout.C:
return
}
}
func listenForFTPConnections(address string) {
l, err := net.Listen("tcp", address)
if err != nil {
log.Fatalf("Failed to listen for FTP, %s", err.Error())
}
failures := 0
for {
c, err := l.Accept()
if err != nil {
failures++
if failures == 10 {
log.Fatalf("Failing to listen on FTP connections anymore")
}
time.Sleep(time.Millisecond * 700)
continue
}
go ftpHandleConnection(c)
}
}
func punishFailedAttempt(vmo *vm) {
vmo.FailedAttempts++
}
func ftpHandleConnection(c net.Conn) {
vm := locateVM(c.RemoteAddr().String())
if vm == nil {
log.Printf("Unable to locate source of the connection")
c.Close()
return
}
defer c.Close()
if vm.TestAssigned != "FTPGET" && vm.TestAssigned != "FTPUPLOAD" {
return
}
defer punishFailedAttempt(vm)
r, err := writeAndReadLine(c, "220 BnBlog 1.0 Server (test.arpa) [::ffff:127.0.0.1]\n")
if err != nil || !strings.HasPrefix(r, "USER ") {
return
}
r, err = writeAndReadLine(c, "331 Anonymous login ok, send your complete email address as your password\n")
if err != nil || !strings.HasPrefix(r, "PASS ") {
return
}
r, err = writeAndReadLine(c, "230 Anonymous access granted, restrictions apply\n")
if err != nil || !strings.HasPrefix(r, "PWD") {
return
}
if vm.TestAssigned == "FTPGET" {
/*
> 220 ProFTPD 1.3.3g Server (ftp.arin.net) [::ffff:199.212.0.151]
< USER anonymous
> 331 Anonymous login ok, send your complete email address as your password
< PASS ftp@example.com
> 230 Anonymous access granted, restrictions apply
< PWD
> 257 "/" is the current directory
< CWD info
250 CWD command successful
< CWD current
250 CWD command successful
< EPSV
229 Entering Extended Passive Mode (|||59681|)
< TYPE I
200 Type set to I
< SIZE asn.txt
213 13859350
< RETR asn.txt
150 Opening BINARY mode data connection for asn.txt (13859350 bytes)
451 Transfer aborted. Broken pipe
*/
r, err = writeAndReadLine(c, "257 \"/\" is the current directory\n")
if err != nil {
return
}
for {
if strings.HasPrefix(r, "CWD ") {
r, err = writeAndReadLine(c, "250 CWD command successful\n")
if err != nil {
return
}
continue
}
if strings.HasPrefix(r, "EPSV") {
// vm.TestAssigned = "PASSIVE-FTPGET"
r, err = writeAndReadLine(c, "229 Entering Extended Passive Mode (|||1337|)\n")
if err != nil {
return
}
continue
}
if strings.HasPrefix(r, "TYPE ") {
r, err = writeAndReadLine(c, "200 Type set to I\n")
if err != nil {
return
}
continue
}
if strings.HasPrefix(r, "SIZE ") {
r, err = writeAndReadLine(c, "213 800\n")
if err != nil {
return
}
continue
}
if strings.HasPrefix(r, "RETR hello.tx") {
vm.TestComplete <- true
vm.TestComplete <- true
return
}
return
}
} else {
// UPLOAD
/*
220 Service Ready.
USER bentest
331 Username ok, need password
PASS xxxx
230 User logged in
PWD
257 "/bentest/" is current directory.
EPSV
502 Command not implemented
PASV
227 Entering Passive Mode (x,x,x,x,x,x)
TYPE I
200 Type set to Image
STOR test
150 Opening Passive mode data transfer for STOR
226 Closing data connection, file transfer successful
QUIT
221 Service closing control connection
BYE
*/
r, err = writeAndReadLine(c, "257 \"/\" is the current directory\n")
if err != nil {
return
}
for {
if strings.HasPrefix(r, "CWD ") {
r, err = writeAndReadLine(c, "250 CWD command successful\n")
if err != nil {
return
}
continue
}
if strings.HasPrefix(r, "EPSV") {
// vm.TestAssigned = "PASSIVE-FTPGET"
r, err = writeAndReadLine(c, "229 Entering Extended Passive Mode (|||1337|)\n")
if err != nil {
return
}
continue
}
if strings.HasPrefix(r, "TYPE ") {
r, err = writeAndReadLine(c, "200 Type set to I\n")
if err != nil {
return
}
continue
}
if strings.HasPrefix(r, "SIZE ") {
r, err = writeAndReadLine(c, "213 800\n")
if err != nil {
return
}
continue
}
if strings.HasPrefix(r, "STOR curl") {
c.Write([]byte("150 SGTM\n"))
time.Sleep(time.Second * 4)
return
}
return
}
}
}
func writeAndReadLine(c net.Conn, write string) (s string, err error) {
_, err = c.Write([]byte(write))
if err != nil {
return "", err
}
bio := bufio.NewReader(c)
bline, tooBig, err := bio.ReadLine()
if tooBig {
log.Printf("Line is too big to buffer, things are likely about to go south now")
}
if err != nil {
return "", err
}
return string(bline), nil
}