/
syn_scan.go
218 lines (177 loc) · 4.92 KB
/
syn_scan.go
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package modules
import (
"fmt"
"net"
"strconv"
"sync"
"time"
"github.com/bettercap/bettercap/core"
"github.com/bettercap/bettercap/log"
"github.com/bettercap/bettercap/network"
"github.com/bettercap/bettercap/packets"
"github.com/bettercap/bettercap/session"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/malfunkt/iprange"
)
const synSourcePort = 666
type SynScanner struct {
session.SessionModule
addresses []net.IP
startPort int
endPort int
waitGroup *sync.WaitGroup
}
func NewSynScanner(s *session.Session) *SynScanner {
ss := &SynScanner{
SessionModule: session.NewSessionModule("syn.scan", s),
addresses: make([]net.IP, 0),
startPort: 0,
endPort: 0,
waitGroup: &sync.WaitGroup{},
}
ss.AddHandler(session.NewModuleHandler("syn.scan IP-RANGE [START-PORT] [END-PORT]", "syn.scan ([^\\s]+) ?(\\d+)?([\\s\\d]*)?",
"Perform a syn port scanning against an IP address within the provided ports range.",
func(args []string) error {
if ss.Running() == true {
return fmt.Errorf("A scan is already running, wait for it to end before starting a new one.")
}
list, err := iprange.Parse(args[0])
if err != nil {
return fmt.Errorf("Error while parsing IP range '%s': %s", args[0], err)
}
argc := len(args)
ss.addresses = list.Expand()
ss.startPort = 1
ss.endPort = 65535
if argc > 1 && core.Trim(args[1]) != "" {
if ss.startPort, err = strconv.Atoi(core.Trim(args[1])); err != nil {
return fmt.Errorf("Invalid START-PORT: %s", err)
}
if ss.startPort > 65535 {
ss.startPort = 65535
}
ss.endPort = ss.startPort
}
if argc > 2 && core.Trim(args[2]) != "" {
if ss.endPort, err = strconv.Atoi(core.Trim(args[2])); err != nil {
return fmt.Errorf("Invalid END-PORT: %s", err)
}
}
if ss.endPort < ss.startPort {
return fmt.Errorf("END-PORT is greater than START-PORT")
}
return ss.synScan()
}))
return ss
}
func (s *SynScanner) Name() string {
return "syn.scan"
}
func (s *SynScanner) Description() string {
return "A module to perform SYN port scanning."
}
func (s *SynScanner) Author() string {
return "Simone Margaritelli <evilsocket@protonmail.com>"
}
func (s *SynScanner) Configure() error {
return nil
}
func (s *SynScanner) Start() error {
return nil
}
func (s *SynScanner) inRange(ip net.IP) bool {
for _, a := range s.addresses {
if a.Equal(ip) {
return true
}
}
return false
}
func (s *SynScanner) onPacket(pkt gopacket.Packet) {
var eth layers.Ethernet
var ip layers.IPv4
var tcp layers.TCP
foundLayerTypes := []gopacket.LayerType{}
parser := gopacket.NewDecodingLayerParser(
layers.LayerTypeEthernet,
ð,
&ip,
&tcp,
)
err := parser.DecodeLayers(pkt.Data(), &foundLayerTypes)
if err != nil {
return
}
if s.inRange(ip.SrcIP) && tcp.DstPort == synSourcePort && tcp.SYN && tcp.ACK {
from := ip.SrcIP.String()
port := int(tcp.SrcPort)
var host *network.Endpoint
if ip.SrcIP.Equal(s.Session.Interface.IP) {
host = s.Session.Interface
} else if ip.SrcIP.Equal(s.Session.Gateway.IP) {
host = s.Session.Gateway
} else {
host = s.Session.Lan.GetByIp(from)
}
if host != nil {
ports := host.Meta.GetIntsWith("tcp-ports", port, true)
host.Meta.SetInts("tcp-ports", ports)
}
NewSynScanEvent(from, host, port).Push()
}
}
func (s *SynScanner) synScan() error {
s.SetRunning(true, func() {
defer s.SetRunning(false, nil)
s.waitGroup.Add(1)
defer s.waitGroup.Done()
naddrs := len(s.addresses)
plural := "es"
if naddrs == 1 {
plural = ""
}
if s.startPort != s.endPort {
log.Info("SYN scanning %d address%s from port %d to port %d ...", naddrs, plural, s.startPort, s.endPort)
} else {
log.Info("SYN scanning %d address%s on port %d ...", naddrs, plural, s.startPort)
}
// set the collector
s.Session.Queue.OnPacket(s.onPacket)
defer s.Session.Queue.OnPacket(nil)
// start sending SYN packets and wait
for _, address := range s.addresses {
if s.Running() == false {
break
}
mac, err := findMAC(s.Session, address, true)
if err != nil {
log.Debug("Could not get MAC for %s: %s", address.String(), err)
continue
}
for dstPort := s.startPort; dstPort < s.endPort+1; dstPort++ {
if s.Running() == false {
break
}
err, raw := packets.NewTCPSyn(s.Session.Interface.IP, s.Session.Interface.HW, address, mac, synSourcePort, dstPort)
if err != nil {
log.Error("Error creating SYN packet: %s", err)
continue
}
if err := s.Session.Queue.Send(raw); err != nil {
log.Error("Error sending SYN packet: %s", err)
} else {
log.Debug("Sent %d bytes of SYN packet to %s for port %d", len(raw), address.String(), dstPort)
}
}
}
nports := s.endPort - s.startPort + 1
time.Sleep(time.Duration(nports*500) * time.Millisecond)
})
return nil
}
func (s *SynScanner) Stop() error {
return s.SetRunning(false, func() {
s.waitGroup.Wait()
})
}