forked from bettercap/bettercap
/
syn_scan.go
258 lines (218 loc) · 6.28 KB
/
syn_scan.go
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package modules
import (
"fmt"
"net"
"strconv"
"sync"
"sync/atomic"
"time"
"github.com/bettercap/bettercap/log"
"github.com/bettercap/bettercap/packets"
"github.com/bettercap/bettercap/session"
"github.com/malfunkt/iprange"
"github.com/evilsocket/islazy/str"
"github.com/evilsocket/islazy/tui"
)
const synSourcePort = 666
type synScannerStats struct {
started time.Time
numPorts uint64
numAddresses uint64
totProbes uint64
doneProbes uint64
openPorts uint64
}
type SynScanner struct {
session.SessionModule
addresses []net.IP
startPort int
endPort int
progressEvery time.Duration
stats synScannerStats
waitGroup *sync.WaitGroup
}
func NewSynScanner(s *session.Session) *SynScanner {
ss := &SynScanner{
SessionModule: session.NewSessionModule("syn.scan", s),
addresses: make([]net.IP, 0),
waitGroup: &sync.WaitGroup{},
progressEvery: time.Duration(1) * time.Second,
}
ss.AddParam(session.NewIntParameter("syn.scan.show-progress-every",
"1",
"Period in seconds for the scanning progress reporting."))
ss.AddHandler(session.NewModuleHandler("syn.scan stop", "syn\\.scan (stop|off)",
"Stop the current syn scanning session.",
func(args []string) error {
if !ss.Running() {
return fmt.Errorf("no syn.scan is running")
}
return ss.Stop()
}))
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 {
period := 0
if ss.Running() {
return fmt.Errorf("A scan is already running, wait for it to end before starting a new one.")
} else if err := ss.parseTargets(args[0]); err != nil {
return err
} else if err = ss.parsePorts(args); err != nil {
return err
} else if err, period = ss.IntParam("syn.scan.show-progress-every"); err != nil {
return err
} else {
ss.progressEvery = time.Duration(period) * time.Second
}
return ss.synScan()
}))
ss.AddHandler(session.NewModuleHandler("syn.scan.progress", "syn\\.scan\\.progress",
"Print progress of the current syn scanning session.",
func(args []string) error {
if !ss.Running() {
return fmt.Errorf("no syn.scan is running")
}
return ss.showProgress()
}))
return ss
}
func (s *SynScanner) parseTargets(arg string) error {
if list, err := iprange.Parse(arg); err != nil {
return fmt.Errorf("error while parsing IP range '%s': %s", arg, err)
} else {
s.addresses = list.Expand()
}
return nil
}
func (s *SynScanner) parsePorts(args []string) (err error) {
argc := len(args)
s.stats.totProbes = 0
s.stats.doneProbes = 0
s.startPort = 1
s.endPort = 65535
if argc > 1 && str.Trim(args[1]) != "" {
if s.startPort, err = strconv.Atoi(str.Trim(args[1])); err != nil {
return fmt.Errorf("invalid start port %s: %s", args[1], err)
} else if s.startPort > 65535 {
s.startPort = 65535
}
s.endPort = s.startPort
}
if argc > 2 && str.Trim(args[2]) != "" {
if s.endPort, err = strconv.Atoi(str.Trim(args[2])); err != nil {
return fmt.Errorf("invalid end port %s: %s", args[2], err)
}
}
if s.endPort < s.startPort {
return fmt.Errorf("end port %d is greater than start port %d", s.endPort, s.startPort)
}
return
}
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 plural(n uint64) string {
if n > 1 {
return "s"
}
return ""
}
func (s *SynScanner) showProgress() error {
progress := 100.0 * (float64(s.stats.doneProbes) / float64(s.stats.totProbes))
log.Info("[%s] [%.2f%%] found %d open port%s for %d address%s, sent %d/%d packets in %s",
tui.Green("syn.scan"),
progress,
s.stats.openPorts,
plural(s.stats.openPorts),
s.stats.numAddresses,
plural(s.stats.numAddresses),
s.stats.doneProbes,
s.stats.totProbes,
time.Since(s.stats.started))
return nil
}
func (s *SynScanner) Stop() error {
log.Info("[%s] stopping ...", tui.Green("syn.scan"))
return s.SetRunning(false, func() {
s.waitGroup.Wait()
s.showProgress()
})
}
func (s *SynScanner) synScan() error {
s.SetRunning(true, func() {
defer s.SetRunning(false, nil)
s.waitGroup.Add(1)
defer s.waitGroup.Done()
s.stats.openPorts = 0
s.stats.numPorts = uint64(s.endPort - s.startPort + 1)
s.stats.started = time.Now()
s.stats.numAddresses = uint64(len(s.addresses))
s.stats.totProbes = s.stats.numAddresses * s.stats.numPorts
s.stats.doneProbes = 0
plural := "es"
if s.stats.numAddresses == 1 {
plural = ""
}
if s.stats.numPorts > 1 {
log.Info("scanning %d address%s from port %d to port %d ...", s.stats.numAddresses, plural, s.startPort, s.endPort)
} else {
log.Info("scanning %d address%s on port %d ...", s.stats.numAddresses, plural, s.startPort)
}
// set the collector
s.Session.Queue.OnPacket(s.onPacket)
defer s.Session.Queue.OnPacket(nil)
// start to show progress every second
go func() {
for {
time.Sleep(s.progressEvery)
if s.Running() {
s.showProgress()
} else {
break
}
}
}()
// start sending SYN packets and wait
for _, address := range s.addresses {
if !s.Running() {
break
}
mac, err := s.Session.FindMAC(address, true)
if err != nil {
atomic.AddUint64(&s.stats.doneProbes, s.stats.numPorts)
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() {
break
}
atomic.AddUint64(&s.stats.doneProbes, 1)
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)
}
time.Sleep(time.Duration(10) * time.Millisecond)
}
}
})
return nil
}