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hmac.go
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hmac.go
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package detector
import (
"fmt"
"os"
"path"
"strings"
"sync"
"time"
"github.com/deckarep/golang-set"
"github.com/rjeczalik/notify"
log "github.com/sirupsen/logrus"
"github.com/maximbaz/yubikey-touch-detector/notifier"
)
// WatchHMAC watches when YubiKey is waiting for a touch on a HMAC request
func WatchHMAC(notifiers *sync.Map) {
devicesEvents := initInotifyWatcher("HMAC", "/dev", notify.Create, notify.Remove)
defer notify.Stop(devicesEvents)
yubikeyHidrawDevices := mapset.NewSet()
if devices, err := os.ReadDir("/dev"); err == nil {
for _, device := range devices {
devicePath := path.Join("/dev", device.Name())
if isYubikeyHidrawDevice(devicePath) {
yubikeyHidrawDevices.Add(devicePath)
}
}
} else {
log.Errorf("Cannot list devices in '/dev' to find connected YubiKeys: %v", err)
}
lastMessage := notifier.HMAC_OFF
var onRemoveTimer *time.Timer
for event := range devicesEvents {
switch event.Event() {
case notify.Create:
if onRemoveTimer != nil {
onRemoveTimer.Stop()
}
// Give a second for device to initialize
time.Sleep(1 * time.Second)
if isYubikeyHidrawDevice(event.Path()) {
yubikeyHidrawDevices.Add(event.Path())
newMessage := notifier.HMAC_OFF
if lastMessage != newMessage {
notifiers.Range(func(_, v interface{}) bool {
v.(chan notifier.Message) <- newMessage
return true
})
}
lastMessage = newMessage
}
case notify.Remove:
if yubikeyHidrawDevices.Contains(event.Path()) {
if onRemoveTimer != nil {
onRemoveTimer.Stop()
}
yubikeyHidrawDevices.Remove(event.Path())
onRemoveTimer = time.AfterFunc(1*time.Second, func() {
newMessage := notifier.HMAC_OFF
if yubikeyHidrawDevices.Cardinality() > 0 {
newMessage = notifier.HMAC_ON
}
if lastMessage != newMessage {
notifiers.Range(func(_, v interface{}) bool {
v.(chan notifier.Message) <- newMessage
return true
})
}
lastMessage = newMessage
})
}
}
}
}
func isYubikeyHidrawDevice(devicePath string) bool {
if strings.HasPrefix(devicePath, "/dev/hidraw") {
if info, err := os.ReadFile(fmt.Sprintf("/sys/class/hidraw/%v/device/uevent", path.Base(devicePath))); err == nil {
if strings.Contains(strings.ToLower(string(info)), "yubikey") {
return true
}
}
}
return false
}