Add delay jitter

cmd/bruteforce.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+	"math/rand/v2"
 
 	"github.com/ropnop/kerbrute/util"
 	"github.com/spf13/cobra"
@@ -72,7 +73,7 @@ Scan:
 				logger.Log.Debug("[!] Skipping: %q - %v", comboline, err.Error())
 				continue
 			}
-			time.Sleep(time.Duration(delay) * time.Millisecond)
+			time.Sleep(time.Duration(delay + rand.IntN(jitter)) * time.Millisecond)
 			combosChan <- [2]string{username, password}
 		}
 	}

cmd/bruteuser.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+	"math/rand/v2"
 
 	"github.com/ropnop/kerbrute/util"
 
@@ -72,7 +73,7 @@ Scan:
 			break Scan
 		default:
 			password = scanner.Text()
-			time.Sleep(time.Duration(delay) * time.Millisecond)
+			time.Sleep(time.Duration(delay + rand.IntN(jitter)) * time.Millisecond)
 			passwordsChan <- password
 		}
 	}

cmd/kerbrute.go

@@ -30,6 +30,7 @@ func init() {
 	rootCmd.PersistentFlags().BoolVar(&safe, "safe", false, "Safe mode. Will abort if any user comes back as locked out. Default: FALSE")
 	rootCmd.PersistentFlags().IntVarP(&threads, "threads", "t", 10, "Threads to use")
 	rootCmd.PersistentFlags().IntVarP(&delay, "delay", "", 0, "Delay in millisecond between each attempt. Will always use single thread if set")
+	rootCmd.PersistentFlags().IntVarP(&jitter, "jitter", "", 1, "Delay jitter in millisecond between each attempt. Ignored if delay is not set")
 	rootCmd.PersistentFlags().BoolVar(&downgrade, "downgrade", false, "Force downgraded encryption type (arcfour-hmac-md5)")
 	rootCmd.PersistentFlags().StringVar(&hashFileName, "hash-file", "", "File to save AS-REP hashes to (if any captured), otherwise just logged")
 	if delay != 0 {

cmd/passwordspray.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+	"math/rand/v2"
 
 	"github.com/ropnop/kerbrute/util"
 
@@ -88,7 +89,7 @@ Scan:
 				logger.Log.Debugf("[!] %q - %v", usernameline, err.Error())
 				continue
 			}
-			time.Sleep(time.Duration(delay) * time.Millisecond)
+			time.Sleep(time.Duration(delay + rand.IntN(jitter)) * time.Millisecond)
 			usersChan <- username
 		}
 	}

cmd/setup.go

@@ -16,6 +16,7 @@ var (
 	verbose          bool
 	safe             bool
 	delay            int
+	jitter           int
 	threads          int
 	stopOnSuccess    bool
 	userAsPass       = false
@@ -54,6 +55,6 @@ func setupSession(cmd *cobra.Command, args []string) {
 		logger.Log.Infof("\t%s\n", v)
 	}
 	if delay != 0 {
-		logger.Log.Infof("Delay set. Using single thread and delaying %dms between attempts\n", delay)
+		logger.Log.Infof("Delay set. Using single thread and delaying %dms (%dms jitter) between attempts\n", delay, jitter)
 	}
 }

cmd/userenum.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+	"math/rand/v2"
 
 	"github.com/ropnop/kerbrute/util"
 	"github.com/spf13/cobra"
@@ -66,7 +67,7 @@ Scan:
 				logger.Log.Debugf("[!] %q - %v", usernameline, err.Error())
 				continue
 			}
-			time.Sleep(time.Duration(delay) * time.Millisecond)
+			time.Sleep(time.Duration(delay + rand.IntN(jitter)) * time.Millisecond)
 			usersChan <- username
 		}
 	}