# Purpose

We're going to be looking at how to create a server setup file that doesn't trigger any prompts that aren't user friendly. This setup file will contain another signed file that will launch a basic web server. The setup file will create the server file and a firewall rule for the server file. We will be building two files (`setup.go` and `server.go`) separately .

# The Server File

We're creating our web server file, building it and signing the application.

## Creating the Server File

Create a file named `server.go` and add the following:

```
//go:generate goversioninfo

package main

import (
	"flag"
	"log"
	"net/http"
)

func main() {

	port := flag.String("p", "8100", "port to serve on")
	directory := flag.String("d", ".", "the directory of static file to host")
	flag.Parse()

	http.Handle("/", http.FileServer(http.Dir(*directory)))

	log.Printf("Serving %s on HTTP port: %s\n", *directory, *port)
	log.Fatal(http.ListenAndServe(":"+*port, nil))
}
```

*Windows 10 will happily create server.go.txt if you don't turn off hidden file extensions and leave you wondering what's wrong with your Go install.*

First of all, you'll want to install Golang: https://golang.org/dl/
Then you'll want to install [goversioninfo](https://github.com/josephspurrier/goversioninfo) by running the following in a command prompt:

```
go get github.com/josephspurrier/goversioninfo/cmd/goversioninfo
```

This will allow us to set the name of the program, version, publisher name, etc.

```
# Add this to the top of your server go file.
//go:generate goversioninfo
# Then generate the configuration by running the following in a command prompt:
go generate
```

This will create a configuration file named `versioninfo.json` in the current directory. There are three things you will want to edit: 1. The version of the application, 2. The "publisher" or company name and 3. The product name.

![](versioninfo.png)

Near the top of the file, you will see `FileVersion` and `ProductVersion`.
You can set normal major, minor, patch and build versions for those values. The `FileVersion` is the version of the file and `ProductVersion` is the version of the application as a whole. You can most likely use the same version for both unless you're doing something unusual. You will set the same values again under `StringFileInfo`.

Next, you can set the "publisher name" by filling in the `CompanyName` value with the name of your organization.

Lastly, you can give your application a name, like "Go Web Server" under the `ProductName` value.

```
# Next, build your server app.
go build -o server.exe -ldflags "-s -w -H=windowsgui"
```

You will want to sign your application, the next section will show you how.

## Signing the Setup File

### Getting a Code Signing Certificate

Be aware that you will likely need to create a Dun & Bradstreet listing to get an "organization" code-signing certificate: https://www.dandb.com/businessdirectory/products/ (this is free)

You can purchase a code-signing certificate here: https://cheapsslsecurity.com/comodo/codesigningcertificate.html The validation process will take 1-3 business days if your information is correct and you give them your D-U-N-S (Dun & Bradstreet) number. After you receive an email containing a link to the certificate, follow these directions in the **exact same** browser as the one you used to request the certificate : https://cheapsslsecurity.com/downloads.aspx?ispdf=true&iscs=true&filenm=Comodo_Code_Signing_Collection_Guide.pdf

### Signing the File

[Screenshot] Next, you will need to install Visual Studio. You can download Visual Studio here: https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=Community&rel=16

In the install process, you will be greeted with this screen:

![](windowsdev.png)


Choose the "Universal Windows Platform Development" workload. After you have finished installing Visual Studio, open a "Developer Command Prompt for VS".

![](developerprompt.png)

 ```
 # Sign a file with your certificate.
 SignTool sign /t http://timestamp.comodoca.com /f codesigning.p12 /p <Password> file.exe
```

![](signfile.png)

You should see something like this:

![](donesigning.png)

# The Setup File

Now we're going to create the setup file that will create the firewall rule we need and "create" the server file for us.

## Firewall Rule

Create a file named `setup.go` and include the following:

```
//go:generate goversioninfo -manifest=setup.exe.manifest
//Add new firewall rule in Go.

package main

import (
	"os"
	"os/exec"
	"io/ioutil"
	"syscall"
	"fmt"
	"log"
	"static" // Your fileb0x.
)

func main() {

  // Grab files from virtual filesystem
	files, err := static.WalkDirs("", false)
	if err != nil {
		log.Fatal(err)
		log.Println("ALL FILES", files)
	}

  // here we'll read the file from the virtual file system
	b, err := static.ReadFile("server.exe")
	if err != nil {
		log.Fatal(err)
	}

  // Copy file from virtual filesystem to real filesystem
	err = ioutil.WriteFile("server.exe", b, 0644)
        if err != nil {
                fmt.Println("Error creating", "server.exe")
                fmt.Println(err)
                return
        }

  // Get current working directory and set it to 'dir'.
	dir, err := os.Getwd()
	if err != nil {
		log.Fatal(err)
  }

  // Set server file path to 'file'
	var file = "-Program '" + dir + "\\server.exe'"
	//Create firewall rule
	cmdinstance := exec.Command("powershell.exe", "-WindowStyle", "Hidden", "-Command", "New-NetFirewallRule", "-DisplayName", "'Go Web Server'", "-Direction", "Inbound", file, "-Action", "Allow")
  cmdinstance.SysProcAttr = &syscall.SysProcAttr{HideWindow: true} // Make it silent.
	cmdoutput, cmderr := cmdinstance.Output()
  if cmderr != nil {
		fmt.Println(cmderr)
		fmt.Println(cmdoutput)
	}
}
```

Then create another file called `setup.exe.manifest` containing:

```
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
    <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
        <security>
            <requestedPrivileges>
                <requestedExecutionLevel level="requireAdministrator" uiAccess="false"/>
            </requestedPrivileges>
        </security>
    </trustInfo>
</assembly>
```

Rename `server.go` to `server.go_`

## Put the Server File In the Setup File

We need to install `fileb0x` to be able to store our server file (`server.exe`) in our setup file (`setup.exe`).

```
# Install fileb0x
go get -u github.com/UnnoTed/fileb0x
```

Download a pre-made configuration file by running this in the command prompt:
```
// LAL AL LALALALALALLLAL POP
powershell "Invoke-WebRequest -OutFile b0x.json rootprojects/b0x.json"
```

```
# Create a fileb0x
fileb0x b0x.json
```

This will create a folder named `static` with a file in it. You will then need to copy that folder to your `$GOPATH/src/` (usually C:\Users\Username\Go\src\).

```
# Build the setup application.
go build -o setup.exe -ldflags "-s -w -H=windowsgui"
```

## WIP

Service: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/new-service?view=powershell-6
Credential seems to be what makes it admin or not: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/set-service?view=powershell-6