How to Perform NTLM Authentication with Windows System Credentials in Go HTTP Requests?

NTLM Authentication in Go HTTP Requests with Windows System Credentials

In the world of web development, authentication is crucial for securing access to protected resources. One common authentication mechanism is NTLM, which involves using the user's Windows credentials to verify their identity. This article explores how to implement NTLM authentication in Go HTTP requests, utilizing the system credentials of the Windows user.

Traditionally, NTLM authentication requires manually specifying a username and password, but our goal is to avoid this cumbersome process. By leveraging the capabilities of the WinHTTPRequest COM object, we can tap into the system's default credentials for a seamless authentication experience.

To achieve this in Go, we employ the go-ole library, which provides an interface to interact with COM objects. Here's a code snippet that demonstrates the approach:

<code class="go">package main

import (
    "fmt"

    ole "github.com/go-ole/go-ole"
    "github.com/go-ole/go-ole/oleutil"
)

func main() {
    ole.CoInitialize(0)
    defer ole.CoUninitialize()
    unknown, _ := oleutil.CreateObject("WinHTTP.WinHTTPRequest.5.1")
    request, _ := unknown.QueryInterface(ole.IID_IDispatch)
    oleutil.CallMethod(request, "SetAutoLogonPolicy", 0)
    oleutil.CallMethod(request, "Open", "GET", "http://example.com", false)
    oleutil.CallMethod(request, "Send")
    resp := oleutil.MustGetProperty(request, "ResponseText")
    fmt.Println(resp.ToString())
}</code>

In this code, we create a WinHTTPRequest instance, set the auto logon policy to allow automatic authentication, open an HTTP GET request to a specified URL, and send the request. Finally, we retrieve the response text. The system will seamlessly fetch the user's credentials and perform the NTLM authentication, allowing access to the protected resource.

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