As I’m trying to improve OnedriveMapper, I’ve been looking into methods to avoid using Browser Emulation to authenticate with Office 365.

This wasn’t difficult, but storing the cookie posed a challenge. There are no available methods in Powershell to do so, thus I went searching until I ran into a post on Stackoverflow that shows how to store a cookie using C#

Since Powershell can eat C#, this ended up being my working code to set a persistent OS cookie from Powershell:

$source=@"
using System.Runtime.InteropServices;
using System;
namespace Cookies
{
    public static class setter
    {
        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern bool InternetSetCookie(string url, string name, string data);

        public static bool SetWinINETCookieString(string url, string name, string data)
        {
            bool res = setter.InternetSetCookie(url, name, data);
            if (!res)
            {
                throw new Exception("Exception setting cookie: Win32 Error code="+Marshal.GetLastWin32Error());
            }else{
                return res;
            }
        }
    }
}
"@

$compilerParameters = New-Object System.CodeDom.Compiler.CompilerParameters
$compilerParameters.CompilerOptions="/unsafe"

Add-Type -TypeDefinition $source -Language CSharp -CompilerParameters $compilerParameters

[DateTime]$dateTime = Get-Date
$dateTime.AddDays(1)
$str = $dateTime.ToString("R")

[Cookies.setter]::SetWinINETCookieString("https://cookieURL","cookieNAME","value;Expires=$str")

edit: don’t use the Get-Hotfix PS command before you run above code, for some reason it breaks things.