How to get windows usernaame in ASP.NET Core 3.0

Question

I'm trying to get windows user name in ASP.NET Core 3.0

I have found here many questions on this topic, but I cannot find any answer I could use.

My app uses login-password authentication, but lot of users (not all of them) has own windows login, so I would like to give them opportunity to log-in via Windows login.

On the localhost works this code:

string windowsUserName = Environment.UserDomainName + "\\" + Environment.UserName;

but when I deploy it to server then I get this username: IIS APPPOOL/DefaultAppPool

I have tried to change launchsettings from:

"iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,

to:

"iisSettings": {
    "windowsAuthentication": true,
    "anonymousAuthentication": true,

but I'm able to get the windows login name only via HttpContext.User.Identity.Name (I have tried this only on localhost), but this method I don't want to use - I'm storing here Id of the user from database, so I don't want to rewrite it.

Is there any chance to get required data without using windows login for everybody?

Many thanks for suggestions.

Answer 1

make sure your web.config as below:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <handlers>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified" />
    </handlers>
    <aspNetCore forwardWindowsAuthToken="true" processPath="C:\Program Files\dotnet\dotnet.exe" arguments=".\YourWebsite.dll" stdoutLogEnabled="true" stdoutLogFile=".\logs\stdout" />
        <security>
            <authentication>
                <windowsAuthentication enabled="true" />
                <anonymousAuthentication enabled="false" />
            </authentication>
        </security>
  </system.webServer>
</configuration>

HomeController.cs You can then get a user Windows username from a controller using the below code.

public IActionResult Index()
{
    string userName = HttpContext.User.Identity.Name;
    return View(userName);
}

Update:

which you mentioned in your post which is called mixed-mode authentication. you can not achieve this by using a single application you need to use two applications to implement your requirement. refer this link for more detail how can you achieve this.