C#•5mo ago

How to check if program is running as root on Linux

I need my program to be run as sudo to function, so I want to exit if it's not. How can I check if the program is running as root? I can't find any method that gets you the euid.

5 Replies

NileshGR•5mo ago

Have you tried this - https://learn.microsoft.com/en-us/dotnet/api/system.environment.username?view=net-8.0

Environment.UserName Property (System)

Gets the user name of the person who is associated with the current thread.

cap5lut•5mo ago

this should also work platform independent

    public static bool IsRootUser()
    {
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        {
            using (var identity = WindowsIdentity.GetCurrent())
            {
                var principal = new WindowsPrincipal(identity);
                return principal.IsInRole(WindowsBuiltInRole.Administrator);
            }
        }
        else
        {
            return geteuid() == 0;

            [DllImport("libc")]
            static extern uint geteuid();
        }
    }

    public static bool IsRootUser()
    {
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        {
            using (var identity = WindowsIdentity.GetCurrent())
            {
                var principal = new WindowsPrincipal(identity);
                return principal.IsInRole(WindowsBuiltInRole.Administrator);
            }
        }
        else
        {
            return geteuid() == 0;

            [DllImport("libc")]
            static extern uint geteuid();
        }
    }

bakaneOP•5mo ago

Thanks!

Omnissiah•5mo ago

actually, https://github.com/dotnet/csharplang/issues/1565

GitHub

Champion "static local functions" (16.3, Core 3) · Issue #1565 · do...

The proposal is to declare a local function as non-capturing. The keyword to indicate that would be static. Note: if we do this, then we should also consider allowing parameters and locals of the l...

cap5lut•5mo ago

well, its an extern function, so it wont capture anything anyway ⤴️ will be lowered to

public static class C
{
    public static bool IsRootUser()
    {
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        {
            WindowsIdentity current = WindowsIdentity.GetCurrent();
            try
            {
                return new WindowsPrincipal(current).IsInRole(WindowsBuiltInRole.Administrator);
            }
            finally
            {
                if (current != null)
                {
                    ((IDisposable)current).Dispose();
                }
            }
        }
        return <IsRootUser>g__geteuid|0_0() == 0;
    }

    [DllImport("libc", EntryPoint = "geteuid")]
    [CompilerGenerated]
    internal static extern uint <IsRootUser>g__geteuid|0_0();
}

public static class C
{
    public static bool IsRootUser()
    {
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        {
            WindowsIdentity current = WindowsIdentity.GetCurrent();
            try
            {
                return new WindowsPrincipal(current).IsInRole(WindowsBuiltInRole.Administrator);
            }
            finally
            {
                if (current != null)
                {
                    ((IDisposable)current).Dispose();
                }
            }
        }
        return <IsRootUser>g__geteuid|0_0() == 0;
    }

    [DllImport("libc", EntryPoint = "geteuid")]
    [CompilerGenerated]
    internal static extern uint <IsRootUser>g__geteuid|0_0();
}

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How to check if program is running as root on Linux