Revert recent change and run sshd back in service account (#134)

https://github.com/PowerShell/Win32-OpenSSH/issues/681

contrib/win32/openssh/install-sshd.ps1

@@ -11,6 +11,70 @@ $logsdir = Join-Path $scriptdir "logs"
 
 $sshdAccount = "NT SERVICE\SSHD"
 
+#Idea borrowed from http://sqldbamusings.blogspot.com/2012/03/powershell-adding-accounts-to-local.html
+function Add-Privilege
+{
+    param(
+    [string] $Account,
+    
+    [ValidateSet("SeAssignPrimaryTokenPrivilege", "SeServiceLogonRight")]
+    [string] $Privilege
+    )
+
+    #Get $Account SID
+    $account_sid = $null
+    try 
+    {
+	    $ntprincipal = new-object System.Security.Principal.NTAccount "$Account"
+	    $sid = $ntprincipal.Translate([System.Security.Principal.SecurityIdentifier])
+	    $account_sid = $sid.Value.ToString()
+    } 
+    catch 
+    {
+	    Throw 'Unable to resolve '+ $Account
+    }
+
+    #Prepare policy settings file to be applied
+    $settings_to_export = [System.IO.Path]::GetTempFileName()
+    "[Unicode]" | Set-Content $settings_to_export -Encoding Unicode
+    "Unicode=yes" | Add-Content $settings_to_export -Force -WhatIf:$false
+    "[Version]"  | Add-Content $settings_to_export -Force -WhatIf:$false
+    "signature=`"`$CHICAGO`$`"" | Add-Content $settings_to_export -Force -WhatIf:$false
+    "Revision=1" | Add-Content $settings_to_export -Force -WhatIf:$false
+    "[Privilege Rights]" | Add-Content $settings_to_export -Force -WhatIf:$false
+
+    #Get Current policy settings
+    $imported_settings = [System.IO.Path]::GetTempFileName()
+    secedit.exe /export /areas USER_RIGHTS /cfg "$($imported_settings)" > $null 
+
+    if (-not(Test-Path $imported_settings)) {
+        Throw "Unable to import current security policy settings"
+    }
+
+    #find current assigned accounts to $Privilege and add it to $settings_to_export
+    $current_settings = Get-Content $imported_settings -Encoding Unicode
+    $existing_setting = $null
+    foreach ($setting in $current_settings) {
+        if ($setting -like "$Privilege`*") {
+            $existing_setting = $setting
+        }            
+    }
+
+    #Add $account_sid to list
+    if ($existing_setting -eq $null) {
+        $Privilege + " = *" + $account_sid | Add-Content $settings_to_export -Force -WhatIf:$false
+    }
+    else
+    {
+        $existing_setting + ",*" + $account_sid | Add-Content $settings_to_export -Force -WhatIf:$false
+    }
+
+    #export
+    secedit.exe /configure /db "secedit.sdb" /cfg "$($settings_to_export)" /areas USER_RIGHTS > $null 
+
+}
+
+
 if (-not (Test-Path $sshdpath)) {
     throw "sshd.exe is not present in script path"
 }
@@ -31,8 +95,10 @@ New-Service -Name ssh-agent -BinaryPathName $sshagentpath -Description "SSH Agen
 cmd.exe /c 'sc.exe sdset ssh-agent D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)(A;;RP;;;AU)'
 
 New-Service -Name sshd -BinaryPathName $sshdpath -Description "SSH Daemon" -StartupType Manual -DependsOn ssh-agent | Out-Null
-sc.exe config sshd obj= "NT AUTHORITY\NetworkService"
-sc.exe sidtype sshd unrestricted
+sc.exe config sshd obj= $sshdAccount
+
+Add-Privilege -Account $sshdAccount -Privilege SeAssignPrimaryTokenPrivilege
+Add-Privilege -Account $sshdAccount -Privilege SeServiceLogonRight
 
 if(-not (test-path $logsdir -PathType Container))
 {