usr/lib/Get-LogonSessions.ps1
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using namespace System.Security.Principal Set-Alias -Name lsess -Value Get-LogonSessions function Get-LogonSessions { [CmdletBinding()]param() begin { New-Structure LUID { UInt32 LowPart Int32 HighPart } -CharSet Unicode New-Structure LSA_UNICODE_STRING { UInt16 Length UInt16 MaximumLength String 'Buffer LPWStr' } -CharSet Unicode New-Enum SECURITY_LOGON_TYPE { UndefinedLogonType = 0 Interactive = 2 Network Batch Service Proxy Unlock NetworkCleartext NewCredentials RemoteInteractive CachedInteractive CachedRemoteInteractive CachedUnlock } -Type ([UInt32]) <# New-Structure LSA_LAST_INTER_LOGON_INFO { Int64 LastSuccessfulLogon Int64 LastFailedLogon UInt32 FailedAttemptCountSinceLastSuccessfulLogon } -CharSet Unicode #> New-Structure SECURITY_LOGON_SESSION_DATA { UInt32 Size LUID LogonId LSA_UNICODE_STRING UserName LSA_UNICODE_STRING LogonDomain LSA_UNICODE_STRING AuthenticationPackage SECURITY_LOGON_TYPE LogonType UInt32 Session IntPtr Sid Int64 LogonTime <# LSA_UNICODE_STRING LogonServer LSA_UNICODE_STRING DnsDomainName LSA_UNICODE_STRING Upn UInt32 UserFlags LSA_LAST_INTER_LOGON_INFO LastLogonInfo LSA_UNICODE_STRING LogonScript LSA_UNICODE_STRING ProfilePath LSA_UNICODE_STRING HomeDirectory LSA_UNICODE_STRING HomeDirectoryDrive Int64 LogoffTime Int64 KickOffTime Int64 PasswordLastSet Int64 PasswordCanChange Int64 PasswordMustChange #> } -CharSet Unicode New-Delegate secur32 { int LsaEnumerateLogonSessions([uint_, ptr_]) int LsaFreeReturnBuffer([ptr]) int LsaGetLogonSessionData([ptr, ptr_]) } $to_i = "ToInt$([IntPtr]::Size * 8)" } process {} end { $count, $slist = 0, [IntPtr]::Zero try { if (($nts = $secur32.LsaEnumerateLogonSessions.Invoke([ref]$count, [ref]$slist)) -ne 0) { throw (ConvertTo-ErrMessage -NtStatus $nts) } $luid, $data = $slist.$to_i(), [IntPtr]::Zero for ($i = 0; $i -lt $count; $i++) { if (($nts = $secur32.LsaGetLogonSessionData.Invoke([IntPtr]$luid, [ref]$data)) -ne 0) { throw (ConvertTo-ErrMessage -NtStatus $nts) } $sess = $data -as [SECURITY_LOGON_SESSION_DATA] [PSCustomObject]@{ LogonType = $sess.LogonType UserName = '{0}\{1}' -f $sess.LogonDomain.Buffer, $sess.UserName.Buffer AuthPackage = $sess.AuthenticationPackage.Buffer Session = $sess.Session Sid = $sess.Sid -ne [IntPtr]::Zero ? [SecurityIdentifier]::new($sess.Sid).ToString() : [String]::Empty LogonTime = [DateTime]::FromFileTime($sess.LogonTime) } $luid += [LUID]::GetSize() if (($nts = $secur32.LsaFreeReturnBuffer.Invoke($data)) -ne 0) { Write-Verbose (ConvertTo-ErrMessage -NtStatus $nts) } } } catch {Write-Verbose $_} finally { if ($slist -ne [IntPtr]::Zero) { if (($nts = $secur32.LsaFreeReturnBuffer.Invoke($slist)) -ne 0) { Write-Verbose (ConvertTo-ErrMessage -NtStatus $nts) } } } } } Export-ModuleMember -Alias lsess -Function Get-LogonSessions |