internal/functions/Convert-Principal.ps1
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function Convert-Principal { <# .SYNOPSIS Converts a principal to either SID or NTAccount format. .DESCRIPTION Converts a principal to either SID or NTAccount format. It caches all resolutions, uses Convert-BuiltInToSID to resolve default builtin account names, uses Get-Domain to resolve foreign domain SIDs and names. Basically, it is a best effort attempt to resolve principals in a useful manner. .PARAMETER Name The name of the entity to convert. .PARAMETER OutputType Whether to return an NTAccount or SID. Defaults to SID .PARAMETER Server The server / domain to work with. .PARAMETER Credential The credentials to use for this operation. .EXAMPLE PS C:\> Convert-Principal @parameters -Name contoso\administrator Tries to convert the user contoso\administrator into a SID #> [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [string] $Name, [ValidateSet('SID','NTAccount')] [string] $OutputType = 'SID', [PSFComputer] $Server, [PSCredential] $Credential ) process { # Terminate if already cached if ($OutputType -eq 'SID' -and $script:cache_PrincipalToSID[$Name]) { return $script:cache_PrincipalToSID[$Name] } if ($OutputType -eq 'NTAccount' -and $script:cache_PrincipalToNT[$Name]) { return $script:cache_PrincipalToNT[$Name] } $builtInIdentity = Convert-BuiltInToSID -Identity $Name if ($builtInIdentity -ne $Name) { return $builtInIdentity } $parameters = $PSBoundParameters | ConvertTo-PSFHashtable -Include Server, Credential #region Processing Input SID if ($Name -as [System.Security.Principal.SecurityIdentifier]) { if ($OutputType -eq 'SID') { $script:cache_PrincipalToSID[$Name] = $Name -as [System.Security.Principal.SecurityIdentifier] return $script:cache_PrincipalToSID[$Name] } $script:cache_PrincipalToNT[$Name] = Get-Principal @parameters -Sid $Name -Domain $Name -OutputType NTAccount return $script:cache_PrincipalToNT[$Name] } #endregion Processing Input SID $ntAccount = $Name -as [System.Security.Principal.NTAccount] if ($OutputType -eq 'NTAccount') { $script:cache_PrincipalToNT[$Name] = $ntAccount return $script:cache_PrincipalToNT[$Name] } try { $script:cache_PrincipalToSID[$Name] = $ntAccount.Translate([System.Security.Principal.SecurityIdentifier]) return $script:cache_PrincipalToSID[$Name] } catch { $domainPart, $namePart = $ntAccount.Value.Split("\", 2) $domain = Get-Domain @parameters -DnsName $domainPart $param = @{ Server = $domain.DNSRoot } $cred = Get-DMDomainCredential -Domain $domain.DNSRoot if ($cred) { $param['Credential'] = $cred } $adObject = Get-ADObject @param -LDAPFilter "(samAccountName=$namePart)" -Properties ObjectSID $script:cache_PrincipalToSID[$Name] = $adObject.ObjectSID $adObject.ObjectSID } } } |