internal/functions/Resolve-ADPrincipal.ps1
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function Resolve-ADPrincipal { <# .SYNOPSIS Resolves an AD Principal into a common format. .DESCRIPTION Resolves an AD Principal into a common format. Optimized for use with cross-domain migration procedures. Caches successful results. Returns empty values on unresolved users. .PARAMETER Name Name of the principal to resolve. .PARAMETER Domain Domain to resolve it for. Read access is required. .EXAMPLE PS C:\> Resolve-ADPrincipal -Name 'contoso\max' -Domain 'contoso.com' Resolves the user max from contoso.com #> [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingEmptyCatchBlock', '')] [CmdletBinding()] param ( [Parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true)] [string[]] $Name, [Parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true)] [string] $Domain ) begin { if (-not $script:principals) { $script:principals = @{ } } $principalsToIgnore = @( # .NET Account sids, that are shared across all domains and need no translation 'S-1-5-82-3876422241-1344743610-1729199087-774402673-2621913236' 'S-1-5-82-271721585-897601226-2024613209-625570482-296978595' # Everyone, as it is 100% generic and has no domain-prefix 'S-1-1-0' # NT Authority SIDs, as SID-to-SID need no translation, localization can be an issue 'S-1-5-18' 'S-1-5-19' 'S-1-5-20' ) $defaultDomainData = Get-DomainData -Domain $Domain $defaultDomainFQDN = $defaultDomainData.Fqdn $defaultDomainName = $defaultDomainData.Name } process { foreach ($identity in $Name) { if ($identity -in $principalsToIgnore) { continue } Write-Verbose "[Resolve-ADPrincipal] Resolving $identity" #region Resolve Principal Domain $domainFQDN = $defaultDomainFQDN $domainName = $defaultDomainName if ($identity -like "*@*") { $domainObject = Get-DomainData -Domain $identity.Split("@")[1] if ($domainObject) { $domainFQDN = $domainObject.Fqdn $domainName = $domainObject.Name } } elseif ($identity -as [System.Security.Principal.SecurityIdentifier]) { if (([System.Security.Principal.SecurityIdentifier]$identity).AccountDomainSid) { $domainObject = Get-DomainData -Domain ([System.Security.Principal.SecurityIdentifier]$identity).AccountDomainSid if ($domainObject) { $domainFQDN = $domainObject.Fqdn $domainName = $domainObject.Name } } } elseif ($identity -like "*\*") { try { $domainObject = Get-DomainData -Domain $identity.Split("\")[0] -ErrorAction Stop } catch { } if ($domainObject) { $domainFQDN = $domainObject.Fqdn $domainName = $domainObject.Name } } $rootDomain = (Get-ADForest -Server $domainFQDN).RootDomain #endregion Resolve Principal Domain if (-not $script:principals[$domainFQDN]) { $script:principals[$domainFQDN] = @{ } } # Return form Cache if available if ($script:principals[$domainFQDN][$identity]) { return $script:principals[$domainFQDN][$identity] } #region Resolve User in AD if ($identity -as [System.Security.Principal.SecurityIdentifier]) { $adObject = Get-ADObject -Server $domainFQDN -LDAPFilter "(objectSID=$identity)" -Properties ObjectSID, SamAccountName # Handle Builtin SIDs that only exist in the root domain if (-not $adObject) { $adObject = Get-ADObject -Server $rootDomain -LDAPFilter "(objectSID=$identity)" -Properties ObjectSID, SamAccountName } } elseif (Test-IsDistinguishedName -Name $identity) { $adObject = Get-ADObject -Server ($identity | ConvertTo-DnsDomainName) -Identity $identity -Properties ObjectSID, SamAccountName } elseif ($identity -like "*\*") { try { $sidName = ([System.Security.Principal.NTAccount]$identity).Translate([System.Security.Principal.SecurityIdentifier]) } catch { Write-Warning "Failed to translate identity: $identity" continue } try { $adObject = Get-ADObject -Server $domainFQDN -LDAPFilter "(objectSID=$sidName)" -Properties ObjectSID, SamAccountName -ErrorAction Stop } catch { } if (-not $adObject) { $script:principals[$domainFQDN][$identity] = [pscustomobject]@{ DistinguishedName = $null Name = $identity SID = $sidName.Value RID = $sidName.Value.ToString().Split("-")[-1] Type = 'Local BuiltIn' IsBuiltin = $true DomainName = $domainName DomainFqdn = $domainFQDN } $script:principals[$domainFQDN][$identity] continue } } else { try { $sidName = ([System.Security.Principal.NTAccount]$identity).Translate([System.Security.Principal.SecurityIdentifier]) if ($sidName.Value -like 'S-1-3-*') { $script:principals[$domainFQDN][$identity] = [pscustomobject]@{ DistinguishedName = $null Name = $identity SID = $sidName.Value RID = $sidName.Value.ToString().Split("-")[-1] Type = 'Local BuiltIn' IsBuiltin = $true DomainName = $domainName DomainFqdn = $domainFQDN } $script:principals[$domainFQDN][$identity] continue } $adObject = Get-ADObject -Server $domainFQDN -LDAPFilter "(objectSID=$sidName)" -Properties ObjectSID, SamAccountName } catch { $adObject = Get-ADObject -Server $domainFQDN -LDAPFilter "(SamAccountName=$identity)" -Properties ObjectSID, SamAccountName } } if (-not $adObject -or -not $adObject.ObjectSID) { Write-Warning "Failed to resolve principal: $identity" continue } #endregion Resolve User in AD $script:principals[$domainFQDN][$identity] = [pscustomobject]@{ DistinguishedName = $adObject.DistinguishedName Name = $adObject.SamAccountName SID = $adObject.ObjectSID.Value RID = $adObject.ObjectSID.Value.ToString().Split("-")[-1] Type = $adObject.ObjectClass IsBuiltin = ((($adObject.ObjectSID.Value.Split("-")[-1] -as [int]) -lt 1000) -or ($adObject.ObjectSID.Value -like 'S-1-5-32-*')) DomainName = $domainName DomainFqdn = $domainFQDN } $script:principals[$domainFQDN][$identity] } } } |