Private/Test-IsValidSID.ps1
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function Test-IsValidSID { <# .SYNOPSIS Cmdlet will check if the input string is a valid SID. .DESCRIPTION Cmdlet will check if the input string is a valid SID. Cmdlet is intended as a diagnostic tool for input validation .PARAMETER ObjectSID A string representing the object Security Identifier (SID). .EXAMPLE Test-IsValidDN -ObjectSID 'S-1-5-21-2562450185-1914323539-512974444-1234' .NOTES https://pscustomobject.github.io/powershell/howto/identity%20management/PowerShell-Check-If-String-Is-A-DN/ Version: 1.0 DateModified: 08/Oct/2021 LasModifiedBy: Vicente Rodriguez Eguibar vicente@eguibar.com Eguibar Information Technology S.L. http://www.eguibarit.com #> [CmdletBinding(ConfirmImpact = 'Low', SupportsShouldProcess = $false)] [OutputType([bool])] param ( [Parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true, ValueFromRemainingArguments = $true, HelpMessage = 'String to be validated as SID', Position = 0)] [ValidateNotNullOrEmpty()] [Alias('SID', 'SecurityIdentifier')] [string] $ObjectSID ) Begin { # Ensure only account is used (remove anything before \ if exist) $ObjectSID = ($PSBoundParameters['ObjectSID']).Split('\')[1] [bool]$isValid = $false } #end Begin Process { # try RegEx Try { if ($Variables.WellKnownSIDs -Contains $ObjectSID) { # Provide verbose output if ($PSCmdlet.MyInvocation.BoundParameters['Verbose']) { Write-Verbose -Message ('The SID {0} is a WellKnownSid.' -f $ObjectSID) } #end If $isValid = $true #return } elseIf ($ObjectSID -match $Constants.SidRegEx) { # Provide verbose output if ($PSCmdlet.MyInvocation.BoundParameters['Verbose']) { Write-Verbose -Message ('The SID {0} is valid.' -f $ObjectSID) } #end If $isValid = $true #return } else { # Provide verbose output if ($PSCmdlet.MyInvocation.BoundParameters['Verbose']) { Write-Verbose -Message ('[WARNING] The SID {0} is NOT valid!.' -f $ObjectSID) } #end If $isValid = $false } #end If-Else } catch { # Handle exceptions gracefully Write-Error -Message ('An error occurred when validating the SID: {0}' -f $_) } #end Try-Catch <# # try Native SID Try { # Perform the actual validation [System.Security.Principal.SecurityIdentifier]$sid = $Sid $isValid = $True # Provide verbose output if ($PSCmdlet.MyInvocation.BoundParameters['Verbose']) { Write-Verbose "objectSID validation result by [SecurityIdentifier]: $isValid" } #end If } catch { # Handle exceptions gracefully Write-Error "An error occurred on [SecurityIdentifier] comparison: $_" } #end Try-Catch #> } #end Process end { return $isValid } #end End } #end Function |