Functions/ConvertTo-SecurityIdentifier.ps1
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# Copyright 2012 Aaron Jensen # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function ConvertTo-SecurityIdentifier { <# .SYNOPSIS Converts a string or byte array security identifier into a `System.Security.Principal.SecurityIdentifier` object. .DESCRIPTION `ConvertTo-SecurityIdentifier` converts a SID in SDDL form (as a string), in binary form (as a byte array) into a `System.Security.Principal.SecurityIdentifier` object. It also accepts `System.Security.Principal.SecurityIdentifier` objects, and returns them back to you. If the string or byte array don't represent a SID, an error is written and nothing is returned. .LINK Resolve-Identity .LINK Resolve-IdentityName .EXAMPLE Resolve-Identity -SID 'S-1-5-21-2678556459-1010642102-471947008-1017' Demonstrates how to convert a a SID in SDDL into a `System.Security.Principal.SecurityIdentifier` object. .EXAMPLE Resolve-Identity -SID (New-Object 'Security.Principal.SecurityIdentifier' 'S-1-5-21-2678556459-1010642102-471947008-1017') Demonstrates that you can pass a `SecurityIdentifier` object as the value of the SID parameter. The SID you passed in will be returned to you unchanged. .EXAMPLE Resolve-Identity -SID $sidBytes Demonstrates that you can use a byte array that represents a SID as the value of the `SID` parameter. #> [CmdletBinding()] param( [Parameter(Mandatory=$true)] # The SID to convert to a `System.Security.Principal.SecurityIdentifier`. Accepts a SID in SDDL form as a `string`, a `System.Security.Principal.SecurityIdentifier` object, or a SID in binary form as an array of bytes. $SID ) Set-StrictMode -Version 'Latest' Use-CallerPreference -Cmdlet $PSCmdlet -Session $ExecutionContext.SessionState try { if( $SID -is [string] ) { New-Object 'Security.Principal.SecurityIdentifier' $SID } elseif( $SID -is [byte[]] ) { New-Object 'Security.Principal.SecurityIdentifier' $SID,0 } elseif( $SID -is [Security.Principal.SecurityIdentifier] ) { $SID } else { Write-Error ('Invalid SID. The `SID` parameter accepts a `System.Security.Principal.SecurityIdentifier` object, a SID in SDDL form as a `string`, or a SID in binary form as byte array. You passed a ''{0}''.' -f $SID.GetType()) return } } catch { Write-Error ('Exception converting SID parameter to a `SecurityIdentifier` object. This usually means you passed an invalid SID in SDDL form (as a string) or an invalid SID in binary form (as a byte array): {0}' -f $_.Exception.Message) return } } |