{"id":208429,"date":"1970-01-01T00:00:00","date_gmt":"1970-01-01T00:00:00","guid":{"rendered":"https:\/\/www.ninjaone.com\/?post_type=script_hub&p=208429"},"modified":"2024-03-04T18:41:12","modified_gmt":"2024-03-04T18:41:12","slug":"powershell-parametrer-systeme-authentification-ntlm","status":"publish","type":"script_hub","link":"https:\/\/www.ninjaone.com\/fr\/script-hub\/powershell-parametrer-systeme-authentification-ntlm\/","title":{"rendered":"PowerShell\u00a0: comment d\u00e9finir l’authentification NTLM dans Windows"},"content":{"rendered":"

Dans un contexte de cybers\u00e9curit\u00e9 en constante \u00e9volution, il est primordial de s\u00e9curiser les communications et les \u00e9changes de donn\u00e9es. Le protocole NTLM (NT LAN Manager), utilis\u00e9 pour authentifier les utilisateurs dans les environnements Microsoft, est l’un de ceux qui ont fait l’objet de discussions. Avec les progr\u00e8s r\u00e9cents et les pr\u00e9occupations en mati\u00e8re de s\u00e9curit\u00e9, les anciennes versions de NTLM ont \u00e9t\u00e9 remplac\u00e9es par la version plus s\u00fbre NTLMv2. Aujourd’hui, nous allons \u00e9tudier un script PowerShell qui permet de g\u00e9rer les r\u00e9ponses d’authentification NTLM<\/strong> en d\u00e9finissant le niveau de compatibilit\u00e9 LmCompatibilityLevel dans le registre Windows.<\/p>\n

Contexte<\/h2>\n

D\u00e9velopp\u00e9 \u00e0 l’origine comme protocole d’authentification par Microsoft, NTLM a fait l’objet de plusieurs mises \u00e0 jour pour rem\u00e9dier \u00e0 diverses failles de s\u00e9curit\u00e9. Cependant, avec l’apparition de m\u00e9canismes d’authentification plus s\u00fbrs, notamment NTLMv2, la n\u00e9cessit\u00e9 de restreindre ou de d\u00e9sactiver les anciennes versions est devenue \u00e9vidente. Ce script aide les professionnels de l’informatique et les fournisseurs de services g\u00e9r\u00e9s (MSP)<\/a> \u00e0 effectuer cette transition en douceur, sans avoir \u00e0 naviguer manuellement dans des param\u00e8tres de registre complexes.<\/p>\n

Le script<\/h2>\n
#Requires -Version 5.1\r\n\r\n<#\r\n.SYNOPSIS\r\n    Set the LM and NTLMv1 authentication responses via LmCompatibilityLevel in the registry\r\n.DESCRIPTION\r\n    Set the LM and NTLMv1 authentication responses via LmCompatibilityLevel in the registry\r\n.EXAMPLE\r\n    No parameters needed.\r\n    Sets LAN Manager auth level to 5, \"Send NTLMv2 response only. Refuse LM & NTLM.\"\r\n.EXAMPLE\r\n     -LmCompatibilityLevel 5\r\n    Sets LAN Manager auth level to 5, \"Send NTLMv2 response only. Refuse LM & NTLM.\"\r\n.EXAMPLE\r\n     -LmCompatibilityLevel 3\r\n    Sets LAN Manager auth level to 3, \"Send NTLMv2 response only.\"\r\n    This is the default from Windows 7 and up.\r\n.EXAMPLE\r\n    PS C:> Disable-LmNtlmV1.ps1 -LmCompatibilityLevel 5\r\n    Sets LAN Manager auth level to 5, \"Send NTLMv2 response only. Refuse LM & NTLM.\"\r\n.OUTPUTS\r\n    None\r\n.NOTES\r\n    Minimum OS Architecture Supported: Windows 10, Windows Server 2016\r\n    Reference chart: https:\/\/ss64.com\/nt\/syntax-ntlm.html\r\n    Release Notes:\r\n    Initial Release\r\nBy using this script, you indicate your acceptance of the following legal terms as well as our Terms of Use at https:\/\/www.ninjaone.com\/terms-of-use.\r\n    Ownership Rights: NinjaOne owns and will continue to own all right, title, and interest in and to the script (including the copyright). NinjaOne is giving you a limited license to use the script in accordance with these legal terms. \r\n    Use Limitation: You may only use the script for your legitimate personal or internal business purposes, and you may not share the script with another party. \r\n    Republication Prohibition: Under no circumstances are you permitted to re-publish the script in any script library or website belonging to or under the control of any other software provider. \r\n    Warranty Disclaimer: The script is provided \u201cas is\u201d and \u201cas available\u201d, without warranty of any kind. NinjaOne makes no promise or guarantee that the script will be free from defects or that it will meet your specific needs or expectations. \r\n    Assumption of Risk: Your use of the script is at your own risk. You acknowledge that there are certain inherent risks in using the script, and you understand and assume each of those risks. \r\n    Waiver and Release: You will not hold NinjaOne responsible for any adverse or unintended consequences resulting from your use of the script, and you waive any legal or equitable rights or remedies you may have against NinjaOne relating to your use of the script. \r\n    EULA: If you are a NinjaOne customer, your use of the script is subject to the End User License Agreement applicable to you (EULA).\r\n.COMPONENT\r\n    ProtocolSecurity\r\n#>\r\n\r\n[CmdletBinding()]\r\nparam (\r\n    [Parameter()]\r\n    [ValidateRange(0, 5)]\r\n    [int]\r\n    $LmCompatibilityLevel = 5\r\n)\r\n\r\nbegin {\r\n    function Test-IsElevated {\r\n        $id = [System.Security.Principal.WindowsIdentity]::GetCurrent()\r\n        $p = New-Object System.Security.Principal.WindowsPrincipal($id)\r\n        if ($p.IsInRole([System.Security.Principal.WindowsBuiltInRole]::Administrator))\r\n        { Write-Output $true }\r\n        else\r\n        { Write-Output $false }\r\n    }\r\n    function Set-ItemProp {\r\n        param (\r\n            $Path,\r\n            $Name,\r\n            $Value,\r\n            [ValidateSet(\"DWord\", \"QWord\", \"String\", \"ExpandedString\", \"Binary\", \"MultiString\", \"Unknown\")]\r\n            $PropertyType = \"DWord\"\r\n        )\r\n        New-Item -Path $Path -Force -ErrorAction SilentlyContinue | Out-Null\r\n        if ((Get-ItemProperty -Path $Path -Name $Name -ErrorAction SilentlyContinue)) {\r\n            Set-ItemProperty -Path $Path -Name $Name -Value $Value -Force -Confirm:$false | Out-Null\r\n        }\r\n        else {\r\n            New-ItemProperty -Path $Path -Name $Name -Value $Value -PropertyType $PropertyType -Force -Confirm:$false | Out-Null\r\n        }\r\n    }\r\n}\r\nprocess {\r\n    if (-not (Test-IsElevated)) {\r\n        Write-Error -Message \"Access Denied. Please run with Administrator privileges.\"\r\n        exit 1\r\n    }\r\n    $Path = @(\r\n        \"HKLM:SYSTEMCurrentControlSetServicesLsa\"\r\n        \"HKLM:SYSTEMCurrentControlSetControlLSA\"\r\n    )\r\n    $Name = \"LmCompatibilityLevel\"\r\n    # $Value = $LmCompatibilityLevel\r\n    # Sets LmCompatibilityLevel to $LmCompatibilityLevel\r\n    try {\r\n        $Path | ForEach-Object {\r\n            Set-ItemProp -Path $_ -Name $Name -Value $LmCompatibilityLevel\r\n        }\r\n        \r\n    }\r\n    catch {\r\n        Write-Error $_\r\n        exit 1\r\n    }\r\n    $Path | ForEach-Object {\r\n        $Value = Get-ItemPropertyValue -Path $_ -Name $Name -ErrorAction SilentlyContinue\r\n        if ($null -eq $Value) {\r\n            Write-Host \"$_$Name set to: OS's default value(3).\"\r\n        }\r\n        else {\r\n            Write-Host \"$_$Name set to: $Value\"\r\n        }\r\n    }\r\n}\r\nend {}<\/pre>\n
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Description d\u00e9taill\u00e9e<\/h2>\n
Le script est divis\u00e9 en trois phases\u00a0: le d\u00e9but<\/em> (begin), le processus<\/em> (process) et la fin<\/em> (end).<\/p>\n