AzStackHci.EnvironmentChecker

10.2609.0.2002

Test-XmlSignature.ps1

                                <###################################################

 #                                                 #

 #  Copyright (c) Microsoft. All rights reserved.  #

 #                                                 #

 ##################################################>

<#

.SYNOPSIS

    Validates that an XML file is digitally signed by Microsoft.

.DESCRIPTION

    This script verifies the digital signature of an XML file to ensure it was signed

    by a trusted Microsoft certificate. It validates the certificate chain and ensures

    the signature is valid.

.PARAMETER XmlPath

    Path to the XML file to validate.

.EXAMPLE

    .\Test-XmlSignature.ps1 -XmlPath "C:\Temp\manifest.xml"

    Validates the signature of the specified XML file.

.OUTPUTS

    System.Boolean

    Returns $true if the XML is signed by Microsoft, $false otherwise.

#>

[CmdletBinding()]

param (

    [Parameter(Mandatory = $true)]

    [ValidateScript({Test-Path $_ -PathType Leaf})]

    [System.String]

    $XmlPath

)

function Test-XMLSignatureByMicrosoft

{

    [CmdletBinding()]

    param (

        [Parameter(Mandatory = $true)]

        [System.String]

        $XmlPath

    )

    # Read the xml file so we can test the signature.

    try

    {

        $XmlDocument = New-Object -TypeName System.Xml.XmlDocument

        $XmlDocument.PreserveWhitespace = $true

        # Use FileStream with FileShare.ReadWrite to prevent file locking issues

        $fileStream = New-Object System.IO.FileStream($XmlPath, [System.IO.FileMode]::Open, [System.IO.FileAccess]::Read, [System.IO.FileShare]::ReadWrite)

        try {

            $xmlTextReader = New-Object -TypeName System.Xml.XmlTextReader -ArgumentList $fileStream

            try {

                $XmlDocument.Load($xmlTextReader)

            }

            finally {

                $xmlTextReader.Dispose()

            }

        }

        finally {

            $fileStream.Dispose()

        }

    }

    catch

    {

        Write-Warning "Failed to load XML document: $XmlPath - $_"

        return $false

    }

    $validSignature = $false

    $isSignedByMicrosoft = $false

    Write-Verbose "Testing $XmlPath"

    $signatures = $XmlDocument.GetElementsByTagName('Signature')

    if (-not [System.String]::IsNullOrEmpty($signatures))

    {

        foreach($signature in $signatures)

        {

            # Get the signed XML to validate the signature.

            Add-Type -AssemblyName System.Security

            $signedXml = New-Object System.Security.Cryptography.Xml.SignedXml -ArgumentList $XmlDocument

            $signedXml.LoadXml([System.Xml.XmlElement]$signature)

            $x509certificates = $signature.KeyInfo.x509Data

            if (-not [System.String]::IsNullOrEmpty($x509certificates))

            {

                # Find the signing certificate, and add intermediate certificate to enable disconnected validation

                foreach($x509certificate in $x509certificates.X509Certificate)

                {

                    $certBytes = [System.Convert]::FromBase64String($x509certificate)

                    $certificate = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2 -ArgumentList $certBytes,$null

                    Write-Verbose $certificate.Thumbprint

                    if ($signedXml.CheckSignature($certificate,$true))

                    {

                        # This is the signing certificate

                        Write-Verbose "This is the signing certificate $($certificate.Thumbprint)"

                        Write-Verbose "$XmlPath,$($certificate.Thumbprint)"

                        $signingCertificate = $certificate

                    }

                    elseif (Get-ChildItem -Path Cert:\LocalMachine\Root | Where-Object {$_.Thumbprint -eq $certificate.Thumbprint})

                    {

                        # This is an existing trusted root

                        Write-Verbose "This is an existing trusted root $($certificate.Thumbprint)"

                    }

                    else

                    {

                        # This is not the signing certificate or an existing trusted root, add it to Intermediate CAs...

                        # ...this allows IsMicrosoftCertificate and x509Chain.Build to function, even when disconnected.

                        Write-Verbose "$($certificate.Thumbprint)"

                        if (Get-ChildItem -Path Cert:\LocalMachine\CA | Where-Object {$_.Thumbprint -eq $certificate.Thumbprint})

                        {

                            Write-Verbose "existing $($certificate.Thumbprint)"

                        }

                        else

                        {

                            Write-Verbose "Add $($certificate.Thumbprint)"

                            $x509Store = New-Object System.Security.Cryptography.X509Certificates.X509Store('CA','LocalMachine')

                            $x509Store.Open('ReadWrite')

                            $x509Store.Add($certificate)

                            $x509Store.Dispose()

                        }

                    }

                }

                # Test that the signing certificate is a trusted certificate.

                if ($signingCertificate)

                {

                    if (Test-MicrosoftCertificate -Certificate $signingCertificate)

                    {

                        Write-Verbose "Valid and msft $XmlPath,$($signingCertificate.Thumbprint)"

                        $validSignature = $true

                        $isSignedByMicrosoft = $true

                    }

                    elseif (Test-AlternateRoot -Certificate $signingCertificate)

                    {

                        Write-Verbose "Alt $XmlPath,$($signingCertificate.Thumbprint)"

                        $validSignature = $true

                        $isSignedByMicrosoft = $true

                    }

                    else

                    {

                        Write-Warning "Untrusted $XmlPath,$($signingCertificate.Thumbprint)"

                    }

                }

                else

                {

                    # We did not find a signing certificate, so the signature is not valid.

                    Write-Verbose "Invalid $XmlPath"

                }

            }

        }

    }

    else

    {

        Write-Warning "XML package is unsigned: $XmlPath"

    }

    # Return validation result

    if (-not $validSignature)

    {

        Write-Verbose "XML signature validation failed for: $XmlPath"

        return $false

    }

    return $isSignedByMicrosoft

}

# this function is based on code from PowerShellGet

function Test-MicrosoftCertificate

{

    [CmdletBinding()]

    [OutputType([System.Boolean])]

    param (

        [Parameter(Mandatory = $true)]

        [System.Security.Cryptography.X509Certificates.X509Certificate2]

        $Certificate

    )

    try

    {

        $requiredAssembly = @( [System.Management.Automation.PSCmdlet].Assembly.FullName,

                               [System.Net.IWebProxy].Assembly.FullName,

                               [System.Uri].Assembly.FullName )

        $source = @"

using System;

using System.Net;

using System.Management.Automation;

using Microsoft.Win32.SafeHandles;

using System.Security.Cryptography;

using System.Runtime.InteropServices;

namespace Microsoft.PowerShell.CodeSigning

{

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]

    public struct CERT_CHAIN_POLICY_PARA {

        public CERT_CHAIN_POLICY_PARA(int size) {

            cbSize = (uint) size;

            dwFlags = 0;

            pvExtraPolicyPara = IntPtr.Zero;

        }

        public uint   cbSize;

        public uint   dwFlags;

        public IntPtr pvExtraPolicyPara;

    }

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]

    public struct CERT_CHAIN_POLICY_STATUS {

        public CERT_CHAIN_POLICY_STATUS(int size) {

            cbSize = (uint) size;

            dwError = 0;

            lChainIndex = IntPtr.Zero;

            lElementIndex = IntPtr.Zero;

            pvExtraPolicyStatus = IntPtr.Zero;

        }

        public uint   cbSize;

        public uint   dwError;

        public IntPtr lChainIndex;

        public IntPtr lElementIndex;

        public IntPtr pvExtraPolicyStatus;

    }

    public class Helper

    {

        [DllImport("Crypt32.dll", CharSet=CharSet.Auto, SetLastError=true)]

        public extern static

        bool CertVerifyCertificateChainPolicy(

            [In]     IntPtr                       pszPolicyOID,

            [In]     SafeX509ChainHandle pChainContext,

            [In]     ref CERT_CHAIN_POLICY_PARA   pPolicyPara,

            [In,Out] ref CERT_CHAIN_POLICY_STATUS pPolicyStatus);

        [DllImport("Crypt32.dll", CharSet=CharSet.Auto, SetLastError=true)]

        public static extern

        SafeX509ChainHandle CertDuplicateCertificateChain(

            [In]     IntPtr pChainContext);

        public static bool IsMicrosoftCertificate([In] SafeX509ChainHandle pChainContext)

        {

            const uint MICROSOFT_ROOT_CERT_CHAIN_POLICY_ENABLE_TEST_ROOT_FLAG       = 0x00010000;

            CERT_CHAIN_POLICY_PARA PolicyPara = new CERT_CHAIN_POLICY_PARA(Marshal.SizeOf(typeof(CERT_CHAIN_POLICY_PARA)));

            CERT_CHAIN_POLICY_STATUS PolicyStatus = new CERT_CHAIN_POLICY_STATUS(Marshal.SizeOf(typeof(CERT_CHAIN_POLICY_STATUS)));

            int CERT_CHAIN_POLICY_MICROSOFT_ROOT = 7;

            PolicyPara.dwFlags = (uint) MICROSOFT_ROOT_CERT_CHAIN_POLICY_ENABLE_TEST_ROOT_FLAG;

            if(!CertVerifyCertificateChainPolicy(new IntPtr(CERT_CHAIN_POLICY_MICROSOFT_ROOT),

                                                 pChainContext,

                                                 ref PolicyPara,

                                                 ref PolicyStatus))

            {

                return false;

            }

            return (PolicyStatus.dwError == 0);

        }

    }

}

"@

        Add-Type -ReferencedAssemblies $requiredAssembly -TypeDefinition $source -Language CSharp -ErrorAction Stop

    }

    catch

    {

        Write-Verbose "Error $($_.ToString())"

        return $false

    }

    try

    {

        $X509Chain = New-Object System.Security.Cryptography.X509Certificates.X509Chain

        $null = $X509Chain.Build($Certificate)

    }

    catch

    {

        Write-Verbose "eror $($_.ToString())"

        return $false

    }

    $SafeX509ChainHandle = [Microsoft.PowerShell.CodeSigning.Helper]::CertDuplicateCertificateChain($X509Chain.ChainContext)

    return [Microsoft.PowerShell.CodeSigning.Helper]::IsMicrosoftCertificate($SafeX509ChainHandle)

}

function Test-AlternateRoot

{

    [CmdletBinding()]

    [OutputType([System.Boolean])]

    Param (

        [Parameter(Mandatory = $true)]

        [System.Security.Cryptography.X509Certificates.X509Certificate2]

        $Certificate,

        # Alternate roots are select Microsoft roots published here --> https://www.microsoft.com/pkiops/docs/repository.htm

        [System.String[]]

        $AlternateRoots = @(

            '8F43288AD272F3103B6FB1428485EA3014C0BCFE'

            '3B1EFD3A66EA28B16697394703A72CA340A05BD5'

        )

    )

    $result = $false

    $x509Chain = New-Object -TypeName System.Security.Cryptography.X509Certificates.X509Chain

    $null = $x509Chain.Build($Certificate)

    foreach ($alternateRoot in $AlternateRoots)

    {

        if ($x509Chain.ChainElements.Certificate[-1].Thumbprint -eq $alternateRoot)

        {

            $result = $true

        }

    }

    return $result

}

Test-XMLSignatureByMicrosoft -XmlPath $XmlPath

# SIG # Begin signature block

# MIInKwYJKoZIhvcNAQcCoIInHDCCJxgCAQExDzANBglghkgBZQMEAgEFADB5Bgor

# BgEEAYI3AgEEoGswaTA0BgorBgEEAYI3AgEeMCYCAwEAAAQQH8w7YFlLCE63JNLG

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