WDACSimulation/Compare-SignerAndCertificate.psm1
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# Defining the Signer class from the WDACConfig Namespace if it doesn't already exist if (-NOT ('WDACConfig.Signer' -as [System.Type]) ) { Add-Type -Path "$ModuleRootPath\C#\Signer.cs" } Function Compare-SignerAndCertificate { <# .SYNOPSIS A function that takes a WDAC policy XML file path and a Signed file path as inputs and compares the output of the Get-SignerInfo and Get-CertificateDetails functions Also checks if the file has nested (2nd) signer and will process it accordingly Only returns the result if the file is authorized by the policy using one of the signers .INPUTS System.IO.FileInfo .OUTPUTS ordered .PARAMETER XmlFilePath Path to a WDAC XML file .PARAMETER SignedFilePath Path to a signed file #> [CmdletBinding()] [OutputType([ordered])] param( [Parameter(Mandatory = $true)][System.IO.FileInfo]$XmlFilePath, [Parameter(Mandatory = $true)][System.IO.FileInfo]$SignedFilePath ) begin { # Detecting if Verbose switch is used $PSBoundParameters.Verbose.IsPresent ? ([System.Boolean]$Verbose = $true) : ([System.Boolean]$Verbose = $false) | Out-Null # Importing the $PSDefaultParameterValues to the current session, prior to everything else . "$ModuleRootPath\CoreExt\PSDefaultParameterValues.ps1" # Importing the required sub-modules Import-Module -FullyQualifiedName "$ModuleRootPath\WDACSimulation\Get-SignerInfo.psm1" -Force Import-Module -FullyQualifiedName "$ModuleRootPath\WDACSimulation\Get-NestedSignerSignature.psm1" -Force Import-Module -FullyQualifiedName "$ModuleRootPath\WDACSimulation\Get-CertificateDetails.psm1" -Force Import-Module -FullyQualifiedName "$ModuleRootPath\WDACSimulation\Get-ExtendedFileInfo.psm1" -Force # Get the signer information from the XML file path using the Get-SignerInfo function [WDACConfig.Signer[]]$SignerInfo = Get-SignerInfo -XmlFilePath $XmlFilePath -SignedFilePath $SignedFilePath # Load the XML file as an XML document object [System.Xml.XmlDocument]$Xml = Get-Content -LiteralPath $XmlFilePath # Select the FileAttrib nodes of the XML file [System.Object[]]$PolicyFileAttributes = $Xml.SiPolicy.FileRules.FileAttrib # An ordered hashtable that holds the details of the current file # Values marked as "Gathered from the Get-SignerInfo function" are identical for both primary and nested signers since that function can't know which signer is going to be matched with the primary or nested certificate of a file $CurrentFileInfo = [ordered]@{ #Region Primary Signer SignerID = '' # Gathered from the Get-SignerInfo function SignerName = '' # Gathered from the Get-SignerInfo function SignerCertRoot = '' # Gathered from the Get-SignerInfo function SignerCertPublisher = '' # Gathered from the Get-SignerInfo function HasEKU = $false # Gathered from the Get-SignerInfo function EKUOID = @() # Gathered from the Get-SignerInfo function EKUsMatch = $false # Gathered from the Get-SignerInfo function SignerScope = '' # Gathered from the Get-SignerInfo function HasFileAttrib = $false # Gathered from the Get-SignerInfo function SignerFileAttributeIDs = @() # Gathered from the Get-SignerInfo function MatchCriteria = '' SpecificFileNameLevelMatchCriteria = '' # Only those eligible for FilePublisher or SignedVersion levels assign this value, otherwise it stays empty CertSubjectCN = '' CertIssuerCN = '' CertNotAfter = '' CertTBSValue = '' CertRootMatch = $false CertNameMatch = $false CertPublisherMatch = $false #Endregion Primary Signer #Region Nested Signer HasNestedCert = $false NestedSignerID = '' # Gathered from the Get-SignerInfo function NestedSignerName = '' # Gathered from the Get-SignerInfo function NestedSignerCertRoot = '' # Gathered from the Get-SignerInfo function NestedSignerCertPublisher = '' # Gathered from the Get-SignerInfo function NestedHasEKU = $false # Gathered from the Get-SignerInfo function NestedEKUOID = @() # Gathered from the Get-SignerInfo function NestedEKUsMatch = $false # Gathered from the Get-SignerInfo function NestedSignerScope = '' # Gathered from the Get-SignerInfo function NestedHasFileAttrib = $false # Gathered from the Get-SignerInfo function NestedSignerFileAttributeIDs = @() # Gathered from the Get-SignerInfo function NestedMatchCriteria = '' NestedSpecificFileNameLevelMatchCriteria = '' # Only those eligible for FilePublisher or SignedVersion levels assign this value, otherwise it stays empty NestedCertSubjectCN = '' NestedCertIssuerCN = '' NestedCertNotAfter = '' NestedCertTBSValue = '' NestedCertRootMatch = $false NestedCertNameMatch = $false NestedCertPublisherMatch = $false #Endregion Nested Signer FilePath = $SignedFilePath } # Get details of the intermediate and leaf certificates of the primary certificate of the signed file [System.Object[]]$AllPrimaryCertificateDetails = Get-CertificateDetails -FilePath $SignedFilePath # Store the intermediate certificate(s) details of the Primary certificate of the signed file [System.Object[]]$PrimaryCertificateIntermediateDetails = $AllPrimaryCertificateDetails.IntermediateCertificates # Store the leaf certificate details of the Primary Certificate of the signed file [System.Object]$PrimaryCertificateLeafDetails = $AllPrimaryCertificateDetails.LeafCertificate # Get the Nested (Secondary) certificate of the signed file, if any [System.Management.Automation.Signature]$ExtraCertificateDetails = Get-NestedSignerSignature -FilePath $SignedFilePath # Extract the Nested (Secondary) certificate from the nested property, if any $NestedCertificate = ($ExtraCertificateDetails).NestedSignature.SignerCertificate # If the signed file has a nested certificate if ($null -ne [System.Security.Cryptography.X509Certificates.X509Certificate2]$NestedCertificate) { # First get the CN of the leaf certificate of the nested Certificate $NestedCertificate.Subject -match 'CN=(?<InitialRegexTest1>.*?),.*' | Out-Null $LeafCNOfTheNestedCertificate = $matches['InitialRegexTest1'] -like '*"*' ? ($NestedCertificate.Subject -split 'CN="(.+?)"')[1] : $matches['InitialRegexTest1'] Write-Verbose -Message 'Found a nested Signer in the file' # Send the nested certificate along with its Leaf certificate's CN to the Get-CertificateDetails function in order to get the intermediate and leaf certificates details of the Nested certificate [System.Object[]]$AllNestedCertificateDetails = Get-CertificateDetails -X509Certificate2 $NestedCertificate -LeafCNOfTheNestedCertificate $LeafCNOfTheNestedCertificate # Store the intermediate certificate(s) details of the Nested certificate from the signed file [System.Object[]]$NestedCertificateIntermediateDetails = $AllNestedCertificateDetails.IntermediateCertificates # Get the leaf certificate details of the Nested Certificate from the signed file [System.Object]$NestedCertificateLeafDetails = $AllNestedCertificateDetails.LeafCertificate # If the leaf certificate of the nested signer is the same as the leaf certificate of the primary signer # Set the flag for the file having nested certificate to $false because the WDAC policy only creates signer for one of them and checking for 2nd signer naturally causes inaccurate results if ($NestedCertificateLeafDetails.TBSValue -eq $PrimaryCertificateLeafDetails.TBSValue) { Write-Verbose -Message 'The Leaf Certificates of the primary and nested signers are the same' $CurrentFileInfo.HasNestedCert = $false } else { # The file has a nested certificate $CurrentFileInfo.HasNestedCert = $true } } # Assign indicators/flags to ascertain if a primary or nested signer was located, thereby avoiding redundant iterations of their loops # Initialize them to $False until a nested loop identifies a match # Owing to the complexity of the loops in those regions, a label is employed to exit multiple loops simultaneously [System.Boolean]$FoundMatchPrimary = $false [System.Boolean]$FoundMatchNested = $false # Initialize the flag to indicate if the file's extended info is available in the current session [System.Boolean]$FileExtendedInfoAvailable = $false # Due to the fuzzy searching nature of signers and matching them with the file's certificates, it's possible that a signer can match at multiple levels # The following flags are used to indicate that if a match was not already found for the primary signer in a 3-way match (FilePublisher, Publisher or SignedVersion levels) # Then the loop must keep going and only once it's exhausted all the signers for those 3 levels then it can move to other levels # This improves the accuracy in policies where SignedVersion level is used. A file could be prematurely matched with PCA/Root certificate levels while it could've been matched with higher levels had the loop continued # Initialize the flag to indicate if a match was found for the primary signer in a 3-way match (FilePublisher, Publisher or SignedVersion levels) [System.Boolean]$FoundMatchPrimary3Way = $false # Initialize the flag to indicate if a match was found for the nested signer in a 3-way match (FilePublisher, Publisher or SignedVersion levels) [System.Boolean]$FoundMatchNested3Way = $false } Process { # Loop through each signer in the signer information array, These are the signers in the XML policy file foreach ($Signer in $SignerInfo) { if ($FoundMatchPrimary3Way -and $FoundMatchNested3Way) { # Exit the process block if a match was already found for both the primary and nested signers, and stop trying other signers Return } # If a match wasn't already found for the primary signer if (-NOT $FoundMatchPrimary3Way) { # Loop through each of the file's primary signer certificate's intermediate certificates :PrimaryCertLoopLabel foreach ($Certificate in $PrimaryCertificateIntermediateDetails) { # Checking for FilePublisher, Publisher or SignedVersion levels eligibility # 1) Check if the Signer's CertRoot (referring to the TBS value in the xml file which belongs to an intermediate cert of the file) # Matches the TBSValue of one of the file's intermediate certificates # 2) Check if the signer's name (Referring to the one in the XML file) matches the same Intermediate certificate's SubjectCN # 3) Check if the signer's CertPublisher (aka Leaf Certificate's CN used in the xml policy) matches the leaf certificate's SubjectCN (of the file) if (($Signer.CertRoot -eq $Certificate.TBSValue) -and ($Signer.Name -eq $Certificate.SubjectCN) -and ($Signer.CertPublisher -eq $PrimaryCertificateLeafDetails.SubjectCN)) { # At this point we know the Signer is either FilePublisher, Publisher or SignedVersion level, but we need to narrow it down # Check if the signer has FileAttrib indicating that it was generated either with FilePublisher or SignedVersion level if ($Signer.HasFileAttrib) { # Get the extended file attributes as ordered hashtable $ExtendedFileInfo = Get-ExtendedFileInfo -Path $SignedFilePath # Get the current file's version [System.Version]$FileVersion = (Get-Item -LiteralPath $SignedFilePath).VersionInfo.FileVersionRaw # If the file version couldn't be retrieved from the file using Get-Item cmdlet if (-NOT $FileVersion) { # Create a Shell.Application object [System.__ComObject]$Shell = New-Object -ComObject Shell.Application # Get the folder and file names from the path [System.String]$Folder = Split-Path $Path [System.String]$File = Split-Path $Path -Leaf # Get the ShellFolder and ShellFile objects from the Shell.Application object [System.__ComObject]$ShellFolder = $Shell.Namespace($Folder) [System.__ComObject]$ShellFile = $ShellFolder.ParseName($File) # Get the file version from the ShellFile object using the 166th property ID [System.Version]$FileVersion = $ShellFolder.GetDetailsOf($ShellFile, 166) # Release the Shell.Application object [Runtime.InteropServices.Marshal]::ReleaseComObject($Shell) | Out-Null } # Set the flag to indicate that the file's extended info have has collected and are available in the current session $FileExtendedInfoAvailable = $True # Get all of the file attributes in the policy XML file whose IDs are in the Signer's FileAttribRef IDs array and the file's version is equal or greater than the minimum version specified in the FileAttrib [System.Xml.XmlElement[]]$PrimaryCandidatePolicyFileAttributes = ($PolicyFileAttributes | Where-Object -FilterScript { ($Signer.SignerFileAttributeIDs -contains $_.ID) -and ($FileVersion -ge [system.version]$_.MinimumFileVersion) }) # If the signer has a file attribute with a wildcard file name, then it's a SignedVersion level signer # These signers have only 1 FileAttribRef and only point to a single FileAttrib # If a SignedVersion signer applies to multiple files, the version number of the FileAttrib is set to the minimum version of the files if (($PrimaryCandidatePolicyFileAttributes.count -eq 1) -and ($PrimaryCandidatePolicyFileAttributes.FileName -eq '*')) { $CurrentFileInfo.SignerID = $Signer.ID $CurrentFileInfo.SignerName = $Signer.Name $CurrentFileInfo.SignerCertRoot = $Signer.CertRoot $CurrentFileInfo.SignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.HasEKU = $Signer.HasEKU $CurrentFileInfo.EKUOID = $Signer.EKUOID $CurrentFileInfo.EKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.SignerScope = $Signer.SignerScope $CurrentFileInfo.HasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.SignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.SpecificFileNameLevelMatchCriteria = 'Version' $CurrentFileInfo.MatchCriteria = 'SignedVersion' $CurrentFileInfo.CertSubjectCN = $Certificate.SubjectCN $CurrentFileInfo.CertIssuerCN = $Certificate.IssuerCN $CurrentFileInfo.CertNotAfter = $Certificate.NotAfter $CurrentFileInfo.CertTBSValue = $Certificate.TBSValue $CurrentFileInfo.CertRootMatch = $true $CurrentFileInfo.CertNameMatch = $true $CurrentFileInfo.CertPublisherMatch = $true # Set the flag to indicate that a match was found $FoundMatchPrimary = $true # Set a flag to indicate that a match was found for the nested signer in a 3-way match $FoundMatchPrimary3Way = $true break PrimaryCertLoopLabel } # Loop over all of the candidate file attributes to find a match with the file's extended info foreach ($FileAttrib in $PrimaryCandidatePolicyFileAttributes) { # Loop over all of the keys in the extended file info to see which one of them is a match, to determine the SpecificFileNameLevel option foreach ($KeyItem in $ExtendedFileInfo.Keys) { if ($ExtendedFileInfo.$KeyItem -eq $FileAttrib.$KeyItem) { Write-Verbose -Message "The SpecificFileNameLevel is $KeyItem" # If there was a match then assign the $KeyItem which is the name of the SpecificFileNameLevel option to the $CurrentFileInfo.SpecificFileNameLevelMatchCriteria # And break out of the loop by validating the signer as suitable for FilePublisher level $CurrentFileInfo.SignerID = $Signer.ID $CurrentFileInfo.SignerName = $Signer.Name $CurrentFileInfo.SignerCertRoot = $Signer.CertRoot $CurrentFileInfo.SignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.HasEKU = $Signer.HasEKU $CurrentFileInfo.EKUOID = $Signer.EKUOID $CurrentFileInfo.EKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.SignerScope = $Signer.SignerScope $CurrentFileInfo.HasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.SignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.SpecificFileNameLevelMatchCriteria = [System.String]$KeyItem $CurrentFileInfo.MatchCriteria = 'FilePublisher' $CurrentFileInfo.CertSubjectCN = $Certificate.SubjectCN $CurrentFileInfo.CertIssuerCN = $Certificate.IssuerCN $CurrentFileInfo.CertNotAfter = $Certificate.NotAfter $CurrentFileInfo.CertTBSValue = $Certificate.TBSValue $CurrentFileInfo.CertRootMatch = $true $CurrentFileInfo.CertNameMatch = $true $CurrentFileInfo.CertPublisherMatch = $true # Set the flag to indicate that a match was found $FoundMatchPrimary = $true # Set a flag to indicate that a match was found for the nested signer in a 3-way match $FoundMatchPrimary3Way = $true break PrimaryCertLoopLabel } } } } else { $CurrentFileInfo.SignerID = $Signer.ID $CurrentFileInfo.SignerName = $Signer.Name $CurrentFileInfo.SignerCertRoot = $Signer.CertRoot $CurrentFileInfo.SignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.HasEKU = $Signer.HasEKU $CurrentFileInfo.EKUOID = $Signer.EKUOID $CurrentFileInfo.EKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.SignerScope = $Signer.SignerScope $CurrentFileInfo.HasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.SignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.MatchCriteria = 'Publisher' $CurrentFileInfo.CertSubjectCN = $Certificate.SubjectCN $CurrentFileInfo.CertIssuerCN = $Certificate.IssuerCN $CurrentFileInfo.CertNotAfter = $Certificate.NotAfter $CurrentFileInfo.CertTBSValue = $Certificate.TBSValue $CurrentFileInfo.CertRootMatch = $true $CurrentFileInfo.CertNameMatch = $true $CurrentFileInfo.CertPublisherMatch = $true # Set the flag to indicate that a match was found $FoundMatchPrimary = $true # Set a flag to indicate that a match was found for the nested signer in a 3-way match $FoundMatchPrimary3Way = $true break PrimaryCertLoopLabel } } # Checking for PcaCertificate, RootCertificate levels eligibility # Check if the Signer's CertRoot (referring to the TBS value in the xml file which belongs to an intermediate cert of the file) # Matches the TBSValue of one of the file's intermediate certificates # Check if the signer's name (Referring to the one in the XML file) matches the same Intermediate certificate's SubjectCN elseif (($Signer.CertRoot -eq $Certificate.TBSValue) -and ($Signer.Name -eq $Certificate.SubjectCN)) { $CurrentFileInfo.SignerID = $Signer.ID $CurrentFileInfo.SignerName = $Signer.Name $CurrentFileInfo.SignerCertRoot = $Signer.CertRoot $CurrentFileInfo.SignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.HasEKU = $Signer.HasEKU $CurrentFileInfo.EKUOID = $Signer.EKUOID $CurrentFileInfo.EKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.SignerScope = $Signer.SignerScope $CurrentFileInfo.HasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.SignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.MatchCriteria = 'PcaCertificate/RootCertificate' $CurrentFileInfo.CertSubjectCN = $Certificate.SubjectCN $CurrentFileInfo.CertIssuerCN = $Certificate.IssuerCN $CurrentFileInfo.CertNotAfter = $Certificate.NotAfter $CurrentFileInfo.CertTBSValue = $Certificate.TBSValue $CurrentFileInfo.CertRootMatch = $true $CurrentFileInfo.CertNameMatch = $true $CurrentFileInfo.CertPublisherMatch = $false # Set the flag to indicate that a match was found $FoundMatchPrimary = $true break PrimaryCertLoopLabel } # Checking for LeafCertificate level eligibility # Check if the Signer's CertRoot (referring to the TBS value in the xml file, which belongs to the leaf certificate of the file when LeafCertificate level is used) # Matches the TBSValue of the file's Leaf certificate certificates # Check if the signer's name (Referring to the one in the XML file) matches the Leaf certificate's SubjectCN elseif (($Signer.CertRoot -eq $PrimaryCertificateLeafDetails.TBSValue) -and ($Signer.Name -eq $PrimaryCertificateLeafDetails.SubjectCN)) { $CurrentFileInfo.SignerID = $Signer.ID $CurrentFileInfo.SignerName = $Signer.Name $CurrentFileInfo.SignerCertRoot = $Signer.CertRoot $CurrentFileInfo.SignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.HasEKU = $Signer.HasEKU $CurrentFileInfo.EKUOID = $Signer.EKUOID $CurrentFileInfo.EKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.MatchCriteria = 'LeafCertificate' $CurrentFileInfo.SignerScope = $Signer.SignerScope $CurrentFileInfo.HasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.SignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.CertSubjectCN = $PrimaryCertificateLeafDetails.SubjectCN $CurrentFileInfo.CertIssuerCN = $PrimaryCertificateLeafDetails.IssuerCN $CurrentFileInfo.CertNotAfter = $PrimaryCertificateLeafDetails.NotAfter $CurrentFileInfo.CertTBSValue = $PrimaryCertificateLeafDetails.TBSValue $CurrentFileInfo.CertRootMatch = $true $CurrentFileInfo.CertNameMatch = $true $CurrentFileInfo.CertPublisherMatch = $false # Set the flag to indicate that a match was found $FoundMatchPrimary = $true break PrimaryCertLoopLabel } } } # if the file has a nested certificate if ($CurrentFileInfo.HasNestedCert) { # If a match wasn't already found for the nested signer if (-NOT $FoundMatchNested3Way) { :NestedCertLoopLabel foreach ($NestedCertificate in $NestedCertificateIntermediateDetails) { # FilePublisher, Publisher and SignedVersion levels eligibility check if (($Signer.CertRoot -eq $NestedCertificate.TBSValue) -and ($Signer.Name -eq $NestedCertificate.SubjectCN) -and ($Signer.CertPublisher -eq $NestedCertificateLeafDetails.SubjectCN)) { # At this point we know the Nested Signer is either FilePublisher, Publisher or SignedVersion level, but we need to narrow it down # Check if the signer has FileAttrib indicating that it was generated either with FilePublisher or SignedVersion level if ($Signer.HasFileAttrib) { # If the file's extended info is not available in the current session then get them if (-NOT $FileExtendedInfoAvailable) { # Get the extended file attributes as ordered hashtable $ExtendedFileInfo = Get-ExtendedFileInfo -Path $SignedFilePath # Get the current file's version [System.Version]$FileVersion = (Get-Item -LiteralPath $SignedFilePath).VersionInfo.FileVersionRaw # If the file version couldn't be retrieved from the file using Get-Item cmdlet if (-NOT $FileVersion) { # Create a Shell.Application object [System.__ComObject]$Shell = New-Object -ComObject Shell.Application # Get the folder and file names from the path [System.String]$Folder = Split-Path $Path [System.String]$File = Split-Path $Path -Leaf # Get the ShellFolder and ShellFile objects from the Shell.Application object [System.__ComObject]$ShellFolder = $Shell.Namespace($Folder) [System.__ComObject]$ShellFile = $ShellFolder.ParseName($File) # Get the file version from the ShellFile object using the 166th property ID [System.Version]$FileVersion = $ShellFolder.GetDetailsOf($ShellFile, 166) # Release the Shell.Application object [Runtime.InteropServices.Marshal]::ReleaseComObject($Shell) | Out-Null } } # Get all of the file attributes in the policy XML file whose IDs are in the Nested Signer's FileAttribRef IDs array and the file's version is equal or greater than the minimum version specified in the FileAttrib [System.Xml.XmlElement[]]$NestedCandidatePolicyFileAttributes = ($PolicyFileAttributes | Where-Object -FilterScript { ($Signer.SignerFileAttributeIDs -contains $_.ID) }) # If the signer has a file attribute with a wildcard file name, then it's a SignedVersion level signer # These signers have only 1 FileAttribRef and only point to a single FileAttrib # If a SignedVersion signer applies to multiple files, the version number of the FileAttrib is set to the minimum version of the files if (($NestedCandidatePolicyFileAttributes.count -eq 1) -and ($NestedCandidatePolicyFileAttributes.FileName -eq '*')) { $CurrentFileInfo.NestedSignerID = $Signer.ID $CurrentFileInfo.NestedSignerName = $Signer.Name $CurrentFileInfo.NestedSignerCertRoot = $Signer.CertRoot $CurrentFileInfo.NestedSignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.NestedHasEKU = $Signer.HasEKU $CurrentFileInfo.NestedEKUOID = $Signer.EKUOID $CurrentFileInfo.NestedEKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.NestedSignerScope = $Signer.SignerScope $CurrentFileInfo.NestedHasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.NestedSignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.NestedSpecificFileNameLevelMatchCriteria = 'Version' $CurrentFileInfo.NestedMatchCriteria = 'SignedVersion' $CurrentFileInfo.NestedCertSubjectCN = $NestedCertificate.SubjectCN $CurrentFileInfo.NestedCertIssuerCN = $NestedCertificate.IssuerCN $CurrentFileInfo.NestedCertNotAfter = $NestedCertificate.NotAfter $CurrentFileInfo.NestedCertTBSValue = $NestedCertificate.TBSValue $CurrentFileInfo.NestedCertRootMatch = $true $CurrentFileInfo.NestedCertNameMatch = $true $CurrentFileInfo.NestedCertPublisherMatch = $true # Set the flag to indicate that a match was found $FoundMatchNested = $true # Set a flag to indicate that a match was found for the nested signer in a 3-way match $FoundMatchNested3Way = $true break NestedCertLoopLabel } # Loop over all of the candidate file attributes to find a match with the file's extended info foreach ($FileAttrib in $NestedCandidatePolicyFileAttributes) { # Loop over all of the keys in the extended file info to see which one of them is a match, to determine the SpecificFileNameLevel option foreach ($KeyItem in $ExtendedFileInfo.Keys) { if ($ExtendedFileInfo.$KeyItem -eq $FileAttrib.$KeyItem) { Write-Verbose -Message "The SpecificFileNameLevel is $KeyItem" # If there was a match then assign the $KeyItem which is the name of the SpecificFileNameLevel option to the $CurrentFileInfo.NestedSpecificFileNameLevelMatchCriteria # And break out of the loop by validating the signer as suitable for FilePublisher level $CurrentFileInfo.NestedSignerID = $Signer.ID $CurrentFileInfo.NestedSignerName = $Signer.Name $CurrentFileInfo.NestedSignerCertRoot = $Signer.CertRoot $CurrentFileInfo.NestedSignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.NestedHasEKU = $Signer.HasEKU $CurrentFileInfo.NestedEKUOID = $Signer.EKUOID $CurrentFileInfo.NestedEKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.NestedSignerScope = $Signer.SignerScope $CurrentFileInfo.NestedHasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.NestedSignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.NestedSpecificFileNameLevelMatchCriteria = [System.String]$KeyItem $CurrentFileInfo.NestedMatchCriteria = 'FilePublisher' $CurrentFileInfo.NestedCertSubjectCN = $NestedCertificate.SubjectCN $CurrentFileInfo.NestedCertIssuerCN = $NestedCertificate.IssuerCN $CurrentFileInfo.NestedCertNotAfter = $NestedCertificate.NotAfter $CurrentFileInfo.NestedCertTBSValue = $NestedCertificate.TBSValue $CurrentFileInfo.NestedCertRootMatch = $true $CurrentFileInfo.NestedCertNameMatch = $true $CurrentFileInfo.NestedCertPublisherMatch = $true # Set the flag to indicate that a match was found $FoundMatchNested = $true # Set a flag to indicate that a match was found for the nested signer in a 3-way match $FoundMatchNested3Way = $true break NestedCertLoopLabel } } } } else { $CurrentFileInfo.NestedSignerID = $Signer.ID $CurrentFileInfo.NestedSignerName = $Signer.Name $CurrentFileInfo.NestedSignerCertRoot = $Signer.CertRoot $CurrentFileInfo.NestedSignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.NestedHasEKU = $Signer.HasEKU $CurrentFileInfo.NestedEKUOID = $Signer.EKUOID $CurrentFileInfo.NestedEKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.NestedSignerScope = $Signer.SignerScope $CurrentFileInfo.NestedHasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.NestedSignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.NestedMatchCriteria = 'Publisher' $CurrentFileInfo.NestedCertSubjectCN = $NestedCertificate.SubjectCN $CurrentFileInfo.NestedCertIssuerCN = $NestedCertificate.IssuerCN $CurrentFileInfo.NestedCertNotAfter = $NestedCertificate.NotAfter $CurrentFileInfo.NestedCertTBSValue = $NestedCertificate.TBSValue $CurrentFileInfo.NestedCertRootMatch = $true $CurrentFileInfo.NestedCertNameMatch = $true $CurrentFileInfo.NestedCertPublisherMatch = $true # Set the flag to indicate that a match was found $FoundMatchNested = $true # Set a flag to indicate that a match was found for the nested signer in a 3-way match $FoundMatchNested3Way = $true break NestedCertLoopLabel } } # PcaCertificate, RootCertificate levels eligibility check elseif (($Signer.CertRoot -eq $NestedCertificate.TBSValue) -and ($Signer.Name -eq $NestedCertificate.SubjectCN)) { $CurrentFileInfo.NestedSignerID = $Signer.ID $CurrentFileInfo.NestedSignerName = $Signer.Name $CurrentFileInfo.NestedSignerCertRoot = $Signer.CertRoot $CurrentFileInfo.NestedSignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.NestedHasEKU = $Signer.HasEKU $CurrentFileInfo.NestedEKUOID = $Signer.EKUOID $CurrentFileInfo.NestedEKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.NestedSignerScope = $Signer.SignerScope $CurrentFileInfo.NestedHasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.NestedSignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.NestedMatchCriteria = 'PcaCertificate/RootCertificate' $CurrentFileInfo.NestedCertSubjectCN = $NestedCertificate.SubjectCN $CurrentFileInfo.NestedCertIssuerCN = $NestedCertificate.IssuerCN $CurrentFileInfo.NestedCertNotAfter = $NestedCertificate.NotAfter $CurrentFileInfo.NestedCertTBSValue = $NestedCertificate.TBSValue $CurrentFileInfo.NestedCertRootMatch = $true $CurrentFileInfo.NestedCertNameMatch = $true $CurrentFileInfo.NestedCertPublisherMatch = $false # Set the flag to indicate that a match was found $FoundMatchNested = $true break NestedCertLoopLabel } # LeafCertificate level eligibility check elseif (($Signer.CertRoot -eq $NestedCertificateLeafDetails.TBSValue) -and ($Signer.Name -eq $NestedCertificateLeafDetails.SubjectCN)) { $CurrentFileInfo.NestedSignerID = $Signer.ID $CurrentFileInfo.NestedSignerName = $Signer.Name $CurrentFileInfo.NestedSignerCertRoot = $Signer.CertRoot $CurrentFileInfo.NestedSignerCertPublisher = $Signer.CertPublisher $CurrentFileInfo.NestedHasEKU = $Signer.HasEKU $CurrentFileInfo.NestedEKUOID = $Signer.EKUOID $CurrentFileInfo.NestedEKUsMatch = $Signer.EKUsMatch $CurrentFileInfo.NestedSignerScope = $Signer.SignerScope $CurrentFileInfo.NestedHasFileAttrib = $Signer.HasFileAttrib $CurrentFileInfo.NestedSignerFileAttributeIDs = $Signer.SignerFileAttributeIDs $CurrentFileInfo.NestedMatchCriteria = 'LeafCertificate' $CurrentFileInfo.NestedCertSubjectCN = $NestedCertificateLeafDetails.SubjectCN $CurrentFileInfo.NestedCertIssuerCN = $NestedCertificateLeafDetails.IssuerCN $CurrentFileInfo.NestedCertNotAfter = $NestedCertificateLeafDetails.NotAfter $CurrentFileInfo.NestedCertTBSValue = $NestedCertificateLeafDetails.TBSValue $CurrentFileInfo.NestedCertRootMatch = $true $CurrentFileInfo.NestedCertNameMatch = $true $CurrentFileInfo.NestedCertPublisherMatch = $false # Set the flag to indicate that a match was found $FoundMatchNested = $true break NestedCertLoopLabel } } } } } } End { # if the file's primary signer is authorized at least by one criteria and its criteria is not empty if (-NOT ([System.String]::IsNullOrWhiteSpace($CurrentFileInfo.MatchCriteria))) { Write-Verbose -Message "The primary signer is authorized by the criteria: $($CurrentFileInfo.MatchCriteria) by the following SignerID: $($CurrentFileInfo.SignerID)" # If the file has a nested signer if ($CurrentFileInfo.HasNestedCert -eq $true) { # If the file's nested signer is authorized at least by one criteria and its criteria is not empty if (-NOT ([System.String]::IsNullOrWhiteSpace($CurrentFileInfo.NestedMatchCriteria))) { Write-Verbose -Message "The nested signer is authorized by the criteria: $($CurrentFileInfo.NestedMatchCriteria) by the following SignerID: $($CurrentFileInfo.NestedSignerID)" # Return the comparison result of the given file if there is no nested signer Return $CurrentFileInfo } else { Write-Verbose -Message 'The primary signer is authorized but the nested signer is not authorized' Return } } else { # Return the comparison result of the given file with primary signer only, if there is no nested signer Return $CurrentFileInfo } } else { # Do nothing since the file's primary signer is not authorized, let alone the nested signer Return } } } Export-ModuleMember -Function 'Compare-SignerAndCertificate' # SIG # Begin signature block # MIILkgYJKoZIhvcNAQcCoIILgzCCC38CAQExDzANBglghkgBZQMEAgEFADB5Bgor # BgEEAYI3AgEEoGswaTA0BgorBgEEAYI3AgEeMCYCAwEAAAQQH8w7YFlLCE63JNLG # KX7zUQIBAAIBAAIBAAIBAAIBADAxMA0GCWCGSAFlAwQCAQUABCCXHNvEtgWNm6yQ # qNgkzmpRByZwQDu2goxzPvv1BTokQ6CCB9AwggfMMIIFtKADAgECAhMeAAAABI80 # LDQz/68TAAAAAAAEMA0GCSqGSIb3DQEBDQUAME8xEzARBgoJkiaJk/IsZAEZFgNj # b20xIjAgBgoJkiaJk/IsZAEZFhJIT1RDQUtFWC1DQS1Eb21haW4xFDASBgNVBAMT # C0hPVENBS0VYLUNBMCAXDTIzMTIyNzExMjkyOVoYDzIyMDgxMTEyMTEyOTI5WjB5 # MQswCQYDVQQGEwJVSzEeMBwGA1UEAxMVSG90Q2FrZVggQ29kZSBTaWduaW5nMSMw # IQYJKoZIhvcNAQkBFhRob3RjYWtleEBvdXRsb29rLmNvbTElMCMGCSqGSIb3DQEJ # ARYWU3B5bmV0Z2lybEBvdXRsb29rLmNvbTCCAiIwDQYJKoZIhvcNAQEBBQADggIP # 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