GuardedFabricTools

1.0.0

AttestationReport/AttestationReport.psm1

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

# Licensed under the MIT License.

# Creation of an attestation report class to have meaningful data and formatting

class AttestationReport

{

    [DateTime] $Time

    [string] $HostName

    [string] $AttestationOperationMode

    [string] $AttestationStatus

    [string] $AttestationSubStatus

    [string] $AuthorizedHostGroup

    [string] $EndorsementKeyHash

}

#region Constants

$script:AttestationEventProviderName = "Microsoft-Windows-HostGuardianService-Attestation"

# The telling event that an attestation request passed.

$script:TcgLogValidationEventId = 1203

# AD based attestation status events

$script:AttestationAdStatusEvents = 

@{

    1519 = "Passed";

    1524 = "UnauthorizedHost"

}

$script:AttestationTpmSubStatusEvents = 

@{

        1500 = "NoInformation";

        1508 = "SecureBoot";

        1510 = "DebugMode";

        1513 = "CodeIntegrityPolicy";

        1523 = "NoInformation";

        1533 = "Iommu";

        1534 = "VirtualSecureMode";

        1535 = "PagefileEncryption";

        1536 = "BitLocker";

        1537 = "HypervisorEnforcedCodeIntegrityPolicy";

        1538 = "CodeIntegrityPolicy";

        1539 = "HibernationEnabled";

        1540 = "DumpsEnabled";

        1541 = "DumpEncryption";

        1542 = "DumpEncryptionKey"

}

$script:AttestationTpmStatusEvents =

@{

        1500 = "UnauthorizedHost";

        1508 = "InsecureHostConfiguration";

        1510 = "InsecureHostConfiguration";

        1513 = "InsecureHostConfiguration";

        1523 = "Passed";

        1533 = "InsecureHostConfiguration";

        1534 = "InsecureHostConfiguration";

        1535 = "InsecureHostConfiguration";

        1536 = "InsecureHostConfiguration";

        1537 = "InsecureHostConfiguration";

        1538 = "InsecureHostConfiguration";

        1539 = "InsecureHostConfiguration";

        1540 = "InsecureHostConfiguration";

        1541 = "InsecureHostConfiguration";

        1542 = "InsecureHostConfiguration";

}

#endregion

<#

.Synopsis

   Generates a report of attestation requests done by an HGS server

.DESCRIPTION

   The Get-HgsAttestationReport cmdlet obtains events from the HostGuardianService-Attestation event provider, and parses them to find the past attestation requests handled by this HGS Server.

   When running this cmdlet on or target in an HGS server that is a member of a cluster, it will attempt to find relevant events from all nodes.

   If -AD or -TPM is not passed through, it will report attestation requests of the current operation mode.

.EXAMPLE

   Get-HgsAttestationReport -AD -Tpm -StartTime (Get-Date).AddDays(-7)

   Generates a report of all AD and TPM based attestation requests handled by the targeted HGS server for the past seven days.

.EXAMPLE

   $cred = Get-Credential

   Get-HgsAttestationReport -ComputerName HgsServer.Contoso.Com -Credential $cred

   Generates a report of all attestation requests of the current operation mode handled by the targeted HGS server as far back as the event logs go.

#>

function Get-HgsAttestationReport

{

    [CmdletBinding(DefaultParameterSetName = 'LocalComputer')]

    param

    (

        # Specifies the earliest date to look for events

        [Parameter(Mandatory = $false)]

        [Alias("NotBefore")]

        [DateTime]

        $StartTime = [System.DateTime]::MinValue,

        # Specifies the latest date to look for events

        [Parameter(Mandatory = $false)]

        [Alias("NotAfter")]

        [DateTime] 

        $EndTime = [System.DateTime]::MaxValue,

        # Specifies if the parser should look for AD based attestation requests. If both -AD and -Tpm are not present, the search defaults to the target's current Attestation Operation Mode.

        [Alias("ParseADRequests")]

        [Parameter(Mandatory = $false)]

        [Switch]

        $AD,

        # Specifies if the parser should look for Tpm based attestation requests. If both -AD and -Tpm are not present, the search defaults to the target's current Attestation Operation Mode.

        [Parameter(Mandatory = $false)]

        [Alias("ParseTpmRequests")]

        [switch]

        $Tpm,

        # The name of the target computer.

        [Parameter(Mandatory = $true, ParameterSetName = "RemoteComputer")]

        [String]

        $ComputerName,

        # Credentials for invoking commands on the target computer

        [Parameter(Mandatory = $true, ParameterSetName = "RemoteComputer")]

        [PSCredential]

        $Credential,

        # PSSession Configuration Name for invoking commands

        [Parameter(Mandatory = $false)]

        [Alias("ConfigurationName")]

        [String]

        $EndpointName = "Microsoft.PowerShell"

    )

    if ($PSCmdlet.ParameterSetName -eq "LocalComputer")

    {

        try 

        {

            $HgsServerInfo = Get-HgsServer -ErrorAction Stop    

        }

        catch [Exception] 

        {

            Write-Error $_

            break

        }

    }

    else

    {

        try 

        {

            $HgsServerInfo = Invoke-Command -ComputerName $ComputerName -Credential $Credential -ConfigurationName $EndpointName -ScriptBlock {Get-HgsServer} -ErrorAction Stop   

        }

        catch [Exception] 

        {

            Write-Error $_

            break

        }

    }

    # In the case of multiple nodes

    $HgsServerNodeNames = @()

    switch ($PSCmdlet.ParameterSetName)

    {

        "LocalComputer" { $HgsServerNodeNames += (Get-ClusterNode | Where-Object {$_.State -eq "Up"}).Name }

        "RemoteComputer" {$HgsServerNodeNames += (Invoke-Command -ComputerName $ComputerName -Credential $Credential -ConfigurationName $EndpointName -ScriptBlock {Get-ClusterNode}).Name}

    }

    if ($HgsServerNodeNames.Count -gt 1)

    {

        switch ($PSCmdlet.ParameterSetName)

        {

            "LocalComputer" { 

                Write-Warning ("This host is not the only member of the Host Guardian Service instance '{0}'. To collect all attestation requests handled by this instance, run this script targeting all of the machines of this instance: {1}" -f $HgsServerInfo.AttestationUrl[0].Host, ($HgsServerNodeNames -join "; "))

            }

            "RemoteComputer" 

            {

                # This will still give the netBIOS name even if the input computername is the netBIOS

                Write-Warning ("The host '{0}' is not the only member of the Host Guardian Service instance '{1}'. To collect all attestation requests handled by this instance, run this script targeting all of the machines of this instance: {2}" -f $ComputerName,$HgsServerInfo.AttestationUrl[0].Host, ($HgsServerNodeNames -join "; "))

            }

        }

    }

    if (!$Tpm -and !$AD)

    {

        # If we can get the current attestation operation mode, use that.

        if ($HgsServerInfo.AttestationOperationMode.Value -eq "Tpm" -or $HgsServerInfo.AttestationOperationMode -eq "Tpm")

        {

            $Tpm = $true

        }

        else 

        {

            $AD = $true    

        }

    }

    $EventIds = @()

    if ($AD)

    {

        $EventIds += $script:AttestationAdStatusEvents.Keys

    }

    if ($Tpm) 

    {

        $TpmEventIDs = $script:AttestationTpmStatusEvents.Keys + $script:TcgLogValidationEventId

        $EventIds += $TpmEventIds

    }

    $AttestationEvents = @()

    switch ($PSCmdlet.ParameterSetName)

    {

        "LocalComputer" {

                            $AttestationEvents += Get-WinEvent -ProviderName $script:AttestationEventProviderName -ErrorAction Stop| Where-Object {($EventIds -contains $_.Id) -and ($_.TimeCreated -gt $StartTime) -and ($_.TimeCreated -le $EndTime)} 

                        }

        "RemoteComputer" {

                            $AttestationEvents += Get-WinEvent -ProviderName $script:AttestationEventProviderName -ComputerName $ComputerName -Credential $Credential -ErrorAction Stop| Where-Object {($EventIds -contains $_.Id) -and ($_.TimeCreated -gt $StartTime) -and ($_.TimeCreated -le $EndTime)} 

                        }

    }

    $AttestationRequests = @()

    if ($Tpm)

    {

        $TpmEvents = $AttestationEvents | Where-Object {$TpmEventIds -contains $_.Id}

        if ($PSCmdlet.ParameterSetName -eq "RemoteComputer")

        {

            $TpmBasedAttestationRequests = FindTpmRequests -Events $TpmEvents -ComputerName $ComputerName -Credential $Credential -ConfigurationName $EndpointName -UseRemote

        }

        else 

        {

            $TpmBasedAttestationRequests = FindTpmRequests -Events $TpmEvents    

        }

        $AttestationRequests += $TpmBasedAttestationRequests

    }

    if ($AD)

    {

        $AdEvents = $AttestationEvents | Where-Object {$script:AttestationAdStatusEvents.Keys -contains $_.Id}

        if ($PSCmdlet.ParameterSetName -eq "RemoteComputer")

        {

            $AdBasedAttestationRequests = FindADRequests -Events $AdEvents -ComputerName $ComputerName -Credential $Credential -ConfigurationName $EndpointName -UseRemote

        }

        else 

        {

            $AdBasedAttestationRequests = FindADRequests -Events $AdEvents    

        }

        $AttestationRequests += $AdBasedAttestationRequests

    }

    # Re-sort by time

    $AttestationRequests = $AttestationRequests | Sort-Object -Property Time -Descending

    Write-Output $AttestationRequests

}

<#

 Parse events into AD based attestation requests

#>

function FindADRequests

{

    param(

        [System.Array] 

        $Events, 

        [switch] 

        $UseRemote, 

        [string]

        $ComputerName, 

        [PSCredential]

        $Credential, 

        [String]

        $ConfigurationName

    )

    if ($UseRemote)

    {

        $AuthorizedADHostGroups = Invoke-Command -ComputerName $ComputerName -Credential $Credential -ConfigurationName $ConfigurationName -ScriptBlock {Get-HgsAttestationHostGroup -WarningAction Ignore -ErrorAction Stop} -ErrorAction Stop

    }

    else 

    {

        $AuthorizedADHostGroups = Get-HgsAttestationHostGroup -WarningAction Ignore

    }

    $ADAttestationEventGroups = GroupEvents $Events

    $AdBasedAttestationRequests = @()

    foreach ($ActivityId in $ADAttestationEventGroups.Keys)

    {

        $AttestationRequest = [AttestationReport]::new()

        $AttestationRequest.AttestationOperationMode = "AD"

        $AttestationRequest.EndorsementKeyHash = "NotApplicable"

        $EventList = $ADAttestationEventGroups[$ActivityId] | Sort-Object TimeCreated

        # Use time of earliest event 

        $AttestationRequest.Time = ($EventList)[0].TimeCreated

        foreach ($event in $EventList)

        {

            if ($AttestationAdStatusEvents.ContainsKey($event.Id))

            {

                $AttestationRequest.AttestationStatus = $script:AttestationAdStatusEvents[$event.Id]

                if ($AttestationRequest.AttestationStatus -eq "Passed")

                {

                    $AttestationRequest.AttestationSubStatus = "NoInformation"

                    $AttestationRequest.HostName = $event.Properties.Value

                    # Check if it can't be cast into a SID. If it can, then its the HostGroup Identifier.  Otherwise, it should be used as the Host Name

                    # Known issue with this approach: if the SAM account name is somehow in the form of a SID, but this should not be possible.

                    foreach ($prop in $Event.Properties)

                    {

                        try

                        {

                            $sid = New-Object System.Security.Principal.SecurityIdentifier -ArgumentList $prop.Value

                            $hostGroup = $AuthorizedADHostGroups | Where-Object {$_.Identifier -eq $sid.Value}

                            if ($hostGroup -ne $null) 

                            {

                                $AttestationRequest.AuthorizedHostGroup = $hostGroup.Name     

                            }

                            else 

                            {

                                $AttestationRequest.AuthorizedHostGroup = $sid.Value

                            }

                        }

                        catch

                        {

                            $AttestationRequest.HostName = $prop.Value

                        }

                    }

                }

                else

                {

                    # Otherwise, the only property associated with this event is the machine SID of the attesting client

                    $AttestationRequest.HostName = $event.Properties.Value

                    $AttestationRequest.AuthorizedHostGroup = "NotApplicable"

                }

                $AdBasedAttestationRequests += ,$AttestationRequest

            }

        }

    }

    return $AdBasedAttestationRequests

}

<#

 Parse events into TPM requests

#>

function FindTpmRequests

{

    param(

        [System.Array] $Events, 

        [switch] $UseRemote,

        [string] $ComputerName,

        [PSCredential] $Credential,

        [string] $ConfigurationName

        )

    if ($UseRemote)

    {

        # Only need to get settings from one node

        $AuthorizedTpmHosts = Invoke-Command -ComputerName $ComputerName -Credential $Credential -ConfigurationName $ConfigurationName -ScriptBlock {Get-HgsAttestationTpmHost -WarningAction Ignore -ErrorAction Stop} -ErrorAction Stop

    }

    else 

    {

        $AuthorizedTpmHosts = Get-HgsAttestationTpmHost -WarningAction Ignore -ErrorAction Stop

    }

    $TpmAttestationEventGroups = GroupEvents $Events

    $TpmBasedAttestationRequests = @()

    # Iterate through attestation groups, generating an AttestationReport object

    foreach ($ActivityId in $TpmAttestationEventGroups.Keys)

    {

        $AttestationRequest = [AttestationReport]::new()

        $AttestationRequest.AttestationOperationMode = "Tpm"

        $AttestationRequest.AuthorizedHostGroup = "NotApplicable"

        $tpmEventList = $TpmAttestationEventGroups[$ActivityId] | Sort-Object TimeCreated

        # Get earliest event

        $AttestationRequest.Time = ($tpmEventList)[0].TimeCreated

        $HostNameFound = $false

        foreach ($event in $tpmEventList)

        {

            # Not all attestation failure events have the host EK attached to it.  Instead, use the ID from the event corresponding to starting the TCG log verification

            if ($event.Id -eq $script:TcgLogValidationEventId -and -not $HostNameFound)

            {

                $AttestationRequest.EndorsementKeyHash = $Event.Properties.Value

                $Hostname = ($AuthorizedTpmHosts | Where-Object {$_.Identifier -eq $event.Properties.value}).Name

                if ($Hostname)

                {

                    $AttestationRequest.HostName = $HostName

                }

                $HostNameFound = $true

            }

            if($AttestationTpmStatusEvents.ContainsKey($Event.Id))

            {

                $AttestationRequest.AttestationStatus = $AttestationTpmStatusEvents[$event.Id]

                # Account for multiple substatus reasons

                if ($AttestationRequest.AttestationSubStatus -ne $AttestationTpmSubStatusEvents[$event.Id])

                {

                    $AttestationRequest.AttestationSubStatus += $AttestationTpmSubStatusEvents[$event.Id]

                }

                if (-not $HostNameFound -and $AttestationRequest.AttestationStatus -eq "UnauthorizedHost")

                {

                    $AttestationRequest.HostName = 'UnauthorizedHost'

                    $AttestationRequest.EndorsementKeyHash = $Event.Properties.Value

                    $HostNameFound = $true

                }

            }

        }

        $TpmBasedAttestationRequests += ,$AttestationRequest

    }

    return $TpmBasedAttestationRequests

}

# Group an array of events into a dictionary based on their Activity ID's.

function GroupEvents([System.Array] $Events)

{

    $EventGroups = [ordered] @{}

    # Form groups based on the correlation Activity ID (on the HGS server, these all properly map to identical attestation requests)

    foreach ($event in $Events)

    {

        if ($EventGroups.Contains($event.ActivityId))

        {

            $EventGroups[$event.ActivityId] += ($event)

        }

        else

        {

            $EventGroups.Add($event.ActivityId, @($event))

        }

    }

    return $EventGroups

}

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