Framework/Helpers/IdentityHelpers.ps1

Set-StrictMode -Version Latest 

class IdentityHelpers
{
    static hidden [bool] $hasGraphAccess = $false
    static hidden [string] $graphAccessToken = $null
    static hidden [string] $ALTControlEvaluationMethod

    hidden static [bool] IsAltAccount($SignInName, $graphToken)
    {
        $isAltAccount = $false
        $headers = @{"Authorization"= ("Bearer " + $graphToken); "Content-Type"="application/json"}
        $uri=""
        $graphURI = [WebRequestHelper]::GetGraphUrl()

        if (-not [string]::IsNullOrWhiteSpace($SignInName))
        {
            $uri = [string]::Format('{0}/v1.0/users/{1}?$select=onPremisesExtensionAttributes', $graphURI, $SignInName)
        }
        else
        {
            return $false
        }


        try
        { 
            $responseObj = [WebRequestHelper]::InvokeGetWebRequest($uri, $headers);
            if ($null -ne $responseObj -and ($responseObj | Measure-Object).Count -gt 0)
            {
                # extensionAttribute contains 15 different values which define unique properties for users.
                $extensionAttributes = $responseObj.onPremisesExtensionAttributes
                #"extensionAttribute2" contains the integer values which represents the different types of users.
                #"extensionAttribute2: -10" => SC-ALT Accounts
                if($extensionAttributes.extensionAttribute2 -eq "-10")
                {
                    $isAltAccount = $true
                }
            }
        } 
        catch
        { 
            return $false;
        }
        return $isAltAccount
    }

    hidden static [bool] IsServiceAccount($SignInName, $subjectKind, $graphToken)
    {
        $isServiceAccount = $false
        $headers = @{"Authorization"= ("Bearer " + $graphToken); "Content-Type"="application/json"}
        $uri=""
        $graphURI = [WebRequestHelper]::GetGraphUrl()
        if($subjectKind -eq "User")
        {
            if (-not [string]::IsNullOrWhiteSpace($SignInName))
            {
                $uri = [string]::Format('{0}/v1.0/users/{1}?$select=onPremisesImmutableId,onPremisesExtensionAttributes', $graphURI, $SignInName)
            }
            else
            {
                return $false
            }
        }
        else
        {
            return $false
        }

        try
        { 
            $responseObj = [WebRequestHelper]::InvokeGetWebRequest($uri, $headers);
            if ($null -ne $responseObj -and ($responseObj | Measure-Object).Count -gt 0)
            {
                # extensionAttribute contains 15 different values which define unique properties for users.
                $extensionAttributes = $responseObj.onPremisesExtensionAttributes
                #"extensionAttribute2" contains the integer values which represents the different types of users.
                #"extensionAttribute2: -9" => Service Accounts
                if($extensionAttributes.extensionAttribute2 -eq "-9")
                {
                    $isServiceAccount = $true
                }
            }
        } 
        catch
        { 
            return $false;
        }
        return $isServiceAccount
    }


    hidden static [bool] IsADObjectGUID($immutableId){        
        try {
            $decodedII = [system.convert]::frombase64string($immutableId)
            $guid = [GUID]$decodedII    
        }
        catch {
            return $false
        }
        return $true
    }

    static CheckGraphAccess()
    {
        # In CA mode, we use azure context to fetch the graph access token, because VSTS authentication is not supported in CA.
        $useAzContext = $false
        $scanSource = [AzSKSettings]::GetInstance().GetScanSource();
        if ($scanSource -eq 'CICD') {
            [IdentityHelpers]::hasGraphAccess = $false
        }
        else
        {
            if ($scanSource -eq "CA") {
                $useAzContext = $true
            }
            $graphUri = [WebRequestHelper]::GetGraphUrl()
            $uri = $GraphUri + "/v1.0/users?`$top=1"
            [IdentityHelpers]::graphAccessToken = [ContextHelper]::GetGraphAccessToken($useAzContext)
            if (-not [string]::IsNullOrWhiteSpace([IdentityHelpers]::graphAccessToken))
            {
                $header = @{
                    "Authorization"= ("Bearer " + [IdentityHelpers]::graphAccessToken); 
                    "Content-Type"="application/json"
                };
                try
                {
                    $webResponse = [WebRequestHelper]::InvokeGetWebRequest($uri, $header);
                    [IdentityHelpers]::hasGraphAccess = $true;
                }
                catch
                {
                    [IdentityHelpers]::hasGraphAccess = $false;
                }
            }
        }
    }

    #This method differentiate human accounts and service account from the list.
    hidden static [PSObject] DistinguishHumanAndServiceAccount([PSObject] $allMembers, $orgName)
    {
        $humanAccount = @(); 
        $serviceAccount = @();
        $defaultSvcAcc = @(); #"Account Service ($orgName)" # This is default service account automatically added by ADO.
        $allMembers | ForEach-Object{
            if (-not [string]::IsNullOrEmpty($_.mailAddress)) 
            {
                $isServiceAccount = [IdentityHelpers]::IsServiceAccount($_.mailAddress, $_.subjectKind, [IdentityHelpers]::graphAccessToken)
                if ($isServiceAccount)
                {
                    $serviceAccount += $_
                }
                else
                {
                    $humanAccount += $_
                }
            }
            else {
                $defaultSvcAcc += $_
            }
        }
        if ($null -ne $defaultSvcAcc -and $defaultSvcAcc.Count -gt 0) {
            $serviceAccount += $defaultSvcAcc
        }
        $adminMembers = @{serviceAccount = $serviceAccount; humanAccount = $humanAccount;};
        return $adminMembers
    }

    #This method differentiate alt accounts and non-alt account from the list.
    hidden static [PSObject] DistinguishAltAndNonAltAccount([PSObject] $allMembers)
    {
        $altAccount = @(); 
        $nonAltAccount = @();
        $allMembers | ForEach-Object{
            $isAltAccount = [IdentityHelpers]::IsAltAccount($_.mailAddress, [IdentityHelpers]::graphAccessToken)
            if ($isAltAccount)
            {
                $altAccount += $_
            }
            else
            {
                $nonAltAccount += $_
            }
        }
        $adminMembers = @{altAccount = $altAccount; nonAltAccount = $nonAltAccount;};
        return $adminMembers
    }
}

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