Framework/Helpers/ConfigurationHelper.ps1

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Set-StrictMode -Version Latest
#
# ConfigurationHelper.ps1
#
class ConfigurationHelper {
    hidden static [bool] $IsIssueLogged = $false
    hidden static [PSObject] $ServerConfigMetadata = $null
    hidden static [bool] $OfflineMode = $false;
    hidden static [string] $ConfigVersion =""
    hidden static [bool] $LocalPolicyEnabled= $false
    hidden static [string] $ConfigPath = [string]::Empty
    hidden static [Policy[]] $PolicyCacheContent = @()
    hidden static [PSObject] LoadOfflineConfigFile([string] $fileName)
    {
        return [ConfigurationHelper]::LoadOfflineConfigFile($fileName, $true);
    }
    hidden static [PSObject] LoadOfflineConfigFile([string] $fileName, [bool] $parseJson) {
        $rootConfigPath = [Constants]::AzSKAppFolderPath  ;
        return [ConfigurationHelper]::LoadOfflineConfigFile($fileName, $true,$rootConfigPath);
    }
    hidden static [PSObject] LoadOfflineConfigFile([string] $fileName, [bool] $parseJson, $path) {
        #Load file from AzSK App folder
        $rootConfigPath = $path ;    
        
        $extension = [System.IO.Path]::GetExtension($fileName);

        $filePath = $null
        if(Test-Path -Path $rootConfigPath)
        {
            $filePath = (Get-ChildItem $rootConfigPath -Name -Recurse -Include $fileName) | Select-Object -First 1 
        }
        #If file not present in App folder load settings from Configurations in Module folder
        if (!$filePath) {
            $rootConfigPath = Join-Path (Get-Item $PSScriptRoot).Parent.FullName  "Configurations"
            
            $filePath = (Get-ChildItem $rootConfigPath -Name -Recurse -Include $fileName) | Select-Object -First 1 
        }

        if ($filePath)
        {
            if($parseJson)
            {
                if($extension -eq ".json" -or $extension -eq ".lawsview")
                {
                    $fileContent = (Get-Content -Raw -Path (Join-Path $rootConfigPath $filePath)) | ConvertFrom-Json
                }
                else
                {
                    $fileContent = (Get-Content -Raw -Path (Join-Path $rootConfigPath $filePath)) 
                }
            }
            else
            {
                $fileContent = (Get-Content -Raw -Path (Join-Path $rootConfigPath $filePath)) 
            }
        }
        else {
            throw "Unable to find the specified file '$fileName'"          
        }
        if (-not $fileContent) {
            throw "The specified file '$fileName' is empty"                                  
        }

        return $fileContent;
    }    

    hidden static [PSObject] LoadServerConfigFile([string] $policyFileName, [bool] $useOnlinePolicyStore, [string] $onlineStoreUri, [bool] $enableAADAuthForOnlinePolicyStore) {
        [PSObject] $fileContent = "";
        if ([string]::IsNullOrWhiteSpace($policyFileName)) {
            throw [System.ArgumentException] ("The argument 'policyFileName' is null");
        } 

        if ($useOnlinePolicyStore) {
            
            if ([string]::IsNullOrWhiteSpace($onlineStoreUri)) 
            {
                throw [System.ArgumentException] ("The argument 'onlineStoreUri' is null");
            } 
            
            if($policyFileName -eq [Constants]::ServerConfigMetadataFileName -and $null -ne [ConfigurationHelper]::ServerConfigMetadata)
            {
                return [ConfigurationHelper]::ServerConfigMetadata;
            }
            #First load offline OSS Content
            $fileContent = [ConfigurationHelper]::LoadOfflineConfigFile($policyFileName)

            #Check if policy present in server using metadata file
            if(-not [ConfigurationHelper]::OfflineMode -and [ConfigurationHelper]::IsPolicyPresentOnServer($policyFileName,$useOnlinePolicyStore,$onlineStoreUri,$enableAADAuthForOnlinePolicyStore))
            {
                #Check if online policy is present in configuration cache and fetch same
                $cachedPolicyContent = [ConfigurationHelper]::PolicyCacheContent | Where-Object { $_.Name -eq $policyFileName }
                if($cachedPolicyContent)
                {
                    $fileContent = $cachedPolicyContent.Content
                }
                #If policy file content is not present in cache then load it from server
                else {
                    try 
                    {
                        if([String]::IsNullOrWhiteSpace([ConfigurationHelper]::ConfigVersion) -and -not [ConfigurationHelper]::LocalPolicyEnabled)
                        {
                            try
                            {
                                $Version = [System.Version] ($global:ExecutionContext.SessionState.Module.Version);
                                $serverFileContent = [ConfigurationHelper]::InvokeControlsAPI($onlineStoreUri, $Version, $policyFileName, $enableAADAuthForOnlinePolicyStore);
                                [ConfigurationHelper]::ConfigVersion = $Version;
                            }
                            catch
                            {
                                try{
                                    $Version = ([ConfigurationHelper]::LoadOfflineConfigFile("AzSK.json")).ConfigSchemaBaseVersion;
                                    $serverFileContent = [ConfigurationHelper]::InvokeControlsAPI($onlineStoreUri, $Version, $policyFileName, $enableAADAuthForOnlinePolicyStore);
                                    [ConfigurationHelper]::ConfigVersion = $Version;
                                }
                                catch{
                                    if(Test-Path $onlineStoreUri)
                                    {    
                                        [EventBase]::PublishGenericCustomMessage("Running Org-Policy from local policy store location: [$onlineStoreUri]", [MessageType]::Warning);
                                        $serverFileContent = [ConfigurationHelper]::LoadOfflineConfigFile($policyFileName, $true, $onlineStoreUri)
                                        [ConfigurationHelper]::LocalPolicyEnabled = $true
                                    }
                                    else {
                                        throw $_
                                    }
                                }
                            }
                        }
                        elseif([ConfigurationHelper]::LocalPolicyEnabled)
                        {
                            $serverFileContent = [ConfigurationHelper]::LoadOfflineConfigFile($policyFileName, $true, $onlineStoreUri)
                        }
                        else
                        {
                            $Version = [ConfigurationHelper]::ConfigVersion ;
                            $serverFileContent = [ConfigurationHelper]::InvokeControlsAPI($onlineStoreUri, $Version, $policyFileName, $enableAADAuthForOnlinePolicyStore);
                        }
    
                        #Completely override offline config if Server Override flag is enabled
                        if([ConfigurationHelper]::IsOverrideOfflineEnabled($policyFileName))
                        {
                            $fileContent = $serverFileContent
                        }
                        else
                        {
                            $fileContent = [Helpers]::MergeObjects($fileContent,$serverFileContent)    
                        }

                        #Store policy file content into cache
                        $policy = [Policy]@{
                            Name = $policyFileName
                            Content = $fileContent
                        }
                        [ConfigurationHelper]::PolicyCacheContent += $policy
                        
                    }
                    catch 
                    {
                        [ConfigurationHelper]::OfflineMode = $true;
    
                        if(-not [ConfigurationHelper]::IsIssueLogged)
                        {
                            if([Helpers]::CheckMember($_,"Exception.Response.StatusCode") -and  $_.Exception.Response.StatusCode.ToString().ToLower() -eq "unauthorized")
                            {
                                [EventBase]::PublishGenericCustomMessage(("Not able to fetch org-specific policy. The current Azure subscription is not linked to your org tenant."), [MessageType]::Warning);
                                [ConfigurationHelper]::IsIssueLogged = $true
                            }
                            elseif($policyFileName -eq [Constants]::ServerConfigMetadataFileName)
                            {
                                [EventBase]::PublishGenericCustomMessage(("Not able to fetch org-specific policy. Validate if org policy URL is correct."), [MessageType]::Warning);
                                [ConfigurationHelper]::IsIssueLogged = $true
                            }
                            else
                            {
                                [EventBase]::PublishGenericCustomMessage(("Error while fetching the policy [$policyFileName] from online store. " + [Constants]::OfflineModeWarning), [MessageType]::Warning);
                                [EventBase]::PublishGenericException($_);
                                [ConfigurationHelper]::IsIssueLogged = $true
                            }
                        }            
                    }                    
                }

            }

            if (-not $fileContent) {
                #Fire special event to notify user about switching to offline policy
                $fileContent = [ConfigurationHelper]::LoadOfflineConfigFile($policyFileName)
            }
            # return $updateResult
        }
        else {
            [EventBase]::PublishGenericCustomMessage(([Constants]::OfflineModeWarning + " Policy: $policyFileName"), [MessageType]::Warning);
            $fileContent = [ConfigurationHelper]::LoadOfflineConfigFile($policyFileName)
        }        

        if (-not $fileContent) {
            throw "The specified file '$policyFileName' is empty"                                  
        }

        return $fileContent;
    }

    hidden static [PSObject] LoadServerFileRaw([string] $fileName, [bool] $useOnlinePolicyStore, [string] $onlineStoreUri, [bool] $enableAADAuthForOnlinePolicyStore)
    {
        [PSObject] $fileContent = "";
        if ([string]::IsNullOrWhiteSpace($fileName)) {
            throw [System.ArgumentException] ("The argument 'fileName' is null");
        } 

        if ($useOnlinePolicyStore) {
            
            if ([string]::IsNullOrWhiteSpace($onlineStoreUri)) 
            {
                throw [System.ArgumentException] ("The argument 'onlineStoreUri' is null");
            } 

            #Check if policy present in server using metadata file
            if(-not [ConfigurationHelper]::OfflineMode -and [ConfigurationHelper]::IsPolicyPresentOnServer($fileName,$useOnlinePolicyStore,$onlineStoreUri,$enableAADAuthForOnlinePolicyStore))
            {
                try 
                {
                    if([String]::IsNullOrWhiteSpace([ConfigurationHelper]::ConfigVersion))
                    {                            
                        try
                        {
                            $Version = [System.Version] ($global:ExecutionContext.SessionState.Module.Version);
                            $serverFileContent = [ConfigurationHelper]::InvokeControlsAPI($onlineStoreUri, $Version, $fileName, $enableAADAuthForOnlinePolicyStore);
                            [ConfigurationHelper]::ConfigVersion = $Version;
                        }
                        catch
                        {
                            $Version = ([ConfigurationHelper]::LoadOfflineConfigFile("AzSK.json")).ConfigSchemaBaseVersion;
                            $serverFileContent = [ConfigurationHelper]::InvokeControlsAPI($onlineStoreUri, $Version, $fileName, $enableAADAuthForOnlinePolicyStore);
                            [ConfigurationHelper]::ConfigVersion = $Version;
                        }
                    }
                    else
                    {
                        $Version = [ConfigurationHelper]::ConfigVersion ;
                        $serverFileContent = [ConfigurationHelper]::InvokeControlsAPI($onlineStoreUri, $Version, $fileName, $enableAADAuthForOnlinePolicyStore);
                    }
                        
                    $fileContent = $serverFileContent
                }
                catch 
                {
                    [ConfigurationHelper]::OfflineMode = $true;

                    if(-not [ConfigurationHelper]::IsIssueLogged)
                    {
                        if([Helpers]::CheckMember($_,"Exception.Response.StatusCode") -and  $_.Exception.Response.StatusCode.ToString().ToLower() -eq "unauthorized")
                        {
                            [EventBase]::PublishGenericCustomMessage(("Not able to fetch org-specific policy. The current Azure subscription is not linked to your org tenant."), [MessageType]::Warning);
                            [ConfigurationHelper]::IsIssueLogged = $true
                        }
                        elseif($fileName -eq [Constants]::ServerConfigMetadataFileName)
                        {
                            [EventBase]::PublishGenericCustomMessage(("Not able to fetch org-specific policy. Validate if org policy URL is correct."), [MessageType]::Warning);
                            [ConfigurationHelper]::IsIssueLogged = $true
                        }
                        else
                        {
                            [EventBase]::PublishGenericCustomMessage(("Error while fetching the policy [$fileName] from online store. " + [Constants]::OfflineModeWarning), [MessageType]::Warning);
                            [EventBase]::PublishGenericException($_);
                            [ConfigurationHelper]::IsIssueLogged = $true
                        }
                    }            
                }
                
                
            }

        }
        else {
            [EventBase]::PublishGenericCustomMessage(([Constants]::OfflineModeWarning + " Policy: $fileName"), [MessageType]::Warning);            
        }        

        return $fileContent;
    }

    hidden static [PSObject] InvokeControlsAPI([string] $onlineStoreUri,[string] $configVersion, [string] $policyFileName, [bool] $enableAADAuthForOnlinePolicyStore)
    {
        #Evaluate all code block in onlineStoreUri.
        #Can use '$FileName' in uri to fill dynamic file name.
        #Revisit
        $FileName = $policyFileName;
        $Version = $configVersion;
        $uri = $global:ExecutionContext.InvokeCommand.ExpandString($onlineStoreUri)
        [System.Uri] $validatedUri = $null;
        $ResourceAppIdURI = "https://management.core.windows.net/"
        if([System.Uri]::TryCreate($uri, [System.UriKind]::Absolute, [ref] $validatedUri))
        {
            if($enableAADAuthForOnlinePolicyStore)
            {        
            $rmContext = [Helpers]::GetCurrentRMContext();
            if(-not [string]::IsNullOrWhiteSpace($rmContext.Environment.Name) -and $rmContext.Environment.Name -ne [Constants]::DefaultAzureEnvironment)
             {
                   $ResourceAppIdURI = $rmContext.Environment.ServiceManagementUrl
             }
             else {
                $ResourceAppIdURI = "https://management.core.windows.net/"
             }
                $accessToken = [Helpers]::GetAccessToken($ResourceAppIdURI)
                $serverFileContent = Invoke-RestMethod `
                                    -Method GET `
                                    -Uri $validatedUri `
                                    -Headers @{"Authorization" = "Bearer $accessToken"} `
                                    -UseBasicParsing
                return $serverFileContent
            }
            else 
            {
                $serverFileContent = Invoke-RestMethod `
                                    -Method GET `
                                    -Uri $validatedUri `
                                    -UseBasicParsing
                return $serverFileContent
            }
        }
        else
        {
            [EventBase]::PublishGenericCustomMessage(("'UseOnlinePolicyStore' is enabled but the 'OnlinePolicyStoreUrl' is not valid Uri: [$uri]. `r`n" + [Constants]::OfflineModeWarning), [MessageType]::Warning);
            [ConfigurationHelper]::OfflineMode = $true;
        }
        return $null;
    }

    #Need to rethink on this function logic
    hidden static [PSObject] LoadModuleJsonFile([string] $fileName) {
    
     $rootConfigPath = Join-Path (Get-Item $PSScriptRoot).Parent.FullName  "Configurations"
     $filePath = (Get-ChildItem $rootConfigPath -Name -Recurse -Include $fileName) | Select-Object -First 1 
     if ($filePath) {
            $fileContent = (Get-Content -Raw -Path (Join-Path $rootConfigPath $filePath)) | ConvertFrom-Json
        }
        else {
            throw "Unable to find the specified file '$fileName'"          
        }
    return $fileContent;
    }

    hidden static [PSObject] LoadModuleRawFile([string] $fileName) {
    
     $rootConfigPath = Join-Path (Get-Item $PSScriptRoot).Parent.FullName "Configurations";
     $filePath = (Get-ChildItem $rootConfigPath -Name -Recurse -Include $fileName) | Select-Object -First 1 
     if ($filePath) {
            $fileContent = (Get-Content -Raw -Path (Join-Path $rootConfigPath $filePath)) 
        }
        else {
            throw "Unable to find the specified file '$fileName'"          
        }
    return $fileContent;
    }

    hidden static [bool] IsPolicyPresentOnServer([string] $fileName, [bool] $useOnlinePolicyStore, [string] $onlineStoreUri, [bool] $enableAADAuthForOnlinePolicyStore)
    {
        #Check if Config meta data is null and load the meta data from server
        if($null -eq [ConfigurationHelper]::ServerConfigMetadata)
        {
            #if File is meta data file then return true
            if($fileName -eq [Constants]::ServerConfigMetadataFileName)
            {
                return $true
            }
            else
            {                
                $filecontent = [ConfigurationHelper]::LoadServerConfigFile([Constants]::ServerConfigMetadataFileName, $useOnlinePolicyStore, $onlineStoreUri, $enableAADAuthForOnlinePolicyStore);                            
                [ConfigurationHelper]::ServerConfigMetadata = $filecontent;
            }
        }
        
        if($null -ne [ConfigurationHelper]::ServerConfigMetadata)
        {
            if([ConfigurationHelper]::ServerConfigMetadata.OnlinePolicyList | Where-Object { $_.Name -eq $fileName})
            {
                return $true
            }
            else
            {
                return $false
            }
        }
        else
        {
            #If Metadata file is not present on server then set offline default meta data..
            [ConfigurationHelper]::ServerConfigMetadata = [ConfigurationHelper]::LoadOfflineConfigFile([Constants]::ServerConfigMetadataFileName);
            return $false            
        }
    }

    #Function to check if Override Offline flag is enabled
    hidden static [bool] IsOverrideOfflineEnabled([string] $fileName)
    {
        if($fileName -eq [Constants]::ServerConfigMetadataFileName)
        {
            return $true
        }

        $PolicyMetadata = [ConfigurationHelper]::ServerConfigMetadata.OnlinePolicyList | Where-Object { $_.Name -eq $fileName}
        if(($PolicyMetadata -and [Helpers]::CheckMember($PolicyMetadata,"OverrideOffline") -and $PolicyMetadata.OverrideOffline -eq $true) )
        {
            return $true
        }
        else
        {
            return $false
        }
    }
    
}

#Model to store online policy file content with name.
#Used in ConfigurationHelper to cache online policy files
class Policy{
    [string] $Name
    [PSObject] $Content
}