AzSK.ADO

1.3.0

Framework/Helpers/ConfigurationHelper.ps1

                                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 $NotExtendedTypes = @{} #Used to remember Types we have checked already as to whether they are extended (e.g., Build.ext.ps1) or not.

    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) {

            $basePath = [ConfigurationHelper]::GetBaseFrameworkPath()

            $rootConfigPath = $basePath | Join-Path -ChildPath "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");

        } 

        #Check if policy is present in cache and fetch the same if present

        $cachedPolicyContent = [ConfigurationHelper]::PolicyCacheContent | Where-Object { $_.Name -eq $policyFileName }

        if ($cachedPolicyContent)

        {

            $fileContent = $cachedPolicyContent.Content

            if ($fileContent)

            {

                return $fileContent                                  

            }

        }

        <#

        if ($onlineStoreUri -match "\{0\}.*\{1\}" -and $useOnlinePolicyStore -eq $true)

        {

            #[EventBase]::PublishGenericCustomMessage(" Org Policy URL not set yet: $onlineStoreUri", [MessageType]::Warning);

        }

        #>

        if ($useOnlinePolicyStore) {

            if ([string]::IsNullOrWhiteSpace($onlineStoreUri)) {

                throw [System.ArgumentException] ("The argument 'onlineStoreUri' is null");

            } 

            #Remember if the file we are attempting is SCMD.json

            $bFetchingSCMD = ($policyFileName -eq [Constants]::ServerConfigMetadataFileName)

            if ($bFetchingSCMD -and $null -ne [ConfigurationHelper]::ServerConfigMetadata) {

                return [ConfigurationHelper]::ServerConfigMetadata;

            }

            #First load offline OSS Content

            $fileContent = [ConfigurationHelper]::LoadOfflineConfigFile($policyFileName)

            #Check if policy is listed as present in server config metadata file

            if (-not [ConfigurationHelper]::OfflineMode -and [ConfigurationHelper]::IsPolicyPresentOnServer($policyFileName, $useOnlinePolicyStore, $onlineStoreUri, $enableAADAuthForOnlinePolicyStore)) {

                #Write-Host -ForegroundColor Yellow "**NOT FOUND** $policyFileName"

                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)    

                    }

                    #Write-Host -ForegroundColor Green "**ADDING TO CACHE** $policyFileName"

                }

                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 ($bFetchingSCMD ) {

                            [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 we were trying to fetch SCMD and the returned JSON does not have 'OnlinePolicyList' something is wrong!

            #In ADO this happens if ADOScannerPolicy repo does not exist.

            #ADOTOD: Perhaps we should query for repo being present when the OnlinePolicyURL is formed (or first used)

            if ($bFetchingSCMD -and -not [Helpers]::CheckMember($fileContent, "OnlinePolicyList"))

            {

                #[EventBase]::PublishGenericCustomMessage([Constants]::OfflineModeWarning, [MessageType]::Warning);

                $fileContent = [ConfigurationHelper]::LoadOfflineConfigFile($policyFileName)

            }

            if (-not $fileContent) {

                #Fire special event to notify user about switching to offline policy  

                [EventBase]::PublishGenericCustomMessage(([Constants]::OfflineModeWarning + " Policy: $policyFileName"), [MessageType]::Warning);

                $fileContent = [ConfigurationHelper]::LoadOfflineConfigFile($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"                                  

        }

        #Store policy file content into cache. 

        #Note: This will happen only once per file (whether found on server or not). 

        #In case of SVT config JSONs, we will overwrite this (only once) right after resolving baselines/dynamic parameters in control recos, etc. (in LoadSVTConfig)

        #ADOTODO: by Sep2020. Do any controlSettings processing here. Revisit after Asim's policy cache changes are integrated.

        if ($policyFileName -match "ControlSettings.json")

        {    

            #Compile regex-s once upon load. The Env setting is just to compare perf during dev-test.

            #This code will overwrite the text regex with compiled version. (At point of usage, no change is needed.)

            if ((@($fileContent.Patterns)).Count -gt 0 -and -not $env:AzSKNoCompileRegex)

            {

                $iPat = 0

                $rgxOpt = [Text.RegularExpressions.RegexOptions]::Compiled; #default: case-sensitive match!

                $fileContent.Patterns | % {

                    $regExList = @($_.RegexList)

                    $iReg=0

                    $regExList | % {

                        $txtRegex = $_

                        $compiledRegex = [Text.RegularExpressions.Regex]::new($txtRegex, $rgxOpt)

                        $fileContent.Patterns[$iPat].RegexList[$iReg] = $compiledRegex

                        $iReg++

                    }

                    $iPat++

                }

            }

        }

        $policy = [Policy]@{

            Name    = $policyFileName

            Content = $fileContent

        }

        [ConfigurationHelper]::PolicyCacheContent += $policy

        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

        # We are adding this code in AzSK.Framework for time-being. Need to revisit our strategy to update this code in framework later. This is ADO specific.

        $rmContext = [ContextHelper]::GetCurrentContext();

        $user = "";

        $base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $user, $rmContext.AccessToken)))

        try {

            $FileName = $policyFileName;

            #$ResponseHeaders = $null #The '-ResponseHeadersVariable' param is supported in PS core, we should enable after moving to PS core. Will allow us to check response content-type etc.

            $uri = $global:ExecutionContext.InvokeCommand.ExpandString($onlineStoreUri)

            $webRequestResult = Invoke-RestMethod -Uri $uri -Method Get -ContentType "application/json" -Headers @{Authorization = ("Basic {0}" -f $base64AuthInfo) } #-ResponseHeadersVariable 'ResponseHeaders'

            return $webRequestResult;

        }

        catch {

            return $null;

        }

        return $null;

    }

    #Need to rethink on this function logic

    hidden static [PSObject] LoadModuleJsonFile([string] $fileName) {

     $basePath = [ConfigurationHelper]::GetBaseFrameworkPath()

     $rootConfigPath = Join-Path $basePath -ChildPath "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) {

     $basePath = [ConfigurationHelper]::GetBaseFrameworkPath()

     $rootConfigPath = Join-Path $basePath | Join-Path -ChildPath "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

        }

    }

    #Helper function to get base Framework folder path

    hidden static [PSObject] GetBaseFrameworkPath() {

        $moduleName = $([Constants]::AzSKModuleName)

        #Remove Staging from module name before forming config base path

        $moduleName = $moduleName -replace "Staging", ""

        #Irrespective of whether Dev-Test mode is on or off, base framework path will now remain same as the new source code repo doesn't have AzSK.Framework folder.

        $basePath = (Get-Item $PSScriptRoot).Parent.FullName    

        return $basePath

    }

}

#Model to store online policy file content with name. 

#Used in ConfigurationHelper to cache online policy files

class Policy {

    [string] $Name

    [PSObject] $Content

}

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