#***************************************************************************************************************
# This script modifies Global.asax.cs files
# It does the following:
#   *   Adds or removes TLS 1.2 enforcment in method Application_Start
#   *   A log with a transcript of all actions taken is generated
#***************************************************************************************************************

#************************************************ SCRIPT USAGE  ************************************************
# .\Update-GlobalAsaxCsToTls12.ps1
#   -log                        :   path and name of the log file
#   -packagesLocalDirectoryPath :   path to the packages local directory
#   -EnforceTls12               :   $true/$false, default($false), use $true to explicitly enforce TLS 1.2
#***************************************************************************************************************

PARAM (
    [Parameter(Mandatory = $false, HelpMessage = "The path to the directory in which to write log files.")]
    [string]$LogDir,
    [Parameter(Mandatory = $false, HelpMessage = "Indicate that this is being run on a staging environment.")]
    [switch]$useStaging = $false,
    [Parameter(Mandatory = $false, HelpMessage = "Indicates whether or not to enforce TLS 1.2")]
    [bool]$EnforceTls12 = $true
)

# Module import
Import-Module WebAdministration
Import-Module "$PSScriptRoot\CommonRollbackUtilities.psm1" -DisableNameChecking
Import-Module "$PSScriptRoot\AosEnvironmentUtilities.psm1" -Force -DisableNameChecking

#
# Determines if the file contains TLS 1.2 enforcement
#
function IsTls12EnforcementInFile
{
    param(
        [Parameter()]
        [ValidateNotNullOrEmpty()]
        [string]$filePath
    )

    $pattern = "^(.*?(\bSecurityProtocolType\.Tls12\b)[^$]*)$"

    if (Test-Path $filePath)
    {
        # get the file contents
        $contents = Get-Content -Path $filePath

        # loop through the lines in the file
        foreach ($line in $contents)
        {
            if ($line -match $pattern)
            {
                Write-Log "Tls 1.2 is enforced in file: $($filePath)"
                
                return $true
            }
        }
    }

    Write-Log "Tls 1.2 is NOT enforced in file: $($filePath)"

    return $false
}

#
# Gets the paths to the Global.asax.cs files that are to be inspected
#
function GetFilePathsToGlobalAsaxCs
{
    $paths = $null

    Write-Log "GetFilePathsToGlobalAsaxCs : useStaging : $($useStaging)"

    if ($useStaging)
    {
        # Work from the Staging root
        $webroot = Join-Path -Path $AosServiceStagingPath -ChildPath "webroot"
    }
    else 
    {
        # Work from webroot
        $webroot = Get-AosWebSitePhysicalPath
    }

    if (![string]::IsNullOrEmpty($webroot))
    {
        $paths = "$($webroot)\App_Code\Global.asax.cs","$($webroot)\bin\App_Code\Global.asax.cs"
    }

    Write-Log "GetFilePathsToGlobalAsaxCs returning: $($serviceDrive)"

    return $paths
}


#
# Adds or removes TLS 1.2 enforcment from the Global.asax.cs files
#
function EnforceTls12InGlobalAsaxCsFiles
{
    param(
        [Parameter()]
        [bool]$enforce
    )

    # default to false
    $isUpdated = $false

    # get the file paths
    $paths = GetFilePathsToGlobalAsaxCs

    if ($null -eq $paths)
    {
        Write-Log "Unable to determine Global.asax.cs file paths"
        return $isUpdaed
    }

    # loop through the paths
    foreach ($path in $paths)
    {
        if (Test-Path -Path $path)
        {
            $result = EnforceTls12InGlobalAsaxCs -filePath $path -enforce $enforce
            $isUpdated = $isUpdated -or $result
        }
    }
    
    return $isUpdated
}

#
# Adds or removes TLS 1.2 enforcment from the Global.asax.cs file provided
#
function EnforceTls12InGlobalAsaxCs
{
    param(
        [Parameter()]
        [ValidateNotNullOrEmpty()]
        [string]$filePath,
        [Parameter()]
        [bool]$enforce
    )

    # assume no changes
    $isUpdated = $false

    if (!(Test-Path -Path $filePath))
    {
        Write-Log "EnforceTls12InGlobalAsaxCs - File not found: $($filePath)"
        return $isUpdated
    }

    # set to false to begin with
    $doUpdateFile = $false

    # is the TLS 1.2 setting already in the file?
    $isTls12Enforced = IsTls12EnforcementInFile -filePath $filePath

    if ($enforce)
    {
        if ($isTls12Enforced)
        {
            # Nothing to do, so return
            return $isUpdated
        }

        #
        # ADD TLS 1.2 enforcment to the file
        #

        # get the file contents
        $contents = Get-Content -Path $filePath

        # search for the Application_Start method
        $pattern = "^(.*?(\bApplication_Start\b)[^$]*)$"

        $found = $false
        $lineCount = 0

        [String[]] $updatedContents = @()
        foreach ($Line in $contents)
        {
            $updatedContents += $Line

            if ($true -eq $found)
            {
                $lineCount += 1
            
                if (1 -eq $lineCount)
                {
                    # the file will need to be updated
                    $doUpdateFile = $true

                    # Add line to enforce TLS 1.2
                    $updatedContents += '            System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;'

                    # reset found
                    $found = $false
                    $line = 0

                    Write-Log "Added line: System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;"
                }
            }

            if ($Line -match $pattern)
            {
                $found = $true

                Write-Log "Search pattern match found"
            }
        }
    }
    else # $enforce == $false
    {
        if (!$isTls12Enforced)
        {
            # Nothing to do, so return
            return $isUpdated
        }
        
        #
        # REMOVE TLS 1.2 enforcment from the file
        #

        # get the file contents
        $contents = Get-Content -Path $filePath

        # search for SecurityProtocolType.Tls12
        $pattern = "^(.*?(\bSecurityProtocolType\.Tls12\b)[^$]*)$"

        [String[]] $updatedContents = @()
        foreach ($Line in $contents)
        {
            if ($Line -match $pattern)
            {
                $doUpdateFile = $true

                # Log that the line is found and being removed
                Write-Log "Removing line: System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;"
            }
            else 
            {
                # include the line
                $updatedContents += $Line
            }
        }
    }
    
    if ($doUpdateFile)
    {
        # construct the backup file name
        $backupFile = "$($filePath).$(get-date -f yyyyMMdd-HHmmss)"

        # create a backup
        Copy-Item $filePath $backupFile -Force

        Write-Log "Created backup file: $($backupFile)"

        Try
        {
            # update the file contents
            Set-Content $filePath $updatedContents

            # set return value
            $isUpdated = $true

            Write-Log "File updated: $($filePath)"
        }
        Catch
        {
            Write-Exception $_
            Write-Log "Unable to update file: $($filePath)" 
        }      
    }

    return $isUpdated
}

#***************************** END FUNCTIONS **********************************

#***************************** BEGIN EXECUTION ********************************

# Import the AosCommon module and initialize the log
Import-Module "$PSScriptRoot\AosCommon.psm1" -Force -DisableNameChecking

if (!$LogDir)
{
    $LogDir = $PSScriptRoot
}

$dt = [System.DateTime]::Now.ToString("yyyyMMddHHmmss")
$logFile = Join-Path -Path $LogDir -ChildPath "Update-GlobalAsaxCsToTls12.$dt.log"

Initialize-Log $logFile

try
{
	$error.Clear()

    # Start writing to the logs
    Write-Log "========== Begin execution of Update-GlobalAsaxToTls12.ps1 =========="

    # Update Global.asax.cs files if necessary
    EnforceTls12InGlobalAsaxCsFiles -enforce $EnforceTls12

    Write-Log "=============== End of logging for a script execution ==============="
}
catch
{
	# write the exception and that this process failed. Do not throw as this should not 
	# cause the deployment or update to fail.
    Write-Exception $_       
    Write-Log "Checking '$($ModulesNames -join ', ')' assemblies versions failed, see $log for details."
}
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