Sort the server directory and add the restore task installer
The README and Code of Conduct files move to server/resources, the scripts that build and deploy them to server/scripts. The new install_restore_task.ps1 installs a scheduled task as SYSTEM that puts the files back every 30 minutes, so the shell server's root user can neither stop it nor change the copies it restores from. Co-Authored-By: Claude Code <noreply@anthropic.com>
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Zebreus
parent
996cc53e56
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1 changed files with 128 additions and 3 deletions
101
server/scripts/install_restore_task.ps1
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101
server/scripts/install_restore_task.ps1
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# Installs the scheduled task that puts the shell server's README and Code of Conduct files back every 30
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# minutes. The task runs as SYSTEM, so the shell server's root user can neither stop it nor change the copies it
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# restores from.
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#
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# Run this in an elevated PowerShell on the server, with this script and the ../resources directory next to it:
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# powershell -ExecutionPolicy Bypass -File .\install_restore_task.ps1
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# Remove the task and the copies again with:
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# powershell -ExecutionPolicy Bypass -File .\install_restore_task.ps1 -Uninstall
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[CmdletBinding()]
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param(
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[string]$Target = 'C:\msys2\home\root',
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[switch]$Uninstall
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)
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$ErrorActionPreference = 'Stop'
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$installDir = 'C:\ProgramData\kik-restore'
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$taskName = 'KiK restore shell files'
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$files = 'README', 'README.en', 'CODE_OF_CONDUCT', 'CODE_OF_CONDUCT.en'
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# The copies the task restores from and the script it runs both live in $installDir, which only SYSTEM and the
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# administrators may read or write.
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$restoreScript = @'
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# Puts the shell server's README and Code of Conduct files back from the copies next to this script.
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# Runs as SYSTEM every 30 minutes; the shell server's root user can neither stop it nor change the copies.
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param([string]$Target = 'C:\msys2\home\root')
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$log = Join-Path $PSScriptRoot 'restore.log'
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foreach ($name in @('README', 'README.en', 'CODE_OF_CONDUCT', 'CODE_OF_CONDUCT.en')) {
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$path = Join-Path $Target $name
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try {
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if (Test-Path -LiteralPath $path) {
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# the root user may have replaced the file or locked everyone else out
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takeown /f $path /a | Out-Null
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icacls $path /reset | Out-Null
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if ((Get-Item -LiteralPath $path -Force).PSIsContainer) { Remove-Item -LiteralPath $path -Recurse -Force }
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}
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Copy-Item -LiteralPath (Join-Path $PSScriptRoot $name) -Destination $path -Force
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"$(Get-Date -Format s) restored $name" | Out-File -FilePath $log -Append
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} catch {
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"$(Get-Date -Format s) failed $name : $_" | Out-File -FilePath $log -Append
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}
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}
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'@
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if (-not ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
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throw 'Run this in an elevated PowerShell.'
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}
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if ($Uninstall) {
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Unregister-ScheduledTask -TaskName $taskName -Confirm:$false -ErrorAction SilentlyContinue
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if (Test-Path -LiteralPath $installDir) { Remove-Item -LiteralPath $installDir -Recurse -Force }
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Write-Host "Removed the task and $installDir."
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return
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}
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$resources = Join-Path $PSScriptRoot '..\resources'
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$missing = $files | Where-Object { -not (Test-Path -LiteralPath (Join-Path $resources $_)) }
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if ($missing) { throw "Missing files in $resources : $($missing -join ', ')" }
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# The root user may have prepared the directory or the file names, so nothing that looks like a link is used.
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$prepared = Get-Item -LiteralPath $installDir -Force -ErrorAction SilentlyContinue
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if ($prepared -and $prepared.Attributes -band [IO.FileAttributes]::ReparsePoint) { throw "$installDir is a link, refusing to install." }
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New-Item -ItemType Directory -Force -Path $installDir | Out-Null
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# Only SYSTEM and the administrators may read or write the copies and the script.
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$acl = New-Object System.Security.AccessControl.DirectorySecurity
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$acl.SetAccessRuleProtection($true, $false)
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foreach ($sid in 'S-1-5-18', 'S-1-5-32-544') {
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$acl.AddAccessRule((New-Object System.Security.AccessControl.FileSystemAccessRule -ArgumentList $sid, 'FullControl', 'ContainerInherit,ObjectInherit', 'None', 'Allow'))
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}
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$acl.SetOwner((New-Object System.Security.Principal.SecurityIdentifier 'S-1-5-32-544'))
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Set-Acl -LiteralPath $installDir -AclObject $acl
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# Files the root user prepared are removed, the copies are written fresh and inherit the restricted permissions.
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foreach ($name in $files + 'restore.ps1') {
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$path = Join-Path $installDir $name
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if (Test-Path -LiteralPath $path) {
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$item = Get-Item -LiteralPath $path -Force
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if ($item.Attributes -band [IO.FileAttributes]::ReparsePoint) { throw "$path is a link, refusing to install." }
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Remove-Item -LiteralPath $path -Recurse -Force
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}
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}
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Copy-Item -Path (Join-Path $resources '*') -Destination $installDir -Force
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[IO.File]::WriteAllText((Join-Path $installDir 'restore.ps1'), $restoreScript)
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$action = New-ScheduledTaskAction -Execute 'powershell.exe' -Argument "-NoProfile -NonInteractive -ExecutionPolicy Bypass -WindowStyle Hidden -File `"$installDir\restore.ps1`" -Target `"$Target`""
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$triggers = @(
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New-ScheduledTaskTrigger -Once -At (Get-Date) -RepetitionInterval (New-TimeSpan -Minutes 30) -RepetitionDuration (New-TimeSpan -Days 3650)
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New-ScheduledTaskTrigger -AtStartup
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)
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$settings = New-ScheduledTaskSettingsSet -StartWhenAvailable -MultipleInstances IgnoreNew -ExecutionTimeLimit (New-TimeSpan -Minutes 10) -RestartCount 3 -RestartInterval (New-TimeSpan -Minutes 5) -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries
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$principal = New-ScheduledTaskPrincipal -UserId 'SYSTEM' -LogonType ServiceAccount -RunLevel Highest
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Register-ScheduledTask -TaskName $taskName -Action $action -Trigger $triggers -Principal $principal -Settings $settings -Force | Out-Null
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Start-ScheduledTask -TaskName $taskName
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Start-Sleep -Seconds 5
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Write-Host "Task '$taskName' runs as SYSTEM every 30 minutes and at startup."
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Get-ScheduledTaskInfo -TaskName $taskName | Format-List LastRunTime, LastTaskResult, NextRunTime
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Get-Content (Join-Path $installDir 'restore.log') -Tail 4 -ErrorAction SilentlyContinue
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icacls $installDir
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