469 lines
16 KiB
PowerShell
469 lines
16 KiB
PowerShell
#Requires -Version 5.1
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<#
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.SYNOPSIS
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SMTPGraphRelay - einfacher SMTP Store-and-Forward Relay zu Microsoft Graph.
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.DESCRIPTION
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Nimmt lokale SMTP-Mails an, speichert sie als .eml in einer Queue und sendet sie
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anschließend per Microsoft Graph sendMail mit App-only Zertifikatsauthentifizierung.
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V1: EHLO/HELO, MAIL FROM, RCPT TO, DATA, RSET, NOOP, QUIT
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#>
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[CmdletBinding()]
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param(
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[string]$ConfigPath = "$PSScriptRoot\config.json"
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)
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$ErrorActionPreference = "Stop"
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[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
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function Write-Log {
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param(
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[Parameter(Mandatory)][string]$Message,
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[ValidateSet("INFO","WARN","ERROR","DEBUG")][string]$Level = "INFO"
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)
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$ts = Get-Date -Format "yyyy-MM-dd HH:mm:ss.fff"
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$line = "[$ts] [$Level] $Message"
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Write-Host $line
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try {
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if ($script:Config -and $script:Config.Paths.Logs) {
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$logDir = $script:Config.Paths.Logs
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if (-not [IO.Path]::IsPathRooted($logDir)) { $logDir = Join-Path $PSScriptRoot $logDir }
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New-Item -ItemType Directory -Path $logDir -Force | Out-Null
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Add-Content -LiteralPath (Join-Path $logDir "SMTPGraphRelay.log") -Value $line -Encoding UTF8
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}
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} catch {}
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}
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function Resolve-PathFromConfig {
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param([Parameter(Mandatory)][string]$Path)
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if ([IO.Path]::IsPathRooted($Path)) { return $Path }
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return (Join-Path $PSScriptRoot $Path)
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}
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function Test-IPv4InCidr {
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param(
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[Parameter(Mandatory)][System.Net.IPAddress]$Address,
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[Parameter(Mandatory)][string]$Cidr
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)
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if ($Address.AddressFamily -ne [System.Net.Sockets.AddressFamily]::InterNetwork) {
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return $false
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}
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if ($Cidr -notmatch '^(.+)/(\d{1,2})$') { return $false }
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try {
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$network = [System.Net.IPAddress]::Parse($matches[1])
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} catch {
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return $false
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}
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if ($network.AddressFamily -ne [System.Net.Sockets.AddressFamily]::InterNetwork) {
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return $false
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}
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$prefix = [int]$matches[2]
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if ($prefix -lt 0 -or $prefix -gt 32) { return $false }
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$ipBytes = $Address.GetAddressBytes()
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$netBytes = $network.GetAddressBytes()
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for ($i = 0; $i -lt 4; $i++) {
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$remaining = $prefix - ($i * 8)
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if ($remaining -le 0) { break }
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$bits = [Math]::Min(8, $remaining)
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[byte]$mask = (0xFF -shl (8 - $bits)) -band 0xFF
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if (($ipBytes[$i] -band $mask) -ne ($netBytes[$i] -band $mask)) {
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return $false
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}
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}
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return $true
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}
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function Test-ClientAllowed {
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param([Parameter(Mandatory)][System.Net.IPAddress]$Address)
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foreach ($entry in @($script:Config.Smtp.AllowedNetworks)) {
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if ($entry -eq "*") { return $true }
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try {
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if ($entry -match '/') {
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if (Test-IPv4InCidr -Address $Address -Cidr $entry) { return $true }
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} elseif ([System.Net.IPAddress]::Parse($entry).Equals($Address)) {
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return $true
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}
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} catch {}
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}
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return $false
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}
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function Get-GraphConnection {
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if (-not (Get-Module -ListAvailable -Name Microsoft.Graph.Authentication)) {
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throw "Microsoft.Graph.Authentication ist nicht installiert."
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}
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Import-Module Microsoft.Graph.Authentication -ErrorAction Stop
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$cert = Get-Item -LiteralPath ("Cert:\LocalMachine\My\{0}" -f $script:Config.Graph.CertificateThumbprint) -ErrorAction Stop
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$ctx = Get-MgContext
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$needsConnect = $true
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if ($ctx) {
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if ($ctx.ClientId -eq $script:Config.Graph.ClientId -and $ctx.TenantId -eq $script:Config.Graph.TenantId -and $ctx.AuthType -eq "AppOnly") {
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$needsConnect = $false
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}
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}
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if ($needsConnect) {
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Disconnect-MgGraph -ErrorAction SilentlyContinue | Out-Null
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Connect-MgGraph `
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-TenantId $script:Config.Graph.TenantId `
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-ClientId $script:Config.Graph.ClientId `
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-Certificate $cert `
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-NoWelcome | Out-Null
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}
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}
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function Set-MimeSender {
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param(
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[Parameter(Mandatory)][byte[]]$MimeBytes,
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[Parameter(Mandatory)][string]$Sender
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)
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# Headerbereich als Latin1 lesen, damit Bytes 1:1 erhalten bleiben.
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$latin1 = [System.Text.Encoding]::GetEncoding(28591)
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$text = $latin1.GetString($MimeBytes)
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$separator = "`r`n`r`n"
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$idx = $text.IndexOf($separator)
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if ($idx -lt 0) {
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$separator = "`n`n"
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$idx = $text.IndexOf($separator)
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}
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if ($idx -lt 0) { return $MimeBytes }
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$headers = $text.Substring(0, $idx)
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$body = $text.Substring($idx + $separator.Length)
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if ($headers -match '(?im)^From:.*(?:\r?\n[ \t].*)*') {
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$headers = [regex]::Replace(
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$headers,
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'(?im)^From:.*(?:\r?\n[ \t].*)*',
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"From: <$Sender>",
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1
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)
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} else {
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$headers = "From: <$Sender>`r`n" + $headers
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}
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return $latin1.GetBytes($headers + "`r`n`r`n" + $body)
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}
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function Send-QueuedMail {
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param([Parameter(Mandatory)][string]$FilePath)
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$metaPath = "$FilePath.json"
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$meta = $null
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if (Test-Path -LiteralPath $metaPath) {
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$meta = Get-Content -LiteralPath $metaPath -Raw -Encoding UTF8 | ConvertFrom-Json
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}
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$bytes = [IO.File]::ReadAllBytes($FilePath)
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if ($script:Config.Graph.ForceSender) {
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$bytes = Set-MimeSender -MimeBytes $bytes -Sender $script:Config.Graph.SenderMailbox
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}
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Get-GraphConnection
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$sender = [Uri]::EscapeDataString($script:Config.Graph.SenderMailbox)
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$uri = "https://graph.microsoft.com/v1.0/users/$sender/sendMail"
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$base64 = [Convert]::ToBase64String($bytes)
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try {
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Invoke-MgGraphRequest `
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-Method POST `
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-Uri $uri `
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-Body $base64 `
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-ContentType "text/plain" `
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-OutputType PSObject | Out-Null
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Write-Log "Mail gesendet: $(Split-Path $FilePath -Leaf)"
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Remove-Item -LiteralPath $FilePath -Force
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if (Test-Path -LiteralPath $metaPath) { Remove-Item -LiteralPath $metaPath -Force }
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return $true
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}
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catch {
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$retryCount = 0
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if ($meta -and $null -ne $meta.RetryCount) { $retryCount = [int]$meta.RetryCount }
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$retryCount++
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$maxRetries = [int]$script:Config.Queue.MaxRetries
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Write-Log "Graph-Versand fehlgeschlagen (Versuch $retryCount/$maxRetries): $($_.Exception.Message)" "WARN"
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if ($retryCount -ge $maxRetries) {
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$failedDir = Resolve-PathFromConfig $script:Config.Paths.Failed
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New-Item -ItemType Directory -Path $failedDir -Force | Out-Null
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Move-Item -LiteralPath $FilePath -Destination (Join-Path $failedDir (Split-Path $FilePath -Leaf)) -Force
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if (Test-Path -LiteralPath $metaPath) {
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Move-Item -LiteralPath $metaPath -Destination (Join-Path $failedDir (Split-Path $metaPath -Leaf)) -Force
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}
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Write-Log "Mail nach $retryCount Fehlversuchen nach FAILED verschoben." "ERROR"
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} else {
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$delays = @($script:Config.Queue.RetryMinutes)
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$delay = if ($retryCount -le $delays.Count) { [int]$delays[$retryCount - 1] } else { [int]$delays[-1] }
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$next = (Get-Date).AddMinutes($delay)
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$newMeta = [ordered]@{
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RetryCount = $retryCount
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NextAttemptUtc = $next.ToUniversalTime().ToString("o")
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LastError = $_.Exception.Message
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}
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$newMeta | ConvertTo-Json | Set-Content -LiteralPath $metaPath -Encoding UTF8
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}
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return $false
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}
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}
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function Process-Queue {
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$queueDir = Resolve-PathFromConfig $script:Config.Paths.Queue
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New-Item -ItemType Directory -Path $queueDir -Force | Out-Null
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foreach ($file in Get-ChildItem -LiteralPath $queueDir -Filter "*.eml" -File | Sort-Object CreationTimeUtc) {
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$metaPath = "$($file.FullName).json"
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if (Test-Path -LiteralPath $metaPath) {
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try {
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$meta = Get-Content -LiteralPath $metaPath -Raw -Encoding UTF8 | ConvertFrom-Json
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if ($meta.NextAttemptUtc) {
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$next = [DateTime]::Parse($meta.NextAttemptUtc).ToUniversalTime()
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if ($next -gt [DateTime]::UtcNow) { continue }
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}
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} catch {}
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}
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[void](Send-QueuedMail -FilePath $file.FullName)
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}
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}
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function Save-SmtpMessage {
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param(
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[Parameter(Mandatory)]
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[AllowEmptyCollection()]
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[AllowEmptyString()]
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[System.Collections.Generic.List[string]]$Lines,
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[Parameter(Mandatory)]
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[string]$MailFrom,
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[Parameter(Mandatory)]
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[string[]]$Recipients,
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[Parameter(Mandatory)]
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[string]$RemoteAddress
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)
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$queueDir = Resolve-PathFromConfig $script:Config.Paths.Queue
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New-Item -ItemType Directory -Path $queueDir -Force | Out-Null
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$id = "{0}-{1}" -f (Get-Date -Format "yyyyMMdd-HHmmssfff"), ([guid]::NewGuid().ToString("N").Substring(0,8))
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$path = Join-Path $queueDir "$id.eml"
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# SMTP DATA wird in CRLF normalisiert.
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$raw = ($Lines -join "`r`n") + "`r`n"
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$utf8NoBom = New-Object System.Text.UTF8Encoding($false)
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[IO.File]::WriteAllText($path, $raw, $utf8NoBom)
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$meta = [ordered]@{
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ReceivedUtc = [DateTime]::UtcNow.ToString("o")
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RemoteAddress = $RemoteAddress
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EnvelopeFrom = $MailFrom
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EnvelopeRecipients = @($Recipients)
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RetryCount = 0
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NextAttemptUtc = [DateTime]::UtcNow.ToString("o")
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}
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$meta | ConvertTo-Json -Depth 4 | Set-Content -LiteralPath "$path.json" -Encoding UTF8
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Write-Log "Mail angenommen: $id | Von=$MailFrom | An=$($Recipients -join ', ') | Client=$RemoteAddress"
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return $path
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}
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function Write-SmtpLine {
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param(
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[Parameter(Mandatory)][System.IO.StreamWriter]$Writer,
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[Parameter(Mandatory)][string]$Line
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)
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$Writer.WriteLine($Line)
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$Writer.Flush()
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}
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function Handle-SmtpClient {
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param([Parameter(Mandatory)][System.Net.Sockets.TcpClient]$Client)
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$remote = $Client.Client.RemoteEndPoint
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$remoteIp = ([System.Net.IPEndPoint]$remote).Address
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Write-Log "SMTP-Verbindung von $remoteIp"
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if (-not (Test-ClientAllowed -Address $remoteIp)) {
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try {
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$stream = $Client.GetStream()
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$writer = New-Object System.IO.StreamWriter($stream, [System.Text.Encoding]::ASCII)
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$writer.NewLine = "`r`n"
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$writer.AutoFlush = $true
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Write-SmtpLine $writer "554 5.7.1 Client not allowed"
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} catch {}
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$Client.Close()
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Write-Log "Client abgewiesen: $remoteIp" "WARN"
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return
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}
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$stream = $Client.GetStream()
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$stream.ReadTimeout = [int]$script:Config.Smtp.ClientTimeoutSeconds * 1000
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$reader = New-Object System.IO.StreamReader($stream, [System.Text.Encoding]::UTF8, $true, 4096, $true)
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$writer = New-Object System.IO.StreamWriter($stream, [System.Text.Encoding]::ASCII, 4096, $true)
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$writer.NewLine = "`r`n"
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$writer.AutoFlush = $true
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$mailFrom = $null
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$recipients = New-Object System.Collections.Generic.List[string]
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Write-SmtpLine $writer ("220 {0} SMTPGraphRelay ready" -f $script:Config.Smtp.Hostname)
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try {
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while ($Client.Connected) {
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$line = $reader.ReadLine()
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if ($null -eq $line) { break }
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if ($line -match '^(?i)(EHLO|HELO)\s+(.+)$') {
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Write-SmtpLine $writer ("250-{0}" -f $script:Config.Smtp.Hostname)
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Write-SmtpLine $writer ("250-SIZE {0}" -f ([int64]$script:Config.Smtp.MaxMessageSizeMB * 1024 * 1024))
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Write-SmtpLine $writer "250 8BITMIME"
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}
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elseif ($line -match '^(?i)MAIL FROM:\s*<([^>]*)>') {
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$mailFrom = $matches[1]
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$recipients.Clear()
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Write-SmtpLine $writer "250 2.1.0 OK"
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}
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elseif ($line -match '^(?i)RCPT TO:\s*<([^>]+)>') {
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if (-not $mailFrom) {
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Write-SmtpLine $writer "503 5.5.1 Need MAIL FROM first"
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continue
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}
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$recipients.Add($matches[1])
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Write-SmtpLine $writer "250 2.1.5 OK"
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}
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elseif ($line -match '^(?i)DATA\s*$') {
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if (-not $mailFrom -or $recipients.Count -eq 0) {
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Write-SmtpLine $writer "503 5.5.1 Need MAIL FROM and RCPT TO first"
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continue
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}
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Write-SmtpLine $writer "354 End data with <CR><LF>.<CR><LF>"
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$data = New-Object System.Collections.Generic.List[string]
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$size = 0
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$maxBytes = [int64]$script:Config.Smtp.MaxMessageSizeMB * 1024 * 1024
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$tooLarge = $false
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while ($true) {
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$dataLine = $reader.ReadLine()
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if ($null -eq $dataLine) { throw "Client disconnected during DATA" }
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if ($dataLine -eq ".") { break }
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# SMTP dot-stuffing rückgängig machen
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if ($dataLine.StartsWith("..")) { $dataLine = $dataLine.Substring(1) }
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$size += [System.Text.Encoding]::UTF8.GetByteCount($dataLine) + 2
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if ($size -gt $maxBytes) {
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$tooLarge = $true
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} elseif (-not $tooLarge) {
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$data.Add($dataLine)
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}
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}
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if ($tooLarge) {
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Write-SmtpLine $writer "552 5.3.4 Message size exceeds fixed maximum message size"
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Write-Log "Mail von $remoteIp wegen Größenlimit verworfen." "WARN"
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} else {
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[void](Save-SmtpMessage -Lines $data -MailFrom $mailFrom -Recipients $recipients.ToArray() -RemoteAddress $remoteIp.ToString())
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Write-SmtpLine $writer "250 2.0.0 Queued"
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}
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$mailFrom = $null
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$recipients.Clear()
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}
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elseif ($line -match '^(?i)RSET\s*$') {
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$mailFrom = $null
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$recipients.Clear()
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Write-SmtpLine $writer "250 2.0.0 Reset"
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}
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elseif ($line -match '^(?i)NOOP(?:\s+.*)?$') {
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Write-SmtpLine $writer "250 2.0.0 OK"
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}
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elseif ($line -match '^(?i)QUIT\s*$') {
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Write-SmtpLine $writer "221 2.0.0 Bye"
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break
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}
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elseif ($line -match '^(?i)(AUTH|STARTTLS)\b') {
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Write-SmtpLine $writer "502 5.5.1 Command not implemented"
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}
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else {
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Write-SmtpLine $writer "500 5.5.2 Command unrecognized"
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}
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}
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}
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catch {
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Write-Log "SMTP-Clientfehler ${remoteIp}: $($_.Exception.Message)" "WARN"
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}
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finally {
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try { $reader.Dispose() } catch {}
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try { $writer.Dispose() } catch {}
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try { $stream.Dispose() } catch {}
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try { $Client.Close() } catch {}
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}
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}
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if (-not (Test-Path -LiteralPath $ConfigPath)) {
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throw "Konfiguration nicht gefunden: $ConfigPath. Bitte zuerst Setup-SMTPGraphRelay.ps1 ausführen."
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}
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$script:Config = Get-Content -LiteralPath $ConfigPath -Raw -Encoding UTF8 | ConvertFrom-Json
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foreach ($p in @($script:Config.Paths.Queue, $script:Config.Paths.Failed, $script:Config.Paths.Logs)) {
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New-Item -ItemType Directory -Path (Resolve-PathFromConfig $p) -Force | Out-Null
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}
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$listenIp = [System.Net.IPAddress]::Parse($script:Config.Smtp.ListenAddress)
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$listener = [System.Net.Sockets.TcpListener]::new($listenIp, [int]$script:Config.Smtp.Port)
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$listener.Start()
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Write-Log "SMTPGraphRelay gestartet auf $($script:Config.Smtp.ListenAddress):$($script:Config.Smtp.Port)"
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Write-Log "Graph-Absender: $($script:Config.Graph.SenderMailbox)"
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$lastQueueRun = [DateTime]::MinValue
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try {
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while ($true) {
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if ((Get-Date) -gt $lastQueueRun.AddSeconds([int]$script:Config.Queue.PollSeconds)) {
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try { Process-Queue } catch { Write-Log "Queue-Worker: $($_.Exception.Message)" "ERROR" }
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$lastQueueRun = Get-Date
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}
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if ($listener.Pending()) {
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$client = $listener.AcceptTcpClient()
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# V1 verarbeitet Clients seriell. Für typische Geräte-/Monitoring-Relays bewusst simpel.
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Handle-SmtpClient -Client $client
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} else {
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Start-Sleep -Milliseconds 200
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}
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}
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}
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finally {
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$listener.Stop()
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Disconnect-MgGraph -ErrorAction SilentlyContinue | Out-Null
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Write-Log "SMTPGraphRelay beendet."
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}
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