tak.Get-SPFRecord.ps1
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class SPFRecord { [String] $tag [string] $value SPFRecord([String] $tag, [string]$value) { $this.tag = $tag $this.value = $value } } function Get-IncludedSpf($string) { # this gets just the first include tag # [regex]::match($string,"include:(\S+)").groups[1].value # so instead we are creating temporary objects for all tags to then filter out all includes $splitString = $string -split " " | Where-Object {$_ -match ":"} $splitString = $splitString -split ":" for ($i = 0; $i -lt $splitString.Count; $i++) { if ([bool]!($i%2)) { [SPFRecord]::new($splitString[$i],$splitString[$i + 1]) } } } function Get-SPFRecord { <# .Synopsis Get SPF Record for a domain. If the include tag is present, recursively get that SPF Record, too. .DESCRIPTION This function uses Resolve-DNSName to recursively get the SPF Record for a given domain. Objects with a DomainName property, such as returned by Get-AcceptedDomain, can be piped to this function. .EXAMPLE Get-AcceptedDomain | Get-SPFRecord This example gets SPF records for all domains returned by Get-AcceptedDomain. #> [CmdletBinding(HelpUri = 'https://ntsystems.it/PowerShell/TAK/Get-SPFRecord/')] param ( # Specify the Domain name for the query. [Parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true, ValueFromPipeline = $true)] [string] $DomainName, # Specify the Domain name for the query. [string] $Server, [switch] $Recurse ) process { $params = @{ Type = "txt" Name = $DomainName ErrorAction = "Stop" } if ($Server) { $params.Add("Server", $Server) } try { $dns = Resolve-DnsName @params | Where-Object Strings -Match "spf1" $result = $dns | Select-Object @{Name = "DomainName"; Expression = { $_.Name } }, @{Name = "Record"; Expression = { $_.Strings } } # handle redirect if ($result.record -match "redirect=(.*)" -and $Recurse) { Get-SPFRecord $Matches[1] -Recurse } # handle include if ($result.record -match "include:" -and $Recurse) { $include = Get-IncludedSpf($result.record) $include.where{$_.tag -eq "include"}.Value | ForEach-Object { Write-Verbose "Found include: tag, looking up $_" Get-SPFRecord $_ -Recurse } } New-Object -TypeName psobject -Property ([ordered]@{ DomainName = $DomainName Record = $result.record }) } catch { Write-Warning $_ } } } |