public/cisa/exchange/ConvertFrom-MailAuthenticationRecordSpf.ps1

<#
.SYNOPSIS
    Returns a structured RFC compliant object for the supplied SPF record
 
.DESCRIPTION
 
    Adapted from:
    - https://cloudbrothers.info/en/powershell-tip-resolve-spf/
    - https://github.com/cisagov/ScubaGear/blob/main/PowerShell/ScubaGear/Modules/Providers/ExportEXOProvider.psm1
    - https://xkln.net/blog/getting-mx-spf-dmarc-dkim-and-smtp-banners-with-powershell/
    - SPF https://datatracker.ietf.org/doc/html/rfc7208
 
record : v=spf1 include:_spf-a.microsoft.com include:_spf-b.microsoft.com include:_spf-c.microsoft.com include:_spf-ssg-a.msft.net include:spf-a.hotmail.com
           include:_spf1-meo.microsoft.com -all
terms : {SPFRecordTerm, SPFRecordTerm, SPFRecordTerm, SPFRecordTerm…}
warnings :
 
.EXAMPLE
    ConvertFrom-MailAuthenticationRecordSpf -DomainName "microsoft.com"
 
    Returns [SPFRecord] object or "Failure to obtain record"
#>


Function ConvertFrom-MailAuthenticationRecordSpf {
    [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingWriteHost', '', Justification = 'Colors are beautiful')]
    [OutputType([SPFRecord],[System.String])]
    [cmdletbinding()]
    param(
        [Parameter(Mandatory)]
        [string]$DomainName,

        [ipaddress]$DnsServerIpAddress = "1.1.1.1",

        [switch]$QuickTimeout,

        [switch]$NoHostsFile
    )

    begin {
        #todo, check that all is always at end,
        ###check that ptr isn't used,
        ###check for repeat modifiers,
        ###check for all and redirect,
        ###check for unrecognized modifiers,
        ###recommend exp if not found #https://datatracker.ietf.org/doc/html/rfc7208#section-6.2,
        ###check for macros #https://datatracker.ietf.org/doc/html/rfc7208#section-7,
        ###check for 10* include, a, mx, ptr, exists
        #[SPFRecordTerm]::new("include:_spf-a.microsoft.com")
        class SPFRecordTerm {
            [string]$term #term
            [string]$directive #directive
            [ValidateSet("+","-","~","?","")]
            [string]$qualifier #qual
            [ValidateSet("all","include","a","mx","ptr","ip4","ip6","exists","")]
            [string]$mechanism #mech
            [string]$mechanismTarget #mechTarget
            [string]$mechanismTargetCidr #cidr
            [ValidateSet("redirect","exp","")]
            [string]$modifier #mod
            [string]$modifierTarget #modTarget

            hidden $option = [Text.RegularExpressions.RegexOptions]::IgnoreCase
            hidden $matchTerms = "\s*(?'term'(?'directive'(?'qual'\+|-|~|\?)?(?'mech'all|include|a|mx|ptr|ip4|ip6|exists)(?::?(?'mechTarget'[^\s]+?(?'cidr'\/[^\s]+)?))?)(?:\s|$)|(?'mod'redirect|exp)(?:=(?'modTarget'[^\s]+))(?:\s|$))"

            SPFRecordTerm([string]$term){
                $this.term = $term
                $match = [regex]::Match($term,$this.matchTerms,$this.option)
                $this.directive = ($match.Groups|Where-Object{$_.Name -eq "directive"}).Value
                $qVal = ($match.Groups|Where-Object{$_.Name -eq "qual"}).Value
                if($qVal -eq ""){
                    $q = "?"
                }else{
                    $q = $qVal
                }
                $this.qualifier = $q
                $this.mechanism = ($match.Groups|Where-Object{$_.Name -eq "mech"}).Value
                $this.mechanismTarget = ($match.Groups|Where-Object{$_.Name -eq "mechTarget"}).Value
                $this.mechanismTargetCidr = ($match.Groups|Where-Object{$_.Name -eq "cidr"}).Value
                $this.modifier = ($match.Groups|Where-Object{$_.Name -eq "mod"}).Value
                $this.modifierTarget = ($match.Groups|Where-Object{$_.Name -eq "modTarget"}).Value
            }
        }

        #[spfrecord]::new("v=spf1 include:_spf-a.microsoft.com include:_spf-b.microsoft.com include:_spf-c.microsoft.com include:_spf-ssg-a.msft.net include:spf-a.hotmail.com include:_spf1-meo.microsoft.com -all")
        class SPFRecord {
            [string]$record
            [SPFRecordTerm[]]$terms
            [string]$warnings


            hidden $option = [Text.RegularExpressions.RegexOptions]::IgnoreCase# -bor [Text.RegularExpressions.RegexOptions]::Singleline
            hidden $matchRecord = "^v=spf1 .*$"
            #https://datatracker.ietf.org/doc/html/rfc7208#section-12
            hidden $matchTerms = "\s*(?'term'(?'directive'(?'qual'\+|-|~|\?)?(?'mech'all|include|a|mx|ptr|ip4|ip6|exists)(?::?(?'mechTarget'[^\s]+?(?'cidr'\/[^\s]+)?))?)(?:\s|$)|(?'mod'redirect|exp)(?:=(?'modTarget'[^\s]+))(?:\s|$))"

            SPFRecord([string]$inputRecord){
                $this.record = $inputRecord
                $match = [regex]::Matches($inputRecord,$this.matchRecord,$this.option)
                if(-not $match){
                    $this.warnings += "v: Record does not match spf1 version format"
                    break
                }
                if(($match|Measure-Object).Count -gt 1){
                    $this.warnings += "v: Multiple records match spf1 version format"
                    break
                }
                $recordTerms = [regex]::Matches($inputRecord,$this.matchTerms,$this.option)
                foreach($term in ($recordTerms.Groups|Where-Object{$_.Name -eq "term"})){
                    $this.terms += [SPFRecordTerm]::new($term.Value)
                }
            }
        }
    }

    process {
        $matchRecord = "^v=spf1 .*$"

        $spfSplat = @{
            Name         = $DomainName
            Type         = "TXT"
            Server       = $DnsServerIpAddress
            NoHostsFile  = $NoHostsFile
            QuickTimeout = $QuickTimeout
            ErrorAction  = "Stop"
        }
        try{
            if($IsWindows){
                $spfRecord = [SPFRecord]::new((Resolve-DnsName @spfSplat | `
                    Where-Object {$_.Type -eq "TXT"} | `
                    Where-Object {$_.Strings -imatch $matchRecord}).Strings)
            }else{
                $cmdletCheck = Get-Command "Resolve-Dns"
                if($cmdletCheck){
                    $spfSplatAlt = @{
                        Query       = $spfSplat.Name
                        QueryType   = $spfSplat.Type
                        NameServer  = $spfSplat.Server
                        ErrorAction = $spfSplat.ErrorAction
                    }
                    $spfRecord = [SPFRecord]::new(((Resolve-Dns @spfSplatAlt).Answers | `
                        Where-Object {$_.RecordType -eq "TXT"} | `
                        Where-Object {$_.Text -imatch $matchRecord}).Text)
                }else{
                    Write-Error "`nFor non-Windows platforms, please install DnsClient-PS module."
                    Write-Host "`n Install-Module DnsClient-PS -Scope CurrentUser`n" -ForegroundColor Yellow
                    return "Missing dependency, Resolve-Dns not available"
                }
            }
        }catch [System.Management.Automation.CommandNotFoundException]{
            Write-Error $_
            return "Unsupported platform, Resolve-DnsName not available"
        }catch{
            Write-Error $_
            return "Failure to obtain record"
        }

        return $spfRecord
    }
}
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