Maester

0.3.2-preview

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"

.LINK

    https://maester.dev/docs/commands/ConvertFrom-MailAuthenticationRecordSpf

#>

function ConvertFrom-MailAuthenticationRecordSpf {

    [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingWriteHost', '', Justification = 'Colors are beautiful')]

    [OutputType([SPFRecord], [System.String])]

    [cmdletbinding()]

    param(

        [Parameter(Mandatory)]

        # Domain name to check.

        [string]$DomainName,

        # DNS-server to use for lookup.

        [ipaddress]$DnsServerIpAddress = "1.1.1.1",

        # Use a shorter timeout value for the DNS lookup.

        [switch]$QuickTimeout,

        # Ignore hosts file for domain lookup.

        [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 -or $PSVersionTable.PSEdition -eq "Desktop" ) {

                $spfRecord = [SPFRecord]::new((Resolve-DnsName @spfSplat | `

                            Where-Object { $_.Type -eq "TXT" } | `

                            Where-Object { $_.Strings -imatch $matchRecord }).Strings)

            } else {

                $cmdletCheck = Get-Command "Resolve-Dns" -ErrorAction SilentlyContinue

                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-Verbose "`nFor non-Windows platforms, please install DnsClient-PS module."

                    Write-Verbose "`n    Install-Module DnsClient-PS -Scope CurrentUser`n" -ForegroundColor Yellow

                    return "Missing dependency, Resolve-Dns not available"

                }

            }

        } catch [System.Management.Automation.CommandNotFoundException] {

            Write-Verbose $_

            return "Unsupported platform, Resolve-DnsName not available"

        } catch {

            Write-Verbose $_

            return "Failure to obtain record"

        }

        return $spfRecord

    }

}

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