Maester

0.2.0

public/CISA/exchange/ConvertFrom-MailAuthenticationRecordDmarc.ps1

                                <#

.SYNOPSIS

    Returns structured RFC compliant object for a DMARC 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/

    - DMARC https://datatracker.ietf.org/doc/html/rfc7489

record               : v=DMARC1; p=reject; pct=100; rua=mailto:itex-rua@microsoft.com; ruf=mailto:itex-ruf@microsoft.com; fo=1

valid                : True

policy               : reject

policySubdomain      :

percentage           : 100

reportAggregate      : {DMARCRecordUri}

reportForensic       : {DMARCRecordUri}

reportFailure        : {1}

reportFailureFormats : {afrf}

reportFrequency      : 86400

alignmentDkim        : r

alignmentSpf         : r

version              : DMARC1

warnings             : {sp: No subdomain policy set, adkim: No DKIM alignment set, defaults to relaxed, aspf: No SPF alignment set, defaults to relaxed, ri: No

                       report interval set, defaults to 86400 seconds…}

.EXAMPLE

    ConvertFrom-MailAuthenticationRecordDmarc -DomainName "microsoft.com"

    Returns [DMARCRecord] or "Failure to obtain record"

#>

Function ConvertFrom-MailAuthenticationRecordDmarc {

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

    [cmdletbinding()]

    param(

        [Parameter(Mandatory)]

        [string]$DomainName,

        [ipaddress]$DnsServerIpAddress = "1.1.1.1",

        [switch]$QuickTimeout,

        [switch]$NoHostsFile

    )

    begin {

        #[DMARCRecordUri]::new("mailto:itex-ruf@microsoft.com")

        class DMARCRecordUri {

            [string]$uri

            [mailaddress]$mailAddress

            [string]$reportSizeLimit

            hidden $option = [Text.RegularExpressions.RegexOptions]::IgnoreCase

            hidden $matchUri = "(?'uri'mailto:(?'address'[^,!]*)(?:!(?'size'\d+(?:k|m|g|t)))?)(?:,|$)"

            DMARCRecordUri([string]$uri){

                $this.uri = $uri

                $match = [regex]::Match($uri,$this.matchUri,$this.option)

                $this.mailAddress = ($match.Groups|Where-Object{$_.Name -eq "address"}).Value

                $this.reportSizeLimit = ($match.Groups|Where-Object{$_.Name -eq "size"}).Value

            }

        }

        #[DMARCRecord]::new("v=DMARC1; p=reject; pct=100; rua=mailto:itex-rua@microsoft.com; ruf=mailto:itex-ruf@microsoft.com; fo=1")

        class DMARCRecord {

            [string]$record

            [bool]$valid

            [ValidateSet("none","quarantine","reject")]

            [string]$policy #p

            [string]$policySubdomain #sp

            [ValidateRange(0,100)]

            [int]$percentage = 100 #pct

            [DMARCRecordUri[]]$reportAggregate #rua

            [DMARCRecordUri[]]$reportForensic #ruf

            [ValidateSet("0","1","d","s")]

            [string[]]$reportFailure #fo

            [string[]]$reportFailureFormats = "afrf" #rf

            [int]$reportFrequency = 86400 #ri

            [ValidateSet("r","s")]

            [string]$alignmentDkim = "r" #adkim

            [ValidateSet("r","s")]

            [string]$alignmentSpf = "r" #aspf

            [string]$version = "DMARC1"

            [string[]]$warnings

            hidden $option = [Text.RegularExpressions.RegexOptions]::IgnoreCase

            hidden $matchInit = "^v\s*=\s*(?'v'DMARC1)\s*;\s*p\s*=\s*(?'p'none|quarantine|reject)(?:$|\s*;\s*)"

            hidden $matchSp = "sp\s*=\s*(?'sp'none|quarantine|reject)(?:$|\s*;\s*)"

            hidden $matchRua = "rua\s*=\s*(?'rua'[^;]+)(?:$|\s*;\s*)"

            hidden $matchRuf = "ruf\s*=\s*(?'ruf'[^;]+)(?:$|\s*;\s*)"

            hidden $matchUri = "(?'uri'mailto:(?'address'[^,!]*)(?:!(?'size'\d+(?:k|m|g|t)))?)(?:,|$)"

            hidden $matchAdkim = "adkim\s*=\s*(?'adkim'r|s)(?:$|\s*;\s*)"

            hidden $matchAspf = "aspf\s*=\s*(?'aspf'r|s)(?:$|\s*;\s*)"

            hidden $matchRi = "ri\s*=\s*(?'ri'\d+)(?:$|\s*;\s*)"

            hidden $matchFo = "fo\s*=\s*(?'fo'.{1})(?:$|\s*;\s*)"

            hidden $matchOptions = "(?'opt'[^:\s])(?:\s*:|\s*$)"

            hidden $matchRf = "rf\s*=\s*(?'rf'[^;]+)(?:$|\s*;\s*)"

            hidden $matchFormat = "(?'format'[^:\s]*)(?:\s*:|\s*$)"

            hidden $matchPct = "pct\s*=\s*(?'pct'\d{1,3})(?:$|\s*;\s*)"

            DMARCRecord([string]$record){

                $this.record = $record

                $init = $record -match $this.matchInit

                $this.valid = $init

                if(-not $init){

                    $this.warnings += "v/p: Record version (v) and policy (p) configuration is not proper"

                    exit

                }

                $this.version = $Matches["v"]

                $this.policy = $Matches["p"]

                $sp = $record -match $this.matchSp

                if(-not $sp){

                    $this.warnings += "sp: No subdomain policy set"

                }else{

                    $this.policySubdomain = $Matches["sp"]

                }

                $rua = $record -match $this.matchRua

                if(-not $rua){

                    $this.warnings += "rua: No aggregate report URI set"

                }else{

                    $uris = [regex]::Matches($Matches["rua"],$this.matchUri,$this.option)

                    foreach($uri in ($uris.Groups|Where-Object{$_.Name -eq "uri"})){

                        $this.reportAggregate += [DMARCRecordUri]::new("$uri")

                    }

                    if(($uris.Groups|Where-Object{$_.Name -eq "uri"}|Measure-Object).Count -gt 2){

                        $this.warnings += "ruf: More than 2 URIs set and may be ignored"

                    }

                }

                $ruf = $record -match $this.matchRuf

                if(-not $ruf){

                    $this.warnings += "ruf: No forensic report URI set"

                }else{

                    $uris = [regex]::Matches($Matches["ruf"],$this.matchUri,$this.option)

                    foreach($uri in ($uris.Groups|Where-Object{$_.Name -eq "uri"})){

                        $this.reportForensic += [DMARCRecordUri]::new("$uri")

                    }

                    if(($uris.Groups|Where-Object{$_.Name -eq "uri"}|Measure-Object).Count -gt 2){

                        $this.warnings += "ruf: More than 2 URIs set and may be ignored"

                    }

                }

                $adkim = $record -match $this.matchAdkim

                if(-not $adkim){

                    $this.warnings += "adkim: No DKIM alignment set, defaults to relaxed"

                }else{

                    $this.alignmentDkim = $Matches["adkim"]

                }

                $aspf = $record -match $this.matchAspf

                if(-not $aspf){

                    $this.warnings += "aspf: No SPF alignment set, defaults to relaxed"

                }else{

                    $this.alignmentSpf = $Matches["aspf"]

                }

                $ri = $record -match $this.matchRi

                if(-not $ri){

                    $this.warnings += "ri: No report interval set, defaults to 86400 seconds"

                }else{

                    $this.ri = $Matches["ri"]

                }

                $fo = $record -match $this.matchFo

                if(-not $fo){

                    $this.reportFailure = "0"

                    $this.warnings += "fo: No failure reporting option specified, default (0) report when all mechanisms fail to pass"

                }elseif($fo -and -not $ruf){

                    $this.warnings += "fo: Failure reporting option specified, but no ruf URI set"

                }else{

                    $options = [regex]::Matches($Matches["fo"],$this.matchOptions,$this.option)

                    foreach($option in ($options.Groups|Where-Object{$_.Name -eq "opt"})){

                        $this.reportFailure += $option

                    }

                }

                $rf = $record -match $this.matchRf

                if(-not $rf){

                    $this.warnings += "rf: No failure report format specified, defaults to afrf"

                }else{

                    $formats = [regex]::Matches($Matches["rf"],$this.matchFormat,$this.option)

                    foreach($format in $formats.Groups|Where-Object{$_.Name -eq "format"}){

                        switch ($format.Value) {

                            "afrf" {

                                $this.reportFailureFormats += $format.Value

                            }

                            "" {}

                            Default {

                                $this.reportFailureFormats += $format.Value

                                $this.warnings += "rf: Unkown failure report format ($($format.Value)) specified"

                            }

                        }

                    }

                }

                $pct = $record -match $this.matchPct

                if(-not $pct){

                    $this.warnings += "pct: No percentage of messages specified to apply policy to, defaults to 100"

                }else{

                    $this.percentage = $Matches["pct"]

                }

            }

        }

    }

    process {

        $dmarcPrefix = "_dmarc."

        $matchRecord = "^v\s*=\s*(?'v'DMARC1)\s*;\s*p\s*=\s*(?'p'none|quarantine|reject)(?:$|\s*;\s*)"

        $dmarcSplat = @{

            Name         = "$dmarcPrefix$DomainName"

            Type         = "TXT"

            Server       = $DnsServerIpAddress

            NoHostsFile  = $NoHostsFile

            QuickTimeout = $QuickTimeout

            ErrorAction  = "Stop"

        }

        try{

            $dmarcRecord = [DMARCRecord]::new((Resolve-DnsName @dmarcSplat | `

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

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

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

            Write-Error $Error[0]

            return "Unsupported platform, Resolve-DnsName not available"

        }catch{

            Write-Error $Error[0]

            return "Failure to obtain record"

        }

        return $dmarcRecord

    }

}

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