Maester

0.2.0

public/CISA/exchange/Resolve-SPFRecord.ps1

                                <#

.SYNOPSIS

    Returns a list of all IP addresses from an SPF record

.DESCRIPTION

    https://cloudbrothers.info/en/powershell-tip-resolve-spf/

.EXAMPLE

    Resolve-SPFRecord microsoft.com

#>

function Resolve-SPFRecord {

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

    [CmdletBinding()]

    param (

        # Domain Name

        [Parameter(Mandatory = $true,

            ValueFromPipeline = $true,

            ValueFromPipelineByPropertyName = $true,

            Position = 1)]

        [string]$Name,

        # DNS Server to use

        [Parameter(Mandatory = $false,

            ValueFromPipelineByPropertyName = $true,

            Position = 2)]

        [string]$Server = "1.1.1.1",

        # If called nested provide a referrer to build valid objects

        [Parameter(Mandatory = $false)]

        [string]$Referrer

    )

    begin {

        class SPFRecord {

            [string] $SPFSourceDomain

            [string] $IPAddress

            [string] $Referrer

            [string] $Qualifier

            [bool] $Include

            # Constructor: Creates a new SPFRecord object, with a specified IPAddress

            SPFRecord ([string] $IPAddress) {

                $this.IPAddress = $IPAddress

            }

            # Constructor: Creates a new SPFRecord object, with a specified IPAddress and DNSName

            SPFRecord ([string] $IPAddress, [String] $DNSName) {

                $this.IPAddress = $IPAddress

                $this.SPFSourceDomain = $DNSName

            }

            # Constructor: Creates a new SPFRecord object, with a specified IPAddress and DNSName and

            SPFRecord ([string] $IPAddress, [String] $DNSName, [String] $Qualifier) {

                $this.IPAddress = $IPAddress

                $this.SPFSourceDomain = $DNSName

                $this.Qualifier = $Qualifier

            }

        }

    }

    process {

        # Keep track of number of DNS queries

        # DNS Lookup Limit = 10

        # https://tools.ietf.org/html/rfc7208#section-4.6.4

        # Query DNS Record

        try{

            $DNSRecords = Resolve-DnsName -Server $Server -Name $Name -Type TXT

        }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"

        }

        # Check SPF record

        $SPFRecord = $DNSRecords | Where-Object { $_.Strings -match "^v=spf1" }

        # Validate SPF record

        $SPFCount = ($SPFRecord | Measure-Object).Count

        if ( $SPFCount -eq 0) {

            # If there is no error show an error

            Write-Error "No SPF record found for `"$Name`""

        }

        elseif ( $SPFCount -ge 2 ) {

            # Multiple DNS Records are not allowed

            # https://tools.ietf.org/html/rfc7208#section-3.2

            Write-Error "There is more than one SPF for domain `"$Name`""

        }

        else {

            # Multiple Strings in a Single DNS Record

            # https://tools.ietf.org/html/rfc7208#section-3.3

            $SPFString = $SPFRecord.Strings -join ''

            # Split the directives at the whitespace

            $SPFDirectives = $SPFString -split " "

            # Check for a redirect

            if ( $SPFDirectives -match "redirect" ) {

                $RedirectRecord = $SPFDirectives -match "redirect" -replace "redirect="

                Write-Verbose "[REDIRECT]`t$RedirectRecord"

                # Follow the include and resolve the include

                Resolve-SPFRecord -Name "$RedirectRecord" -Server $Server -Referrer $Name

            }

            else {

                # Extract the qualifier

                $Qualifier = switch ( $SPFDirectives -match "^[+-?~]all$" -replace "all" ) {

                    "+" { "pass" }

                    "-" { "fail" }

                    "~" { "softfail" }

                    "?" { "neutral" }

                }

                $ReturnValues = foreach ($SPFDirective in $SPFDirectives) {

                    switch -Regex ($SPFDirective) {

                        "%[{%-_]" {

                            Write-Warning "[$_]`tMacros are not supported. For more information, see https://tools.ietf.org/html/rfc7208#section-7"

                            Continue

                        }

                        "^exp:.*$" {

                            Write-Warning "[$_]`tExplanation is not supported. For more information, see https://tools.ietf.org/html/rfc7208#section-6.2"

                            Continue

                        }

                        '^include:.*$' {

                            # Follow the include and resolve the include

                            Resolve-SPFRecord -Name ( $SPFDirective -replace "^include:" ) -Server $Server -Referrer $Name

                        }

                        '^ip[46]:.*$' {

                            Write-Verbose "[IP]`tSPF entry: $SPFDirective"

                            $SPFObject = [SPFRecord]::New( ($SPFDirective -replace "^ip[46]:"), $Name, $Qualifier)

                            if ( $PSBoundParameters.ContainsKey('Referrer') ) {

                                $SPFObject.Referrer = $Referrer

                                $SPFObject.Include = $true

                            }

                            $SPFObject

                        }

                        '^a:.*$' {

                            Write-Verbose "[A]`tSPF entry: $SPFDirective"

                            $DNSRecords = Resolve-DnsName -Server $Server -Name $Name -Type A

                            # Check SPF record

                            foreach ($IPAddress in ($DNSRecords.IPAddress) ) {

                                $SPFObject = [SPFRecord]::New( $IPAddress, ($SPFDirective -replace "^a:"), $Qualifier)

                                if ( $PSBoundParameters.ContainsKey('Referrer') ) {

                                    $SPFObject.Referrer = $Referrer

                                    $SPFObject.Include = $true

                                }

                                $SPFObject

                            }

                        }

                        '^mx:.*$' {

                            Write-Verbose "[MX]`tSPF entry: $SPFDirective"

                            $DNSRecords = Resolve-DnsName -Server $Server -Name $Name -Type MX

                            foreach ($MXRecords in ($DNSRecords.NameExchange) ) {

                                # Check SPF record

                                $DNSRecords = Resolve-DnsName -Server $Server -Name $MXRecords -Type A

                                foreach ($IPAddress in ($DNSRecords.IPAddress) ) {

                                    $SPFObject = [SPFRecord]::New( $IPAddress, ($SPFDirective -replace "^mx:"), $Qualifier)

                                    if ( $PSBoundParameters.ContainsKey('Referrer') ) {

                                        $SPFObject.Referrer = $Referrer

                                        $SPFObject.Include = $true

                                    }

                                    $SPFObject

                                }

                            }

                        }

                        Default {

                            Write-Warning "[$_]`t Unknown directive"

                        }

                    }

                }

                $DNSQuerySum = $ReturnValues | Select-Object -Unique SPFSourceDomain | Measure-Object | Select-Object -ExpandProperty Count

                if ( $DNSQuerySum -gt 6) {

                    Write-Warning "Watch your includes!`nThe maximum number of DNS queries is 10 and you have already $DNSQuerySum.`nCheck https://tools.ietf.org/html/rfc7208#section-4.6.4"

                }

                if ( $DNSQuerySum -gt 10) {

                    Write-Error "Too many DNS queries made ($DNSQuerySum).`nMust not exceed 10 DNS queries.`nCheck https://tools.ietf.org/html/rfc7208#section-4.6.4"

                }

                return $ReturnValues

            }

        }

    }

    end {

    }

}

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