Maester

1.3.13-preview

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

.LINK

    https://maester.dev/docs/commands/Resolve-SPFRecord

#>

function Resolve-SPFRecord {

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

    [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,

        # 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 {

            if ($isWindows -or $PSVersionTable.PSEdition -eq "Desktop") {

                if ($Server) {

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

                } else {

                    $DNSRecords = Resolve-DnsName -Name $Name -Type TXT -ErrorAction Stop

                }

            } else {

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

                if ($cmdletCheck) {

                    $answers = (Resolve-Dns -NameServer $Server -Query $Name -QueryType TXT).Answers

                    $DNSRecords = $answers | ForEach-Object {

                        [PSCustomObject]@{

                            Name    = $_.DomainName

                            Type    = $_.RecordType

                            TTL     = $_.TimeToLive

                            Strings = $_.Text

                        }

                    }

                } else {

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

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

                    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"

        }

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

                            Continue

                        }

                        "^exp:.*$" {

                            Write-Verbose "[$_]`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"

                            if ( $isWindows -or $PSVersionTable.PSEdition -eq "Desktop" ) {

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

                            } else {

                                $answers = (Resolve-Dns -NameServer $Server -Query $Name -QueryType A).Answers

                                $DNSRecords = $answers | ForEach-Object {

                                    [PSCustomObject]@{

                                        Name       = $_.DomainName

                                        Type       = $_.RecordType

                                        TTL        = $_.TimeToLive

                                        DataLength = $_.RawDataLength

                                        Section    = "Answer"

                                        IPAddress  = $_.Address

                                    }

                                }

                            }

                            # 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"

                            if ( $isWindows -or $PSVersionTable.PSEdition -eq "Desktop" ) {

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

                            } else {

                                $answers = (Resolve-Dns -NameServer $Server -Query $Name -QueryType MX).Answers

                                $DNSRecords = $answers | ForEach-Object {

                                    [PSCustomObject]@{

                                        Name         = $_.DomainName

                                        Type         = $_.RecordType

                                        TTL          = $_.TimeToLive

                                        NameExchange = $_.Exchange

                                        Preference   = $_.Preference

                                    }

                                }

                            }

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

                                # Check SPF record

                                if ( $isWindows -or $PSVersionTable.PSEdition -eq "Desktop" ) {

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

                                } else {

                                    $answers = (Resolve-Dns -NameServer $Server -Query $Name -QueryType A).Answers

                                    $DNSRecords = $answers | ForEach-Object {

                                        [PSCustomObject]@{

                                            Name       = $_.DomainName

                                            Type       = $_.RecordType

                                            TTL        = $_.TimeToLive

                                            DataLength = $_.RawDataLength

                                            Section    = "Answer"

                                            IPAddress  = $_.Address

                                        }

                                    }

                                }

                                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-Verbose "[$_]`t Unknown directive"

                        }

                    }

                }

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

                if ( $DNSQuerySum -gt 6) {

                    Write-Verbose "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-Verbose "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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