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SimpleSpfDkimDmarcChecker.ps1 → security/SimpleSpfDkimDmarcChecker.ps1
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,141 +1,141 @@ | ||
| #Requires -Version 7 | ||
| #$ErrorActionPreference = "SilentlyContinue" | ||
| function DomainHealthChecker { | ||
| [CmdletBinding()] | ||
| param ( | ||
| # Check a single domain | ||
| [Parameter( | ||
| Mandatory, ParameterSetName = 'domain', | ||
| ValueFromPipeline = $True, | ||
| ValueFromPipelineByPropertyName = $True, | ||
| HelpMessage = "Specify domain name whose SPF, DMARC and DKIM record should be checked.", | ||
| Position = 1)] | ||
| [string]$Name, | ||
|
|
||
| # Check domains from a file | ||
| [Parameter( | ||
| Mandatory, ParameterSetName = 'file', | ||
| ValueFromPipeline = $True, | ||
| ValueFromPipelineByPropertyName = $True, | ||
| HelpMessage = "Specifies file name which contains a list of domain names.", | ||
| Position = 2)] | ||
| [System.IO.FileInfo]$File, | ||
|
|
||
| # DNS Server to use | ||
| [Parameter(Mandatory = $false, | ||
| Position = 3)] | ||
| [string]$Server = "1.1.1.1" | ||
| ) | ||
|
|
||
| begin { | ||
|
|
||
| class SpfDkimDmarc { | ||
| [string]$Name | ||
| [string]$SPFRecord | ||
| [string]$SpfAdvisory | ||
| [string]$DmarcRecord | ||
| [string]$DmarcAdvisory | ||
| [string]$DkimRecord | ||
| [string]$DkimAdvisory | ||
|
|
||
| # Constructor: Created the object with the SPF, DMARC and DKIM values | ||
| SpfDkimDmarc ( | ||
| [string]$d, | ||
| [string]$SPF, | ||
| [string]$SpfAdvisory, | ||
| [string]$DMARC, | ||
| [string]$DmarcAdvisory, | ||
| [string]$DKIM, | ||
| [string]$DkimAdvisory | ||
| ) { | ||
| $this.Name = $d | ||
| $this.SPFRecord = $SPF | ||
| $this.SpfAdvisory = $SpfAdvisory | ||
| $this.DmarcRecord = $DMARC | ||
| $this.DmarcAdvisory = $DmarcAdvisory | ||
| $this.DkimRecord = $DKIM | ||
| $this.DkimAdvisory = $DkimAdvisory | ||
| } | ||
| } | ||
| } | ||
|
|
||
| process { | ||
| if ($file) { | ||
| if (-not(Test-Path $file)) { | ||
| Write-error "$($file) does not exist" | ||
| return | ||
| } | ||
| } | ||
|
|
||
| function StartDomainHealthCheck($domain) { | ||
|
|
||
| # Check SPF-record | ||
| $SPF = Resolve-DnsName -type TXT -name $Domain -server $Server -ErrorAction SilentlyContinue | where-object { $_.strings -match "v=spf1" } | Select-Object -ExpandProperty strings | ||
| $SPFCount = ($SPF | Measure-Object).Count | ||
| if ($SPFCount -eq 0) { | ||
| $SpfAdvisory = "No SPF-record found" | ||
| } | ||
| elseif ($SPF -is [array]) { | ||
| $SpfAdvisory = "Domain has more than one SPF-record. One SPF record for one domain. This is explicitly defined in RFC4408" | ||
| } | ||
| elseif ($SPF -notmatch "-all") { | ||
| $SpfAdvisory = "An SPF-record is configured but the policy is not sufficiently strict" | ||
| } | ||
| elseif ($SPF -match "-all") { | ||
| $SpfAdvisory = "An SPF-record is configured and the policy is sufficiently strict." | ||
| } | ||
| elseif ($SPF -match "^?all") { | ||
| $SpfAdvisory = "Your domain has a valid SPF record but your policy is not effective enough." | ||
| } | ||
| Elseif ($SPF -notmatch "v=spf1" -or "all") { | ||
| $SpfAdvisory = "No SPF-record configured." | ||
| } | ||
|
|
||
| # Check DKIM-record | ||
| $DKIM = $null | ||
| $CnameSelector1 = Resolve-DnsName -Type CNAME -Name selector1._domainkey.$Domain -server $Server -ErrorAction SilentlyContinue | ||
| if ($CnameSelector1.NameHost -notcontains "domainkey") { | ||
| $DkimAdvisory = "We couldn't find a DKIM record associated with your domain." | ||
| } | ||
| else { | ||
| $DKIM = Resolve-DnsName -Type TXT -Name $CnameSelector1.namehost -server $Server | Select-Object -ExpandProperty strings | ||
| if ($DKIM -like "") { | ||
| $DkimAdvisory = "We couldn't find a DKIM record associated with your domain." | ||
| } | ||
| elseif ($DKIM -match "v=DKIM1") { | ||
| $DkimAdvisory = "DKIM-record is valid." | ||
| } | ||
| } | ||
|
|
||
| # Check DMARC-record | ||
| $DMARC = Resolve-DnsName -type TXT -name _dmarc.$Domain -Server $Server -ErrorAction SilentlyContinue | where-object { $_.strings -match "v=DMARC1" } | Select-Object -ExpandProperty strings | ||
| if ($DMARC -like "") { | ||
| $DmarcAdvisory = "Does not have a DMARC record. This domain is at risk to being abused by phishers and spammers." | ||
| } | ||
| elseif ($DMARC -match "p=quarantine") { | ||
| $DmarcAdvisory = "Domain has a DMARC record and it is set to p=quarantine. To fully take advantage of DMARC, the policy should be set to p=reject." | ||
| } | ||
| elseif ($DMARC -match "p=reject") { | ||
| $DmarcAdvisory = "Domain has a DMARC record and your DMARC policy will prevent abuse of your domain by phishers and spammers." | ||
| } | ||
| elseif ($DMARC -match "p=none") { | ||
| $DmarcAdvisory = "Domain has a valid DMARC record but the DMARC (subdomain) policy does not prevent abuse of your domain by phishers and spammers." | ||
| } | ||
|
|
||
| $ReturnValues = [SpfDkimDmarc]::New($Domain, $SPF, $SpfAdvisory, $DMARC, $DmarcAdvisory, $DKIM, $DkimAdvisory) | ||
| $ReturnValues | ||
| } | ||
|
|
||
| if ($file) { | ||
| foreach ($Domain in (Get-Content -Path $file)) { | ||
| StartDomainHealthCheck -Domain $Domain | ||
| } | ||
| } | ||
| if ($Name) { | ||
| foreach ($Domain in $Name) { | ||
| StartDomainHealthCheck -Domain $Name | ||
| } | ||
| } | ||
| } | ||
| end {} | ||
| } | ||
| #Requires -Version 7 | ||
| #$ErrorActionPreference = "SilentlyContinue" | ||
| function DomainHealthChecker { | ||
| [CmdletBinding()] | ||
| param ( | ||
| # Check a single domain | ||
| [Parameter( | ||
| Mandatory, ParameterSetName = 'domain', | ||
| ValueFromPipeline = $True, | ||
| ValueFromPipelineByPropertyName = $True, | ||
| HelpMessage = "Specify domain name whose SPF, DMARC and DKIM record should be checked.", | ||
| Position = 1)] | ||
| [string]$Name, | ||
|
|
||
| # Check domains from a file | ||
| [Parameter( | ||
| Mandatory, ParameterSetName = 'file', | ||
| ValueFromPipeline = $True, | ||
| ValueFromPipelineByPropertyName = $True, | ||
| HelpMessage = "Specifies file name which contains a list of domain names.", | ||
| Position = 2)] | ||
| [System.IO.FileInfo]$File, | ||
|
|
||
| # DNS Server to use | ||
| [Parameter(Mandatory = $false, | ||
| Position = 3)] | ||
| [string]$Server = "1.1.1.1" | ||
| ) | ||
|
|
||
| begin { | ||
|
|
||
| class SpfDkimDmarc { | ||
| [string]$Name | ||
| [string]$SPFRecord | ||
| [string]$SpfAdvisory | ||
| [string]$DmarcRecord | ||
| [string]$DmarcAdvisory | ||
| [string]$DkimRecord | ||
| [string]$DkimAdvisory | ||
|
|
||
| # Constructor: Created the object with the SPF, DMARC and DKIM values | ||
| SpfDkimDmarc ( | ||
| [string]$d, | ||
| [string]$SPF, | ||
| [string]$SpfAdvisory, | ||
| [string]$DMARC, | ||
| [string]$DmarcAdvisory, | ||
| [string]$DKIM, | ||
| [string]$DkimAdvisory | ||
| ) { | ||
| $this.Name = $d | ||
| $this.SPFRecord = $SPF | ||
| $this.SpfAdvisory = $SpfAdvisory | ||
| $this.DmarcRecord = $DMARC | ||
| $this.DmarcAdvisory = $DmarcAdvisory | ||
| $this.DkimRecord = $DKIM | ||
| $this.DkimAdvisory = $DkimAdvisory | ||
| } | ||
| } | ||
| } | ||
|
|
||
| process { | ||
| if ($file) { | ||
| if (-not(Test-Path $file)) { | ||
| Write-error "$($file) does not exist" | ||
| return | ||
| } | ||
| } | ||
|
|
||
| function StartDomainHealthCheck($domain) { | ||
|
|
||
| # Check SPF-record | ||
| $SPF = Resolve-DnsName -type TXT -name $Domain -server $Server -ErrorAction SilentlyContinue | where-object { $_.strings -match "v=spf1" } | Select-Object -ExpandProperty strings | ||
| $SPFCount = ($SPF | Measure-Object).Count | ||
| if ($SPFCount -eq 0) { | ||
| $SpfAdvisory = "No SPF-record found" | ||
| } | ||
| elseif ($SPF -is [array]) { | ||
| $SpfAdvisory = "Domain has more than one SPF-record. One SPF record for one domain. This is explicitly defined in RFC4408" | ||
| } | ||
| elseif ($SPF -notmatch "-all") { | ||
| $SpfAdvisory = "An SPF-record is configured but the policy is not sufficiently strict" | ||
| } | ||
| elseif ($SPF -match "-all") { | ||
| $SpfAdvisory = "An SPF-record is configured and the policy is sufficiently strict." | ||
| } | ||
| elseif ($SPF -match "^?all") { | ||
| $SpfAdvisory = "Your domain has a valid SPF record but your policy is not effective enough." | ||
| } | ||
| Elseif ($SPF -notmatch "v=spf1" -or "all") { | ||
| $SpfAdvisory = "No SPF-record configured." | ||
| } | ||
|
|
||
| # Check DKIM-record | ||
| $DKIM = $null | ||
| $CnameSelector1 = Resolve-DnsName -Type CNAME -Name selector1._domainkey.$Domain -server $Server -ErrorAction SilentlyContinue | ||
| if ($CnameSelector1.NameHost -notcontains "domainkey") { | ||
| $DkimAdvisory = "We couldn't find a DKIM record associated with your domain." | ||
| } | ||
| else { | ||
| $DKIM = Resolve-DnsName -Type TXT -Name $CnameSelector1.namehost -server $Server | Select-Object -ExpandProperty strings | ||
| if ($DKIM -like "") { | ||
| $DkimAdvisory = "We couldn't find a DKIM record associated with your domain." | ||
| } | ||
| elseif ($DKIM -match "v=DKIM1") { | ||
| $DkimAdvisory = "DKIM-record is valid." | ||
| } | ||
| } | ||
|
|
||
| # Check DMARC-record | ||
| $DMARC = Resolve-DnsName -type TXT -name _dmarc.$Domain -Server $Server -ErrorAction SilentlyContinue | where-object { $_.strings -match "v=DMARC1" } | Select-Object -ExpandProperty strings | ||
| if ($DMARC -like "") { | ||
| $DmarcAdvisory = "Does not have a DMARC record. This domain is at risk to being abused by phishers and spammers." | ||
| } | ||
| elseif ($DMARC -match "p=quarantine") { | ||
| $DmarcAdvisory = "Domain has a DMARC record and it is set to p=quarantine. To fully take advantage of DMARC, the policy should be set to p=reject." | ||
| } | ||
| elseif ($DMARC -match "p=reject") { | ||
| $DmarcAdvisory = "Domain has a DMARC record and your DMARC policy will prevent abuse of your domain by phishers and spammers." | ||
| } | ||
| elseif ($DMARC -match "p=none") { | ||
| $DmarcAdvisory = "Domain has a valid DMARC record but the DMARC (subdomain) policy does not prevent abuse of your domain by phishers and spammers." | ||
| } | ||
|
|
||
| $ReturnValues = [SpfDkimDmarc]::New($Domain, $SPF, $SpfAdvisory, $DMARC, $DmarcAdvisory, $DKIM, $DkimAdvisory) | ||
| $ReturnValues | ||
| } | ||
|
|
||
| if ($file) { | ||
| foreach ($Domain in (Get-Content -Path $file)) { | ||
| StartDomainHealthCheck -Domain $Domain | ||
| } | ||
| } | ||
| if ($Name) { | ||
| foreach ($Domain in $Name) { | ||
| StartDomainHealthCheck -Domain $Name | ||
| } | ||
| } | ||
| } | ||
| end {} | ||
| } |