Plugins/Cloudflare.ps1
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function Get-CurrentPluginType { 'dns-01' } function Add-DnsTxt { [CmdletBinding(DefaultParameterSetName='Email')] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [string]$TxtValue, [Parameter(ParameterSetName='Email',Mandatory,Position=2)] [string]$CFAuthEmail, [Parameter(ParameterSetName='Email',Mandatory,Position=3)] [string]$CFAuthKey, [Parameter(ParameterSetName='Bearer',Mandatory,Position=2)] [securestring]$CFToken, [Parameter(ParameterSetName='BearerInsecure',Mandatory,Position=2)] [string]$CFTokenInsecure, [Parameter(ValueFromRemainingArguments)] $ExtraParams ) $apiRoot = 'https://api.cloudflare.com/client/v4/zones' $authHeader = Get-CFAuthHeader @PSBoundParameters if (-not ($zoneID = Find-CFZone $RecordName $authHeader)) { throw "Unable to find Cloudflare hosted zone for $RecordName" } # check for an existing record Write-Debug "Checking for existing record" try { $getParams = @{ Uri = "$apiRoot/$zoneID/dns_records?type=TXT&name=$RecordName&content=$TxtValue" Headers = $authHeader Verbose = $false ErrorAction = 'Stop' } Write-Debug "GET $($getParams.Uri)" $response = Invoke-RestMethod @getParams @script:UseBasic } catch { throw } # add the new TXT record if necessary if ($response.result.Count -eq 0) { $bodyJson = @{ type="TXT"; name=$RecordName; content=$TxtValue } | ConvertTo-Json Write-Verbose "Adding $RecordName with value $TxtValue" try { $postParams = @{ Uri = "$apiRoot/$zoneID/dns_records" Method = 'Post' Body = $bodyJson ContentType = 'application/json' Headers = $authHeader Verbose = $false ErrorAction = 'Stop' } Write-Debug "POST $($postParams.Uri)" Write-Debug "Body`n$($postParams.Body)" Invoke-RestMethod @postParams @script:UseBasic | Out-Null } catch { throw } } else { Write-Debug "Record $RecordName with value $TxtValue already exists. Nothing to do." } <# .SYNOPSIS Add a DNS TXT record to Cloudflare. .DESCRIPTION Use Cloudflare V4 api to add a TXT record to a Cloudflare DNS zone. .PARAMETER RecordName The fully qualified name of the TXT record. .PARAMETER TxtValue The value of the TXT record. .PARAMETER CFAuthEmail The email address of the account used to connect to Cloudflare API .PARAMETER CFAuthKey The Global API Key associated with the email address entered in the CFAuthEmail parameter. .PARAMETER CFToken The scoped API Token that has been given read/write permissions to the necessary zones. This SecureString version can only be used from Windows or any OS with PowerShell Core 6.2+. .PARAMETER CFTokenInsecure The scoped API Token that has been given read/write permissions to the necessary zones. This standard String version may be used with any OS. .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. .EXAMPLE Add-DnsTxt '_acme-challenge.example.com' 'txt-value' 'admin@example.com' 'key' Adds a TXT record for the specified site with the specified value. #> } function Remove-DnsTxt { [CmdletBinding()] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [string]$TxtValue, [Parameter(ParameterSetName='Email',Mandatory,Position=2)] [string]$CFAuthEmail, [Parameter(ParameterSetName='Email',Mandatory,Position=3)] [string]$CFAuthKey, [Parameter(ParameterSetName='Bearer',Mandatory,Position=2)] [securestring]$CFToken, [Parameter(ParameterSetName='BearerInsecure',Mandatory,Position=2)] [string]$CFTokenInsecure, [Parameter(ValueFromRemainingArguments)] $ExtraParams ) $apiRoot = 'https://api.cloudflare.com/client/v4/zones' $authHeader = Get-CFAuthHeader @PSBoundParameters if (-not ($zoneID = Find-CFZone $RecordName $authHeader)) { throw "Unable to find Cloudflare hosted zone for $RecordName" } # check for an existing record Write-Debug "Checking for existing record" try { $getParams = @{ Uri = "$apiRoot/$zoneID/dns_records?type=TXT&name=$RecordName&content=$TxtValue" Headers = $authHeader Verbose = $false ErrorAction = 'Stop' } Write-Debug "GET $($getParams.Uri)" $response = Invoke-RestMethod @getParams @script:UseBasic } catch { throw } # remove the txt record if it exists if ($response.result.Count -gt 0) { $recID = $response.result[0].id Write-Verbose "Removing $RecordName with value $TxtValue" try { $delParams = @{ Uri = "$apiRoot/$zoneID/dns_records/$recID" Method = 'Delete' Headers = $authHeader Verbose = $false ErrorAction = 'Stop' } Write-Debug "DELETE $($delParams.Uri)" Invoke-RestMethod @delParams @script:UseBasic | Out-Null } catch { throw } } else { Write-Debug "Record $RecordName with value $TxtValue doesn't exist. Nothing to do." } <# .SYNOPSIS Remove a DNS TXT record from Cloudflare. .DESCRIPTION Use Cloudflare V4 api to remove a TXT record to a Cloudflare DNS zone. .PARAMETER RecordName The fully qualified name of the TXT record. .PARAMETER TxtValue The value of the TXT record. .PARAMETER CFAuthEmail The email address of the account used to connect to Cloudflare API. .PARAMETER CFAuthKey The Global API Key associated with the email address entered in the CFAuthEmail parameter. .PARAMETER CFToken The scoped API Token that has been given read/write permissions to the necessary zones. This SecureString version can only be used from Windows or any OS with PowerShell Core 6.2+. .PARAMETER CFTokenInsecure The scoped API Token that has been given read/write permissions to the necessary zones. This standard String version may be used with any OS. .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. .EXAMPLE Remove-DnsTxt '_acme-challenge.example.com' 'txt-value' 'admin@example.com' 'key' Removes a TXT record for the specified site with the specified value. #> } function Save-DnsTxt { [CmdletBinding()] param( [Parameter(ValueFromRemainingArguments)] $ExtraParams ) <# .SYNOPSIS Not required. .DESCRIPTION This provider does not require calling this function to commit changes to DNS records. .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. #> } ############################ # Helper Functions ############################ # API Docs: # https://api.cloudflare.com/ function Get-CFAuthHeader { [CmdletBinding(DefaultParameterSetName='Email')] param( [Parameter(ParameterSetName='Email',Mandatory,Position=0)] [string]$CFAuthEmail, [Parameter(ParameterSetName='Email',Mandatory,Position=1)] [string]$CFAuthKey, [Parameter(ParameterSetName='Bearer',Mandatory,Position=0)] [securestring]$CFToken, [Parameter(ParameterSetName='BearerInsecure',Mandatory,Position=0)] [string]$CFTokenInsecure, [Parameter(ValueFromRemainingArguments)] $ExtraConnectParams ) if ('Email' -eq $PSCmdlet.ParameterSetName) { return @{ 'X-Auth-Email' = $CFAuthEmail 'X-Auth-Key' = $CFAuthKey } } elseif ('Bearer' -eq $PSCmdlet.ParameterSetName) { $CFTokenInsecure = [pscredential]::new('a',$CFToken).GetNetworkCredential().Password return @{ Authorization = "Bearer $CFTokenInsecure" } } elseif ('BearerInsecure' -eq $PSCmdlet.ParameterSetName) { return @{ Authorization = "Bearer $CFTokenInsecure" } } else { throw "Unable to determine valid auth headers." } } function Find-CFZone { [CmdletBinding()] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [hashtable]$AuthHeader ) # setup a module variable to cache the record to zone mapping # so it's quicker to find later if (!$script:CFRecordZones) { $script:CFRecordZones = @{} } # check for the record in the cache if ($script:CFRecordZones.ContainsKey($RecordName)) { return $script:CFRecordZones.$RecordName } Write-Verbose "Attempting to find hosted zone for $RecordName" $apiRoot = 'https://api.cloudflare.com/client/v4/zones' # We need to find the zone ID for the closest/deepest sub-zone that would # contain the record. $pieces = $RecordName.Split('.') for ($i=0; $i -lt ($pieces.Count-1); $i++) { $zoneTest = $pieces[$i..($pieces.Count-1)] -join '.' Write-Debug "Checking $zoneTest" $response = $null try { $getParams = @{ Uri = "$apiRoot/?name=$zoneTest" Headers = $AuthHeader Verbose = $false ErrorAction = 'Stop' } Write-Debug "GET $($getParams.Uri)" $response = Invoke-RestMethod @getParams @script:UseBasic } catch { # UPDATE: As of Feb 2021, Cloudflare seems to have fixed the bug where # querying a zone that doesn't exist with a limited scope API token # throws an HTTP 403 error. It now works the same way it does with # the global key and just returns an empty result set. 403 errors now # only seem to be thrown on legitimate permission problems. if (403 -eq $_.Exception.Response.StatusCode.value__) { Write-Warning "There was a permissions error checking the existence of $zoneTest. This indicates the supplied credentials are invalid. Please double check your token permissions." } else { throw } } if ($response -and $response.result.Count -gt 0) { $zoneID = $response.result[0].id $script:CFRecordZones.$RecordName = $zoneID return $zoneID } } return $null } |