Plugins/DeSEC.ps1
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function Get-CurrentPluginType { 'dns-01' } function Add-DnsTxt { [CmdletBinding(DefaultParameterSetName='Secure')] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [string]$TxtValue, [Parameter(ParameterSetName='Secure',Mandatory,Position=2)] [securestring]$DSToken, [Parameter(ParameterSetName='Insecure',Mandatory,Position=2)] [string]$DSTokenInsecure, [Parameter()] [int]$DSTTL = 300, [Parameter(ValueFromRemainingArguments)] $ExtraParams ) # convert the secure token to a normal string if ('Secure' -eq $PSCmdlet.ParameterSetName) { $DSTokenInsecure = (New-Object PSCredential ("user", $DSToken)).GetNetworkCredential().Password } $AuthHeader = @{ Authorization = "Token $($DSTokenInsecure)" } try { $rrset, $recordUri, $domain, $subname = Find-DeSECRRset $RecordName $AuthHeader if ($rrset) { if ("`"$TxtValue`"" -in $rrset.records) { Write-Debug "Record $RecordName already contains $TxtValue. Nothing to do." return } $rrset.records += "`"$TxtValue`"" $data = @{ records = $rrset.records } | ConvertTo-Json Write-Verbose "Adding record $RecordName with value $TxtValue to existing RRset." Invoke-deSEC $recordUri $AuthHeader -Method Patch -Body $data | Out-Null } else { $data = @{ subname = $subname "type" = "TXT" records = @("`"$TxtValue`"") ttl = $DSTTL } | ConvertTo-Json Write-Verbose "Creating new RRset for record $RecordName with value $TxtValue." Invoke-deSEC "/domains/$($domain)/rrsets/" $AuthHeader -Method Post -Body $data | Out-Null } } catch { throw } <# .SYNOPSIS Add a DNS TXT record to deSEC. .DESCRIPTION Add a DNS TXT record to deSEC. .PARAMETER RecordName The fully qualified name of the TXT record. .PARAMETER TxtValue The value of the TXT record. .PARAMETER DSToken The deSEC API authentication token for your account. .PARAMETER DSTokenInsecure The deSEC API authentication token for your account. .PARAMETER DSTTL The TTL of new TXT record (default 300). .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. .EXAMPLE $DSToken = ConvertTo-SecureString 'token-value' -AsPlainText -Force Add-DnsTxt '_acme-challenge.example.com' 'txt-value' $DSToken Adds a TXT record for the specified site with the specified value. #> } function Remove-DnsTxt { [CmdletBinding(DefaultParameterSetName='Secure')] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [string]$TxtValue, [Parameter(ParameterSetName='Secure',Mandatory,Position=2)] [securestring]$DSToken, [Parameter(ParameterSetName='Insecure',Mandatory,Position=2)] [string]$DSTokenInsecure, [Parameter(ValueFromRemainingArguments)] $ExtraParams ) # convert the secure token to a normal string if ('Secure' -eq $PSCmdlet.ParameterSetName) { $DSTokenInsecure = (New-Object PSCredential ("user", $DSToken)).GetNetworkCredential().Password } $AuthHeader = @{ Authorization = "Token $($DSTokenInsecure)" } # get existing record try { $rrset, $recordUri, $domain, $subname = Find-DeSECRRset $RecordName $AuthHeader if (!$rrset) { Write-Debug "Record $RecordName doesn't exist. Nothing to do." return } } catch { throw } if ("`"$TxtValue`"" -notin $rrset.records) { Write-Debug "Record $RecordName doesn't contain $TxtValue. Nothing to do." return } try { $data = @{ records = $rrset.records.where( { $_ -ne "`"$TxtValue`"" } ) } | ConvertTo-Json Write-Verbose "Deleting record $RecordName with value $TxtValue." Invoke-deSEC $recordUri $AuthHeader -Method Patch -Body $data | Out-Null } catch { throw } <# .SYNOPSIS Remove a DNS TXT record from deSEC. .DESCRIPTION Remove a DNS TXT record from deSEC. .PARAMETER RecordName The fully qualified name of the TXT record. .PARAMETER TxtValue The value of the TXT record. .PARAMETER DSToken The deSEC API authentication token for your account. .PARAMETER DSTokenInsecure The deSEC API authentication token for your account. .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. .EXAMPLE $DSToken = ConvertTo-SecureString 'token-value' -AsPlainText -Force Remove-DnsTxt '_acme-challenge.example.com' 'txt-value' $DSToken Removes a TXT record for the specified site with the specified value. #> } function Save-DnsTxt { [CmdletBinding()] param( [Parameter(ValueFromRemainingArguments)] $ExtraParams ) <# .SYNOPSIS Not required. .DESCRIPTION This provider does not require calling this function to commit changes to DNS records. .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. #> } ############################ # Helper Functions ############################ # API Docs: # https://desec.readthedocs.io/en/latest/quickstart.html function Find-DeSECRRset { [CmdletBinding()] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [hashtable]$AuthHeader ) Write-Verbose "Attempting to find hosted zone for $RecordName" if (!($domain = Find-DeSECZone $RecordName $AuthHeader)) { throw "Unable to find deSEC hosted zone for $RecordName" } $subname = ($RecordName -ireplace [regex]::Escape($domain), [string]::Empty).TrimEnd('.') # .NET thinks all URLS are Windows filenames (no trailing dot) # replace trailing ... with escaped %2e%2e%2e # https://stackoverflow.com/questions/856885/httpwebrequest-to-url-with-dot-at-the-end $recordUri = "/domains/$($domain)/rrsets/$($subname)%2e%2e%2e/TXT/" Write-Debug "$RecordName has URI: $recordUri" # get existing record try { $rrset = Invoke-deSEC $recordUri $AuthHeader return $rrset, $recordUri, $domain, $subname } catch { if (404 -eq $_.Exception.Response.StatusCode) { return $null, $null, $domain, $subname } throw } } function Find-DeSECZone { [CmdletBinding()] param( [Parameter(Mandatory,Position=0)] [string]$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:DSRecordZones) { $script:DSRecordZones = @{} } # check for the record in the cache if ($script:DSRecordZones.ContainsKey($RecordName)) { return $script:DSRecordZones.$RecordName } # get the list of available zones try { $zones = (Invoke-deSEC "/domains/" $AuthHeader).name } catch { throw } # Since the provider could be hosting both apex and sub-zones, we need to find the closest/deepest # sub-zone that would hold the record rather than just adding it to the apex. So for something # like _acme-challenge.site1.sub1.sub2.example.com, we'd look for zone matches in the following # order: # - site1.sub1.sub2.example.com # - sub1.sub2.example.com # - sub2.example.com # - example.com $pieces = $RecordName.Split('.') for ($i=0; $i -lt ($pieces.Count-1); $i++) { $zoneTest = $pieces[$i..($pieces.Count-1)] -join '.' Write-Debug "Checking $zoneTest" if ($zoneTest -in $zones) { $script:DSRecordZones.$RecordName = $zoneTest return $zoneTest } } return $null } function Invoke-DeSEC { [CmdletBinding()] param( [Parameter(Mandatory,Position=0)] [string]$Query, [Parameter(Mandatory,Position=1)] [hashtable]$AuthHeader, [Parameter(Position=2)] [Microsoft.PowerShell.Commands.WebRequestMethod]$Method=([Microsoft.PowerShell.Commands.WebRequestMethod]::Get), [string]$Body ) # To gracefully deal with deSEC's API throttling, we need to catch HTTP 429 # responses which *should* have a Retry-After header indicating how long we # need to wait to retry the request. # build the appropriate function parameters to splat $queryParams = @{ Uri = "https://desec.io/api/v1$Query" Method = $Method Headers = $AuthHeader ErrorAction = 'Stop' } if ($Body) { $queryParams.ContentType = 'application/json' $queryParams.Body = $Body } $retryHeader = 'Retry-After' $retrySeconds = 30 # default in case the header is missing from the response do { $retry = $false try { Invoke-RestMethod @queryParams @script:UseBasic } catch { # re-throw anything other than HTTP 429 if (429 -ne $_.Exception.Response.StatusCode) { throw } $retry = $true # Since we can't catch explicit exception types between PowerShell editions # without errors for non-existent types, we need to string match the type names # and re-throw anything we don't care about. $exType = $_.Exception.GetType().FullName $response = $_.Exception.Response if ('System.Net.WebException' -eq $exType) { # PowerShell Desktop edition # Response object: System.Net.HttpWebResponse # grab the retry timeout suggestion if it exists if ($retryHeader -in $response.Headers) { $retrySeconds = $response.GetResponseHeader($retryHeader) | Select-Object -First 1 Write-Debug "Got $retrySeconds from $retryHeader header" } } elseif ('Microsoft.PowerShell.Commands.HttpResponseException' -eq $exType) { # PowerShell Core edition # Linux Response: System.Net.Http.CurlHandler+CurlResponseMessage # Mac Response: ??? # Win Response: System.Net.Http.HttpResponseMessage # grab the retry timeout suggestion if it exists if ($retryHeader -in $response.Headers.Key) { $retrySeconds = ($response.Headers | Where-Object { $_.Key -eq $retryHeader }).Value | Select-Object -First 1 Write-Debug "Got $retrySeconds from $retryHeader header" } } else { throw } # Sleep for the suggested time Write-Verbose "deSEC API throttling triggered. Will retry in $retrySeconds second(s)." Start-Sleep -Seconds $retrySeconds } } while ($retry) } |