Plugins/GCloud.ps1
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function Get-CurrentPluginType { 'dns-01' } function Add-DnsTxt { [CmdletBinding()] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [string]$TxtValue, [Parameter(Mandatory,Position=2)] [string]$GCKeyFile, [Parameter(ValueFromRemainingArguments)] $ExtraParams ) # Cloud DNS API Reference # https://cloud.google.com/dns/api/v1beta2/ Connect-GCloudDns $GCKeyFile $token = $script:GCToken Write-Verbose "Attempting to find hosted zone for $RecordName" if (!($zoneID = Find-GCZone $RecordName)) { throw "Unable to find Google hosted zone for $RecordName" } $recRoot = "https://www.googleapis.com/dns/v1beta2/projects/$($token.ProjectID)/managedZones/$zoneID" # query the current txt record set try { $response = Invoke-RestMethod "$recRoot/rrsets?type=TXT&name=$RecordName." ` -Headers $script:GCToken.AuthHeader @script:UseBasic Write-Debug ($response | ConvertTo-Json -Depth 5) } catch { throw } $rrsets = $response.rrsets if ($rrsets.Count -eq 0) { # create a new record from scratch Write-Debug "Creating new record for $RecordName" $changeBody = @{additions=@(@{ name="$RecordName."; type='TXT'; ttl=10; rrdatas=@("`"$TxtValue`"") })} } else { if ("`"$TxtValue`"" -in $rrsets[0].rrdatas) { Write-Debug "Record $RecordName already contains $TxtValue. Nothing to do." return } # append to the existing value list which basically involves # both deleting and re-creating the record in the same "change" # operation Write-Debug "Appending to $RecordName with $($rrsets[0].Count) existing value(s)" $toDelete = $rrsets[0] | ConvertTo-Json | ConvertFrom-Json $rrsets[0].rrdatas += "`"$TxtValue`"" $changeBody = @{ deletions=@($toDelete); additions=@($rrsets[0]); } } Write-Verbose "Sending update for $RecordName" Write-Debug ($changeBody | ConvertTo-Json -Depth 5) try { $response = Invoke-RestMethod "$recRoot/changes" -Method Post ` -Body ($changeBody | ConvertTo-Json -Depth 5) ` -Headers $script:GCToken.AuthHeader ` -ContentType 'application/json' @script:UseBasic Write-Debug ($response | ConvertTo-Json -Depth 5) } catch { throw } <# .SYNOPSIS Add a DNS TXT record to Google Cloud DNS. .DESCRIPTION Add a DNS TXT record to Google Cloud DNS. .PARAMETER RecordName The fully qualified name of the TXT record. .PARAMETER TxtValue The value of the TXT record. .PARAMETER GCKeyFile Path to a service account JSON file that contains the account's private key and other metadata. This should have been downloaded when originally creating the service 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 Add-DnsTxt '_acme-challenge.example.com' 'txt-value' -GCKeyFile .\account.json Adds a TXT record for the specified site with the specified value using the specified Google Cloud service account. #> } function Remove-DnsTxt { [CmdletBinding()] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [string]$TxtValue, [Parameter(Mandatory,Position=2)] [string]$GCKeyFile, [Parameter(ValueFromRemainingArguments)] $ExtraParams ) # Cloud DNS API Reference # https://cloud.google.com/dns/api/v1beta2/ Connect-GCloudDns $GCKeyFile $token = $script:GCToken Write-Verbose "Attempting to find hosted zone for $RecordName" if (!($zoneID = Find-GCZone $RecordName)) { throw "Unable to find Google hosted zone for $RecordName" } $recRoot = "https://www.googleapis.com/dns/v1beta2/projects/$($token.ProjectID)/managedZones/$zoneID" # query the current txt record set try { $response = Invoke-RestMethod "$recRoot/rrsets?type=TXT&name=$RecordName." ` -Headers $script:GCToken.AuthHeader @script:UseBasic Write-Debug ($response | ConvertTo-Json -Depth 5) } catch { throw } $rrsets = $response.rrsets if ($rrsets.Count -eq 0) { Write-Debug "Record $RecordName already deleted." return } else { if ("`"$TxtValue`"" -notin $rrsets[0].rrdatas) { Write-Debug "Record $RecordName doesn't contain $TxtValue. Nothing to do." return } # removing the value involves deleting the existing record and # re-creating it without the value in the same change set. But if it's # the last one, we just want to delete it. Write-Debug "Removing from $RecordName with $($rrsets[0].Count) existing value(s)" $changeBody = @{ deletions=@(($rrsets[0] | ConvertTo-Json | ConvertFrom-Json)) } if ($rrsets[0].rrdatas.Count -gt 1) { $rrsets[0].rrdatas = @($rrsets[0].rrdatas | Where-Object { $_ -ne "`"$TxtValue`"" }) $changeBody.additions = @($rrsets[0]) } } Write-Verbose "Sending update for $RecordName" Write-Debug ($changeBody | ConvertTo-Json -Depth 5) try { $response = Invoke-RestMethod "$recRoot/changes" -Method Post ` -Body ($changeBody | ConvertTo-Json -Depth 5) ` -Headers $script:GCToken.AuthHeader ` -ContentType 'application/json' @script:UseBasic Write-Debug ($response | ConvertTo-Json -Depth 5) } catch { throw } <# .SYNOPSIS Remove a DNS TXT record from Google Cloud DNS. .DESCRIPTION Remove a DNS TXT record from Google Cloud DNS. .PARAMETER RecordName The fully qualified name of the TXT record. .PARAMETER TxtValue The value of the TXT record. .PARAMETER GCKeyFile Path to a service account JSON file that contains the account's private key and other metadata. This should have been downloaded when originally creating the service 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 Remove-DnsTxt '_acme-challenge.example.com' 'txt-value' -GCKeyFile .\account.json Removes a TXT record the specified site with the specified value using the specified Google Cloud service account. #> } function Save-DnsTxt { [CmdletBinding()] param( [Parameter(ValueFromRemainingArguments)] $ExtraParams ) <# .SYNOPSIS Not required. .DESCRIPTION This provider does not require calling this function to commit changes to DNS records. .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. #> } ############################ # Helper Functions ############################ function Connect-GCloudDns { [CmdletBinding()] param( [Parameter(Mandatory,Position=0)] [string]$GCKeyFile ) # Using OAuth 2.0 for Server to Server Applications # https://developers.google.com/identity/protocols/OAuth2ServiceAccount # just return if we've already got a valid non-expired token if ($script:GCToken -and (Get-DateTimeOffsetNow) -lt $script:GCToken.Expires) { return } Write-Verbose "Signing into GCloud DNS" # We want to cache the contents of GCKeyFile so renewals don't break if the original # file is moved/deleted. But we still want to primarily use the actual file by default # in case it has been updated. # expand the path to the file $GCKeyFile = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($GCKeyFile) # get the previously cached values $cachedFiles = Import-PluginVar 'GCKeyObj' if (-not $cachedFiles -or $cachedFiles -is [string]) { $cachedFiles = [pscustomobject]@{} } if (Test-Path $GCKeyFile -PathType Leaf) { Write-Debug "Using key file" $GCKeyObj = Get-Content $GCKeyFile -Raw | ConvertFrom-Json # add the contents to our cached files $b64Contents = $GCKeyObj | ConvertTo-Json -Compress | ConvertTo-Base64Url $cachedFiles | Add-Member $GCKeyFile $b64Contents -Force Export-PluginVar 'GCKeyObj' $cachedFiles } elseif ($GCKeyFile -in $cachedFiles.PSObject.Properties.Name) { Write-Warning "GCKeyFile not found at `"$GCKeyFile`". Attempting to use cached key data." $b64Contents = $cachedFiles.$GCKeyFile try { $GCKeyObj = $b64Contents | ConvertFrom-Base64Url | ConvertFrom-Json } catch { throw } } else { throw "GCKeyFile not found at `"$GCKeyFile`" and no cached data exists." } Write-Debug "Loading private key for $($GCKeyObj.client_email)" $key = Import-Pem -InputString $GCKeyObj.private_key | ConvertFrom-BCKey $unixNow = (Get-DateTimeOffsetNow).ToUnixTimeSeconds() # build the claim set for DNS read/write $jwtClaim = @{ iss = $GCKeyObj.client_email; aud = $GCKeyObj.token_uri; scope = 'https://www.googleapis.com/auth/ndev.clouddns.readwrite'; exp = ($unixNow + 3600).ToString(); iat = $unixNow.ToString(); } Write-Debug "Claim set: $($jwtClaim | ConvertTo-Json)" # build a signed jwt $header = @{alg='RS256';typ='JWT'} $jwt = New-Jws $key $header ($jwtClaim | ConvertTo-Json -Compress) -Compact -NoHeaderValidation # build the POST body $authBody = "assertion=$jwt&grant_type=$([uri]::EscapeDataString('urn:ietf:params:oauth:grant-type:jwt-bearer'))" # attempt to sign in try { Write-Debug "Sending OAuth2 login" $response = Invoke-RestMethod $GCKeyObj.token_uri -Method Post -Body $authBody @script:UseBasic Write-Debug ($response | ConvertTo-Json) } catch { throw } # save a custom token to memory $script:GCToken = @{ AuthHeader = @{Authorization="$($response.token_type) $($response.access_token)"}; Expires = (Get-DateTimeOffsetNow).AddSeconds($response.expires_in - 300); ProjectID = $GCKeyObj.project_id; } } function Find-GCZone { [CmdletBinding()] param( [Parameter(Mandatory,Position=0)] [string]$RecordName ) # setup a module variable to cache the record to zone mapping # so it's quicker to find later if (!$script:GCRecordZones) { $script:GCRecordZones = @{} } # check for the record in the cache if ($script:GCRecordZones.ContainsKey($RecordName)) { return $script:GCRecordZones.$RecordName } $token = $script:GCToken $projRoot = "https://www.googleapis.com/dns/v1beta2/projects/$($token.ProjectID)" # get the list of available zones try { $zones = (Invoke-RestMethod "$projRoot/managedZones" ` -Headers $script:GCToken.AuthHeader @script:UseBasic).managedZones | Where-Object {$_.visibility -eq "public"} } catch { throw } # Since Google 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.dnsName) { $zoneID = ($zones | Where-Object { $_.dnsName -eq $zoneTest }).id $script:GCRecordZones.$RecordName = $zoneID return $zoneID } } return $null } |