2017-02-07 21:33:23 +00:00
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// Package route53 implements a DNS provider for solving the DNS-01 challenge
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// using AWS Route 53 DNS.
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package route53
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import (
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"fmt"
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"math/rand"
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2017-10-31 09:42:03 +00:00
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"os"
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2017-02-07 21:33:23 +00:00
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"strings"
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"time"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/client"
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"github.com/aws/aws-sdk-go/aws/request"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/route53"
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"github.com/xenolf/lego/acme"
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)
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const (
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maxRetries = 5
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route53TTL = 10
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)
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// DNSProvider implements the acme.ChallengeProvider interface
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type DNSProvider struct {
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client *route53.Route53
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hostedZoneID string
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2017-02-07 21:33:23 +00:00
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}
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// customRetryer implements the client.Retryer interface by composing the
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// DefaultRetryer. It controls the logic for retrying recoverable request
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// errors (e.g. when rate limits are exceeded).
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type customRetryer struct {
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client.DefaultRetryer
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}
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// RetryRules overwrites the DefaultRetryer's method.
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// It uses a basic exponential backoff algorithm that returns an initial
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// delay of ~400ms with an upper limit of ~30 seconds which should prevent
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// causing a high number of consecutive throttling errors.
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// For reference: Route 53 enforces an account-wide(!) 5req/s query limit.
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func (d customRetryer) RetryRules(r *request.Request) time.Duration {
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retryCount := r.RetryCount
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if retryCount > 7 {
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retryCount = 7
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}
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delay := (1 << uint(retryCount)) * (rand.Intn(50) + 200)
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return time.Duration(delay) * time.Millisecond
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}
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// NewDNSProvider returns a DNSProvider instance configured for the AWS
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// Route 53 service.
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//
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// AWS Credentials are automatically detected in the following locations
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// and prioritized in the following order:
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// 1. Environment variables: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY,
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// AWS_REGION, [AWS_SESSION_TOKEN]
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// 2. Shared credentials file (defaults to ~/.aws/credentials)
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// 3. Amazon EC2 IAM role
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//
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// If AWS_HOSTED_ZONE_ID is not set, Lego tries to determine the correct
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// public hosted zone via the FQDN.
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//
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// See also: https://github.com/aws/aws-sdk-go/wiki/configuring-sdk
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func NewDNSProvider() (*DNSProvider, error) {
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hostedZoneID := os.Getenv("AWS_HOSTED_ZONE_ID")
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2017-02-07 21:33:23 +00:00
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r := customRetryer{}
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r.NumMaxRetries = maxRetries
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config := request.WithRetryer(aws.NewConfig(), r)
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client := route53.New(session.New(config))
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2017-10-31 09:42:03 +00:00
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return &DNSProvider{
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client: client,
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hostedZoneID: hostedZoneID,
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}, nil
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2017-02-07 21:33:23 +00:00
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}
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// Present creates a TXT record using the specified parameters
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func (r *DNSProvider) Present(domain, token, keyAuth string) error {
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fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
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value = `"` + value + `"`
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return r.changeRecord("UPSERT", fqdn, value, route53TTL)
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}
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// CleanUp removes the TXT record matching the specified parameters
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func (r *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
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value = `"` + value + `"`
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return r.changeRecord("DELETE", fqdn, value, route53TTL)
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}
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func (r *DNSProvider) changeRecord(action, fqdn, value string, ttl int) error {
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hostedZoneID, err := r.getHostedZoneID(fqdn)
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if err != nil {
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return fmt.Errorf("Failed to determine Route 53 hosted zone ID: %v", err)
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}
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recordSet := newTXTRecordSet(fqdn, value, ttl)
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reqParams := &route53.ChangeResourceRecordSetsInput{
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HostedZoneId: aws.String(hostedZoneID),
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ChangeBatch: &route53.ChangeBatch{
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Comment: aws.String("Managed by Lego"),
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Changes: []*route53.Change{
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{
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Action: aws.String(action),
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ResourceRecordSet: recordSet,
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},
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},
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},
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}
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resp, err := r.client.ChangeResourceRecordSets(reqParams)
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if err != nil {
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return fmt.Errorf("Failed to change Route 53 record set: %v", err)
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}
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statusID := resp.ChangeInfo.Id
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return acme.WaitFor(120*time.Second, 4*time.Second, func() (bool, error) {
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reqParams := &route53.GetChangeInput{
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Id: statusID,
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}
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resp, err := r.client.GetChange(reqParams)
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if err != nil {
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return false, fmt.Errorf("Failed to query Route 53 change status: %v", err)
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}
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if *resp.ChangeInfo.Status == route53.ChangeStatusInsync {
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return true, nil
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}
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return false, nil
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})
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}
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2017-10-31 09:42:03 +00:00
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func (r *DNSProvider) getHostedZoneID(fqdn string) (string, error) {
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if r.hostedZoneID != "" {
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return r.hostedZoneID, nil
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}
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2017-02-07 21:33:23 +00:00
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authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
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if err != nil {
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return "", err
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}
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// .DNSName should not have a trailing dot
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reqParams := &route53.ListHostedZonesByNameInput{
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DNSName: aws.String(acme.UnFqdn(authZone)),
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}
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resp, err := r.client.ListHostedZonesByName(reqParams)
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if err != nil {
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return "", err
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}
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var hostedZoneID string
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for _, hostedZone := range resp.HostedZones {
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// .Name has a trailing dot
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if !*hostedZone.Config.PrivateZone && *hostedZone.Name == authZone {
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hostedZoneID = *hostedZone.Id
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break
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}
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}
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if len(hostedZoneID) == 0 {
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return "", fmt.Errorf("Zone %s not found in Route 53 for domain %s", authZone, fqdn)
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}
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if strings.HasPrefix(hostedZoneID, "/hostedzone/") {
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hostedZoneID = strings.TrimPrefix(hostedZoneID, "/hostedzone/")
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}
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return hostedZoneID, nil
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}
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func newTXTRecordSet(fqdn, value string, ttl int) *route53.ResourceRecordSet {
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return &route53.ResourceRecordSet{
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Name: aws.String(fqdn),
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Type: aws.String("TXT"),
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TTL: aws.Int64(int64(ttl)),
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ResourceRecords: []*route53.ResourceRecord{
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{Value: aws.String(value)},
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},
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}
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}
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