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designate.go
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designate.go
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// Package designate implements a DNS provider for solving the DNS-01 challenge using the Designate DNSaaS for Openstack.
package designate
import (
"errors"
"fmt"
"log"
"os"
"sync"
"time"
"github.com/go-acme/lego/challenge/dns01"
"github.com/go-acme/lego/platform/config/env"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack"
"github.com/gophercloud/gophercloud/openstack/dns/v2/recordsets"
"github.com/gophercloud/gophercloud/openstack/dns/v2/zones"
)
// Config is used to configure the creation of the DNSProvider
type Config struct {
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
opts gophercloud.AuthOptions
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt("DESIGNATE_TTL", 10),
PropagationTimeout: env.GetOrDefaultSecond("DESIGNATE_PROPAGATION_TIMEOUT", 10*time.Minute),
PollingInterval: env.GetOrDefaultSecond("DESIGNATE_POLLING_INTERVAL", 10*time.Second),
}
}
// DNSProvider describes a provider for Designate
type DNSProvider struct {
config *Config
client *gophercloud.ServiceClient
dnsEntriesMu sync.Mutex
}
// NewDNSProvider returns a DNSProvider instance configured for Designate.
// Credentials must be passed in the environment variables:
// OS_AUTH_URL, OS_USERNAME, OS_PASSWORD, OS_TENANT_NAME, OS_REGION_NAME.
func NewDNSProvider() (*DNSProvider, error) {
_, err := env.Get("OS_AUTH_URL", "OS_USERNAME", "OS_PASSWORD", "OS_TENANT_NAME", "OS_REGION_NAME")
if err != nil {
return nil, fmt.Errorf("designate: %v", err)
}
opts, err := openstack.AuthOptionsFromEnv()
if err != nil {
return nil, fmt.Errorf("designate: %v", err)
}
config := NewDefaultConfig()
config.opts = opts
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Designate.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("designate: the configuration of the DNS provider is nil")
}
provider, err := openstack.AuthenticatedClient(config.opts)
if err != nil {
return nil, fmt.Errorf("designate: failed to authenticate: %v", err)
}
dnsClient, err := openstack.NewDNSV2(provider, gophercloud.EndpointOpts{
Region: os.Getenv("OS_REGION_NAME"),
})
if err != nil {
return nil, fmt.Errorf("designate: failed to get DNS provider: %v", err)
}
return &DNSProvider{client: dnsClient, config: config}, nil
}
// Timeout returns the timeout and interval to use when checking for DNS propagation.
// Adjusting here to cope with spikes in propagation times.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
}
// Present creates a TXT record to fulfill the dns-01 challenge
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return fmt.Errorf("designate: couldn't get zone ID in Present: %v", err)
}
zoneID, err := d.getZoneID(authZone)
if err != nil {
return fmt.Errorf("designate: %v", err)
}
// use mutex to prevent race condition between creating the record and verifying it
d.dnsEntriesMu.Lock()
defer d.dnsEntriesMu.Unlock()
existingRecord, err := d.getRecord(zoneID, fqdn)
if err != nil {
return fmt.Errorf("designate: %v", err)
}
if existingRecord != nil {
if contains(existingRecord.Records, value) {
log.Printf("designate: the record already exists: %s", value)
return nil
}
return d.updateRecord(existingRecord, value)
}
err = d.createRecord(zoneID, fqdn, value)
if err != nil {
return fmt.Errorf("designate: %v", err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _ := dns01.GetRecord(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return err
}
zoneID, err := d.getZoneID(authZone)
if err != nil {
return fmt.Errorf("designate: couldn't get zone ID in CleanUp: %v", err)
}
// use mutex to prevent race condition between getting the record and deleting it
d.dnsEntriesMu.Lock()
defer d.dnsEntriesMu.Unlock()
record, err := d.getRecord(zoneID, fqdn)
if err != nil {
return fmt.Errorf("designate: couldn't get Record ID in CleanUp: %v", err)
}
if record == nil {
// Record is already deleted
return nil
}
err = recordsets.Delete(d.client, zoneID, record.ID).ExtractErr()
if err != nil {
return fmt.Errorf("designate: error for %s in CleanUp: %v", fqdn, err)
}
return nil
}
func contains(values []string, value string) bool {
for _, v := range values {
if v == value {
return true
}
}
return false
}
func (d *DNSProvider) createRecord(zoneID, fqdn, value string) error {
createOpts := recordsets.CreateOpts{
Name: fqdn,
Type: "TXT",
TTL: d.config.TTL,
Description: "ACME verification record",
Records: []string{value},
}
actual, err := recordsets.Create(d.client, zoneID, createOpts).Extract()
if err != nil {
return fmt.Errorf("error for %s in Present while creating record: %v", fqdn, err)
}
if actual.Name != fqdn || actual.TTL != d.config.TTL {
return fmt.Errorf("the created record doesn't match what we wanted to create")
}
return nil
}
func (d *DNSProvider) updateRecord(record *recordsets.RecordSet, value string) error {
if contains(record.Records, value) {
log.Printf("skip: the record already exists: %s", value)
return nil
}
values := append([]string{value}, record.Records...)
updateOpts := recordsets.UpdateOpts{
Description: &record.Description,
TTL: record.TTL,
Records: values,
}
result := recordsets.Update(d.client, record.ZoneID, record.ID, updateOpts)
return result.Err
}
func (d *DNSProvider) getZoneID(wanted string) (string, error) {
allPages, err := zones.List(d.client, nil).AllPages()
if err != nil {
return "", err
}
allZones, err := zones.ExtractZones(allPages)
if err != nil {
return "", err
}
for _, zone := range allZones {
if zone.Name == wanted {
return zone.ID, nil
}
}
return "", fmt.Errorf("zone id not found for %s", wanted)
}
func (d *DNSProvider) getRecord(zoneID string, wanted string) (*recordsets.RecordSet, error) {
allPages, err := recordsets.ListByZone(d.client, zoneID, nil).AllPages()
if err != nil {
return nil, err
}
allRecords, err := recordsets.ExtractRecordSets(allPages)
if err != nil {
return nil, err
}
for _, record := range allRecords {
if record.Name == wanted {
return &record, nil
}
}
return nil, nil
}