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lego/providers/dns/yandexcloud/yandexcloud.go
2024-11-15 23:21:21 +01:00

324 lines
7.9 KiB
Go

// Package yandexcloud implements a DNS provider for solving the DNS-01 challenge using Yandex Cloud.
package yandexcloud
import (
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"slices"
"strings"
"time"
"github.com/go-acme/lego/v4/challenge"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/platform/config/env"
ycdns "github.com/yandex-cloud/go-genproto/yandex/cloud/dns/v1"
ycsdk "github.com/yandex-cloud/go-sdk"
"github.com/yandex-cloud/go-sdk/iamkey"
)
// Environment variables names.
const (
envNamespace = "YANDEX_CLOUD_"
EnvIamToken = envNamespace + "IAM_TOKEN"
EnvFolderID = envNamespace + "FOLDER_ID"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
)
var _ challenge.ProviderTimeout = (*DNSProvider)(nil)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
IamToken string
FolderID string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
}
// NewDefaultConfig returns a default configuration for the DNSProvider.
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt(EnvTTL, 60),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
client *ycsdk.SDK
config *Config
}
// NewDNSProvider returns a DNSProvider instance configured for Yandex Cloud.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvIamToken, EnvFolderID)
if err != nil {
return nil, fmt.Errorf("yandexcloud: %w", err)
}
config := NewDefaultConfig()
config.IamToken = values[EnvIamToken]
config.FolderID = values[EnvFolderID]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Yandex Cloud.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("yandexcloud: the configuration of the DNS provider is nil")
}
if config.IamToken == "" {
return nil, errors.New("yandexcloud: some credentials information are missing IAM token")
}
if config.FolderID == "" {
return nil, errors.New("yandexcloud: some credentials information are missing folder id")
}
creds, err := decodeCredentials(config.IamToken)
if err != nil {
return nil, fmt.Errorf("yandexcloud: iam token is malformed: %w", err)
}
client, err := ycsdk.Build(context.Background(), ycsdk.Config{Credentials: creds})
if err != nil {
return nil, errors.New("yandexcloud: unable to build yandex cloud sdk")
}
return &DNSProvider{
client: client,
config: config,
}, nil
}
// Present creates a TXT record to fulfill the dns-01 challenge.
func (r *DNSProvider) Present(domain, _, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(info.EffectiveFQDN)
if err != nil {
return fmt.Errorf("yandexcloud: could not find zone for domain %q: %w", domain, err)
}
ctx := context.Background()
zones, err := r.getZones(ctx)
if err != nil {
return fmt.Errorf("yandexcloud: %w", err)
}
var zoneID string
for _, zone := range zones {
if zone.GetZone() == authZone {
zoneID = zone.GetId()
}
}
if zoneID == "" {
return fmt.Errorf("yandexcloud: cant find dns zone %s in yandex cloud", authZone)
}
subDomain, err := dns01.ExtractSubDomain(info.EffectiveFQDN, authZone)
if err != nil {
return fmt.Errorf("yandexcloud: %w", err)
}
err = r.upsertRecordSetData(ctx, zoneID, subDomain, info.Value)
if err != nil {
return fmt.Errorf("yandexcloud: %w", err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters.
func (r *DNSProvider) CleanUp(domain, _, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(info.EffectiveFQDN)
if err != nil {
return fmt.Errorf("yandexcloud: could not find zone for domain %q: %w", domain, err)
}
ctx := context.Background()
zones, err := r.getZones(ctx)
if err != nil {
return fmt.Errorf("yandexcloud: %w", err)
}
var zoneID string
for _, zone := range zones {
if zone.GetZone() == authZone {
zoneID = zone.GetId()
}
}
if zoneID == "" {
return nil
}
subDomain, err := dns01.ExtractSubDomain(info.EffectiveFQDN, authZone)
if err != nil {
return fmt.Errorf("yandexcloud: %w", err)
}
err = r.removeRecordSetData(ctx, zoneID, subDomain, info.Value)
if err != nil {
return fmt.Errorf("yandexcloud: %w", err)
}
return nil
}
// Timeout returns the timeout and interval to use when checking for DNS propagation.
// Adjusting here to cope with spikes in propagation times.
func (r *DNSProvider) Timeout() (timeout, interval time.Duration) {
return r.config.PropagationTimeout, r.config.PollingInterval
}
// getZones retrieves available zones from yandex cloud.
func (r *DNSProvider) getZones(ctx context.Context) ([]*ycdns.DnsZone, error) {
list := &ycdns.ListDnsZonesRequest{
FolderId: r.config.FolderID,
}
response, err := r.client.DNS().DnsZone().List(ctx, list)
if err != nil {
return nil, errors.New("unable to fetch dns zones")
}
return response.GetDnsZones(), nil
}
func (r *DNSProvider) upsertRecordSetData(ctx context.Context, zoneID, name, value string) error {
get := &ycdns.GetDnsZoneRecordSetRequest{
DnsZoneId: zoneID,
Name: name,
Type: "TXT",
}
exist, err := r.client.DNS().DnsZone().GetRecordSet(ctx, get)
if err != nil {
if !strings.Contains(err.Error(), "RecordSet not found") {
return err
}
}
record := &ycdns.RecordSet{
Name: name,
Type: "TXT",
Ttl: int64(r.config.TTL),
Data: []string{},
}
var deletions []*ycdns.RecordSet
if exist != nil {
record.SetData(append(record.GetData(), exist.GetData()...))
deletions = append(deletions, exist)
}
appended := appendRecordSetData(record, value)
if !appended {
// The value already present in RecordSet, nothing to do
return nil
}
update := &ycdns.UpdateRecordSetsRequest{
DnsZoneId: zoneID,
Deletions: deletions,
Additions: []*ycdns.RecordSet{record},
}
_, err = r.client.DNS().DnsZone().UpdateRecordSets(ctx, update)
return err
}
func (r *DNSProvider) removeRecordSetData(ctx context.Context, zoneID, name, value string) error {
get := &ycdns.GetDnsZoneRecordSetRequest{
DnsZoneId: zoneID,
Name: name,
Type: "TXT",
}
previousRecord, err := r.client.DNS().DnsZone().GetRecordSet(ctx, get)
if err != nil {
if strings.Contains(err.Error(), "RecordSet not found") {
// RecordSet is not present, nothing to do
return nil
}
return err
}
var additions []*ycdns.RecordSet
if len(previousRecord.GetData()) > 1 {
// RecordSet is not empty we should update it
record := &ycdns.RecordSet{
Name: name,
Type: "TXT",
Ttl: int64(r.config.TTL),
Data: []string{},
}
for _, data := range previousRecord.GetData() {
if data != value {
record.SetData(append(record.GetData(), data))
}
}
additions = append(additions, record)
}
update := &ycdns.UpdateRecordSetsRequest{
DnsZoneId: zoneID,
Deletions: []*ycdns.RecordSet{previousRecord},
Additions: additions,
}
_, err = r.client.DNS().DnsZone().UpdateRecordSets(ctx, update)
return err
}
// decodeCredentials converts base64 encoded json of iam token to struct.
func decodeCredentials(accountB64 string) (ycsdk.Credentials, error) {
account, err := base64.StdEncoding.DecodeString(accountB64)
if err != nil {
return nil, err
}
key := &iamkey.Key{}
err = json.Unmarshal(account, key)
if err != nil {
return nil, err
}
return ycsdk.ServiceAccountKey(key)
}
func appendRecordSetData(record *ycdns.RecordSet, value string) bool {
if slices.Contains(record.GetData(), value) {
return false
}
record.SetData(append(record.GetData(), value))
return true
}