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