mirror of
https://github.com/StackExchange/dnscontrol.git
synced 2024-09-20 14:56:20 +08:00
618 lines
20 KiB
Go
618 lines
20 KiB
Go
package azuredns
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import (
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"context"
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"encoding/json"
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"fmt"
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"strings"
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"time"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore"
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aauth "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
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adns "github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/dns/armdns"
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"github.com/Azure/go-autorest/autorest/to"
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"github.com/StackExchange/dnscontrol/v4/models"
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"github.com/StackExchange/dnscontrol/v4/pkg/diff2"
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"github.com/StackExchange/dnscontrol/v4/pkg/printer"
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"github.com/StackExchange/dnscontrol/v4/providers"
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)
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type azurednsProvider struct {
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zonesClient *adns.ZonesClient
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recordsClient *adns.RecordSetsClient
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zones map[string]*adns.Zone
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resourceGroup *string
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subscriptionID *string
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}
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func newAzureDNSDsp(conf map[string]string, metadata json.RawMessage) (providers.DNSServiceProvider, error) {
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return newAzureDNS(conf, metadata)
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}
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func newAzureDNS(m map[string]string, _ json.RawMessage) (*azurednsProvider, error) {
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subID, rg := m["SubscriptionID"], m["ResourceGroup"]
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clientID, clientSecret, tenantID := m["ClientID"], m["ClientSecret"], m["TenantID"]
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credential, authErr := aauth.NewClientSecretCredential(tenantID, clientID, clientSecret, nil)
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if authErr != nil {
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return nil, authErr
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}
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zonesClient, zoneErr := adns.NewZonesClient(subID, credential, nil)
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if zoneErr != nil {
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return nil, zoneErr
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}
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recordsClient, recordErr := adns.NewRecordSetsClient(subID, credential, nil)
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if recordErr != nil {
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return nil, recordErr
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}
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api := &azurednsProvider{
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zonesClient: zonesClient,
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recordsClient: recordsClient,
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resourceGroup: to.StringPtr(rg),
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subscriptionID: to.StringPtr(subID),
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}
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err := api.getZones()
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if err != nil {
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return nil, err
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}
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return api, nil
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}
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var features = providers.DocumentationNotes{
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// The default for unlisted capabilities is 'Cannot'.
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// See providers/capabilities.go for the entire list of capabilities.
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providers.CanGetZones: providers.Can(),
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providers.CanConcur: providers.Can(),
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providers.CanUseAlias: providers.Cannot("Azure DNS does not provide a generic ALIAS functionality. Use AZURE_ALIAS instead."),
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providers.CanUseAzureAlias: providers.Can(),
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providers.CanUseCAA: providers.Can(),
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providers.CanUseLOC: providers.Cannot(),
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providers.CanUseNAPTR: providers.Cannot(),
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providers.CanUsePTR: providers.Can(),
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providers.CanUseSRV: providers.Can(),
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providers.CanUseSSHFP: providers.Cannot(),
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providers.CanUseTLSA: providers.Cannot(),
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providers.DocCreateDomains: providers.Can(),
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providers.DocDualHost: providers.Can("Azure does not permit modifying the existing NS records, only adding/removing additional records."),
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providers.DocOfficiallySupported: providers.Can(),
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}
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func init() {
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const providerName = "AZURE_DNS"
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const providerMaintainer = "@vatsalyagoel"
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fns := providers.DspFuncs{
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Initializer: newAzureDNSDsp,
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RecordAuditor: AuditRecords,
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}
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providers.RegisterDomainServiceProviderType(providerName, fns, features)
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providers.RegisterCustomRecordType("AZURE_ALIAS", providerName, "")
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providers.RegisterMaintainer(providerName, providerMaintainer)
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}
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func (a *azurednsProvider) getExistingZones() ([]*adns.Zone, error) {
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ctx, cancel := context.WithTimeout(context.Background(), 6000*time.Second)
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defer cancel()
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zonesPager := a.zonesClient.NewListByResourceGroupPager(*a.resourceGroup, nil)
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var zones []*adns.Zone
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for zonesPager.More() {
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nextResult, zonesErr := zonesPager.NextPage(ctx)
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if zonesErr != nil {
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return nil, zonesErr
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}
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zones = append(zones, nextResult.Value...)
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}
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return zones, nil
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}
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func (a *azurednsProvider) getZones() error {
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a.zones = make(map[string]*adns.Zone)
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zones, err := a.getExistingZones()
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if err != nil {
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return err
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}
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for _, z := range zones {
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zone := z
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domain := strings.TrimSuffix(*z.Name, ".")
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a.zones[domain] = zone
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}
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return nil
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}
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type errNoExist struct {
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domain string
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}
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func (e errNoExist) Error() string {
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return fmt.Sprintf("Domain %s not found in you Azure account", e.domain)
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}
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func (a *azurednsProvider) GetNameservers(domain string) ([]*models.Nameserver, error) {
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zone, ok := a.zones[domain]
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if !ok {
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return nil, errNoExist{domain}
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}
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var nss []string
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if zone.Properties != nil {
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for _, ns := range zone.Properties.NameServers {
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nss = append(nss, *ns)
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}
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}
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return models.ToNameserversStripTD(nss)
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}
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func (a *azurednsProvider) ListZones() ([]string, error) {
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zonesResult, err := a.getExistingZones()
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if err != nil {
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return nil, err
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}
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var zones []string
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for _, z := range zonesResult {
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domain := strings.TrimSuffix(*z.Name, ".")
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zones = append(zones, domain)
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}
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return zones, nil
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}
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// GetZoneRecords gets the records of a zone and returns them in RecordConfig format.
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func (a *azurednsProvider) GetZoneRecords(domain string, meta map[string]string) (models.Records, error) {
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existingRecords, _, _, err := a.getExistingRecords(domain)
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if err != nil {
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return nil, err
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}
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return existingRecords, nil
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}
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func (a *azurednsProvider) getExistingRecords(domain string) (models.Records, []*adns.RecordSet, string, error) {
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zone, ok := a.zones[domain]
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if !ok {
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return nil, nil, "", errNoExist{domain}
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}
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zoneName := *zone.Name
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rawRecords, err := a.fetchRecordSets(zoneName)
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if err != nil {
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return nil, nil, "", err
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}
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var existingRecords models.Records
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for _, set := range rawRecords {
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existingRecords = append(existingRecords, nativeToRecords(set, zoneName)...)
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}
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return existingRecords, rawRecords, zoneName, nil
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}
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// GetZoneRecordsCorrections returns a list of corrections that will turn existing records into dc.Records.
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func (a *azurednsProvider) GetZoneRecordsCorrections(dc *models.DomainConfig, existingRecords models.Records) ([]*models.Correction, error) {
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var corrections []*models.Correction
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// Azure is a "ByRecordSet" API.
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changes, err := diff2.ByRecordSet(existingRecords, dc, nil)
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if err != nil {
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return nil, err
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}
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for _, change := range changes {
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// Copy all param values to local variables to avoid overwrites
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msgs := change.MsgsJoined
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dcn := dc.Name
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chaKey := change.Key
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switch change.Type {
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case diff2.REPORT:
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corrections = append(corrections, &models.Correction{Msg: change.MsgsJoined})
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case diff2.CHANGE, diff2.CREATE:
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changeNew := change.New
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corrections = append(corrections, &models.Correction{
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Msg: msgs,
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F: func() error {
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return a.recordCreate(dcn, chaKey, changeNew)
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},
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})
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case diff2.DELETE:
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corrections = append(corrections, &models.Correction{
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Msg: msgs,
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F: func() error {
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return a.recordDelete(dcn, chaKey)
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},
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})
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default:
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panic(fmt.Sprintf("unhandled change.Type %s", change.Type))
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}
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}
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return corrections, nil
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}
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func (a *azurednsProvider) recordCreate(zoneName string, reckey models.RecordKey, recs models.Records) error {
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rrset, azRecType, err := a.recordToNativeDiff2(reckey, recs)
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if err != nil {
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return err
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}
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var recordName string
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var i int64
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for _, r := range recs {
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i = int64(r.TTL)
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recordName = r.Name
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}
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rrset.Properties.TTL = &i
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waitTime := 1
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retry:
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ctx, cancel := context.WithTimeout(context.Background(), 6000*time.Second)
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defer cancel()
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_, err = a.recordsClient.CreateOrUpdate(ctx, *a.resourceGroup, zoneName, recordName, azRecType, *rrset, nil)
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if e, ok := err.(*azcore.ResponseError); ok {
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if e.StatusCode == 429 {
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waitTime = waitTime * 2
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if waitTime > 300 {
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return err
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}
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printer.Printf("AZURE_DNS: rate-limit paused for %v.\n", waitTime)
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time.Sleep(time.Duration(waitTime+1) * time.Second)
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goto retry
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}
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}
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return err
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}
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func (a *azurednsProvider) recordDelete(zoneName string, reckey models.RecordKey) error {
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shortName := strings.TrimSuffix(reckey.NameFQDN, "."+zoneName)
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if shortName == zoneName {
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shortName = "@"
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}
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azRecType, err := nativeToRecordTypeDiff2(to.StringPtr(reckey.Type))
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if err != nil {
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return nil
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}
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waitTime := 1
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retry:
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ctx, cancel := context.WithTimeout(context.Background(), 6000*time.Second)
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defer cancel()
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_, err = a.recordsClient.Delete(ctx, *a.resourceGroup, zoneName, shortName, azRecType, nil)
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if e, ok := err.(*azcore.ResponseError); ok {
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if e.StatusCode == 429 {
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waitTime = waitTime * 2
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if waitTime > 300 {
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return err
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}
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printer.Printf("AZURE_DNS: rate-limit paused for %v.\n", waitTime)
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time.Sleep(time.Duration(waitTime+1) * time.Second)
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goto retry
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}
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}
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return err
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}
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func nativeToRecordTypeDiff2(recordType *string) (adns.RecordType, error) {
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recordTypeStripped := strings.TrimPrefix(*recordType, "Microsoft.Network/dnszones/")
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switch recordTypeStripped {
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case "A", "AZURE_ALIAS_A":
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return adns.RecordTypeA, nil
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case "AAAA", "AZURE_ALIAS_AAAA":
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return adns.RecordTypeAAAA, nil
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case "CAA":
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return adns.RecordTypeCAA, nil
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case "CNAME", "AZURE_ALIAS_CNAME":
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return adns.RecordTypeCNAME, nil
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case "MX":
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return adns.RecordTypeMX, nil
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case "NS":
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return adns.RecordTypeNS, nil
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case "PTR":
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return adns.RecordTypePTR, nil
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case "SRV":
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return adns.RecordTypeSRV, nil
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case "TXT":
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return adns.RecordTypeTXT, nil
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case "SOA":
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return adns.RecordTypeSOA, nil
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default:
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// Unimplemented type. Return adns.A as a decoy, but send an error.
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return adns.RecordTypeA, fmt.Errorf("nativeToRecordTypeDiff2 RTYPE %v UNIMPLEMENTED", *recordType)
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}
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}
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func safeTarget(t *string) string {
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if t == nil {
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return "foundnil"
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}
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return *t
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}
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func nativeToRecords(set *adns.RecordSet, origin string) []*models.RecordConfig {
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var results []*models.RecordConfig
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switch rtype := *set.Type; rtype {
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case "Microsoft.Network/dnszones/A":
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if set.Properties.ARecords != nil {
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// This is an A recordset. Process all the targets there.
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for _, rec := range set.Properties.ARecords {
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "A"
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_ = rc.SetTarget(*rec.IPv4Address)
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results = append(results, rc)
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}
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} else {
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// This is an AZURE_ALIAS of an "A" record.
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rc := &models.RecordConfig{
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Type: "AZURE_ALIAS",
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TTL: uint32(*set.Properties.TTL),
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AzureAlias: map[string]string{
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"type": "A",
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},
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Original: set,
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}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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_ = rc.SetTarget(safeTarget(set.Properties.TargetResource.ID))
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results = append(results, rc)
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}
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case "Microsoft.Network/dnszones/AAAA":
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if set.Properties.AaaaRecords != nil {
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// This is an AAAA recordset. Process all the targets there.
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for _, rec := range set.Properties.AaaaRecords {
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "AAAA"
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_ = rc.SetTarget(*rec.IPv6Address)
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results = append(results, rc)
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}
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} else {
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// This is an AZURE_ALIAS of an "AAAA" record.
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rc := &models.RecordConfig{
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Type: "AZURE_ALIAS",
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TTL: uint32(*set.Properties.TTL),
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AzureAlias: map[string]string{
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"type": "AAAA",
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},
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Original: set,
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}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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_ = rc.SetTarget(safeTarget(set.Properties.TargetResource.ID))
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results = append(results, rc)
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}
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case "Microsoft.Network/dnszones/CNAME":
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if set.Properties.CnameRecord != nil {
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// This is a CNAME recordset. Process the targets. (there can only be one)
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "CNAME"
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_ = rc.SetTarget(*set.Properties.CnameRecord.Cname)
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results = append(results, rc)
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} else {
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// This is an AZURE_ALIAS of a "CNAME" record.
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rc := &models.RecordConfig{
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Type: "AZURE_ALIAS",
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TTL: uint32(*set.Properties.TTL),
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AzureAlias: map[string]string{
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"type": "CNAME",
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},
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Original: set,
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}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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_ = rc.SetTarget(safeTarget(set.Properties.TargetResource.ID))
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results = append(results, rc)
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}
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case "Microsoft.Network/dnszones/NS":
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for _, rec := range set.Properties.NsRecords {
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "NS"
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_ = rc.SetTarget(*rec.Nsdname)
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results = append(results, rc)
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}
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case "Microsoft.Network/dnszones/PTR":
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for _, rec := range set.Properties.PtrRecords {
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "PTR"
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_ = rc.SetTarget(*rec.Ptrdname)
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results = append(results, rc)
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}
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case "Microsoft.Network/dnszones/TXT":
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if len(set.Properties.TxtRecords) == 0 { // Empty String Record Parsing
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// This is a null TXT record.
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "TXT"
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_ = rc.SetTargetTXT("")
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results = append(results, rc)
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} else {
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// This is a normal TXT record. Collect all its segments.
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for _, rec := range set.Properties.TxtRecords {
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "TXT"
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var txts []string
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for _, txt := range rec.Value {
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txts = append(txts, *txt)
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}
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_ = rc.SetTargetTXTs(txts)
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results = append(results, rc)
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}
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}
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case "Microsoft.Network/dnszones/MX":
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for _, rec := range set.Properties.MxRecords {
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "MX"
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_ = rc.SetTargetMX(uint16(*rec.Preference), *rec.Exchange)
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results = append(results, rc)
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}
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case "Microsoft.Network/dnszones/SRV":
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for _, rec := range set.Properties.SrvRecords {
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "SRV"
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_ = rc.SetTargetSRV(uint16(*rec.Priority), uint16(*rec.Weight), uint16(*rec.Port), *rec.Target)
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results = append(results, rc)
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}
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case "Microsoft.Network/dnszones/CAA":
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for _, rec := range set.Properties.CaaRecords {
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rc := &models.RecordConfig{TTL: uint32(*set.Properties.TTL), Original: set}
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rc.SetLabelFromFQDN(*set.Properties.Fqdn, origin)
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rc.Type = "CAA"
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_ = rc.SetTargetCAA(uint8(*rec.Flags), *rec.Tag, *rec.Value)
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results = append(results, rc)
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}
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case "Microsoft.Network/dnszones/SOA":
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default:
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panic(fmt.Errorf("nativeToRecords rtype %v unimplemented", *set.Type))
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}
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return results
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}
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// NOTE recordToNativeDiff2 is really "convert []RecordConfig to rrset".
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|
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func (a *azurednsProvider) recordToNativeDiff2(recordKey models.RecordKey, recordConfig []*models.RecordConfig) (*adns.RecordSet, adns.RecordType, error) {
|
|
|
|
recordKeyType := recordKey.Type
|
|
// if recordKeyType == "AZURE_ALIAS" {
|
|
// fmt.Fprintf(os.Stderr, "DEBUG: XXXXXXXXXXXXXXXXXXXXXXX %v\n", recordKeyType)
|
|
// }
|
|
|
|
recordSet := &adns.RecordSet{Type: to.StringPtr(recordKeyType), Properties: &adns.RecordSetProperties{}}
|
|
for _, rec := range recordConfig {
|
|
switch recordKeyType {
|
|
case "A":
|
|
if recordSet.Properties.ARecords == nil {
|
|
recordSet.Properties.ARecords = []*adns.ARecord{}
|
|
}
|
|
recordSet.Properties.ARecords = append(recordSet.Properties.ARecords, &adns.ARecord{IPv4Address: to.StringPtr(rec.GetTargetField())})
|
|
case "AAAA":
|
|
if recordSet.Properties.AaaaRecords == nil {
|
|
recordSet.Properties.AaaaRecords = []*adns.AaaaRecord{}
|
|
}
|
|
recordSet.Properties.AaaaRecords = append(recordSet.Properties.AaaaRecords, &adns.AaaaRecord{IPv6Address: to.StringPtr(rec.GetTargetField())})
|
|
case "CNAME":
|
|
recordSet.Properties.CnameRecord = &adns.CnameRecord{Cname: to.StringPtr(rec.GetTargetField())}
|
|
case "NS":
|
|
if recordSet.Properties.NsRecords == nil {
|
|
recordSet.Properties.NsRecords = []*adns.NsRecord{}
|
|
}
|
|
recordSet.Properties.NsRecords = append(recordSet.Properties.NsRecords, &adns.NsRecord{Nsdname: to.StringPtr(rec.GetTargetField())})
|
|
case "PTR":
|
|
if recordSet.Properties.PtrRecords == nil {
|
|
recordSet.Properties.PtrRecords = []*adns.PtrRecord{}
|
|
}
|
|
recordSet.Properties.PtrRecords = append(recordSet.Properties.PtrRecords, &adns.PtrRecord{Ptrdname: to.StringPtr(rec.GetTargetField())})
|
|
case "TXT":
|
|
if recordSet.Properties.TxtRecords == nil {
|
|
recordSet.Properties.TxtRecords = []*adns.TxtRecord{}
|
|
}
|
|
// Empty TXT record needs to have no value set in it's properties
|
|
if !(rec.GetTargetTXTSegmentCount() == 1 && rec.GetTargetTXTSegmented()[0] == "") {
|
|
var txts []*string
|
|
for _, txt := range rec.GetTargetTXTSegmented() {
|
|
txts = append(txts, to.StringPtr(txt))
|
|
}
|
|
recordSet.Properties.TxtRecords = append(recordSet.Properties.TxtRecords, &adns.TxtRecord{Value: txts})
|
|
}
|
|
case "MX":
|
|
if recordSet.Properties.MxRecords == nil {
|
|
recordSet.Properties.MxRecords = []*adns.MxRecord{}
|
|
}
|
|
recordSet.Properties.MxRecords = append(recordSet.Properties.MxRecords, &adns.MxRecord{Exchange: to.StringPtr(rec.GetTargetField()), Preference: to.Int32Ptr(int32(rec.MxPreference))})
|
|
case "SRV":
|
|
if recordSet.Properties.SrvRecords == nil {
|
|
recordSet.Properties.SrvRecords = []*adns.SrvRecord{}
|
|
}
|
|
recordSet.Properties.SrvRecords = append(recordSet.Properties.SrvRecords, &adns.SrvRecord{Target: to.StringPtr(rec.GetTargetField()), Port: to.Int32Ptr(int32(rec.SrvPort)), Weight: to.Int32Ptr(int32(rec.SrvWeight)), Priority: to.Int32Ptr(int32(rec.SrvPriority))})
|
|
case "CAA":
|
|
if recordSet.Properties.CaaRecords == nil {
|
|
recordSet.Properties.CaaRecords = []*adns.CaaRecord{}
|
|
}
|
|
recordSet.Properties.CaaRecords = append(recordSet.Properties.CaaRecords, &adns.CaaRecord{Value: to.StringPtr(rec.GetTargetField()), Tag: to.StringPtr(rec.CaaTag), Flags: to.Int32Ptr(int32(rec.CaaFlag))})
|
|
case "AZURE_ALIAS_A", "AZURE_ALIAS_AAAA", "AZURE_ALIAS_CNAME":
|
|
aatype := rec.AzureAlias["type"]
|
|
recordSet.Type = &aatype
|
|
aatarg := to.StringPtr(rec.GetTargetField())
|
|
aasub := adns.SubResource{ID: aatarg}
|
|
recordSet.Properties.TargetResource = &aasub
|
|
|
|
default:
|
|
return nil, adns.RecordTypeA, fmt.Errorf("recordToNativeDiff2 RTYPE %v UNIMPLEMENTED", recordKeyType) // ands.A is a placeholder
|
|
}
|
|
}
|
|
|
|
rt, err := nativeToRecordTypeDiff2(to.StringPtr(*recordSet.Type))
|
|
if err != nil {
|
|
return nil, adns.RecordTypeA, err // adns.A is a placeholder
|
|
}
|
|
return recordSet, rt, nil
|
|
}
|
|
|
|
func (a *azurednsProvider) fetchRecordSets(zoneName string) ([]*adns.RecordSet, error) {
|
|
if zoneName == "" {
|
|
return nil, nil
|
|
}
|
|
var records []*adns.RecordSet
|
|
ctx, cancel := context.WithTimeout(context.Background(), 6000*time.Second)
|
|
defer cancel()
|
|
recordsPager := a.recordsClient.NewListAllByDNSZonePager(*a.resourceGroup, zoneName, nil)
|
|
|
|
for recordsPager.More() {
|
|
|
|
waitTime := 1
|
|
retry:
|
|
|
|
nextResult, recordsErr := recordsPager.NextPage(ctx)
|
|
|
|
if recordsErr != nil {
|
|
err := recordsErr
|
|
if e, ok := err.(*azcore.ResponseError); ok {
|
|
|
|
if e.StatusCode == 429 {
|
|
waitTime = waitTime * 2
|
|
if waitTime > 300 {
|
|
return nil, err
|
|
}
|
|
printer.Printf("AZURE_DNS: rate-limit paused for %v.\n", waitTime)
|
|
time.Sleep(time.Duration(waitTime+1) * time.Second)
|
|
goto retry
|
|
}
|
|
}
|
|
}
|
|
|
|
records = append(records, nextResult.Value...)
|
|
}
|
|
|
|
return records, nil
|
|
}
|
|
|
|
func (a *azurednsProvider) EnsureZoneExists(domain string) error {
|
|
if _, ok := a.zones[domain]; ok {
|
|
return nil
|
|
}
|
|
printer.Printf("Adding zone for %s to Azure dns account\n", domain)
|
|
|
|
ctx, cancel := context.WithTimeout(context.Background(), 6000*time.Second)
|
|
defer cancel()
|
|
|
|
_, err := a.zonesClient.CreateOrUpdate(ctx, *a.resourceGroup, domain, adns.Zone{Location: to.StringPtr("global")}, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|