traefik/vendor/github.com/xenolf/lego/providers/dns/azure/azure.go
2018-10-10 16:28:04 +02:00

200 lines
6.5 KiB
Go

// Package azure implements a DNS provider for solving the DNS-01
// challenge using azure DNS.
// Azure doesn't like trailing dots on domain names, most of the acme code does.
package azure
import (
"context"
"errors"
"fmt"
"net/http"
"strings"
"time"
"github.com/Azure/azure-sdk-for-go/services/dns/mgmt/2017-09-01/dns"
"github.com/Azure/go-autorest/autorest"
"github.com/Azure/go-autorest/autorest/adal"
"github.com/Azure/go-autorest/autorest/azure"
"github.com/Azure/go-autorest/autorest/to"
"github.com/xenolf/lego/acme"
"github.com/xenolf/lego/platform/config/env"
)
// Config is used to configure the creation of the DNSProvider
type Config struct {
ClientID string
ClientSecret string
SubscriptionID string
TenantID string
ResourceGroup string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt("AZURE_TTL", 60),
PropagationTimeout: env.GetOrDefaultSecond("AZURE_PROPAGATION_TIMEOUT", 2*time.Minute),
PollingInterval: env.GetOrDefaultSecond("AZURE_POLLING_INTERVAL", 2*time.Second),
}
}
// DNSProvider is an implementation of the acme.ChallengeProvider interface
type DNSProvider struct {
config *Config
}
// NewDNSProvider returns a DNSProvider instance configured for azure.
// Credentials must be passed in the environment variables: AZURE_CLIENT_ID,
// AZURE_CLIENT_SECRET, AZURE_SUBSCRIPTION_ID, AZURE_TENANT_ID, AZURE_RESOURCE_GROUP
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("AZURE_CLIENT_ID", "AZURE_CLIENT_SECRET", "AZURE_SUBSCRIPTION_ID", "AZURE_TENANT_ID", "AZURE_RESOURCE_GROUP")
if err != nil {
return nil, fmt.Errorf("azure: %v", err)
}
config := NewDefaultConfig()
config.ClientID = values["AZURE_CLIENT_ID"]
config.ClientSecret = values["AZURE_CLIENT_SECRET"]
config.SubscriptionID = values["AZURE_SUBSCRIPTION_ID"]
config.TenantID = values["AZURE_TENANT_ID"]
config.ResourceGroup = values["AZURE_RESOURCE_GROUP"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderCredentials uses the supplied credentials
// to return a DNSProvider instance configured for azure.
// Deprecated
func NewDNSProviderCredentials(clientID, clientSecret, subscriptionID, tenantID, resourceGroup string) (*DNSProvider, error) {
config := NewDefaultConfig()
config.ClientID = clientID
config.ClientSecret = clientSecret
config.SubscriptionID = subscriptionID
config.TenantID = tenantID
config.ResourceGroup = resourceGroup
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Azure.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("azure: the configuration of the DNS provider is nil")
}
if config.ClientID == "" || config.ClientSecret == "" || config.SubscriptionID == "" || config.TenantID == "" || config.ResourceGroup == "" {
return nil, errors.New("azure: some credentials information are missing")
}
return &DNSProvider{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 {
ctx := context.Background()
fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
zone, err := d.getHostedZoneID(ctx, fqdn)
if err != nil {
return fmt.Errorf("azure: %v", err)
}
rsc := dns.NewRecordSetsClient(d.config.SubscriptionID)
spt, err := d.newServicePrincipalToken(azure.PublicCloud.ResourceManagerEndpoint)
if err != nil {
return fmt.Errorf("azure: %v", err)
}
rsc.Authorizer = autorest.NewBearerAuthorizer(spt)
relative := toRelativeRecord(fqdn, acme.ToFqdn(zone))
rec := dns.RecordSet{
Name: &relative,
RecordSetProperties: &dns.RecordSetProperties{
TTL: to.Int64Ptr(int64(d.config.TTL)),
TxtRecords: &[]dns.TxtRecord{{Value: &[]string{value}}},
},
}
_, err = rsc.CreateOrUpdate(ctx, d.config.ResourceGroup, zone, relative, dns.TXT, rec, "", "")
if err != nil {
return fmt.Errorf("azure: %v", err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
ctx := context.Background()
fqdn, _, _ := acme.DNS01Record(domain, keyAuth)
zone, err := d.getHostedZoneID(ctx, fqdn)
if err != nil {
return fmt.Errorf("azure: %v", err)
}
relative := toRelativeRecord(fqdn, acme.ToFqdn(zone))
rsc := dns.NewRecordSetsClient(d.config.SubscriptionID)
spt, err := d.newServicePrincipalToken(azure.PublicCloud.ResourceManagerEndpoint)
if err != nil {
return fmt.Errorf("azure: %v", err)
}
rsc.Authorizer = autorest.NewBearerAuthorizer(spt)
_, err = rsc.Delete(ctx, d.config.ResourceGroup, zone, relative, dns.TXT, "")
if err != nil {
return fmt.Errorf("azure: %v", err)
}
return nil
}
// Checks that azure has a zone for this domain name.
func (d *DNSProvider) getHostedZoneID(ctx context.Context, fqdn string) (string, error) {
authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
if err != nil {
return "", err
}
// Now we want to to Azure and get the zone.
spt, err := d.newServicePrincipalToken(azure.PublicCloud.ResourceManagerEndpoint)
if err != nil {
return "", err
}
dc := dns.NewZonesClient(d.config.SubscriptionID)
dc.Authorizer = autorest.NewBearerAuthorizer(spt)
zone, err := dc.Get(ctx, d.config.ResourceGroup, acme.UnFqdn(authZone))
if err != nil {
return "", err
}
// zone.Name shouldn't have a trailing dot(.)
return to.String(zone.Name), nil
}
// NewServicePrincipalTokenFromCredentials creates a new ServicePrincipalToken using values of the
// passed credentials map.
func (d *DNSProvider) newServicePrincipalToken(scope string) (*adal.ServicePrincipalToken, error) {
oauthConfig, err := adal.NewOAuthConfig(azure.PublicCloud.ActiveDirectoryEndpoint, d.config.TenantID)
if err != nil {
return nil, err
}
return adal.NewServicePrincipalToken(*oauthConfig, d.config.ClientID, d.config.ClientSecret, scope)
}
// Returns the relative record to the domain
func toRelativeRecord(domain, zone string) string {
return acme.UnFqdn(strings.TrimSuffix(domain, zone))
}