mirror of
https://github.com/go-acme/lego.git
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251 lines
7.7 KiB
Go
251 lines
7.7 KiB
Go
// Package azure implements a DNS provider for solving the DNS-01 challenge using azure DNS.
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// Azure doesn't like trailing dots on domain names, most of the acme code does.
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package azure
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import (
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"time"
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"github.com/Azure/go-autorest/autorest"
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aazure "github.com/Azure/go-autorest/autorest/azure"
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"github.com/Azure/go-autorest/autorest/azure/auth"
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"github.com/go-acme/lego/v4/challenge"
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"github.com/go-acme/lego/v4/platform/config/env"
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"github.com/go-acme/lego/v4/providers/dns/internal/errutils"
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)
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// Environment variables names.
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const (
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envNamespace = "AZURE_"
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EnvEnvironment = envNamespace + "ENVIRONMENT"
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EnvMetadataEndpoint = envNamespace + "METADATA_ENDPOINT"
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EnvSubscriptionID = envNamespace + "SUBSCRIPTION_ID"
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EnvResourceGroup = envNamespace + "RESOURCE_GROUP"
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EnvTenantID = envNamespace + "TENANT_ID"
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EnvClientID = envNamespace + "CLIENT_ID"
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EnvClientSecret = envNamespace + "CLIENT_SECRET"
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EnvZoneName = envNamespace + "ZONE_NAME"
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EnvPrivateZone = envNamespace + "PRIVATE_ZONE"
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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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const defaultMetadataEndpoint = "http://169.254.169.254"
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var _ challenge.ProviderTimeout = (*DNSProvider)(nil)
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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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ZoneName string
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// optional if using instance metadata service
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ClientID string
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ClientSecret string
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TenantID string
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SubscriptionID string
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ResourceGroup string
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PrivateZone bool
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MetadataEndpoint string
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ResourceManagerEndpoint string
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ActiveDirectoryEndpoint 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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HTTPClient *http.Client
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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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ZoneName: env.GetOrFile(EnvZoneName),
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TTL: env.GetOrDefaultInt(EnvTTL, 60),
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PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, 2*time.Minute),
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PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, 2*time.Second),
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MetadataEndpoint: env.GetOrFile(EnvMetadataEndpoint),
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ResourceManagerEndpoint: aazure.PublicCloud.ResourceManagerEndpoint,
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ActiveDirectoryEndpoint: aazure.PublicCloud.ActiveDirectoryEndpoint,
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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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provider challenge.ProviderTimeout
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}
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// NewDNSProvider returns a DNSProvider instance configured for azure.
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// Credentials can be passed in the environment variables:
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// AZURE_ENVIRONMENT, AZURE_CLIENT_ID, AZURE_CLIENT_SECRET,
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// AZURE_SUBSCRIPTION_ID, AZURE_TENANT_ID, AZURE_RESOURCE_GROUP
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// If the credentials are _not_ set via the environment,
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// then it will attempt to get a bearer token via the instance metadata service.
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// see: https://github.com/Azure/go-autorest/blob/v10.14.0/autorest/azure/auth/auth.go#L38-L42
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// Deprecated: use azuredns instead.
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func NewDNSProvider() (*DNSProvider, error) {
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config := NewDefaultConfig()
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environmentName := env.GetOrFile(EnvEnvironment)
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if environmentName != "" {
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var environment aazure.Environment
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switch environmentName {
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case "china":
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environment = aazure.ChinaCloud
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case "german":
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environment = aazure.GermanCloud
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case "public":
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environment = aazure.PublicCloud
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case "usgovernment":
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environment = aazure.USGovernmentCloud
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default:
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return nil, fmt.Errorf("azure: unknown environment %s", environmentName)
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}
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config.ResourceManagerEndpoint = environment.ResourceManagerEndpoint
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config.ActiveDirectoryEndpoint = environment.ActiveDirectoryEndpoint
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}
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config.SubscriptionID = env.GetOrFile(EnvSubscriptionID)
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config.ResourceGroup = env.GetOrFile(EnvResourceGroup)
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config.ClientSecret = env.GetOrFile(EnvClientSecret)
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config.ClientID = env.GetOrFile(EnvClientID)
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config.TenantID = env.GetOrFile(EnvTenantID)
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config.PrivateZone = env.GetOrDefaultBool(EnvPrivateZone, false)
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for Azure.
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// Deprecated: use azuredns instead.
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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("azure: the configuration of the DNS provider is nil")
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}
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if config.HTTPClient == nil {
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config.HTTPClient = &http.Client{Timeout: 5 * time.Second}
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}
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authorizer, err := getAuthorizer(config)
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if err != nil {
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return nil, err
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}
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if config.SubscriptionID == "" {
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subsID, err := getMetadata(config, "subscriptionId")
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if err != nil {
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return nil, fmt.Errorf("azure: %w", err)
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}
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if subsID == "" {
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return nil, errors.New("azure: SubscriptionID is missing")
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}
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config.SubscriptionID = subsID
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}
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if config.ResourceGroup == "" {
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resGroup, err := getMetadata(config, "resourceGroupName")
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if err != nil {
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return nil, fmt.Errorf("azure: %w", err)
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}
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if resGroup == "" {
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return nil, errors.New("azure: ResourceGroup is missing")
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}
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config.ResourceGroup = resGroup
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}
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if config.PrivateZone {
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return &DNSProvider{provider: &dnsProviderPrivate{config: config, authorizer: authorizer}}, nil
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}
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return &DNSProvider{provider: &dnsProviderPublic{config: config, authorizer: authorizer}}, 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 (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
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return d.provider.Timeout()
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}
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// Present creates a TXT record to fulfill the dns-01 challenge.
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func (d *DNSProvider) Present(domain, token, keyAuth string) error {
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return d.provider.Present(domain, token, keyAuth)
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}
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// CleanUp removes the TXT record matching the specified parameters.
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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return d.provider.CleanUp(domain, token, keyAuth)
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}
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func getAuthorizer(config *Config) (autorest.Authorizer, error) {
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if config.ClientID != "" && config.ClientSecret != "" && config.TenantID != "" {
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credentialsConfig := auth.ClientCredentialsConfig{
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ClientID: config.ClientID,
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ClientSecret: config.ClientSecret,
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TenantID: config.TenantID,
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Resource: config.ResourceManagerEndpoint,
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AADEndpoint: config.ActiveDirectoryEndpoint,
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}
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spToken, err := credentialsConfig.ServicePrincipalToken()
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if err != nil {
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return nil, fmt.Errorf("failed to get oauth token from client credentials: %w", err)
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}
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spToken.SetSender(config.HTTPClient)
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return autorest.NewBearerAuthorizer(spToken), nil
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}
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return auth.NewAuthorizerFromEnvironment()
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}
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// Fetches metadata from environment or the instance metadata service.
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// borrowed from https://github.com/Microsoft/azureimds/blob/master/imdssample.go
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func getMetadata(config *Config, field string) (string, error) {
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metadataEndpoint := config.MetadataEndpoint
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if metadataEndpoint == "" {
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metadataEndpoint = defaultMetadataEndpoint
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}
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endpoint, err := url.JoinPath(metadataEndpoint, "metadata", "instance", "compute", field)
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if err != nil {
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return "", err
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}
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req, err := http.NewRequest(http.MethodGet, endpoint, nil)
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if err != nil {
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return "", err
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}
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req.Header.Set("Metadata", "True")
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q := req.URL.Query()
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q.Add("format", "text")
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q.Add("api-version", "2017-12-01")
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req.URL.RawQuery = q.Encode()
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resp, err := config.HTTPClient.Do(req)
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if err != nil {
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return "", errutils.NewHTTPDoError(req, err)
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}
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defer func() { _ = resp.Body.Close() }()
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raw, err := io.ReadAll(resp.Body)
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if err != nil {
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return "", errutils.NewReadResponseError(req, resp.StatusCode, err)
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}
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return string(raw), nil
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}
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