forked from TrueCloudLab/lego
264 lines
8.1 KiB
Go
264 lines
8.1 KiB
Go
// Package azuredns 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 azuredns
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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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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"github.com/Azure/azure-sdk-for-go/sdk/azcore/cloud"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
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"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
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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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)
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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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EnvSubscriptionID = envNamespace + "SUBSCRIPTION_ID"
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EnvResourceGroup = envNamespace + "RESOURCE_GROUP"
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EnvZoneName = envNamespace + "ZONE_NAME"
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EnvPrivateZone = envNamespace + "PRIVATE_ZONE"
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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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EnvOIDCToken = envNamespace + "OIDC_TOKEN"
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EnvOIDCTokenFilePath = envNamespace + "OIDC_TOKEN_FILE_PATH"
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EnvOIDCRequestURL = envNamespace + "OIDC_REQUEST_URL"
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EnvOIDCRequestToken = envNamespace + "OIDC_REQUEST_TOKEN"
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EnvAuthMethod = envNamespace + "AUTH_METHOD"
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EnvAuthMSITimeout = envNamespace + "AUTH_MSI_TIMEOUT"
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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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EnvGitHubOIDCRequestURL = "ACTIONS_ID_TOKEN_REQUEST_URL"
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EnvGitHubOIDCRequestToken = "ACTIONS_ID_TOKEN_REQUEST_TOKEN"
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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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SubscriptionID string
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ResourceGroup string
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PrivateZone bool
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Environment cloud.Configuration
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// optional if using default Azure credentials
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ClientID string
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ClientSecret string
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TenantID string
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OIDCToken string
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OIDCTokenFilePath string
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OIDCRequestURL string
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OIDCRequestToken string
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AuthMethod string
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AuthMSITimeout time.Duration
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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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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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Environment: cloud.AzurePublic,
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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 azuredns.
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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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switch environmentName {
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case "china":
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config.Environment = cloud.AzureChina
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case "public":
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config.Environment = cloud.AzurePublic
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case "usgovernment":
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config.Environment = cloud.AzureGovernment
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default:
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return nil, fmt.Errorf("azuredns: unknown environment %s", environmentName)
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}
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} else {
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config.Environment = cloud.AzurePublic
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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.PrivateZone = env.GetOrDefaultBool(EnvPrivateZone, false)
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config.ClientID = env.GetOrFile(EnvClientID)
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config.ClientSecret = env.GetOrFile(EnvClientSecret)
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config.TenantID = env.GetOrFile(EnvTenantID)
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config.OIDCToken = env.GetOrFile(EnvOIDCToken)
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config.OIDCTokenFilePath = env.GetOrFile(EnvOIDCTokenFilePath)
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oidcValues, _ := env.GetWithFallback(
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[]string{EnvOIDCRequestURL, EnvGitHubOIDCRequestURL},
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[]string{EnvOIDCRequestToken, EnvGitHubOIDCRequestToken},
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)
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config.OIDCRequestURL = oidcValues[EnvOIDCRequestURL]
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config.OIDCRequestToken = oidcValues[EnvOIDCRequestToken]
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config.AuthMethod = env.GetOrFile(EnvAuthMethod)
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config.AuthMSITimeout = env.GetOrDefaultSecond(EnvAuthMSITimeout, 2*time.Second)
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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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func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
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if config == nil {
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return nil, errors.New("azuredns: 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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credentials, err := getCredentials(config)
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if err != nil {
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return nil, fmt.Errorf("azuredns: Unable to retrieve valid credentials: %w", err)
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}
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if config.SubscriptionID == "" {
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return nil, errors.New("azuredns: SubscriptionID is missing")
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}
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if config.ResourceGroup == "" {
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return nil, errors.New("azuredns: ResourceGroup is missing")
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}
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var dnsProvider challenge.ProviderTimeout
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if config.PrivateZone {
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dnsProvider, err = NewDNSProviderPrivate(config, credentials)
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if err != nil {
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return nil, fmt.Errorf("azuredns: %w", err)
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}
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} else {
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dnsProvider, err = NewDNSProviderPublic(config, credentials)
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if err != nil {
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return nil, fmt.Errorf("azuredns: %w", err)
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}
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}
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return &DNSProvider{provider: dnsProvider}, 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 getCredentials(config *Config) (azcore.TokenCredential, error) {
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clientOptions := azcore.ClientOptions{Cloud: config.Environment}
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switch strings.ToLower(config.AuthMethod) {
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case "env":
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if config.ClientID != "" && config.ClientSecret != "" && config.TenantID != "" {
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return azidentity.NewClientSecretCredential(config.TenantID, config.ClientID, config.ClientSecret,
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&azidentity.ClientSecretCredentialOptions{ClientOptions: clientOptions})
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}
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return azidentity.NewEnvironmentCredential(&azidentity.EnvironmentCredentialOptions{ClientOptions: clientOptions})
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case "wli":
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return azidentity.NewWorkloadIdentityCredential(&azidentity.WorkloadIdentityCredentialOptions{ClientOptions: clientOptions})
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case "msi":
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cred, err := azidentity.NewManagedIdentityCredential(&azidentity.ManagedIdentityCredentialOptions{ClientOptions: clientOptions})
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if err != nil {
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return nil, err
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}
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return &timeoutTokenCredential{cred: cred, timeout: config.AuthMSITimeout}, nil
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case "cli":
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return azidentity.NewAzureCLICredential(nil)
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case "oidc":
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err := checkOIDCConfig(config)
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if err != nil {
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return nil, err
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}
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return azidentity.NewClientAssertionCredential(config.TenantID, config.ClientID, getOIDCAssertion(config), &azidentity.ClientAssertionCredentialOptions{ClientOptions: clientOptions})
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default:
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return azidentity.NewDefaultAzureCredential(&azidentity.DefaultAzureCredentialOptions{ClientOptions: clientOptions})
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}
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}
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// timeoutTokenCredential wraps a TokenCredential to add a timeout.
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type timeoutTokenCredential struct {
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cred azcore.TokenCredential
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timeout time.Duration
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}
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// GetToken implements the azcore.TokenCredential interface.
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func (w *timeoutTokenCredential) GetToken(ctx context.Context, opts policy.TokenRequestOptions) (azcore.AccessToken, error) {
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if w.timeout <= 0 {
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return w.cred.GetToken(ctx, opts)
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}
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ctxTimeout, cancel := context.WithTimeout(ctx, w.timeout)
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defer cancel()
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tk, err := w.cred.GetToken(ctxTimeout, opts)
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if ce := ctxTimeout.Err(); errors.Is(ce, context.DeadlineExceeded) {
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return tk, azidentity.NewCredentialUnavailableError("managed identity timed out")
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}
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w.timeout = 0
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return tk, err
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}
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func deref[T string | int | int32 | int64](v *T) T {
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if v == nil {
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var zero T
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return zero
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}
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return *v
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}
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