mirror of
https://github.com/go-acme/lego.git
synced 2024-12-23 17:21:50 +02:00
282 lines
8.5 KiB
Go
282 lines
8.5 KiB
Go
// Package azuredns 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 azuredns
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/Azure/azure-sdk-for-go/sdk/azcore"
|
|
"github.com/Azure/azure-sdk-for-go/sdk/azcore/cloud"
|
|
"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
|
|
"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
|
|
"github.com/go-acme/lego/v4/challenge"
|
|
"github.com/go-acme/lego/v4/challenge/dns01"
|
|
"github.com/go-acme/lego/v4/platform/config/env"
|
|
)
|
|
|
|
// Environment variables names.
|
|
const (
|
|
envNamespace = "AZURE_"
|
|
|
|
EnvEnvironment = envNamespace + "ENVIRONMENT"
|
|
EnvSubscriptionID = envNamespace + "SUBSCRIPTION_ID"
|
|
EnvResourceGroup = envNamespace + "RESOURCE_GROUP"
|
|
EnvZoneName = envNamespace + "ZONE_NAME"
|
|
EnvPrivateZone = envNamespace + "PRIVATE_ZONE"
|
|
|
|
EnvTenantID = envNamespace + "TENANT_ID"
|
|
EnvClientID = envNamespace + "CLIENT_ID"
|
|
EnvClientSecret = envNamespace + "CLIENT_SECRET"
|
|
|
|
EnvOIDCToken = envNamespace + "OIDC_TOKEN"
|
|
EnvOIDCTokenFilePath = envNamespace + "OIDC_TOKEN_FILE_PATH"
|
|
EnvOIDCRequestURL = envNamespace + "OIDC_REQUEST_URL"
|
|
EnvOIDCRequestToken = envNamespace + "OIDC_REQUEST_TOKEN"
|
|
|
|
EnvAuthMethod = envNamespace + "AUTH_METHOD"
|
|
EnvAuthMSITimeout = envNamespace + "AUTH_MSI_TIMEOUT"
|
|
|
|
EnvServiceDiscoveryFilter = envNamespace + "SERVICEDISCOVERY_FILTER"
|
|
|
|
EnvTTL = envNamespace + "TTL"
|
|
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
|
|
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
|
|
|
|
EnvGitHubOIDCRequestURL = "ACTIONS_ID_TOKEN_REQUEST_URL"
|
|
EnvGitHubOIDCRequestToken = "ACTIONS_ID_TOKEN_REQUEST_TOKEN"
|
|
)
|
|
|
|
// Config is used to configure the creation of the DNSProvider.
|
|
type Config struct {
|
|
SubscriptionID string
|
|
ResourceGroup string
|
|
PrivateZone bool
|
|
|
|
Environment cloud.Configuration
|
|
|
|
// optional if using default Azure credentials
|
|
ClientID string
|
|
ClientSecret string
|
|
TenantID string
|
|
|
|
OIDCToken string
|
|
OIDCTokenFilePath string
|
|
OIDCRequestURL string
|
|
OIDCRequestToken string
|
|
|
|
AuthMethod string
|
|
AuthMSITimeout time.Duration
|
|
|
|
PropagationTimeout time.Duration
|
|
PollingInterval time.Duration
|
|
TTL int
|
|
HTTPClient *http.Client
|
|
|
|
ServiceDiscoveryFilter string
|
|
}
|
|
|
|
// NewDefaultConfig returns a default configuration for the DNSProvider.
|
|
func NewDefaultConfig() *Config {
|
|
return &Config{
|
|
TTL: env.GetOrDefaultInt(EnvTTL, 60),
|
|
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, 2*time.Minute),
|
|
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, 2*time.Second),
|
|
Environment: cloud.AzurePublic,
|
|
}
|
|
}
|
|
|
|
// DNSProvider implements the challenge.Provider interface.
|
|
type DNSProvider struct {
|
|
provider challenge.ProviderTimeout
|
|
}
|
|
|
|
// NewDNSProvider returns a DNSProvider instance configured for azuredns.
|
|
func NewDNSProvider() (*DNSProvider, error) {
|
|
config := NewDefaultConfig()
|
|
|
|
environmentName := env.GetOrFile(EnvEnvironment)
|
|
if environmentName != "" {
|
|
switch environmentName {
|
|
case "china":
|
|
config.Environment = cloud.AzureChina
|
|
case "public":
|
|
config.Environment = cloud.AzurePublic
|
|
case "usgovernment":
|
|
config.Environment = cloud.AzureGovernment
|
|
default:
|
|
return nil, fmt.Errorf("azuredns: unknown environment %s", environmentName)
|
|
}
|
|
} else {
|
|
config.Environment = cloud.AzurePublic
|
|
}
|
|
|
|
config.SubscriptionID = env.GetOrFile(EnvSubscriptionID)
|
|
config.ResourceGroup = env.GetOrFile(EnvResourceGroup)
|
|
config.PrivateZone = env.GetOrDefaultBool(EnvPrivateZone, false)
|
|
|
|
config.ClientID = env.GetOrFile(EnvClientID)
|
|
config.ClientSecret = env.GetOrFile(EnvClientSecret)
|
|
config.TenantID = env.GetOrFile(EnvTenantID)
|
|
|
|
config.OIDCToken = env.GetOrFile(EnvOIDCToken)
|
|
config.OIDCTokenFilePath = env.GetOrFile(EnvOIDCTokenFilePath)
|
|
|
|
config.ServiceDiscoveryFilter = env.GetOrFile(EnvServiceDiscoveryFilter)
|
|
|
|
oidcValues, _ := env.GetWithFallback(
|
|
[]string{EnvOIDCRequestURL, EnvGitHubOIDCRequestURL},
|
|
[]string{EnvOIDCRequestToken, EnvGitHubOIDCRequestToken},
|
|
)
|
|
|
|
config.OIDCRequestURL = oidcValues[EnvOIDCRequestURL]
|
|
config.OIDCRequestToken = oidcValues[EnvOIDCRequestToken]
|
|
|
|
config.AuthMethod = env.GetOrFile(EnvAuthMethod)
|
|
config.AuthMSITimeout = env.GetOrDefaultSecond(EnvAuthMSITimeout, 2*time.Second)
|
|
|
|
return NewDNSProviderConfig(config)
|
|
}
|
|
|
|
// NewDNSProviderConfig return a DNSProvider instance configured for Azure.
|
|
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
|
|
if config == nil {
|
|
return nil, errors.New("azuredns: the configuration of the DNS provider is nil")
|
|
}
|
|
|
|
if config.HTTPClient == nil {
|
|
config.HTTPClient = &http.Client{Timeout: 5 * time.Second}
|
|
}
|
|
|
|
credentials, err := getCredentials(config)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("azuredns: Unable to retrieve valid credentials: %w", err)
|
|
}
|
|
|
|
var dnsProvider challenge.ProviderTimeout
|
|
if config.PrivateZone {
|
|
dnsProvider, err = NewDNSProviderPrivate(config, credentials)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("azuredns: %w", err)
|
|
}
|
|
} else {
|
|
dnsProvider, err = NewDNSProviderPublic(config, credentials)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("azuredns: %w", err)
|
|
}
|
|
}
|
|
|
|
return &DNSProvider{provider: dnsProvider}, 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.provider.Timeout()
|
|
}
|
|
|
|
// Present creates a TXT record to fulfill the dns-01 challenge.
|
|
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
|
|
return d.provider.Present(domain, token, keyAuth)
|
|
}
|
|
|
|
// CleanUp removes the TXT record matching the specified parameters.
|
|
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
|
|
return d.provider.CleanUp(domain, token, keyAuth)
|
|
}
|
|
|
|
func getCredentials(config *Config) (azcore.TokenCredential, error) {
|
|
clientOptions := azcore.ClientOptions{Cloud: config.Environment}
|
|
|
|
switch strings.ToLower(config.AuthMethod) {
|
|
case "env":
|
|
if config.ClientID != "" && config.ClientSecret != "" && config.TenantID != "" {
|
|
return azidentity.NewClientSecretCredential(config.TenantID, config.ClientID, config.ClientSecret,
|
|
&azidentity.ClientSecretCredentialOptions{ClientOptions: clientOptions})
|
|
}
|
|
|
|
return azidentity.NewEnvironmentCredential(&azidentity.EnvironmentCredentialOptions{ClientOptions: clientOptions})
|
|
|
|
case "wli":
|
|
return azidentity.NewWorkloadIdentityCredential(&azidentity.WorkloadIdentityCredentialOptions{ClientOptions: clientOptions})
|
|
|
|
case "msi":
|
|
cred, err := azidentity.NewManagedIdentityCredential(&azidentity.ManagedIdentityCredentialOptions{ClientOptions: clientOptions})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &timeoutTokenCredential{cred: cred, timeout: config.AuthMSITimeout}, nil
|
|
|
|
case "cli":
|
|
var credOptions *azidentity.AzureCLICredentialOptions
|
|
if config.TenantID != "" {
|
|
credOptions = &azidentity.AzureCLICredentialOptions{TenantID: config.TenantID}
|
|
}
|
|
return azidentity.NewAzureCLICredential(credOptions)
|
|
|
|
case "oidc":
|
|
err := checkOIDCConfig(config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return azidentity.NewClientAssertionCredential(config.TenantID, config.ClientID, getOIDCAssertion(config), &azidentity.ClientAssertionCredentialOptions{ClientOptions: clientOptions})
|
|
|
|
default:
|
|
return azidentity.NewDefaultAzureCredential(&azidentity.DefaultAzureCredentialOptions{ClientOptions: clientOptions})
|
|
}
|
|
}
|
|
|
|
// timeoutTokenCredential wraps a TokenCredential to add a timeout.
|
|
type timeoutTokenCredential struct {
|
|
cred azcore.TokenCredential
|
|
timeout time.Duration
|
|
}
|
|
|
|
// GetToken implements the azcore.TokenCredential interface.
|
|
func (w *timeoutTokenCredential) GetToken(ctx context.Context, opts policy.TokenRequestOptions) (azcore.AccessToken, error) {
|
|
if w.timeout <= 0 {
|
|
return w.cred.GetToken(ctx, opts)
|
|
}
|
|
|
|
ctxTimeout, cancel := context.WithTimeout(ctx, w.timeout)
|
|
defer cancel()
|
|
|
|
tk, err := w.cred.GetToken(ctxTimeout, opts)
|
|
if ce := ctxTimeout.Err(); errors.Is(ce, context.DeadlineExceeded) {
|
|
return tk, azidentity.NewCredentialUnavailableError("managed identity timed out")
|
|
}
|
|
|
|
w.timeout = 0
|
|
|
|
return tk, err
|
|
}
|
|
|
|
func getAuthZone(fqdn string) (string, error) {
|
|
authZone := env.GetOrFile(EnvZoneName)
|
|
if authZone != "" {
|
|
return authZone, nil
|
|
}
|
|
|
|
authZone, err := dns01.FindZoneByFqdn(fqdn)
|
|
if err != nil {
|
|
return "", fmt.Errorf("could not find zone: %w", err)
|
|
}
|
|
|
|
return authZone, nil
|
|
}
|
|
|
|
func deref[T any](v *T) T {
|
|
if v == nil {
|
|
var zero T
|
|
return zero
|
|
}
|
|
|
|
return *v
|
|
}
|