277 lines
7.8 KiB
Go
277 lines
7.8 KiB
Go
// Package alidns implements a DNS provider for solving the DNS-01 challenge using Alibaba Cloud DNS.
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package alidns
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import (
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"errors"
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"fmt"
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"time"
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"github.com/aliyun/alibaba-cloud-sdk-go/sdk"
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"github.com/aliyun/alibaba-cloud-sdk-go/sdk/auth"
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"github.com/aliyun/alibaba-cloud-sdk-go/sdk/auth/credentials"
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"github.com/aliyun/alibaba-cloud-sdk-go/sdk/requests"
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"github.com/aliyun/alibaba-cloud-sdk-go/services/alidns"
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"github.com/go-acme/lego/v4/challenge/dns01"
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"github.com/go-acme/lego/v4/platform/config/env"
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"golang.org/x/net/idna"
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)
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const defaultRegionID = "cn-hangzhou"
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// Environment variables names.
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const (
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envNamespace = "ALICLOUD_"
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EnvRAMRole = envNamespace + "RAM_ROLE"
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EnvAccessKey = envNamespace + "ACCESS_KEY"
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EnvSecretKey = envNamespace + "SECRET_KEY"
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EnvSecurityToken = envNamespace + "SECURITY_TOKEN"
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EnvRegionID = envNamespace + "REGION_ID"
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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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EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
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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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RAMRole string
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APIKey string
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SecretKey string
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SecurityToken string
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RegionID 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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HTTPTimeout time.Duration
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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, 600),
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PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
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PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
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HTTPTimeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 10*time.Second),
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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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config *Config
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client *alidns.Client
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}
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// NewDNSProvider returns a DNSProvider instance configured for Alibaba Cloud DNS.
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// - If you're using the instance RAM role, the RAM role environment variable must be passed in: ALICLOUD_RAM_ROLE.
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// - Other than that, credentials must be passed in the environment variables:
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// ALICLOUD_ACCESS_KEY, ALICLOUD_SECRET_KEY, and optionally ALICLOUD_SECURITY_TOKEN.
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func NewDNSProvider() (*DNSProvider, error) {
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config := NewDefaultConfig()
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config.RegionID = env.GetOrFile(EnvRegionID)
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values, err := env.Get(EnvRAMRole)
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if err == nil {
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config.RAMRole = values[EnvRAMRole]
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return NewDNSProviderConfig(config)
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}
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values, err = env.Get(EnvAccessKey, EnvSecretKey)
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if err != nil {
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return nil, fmt.Errorf("alicloud: %w", err)
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}
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config.APIKey = values[EnvAccessKey]
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config.SecretKey = values[EnvSecretKey]
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config.SecurityToken = env.GetOrFile(EnvSecurityToken)
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for alidns.
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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("alicloud: the configuration of the DNS provider is nil")
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}
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if config.RegionID == "" {
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config.RegionID = defaultRegionID
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}
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var credential auth.Credential
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switch {
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case config.RAMRole != "":
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credential = credentials.NewEcsRamRoleCredential(config.RAMRole)
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case config.APIKey != "" && config.SecretKey != "" && config.SecurityToken != "":
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credential = credentials.NewStsTokenCredential(config.APIKey, config.SecretKey, config.SecurityToken)
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case config.APIKey != "" && config.SecretKey != "":
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credential = credentials.NewAccessKeyCredential(config.APIKey, config.SecretKey)
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default:
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return nil, fmt.Errorf("alicloud: ram role or credentials missing")
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}
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conf := sdk.NewConfig().WithTimeout(config.HTTPTimeout)
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client, err := alidns.NewClientWithOptions(config.RegionID, conf, credential)
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if err != nil {
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return nil, fmt.Errorf("alicloud: credentials failed: %w", err)
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}
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return &DNSProvider{config: config, client: client}, 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.config.PropagationTimeout, d.config.PollingInterval
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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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fqdn, value := dns01.GetRecord(domain, keyAuth)
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zoneName, err := d.getHostedZone(fqdn)
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if err != nil {
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return fmt.Errorf("alicloud: %w", err)
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}
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recordAttributes, err := d.newTxtRecord(zoneName, fqdn, value)
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if err != nil {
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return err
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}
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_, err = d.client.AddDomainRecord(recordAttributes)
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if err != nil {
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return fmt.Errorf("alicloud: API call failed: %w", err)
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}
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return nil
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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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fqdn, _ := dns01.GetRecord(domain, keyAuth)
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records, err := d.findTxtRecords(fqdn)
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if err != nil {
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return fmt.Errorf("alicloud: %w", err)
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}
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_, err = d.getHostedZone(fqdn)
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if err != nil {
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return fmt.Errorf("alicloud: %w", err)
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}
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for _, rec := range records {
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request := alidns.CreateDeleteDomainRecordRequest()
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request.RecordId = rec.RecordId
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_, err = d.client.DeleteDomainRecord(request)
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if err != nil {
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return fmt.Errorf("alicloud: %w", err)
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}
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}
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return nil
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}
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func (d *DNSProvider) getHostedZone(domain string) (string, error) {
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request := alidns.CreateDescribeDomainsRequest()
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var domains []alidns.DomainInDescribeDomains
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startPage := 1
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for {
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request.PageNumber = requests.NewInteger(startPage)
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response, err := d.client.DescribeDomains(request)
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if err != nil {
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return "", fmt.Errorf("API call failed: %w", err)
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}
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domains = append(domains, response.Domains.Domain...)
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if response.PageNumber*response.PageSize >= response.TotalCount {
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break
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}
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startPage++
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}
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authZone, err := dns01.FindZoneByFqdn(domain)
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if err != nil {
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return "", err
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}
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var hostedZone alidns.DomainInDescribeDomains
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for _, zone := range domains {
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if zone.DomainName == dns01.UnFqdn(authZone) || zone.PunyCode == dns01.UnFqdn(authZone) {
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hostedZone = zone
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}
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}
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if hostedZone.DomainId == "" {
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return "", fmt.Errorf("zone %s not found in AliDNS for domain %s", authZone, domain)
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}
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return hostedZone.DomainName, nil
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}
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func (d *DNSProvider) newTxtRecord(zone, fqdn, value string) (*alidns.AddDomainRecordRequest, error) {
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request := alidns.CreateAddDomainRecordRequest()
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request.Type = "TXT"
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request.DomainName = zone
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var err error
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request.RR, err = extractRecordName(fqdn, zone)
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if err != nil {
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return nil, err
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}
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request.Value = value
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request.TTL = requests.NewInteger(d.config.TTL)
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return request, nil
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}
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func (d *DNSProvider) findTxtRecords(fqdn string) ([]alidns.Record, error) {
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zoneName, err := d.getHostedZone(fqdn)
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if err != nil {
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return nil, err
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}
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request := alidns.CreateDescribeDomainRecordsRequest()
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request.DomainName = zoneName
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request.PageSize = requests.NewInteger(500)
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var records []alidns.Record
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result, err := d.client.DescribeDomainRecords(request)
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if err != nil {
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return records, fmt.Errorf("API call has failed: %w", err)
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}
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recordName, err := extractRecordName(fqdn, zoneName)
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if err != nil {
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return nil, err
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}
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for _, record := range result.DomainRecords.Record {
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if record.RR == recordName && record.Type == "TXT" {
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records = append(records, record)
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}
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}
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return records, nil
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}
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func extractRecordName(fqdn, zone string) (string, error) {
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asciiDomain, err := idna.ToASCII(zone)
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if err != nil {
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return "", fmt.Errorf("fail to convert punycode: %w", err)
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}
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subDomain, err := dns01.ExtractSubDomain(fqdn, asciiDomain)
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if err != nil {
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return "", err
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}
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return subDomain, nil
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}
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