package acme import ( "context" "crypto/tls" "crypto/x509" "fmt" "io/ioutil" fmtlog "log" "net/url" "reflect" "strings" "sync" "time" "github.com/cenkalti/backoff" "github.com/containous/flaeg/parse" "github.com/containous/traefik/pkg/config" "github.com/containous/traefik/pkg/log" "github.com/containous/traefik/pkg/rules" "github.com/containous/traefik/pkg/safe" traefiktls "github.com/containous/traefik/pkg/tls" "github.com/containous/traefik/pkg/types" "github.com/containous/traefik/pkg/version" "github.com/go-acme/lego/certificate" "github.com/go-acme/lego/challenge" "github.com/go-acme/lego/challenge/dns01" "github.com/go-acme/lego/lego" legolog "github.com/go-acme/lego/log" "github.com/go-acme/lego/providers/dns" "github.com/go-acme/lego/registration" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) var ( // oscpMustStaple enables OSCP stapling as from https://github.com/go-acme/lego/issues/270 oscpMustStaple = false ) // Configuration holds ACME configuration provided by users type Configuration struct { Email string `description:"Email address used for registration"` ACMELogging bool `description:"Enable debug logging of ACME actions."` CAServer string `description:"CA server to use."` Storage string `description:"Storage to use."` EntryPoint string `description:"EntryPoint to use."` KeyType string `description:"KeyType used for generating certificate private key. Allow value 'EC256', 'EC384', 'RSA2048', 'RSA4096', 'RSA8192'. Default to 'RSA4096'"` OnHostRule bool `description:"Enable certificate generation on frontends Host rules."` DNSChallenge *DNSChallenge `description:"Activate DNS-01 Challenge"` HTTPChallenge *HTTPChallenge `description:"Activate HTTP-01 Challenge"` TLSChallenge *TLSChallenge `description:"Activate TLS-ALPN-01 Challenge"` Domains []types.Domain `description:"CN and SANs (alternative domains) to each main domain using format: --acme.domains='main.com,san1.com,san2.com' --acme.domains='*.main.net'. No SANs for wildcards domain. Wildcard domains only accepted with DNSChallenge"` } // Certificate is a struct which contains all data needed from an ACME certificate type Certificate struct { Domain types.Domain Certificate []byte Key []byte } // DNSChallenge contains DNS challenge Configuration type DNSChallenge struct { Provider string `description:"Use a DNS-01 based challenge provider rather than HTTPS."` DelayBeforeCheck parse.Duration `description:"Assume DNS propagates after a delay in seconds rather than finding and querying nameservers."` Resolvers types.DNSResolvers `description:"Use following DNS servers to resolve the FQDN authority."` DisablePropagationCheck bool `description:"Disable the DNS propagation checks before notifying ACME that the DNS challenge is ready. [not recommended]"` preCheckTimeout time.Duration preCheckInterval time.Duration } // HTTPChallenge contains HTTP challenge Configuration type HTTPChallenge struct { EntryPoint string `description:"HTTP challenge EntryPoint"` } // TLSChallenge contains TLS challenge Configuration type TLSChallenge struct{} // Provider holds configurations of the provider. type Provider struct { *Configuration Store Store certificates []*Certificate account *Account client *lego.Client certsChan chan *Certificate configurationChan chan<- config.Message tlsManager *traefiktls.Manager clientMutex sync.Mutex configFromListenerChan chan config.Configuration pool *safe.Pool resolvingDomains map[string]struct{} resolvingDomainsMutex sync.RWMutex } // SetTLSManager sets the tls manager to use func (p *Provider) SetTLSManager(tlsManager *traefiktls.Manager) { p.tlsManager = tlsManager } // SetConfigListenerChan initializes the configFromListenerChan func (p *Provider) SetConfigListenerChan(configFromListenerChan chan config.Configuration) { p.configFromListenerChan = configFromListenerChan } // ListenConfiguration sets a new Configuration into the configFromListenerChan func (p *Provider) ListenConfiguration(config config.Configuration) { p.configFromListenerChan <- config } // ListenRequest resolves new certificates for a domain from an incoming request and return a valid Certificate to serve (onDemand option) func (p *Provider) ListenRequest(domain string) (*tls.Certificate, error) { ctx := log.With(context.Background(), log.Str(log.ProviderName, "acme")) acmeCert, err := p.resolveCertificate(ctx, types.Domain{Main: domain}, false) if acmeCert == nil || err != nil { return nil, err } cert, err := tls.X509KeyPair(acmeCert.Certificate, acmeCert.PrivateKey) return &cert, err } // Init for compatibility reason the BaseProvider implements an empty Init func (p *Provider) Init() error { ctx := log.With(context.Background(), log.Str(log.ProviderName, "acme")) logger := log.FromContext(ctx) if p.ACMELogging { legolog.Logger = fmtlog.New(logger.WriterLevel(logrus.InfoLevel), "legolog: ", 0) } else { legolog.Logger = fmtlog.New(ioutil.Discard, "", 0) } if len(p.Configuration.Storage) == 0 { return errors.New("unable to initialize ACME provider with no storage location for the certificates") } p.Store = NewLocalStore(p.Configuration.Storage) var err error p.account, err = p.Store.GetAccount() if err != nil { return fmt.Errorf("unable to get ACME account : %v", err) } // Reset Account if caServer changed, thus registration URI can be updated if p.account != nil && p.account.Registration != nil && !isAccountMatchingCaServer(ctx, p.account.Registration.URI, p.CAServer) { logger.Info("Account URI does not match the current CAServer. The account will be reset.") p.account = nil } p.certificates, err = p.Store.GetCertificates() if err != nil { return fmt.Errorf("unable to get ACME certificates : %v", err) } // Init the currently resolved domain map p.resolvingDomains = make(map[string]struct{}) return nil } func isAccountMatchingCaServer(ctx context.Context, accountURI string, serverURI string) bool { logger := log.FromContext(ctx) aru, err := url.Parse(accountURI) if err != nil { logger.Infof("Unable to parse account.Registration URL: %v", err) return false } cau, err := url.Parse(serverURI) if err != nil { logger.Infof("Unable to parse CAServer URL: %v", err) return false } return cau.Hostname() == aru.Hostname() } // Provide allows the file provider to provide configurations to traefik // using the given Configuration channel. func (p *Provider) Provide(configurationChan chan<- config.Message, pool *safe.Pool) error { ctx := log.With(context.Background(), log.Str(log.ProviderName, "acme")) p.pool = pool p.watchCertificate(ctx) p.watchNewDomains(ctx) p.configurationChan = configurationChan p.refreshCertificates() p.deleteUnnecessaryDomains(ctx) for i := 0; i < len(p.Domains); i++ { domain := p.Domains[i] safe.Go(func() { if _, err := p.resolveCertificate(ctx, domain, true); err != nil { log.WithoutContext().WithField(log.ProviderName, "acme"). Errorf("Unable to obtain ACME certificate for domains %q : %v", strings.Join(domain.ToStrArray(), ","), err) } }) } p.renewCertificates(ctx) ticker := time.NewTicker(24 * time.Hour) pool.Go(func(stop chan bool) { for { select { case <-ticker.C: p.renewCertificates(ctx) case <-stop: ticker.Stop() return } } }) return nil } func (p *Provider) getClient() (*lego.Client, error) { p.clientMutex.Lock() defer p.clientMutex.Unlock() ctx := log.With(context.Background(), log.Str(log.ProviderName, "acme")) logger := log.FromContext(ctx) if p.client != nil { return p.client, nil } account, err := p.initAccount(ctx) if err != nil { return nil, err } logger.Debug("Building ACME client...") caServer := "https://acme-v02.api.letsencrypt.org/directory" if len(p.CAServer) > 0 { caServer = p.CAServer } logger.Debug(caServer) config := lego.NewConfig(account) config.CADirURL = caServer config.Certificate.KeyType = account.KeyType config.UserAgent = fmt.Sprintf("containous-traefik/%s", version.Version) client, err := lego.NewClient(config) if err != nil { return nil, err } // New users will need to register; be sure to save it if account.GetRegistration() == nil { logger.Info("Register...") reg, errR := client.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: true}) if errR != nil { return nil, errR } account.Registration = reg } // Save the account once before all the certificates generation/storing // No certificate can be generated if account is not initialized err = p.Store.SaveAccount(account) if err != nil { return nil, err } switch { case p.DNSChallenge != nil && len(p.DNSChallenge.Provider) > 0: logger.Debugf("Using DNS Challenge provider: %s", p.DNSChallenge.Provider) var provider challenge.Provider provider, err = dns.NewDNSChallengeProviderByName(p.DNSChallenge.Provider) if err != nil { return nil, err } err = client.Challenge.SetDNS01Provider(provider, dns01.CondOption(len(p.DNSChallenge.Resolvers) > 0, dns01.AddRecursiveNameservers(p.DNSChallenge.Resolvers)), dns01.CondOption(p.DNSChallenge.DisablePropagationCheck || p.DNSChallenge.DelayBeforeCheck > 0, dns01.AddPreCheck(func(_, _ string) (bool, error) { if p.DNSChallenge.DelayBeforeCheck > 0 { log.Debugf("Delaying %d rather than validating DNS propagation now.", p.DNSChallenge.DelayBeforeCheck) time.Sleep(time.Duration(p.DNSChallenge.DelayBeforeCheck)) } return true, nil })), ) if err != nil { return nil, err } // Same default values than LEGO p.DNSChallenge.preCheckTimeout = 60 * time.Second p.DNSChallenge.preCheckInterval = 2 * time.Second // Set the precheck timeout into the DNSChallenge provider if challengeProviderTimeout, ok := provider.(challenge.ProviderTimeout); ok { p.DNSChallenge.preCheckTimeout, p.DNSChallenge.preCheckInterval = challengeProviderTimeout.Timeout() } case p.HTTPChallenge != nil && len(p.HTTPChallenge.EntryPoint) > 0: logger.Debug("Using HTTP Challenge provider.") err = client.Challenge.SetHTTP01Provider(&challengeHTTP{Store: p.Store}) if err != nil { return nil, err } case p.TLSChallenge != nil: logger.Debug("Using TLS Challenge provider.") err = client.Challenge.SetTLSALPN01Provider(&challengeTLSALPN{Store: p.Store}) if err != nil { return nil, err } default: return nil, errors.New("ACME challenge not specified, please select TLS or HTTP or DNS Challenge") } p.client = client return p.client, nil } func (p *Provider) initAccount(ctx context.Context) (*Account, error) { if p.account == nil || len(p.account.Email) == 0 { var err error p.account, err = NewAccount(ctx, p.Email, p.KeyType) if err != nil { return nil, err } } // Set the KeyType if not already defined in the account if len(p.account.KeyType) == 0 { p.account.KeyType = GetKeyType(ctx, p.KeyType) } return p.account, nil } func (p *Provider) resolveDomains(ctx context.Context, domains []string) { if len(domains) == 0 { log.FromContext(ctx).Debug("No domain parsed in provider ACME") return } log.FromContext(ctx).Debugf("Try to challenge certificate for domain %v founded in HostSNI rule", domains) var domain types.Domain if len(domains) > 0 { domain = types.Domain{Main: domains[0]} if len(domains) > 1 { domain.SANs = domains[1:] } safe.Go(func() { if _, err := p.resolveCertificate(ctx, domain, false); err != nil { log.FromContext(ctx).Errorf("Unable to obtain ACME certificate for domains %q: %v", strings.Join(domains, ","), err) } }) } } func (p *Provider) watchNewDomains(ctx context.Context) { p.pool.Go(func(stop chan bool) { for { select { case config := <-p.configFromListenerChan: if config.TCP != nil { for routerName, route := range config.TCP.Routers { if route.TLS == nil { continue } ctxRouter := log.With(ctx, log.Str(log.RouterName, routerName), log.Str(log.Rule, route.Rule)) domains, err := rules.ParseHostSNI(route.Rule) if err != nil { log.FromContext(ctxRouter).Errorf("Error parsing domains in provider ACME: %v", err) continue } p.resolveDomains(ctxRouter, domains) } } for routerName, route := range config.HTTP.Routers { if route.TLS == nil { continue } ctxRouter := log.With(ctx, log.Str(log.RouterName, routerName), log.Str(log.Rule, route.Rule)) domains, err := rules.ParseDomains(route.Rule) if err != nil { log.FromContext(ctxRouter).Errorf("Error parsing domains in provider ACME: %v", err) continue } p.resolveDomains(ctxRouter, domains) } case <-stop: return } } }) } func (p *Provider) resolveCertificate(ctx context.Context, domain types.Domain, domainFromConfigurationFile bool) (*certificate.Resource, error) { domains, err := p.getValidDomains(ctx, domain, domainFromConfigurationFile) if err != nil { return nil, err } // Check provided certificates uncheckedDomains := p.getUncheckedDomains(ctx, domains, !domainFromConfigurationFile) if len(uncheckedDomains) == 0 { return nil, nil } p.addResolvingDomains(uncheckedDomains) defer p.removeResolvingDomains(uncheckedDomains) logger := log.FromContext(ctx) logger.Debugf("Loading ACME certificates %+v...", uncheckedDomains) client, err := p.getClient() if err != nil { return nil, fmt.Errorf("cannot get ACME client %v", err) } var cert *certificate.Resource bundle := true if p.useCertificateWithRetry(uncheckedDomains) { cert, err = obtainCertificateWithRetry(ctx, domains, client, p.DNSChallenge.preCheckTimeout, p.DNSChallenge.preCheckInterval, bundle) } else { request := certificate.ObtainRequest{ Domains: domains, Bundle: bundle, MustStaple: oscpMustStaple, } cert, err = client.Certificate.Obtain(request) } if err != nil { return nil, fmt.Errorf("unable to generate a certificate for the domains %v: %v", uncheckedDomains, err) } if cert == nil { return nil, fmt.Errorf("domains %v do not generate a certificate", uncheckedDomains) } if len(cert.Certificate) == 0 || len(cert.PrivateKey) == 0 { return nil, fmt.Errorf("domains %v generate certificate with no value: %v", uncheckedDomains, cert) } logger.Debugf("Certificates obtained for domains %+v", uncheckedDomains) if len(uncheckedDomains) > 1 { domain = types.Domain{Main: uncheckedDomains[0], SANs: uncheckedDomains[1:]} } else { domain = types.Domain{Main: uncheckedDomains[0]} } p.addCertificateForDomain(domain, cert.Certificate, cert.PrivateKey) return cert, nil } func (p *Provider) removeResolvingDomains(resolvingDomains []string) { p.resolvingDomainsMutex.Lock() defer p.resolvingDomainsMutex.Unlock() for _, domain := range resolvingDomains { delete(p.resolvingDomains, domain) } } func (p *Provider) addResolvingDomains(resolvingDomains []string) { p.resolvingDomainsMutex.Lock() defer p.resolvingDomainsMutex.Unlock() for _, domain := range resolvingDomains { p.resolvingDomains[domain] = struct{}{} } } func (p *Provider) useCertificateWithRetry(domains []string) bool { // Check if we can use the retry mechanism only if we use the DNS Challenge and if is there are at least 2 domains to check if p.DNSChallenge != nil && len(domains) > 1 { rootDomain := "" for _, searchWildcardDomain := range domains { // Search a wildcard domain if not already found if len(rootDomain) == 0 && strings.HasPrefix(searchWildcardDomain, "*.") { rootDomain = strings.TrimPrefix(searchWildcardDomain, "*.") if len(rootDomain) > 0 { // Look for a root domain which matches the wildcard domain for _, searchRootDomain := range domains { if rootDomain == searchRootDomain { // If the domains list contains a wildcard domain and its root domain, we can use the retry mechanism to obtain the certificate return true } } } // There is only one wildcard domain in the slice, if its root domain has not been found, the retry mechanism does not have to be used return false } } } return false } func obtainCertificateWithRetry(ctx context.Context, domains []string, client *lego.Client, timeout, interval time.Duration, bundle bool) (*certificate.Resource, error) { logger := log.FromContext(ctx) var cert *certificate.Resource var err error operation := func() error { request := certificate.ObtainRequest{ Domains: domains, Bundle: bundle, MustStaple: oscpMustStaple, } cert, err = client.Certificate.Obtain(request) return err } notify := func(err error, time time.Duration) { logger.Errorf("Error obtaining certificate retrying in %s", time) } // Define a retry backOff to let LEGO tries twice to obtain a certificate for both wildcard and root domain ebo := backoff.NewExponentialBackOff() ebo.MaxElapsedTime = 2 * timeout ebo.MaxInterval = interval rbo := backoff.WithMaxRetries(ebo, 2) err = backoff.RetryNotify(safe.OperationWithRecover(operation), rbo, notify) if err != nil { logger.Errorf("Error obtaining certificate: %v", err) return nil, err } return cert, nil } func (p *Provider) addCertificateForDomain(domain types.Domain, certificate []byte, key []byte) { p.certsChan <- &Certificate{Certificate: certificate, Key: key, Domain: domain} } // deleteUnnecessaryDomains deletes from the configuration : // - Duplicated domains // - Domains which are checked by wildcard domain func (p *Provider) deleteUnnecessaryDomains(ctx context.Context) { var newDomains []types.Domain logger := log.FromContext(ctx) for idxDomainToCheck, domainToCheck := range p.Domains { keepDomain := true for idxDomain, domain := range p.Domains { if idxDomainToCheck == idxDomain { continue } if reflect.DeepEqual(domain, domainToCheck) { if idxDomainToCheck > idxDomain { logger.Warnf("The domain %v is duplicated in the configuration but will be process by ACME provider only once.", domainToCheck) keepDomain = false } break } // Check if CN or SANS to check already exists // or can not be checked by a wildcard var newDomainsToCheck []string for _, domainProcessed := range domainToCheck.ToStrArray() { if idxDomain < idxDomainToCheck && isDomainAlreadyChecked(domainProcessed, domain.ToStrArray()) { // The domain is duplicated in a CN logger.Warnf("Domain %q is duplicated in the configuration or validated by the domain %v. It will be processed once.", domainProcessed, domain) continue } else if domain.Main != domainProcessed && strings.HasPrefix(domain.Main, "*") && isDomainAlreadyChecked(domainProcessed, []string{domain.Main}) { // Check if a wildcard can validate the domain logger.Warnf("Domain %q will not be processed by ACME provider because it is validated by the wildcard %q", domainProcessed, domain.Main) continue } newDomainsToCheck = append(newDomainsToCheck, domainProcessed) } // Delete the domain if both Main and SANs can be validated by the wildcard domain // otherwise keep the unchecked values if newDomainsToCheck == nil { keepDomain = false break } domainToCheck.Set(newDomainsToCheck) } if keepDomain { newDomains = append(newDomains, domainToCheck) } } p.Domains = newDomains } func (p *Provider) watchCertificate(ctx context.Context) { p.certsChan = make(chan *Certificate) p.pool.Go(func(stop chan bool) { for { select { case cert := <-p.certsChan: certUpdated := false for _, domainsCertificate := range p.certificates { if reflect.DeepEqual(cert.Domain, domainsCertificate.Domain) { domainsCertificate.Certificate = cert.Certificate domainsCertificate.Key = cert.Key certUpdated = true break } } if !certUpdated { p.certificates = append(p.certificates, cert) } err := p.saveCertificates() if err != nil { log.FromContext(ctx).Error(err) } case <-stop: return } } }) } func (p *Provider) saveCertificates() error { err := p.Store.SaveCertificates(p.certificates) p.refreshCertificates() return err } func (p *Provider) refreshCertificates() { conf := config.Message{ ProviderName: "ACME", Configuration: &config.Configuration{ HTTP: &config.HTTPConfiguration{ Routers: map[string]*config.Router{}, Middlewares: map[string]*config.Middleware{}, Services: map[string]*config.Service{}, }, TLS: []*traefiktls.Configuration{}, }, } for _, cert := range p.certificates { cert := &traefiktls.Certificate{CertFile: traefiktls.FileOrContent(cert.Certificate), KeyFile: traefiktls.FileOrContent(cert.Key)} conf.Configuration.TLS = append(conf.Configuration.TLS, &traefiktls.Configuration{Certificate: cert}) } p.configurationChan <- conf } func (p *Provider) renewCertificates(ctx context.Context) { logger := log.FromContext(ctx) logger.Info("Testing certificate renew...") for _, cert := range p.certificates { crt, err := getX509Certificate(ctx, cert) // If there's an error, we assume the cert is broken, and needs update // <= 30 days left, renew certificate if err != nil || crt == nil || crt.NotAfter.Before(time.Now().Add(24*30*time.Hour)) { client, err := p.getClient() if err != nil { logger.Infof("Error renewing certificate from LE : %+v, %v", cert.Domain, err) continue } logger.Infof("Renewing certificate from LE : %+v", cert.Domain) renewedCert, err := client.Certificate.Renew(certificate.Resource{ Domain: cert.Domain.Main, PrivateKey: cert.Key, Certificate: cert.Certificate, }, true, oscpMustStaple) if err != nil { logger.Errorf("Error renewing certificate from LE: %v, %v", cert.Domain, err) continue } if len(renewedCert.Certificate) == 0 || len(renewedCert.PrivateKey) == 0 { logger.Errorf("domains %v renew certificate with no value: %v", cert.Domain.ToStrArray(), cert) continue } p.addCertificateForDomain(cert.Domain, renewedCert.Certificate, renewedCert.PrivateKey) } } } // Get provided certificate which check a domains list (Main and SANs) // from static and dynamic provided certificates func (p *Provider) getUncheckedDomains(ctx context.Context, domainsToCheck []string, checkConfigurationDomains bool) []string { p.resolvingDomainsMutex.RLock() defer p.resolvingDomainsMutex.RUnlock() log.FromContext(ctx).Debugf("Looking for provided certificate(s) to validate %q...", domainsToCheck) allDomains := p.tlsManager.GetStore("default").GetAllDomains() // Get ACME certificates for _, cert := range p.certificates { allDomains = append(allDomains, strings.Join(cert.Domain.ToStrArray(), ",")) } // Get currently resolved domains for domain := range p.resolvingDomains { allDomains = append(allDomains, domain) } // Get Configuration Domains if checkConfigurationDomains { for i := 0; i < len(p.Domains); i++ { allDomains = append(allDomains, strings.Join(p.Domains[i].ToStrArray(), ",")) } } return searchUncheckedDomains(ctx, domainsToCheck, allDomains) } func searchUncheckedDomains(ctx context.Context, domainsToCheck []string, existentDomains []string) []string { var uncheckedDomains []string for _, domainToCheck := range domainsToCheck { if !isDomainAlreadyChecked(domainToCheck, existentDomains) { uncheckedDomains = append(uncheckedDomains, domainToCheck) } } logger := log.FromContext(ctx) if len(uncheckedDomains) == 0 { logger.Debugf("No ACME certificate generation required for domains %q.", domainsToCheck) } else { logger.Debugf("Domains %q need ACME certificates generation for domains %q.", domainsToCheck, strings.Join(uncheckedDomains, ",")) } return uncheckedDomains } func getX509Certificate(ctx context.Context, cert *Certificate) (*x509.Certificate, error) { logger := log.FromContext(ctx) tlsCert, err := tls.X509KeyPair(cert.Certificate, cert.Key) if err != nil { logger.Errorf("Failed to load TLS key pair from ACME certificate for domain %q (SAN : %q), certificate will be renewed : %v", cert.Domain.Main, strings.Join(cert.Domain.SANs, ","), err) return nil, err } crt := tlsCert.Leaf if crt == nil { crt, err = x509.ParseCertificate(tlsCert.Certificate[0]) if err != nil { logger.Errorf("Failed to parse TLS key pair from ACME certificate for domain %q (SAN : %q), certificate will be renewed : %v", cert.Domain.Main, strings.Join(cert.Domain.SANs, ","), err) } } return crt, err } // getValidDomains checks if given domain is allowed to generate a ACME certificate and return it func (p *Provider) getValidDomains(ctx context.Context, domain types.Domain, wildcardAllowed bool) ([]string, error) { domains := domain.ToStrArray() if len(domains) == 0 { return nil, errors.New("unable to generate a certificate in ACME provider when no domain is given") } if strings.HasPrefix(domain.Main, "*") { if !wildcardAllowed { return nil, fmt.Errorf("unable to generate a wildcard certificate in ACME provider for domain %q from a 'Host' rule", strings.Join(domains, ",")) } if p.DNSChallenge == nil { return nil, fmt.Errorf("unable to generate a wildcard certificate in ACME provider for domain %q : ACME needs a DNSChallenge", strings.Join(domains, ",")) } if strings.HasPrefix(domain.Main, "*.*") { return nil, fmt.Errorf("unable to generate a wildcard certificate in ACME provider for domain %q : ACME does not allow '*.*' wildcard domain", strings.Join(domains, ",")) } } for _, san := range domain.SANs { if strings.HasPrefix(san, "*") { return nil, fmt.Errorf("unable to generate a certificate in ACME provider for domains %q: SAN %q can not be a wildcard domain", strings.Join(domains, ","), san) } } var cleanDomains []string for _, domain := range domains { canonicalDomain := types.CanonicalDomain(domain) cleanDomain := dns01.UnFqdn(canonicalDomain) if canonicalDomain != cleanDomain { log.FromContext(ctx).Warnf("FQDN detected, please remove the trailing dot: %s", canonicalDomain) } cleanDomains = append(cleanDomains, cleanDomain) } return cleanDomains, nil } func isDomainAlreadyChecked(domainToCheck string, existentDomains []string) bool { for _, certDomains := range existentDomains { for _, certDomain := range strings.Split(certDomains, ",") { if types.MatchDomain(domainToCheck, certDomain) { return true } } } return false }