traefik/acme/acme.go

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package acme
import (
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"context"
"crypto/tls"
"errors"
"fmt"
"io/ioutil"
fmtlog "log"
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"net"
"net/http"
"os"
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"reflect"
"strings"
"time"
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"github.com/BurntSushi/ty/fun"
"github.com/cenk/backoff"
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"github.com/containous/flaeg"
"github.com/containous/mux"
"github.com/containous/staert"
"github.com/containous/traefik/cluster"
"github.com/containous/traefik/log"
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acmeprovider "github.com/containous/traefik/provider/acme"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/tls/generate"
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"github.com/containous/traefik/types"
"github.com/eapache/channels"
acme "github.com/xenolf/lego/acmev2"
"github.com/xenolf/lego/providers/dns"
)
var (
// OSCPMustStaple enables OSCP stapling as from https://github.com/xenolf/lego/issues/270
OSCPMustStaple = false
)
// ACME allows to connect to lets encrypt and retrieve certs
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// Deprecated Please use provider/acme/Provider
type ACME struct {
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Email string `description:"Email address used for registration"`
Domains []types.Domain `description:"SANs (alternative domains) to each main domain using format: --acme.domains='main.com,san1.com,san2.com' --acme.domains='main.net,san1.net,san2.net'"`
Storage string `description:"File or key used for certificates storage."`
StorageFile string // deprecated
OnDemand bool `description:"Enable on demand certificate generation. This will request a certificate from Let's Encrypt during the first TLS handshake for a hostname that does not yet have a certificate."` //deprecated
OnHostRule bool `description:"Enable certificate generation on frontends Host rules."`
CAServer string `description:"CA server to use."`
EntryPoint string `description:"Entrypoint to proxy acme challenge to."`
DNSChallenge *acmeprovider.DNSChallenge `description:"Activate DNS-01 Challenge"`
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HTTPChallenge *acmeprovider.HTTPChallenge `description:"Activate HTTP-01 Challenge"`
DNSProvider string `description:"Activate DNS-01 Challenge (Deprecated)"` // deprecated
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DelayDontCheckDNS flaeg.Duration `description:"Assume DNS propagates after a delay in seconds rather than finding and querying nameservers."` // deprecated
ACMELogging bool `description:"Enable debug logging of ACME actions."`
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client *acme.Client
defaultCertificate *tls.Certificate
store cluster.Store
challengeHTTPProvider *challengeHTTPProvider
checkOnDemandDomain func(domain string) bool
jobs *channels.InfiniteChannel
TLSConfig *tls.Config `description:"TLS config in case wildcard certs are used"`
dynamicCerts *safe.Safe
}
func (a *ACME) init() error {
if a.ACMELogging {
acme.Logger = fmtlog.New(os.Stderr, "legolog: ", fmtlog.LstdFlags)
} else {
acme.Logger = fmtlog.New(ioutil.Discard, "", 0)
}
// no certificates in TLS config, so we add a default one
cert, err := generate.DefaultCertificate()
if err != nil {
return err
}
a.defaultCertificate = cert
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a.jobs = channels.NewInfiniteChannel()
return nil
}
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// AddRoutes add routes on internal router
func (a *ACME) AddRoutes(router *mux.Router) {
router.Methods(http.MethodGet).
Path(acme.HTTP01ChallengePath("{token}")).
Handler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
if a.challengeHTTPProvider == nil {
rw.WriteHeader(http.StatusNotFound)
return
}
vars := mux.Vars(req)
if token, ok := vars["token"]; ok {
domain, _, err := net.SplitHostPort(req.Host)
if err != nil {
log.Debugf("Unable to split host and port: %v. Fallback to request host.", err)
domain = req.Host
}
tokenValue := a.challengeHTTPProvider.getTokenValue(token, domain)
if len(tokenValue) > 0 {
rw.WriteHeader(http.StatusOK)
rw.Write(tokenValue)
return
}
}
rw.WriteHeader(http.StatusNotFound)
}))
}
// CreateClusterConfig creates a tls.config using ACME configuration in cluster mode
func (a *ACME) CreateClusterConfig(leadership *cluster.Leadership, tlsConfig *tls.Config, certs *safe.Safe, checkOnDemandDomain func(domain string) bool) error {
err := a.init()
if err != nil {
return err
}
if len(a.Storage) == 0 {
return errors.New("Empty Store, please provide a key for certs storage")
}
a.checkOnDemandDomain = checkOnDemandDomain
a.dynamicCerts = certs
tlsConfig.Certificates = append(tlsConfig.Certificates, *a.defaultCertificate)
tlsConfig.GetCertificate = a.getCertificate
a.TLSConfig = tlsConfig
listener := func(object cluster.Object) error {
account := object.(*Account)
account.Init()
if !leadership.IsLeader() {
a.client, err = a.buildACMEClient(account)
if err != nil {
log.Errorf("Error building ACME client %+v: %s", object, err.Error())
}
}
return nil
}
datastore, err := cluster.NewDataStore(
leadership.Pool.Ctx(),
staert.KvSource{
Store: leadership.Store,
Prefix: a.Storage,
},
&Account{},
listener)
if err != nil {
return err
}
a.store = datastore
ticker := time.NewTicker(24 * time.Hour)
leadership.Pool.AddGoCtx(func(ctx context.Context) {
log.Info("Starting ACME renew job...")
defer log.Info("Stopped ACME renew job...")
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for {
select {
case <-ctx.Done():
return
case <-ticker.C:
a.renewCertificates()
}
}
})
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leadership.AddListener(a.leadershipListener)
return nil
}
func (a *ACME) leadershipListener(elected bool) error {
if elected {
_, err := a.store.Load()
if err != nil {
return err
}
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transaction, object, err := a.store.Begin()
if err != nil {
return err
}
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account := object.(*Account)
account.Init()
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var needRegister bool
if account == nil || len(account.Email) == 0 {
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domainsCerts := DomainsCertificates{Certs: []*DomainsCertificate{}}
if account != nil {
domainsCerts = account.DomainsCertificate
}
account, err = NewAccount(a.Email, domainsCerts.Certs)
if err != nil {
return err
}
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needRegister = true
}
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a.client, err = a.buildACMEClient(account)
if err != nil {
return err
}
if needRegister {
// New users will need to register; be sure to save it
log.Debug("Register...")
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reg, err := a.client.Register(true)
if err != nil {
return err
}
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account.Registration = reg
}
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err = transaction.Commit(account)
if err != nil {
return err
}
a.retrieveCertificates()
a.renewCertificates()
a.runJobs()
}
return nil
}
func (a *ACME) getCertificate(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
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domain := types.CanonicalDomain(clientHello.ServerName)
account := a.store.Get().(*Account)
if providedCertificate := a.getProvidedCertificate(domain); providedCertificate != nil {
return providedCertificate, nil
}
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if domainCert, ok := account.DomainsCertificate.getCertificateForDomain(domain); ok {
log.Debugf("ACME got domain cert %s", domain)
return domainCert.tlsCert, nil
}
if a.OnDemand {
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if a.checkOnDemandDomain != nil && !a.checkOnDemandDomain(domain) {
return nil, nil
}
return a.loadCertificateOnDemand(clientHello)
}
log.Debugf("No certificate found or generated for %s", domain)
return nil, nil
}
func (a *ACME) retrieveCertificates() {
a.jobs.In() <- func() {
log.Info("Retrieving ACME certificates...")
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a.deleteUnnecessaryDomains()
for i := 0; i < len(a.Domains); i++ {
domain := a.Domains[i]
// check if cert isn't already loaded
account := a.store.Get().(*Account)
if _, exists := account.DomainsCertificate.exists(domain); !exists {
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var domains []string
domains = append(domains, domain.Main)
domains = append(domains, domain.SANs...)
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domains, err := a.getValidDomains(domains, true)
if err != nil {
log.Errorf("Error validating ACME certificate for domain %q: %s", domains, err)
continue
}
certificateResource, err := a.getDomainsCertificates(domains)
if err != nil {
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log.Errorf("Error getting ACME certificate for domain %q: %s", domains, err)
continue
}
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transaction, object, err := a.store.Begin()
if err != nil {
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log.Errorf("Error creating ACME store transaction from domain %q: %s", domain, err)
continue
}
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account = object.(*Account)
_, err = account.DomainsCertificate.addCertificateForDomains(certificateResource, domain)
if err != nil {
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log.Errorf("Error adding ACME certificate for domain %q: %s", domains, err)
continue
}
if err = transaction.Commit(account); err != nil {
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log.Errorf("Error Saving ACME account %+v: %s", account, err)
continue
}
}
}
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log.Info("Retrieved ACME certificates")
}
}
func (a *ACME) renewCertificates() {
a.jobs.In() <- func() {
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log.Info("Testing certificate renew...")
account := a.store.Get().(*Account)
for _, certificateResource := range account.DomainsCertificate.Certs {
if certificateResource.needRenew() {
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log.Infof("Renewing certificate from LE : %+v", certificateResource.Domains)
renewedACMECert, err := a.renewACMECertificate(certificateResource)
if err != nil {
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log.Errorf("Error renewing certificate from LE: %v", err)
continue
}
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operation := func() error {
return a.storeRenewedCertificate(certificateResource, renewedACMECert)
}
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notify := func(err error, time time.Duration) {
log.Warnf("Renewed certificate storage error: %v, retrying in %s", err, time)
}
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ebo := backoff.NewExponentialBackOff()
ebo.MaxElapsedTime = 60 * time.Second
err = backoff.RetryNotify(safe.OperationWithRecover(operation), ebo, notify)
if err != nil {
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log.Errorf("Datastore cannot sync: %v", err)
continue
}
}
}
}
}
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func (a *ACME) renewACMECertificate(certificateResource *DomainsCertificate) (*Certificate, error) {
renewedCert, err := a.client.RenewCertificate(acme.CertificateResource{
Domain: certificateResource.Certificate.Domain,
CertURL: certificateResource.Certificate.CertURL,
CertStableURL: certificateResource.Certificate.CertStableURL,
PrivateKey: certificateResource.Certificate.PrivateKey,
Certificate: certificateResource.Certificate.Certificate,
}, true, OSCPMustStaple)
if err != nil {
return nil, err
}
log.Infof("Renewed certificate from LE: %+v", certificateResource.Domains)
return &Certificate{
Domain: renewedCert.Domain,
CertURL: renewedCert.CertURL,
CertStableURL: renewedCert.CertStableURL,
PrivateKey: renewedCert.PrivateKey,
Certificate: renewedCert.Certificate,
}, nil
}
func (a *ACME) storeRenewedCertificate(certificateResource *DomainsCertificate, renewedACMECert *Certificate) error {
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transaction, object, err := a.store.Begin()
if err != nil {
return fmt.Errorf("error during transaction initialization for renewing certificate: %v", err)
}
log.Infof("Renewing certificate in data store : %+v ", certificateResource.Domains)
account := object.(*Account)
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err = account.DomainsCertificate.renewCertificates(renewedACMECert, certificateResource.Domains)
if err != nil {
return fmt.Errorf("error renewing certificate in datastore: %v ", err)
}
log.Infof("Commit certificate renewed in data store : %+v", certificateResource.Domains)
if err = transaction.Commit(account); err != nil {
return fmt.Errorf("error saving ACME account %+v: %v", account, err)
}
oldAccount := a.store.Get().(*Account)
for _, oldCertificateResource := range oldAccount.DomainsCertificate.Certs {
if oldCertificateResource.Domains.Main == certificateResource.Domains.Main && strings.Join(oldCertificateResource.Domains.SANs, ",") == strings.Join(certificateResource.Domains.SANs, ",") && certificateResource.Certificate != renewedACMECert {
return fmt.Errorf("renewed certificate not stored: %+v", certificateResource.Domains)
}
}
log.Infof("Certificate successfully renewed in data store: %+v", certificateResource.Domains)
return nil
}
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func dnsOverrideDelay(delay flaeg.Duration) error {
var err error
if delay > 0 {
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log.Debugf("Delaying %d rather than validating DNS propagation", delay)
acme.PreCheckDNS = func(_, _ string) (bool, error) {
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time.Sleep(time.Duration(delay))
return true, nil
}
} else if delay < 0 {
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err = fmt.Errorf("invalid negative DelayBeforeCheck: %d", delay)
}
return err
}
func (a *ACME) buildACMEClient(account *Account) (*acme.Client, error) {
log.Debug("Building ACME client...")
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caServer := "https://acme-v02.api.letsencrypt.org/directory"
if len(a.CAServer) > 0 {
caServer = a.CAServer
}
client, err := acme.NewClient(caServer, account, acme.RSA4096)
if err != nil {
return nil, err
}
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if a.DNSChallenge != nil && len(a.DNSChallenge.Provider) > 0 {
log.Debugf("Using DNS Challenge provider: %s", a.DNSChallenge.Provider)
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err = dnsOverrideDelay(a.DNSChallenge.DelayBeforeCheck)
if err != nil {
return nil, err
}
var provider acme.ChallengeProvider
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provider, err = dns.NewDNSChallengeProviderByName(a.DNSChallenge.Provider)
if err != nil {
return nil, err
}
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client.ExcludeChallenges([]acme.Challenge{acme.HTTP01})
err = client.SetChallengeProvider(acme.DNS01, provider)
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} else if a.HTTPChallenge != nil && len(a.HTTPChallenge.EntryPoint) > 0 {
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log.Debug("Using HTTP Challenge provider.")
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client.ExcludeChallenges([]acme.Challenge{acme.DNS01})
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a.challengeHTTPProvider = &challengeHTTPProvider{store: a.store}
err = client.SetChallengeProvider(acme.HTTP01, a.challengeHTTPProvider)
} else {
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return nil, errors.New("ACME challenge not specified, please select HTTP or DNS Challenge")
}
if err != nil {
return nil, err
}
return client, nil
}
func (a *ACME) loadCertificateOnDemand(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
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domain := types.CanonicalDomain(clientHello.ServerName)
account := a.store.Get().(*Account)
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if certificateResource, ok := account.DomainsCertificate.getCertificateForDomain(domain); ok {
return certificateResource.tlsCert, nil
}
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certificate, err := a.getDomainsCertificates([]string{domain})
if err != nil {
return nil, err
}
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log.Debugf("Got certificate on demand for domain %s", domain)
transaction, object, err := a.store.Begin()
if err != nil {
return nil, err
}
account = object.(*Account)
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cert, err := account.DomainsCertificate.addCertificateForDomains(certificate, types.Domain{Main: domain})
if err != nil {
return nil, err
}
if err = transaction.Commit(account); err != nil {
return nil, err
}
return cert.tlsCert, nil
}
// LoadCertificateForDomains loads certificates from ACME for given domains
func (a *ACME) LoadCertificateForDomains(domains []string) {
a.jobs.In() <- func() {
log.Debugf("LoadCertificateForDomains %v...", domains)
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domains, err := a.getValidDomains(domains, false)
if err != nil {
log.Errorf("Error getting valid domain: %v", err)
return
}
operation := func() error {
if a.client == nil {
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return errors.New("ACME client still not built")
}
return nil
}
notify := func(err error, time time.Duration) {
log.Errorf("Error getting ACME client: %v, retrying in %s", err, time)
}
ebo := backoff.NewExponentialBackOff()
ebo.MaxElapsedTime = 30 * time.Second
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err = backoff.RetryNotify(safe.OperationWithRecover(operation), ebo, notify)
if err != nil {
log.Errorf("Error getting ACME client: %v", err)
return
}
account := a.store.Get().(*Account)
// Check provided certificates
uncheckedDomains := a.getUncheckedDomains(domains, account)
if len(uncheckedDomains) == 0 {
return
}
certificate, err := a.getDomainsCertificates(uncheckedDomains)
if err != nil {
log.Errorf("Error getting ACME certificates %+v : %v", uncheckedDomains, err)
return
}
log.Debugf("Got certificate for domains %+v", uncheckedDomains)
transaction, object, err := a.store.Begin()
if err != nil {
log.Errorf("Error creating transaction %+v : %v", uncheckedDomains, err)
return
}
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var domain types.Domain
if len(uncheckedDomains) > 1 {
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domain = types.Domain{Main: uncheckedDomains[0], SANs: uncheckedDomains[1:]}
} else {
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domain = types.Domain{Main: uncheckedDomains[0]}
}
account = object.(*Account)
_, err = account.DomainsCertificate.addCertificateForDomains(certificate, domain)
if err != nil {
log.Errorf("Error adding ACME certificates %+v : %v", uncheckedDomains, err)
return
}
if err = transaction.Commit(account); err != nil {
log.Errorf("Error Saving ACME account %+v: %v", account, err)
return
}
}
}
// Get provided certificate which check a domains list (Main and SANs)
// from static and dynamic provided certificates
func (a *ACME) getProvidedCertificate(domains string) *tls.Certificate {
log.Debugf("Looking for provided certificate to validate %s...", domains)
cert := searchProvidedCertificateForDomains(domains, a.TLSConfig.NameToCertificate)
if cert == nil && a.dynamicCerts != nil && a.dynamicCerts.Get() != nil {
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cert = searchProvidedCertificateForDomains(domains, a.dynamicCerts.Get().(map[string]*tls.Certificate))
}
if cert == nil {
log.Debugf("No provided certificate found for domains %s, get ACME certificate.", domains)
}
return cert
}
func searchProvidedCertificateForDomains(domain string, certs map[string]*tls.Certificate) *tls.Certificate {
// Use regex to test for provided certs that might have been added into TLSConfig
for certDomains := range certs {
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domainChecked := false
for _, certDomain := range strings.Split(certDomains, ",") {
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domainChecked = types.MatchDomain(domain, certDomain)
if domainChecked {
break
}
}
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if domainChecked {
log.Debugf("Domain %q checked by provided certificate %q", domain, certDomains)
return certs[certDomains]
}
}
return nil
}
// Get provided certificate which check a domains list (Main and SANs)
// from static and dynamic provided certificates
func (a *ACME) getUncheckedDomains(domains []string, account *Account) []string {
log.Debugf("Looking for provided certificate to validate %s...", domains)
allCerts := make(map[string]*tls.Certificate)
// Get static certificates
for domains, certificate := range a.TLSConfig.NameToCertificate {
allCerts[domains] = certificate
}
// Get dynamic certificates
if a.dynamicCerts != nil && a.dynamicCerts.Get() != nil {
for domains, certificate := range a.dynamicCerts.Get().(map[string]*tls.Certificate) {
allCerts[domains] = certificate
}
}
// Get ACME certificates
if account != nil {
for domains, certificate := range account.DomainsCertificate.toDomainsMap() {
allCerts[domains] = certificate
}
}
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// Get Configuration Domains
for i := 0; i < len(a.Domains); i++ {
allCerts[a.Domains[i].Main] = &tls.Certificate{}
for _, san := range a.Domains[i].SANs {
allCerts[san] = &tls.Certificate{}
}
}
return searchUncheckedDomains(domains, allCerts)
}
func searchUncheckedDomains(domains []string, certs map[string]*tls.Certificate) []string {
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var uncheckedDomains []string
for _, domainToCheck := range domains {
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if !isDomainAlreadyChecked(domainToCheck, certs) {
uncheckedDomains = append(uncheckedDomains, domainToCheck)
}
}
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if len(uncheckedDomains) == 0 {
log.Debugf("No ACME certificate to generate for domains %q.", domains)
} else {
log.Debugf("Domains %q need ACME certificates generation for domains %q.", domains, strings.Join(uncheckedDomains, ","))
}
return uncheckedDomains
}
func (a *ACME) getDomainsCertificates(domains []string) (*Certificate, error) {
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domains = fun.Map(types.CanonicalDomain, domains).([]string)
log.Debugf("Loading ACME certificates %s...", domains)
bundle := true
certificate, failures := a.client.ObtainCertificate(domains, bundle, nil, OSCPMustStaple)
if len(failures) > 0 {
log.Error(failures)
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return nil, fmt.Errorf("cannot obtain certificates %+v", failures)
}
log.Debugf("Loaded ACME certificates %s", domains)
return &Certificate{
Domain: certificate.Domain,
CertURL: certificate.CertURL,
CertStableURL: certificate.CertStableURL,
PrivateKey: certificate.PrivateKey,
Certificate: certificate.Certificate,
}, nil
}
func (a *ACME) runJobs() {
safe.Go(func() {
for job := range a.jobs.Out() {
function := job.(func())
function()
}
})
}
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// getValidDomains checks if given domain is allowed to generate a ACME certificate and return it
func (a *ACME) getValidDomains(domains []string, wildcardAllowed bool) ([]string, error) {
// Check if the domains array is empty or contains only one empty value
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if len(domains) == 0 || (len(domains) == 1 && len(domains[0]) == 0) {
return nil, errors.New("unable to generate a certificate when no domain is given")
}
if strings.HasPrefix(domains[0], "*") {
if !wildcardAllowed {
return nil, fmt.Errorf("unable to generate a wildcard certificate for domain %q from a 'Host' rule", strings.Join(domains, ","))
}
if a.DNSChallenge == nil && len(a.DNSProvider) == 0 {
return nil, fmt.Errorf("unable to generate a wildcard certificate for domain %q : ACME needs a DNSChallenge", strings.Join(domains, ","))
}
if strings.HasPrefix(domains[0], "*.*") {
return nil, fmt.Errorf("unable to generate a wildcard certificate for domain %q : ACME does not allow '*.*' wildcard domain", strings.Join(domains, ","))
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}
}
for _, san := range domains[1:] {
if strings.HasPrefix(san, "*") {
return nil, fmt.Errorf("unable to generate a certificate for domains %q: SANs can not be a wildcard domain", strings.Join(domains, ","))
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}
}
domains = fun.Map(types.CanonicalDomain, domains).([]string)
return domains, nil
}
func isDomainAlreadyChecked(domainToCheck string, existentDomains map[string]*tls.Certificate) bool {
for certDomains := range existentDomains {
for _, certDomain := range strings.Split(certDomains, ",") {
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if types.MatchDomain(domainToCheck, certDomain) {
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return true
}
}
}
return false
}
// deleteUnnecessaryDomains deletes from the configuration :
// - Duplicated domains
// - Domains which are checked by wildcard domain
func (a *ACME) deleteUnnecessaryDomains() {
var newDomains []types.Domain
for idxDomainToCheck, domainToCheck := range a.Domains {
keepDomain := true
for idxDomain, domain := range a.Domains {
if idxDomainToCheck == idxDomain {
continue
}
if reflect.DeepEqual(domain, domainToCheck) {
if idxDomainToCheck > idxDomain {
log.Warnf("The domain %v is duplicated in the configuration but will be process by ACME only once.", domainToCheck)
keepDomain = false
}
break
}
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var newDomainsToCheck []string
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// Check if domains can be validated by the wildcard domain
domainsMap := make(map[string]*tls.Certificate)
domainsMap[domain.Main] = &tls.Certificate{}
if len(domain.SANs) > 0 {
domainsMap[strings.Join(domain.SANs, ",")] = &tls.Certificate{}
}
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for _, domainProcessed := range domainToCheck.ToStrArray() {
if idxDomain < idxDomainToCheck && isDomainAlreadyChecked(domainProcessed, domainsMap) {
// The domain is duplicated in a CN
log.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, "*") && types.MatchDomain(domainProcessed, domain.Main) {
// Check if a wildcard can validate the domain
log.Warnf("Domain %q will not be processed by ACME provider because it is validated by the wildcard %q", domainProcessed, domain.Main)
continue
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}
newDomainsToCheck = append(newDomainsToCheck, domainProcessed)
}
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// 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
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}
domainToCheck.Set(newDomainsToCheck)
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}
if keepDomain {
newDomains = append(newDomains, domainToCheck)
}
}
a.Domains = newDomains
}