Add Let's Encrypt HTTP Challenge

2018-01-15 16:04:05 +01:00 · 2018-01-15 16:04:05 +01:00 · 3e439cc39b
commit 3e439cc39b
parent 56c0634918
22 changed files with 598 additions and 157 deletions
--- a/.gitignore
+++ b/.gitignore
@ -11,4 +11,4 @@
 *.log
 *.exe
 .DS_Store
-/example/acme/acme.json
+/examples/acme/acme.json
--- a/acme/account.go
+++ b/acme/account.go
@ -24,6 +24,7 @@ type Account struct {
 	PrivateKey         []byte
 	DomainsCertificate DomainsCertificates
 	ChallengeCerts     map[string]*ChallengeCert
+	HTTPChallenge      map[string]map[string][]byte
 }

 // ChallengeCert stores a challenge certificate
--- a/acme/acme.go
+++ b/acme/acme.go
@ -7,6 +7,8 @@ import (
 	"fmt"
 	"io/ioutil"
 	fmtlog "log"
+	"net"
+	"net/http"
 	"os"
 	"regexp"
 	"strings"
@ -14,6 +16,8 @@ import (

 	"github.com/BurntSushi/ty/fun"
 	"github.com/cenk/backoff"
+	"github.com/containous/flaeg"
+	"github.com/containous/mux"
 	"github.com/containous/staert"
 	"github.com/containous/traefik/cluster"
 	"github.com/containous/traefik/log"
@ -33,25 +37,39 @@ var (

 // ACME allows to connect to lets encrypt and retrieve certs
 type ACME struct {
-	Email               string   `description:"Email address used for registration"`
-	Domains             []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. This will request a certificate from Let's Encrypt during the first TLS handshake for a hostname that does not yet have a certificate."`
-	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."`
-	DNSProvider         string   `description:"Use a DNS based challenge provider rather than HTTPS."`
-	DelayDontCheckDNS   int      `description:"Assume DNS propagates after a delay in seconds rather than finding and querying nameservers."`
-	ACMELogging         bool     `description:"Enable debug logging of ACME actions."`
-	client              *acme.Client
-	defaultCertificate  *tls.Certificate
-	store               cluster.Store
-	challengeProvider   *challengeProvider
-	checkOnDemandDomain func(domain string) bool
-	jobs                *channels.InfiniteChannel
-	TLSConfig           *tls.Config `description:"TLS config in case wildcard certs are used"`
-	dynamicCerts        *safe.Safe
+	Email                 string         `description:"Email address used for registration"`
+	Domains               []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          *DNSChallenge  `description:"Activate DNS-01 Challenge"`
+	HTTPChallenge         *HTTPChallenge `description:"Activate HTTP-01 Challenge"`
+	DNSProvider           string         `description:"Use a DNS-01 acme challenge rather than TLS-SNI-01 challenge."`                                // deprecated
+	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."`
+	client                *acme.Client
+	defaultCertificate    *tls.Certificate
+	store                 cluster.Store
+	challengeTLSProvider  *challengeTLSProvider
+	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
+}
+
+// DNSChallenge contains DNS challenge Configuration
+type DNSChallenge struct {
+	Provider         string         `description:"Use a DNS-01 based challenge provider rather than HTTPS."`
+	DelayBeforeCheck flaeg.Duration `description:"Assume DNS propagates after a delay in seconds rather than finding and querying nameservers."`
+}
+
+// HTTPChallenge contains HTTP challenge Configuration
+type HTTPChallenge struct {
+	EntryPoint string `description:"HTTP challenge EntryPoint"`
 }

 //Domains parse []Domain
@ -107,15 +125,39 @@ func (a *ACME) init() error {
 		return err
 	}
 	a.defaultCertificate = cert
-	// TODO: to remove in the futurs
-	if len(a.StorageFile) > 0 && len(a.Storage) == 0 {
-		log.Warn("ACME.StorageFile is deprecated, use ACME.Storage instead")
-		a.Storage = a.StorageFile
-	}
+
 	a.jobs = channels.NewInfiniteChannel()
 	return nil
 }

+// 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()
@ -155,7 +197,7 @@ func (a *ACME) CreateClusterConfig(leadership *cluster.Leadership, tlsConfig *tl
 	}

 	a.store = datastore
-	a.challengeProvider = &challengeProvider{store: a.store}
+	a.challengeTLSProvider = &challengeTLSProvider{store: a.store}

 	ticker := time.NewTicker(24 * time.Hour)
 	leadership.Pool.AddGoCtx(func(ctx context.Context) {
@ -171,69 +213,69 @@ func (a *ACME) CreateClusterConfig(leadership *cluster.Leadership, tlsConfig *tl
 		}
 	})

-	leadership.AddListener(func(elected bool) error {
-		if elected {
-			_, err := a.store.Load()
+	leadership.AddListener(a.leadershipListener)
+	return nil
+}
+
+func (a *ACME) leadershipListener(elected bool) error {
+	if elected {
+		_, err := a.store.Load()
+		if err != nil {
+			return err
+		}
+		transaction, object, err := a.store.Begin()
+		if err != nil {
+			return err
+		}
+		account := object.(*Account)
+		account.Init()
+		var needRegister bool
+		if account == nil || len(account.Email) == 0 {
+			account, err = NewAccount(a.Email)
 			if err != nil {
 				return err
 			}
-			transaction, object, err := a.store.Begin()
+			needRegister = true
+		}
+		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...")
+			reg, err := a.client.Register()
 			if err != nil {
 				return err
 			}
-			account := object.(*Account)
-			account.Init()
-			var needRegister bool
-			if account == nil || len(account.Email) == 0 {
-				account, err = NewAccount(a.Email)
-				if err != nil {
-					return err
-				}
-				needRegister = true
-			}
+			account.Registration = reg
+		}
+		// The client has a URL to the current Let's Encrypt Subscriber
+		// Agreement. The user will need to agree to it.
+		log.Debug("AgreeToTOS...")
+		err = a.client.AgreeToTOS()
+		if err != nil {
+			log.Debug(err)
+			// Let's Encrypt Subscriber Agreement renew ?
+			reg, err := a.client.QueryRegistration()
 			if err != nil {
 				return err
 			}
-			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...")
-				reg, err := a.client.Register()
-				if err != nil {
-					return err
-				}
-				account.Registration = reg
-			}
-			// The client has a URL to the current Let's Encrypt Subscriber
-			// Agreement. The user will need to agree to it.
-			log.Debug("AgreeToTOS...")
+			account.Registration = reg
 			err = a.client.AgreeToTOS()
 			if err != nil {
-				// Let's Encrypt Subscriber Agreement renew ?
-				reg, err := a.client.QueryRegistration()
-				if err != nil {
-					return err
-				}
-				account.Registration = reg
-				err = a.client.AgreeToTOS()
-				if err != nil {
-					log.Errorf("Error sending ACME agreement to TOS: %+v: %s", account, err.Error())
-				}
+				log.Errorf("Error sending ACME agreement to TOS: %+v: %s", account, err.Error())
 			}
-			err = transaction.Commit(account)
-			if err != nil {
-				return err
-			}
-
-			a.retrieveCertificates()
-			a.renewCertificates()
-			a.runJobs()
 		}
-		return nil
-	})
+		err = transaction.Commit(account)
+		if err != nil {
+			return err
+		}
+
+		a.retrieveCertificates()
+		a.renewCertificates()
+		a.runJobs()
+	}
 	return nil
 }

@ -253,7 +295,7 @@ func (a *ACME) CreateLocalConfig(tlsConfig *tls.Config, certs *safe.Safe, checkO
 	a.TLSConfig = tlsConfig
 	localStore := NewLocalStore(a.Storage)
 	a.store = localStore
-	a.challengeProvider = &challengeProvider{store: a.store}
+	a.challengeTLSProvider = &challengeTLSProvider{store: a.store}

 	var needRegister bool
 	var account *Account
@ -337,7 +379,7 @@ func (a *ACME) getCertificate(clientHello *tls.ClientHelloInfo) (*tls.Certificat
 		return providedCertificate, nil
 	}

-	if challengeCert, ok := a.challengeProvider.getCertificate(domain); ok {
+	if challengeCert, ok := a.challengeTLSProvider.getCertificate(domain); ok {
 		log.Debugf("ACME got challenge %s", domain)
 		return challengeCert, nil
 	}
@ -472,16 +514,16 @@ func (a *ACME) storeRenewedCertificate(account *Account, certificateResource *Do
 	return nil
 }

-func dnsOverrideDelay(delay int) error {
+func dnsOverrideDelay(delay flaeg.Duration) error {
 	var err error
 	if delay > 0 {
-		log.Debugf("Delaying %d seconds rather than validating DNS propagation", delay)
+		log.Debugf("Delaying %d rather than validating DNS propagation", delay)
 		acme.PreCheckDNS = func(_, _ string) (bool, error) {
-			time.Sleep(time.Duration(delay) * time.Second)
+			time.Sleep(time.Duration(delay))
 			return true, nil
 		}
 	} else if delay < 0 {
-		err = fmt.Errorf("invalid negative DelayDontCheckDNS: %d", delay)
+		err = fmt.Errorf("invalid negative DelayBeforeCheck: %d", delay)
 	}
 	return err
 }
@ -497,25 +539,29 @@ func (a *ACME) buildACMEClient(account *Account) (*acme.Client, error) {
 		return nil, err
 	}

-	if len(a.DNSProvider) > 0 {
-		log.Debugf("Using DNS Challenge provider: %s", a.DNSProvider)
+	if a.DNSChallenge != nil && len(a.DNSChallenge.Provider) > 0 {
+		log.Debugf("Using DNS Challenge provider: %s", a.DNSChallenge.Provider)

-		err = dnsOverrideDelay(a.DelayDontCheckDNS)
+		err = dnsOverrideDelay(a.DNSChallenge.DelayBeforeCheck)
 		if err != nil {
 			return nil, err
 		}

 		var provider acme.ChallengeProvider
-		provider, err = dns.NewDNSChallengeProviderByName(a.DNSProvider)
+		provider, err = dns.NewDNSChallengeProviderByName(a.DNSChallenge.Provider)
 		if err != nil {
 			return nil, err
 		}

 		client.ExcludeChallenges([]acme.Challenge{acme.HTTP01, acme.TLSSNI01})
 		err = client.SetChallengeProvider(acme.DNS01, provider)
+	} else if a.HTTPChallenge != nil && len(a.HTTPChallenge.EntryPoint) > 0 {
+		client.ExcludeChallenges([]acme.Challenge{acme.DNS01, acme.TLSSNI01})
+		a.challengeHTTPProvider = &challengeHTTPProvider{store: a.store}
+		err = client.SetChallengeProvider(acme.HTTP01, a.challengeHTTPProvider)
 	} else {
 		client.ExcludeChallenges([]acme.Challenge{acme.HTTP01, acme.DNS01})
-		err = client.SetChallengeProvider(acme.TLSSNI01, a.challengeProvider)
+		err = client.SetChallengeProvider(acme.TLSSNI01, a.challengeTLSProvider)
 	}

 	if err != nil {
@ -659,7 +705,7 @@ func (a *ACME) getDomainsCertificates(domains []string) (*Certificate, error) {
 	certificate, failures := a.client.ObtainCertificate(domains, bundle, nil, OSCPMustStaple)
 	if len(failures) > 0 {
 		log.Error(failures)
-		return nil, fmt.Errorf("Cannot obtain certificates %s+v", failures)
+		return nil, fmt.Errorf("cannot obtain certificates %+v", failures)
 	}
 	log.Debugf("Loaded ACME certificates %s", domains)
 	return &Certificate{
--- a/acme/acme_example.json
+++ b/acme/acme_example.json
@ -0,0 +1,43 @@
+{
+  "Email": "test@traefik.io",
+  "Registration": {
+    "body": {
+      "resource": "reg",
+      "id": 3,
+      "key": {
+        "kty": "RSA",
+        "n": "y5a71suIqvEtovDmDVQ3SSNagk5IVCFI_TvqWpEXSrdbcDE2C-PTEtEUJuLkYwygcpiWYbPmXgdS628vQCw5Uo4DeDyHiuysJOWBLaWow3p9goOdhnPbGBq0liIR9xXyRoctdipVk8UiO9scWsu4jMBM3sMr7_yBWPfYYiLEQmZGFO3iE7Oqr55h_kncHIj5lUQY1j_jkftqxlxUB5_0quyJ7l915j5QY--eY7h4GEhRvx0TlUpi-CnRtRblGeDDDilXZD6bQN2962WdKecsmRaYx-ttLz6jCPXz2VDJRWNcIS501ne2Zh3hzw_DS6IRd2GIia1Wg4sisi9epC9sumXPHi6xzR6-_i_nsFjdtTkUcV8HmorOYoc820KQVZaLScxa8e7-ixpOd6mr6AIbEf7dBAkb9f_iK3GwpqKD8yNcaj1EQgNSyJSjnKSulXI_GwkGnuXe00Qpb1a8ha5Z8yWg7XmZZnJyAZrmK60RfwRNQ1rO5ioerNUBJ2KYTYNzVjBdob9Ug6Cjh4bEKNNjqcbjQ50_Z97Vw40xzpDQ_fYllc6n92eSuv6olxFJTmK7EhHuanDzITngaqei3zL9RwQ7P-1jfEZ03qmGrQYYqXcsS46PQ8cE-frzY2mKp16pRNCG7-03gKVGV0JHyW1aYbevNUk7OumCAXhC2YOigBk",
+        "e": "AQAB"
+      },
+      "contact": [
+        "mailto:test@traefik.io"
+      ],
+      "agreement": "http://boulder:4000/terms/v1"
+    },
+    "uri": "http://127.0.0.1:4000/acme/reg/3",
+    "new_authzr_uri": "http://127.0.0.1:4000/acme/new-authz",
+    "terms_of_service": "http://boulder:4000/terms/v1"
+  },
+  "PrivateKey": "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",
+  "DomainsCertificate": {
+    "Certs": [
+      {
+        "Domains": {
+          "Main": "local1.com",
+          "SANs": [
+            "test1.local1.com",
+            "test2.local1.com"
+          ]
+        },
+        "Certificate": {
+          "Domain": "local1.com",
+          "CertURL": "http://127.0.0.1:4000/acme/cert/ffc4f3f14def9ee6ec6a0522b5c0baa3379d",
+          "CertStableURL": "",
+          "PrivateKey": "LS0tLS1CRUdJTiBSU0EgUFJJVkFURSBLRVktLS0tLQpNSUlKS1FJQkFBS0NBZ0VBdVNoTTR4enF6cE5YcFNaNnAvZnQrRmt5VmgyK1BSZXJUelV0OERRSng2UkVjQS9FCnN2RnNIVmNOSkZMS2twYTNlOEd3SUZBakJQNnJPK3hoR1JjWlJrdENON1gyOW5LZFhGbHZkYzJxd0hyTFF5WWkKTTB3ODhTck41VERiNi96TWU2dTB0dERiYWtDbDd6ZEJKUXJ6a1h5ZU1MeVkzTUs3aVkrMHpwL2JqMVhvbk5DdQpaQStkZ3hsMVNrV01DVUYvQk9HNWFyT1hwb0x4S0dQWGdzV3hOTVNLVmJKSHczL3ZqNTViZU92Um5lT3BNWlhvCmMwOWpZT3VBakNka1Z5czBSWHJLNWNCRDRMbVRXdnN4MFdTK2VMVHlGTTdQTHVZM3lEWkNNWEhjVmlqRHhnbFMKYjB1ZVRQcGFUWEQwYkxqZ0RNOUVEdE15ZEJzMUNPWlpPWG9ickN5Q2I1eWxTOFdVd1NzVXM1UldxZnlVbnAvcgpSNGx2c2RZOWRVZjRPdkNMVnJvWWk5NWFGc1Zxa0xLOExuL0Eyc3kxYWlDTnR4RmpKOXRXbWU0V0NhdzRoU0YvCkR4NWVNNWNYR2JSYXduVlZJQlZXeHhzNTBPMFJlUWRvbXBQZEFNS1RDWk9SRmxYaDdOWTdxQVdWRGtpdzhyam8Kekd3Ni9XdjlOR3hTNTliKzc0YVAxcjBxOTZ2RS9Rdi8zTCtjbjhiN0lBLytPYmFKdzhIT3RGbXc4RjBxQkN3MAprYWVVSloxb1JueGFYQUo4RHhHREpFOVdNUzh0QmJtVm16YkxoRkMzeDdVc0xGeTBrSzh1SFBFT3dQb2NKNUFUCkE1UHBvclNEMmFleHA0Z3VqYVp5c1JManpmY0dnaTdva0JFNlZVNWVqRE1iYS9lNERQNEJQUVg5VmtVQ0F3RUEKQVFLQ0FnQmZjMWdYcUp1ZmZMT3REcVlpbXh4UmIrSVVKT2NpWldaSndmZDVvY244NGtEcHFDZFZ2RUZvNnF4NgpzamQ5MURhb2xOUHdCSC9aSGxRMTR3aTNQNEluQzdzS0wwTXVEeTN5SXFUa0RPOWVwSzdPWWdVMWZyTFgvS0lCCjZlc2x2Ny9HYldFTzhhSjdKdktqM0U4NEFtcEg4UDgzenJIYTlJUnJTT3NEcmNNcEpEZHpSOXp1OW1IVDZMYmYKWC9UdC9KYTNkSW42YUxUZ0FSYkRKSjAvN0J3TFFOcXpqT0dUOWdzUWRhbGdMK2x5eEo4L1ViRndhRmVwNmgzdApvbzBHcHQ0ZWgwdTdueDhlNVd3Q2RnWmJsTnpnS3grMC9Gd3dLRHhQZVRFc2ZpOEJONmlkR2NjbVdzd3prTWdtCnJmbERaeGNSWTNRSlZIVHBCL0dTTWZXRFBPQ3dRdGltQk1WN3kxM2hPMTdPWXpSNDBMZnpUalJBbmtna2V2eWYKcFowb3dLR3o4QS9haHhRWWJmYVQ5VEhXV0wrYUpYeUhFanBKckp5aTg3UExVbzhsOFVydU56MDRWNXpLOFJPbgo2cG9EWmVtbm1EYWRlU09pK3hZRWlGT1NwSXNWbzlpcm9jUGFKN2YzYWpiNUU4RHpuN1o1MmhzL2R6akpLcFZJCm5mVDFkUU9SZEowSXRUNlRlQ2RTL0dpS25IS1RtNjR2T21IbmlJcm8rUGRhUmFjV0IrTUJ0VytRd0cyUStyRGkKc3g4NlpQbHRpTVpLMDZ5TVlyVHZUdGk2aFVGaUY5cWh4b3RGazdNQkNrZlIwYUVhaUREQUpKNm1jb1lpRUQ2QgpBVGJhVmpVaGNaUiswYkRST25PN0ozRk5rZmx3K2dMaVhvcXFRRW9pU2ZWb2h5SWY3UUtDQVFFQThjYTM5K0g4CjN3L2Qrcm0yUGNhM0RMQnBYaWU4Z3ZYcGpjazVYSkpvSGVmbnJjZWQrcFpXaTZEYncwYld0MEdtYkxmVjJNSlAKV2I1aTZzSXhmdkN3YlFqbHY0UnExMVA5ZEswT3poMnVpKzZ6cXVBMG5YTVcrN0lJS0cvdDhmS2NJZGRRNnRGcwpFclFVTFBDak56ODA2cHBiSlhPRmVvMW1BK293TGhHNlA3dDhCdlZHSk1NaTNxejNlSUNuVVE2eDNFY01ITXNuClhrM21DUzI1WUZaNk96cytFK254cGVraTAzZmQwblp3UE1jdElHZys1c3hleE9zREsrTHlvb2FqQnc5N0oyUzIKcUNNWXFtT0tLcmxEQ3Y1WmQ4dlZLN3hXVmpKRVhGTTNMZ2pieHBRcCtuVXNVVWxwS01LOVlGS0lRREl0RU9aMApWcWExTXJaOElzN1l5d0tDQVFFQXhBemZIa2pIVGlvTHdZbG5EcEk0MWlOTDh5Y0ZBallrTC94dWhPU2tlVkE4CjdRWDZPZUpDekR3Z0FUYXVqOWR6Y0wwby9yTndWV0xWcnQ3OXk3YnJvVDdFREZKWVNTY25GRXNMTlVWSXRncGkKckNSUXJTL1F2TkVGTmE5K0pRc1dmYkdBNHdIUTFaSjI4MFp1cWMvNlEyUi9kZVh3cUZBQVBHN2NIcEhHWlR6ZQoyRmFRUHFLRkV4WlEyZkpvRys0SVBRNHVQVERybXlGMmVUWXk2T3BaaDBHbWJRYlVTa1dFWDlQRmF1cHJIWVdGCk8wK25DaVVPNVRaMFZoaGR2dUNKMWdPclZHYzhBUlJtUVZ1aUNEWTZCaGlvVTU0ZmZsSXlDTXZ5a3MwcmRXZ3MKWVJ2TmN4TXNlRGJpTDRKSURkMHhiN1d4VUdmVjRVNHZPMks5Vms1N0x3S0NBUUVBMkd1eE1jcXd1RnRUc0tPYwpaaUFDcXZFZTRKRmhSVGtySHlnSW1MelZSaS9ZU3M1c3MycnZmWDA0T3N5bVZ0UUZUVHdoeUMzbktjWXFkVW52ClZGblBFMHJyblV2Qzk0elBUQ205SHZPaTBzK1JORndOdlFMUWgrME5NR1ZBOFZyaU44aXRQZ1RJWU5XaFdianQKNFA1TE45V0QwVHBmT1J4cFBRZmNxT0JsZjdjcmhtNzNvdUNwemZtMmE3OStCaWpKUFF5NzR1cFhDeXRmeHNlUApNSlU0Uk56NjdJaDFMclpKM2xGbDFvYitZT2xKazhDOHpZd1RLT0hWck9zeGxobyt4SXN2Q2t3MDFMelZ6Mi9hCnRmT3Y5NTlHSnQzbXE0ZWpJUFZPQy9iUlpmdTMvMEdSY2dpQTZ5SnpaM0VxWTVaOU1EbTU3VzdjcE5RRlRxZmEKNXEyUmtRS0NBUUErNGhZSzQ3TXg2aUNkTWxKaEJSdS82OUJucktOWm96NFdPalRFNFlXejk3MmpGU0Mrd2tsRQpzeUJjNDBvNGp4WFRHb2wwc04rZU03WndnY3dNTko3OXVHRXZ4cFhVMlA4YTdqc3BHaEVKZXVsTlo5U015R0orCnZkaWE4TEJZZDJiK2FCbjhOay9pd1Rqd0xTNC92NXI1Vk5uaFdpRElDK2tYZVVPWGRwQ1pWbDN3TEV2V0cxRHQKMzJHTmxzZzM5VENsVE5BZUJudjc1VTdYOEQrQ0gvRVpoa0E0aGxFL2hXN0JRZTczclRzd1creHhLc3BjWWFpVwpjdEg3NzVMYUw3Rm1lUVRTYk01OVZpcTZXZ2J0OVY3Rko5R09DSkQzZHF2ZjBITDlEVndjSzQ3WWt3OWlFc3RYCnY5cnEvREhhYUpGNzBGNlFlTTNNbDhSa212WTZJYkEzQW9JQkFRRGt6RmZLeG9HQ3dWUDlua3k4NmFQSjFvd2kKc2FDZEx6RjRWTENRZzkrUXJITzEyY0p5MFFQUnJ2cUQyMGp1cDFlOWJhWVZzbkdYc1FZTFg2NVR6UzJSSCtlSAp6S0NPTTdnMVE3djMxNWpjMDMvN1lQck4rb3RrV0VBOUkyaDZjUE1vY3c0aERTNk02OFlxQVlKTS9RclVhenZhCnhBTFJaZEVkQW1xWDA4VHhuY1hRUEVxYkk0ZnlSZ2pVM1BYR3RRaFFFbERpR2kwbThjQTJNTXdsR1RmbTdOSXgKaENjZ2ZkL296TEp2VUhiMkxLRi82cXEySmJVRHlOMkVoK0xSZUJjdnp6Y1grZE5MdGQxY0Uvcm1SM2hMbWxmNgo3KzRpTVMxK0t1eWV3VlJVUEE1c1F1aUYyVUVoeEs1MUpZK1FpOG9HbERKdGRrOXB3QlZNN1F0WW9KVEwKLS0tLS1FTkQgUlNBIFBSSVZBVEUgS0VZLS0tLS0K",
+          "Certificate": "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"
+        }
+      }
+    ]
+  },
+  "ChallengeCerts": {}
+}
--- a/acme/acme_test.go
+++ b/acme/acme_test.go
@ -267,7 +267,7 @@ cijFkALeQp/qyeXdFld2v9gUN3eCgljgcl0QweRoIc=---`)
 }`))
 	}))
 	defer ts.Close()
-	a := ACME{DNSProvider: "manual", DelayDontCheckDNS: 10, CAServer: ts.URL}
+	a := ACME{DNSChallenge: &DNSChallenge{Provider: "manual", DelayBeforeCheck: 10}, CAServer: ts.URL}

 	client, err := a.buildACMEClient(account)
 	if err != nil {
--- a/acme/challenge_http_provider.go
+++ b/acme/challenge_http_provider.go
@ -0,0 +1,92 @@
+package acme
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/cenk/backoff"
+	"github.com/containous/traefik/cluster"
+	"github.com/containous/traefik/log"
+	"github.com/containous/traefik/safe"
+	"github.com/xenolf/lego/acme"
+)
+
+var _ acme.ChallengeProviderTimeout = (*challengeHTTPProvider)(nil)
+
+type challengeHTTPProvider struct {
+	store cluster.Store
+	lock  sync.RWMutex
+}
+
+func (c *challengeHTTPProvider) getTokenValue(token, domain string) []byte {
+	log.Debugf("Looking for an existing ACME challenge for token %v...", token)
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+	account := c.store.Get().(*Account)
+	if account.HTTPChallenge == nil {
+		return []byte{}
+	}
+	var result []byte
+	operation := func() error {
+		var ok bool
+		if result, ok = account.HTTPChallenge[token][domain]; !ok {
+			return fmt.Errorf("cannot find challenge for token %v", token)
+		}
+		return nil
+	}
+	notify := func(err error, time time.Duration) {
+		log.Errorf("Error getting challenge for token retrying in %s", time)
+	}
+	ebo := backoff.NewExponentialBackOff()
+	ebo.MaxElapsedTime = 60 * time.Second
+	err := backoff.RetryNotify(safe.OperationWithRecover(operation), ebo, notify)
+	if err != nil {
+		log.Errorf("Error getting challenge for token: %v", err)
+		return []byte{}
+	}
+	return result
+}
+
+func (c *challengeHTTPProvider) Present(domain, token, keyAuth string) error {
+	log.Debugf("Challenge Present %s", domain)
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	transaction, object, err := c.store.Begin()
+	if err != nil {
+		return err
+	}
+	account := object.(*Account)
+	if account.HTTPChallenge == nil {
+		account.HTTPChallenge = map[string]map[string][]byte{}
+	}
+	if _, ok := account.HTTPChallenge[token]; !ok {
+		account.HTTPChallenge[token] = map[string][]byte{}
+	}
+	account.HTTPChallenge[token][domain] = []byte(keyAuth)
+	return transaction.Commit(account)
+}
+
+func (c *challengeHTTPProvider) CleanUp(domain, token, keyAuth string) error {
+	log.Debugf("Challenge CleanUp %s", domain)
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	transaction, object, err := c.store.Begin()
+	if err != nil {
+		return err
+	}
+	account := object.(*Account)
+	if _, ok := account.HTTPChallenge[token]; ok {
+		if _, domainOk := account.HTTPChallenge[token][domain]; domainOk {
+			delete(account.HTTPChallenge[token], domain)
+		}
+		if len(account.HTTPChallenge[token]) == 0 {
+			delete(account.HTTPChallenge, token)
+		}
+	}
+	return transaction.Commit(account)
+}
+
+func (c *challengeHTTPProvider) Timeout() (timeout, interval time.Duration) {
+	return 60 * time.Second, 5 * time.Second
+}
--- a/acme/challenge_tls_provider.go
+++ b/acme/challenge_tls_provider.go
@ -23,14 +23,14 @@ import (
 	"github.com/xenolf/lego/acme"
 )

-var _ acme.ChallengeProviderTimeout = (*challengeProvider)(nil)
+var _ acme.ChallengeProviderTimeout = (*challengeTLSProvider)(nil)

-type challengeProvider struct {
+type challengeTLSProvider struct {
 	store cluster.Store
 	lock  sync.RWMutex
 }

-func (c *challengeProvider) getCertificate(domain string) (cert *tls.Certificate, exists bool) {
+func (c *challengeTLSProvider) getCertificate(domain string) (cert *tls.Certificate, exists bool) {
 	log.Debugf("Looking for an existing ACME challenge for %s...", domain)
 	if !strings.HasSuffix(domain, ".acme.invalid") {
 		return nil, false
@ -67,7 +67,7 @@ func (c *challengeProvider) getCertificate(domain string) (cert *tls.Certificate
 	return result, true
 }

-func (c *challengeProvider) Present(domain, token, keyAuth string) error {
+func (c *challengeTLSProvider) Present(domain, token, keyAuth string) error {
 	log.Debugf("Challenge Present %s", domain)
 	cert, _, err := tlsSNI01ChallengeCert(keyAuth)
 	if err != nil {
@ -88,7 +88,7 @@ func (c *challengeProvider) Present(domain, token, keyAuth string) error {
 	return transaction.Commit(account)
 }

-func (c *challengeProvider) CleanUp(domain, token, keyAuth string) error {
+func (c *challengeTLSProvider) CleanUp(domain, token, keyAuth string) error {
 	log.Debugf("Challenge CleanUp %s", domain)
 	c.lock.Lock()
 	defer c.lock.Unlock()
@ -101,7 +101,7 @@ func (c *challengeProvider) CleanUp(domain, token, keyAuth string) error {
 	return transaction.Commit(account)
 }

-func (c *challengeProvider) Timeout() (timeout, interval time.Duration) {
+func (c *challengeTLSProvider) Timeout() (timeout, interval time.Duration) {
 	return 60 * time.Second, 5 * time.Second
 }

--- a/acme/localStore_test.go
+++ b/acme/localStore_test.go
@ -0,0 +1,41 @@
+package acme
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestLoad(t *testing.T) {
+	acmeFile := "./acme_example.json"
+
+	folder, prefix := filepath.Split(acmeFile)
+	tmpFile, err := ioutil.TempFile(folder, prefix)
+	defer os.Remove(tmpFile.Name())
+
+	if err != nil {
+		t.Error(err)
+	}
+
+	fileContent, err := ioutil.ReadFile(acmeFile)
+	if err != nil {
+		t.Error(err)
+	}
+
+	tmpFile.Write(fileContent)
+
+	localStore := NewLocalStore(tmpFile.Name())
+	obj, err := localStore.Load()
+	if err != nil {
+		t.Error(err)
+	}
+	account, ok := obj.(*Account)
+	if !ok {
+		t.Error("Object is not an ACME Account")
+	}
+
+	if len(account.DomainsCertificate.Certs) != 1 {
+		t.Errorf("Must found %d and found %d certificates in Account", 3, len(account.DomainsCertificate.Certs))
+	}
+}
--- a/cmd/traefik/anonymize/anonymize_config_test.go
+++ b/cmd/traefik/anonymize/anonymize_config_test.go
@ -168,7 +168,7 @@ func TestDo_globalConfiguration(t *testing.T) {
 		OnHostRule:        true,
 		CAServer:          "CAServer",
 		EntryPoint:        "EntryPoint",
-		DNSProvider:       "DNSProvider",
+		DNSChallenge:      &acme.DNSChallenge{Provider: "DNSProvider"},
 		DelayDontCheckDNS: 666,
 		ACMELogging:       true,
 		TLSConfig: &tls.Config{
--- a/configuration/configuration.go
+++ b/configuration/configuration.go
@ -240,6 +240,23 @@ func (gc *GlobalConfiguration) SetEffectiveConfiguration(configFile string) {
 			log.Errorln("Error using file configuration backend, no filename defined")
 		}
 	}
+
+	if gc.ACME != nil {
+		// TODO: to remove in the futurs
+		if len(gc.ACME.StorageFile) > 0 && len(gc.ACME.Storage) == 0 {
+			log.Warn("ACME.StorageFile is deprecated, use ACME.Storage instead")
+			gc.ACME.Storage = gc.ACME.StorageFile
+		}
+
+		if len(gc.ACME.DNSProvider) > 0 {
+			log.Warn("ACME.DNSProvider is deprecated, use ACME.DNSChallenge instead")
+			gc.ACME.DNSChallenge = &acme.DNSChallenge{Provider: gc.ACME.DNSProvider, DelayBeforeCheck: gc.ACME.DelayDontCheckDNS}
+		}
+
+		if gc.ACME.OnDemand {
+			log.Warn("ACME.OnDemand is deprecated")
+		}
+	}
 }

 // DefaultEntryPoints holds default entry points
--- a/docs/configuration/acme.md
+++ b/docs/configuration/acme.md
@ -7,10 +7,14 @@ See also [Let's Encrypt examples](/user-guide/examples/#lets-encrypt-support) an
 ```toml
 # Sample entrypoint configuration when using ACME.
 [entryPoints]
+  [entryPoints.http]
+  address = ":80"
  [entryPoints.https]
  address = ":443"
    [entryPoints.https.tls]
+```

+```toml
 # Enable ACME (Let's Encrypt): automatic SSL.
 [acme]

@ -33,17 +37,16 @@ email = "test@traefik.io"
 storage = "acme.json"
 # or `storage = "traefik/acme/account"` if using KV store.

-# Entrypoint to proxy acme challenge/apply certificates to.
-# WARNING, must point to an entrypoint on port 443
+# Entrypoint to proxy acme apply certificates to.
+# WARNING, if the TLS-SNI-01 challenge is used, it must point to an entrypoint on port 443
 #
 # Required
 #
 entryPoint = "https"

-# Use a DNS based acme challenge rather than external HTTPS access
+# Use a DNS-01 acme challenge rather than TLS-SNI-01 challenge
 #
-#
-# Optional
+# Optional (Deprecated, replaced by [acme.dnsChallenge])
 #
 # dnsProvider = "digitalocean"

@ -51,25 +54,29 @@ entryPoint = "https"
 # If delayDontCheckDNS is greater than zero, avoid this & instead just wait so many seconds.
 # Useful if internal networks block external DNS queries.
 #
-# Optional
+# Optional (Deprecated, replaced by [acme.dnsChallenge])
+# Default: 0
 #
 # delayDontCheckDNS = 0

 # If true, display debug log messages from the acme client library.
 #
 # Optional
+# Default: false
 #
 # acmeLogging = true

-# Enable on demand certificate. (Deprecated)
+# Enable on demand certificate generation.
 #
-# Optional
+# Optional (Deprecated)
+# Default: false
 #
 # onDemand = true

 # Enable certificate generation on frontends Host rules.
 #
 # Optional
+# Default: false
 #
 # onHostRule = true

@ -78,26 +85,64 @@ entryPoint = "https"
 # - Leave comment to go to prod.
 #
 # Optional
+# Default: "https://acme-v01.api.letsencrypt.org/directory"
 #
 # caServer = "https://acme-staging.api.letsencrypt.org/directory"

 # Domains list.
 #
 # [[acme.domains]]
-# main = "local1.com"
-# sans = ["test1.local1.com", "test2.local1.com"]
+#   main = "local1.com"
+#   sans = ["test1.local1.com", "test2.local1.com"]
 # [[acme.domains]]
-# main = "local2.com"
-# sans = ["test1.local2.com", "test2.local2.com"]
+#   main = "local2.com"
+#   sans = ["test1.local2.com", "test2.local2.com"]
 # [[acme.domains]]
-# main = "local3.com"
+#   main = "local3.com"
 # [[acme.domains]]
-# main = "local4.com"
+#   main = "local4.com"
+
+# Use a HTTP-01 acme challenge rather than TLS-SNI-01 challenge
+#
+# Optional but recommend
+#
+[acme.httpChallenge]
+
+  # EntryPoint to use for the challenges.
+  #
+  # Required
+  #
+  entryPoint = "http"
+  
+# Use a DNS-01 acme challenge rather than TLS-SNI-01 challenge
+#
+# Optional
+#
+# [acme.dnsChallenge]
+
+  # Provider used.
+  #
+  # Required
+  #
+  # provider = "digitalocean"
+
+  # By default, the provider will verify the TXT DNS challenge record before letting ACME verify.
+  # If delayBeforeCheck is greater than zero, avoid this & instead just wait so many seconds.
+  # Useful if internal networks block external DNS queries.
+  #
+  # Optional
+  # Default: 0
+  #
+  # delayBeforeCheck = 0
 ```
+!!! note
+    Even if `TLS-SNI-01` challenge is [disabled](https://community.letsencrypt.org/t/2018-01-11-update-regarding-acme-tls-sni-and-shared-hosting-infrastructure/50188) for the moment, it stays the _by default_ ACME Challenge in Træfik.
+    If `TLS-SNI-01` challenge is not re-enabled in the future, it we will be removed from Træfik.

 !!! note
-    ACME entryPoint has to be relied to the port 443, otherwise ACME Challenges can not be done.
-    It's a Let's Encrypt limitation as described on the [community forum](https://community.letsencrypt.org/t/support-for-ports-other-than-80-and-443/3419/72).
+    If `TLS-SNI-01` challenge is used, `acme.entryPoint` has to be reachable by Let's Encrypt through the port 443.
+    If `HTTP-01` challenge is used, `acme.httpChallenge.entryPoint` has to be defined and reachable by Let's Encrypt through the port 80.
+    These are Let's Encrypt limitations as described on the [community forum](https://community.letsencrypt.org/t/support-for-ports-other-than-80-and-443/3419/72).

 ### `storage`

@ -110,7 +155,7 @@ storage = "acme.json"

 File or key used for certificates storage.

-**WARNING** If you use Træfik in Docker, you have 2 options:
+**WARNING:** If you use Træfik in Docker, you have 2 options:

 - create a file on your host and mount it as a volume:
 ```toml
@ -133,19 +178,60 @@ docker run -v "/my/host/acme:/etc/traefik/acme" traefik

 !!! note
    During Træfik configuration migration from a configuration file to a KV store (thanks to `storeconfig` subcommand as described [here](/user-guide/kv-config/#store-configuration-in-key-value-store)), if ACME certificates have to be migrated too, use both `storageFile` and `storage`.
-    `storageFile` will contain the path to the `acme.json` file to migrate.
-    `storage` will contain the key where the certificates will be stored.

-### `dnsProvider`
+    - `storageFile` will contain the path to the `acme.json` file to migrate.
+    - `storage` will contain the key where the certificates will be stored.
+
+### `acme.httpChallenge`
+
+Use `HTTP-01` challenge to generate/renew ACME certificates.

 ```toml
 [acme]
 # ...
-dnsProvider = "digitalocean"
+entryPoint = "https"
+[acme.httpChallenge]
+  entryPoint = "http"
+```
+
+#### `entryPoint`
+
+Specify the entryPoint to use during the challenges.
+
+```toml
+[entryPoints]
+  [entryPoints.http]
+  address = ":80"
+  [entryPoints.https]
+  address = ":443"
+    [entryPoints.https.tls]
+# ...
+
+[acme]
+  # ...
+  entryPoint = "https"
+  [acme.httpChallenge]
+    entryPoint = "http"
+```
+
+!!! note
+    `acme.httpChallenge.entryPoint` has to be reachable by Let's Encrypt through the port 80.
+    It's a Let's Encrypt limitation as described on the [community forum](https://community.letsencrypt.org/t/support-for-ports-other-than-80-and-443/3419/72).
+
+### `acme.dnsChallenge`
+
+Use `DNS-01` challenge to generate/renew ACME certificates.
+
+```toml
+[acme]
+# ...
+[acme.dnsChallenge]
+  provider = "digitalocean"
+  delayBeforeCheck = 0
 # ...
 ```

-Use a DNS based acme challenge rather than external HTTPS access, e.g. for a firewalled server.
+#### `provider` 

 Select the provider that matches the DNS domain that will host the challenge TXT record, and provide environment variables to enable setting it:

@ -164,7 +250,7 @@ Select the provider that matches the DNS domain that will host the challenge TXT
 | [GoDaddy](https://godaddy.com/domains)                 | `godaddy`      | `GODADDY_API_KEY`, `GODADDY_API_SECRET`                                                                                   |
 | [Google Cloud DNS](https://cloud.google.com/dns/docs/) | `gcloud`       | `GCE_PROJECT`, `GCE_SERVICE_ACCOUNT_FILE`                                                                                 |
 | [Linode](https://www.linode.com)                       | `linode`       | `LINODE_API_KEY`                                                                                                          |
-| manual                                                 | -              | none, but run Træfik interactively & turn on `acmeLogging` to see instructions & press <kbd>Enter</kbd>.                 |
+| manual                                                 | -              | none, but run Træfik interactively & turn on `acmeLogging` to see instructions & press <kbd>Enter</kbd>.                  |
 | [Namecheap](https://www.namecheap.com)                 | `namecheap`    | `NAMECHEAP_API_USER`, `NAMECHEAP_API_KEY`                                                                                 |
 | [Ns1](https://ns1.com/)                                | `ns1`          | `NS1_API_KEY`                                                                                                             |
 | [Open Telekom Cloud](https://cloud.telekom.de/en/)     | `otc`          | `OTC_DOMAIN_NAME`, `OTC_USER_NAME`, `OTC_PASSWORD`, `OTC_PROJECT_NAME`, `OTC_IDENTITY_ENDPOINT`                           |
@ -175,22 +261,21 @@ Select the provider that matches the DNS domain that will host the challenge TXT
 | [Route 53](https://aws.amazon.com/route53/)            | `route53`      | `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`, `AWS_REGION`, `AWS_HOSTED_ZONE_ID` or configured user/instance IAM profile. |
 | [VULTR](https://www.vultr.com)                         | `vultr`        | `VULTR_API_KEY`                                                                                                           |

-### `delayDontCheckDNS`
+#### `delayBeforeCheck`

-```toml
-[acme]
-# ...
-delayDontCheckDNS = 0
-# ...
-```
-
-By default, the dnsProvider will verify the TXT DNS challenge record before letting ACME verify.  
-If `delayDontCheckDNS` is greater than zero, avoid this & instead just wait so many seconds.
+By default, the `provider` will verify the TXT DNS challenge record before letting ACME verify.  
+If `delayBeforeCheck` is greater than zero, avoid this & instead just wait so many seconds.

 Useful if internal networks block external DNS queries.

+!!! note
+    This field has no sense if a `provider` is not defined.
+
 ### `onDemand` (Deprecated)

+!!! warning
+    This option is deprecated.
+
 ```toml
 [acme]
 # ...
@ -208,9 +293,6 @@ This will request a certificate from Let's Encrypt during the first TLS handshak
 !!! warning
    Take note that Let's Encrypt have [rate limiting](https://letsencrypt.org/docs/rate-limits).

-!!! warning
-    This option is deprecated.
-
 ### `onHostRule`

 ```toml
@ -240,21 +322,21 @@ CA server to use.
 - Uncomment the line to run on the staging Let's Encrypt server.
 - Leave comment to go to prod.

-### `domains`
+### `acme.domains`

 ```toml
 [acme]
 # ...
 [[acme.domains]]
-main = "local1.com"
-sans = ["test1.local1.com", "test2.local1.com"]
+  main = "local1.com"
+  sans = ["test1.local1.com", "test2.local1.com"]
 [[acme.domains]]
-main = "local2.com"
-sans = ["test1.local2.com", "test2.local2.com"]
+  main = "local2.com"
+  sans = ["test1.local2.com", "test2.local2.com"]
 [[acme.domains]]
-main = "local3.com"
+  main = "local3.com"
 [[acme.domains]]
-main = "local4.com"
+  main = "local4.com"
 # ...
 ```

@ -265,3 +347,15 @@ All domains must have A/AAAA records pointing to Træfik.
    Take note that Let's Encrypt have [rate limiting](https://letsencrypt.org/docs/rate-limits).

 Each domain & SANs will lead to a certificate request.
+
+### `dnsProvider` (Deprecated)
+
+!!! warning
+    This option is deprecated.
+    Please refer to [DNS challenge provider section](/configuration/acme/#provider)
+
+### `delayDontCheckDNS` (Deprecated)
+
+!!! warning
+    This option is deprecated.
+    Please refer to [DNS challenge delayBeforeCheck section](/configuration/acme/#delaybeforecheck)
--- a/docs/user-guide/cluster-docker-consul.md
+++ b/docs/user-guide/cluster-docker-consul.md
@ -56,15 +56,18 @@ $ traefik \
    --acme \
    --acme.storage=/etc/traefik/acme/acme.json \
    --acme.entryPoint=https \
+    --acme.httpChallenge.entryPoint=http \
    --acme.email=contact@mydomain.ca
 ```

-Let's Encrypt needs 3 parameters: an entry point to listen to, a storage for certificates, and an email for the registration.
+Let's Encrypt needs 4 parameters: an TLS entry point to listen to, a non-TLS entry point to allow HTTP challenges, a storage for certificates, and an email for the registration.

 To enable Let's Encrypt support, you need to add `--acme` flag.

 Now, Træfik needs to know where to store the certificates, we can choose between a key in a Key-Value store, or a file path: `--acme.storage=my/key` or `--acme.storage=/path/to/acme.json`.

+The `acme.httpChallenge.entryPoint` flag enables the `HTTP-01` challenge and specifies the entryPoint to use during the challenges.
+
 For your email and the entry point, it's `--acme.entryPoint` and `--acme.email` flags.

 ### Docker configuration
@ -97,6 +100,7 @@ services:
      - "--acme"
      - "--acme.storage=/etc/traefik/acme/acme.json"
      - "--acme.entryPoint=https"
+      - "--acme.httpChallenge.entryPoint=http"
      - "--acme.OnHostRule=true"
      - "--acme.onDemand=false"
      - "--acme.email=contact@mydomain.ca"
@ -206,12 +210,13 @@ services:
      - "--acme"
      - "--acme.storage=traefik/acme/account"
      - "--acme.entryPoint=https"
+      - "--acme.httpChallenge.entryPoint=http"
      - "--acme.OnHostRule=true"
      - "--acme.onDemand=false"
-      - "--acme.email=contact@jmaitrehenry.ca"
+      - "--acme.email=foobar@example.com"
      - "--docker"
      - "--docker.swarmmode"
-      - "--docker.domain=jmaitrehenry.ca"
+      - "--docker.domain=example.com"
      - "--docker.watch"
      - "--consul"
      - "--consul.endpoint=consul:8500"
--- a/docs/user-guide/docker-and-lets-encrypt.md
+++ b/docs/user-guide/docker-and-lets-encrypt.md
@ -104,6 +104,8 @@ email = "your-email-here@my-awesome-app.org"
 storage = "acme.json"
 entryPoint = "https"
 OnHostRule = true
+[acme.httpChallenge]
+entryPoint = "http"
 ```

 This is the minimum configuration required to do the following:
--- a/docs/user-guide/examples.md
+++ b/docs/user-guide/examples.md
@ -6,6 +6,7 @@ You will find here some configuration examples of Træfik.

 ```toml
 defaultEntryPoints = ["http"]
+
 [entryPoints]
  [entryPoints.http]
  address = ":80"
@ -15,6 +16,7 @@ defaultEntryPoints = ["http"]

 ```toml
 defaultEntryPoints = ["http", "https"]
+
 [entryPoints]
  [entryPoints.http]
  address = ":80"
@ -34,6 +36,7 @@ Note that we can either give path to certificate file or directly the file conte

 ```toml
 defaultEntryPoints = ["http", "https"]
+
 [entryPoints]
  [entryPoints.http]
  address = ":80"
@ -52,10 +55,16 @@ defaultEntryPoints = ["http", "https"]

 ## Let's Encrypt support

-### Basic example
+!!! note
+    Even if `TLS-SNI-01` challenge is [disabled](https://community.letsencrypt.org/t/2018-01-11-update-regarding-acme-tls-sni-and-shared-hosting-infrastructure/50188), for the moment, it stays the _by default_ ACME Challenge in Træfik but all the examples use the `HTTP-01` challenge (except DNS challenge examples).
+    If `TLS-SNI-01` challenge is not re-enabled in the future, it we will be removed from Træfik.
+
+### Basic example with HTTP challenge

 ```toml
 [entryPoints]
+  [entryPoints.http]
+  address = ":80"
  [entryPoints.https]
  address = ":443"
    [entryPoints.https.tls]
@ -65,6 +74,8 @@ email = "test@traefik.io"
 storage = "acme.json"
 caServer = "http://172.18.0.1:4000/directory"
 entryPoint = "https"
+  [acme.httpChallenge]
+  entryPoint = "http"

 [[acme.domains]]
  main = "local1.com"
@ -78,14 +89,16 @@ entryPoint = "https"
  main = "local4.com"
 ```

-This configuration allows generating Let's Encrypt certificates for the four domains `local[1-4].com` with described SANs.
+This configuration allows generating Let's Encrypt certificates (thanks to `HTTP-01` challenge) for the four domains `local[1-4].com` with described SANs.

 Traefik generates these certificates when it starts and it needs to be restart if new domains are added.

-### OnHostRule option
+### OnHostRule option (with HTTP challenge)

 ```toml
 [entryPoints]
+  [entryPoints.http]
+  address = ":80"
  [entryPoints.https]
  address = ":443"
    [entryPoints.https.tls]
@ -96,6 +109,8 @@ storage = "acme.json"
 onHostRule = true
 caServer = "http://172.18.0.1:4000/directory"
 entryPoint = "https"
+  [acme.httpChallenge]
+  entryPoint = "http"

 [[acme.domains]]
  main = "local1.com"
@ -109,16 +124,18 @@ entryPoint = "https"
  main = "local4.com"
 ```

-This configuration allows generating Let's Encrypt certificates for the four domains `local[1-4].com`.
+This configuration allows generating Let's Encrypt certificates (thanks to `HTTP-01` challenge) for the four domains `local[1-4].com`.

 Traefik generates these certificates when it starts.

 If a backend is added with a `onHost` rule, Traefik will automatically generate the Let's Encrypt certificate for the new domain.

-### OnDemand option
+### OnDemand option (with HTTP challenge)

 ```toml
 [entryPoints]
+  [entryPoints.http]
+  address = ":80"
  [entryPoints.https]
  address = ":443"
    [entryPoints.https.tls]
@ -129,9 +146,11 @@ storage = "acme.json"
 onDemand = true
 caServer = "http://172.18.0.1:4000/directory"
 entryPoint = "https"
+  [acme.httpChallenge]
+  entryPoint = "http"
 ```

-This configuration allows generating a Let's Encrypt certificate during the first HTTPS request on a new domain.
+This configuration allows generating a Let's Encrypt certificate (thanks to `HTTP-01` challenge) during the first HTTPS request on a new domain.


 !!! note
@ -153,10 +172,11 @@ This configuration allows generating a Let's Encrypt certificate during the firs
 [acme]
 email = "test@traefik.io"
 storage = "acme.json"
-dnsProvider = "digitalocean" # DNS Provider name (cloudflare, OVH, gandi...)
-delayDontCheckDNS = 0
 caServer = "http://172.18.0.1:4000/directory"
 entryPoint = "https"
+  [acme.dnsChallenge]
+  provider = "digitalocean" # DNS Provider name (cloudflare, OVH, gandi...)
+  delayBeforeCheck = 0

 [[acme.domains]]
  main = "local1.com"
@ -173,12 +193,14 @@ entryPoint = "https"
 DNS challenge needs environment variables to be executed.
 This variables have to be set on the machine/container which host Traefik.

-These variables are described [in this section](/configuration/acme/#dnsprovider).
+These variables are described [in this section](/configuration/acme/#provider).

-### OnHostRule option and provided certificates
+### OnHostRule option and provided certificates (with HTTP challenge)

 ```toml
 [entryPoints]
+  [entryPoints.http]
+  address = ":80"
  [entryPoints.https]
  address = ":443"
    [entryPoints.https.tls]
@ -192,10 +214,11 @@ storage = "acme.json"
 onHostRule = true
 caServer = "http://172.18.0.1:4000/directory"
 entryPoint = "https"
-
+  [acme.httpChallenge]
+  entryPoint = "http"
 ```

-Traefik will only try to generate a Let's encrypt certificate if the domain cannot be checked by the provided certificates.
+Traefik will only try to generate a Let's encrypt certificate (thanks to `HTTP-01` challenge) if the domain cannot be checked by the provided certificates.

 ### Cluster mode

@ -207,6 +230,8 @@ Before you use Let's Encrypt in a Traefik cluster, take a look to [the key-value

 ```toml
 [entryPoints]
+  [entryPoints.http]
+  address = ":80"
  [entryPoints.https]
  address = ":443"
    [entryPoints.https.tls]
@ -217,6 +242,9 @@ storage = "traefik/acme/account"
 caServer = "http://172.18.0.1:4000/directory"
 entryPoint = "https"

+[acme.httpChallenge]
+    entryPoint = "http"
+
 [[acme.domains]]
  main = "local1.com"
  sans = ["test1.local1.com", "test2.local1.com"]
@ -244,10 +272,12 @@ The `consul` provider contains the configuration.

 ```toml
 [frontends]
+
  [frontends.frontend1]
  backend = "backend2"
    [frontends.frontend1.routes.test_1]
    rule = "Host:test.localhost"
+
  [frontends.frontend2]
  backend = "backend1"
  passHostHeader = true
@ -255,10 +285,11 @@ The `consul` provider contains the configuration.
  entrypoints = ["https"] # overrides defaultEntryPoints
    [frontends.frontend2.routes.test_1]
    rule = "Host:{subdomain:[a-z]+}.localhost"
+
  [frontends.frontend3]
  entrypoints = ["http", "https"] # overrides defaultEntryPoints
  backend = "backend2"
-    rule = "Path:/test"
+  rule = "Path:/test"
 ```

 ## Enable Basic authentication in an entrypoint
@ -272,6 +303,7 @@ Passwords are encoded in MD5: you can use htpasswd to generate those ones.

 ```toml
 defaultEntryPoints = ["http"]
+
 [entryPoints]
  [entryPoints.http]
  address = ":80"
@ -286,6 +318,7 @@ via a configurable header value.

 ```toml
 defaultEntryPoints = ["http"]
+
 [entryPoints]
  [entryPoints.http]
  address = ":80"
--- a/examples/acme/acme.toml
+++ b/examples/acme/acme.toml
@ -19,6 +19,8 @@ entryPoint = "https"
 onDemand = false
 OnHostRule = true
 caServer = "http://traefik.localhost.com:4000/directory"
+[acme.httpChallenge]
+entryPoint="http"


 [web]
--- a/examples/acme/compose-acme.yml
+++ b/examples/acme/compose-acme.yml
@ -78,6 +78,7 @@ services :
        - "80:80"
        - "443:443"
        - "5001:443" # Needed for SNI challenge
+        - "5002:80" # Needed for HTTP challenge
      expose:
        - "8080"
      labels:
--- a/examples/cluster/docker-compose.yml
+++ b/examples/cluster/docker-compose.yml
@ -136,11 +136,13 @@ services:
      expose:
        - "443"
        - "5001"
+        - "5002"
      ports:
        - "80:80"
        - "8080:8080"
        - "443:443"
        - "5001:443" # Needed for SNI challenge
+        - "5002:80" # Needed for HTTP challenge
      networks:
        net:
          ipv4_address: 10.0.1.8
@ -157,6 +159,7 @@ services:
      expose:
        - "443"
        - "5001"
+        - "5002"
      ports:
        - "88:80"
        - "8888:8080"
--- a/examples/cluster/traefik.toml.tmpl
+++ b/examples/cluster/traefik.toml.tmpl
@ -15,6 +15,8 @@ storage = "traefik/acme/account"
 entryPoint = "https"
 OnHostRule = true
 caServer = "http://traefik.boulder.com:4000/directory"
+[acme.httpChallenge]
+entryPoint="http"


 [web]
--- a/integration/acme_test.go
+++ b/integration/acme_test.go
@ -72,6 +72,26 @@ func (s *AcmeSuite) TestOnHostRuleRetrieveAcmeCertificate(c *check.C) {
 	s.retrieveAcmeCertificate(c, testCase)
 }

+// Test OnDemand option with none provided certificate and challenge HTTP-01
+func (s *AcmeSuite) TestOnDemandRetrieveAcmeCertificateHTTP01(c *check.C) {
+	testCase := AcmeTestCase{
+		traefikConfFilePath: "fixtures/acme/acme_http01.toml",
+		onDemand:            true,
+		domainToCheck:       acmeDomain}
+
+	s.retrieveAcmeCertificate(c, testCase)
+}
+
+// Test OnHostRule option with none provided certificate and challenge HTTP-01
+func (s *AcmeSuite) TestOnHostRuleRetrieveAcmeCertificateHTTP01(c *check.C) {
+	testCase := AcmeTestCase{
+		traefikConfFilePath: "fixtures/acme/acme_http01.toml",
+		onDemand:            false,
+		domainToCheck:       acmeDomain}
+
+	s.retrieveAcmeCertificate(c, testCase)
+}
+
 // Test OnDemand option with a wildcard provided certificate
 func (s *AcmeSuite) TestOnDemandRetrieveAcmeCertificateWithWildcard(c *check.C) {
 	testCase := AcmeTestCase{
--- a/integration/fixtures/acme/acme_http01.toml
+++ b/integration/fixtures/acme/acme_http01.toml
@ -0,0 +1,35 @@
+logLevel = "DEBUG"
+
+defaultEntryPoints = ["http", "https"]
+
+[entryPoints]
+  [entryPoints.http]
+  address = ":5002"
+  [entryPoints.https]
+  address = ":5001"
+    [entryPoints.https.tls]
+
+
+[acme]
+email = "test@traefik.io"
+storage = "/dev/null"
+entryPoint = "https"
+onDemand = {{.OnDemand}}
+OnHostRule = {{.OnHostRule}}
+caServer = "http://{{.BoulderHost}}:4000/directory"
+[acme.httpchallenge]
+entrypoint="http"
+
+[file]
+
+[backends]
+  [backends.backend]
+    [backends.backend.servers.server1]
+    url = "http://127.0.0.1:9010"
+
+
+[frontends]
+  [frontends.frontend]
+  backend = "backend"
+    [frontends.frontend.routes.test]
+    rule = "Host:traefik.acme.wtf"
--- a/provider/kubernetes/kubernetes.go
+++ b/provider/kubernetes/kubernetes.go
@ -80,11 +80,11 @@ func (p *Provider) newK8sClient() (Client, error) {
 	}

 	if os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "" {
-		log.Infof("Creating in-cluster Provider client%s\n", withEndpoint)
+		log.Infof("Creating in-cluster Provider client%s", withEndpoint)
 		return NewInClusterClient(p.Endpoint)
 	}

-	log.Infof("Creating cluster-external Provider client%s\n", withEndpoint)
+	log.Infof("Creating cluster-external Provider client%s", withEndpoint)
 	return NewExternalClusterClient(p.Endpoint, p.Token, p.CertAuthFilePath)
 }

--- a/server/server.go
+++ b/server/server.go
@ -758,6 +758,10 @@ func (s *Server) addInternalPublicRoutes(entryPointName string, router *mux.Rout
 	if s.globalConfiguration.Ping != nil && s.globalConfiguration.Ping.EntryPoint != "" && s.globalConfiguration.Ping.EntryPoint == entryPointName {
 		s.globalConfiguration.Ping.AddRoutes(router)
 	}
+
+	if s.globalConfiguration.ACME != nil && s.globalConfiguration.ACME.HTTPChallenge != nil && s.globalConfiguration.ACME.HTTPChallenge.EntryPoint == entryPointName {
+		s.globalConfiguration.ACME.AddRoutes(router)
+	}
 }

 func (s *Server) prepareServer(entryPointName string, entryPoint *configuration.EntryPoint, router *middlewares.HandlerSwitcher, middlewares []negroni.Handler, internalMiddlewares []negroni.Handler) (*http.Server, net.Listener, error) {