acme: add external account binding support.

docs/content/https/acme.md

@@ -408,6 +408,35 @@ certificatesResolvers:
 [ACME V2](https://community.letsencrypt.org/t/acme-v2-and-wildcard-certificate-support-is-live/55579) supports wildcard certificates.
 As described in [Let's Encrypt's post](https://community.letsencrypt.org/t/staging-endpoint-for-acme-v2/49605) wildcard certificates can only be generated through a [`DNS-01` challenge](#dnschallenge).
 
+## External Account Binding
+
+- `kid`: Key identifier from External CA
+- `hmacEncoded`: HMAC key from External CA, should be in Base64 URL Encoding without padding format
+
+```toml tab="File (TOML)"
+[certificatesResolvers.myresolver.acme]
+  # ...
+  [certificatesResolvers.myresolver.acme.eab]
+    kid = "abc-keyID-xyz"
+    hmacEncoded = "abc-hmac-xyz"
+```
+
+```yaml tab="File (YAML)"
+certificatesResolvers:
+  myresolver:
+    acme:
+      # ...
+      eab:
+        kid: abc-keyID-xyz
+        hmacEncoded: abc-hmac-xyz
+```
+
+```bash tab="CLI"
+# ...
+--certificatesresolvers.myresolver.acme.eab.kid=abc-keyID-xyz
+--certificatesresolvers.myresolver.acme.eab.hmacencoded=abc-hmac-xyz
+```
+
 ## More Configuration
 
 ### `caServer`

docs/content/reference/static-configuration/cli-ref.md

@@ -69,6 +69,12 @@ Use a DNS-01 based challenge provider rather than HTTPS.
 `--certificatesresolvers.<name>.acme.dnschallenge.resolvers`:  
 Use following DNS servers to resolve the FQDN authority.
 
+`--certificatesresolvers.<name>.acme.eab.hmacencoded`:  
+Base64 encoded HMAC key from External CA.
+
+`--certificatesresolvers.<name>.acme.eab.kid`:  
+Key identifier from External CA.
+
 `--certificatesresolvers.<name>.acme.email`:  
 Email address used for registration.
 

docs/content/reference/static-configuration/env-ref.md

@@ -69,6 +69,12 @@ Use a DNS-01 based challenge provider rather than HTTPS.
 `TRAEFIK_CERTIFICATESRESOLVERS_<NAME>_ACME_DNSCHALLENGE_RESOLVERS`:  
 Use following DNS servers to resolve the FQDN authority.
 
+`TRAEFIK_CERTIFICATESRESOLVERS_<NAME>_ACME_EAB_HMACENCODED`:  
+Base64 encoded HMAC key from External CA.
+
+`TRAEFIK_CERTIFICATESRESOLVERS_<NAME>_ACME_EAB_KID`:  
+Key identifier from External CA.
+
 `TRAEFIK_CERTIFICATESRESOLVERS_<NAME>_ACME_EMAIL`:  
 Email address used for registration.
 

docs/content/reference/static-configuration/file.toml

@@ -103,7 +103,7 @@
     namespaces = ["foobar", "foobar"]
     labelSelector = "foobar"
     ingressClass = "foobar"
-    throttleDuration = "10s"
+    throttleDuration = "42s"
     [providers.kubernetesIngress.ingressEndpoint]
       ip = "foobar"
       hostname = "foobar"
@@ -251,9 +251,6 @@
     addEntryPointsLabels = true
     addServicesLabels = true
 
-[pilot]
-  token = "foobar"
-
 [ping]
   entryPoint = "foobar"
   manualRouting = true
@@ -343,6 +340,9 @@
       preferredChain = "foobar"
       storage = "foobar"
       keyType = "foobar"
+      [certificatesResolvers.CertificateResolver0.acme.eab]
+        kid = "foobar"
+        hmacEncoded = "foobar"
       [certificatesResolvers.CertificateResolver0.acme.dnsChallenge]
         provider = "foobar"
         delayBeforeCheck = 42
@@ -358,6 +358,9 @@
       preferredChain = "foobar"
       storage = "foobar"
       keyType = "foobar"
+      [certificatesResolvers.CertificateResolver1.acme.eab]
+        kid = "foobar"
+        hmacEncoded = "foobar"
       [certificatesResolvers.CertificateResolver1.acme.dnsChallenge]
         provider = "foobar"
         delayBeforeCheck = 42
@@ -367,6 +370,9 @@
         entryPoint = "foobar"
       [certificatesResolvers.CertificateResolver1.acme.tlsChallenge]
 
+[pilot]
+  token = "foobar"
+
 [experimental]
   [experimental.plugins]
     [experimental.plugins.Descriptor0]

docs/content/reference/static-configuration/file.yaml

@@ -270,8 +270,6 @@ metrics:
     password: foobar
     addEntryPointsLabels: true
     addServicesLabels: true
-pilot:
-  token: foobar
 ping:
   entryPoint: foobar
   manualRouting: true
@@ -358,6 +356,9 @@ certificatesResolvers:
       preferredChain: foobar
       storage: foobar
       keyType: foobar
+      eab:
+        kid: foobar
+        hmacEncoded: foobar
       dnsChallenge:
         provider: foobar
         delayBeforeCheck: 42
@@ -375,6 +376,9 @@ certificatesResolvers:
       preferredChain: foobar
       storage: foobar
       keyType: foobar
+      eab:
+        kid: foobar
+        hmacEncoded: foobar
       dnsChallenge:
         provider: foobar
         delayBeforeCheck: 42
@@ -385,6 +389,8 @@ certificatesResolvers:
       httpChallenge:
         entryPoint: foobar
       tlsChallenge: {}
+pilot:
+  token: foobar
 experimental:
   plugins:
     Descriptor0:

pkg/provider/acme/provider.go

@@ -38,6 +38,8 @@ type Configuration struct {
 	PreferredChain string `description:"Preferred chain to use." json:"preferredChain,omitempty" toml:"preferredChain,omitempty" yaml:"preferredChain,omitempty" export:"true"`
 	Storage        string `description:"Storage to use." json:"storage,omitempty" toml:"storage,omitempty" yaml:"storage,omitempty" export:"true"`
 	KeyType        string `description:"KeyType used for generating certificate private key. Allow value 'EC256', 'EC384', 'RSA2048', 'RSA4096', 'RSA8192'." json:"keyType,omitempty" toml:"keyType,omitempty" yaml:"keyType,omitempty" export:"true"`
+	EAB            *EAB   `description:"External Account Binding to use." json:"eab,omitempty" toml:"eab,omitempty" yaml:"eab,omitempty"`
+
 	DNSChallenge  *DNSChallenge  `description:"Activate DNS-01 Challenge." json:"dnsChallenge,omitempty" toml:"dnsChallenge,omitempty" yaml:"dnsChallenge,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 	HTTPChallenge *HTTPChallenge `description:"Activate HTTP-01 Challenge." json:"httpChallenge,omitempty" toml:"httpChallenge,omitempty" yaml:"httpChallenge,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 	TLSChallenge  *TLSChallenge  `description:"Activate TLS-ALPN-01 Challenge." json:"tlsChallenge,omitempty" toml:"tlsChallenge,omitempty" yaml:"tlsChallenge,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
@@ -63,7 +65,13 @@ type Certificate struct {
 	Key         []byte       `json:"key,omitempty" toml:"key,omitempty" yaml:"key,omitempty"`
 }
 
-// DNSChallenge contains DNS challenge Configuration.
+// EAB contains External Account Binding configuration.
+type EAB struct {
+	Kid         string `description:"Key identifier from External CA." json:"kid,omitempty" toml:"kid,omitempty" yaml:"kid,omitempty"`
+	HmacEncoded string `description:"Base64 encoded HMAC key from External CA." json:"hmacEncoded,omitempty" toml:"hmacEncoded,omitempty" yaml:"hmacEncoded,omitempty"`
+}
+
+// DNSChallenge contains DNS challenge configuration.
 type DNSChallenge struct {
 	Provider                string          `description:"Use a DNS-01 based challenge provider rather than HTTPS." json:"provider,omitempty" toml:"provider,omitempty" yaml:"provider,omitempty" export:"true"`
 	DelayBeforeCheck        ptypes.Duration `description:"Assume DNS propagates after a delay in seconds rather than finding and querying nameservers." json:"delayBeforeCheck,omitempty" toml:"delayBeforeCheck,omitempty" yaml:"delayBeforeCheck,omitempty" export:"true"`
@@ -71,12 +79,12 @@ type DNSChallenge struct {
 	DisablePropagationCheck bool            `description:"Disable the DNS propagation checks before notifying ACME that the DNS challenge is ready. [not recommended]" json:"disablePropagationCheck,omitempty" toml:"disablePropagationCheck,omitempty" yaml:"disablePropagationCheck,omitempty" export:"true"`
 }
 
-// HTTPChallenge contains HTTP challenge Configuration.
+// HTTPChallenge contains HTTP challenge configuration.
 type HTTPChallenge struct {
 	EntryPoint string `description:"HTTP challenge EntryPoint" json:"entryPoint,omitempty" toml:"entryPoint,omitempty" yaml:"entryPoint,omitempty"  export:"true"`
 }
 
-// TLSChallenge contains TLS challenge Configuration.
+// TLSChallenge contains TLS challenge configuration.
 type TLSChallenge struct{}
 
 // Provider holds configurations of the provider.
@@ -233,9 +241,7 @@ func (p *Provider) getClient() (*lego.Client, error) {
 
 	// New users will need to register; be sure to save it
 	if account.GetRegistration() == nil {
-		logger.Info("Register...")
+		reg, errR := p.register(ctx, client)
-
-		reg, errR := client.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: true})
 		if errR != nil {
 			return nil, errR
 		}
@@ -324,6 +330,22 @@ func (p *Provider) initAccount(ctx context.Context) (*Account, error) {
 	return p.account, nil
 }
 
+func (p *Provider) register(ctx context.Context, client *lego.Client) (*registration.Resource, error) {
+	logger := log.FromContext(ctx)
+
+	if p.EAB != nil {
+		logger.Info("Register with external account binding...")
+
+		eabOptions := registration.RegisterEABOptions{TermsOfServiceAgreed: true, Kid: p.EAB.Kid, HmacEncoded: p.EAB.HmacEncoded}
+
+		return client.Registration.RegisterWithExternalAccountBinding(eabOptions)
+	}
+
+	logger.Info("Register...")
+
+	return client.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: true})
+}
+
 func (p *Provider) resolveDomains(ctx context.Context, domains []string, tlsStore string) {
 	if len(domains) == 0 {
 		log.FromContext(ctx).Debug("No domain parsed in provider ACME")