Upgrade server dependencies, manage them with govendor

vendor/github.com/xenolf/lego/acme/challenges.go

@@ -0,0 +1,16 @@
+package acme
+
+// Challenge is a string that identifies a particular type and version of ACME challenge.
+type Challenge string
+
+const (
+	// HTTP01 is the "http-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#http
+	// Note: HTTP01ChallengePath returns the URL path to fulfill this challenge
+	HTTP01 = Challenge("http-01")
+	// TLSSNI01 is the "tls-sni-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#tls-with-server-name-indication-tls-sni
+	// Note: TLSSNI01ChallengeCert returns a certificate to fulfill this challenge
+	TLSSNI01 = Challenge("tls-sni-01")
+	// DNS01 is the "dns-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#dns
+	// Note: DNS01Record returns a DNS record which will fulfill this challenge
+	DNS01 = Challenge("dns-01")
+)

vendor/github.com/xenolf/lego/acme/client.go

@@ -1,8 +1,8 @@
+// Package acme implements the ACME protocol for Let's Encrypt and other conforming providers.
 package acme
 
 import (
 	"crypto"
-	"crypto/rsa"
 	"crypto/x509"
 	"encoding/base64"
 	"encoding/json"
@@ -11,6 +11,7 @@ import (
 	"io/ioutil"
 	"log"
 	"net"
+	"net/http"
 	"regexp"
 	"strconv"
 	"strings"
@@ -22,6 +23,16 @@ var (
 	Logger *log.Logger
 )
 
+const (
+	// maxBodySize is the maximum size of body that we will read.
+	maxBodySize = 1024 * 1024
+
+	// overallRequestLimit is the overall number of request per second limited on the
+	// “new-reg”, “new-authz” and “new-cert” endpoints. From the documentation the
+	// limitation is 20 requests per second, but using 20 as value doesn't work but 18 do
+	overallRequestLimit = 18
+)
+
 // logf writes a log entry. It uses Logger if not
 // nil, otherwise it uses the default log.Logger.
 func logf(format string, args ...interface{}) {
@@ -37,7 +48,7 @@ func logf(format string, args ...interface{}) {
 type User interface {
 	GetEmail() string
 	GetRegistration() *RegistrationResource
-	GetPrivateKey() *rsa.PrivateKey
+	GetPrivateKey() crypto.PrivateKey
 }
 
 // Interface for all challenge solvers to implement.
@@ -49,27 +60,23 @@ type validateFunc func(j *jws, domain, uri string, chlng challenge) error
 
 // Client is the user-friendy way to ACME
 type Client struct {
-	directory  directory
-	user       User
-	jws        *jws
-	keyBits    int
-	issuerCert []byte
-	solvers    map[string]solver
+	directory directory
+	user      User
+	jws       *jws
+	keyType   KeyType
+	solvers   map[Challenge]solver
 }
 
 // NewClient creates a new ACME client on behalf of the user. The client will depend on
-// the ACME directory located at caDirURL for the rest of its actions. It will
-// generate private keys for certificates of size keyBits.
-func NewClient(caDirURL string, user User, keyBits int) (*Client, error) {
+// the ACME directory located at caDirURL for the rest of its actions.  A private
+// key of type keyType (see KeyType contants) will be generated when requesting a new
+// certificate if one isn't provided.
+func NewClient(caDirURL string, user User, keyType KeyType) (*Client, error) {
 	privKey := user.GetPrivateKey()
 	if privKey == nil {
 		return nil, errors.New("private key was nil")
 	}
 
-	if err := privKey.Validate(); err != nil {
-		return nil, fmt.Errorf("invalid private key: %v", err)
-	}
-
 	var dir directory
 	if _, err := getJSON(caDirURL, &dir); err != nil {
 		return nil, fmt.Errorf("get directory at '%s': %v", caDirURL, err)
@@ -93,25 +100,42 @@ func NewClient(caDirURL string, user User, keyBits int) (*Client, error) {
 	// REVIEW: best possibility?
 	// Add all available solvers with the right index as per ACME
 	// spec to this map. Otherwise they won`t be found.
-	solvers := make(map[string]solver)
-	solvers["http-01"] = &httpChallenge{jws: jws, validate: validate}
-	solvers["tls-sni-01"] = &tlsSNIChallenge{jws: jws, validate: validate}
+	solvers := make(map[Challenge]solver)
+	solvers[HTTP01] = &httpChallenge{jws: jws, validate: validate, provider: &HTTPProviderServer{}}
+	solvers[TLSSNI01] = &tlsSNIChallenge{jws: jws, validate: validate, provider: &TLSProviderServer{}}
 
-	return &Client{directory: dir, user: user, jws: jws, keyBits: keyBits, solvers: solvers}, nil
+	return &Client{directory: dir, user: user, jws: jws, keyType: keyType, solvers: solvers}, nil
+}
+
+// SetChallengeProvider specifies a custom provider p that can solve the given challenge type.
+func (c *Client) SetChallengeProvider(challenge Challenge, p ChallengeProvider) error {
+	switch challenge {
+	case HTTP01:
+		c.solvers[challenge] = &httpChallenge{jws: c.jws, validate: validate, provider: p}
+	case TLSSNI01:
+		c.solvers[challenge] = &tlsSNIChallenge{jws: c.jws, validate: validate, provider: p}
+	case DNS01:
+		c.solvers[challenge] = &dnsChallenge{jws: c.jws, validate: validate, provider: p}
+	default:
+		return fmt.Errorf("Unknown challenge %v", challenge)
+	}
+	return nil
 }
 
 // SetHTTPAddress specifies a custom interface:port to be used for HTTP based challenges.
 // If this option is not used, the default port 80 and all interfaces will be used.
 // To only specify a port and no interface use the ":port" notation.
+//
+// NOTE: This REPLACES any custom HTTP provider previously set by calling
+// c.SetChallengeProvider with the default HTTP challenge provider.
 func (c *Client) SetHTTPAddress(iface string) error {
 	host, port, err := net.SplitHostPort(iface)
 	if err != nil {
 		return err
 	}
 
-	if chlng, ok := c.solvers["http-01"]; ok {
-		chlng.(*httpChallenge).iface = host
-		chlng.(*httpChallenge).port = port
+	if chlng, ok := c.solvers[HTTP01]; ok {
+		chlng.(*httpChallenge).provider = NewHTTPProviderServer(host, port)
 	}
 
 	return nil
@@ -120,27 +144,26 @@ func (c *Client) SetHTTPAddress(iface string) error {
 // SetTLSAddress specifies a custom interface:port to be used for TLS based challenges.
 // If this option is not used, the default port 443 and all interfaces will be used.
 // To only specify a port and no interface use the ":port" notation.
+//
+// NOTE: This REPLACES any custom TLS-SNI provider previously set by calling
+// c.SetChallengeProvider with the default TLS-SNI challenge provider.
 func (c *Client) SetTLSAddress(iface string) error {
 	host, port, err := net.SplitHostPort(iface)
 	if err != nil {
 		return err
 	}
 
-	if chlng, ok := c.solvers["tls-sni-01"]; ok {
-		chlng.(*tlsSNIChallenge).iface = host
-		chlng.(*tlsSNIChallenge).port = port
+	if chlng, ok := c.solvers[TLSSNI01]; ok {
+		chlng.(*tlsSNIChallenge).provider = NewTLSProviderServer(host, port)
 	}
-
 	return nil
 }
 
 // ExcludeChallenges explicitly removes challenges from the pool for solving.
-func (c *Client) ExcludeChallenges(challenges []string) {
+func (c *Client) ExcludeChallenges(challenges []Challenge) {
 	// Loop through all challenges and delete the requested one if found.
 	for _, challenge := range challenges {
-		if _, ok := c.solvers[challenge]; ok {
-			delete(c.solvers, challenge)
-		}
+		delete(c.solvers, challenge)
 	}
 }
 
@@ -161,15 +184,31 @@ func (c *Client) Register() (*RegistrationResource, error) {
 	}
 
 	var serverReg Registration
+	var regURI string
 	hdr, err := postJSON(c.jws, c.directory.NewRegURL, regMsg, &serverReg)
 	if err != nil {
-		return nil, err
+		remoteErr, ok := err.(RemoteError)
+		if ok && remoteErr.StatusCode == 409 {
+			regURI = hdr.Get("Location")
+			regMsg = registrationMessage{
+				Resource: "reg",
+			}
+			if hdr, err = postJSON(c.jws, regURI, regMsg, &serverReg); err != nil {
+				return nil, err
+			}
+		} else {
+			return nil, err
+		}
 	}
 
 	reg := &RegistrationResource{Body: serverReg}
 
 	links := parseLinks(hdr["Link"])
-	reg.URI = hdr.Get("Location")
+
+	if regURI == "" {
+		regURI = hdr.Get("Location")
+	}
+	reg.URI = regURI
 	if links["terms-of-service"] != "" {
 		reg.TosURL = links["terms-of-service"]
 	}
@@ -183,15 +222,138 @@ func (c *Client) Register() (*RegistrationResource, error) {
 	return reg, nil
 }
 
+// DeleteRegistration deletes the client's user registration from the ACME
+// server.
+func (c *Client) DeleteRegistration() error {
+	if c == nil || c.user == nil {
+		return errors.New("acme: cannot unregister a nil client or user")
+	}
+	logf("[INFO] acme: Deleting account for %s", c.user.GetEmail())
+
+	regMsg := registrationMessage{
+		Resource: "reg",
+		Delete:   true,
+	}
+
+	_, err := postJSON(c.jws, c.user.GetRegistration().URI, regMsg, nil)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// QueryRegistration runs a POST request on the client's registration and
+// returns the result.
+//
+// This is similar to the Register function, but acting on an existing
+// registration link and resource.
+func (c *Client) QueryRegistration() (*RegistrationResource, error) {
+	if c == nil || c.user == nil {
+		return nil, errors.New("acme: cannot query the registration of a nil client or user")
+	}
+	// Log the URL here instead of the email as the email may not be set
+	logf("[INFO] acme: Querying account for %s", c.user.GetRegistration().URI)
+
+	regMsg := registrationMessage{
+		Resource: "reg",
+	}
+
+	var serverReg Registration
+	hdr, err := postJSON(c.jws, c.user.GetRegistration().URI, regMsg, &serverReg)
+	if err != nil {
+		return nil, err
+	}
+
+	reg := &RegistrationResource{Body: serverReg}
+
+	links := parseLinks(hdr["Link"])
+	// Location: header is not returned so this needs to be populated off of
+	// existing URI
+	reg.URI = c.user.GetRegistration().URI
+	if links["terms-of-service"] != "" {
+		reg.TosURL = links["terms-of-service"]
+	}
+
+	if links["next"] != "" {
+		reg.NewAuthzURL = links["next"]
+	} else {
+		return nil, errors.New("acme: No new-authz link in response to registration query")
+	}
+
+	return reg, nil
+}
+
 // AgreeToTOS updates the Client registration and sends the agreement to
 // the server.
 func (c *Client) AgreeToTOS() error {
-	c.user.GetRegistration().Body.Agreement = c.user.GetRegistration().TosURL
-	c.user.GetRegistration().Body.Resource = "reg"
+	reg := c.user.GetRegistration()
+
+	reg.Body.Agreement = c.user.GetRegistration().TosURL
+	reg.Body.Resource = "reg"
 	_, err := postJSON(c.jws, c.user.GetRegistration().URI, c.user.GetRegistration().Body, nil)
 	return err
 }
 
+// ObtainCertificateForCSR tries to obtain a certificate matching the CSR passed into it.
+// The domains are inferred from the CommonName and SubjectAltNames, if any. The private key
+// for this CSR is not required.
+// If bundle is true, the []byte contains both the issuer certificate and
+// your issued certificate as a bundle.
+// This function will never return a partial certificate. If one domain in the list fails,
+// the whole certificate will fail.
+func (c *Client) ObtainCertificateForCSR(csr x509.CertificateRequest, bundle bool) (CertificateResource, map[string]error) {
+	// figure out what domains it concerns
+	// start with the common name
+	domains := []string{csr.Subject.CommonName}
+
+	// loop over the SubjectAltName DNS names
+DNSNames:
+	for _, sanName := range csr.DNSNames {
+		for _, existingName := range domains {
+			if existingName == sanName {
+				// duplicate; skip this name
+				continue DNSNames
+			}
+		}
+
+		// name is unique
+		domains = append(domains, sanName)
+	}
+
+	if bundle {
+		logf("[INFO][%s] acme: Obtaining bundled SAN certificate given a CSR", strings.Join(domains, ", "))
+	} else {
+		logf("[INFO][%s] acme: Obtaining SAN certificate given a CSR", strings.Join(domains, ", "))
+	}
+
+	challenges, failures := c.getChallenges(domains)
+	// If any challenge fails - return. Do not generate partial SAN certificates.
+	if len(failures) > 0 {
+		return CertificateResource{}, failures
+	}
+
+	errs := c.solveChallenges(challenges)
+	// If any challenge fails - return. Do not generate partial SAN certificates.
+	if len(errs) > 0 {
+		return CertificateResource{}, errs
+	}
+
+	logf("[INFO][%s] acme: Validations succeeded; requesting certificates", strings.Join(domains, ", "))
+
+	cert, err := c.requestCertificateForCsr(challenges, bundle, csr.Raw, nil)
+	if err != nil {
+		for _, chln := range challenges {
+			failures[chln.Domain] = err
+		}
+	}
+
+	// Add the CSR to the certificate so that it can be used for renewals.
+	cert.CSR = pemEncode(&csr)
+
+	return cert, failures
+}
+
 // ObtainCertificate tries to obtain a single certificate using all domains passed into it.
 // The first domain in domains is used for the CommonName field of the certificate, all other
 // domains are added using the Subject Alternate Names extension. A new private key is generated
@@ -201,7 +363,7 @@ func (c *Client) AgreeToTOS() error {
 // your issued certificate as a bundle.
 // This function will never return a partial certificate. If one domain in the list fails,
 // the whole certificate will fail.
-func (c *Client) ObtainCertificate(domains []string, bundle bool, privKey crypto.PrivateKey) (CertificateResource, map[string]error) {
+func (c *Client) ObtainCertificate(domains []string, bundle bool, privKey crypto.PrivateKey, mustStaple bool) (CertificateResource, map[string]error) {
 	if bundle {
 		logf("[INFO][%s] acme: Obtaining bundled SAN certificate", strings.Join(domains, ", "))
 	} else {
@@ -222,7 +384,7 @@ func (c *Client) ObtainCertificate(domains []string, bundle bool, privKey crypto
 
 	logf("[INFO][%s] acme: Validations succeeded; requesting certificates", strings.Join(domains, ", "))
 
-	cert, err := c.requestCertificate(challenges, bundle, privKey)
+	cert, err := c.requestCertificate(challenges, bundle, privKey, mustStaple)
 	if err != nil {
 		for _, chln := range challenges {
 			failures[chln.Domain] = err
@@ -258,7 +420,7 @@ func (c *Client) RevokeCertificate(certificate []byte) error {
 // If bundle is true, the []byte contains both the issuer certificate and
 // your issued certificate as a bundle.
 // For private key reuse the PrivateKey property of the passed in CertificateResource should be non-nil.
-func (c *Client) RenewCertificate(cert CertificateResource, bundle bool) (CertificateResource, error) {
+func (c *Client) RenewCertificate(cert CertificateResource, bundle, mustStaple bool) (CertificateResource, error) {
 	// Input certificate is PEM encoded. Decode it here as we may need the decoded
 	// cert later on in the renewal process. The input may be a bundle or a single certificate.
 	certificates, err := parsePEMBundle(cert.Certificate)
@@ -275,48 +437,16 @@ func (c *Client) RenewCertificate(cert CertificateResource, bundle bool) (Certif
 	timeLeft := x509Cert.NotAfter.Sub(time.Now().UTC())
 	logf("[INFO][%s] acme: Trying renewal with %d hours remaining", cert.Domain, int(timeLeft.Hours()))
 
-	// The first step of renewal is to check if we get a renewed cert
-	// directly from the cert URL.
-	resp, err := httpGet(cert.CertURL)
-	if err != nil {
-		return CertificateResource{}, err
-	}
-	defer resp.Body.Close()
-	serverCertBytes, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return CertificateResource{}, err
-	}
-
-	serverCert, err := x509.ParseCertificate(serverCertBytes)
-	if err != nil {
-		return CertificateResource{}, err
-	}
-
-	// If the server responds with a different certificate we are effectively renewed.
-	// TODO: Further test if we can actually use the new certificate (Our private key works)
-	if !x509Cert.Equal(serverCert) {
-		logf("[INFO][%s] acme: Server responded with renewed certificate", cert.Domain)
-		issuedCert := pemEncode(derCertificateBytes(serverCertBytes))
-		// If bundle is true, we want to return a certificate bundle.
-		// To do this, we need the issuer certificate.
-		if bundle {
-			// The issuer certificate link is always supplied via an "up" link
-			// in the response headers of a new certificate.
-			links := parseLinks(resp.Header["Link"])
-			issuerCert, err := c.getIssuerCertificate(links["up"])
-			if err != nil {
-				// If we fail to aquire the issuer cert, return the issued certificate - do not fail.
-				logf("[ERROR][%s] acme: Could not bundle issuer certificate: %v", cert.Domain, err)
-			} else {
-				// Success - append the issuer cert to the issued cert.
-				issuerCert = pemEncode(derCertificateBytes(issuerCert))
-				issuedCert = append(issuedCert, issuerCert...)
-				cert.Certificate = issuedCert
-			}
+	// We always need to request a new certificate to renew.
+	// Start by checking to see if the certificate was based off a CSR, and
+	// use that if it's defined.
+	if len(cert.CSR) > 0 {
+		csr, err := pemDecodeTox509CSR(cert.CSR)
+		if err != nil {
+			return CertificateResource{}, err
 		}
-
-		cert.Certificate = issuedCert
-		return cert, nil
+		newCert, failures := c.ObtainCertificateForCSR(*csr, bundle)
+		return newCert, failures[cert.Domain]
 	}
 
 	var privKey crypto.PrivateKey
@@ -327,7 +457,22 @@ func (c *Client) RenewCertificate(cert CertificateResource, bundle bool) (Certif
 		}
 	}
 
-	newCert, failures := c.ObtainCertificate([]string{cert.Domain}, bundle, privKey)
+	var domains []string
+	var failures map[string]error
+	// check for SAN certificate
+	if len(x509Cert.DNSNames) > 1 {
+		domains = append(domains, x509Cert.Subject.CommonName)
+		for _, sanDomain := range x509Cert.DNSNames {
+			if sanDomain == x509Cert.Subject.CommonName {
+				continue
+			}
+			domains = append(domains, sanDomain)
+		}
+	} else {
+		domains = append(domains, x509Cert.Subject.CommonName)
+	}
+
+	newCert, failures := c.ObtainCertificate(domains, bundle, privKey, mustStaple)
 	return newCert, failures[cert.Domain]
 }
 
@@ -337,6 +482,11 @@ func (c *Client) solveChallenges(challenges []authorizationResource) map[string]
 	// loop through the resources, basically through the domains.
 	failures := make(map[string]error)
 	for _, authz := range challenges {
+		if authz.Body.Status == "valid" {
+			// Boulder might recycle recent validated authz (see issue #267)
+			logf("[INFO][%s] acme: Authorization already valid; skipping challenge", authz.Domain)
+			continue
+		}
 		// no solvers - no solving
 		if solvers := c.chooseSolvers(authz.Body, authz.Domain); solvers != nil {
 			for i, solver := range solvers {
@@ -379,7 +529,11 @@ func (c *Client) chooseSolvers(auth authorization, domain string) map[int]solver
 func (c *Client) getChallenges(domains []string) ([]authorizationResource, map[string]error) {
 	resc, errc := make(chan authorizationResource), make(chan domainError)
 
+	delay := time.Second / overallRequestLimit
+
 	for _, domain := range domains {
+		time.Sleep(delay)
+
 		go func(domain string) {
 			authMsg := authorization{Resource: "new-authz", Identifier: identifier{Type: "dns", Value: domain}}
 			var authz authorization
@@ -392,6 +546,7 @@ func (c *Client) getChallenges(domains []string) ([]authorizationResource, map[s
 			links := parseLinks(hdr["Link"])
 			if links["next"] == "" {
 				logf("[ERROR][%s] acme: Server did not provide next link to proceed", domain)
+				errc <- domainError{Domain: domain, Error: errors.New("Server did not provide next link to proceed")}
 				return
 			}
 
@@ -417,39 +572,57 @@ func (c *Client) getChallenges(domains []string) ([]authorizationResource, map[s
 		}
 	}
 
+	logAuthz(challenges)
+
 	close(resc)
 	close(errc)
 
 	return challenges, failures
 }
 
-func (c *Client) requestCertificate(authz []authorizationResource, bundle bool, privKey crypto.PrivateKey) (CertificateResource, error) {
+func logAuthz(authz []authorizationResource) {
+	for _, auth := range authz {
+		logf("[INFO][%s] AuthURL: %s", auth.Domain, auth.AuthURL)
+	}
+}
+
+func (c *Client) requestCertificate(authz []authorizationResource, bundle bool, privKey crypto.PrivateKey, mustStaple bool) (CertificateResource, error) {
 	if len(authz) == 0 {
 		return CertificateResource{}, errors.New("Passed no authorizations to requestCertificate!")
 	}
 
-	commonName := authz[0]
 	var err error
 	if privKey == nil {
-		privKey, err = generatePrivateKey(rsakey, c.keyBits)
+		privKey, err = generatePrivateKey(c.keyType)
 		if err != nil {
 			return CertificateResource{}, err
 		}
 	}
 
+	// determine certificate name(s) based on the authorization resources
+	commonName := authz[0]
 	var san []string
-	var authURLs []string
 	for _, auth := range authz[1:] {
 		san = append(san, auth.Domain)
-		authURLs = append(authURLs, auth.AuthURL)
 	}
 
 	// TODO: should the CSR be customizable?
-	csr, err := generateCsr(privKey.(*rsa.PrivateKey), commonName.Domain, san)
+	csr, err := generateCsr(privKey, commonName.Domain, san, mustStaple)
 	if err != nil {
 		return CertificateResource{}, err
 	}
 
+	return c.requestCertificateForCsr(authz, bundle, csr, pemEncode(privKey))
+}
+
+func (c *Client) requestCertificateForCsr(authz []authorizationResource, bundle bool, csr []byte, privateKeyPem []byte) (CertificateResource, error) {
+	commonName := authz[0]
+
+	var authURLs []string
+	for _, auth := range authz[1:] {
+		authURLs = append(authURLs, auth.AuthURL)
+	}
+
 	csrString := base64.URLEncoding.EncodeToString(csr)
 	jsonBytes, err := json.Marshal(csrMessage{Resource: "new-cert", Csr: csrString, Authorizations: authURLs})
 	if err != nil {
@@ -461,89 +634,108 @@ func (c *Client) requestCertificate(authz []authorizationResource, bundle bool,
 		return CertificateResource{}, err
 	}
 
-	privateKeyPem := pemEncode(privKey)
-	cerRes := CertificateResource{
+	certRes := CertificateResource{
 		Domain:     commonName.Domain,
 		CertURL:    resp.Header.Get("Location"),
-		PrivateKey: privateKeyPem}
+		PrivateKey: privateKeyPem,
+	}
 
-	for {
-		switch resp.StatusCode {
-		case 201, 202:
-			cert, err := ioutil.ReadAll(limitReader(resp.Body, 1024*1024))
-			resp.Body.Close()
-			if err != nil {
-				return CertificateResource{}, err
-			}
-
-			// The server returns a body with a length of zero if the
-			// certificate was not ready at the time this request completed.
-			// Otherwise the body is the certificate.
-			if len(cert) > 0 {
-
-				cerRes.CertStableURL = resp.Header.Get("Content-Location")
-
-				issuedCert := pemEncode(derCertificateBytes(cert))
-				// If bundle is true, we want to return a certificate bundle.
-				// To do this, we need the issuer certificate.
-				if bundle {
-					// The issuer certificate link is always supplied via an "up" link
-					// in the response headers of a new certificate.
-					links := parseLinks(resp.Header["Link"])
-					issuerCert, err := c.getIssuerCertificate(links["up"])
-					if err != nil {
-						// If we fail to aquire the issuer cert, return the issued certificate - do not fail.
-						logf("[WARNING][%s] acme: Could not bundle issuer certificate: %v", commonName.Domain, err)
-					} else {
-						// Success - append the issuer cert to the issued cert.
-						issuerCert = pemEncode(derCertificateBytes(issuerCert))
-						issuedCert = append(issuedCert, issuerCert...)
-					}
-				}
-
-				cerRes.Certificate = issuedCert
-				logf("[INFO][%s] Server responded with a certificate.", commonName.Domain)
-				return cerRes, nil
-			}
-
-			// The certificate was granted but is not yet issued.
-			// Check retry-after and loop.
-			ra := resp.Header.Get("Retry-After")
-			retryAfter, err := strconv.Atoi(ra)
-			if err != nil {
-				return CertificateResource{}, err
-			}
-
-			logf("[INFO][%s] acme: Server responded with status 202; retrying after %ds", commonName.Domain, retryAfter)
-			time.Sleep(time.Duration(retryAfter) * time.Second)
-
-			break
-		default:
-			return CertificateResource{}, handleHTTPError(resp)
+	maxChecks := 1000
+	for i := 0; i < maxChecks; i++ {
+		done, err := c.checkCertResponse(resp, &certRes, bundle)
+		resp.Body.Close()
+		if err != nil {
+			return CertificateResource{}, err
 		}
-
-		resp, err = httpGet(cerRes.CertURL)
+		if done {
+			break
+		}
+		if i == maxChecks-1 {
+			return CertificateResource{}, fmt.Errorf("polled for certificate %d times; giving up", i)
+		}
+		resp, err = httpGet(certRes.CertURL)
 		if err != nil {
 			return CertificateResource{}, err
 		}
 	}
+
+	return certRes, nil
 }
 
-// getIssuerCertificate requests the issuer certificate and caches it for
-// subsequent requests.
+// checkCertResponse checks resp to see if a certificate is contained in the
+// response, and if so, loads it into certRes and returns true. If the cert
+// is not yet ready, it returns false. This function honors the waiting period
+// required by the Retry-After header of the response, if specified. This
+// function may read from resp.Body but does NOT close it. The certRes input
+// should already have the Domain (common name) field populated. If bundle is
+// true, the certificate will be bundled with the issuer's cert.
+func (c *Client) checkCertResponse(resp *http.Response, certRes *CertificateResource, bundle bool) (bool, error) {
+	switch resp.StatusCode {
+	case 201, 202:
+		cert, err := ioutil.ReadAll(limitReader(resp.Body, maxBodySize))
+		if err != nil {
+			return false, err
+		}
+
+		// The server returns a body with a length of zero if the
+		// certificate was not ready at the time this request completed.
+		// Otherwise the body is the certificate.
+		if len(cert) > 0 {
+			certRes.CertStableURL = resp.Header.Get("Content-Location")
+			certRes.AccountRef = c.user.GetRegistration().URI
+
+			issuedCert := pemEncode(derCertificateBytes(cert))
+
+			// The issuer certificate link is always supplied via an "up" link
+			// in the response headers of a new certificate.
+			links := parseLinks(resp.Header["Link"])
+			issuerCert, err := c.getIssuerCertificate(links["up"])
+			if err != nil {
+				// If we fail to acquire the issuer cert, return the issued certificate - do not fail.
+				logf("[WARNING][%s] acme: Could not bundle issuer certificate: %v", certRes.Domain, err)
+			} else {
+				issuerCert = pemEncode(derCertificateBytes(issuerCert))
+
+				// If bundle is true, we want to return a certificate bundle.
+				// To do this, we append the issuer cert to the issued cert.
+				if bundle {
+					issuedCert = append(issuedCert, issuerCert...)
+				}
+			}
+
+			certRes.Certificate = issuedCert
+			certRes.IssuerCertificate = issuerCert
+			logf("[INFO][%s] Server responded with a certificate.", certRes.Domain)
+			return true, nil
+		}
+
+		// The certificate was granted but is not yet issued.
+		// Check retry-after and loop.
+		ra := resp.Header.Get("Retry-After")
+		retryAfter, err := strconv.Atoi(ra)
+		if err != nil {
+			return false, err
+		}
+
+		logf("[INFO][%s] acme: Server responded with status 202; retrying after %ds", certRes.Domain, retryAfter)
+		time.Sleep(time.Duration(retryAfter) * time.Second)
+
+		return false, nil
+	default:
+		return false, handleHTTPError(resp)
+	}
+}
+
+// getIssuerCertificate requests the issuer certificate
 func (c *Client) getIssuerCertificate(url string) ([]byte, error) {
 	logf("[INFO] acme: Requesting issuer cert from %s", url)
-	if c.issuerCert != nil {
-		return c.issuerCert, nil
-	}
-
 	resp, err := httpGet(url)
 	if err != nil {
 		return nil, err
 	}
 	defer resp.Body.Close()
 
-	issuerBytes, err := ioutil.ReadAll(limitReader(resp.Body, 1024*1024))
+	issuerBytes, err := ioutil.ReadAll(limitReader(resp.Body, maxBodySize))
 	if err != nil {
 		return nil, err
 	}
@@ -553,7 +745,6 @@ func (c *Client) getIssuerCertificate(url string) ([]byte, error) {
 		return nil, err
 	}
 
-	c.issuerCert = issuerBytes
 	return issuerBytes, err
 }
 

vendor/github.com/xenolf/lego/acme/client_test.go

@@ -1,196 +0,0 @@
-package acme
-
-import (
-	"crypto/rand"
-	"crypto/rsa"
-	"encoding/json"
-	"net"
-	"net/http"
-	"net/http/httptest"
-	"strings"
-	"testing"
-)
-
-func TestNewClient(t *testing.T) {
-	keyBits := 32 // small value keeps test fast
-	key, err := rsa.GenerateKey(rand.Reader, keyBits)
-	if err != nil {
-		t.Fatal("Could not generate test key:", err)
-	}
-	user := mockUser{
-		email:      "test@test.com",
-		regres:     new(RegistrationResource),
-		privatekey: key,
-	}
-
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		data, _ := json.Marshal(directory{NewAuthzURL: "http://test", NewCertURL: "http://test", NewRegURL: "http://test", RevokeCertURL: "http://test"})
-		w.Write(data)
-	}))
-
-	client, err := NewClient(ts.URL, user, keyBits)
-	if err != nil {
-		t.Fatalf("Could not create client: %v", err)
-	}
-
-	if client.jws == nil {
-		t.Fatalf("Expected client.jws to not be nil")
-	}
-	if expected, actual := key, client.jws.privKey; actual != expected {
-		t.Errorf("Expected jws.privKey to be %p but was %p", expected, actual)
-	}
-
-	if client.keyBits != keyBits {
-		t.Errorf("Expected keyBits to be %d but was %d", keyBits, client.keyBits)
-	}
-
-	if expected, actual := 2, len(client.solvers); actual != expected {
-		t.Fatalf("Expected %d solver(s), got %d", expected, actual)
-	}
-}
-
-func TestClientOptPort(t *testing.T) {
-	keyBits := 32 // small value keeps test fast
-	key, err := rsa.GenerateKey(rand.Reader, keyBits)
-	if err != nil {
-		t.Fatal("Could not generate test key:", err)
-	}
-	user := mockUser{
-		email:      "test@test.com",
-		regres:     new(RegistrationResource),
-		privatekey: key,
-	}
-
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		data, _ := json.Marshal(directory{NewAuthzURL: "http://test", NewCertURL: "http://test", NewRegURL: "http://test", RevokeCertURL: "http://test"})
-		w.Write(data)
-	}))
-
-	optPort := "1234"
-	optHost := ""
-	client, err := NewClient(ts.URL, user, keyBits)
-	if err != nil {
-		t.Fatalf("Could not create client: %v", err)
-	}
-	client.SetHTTPAddress(net.JoinHostPort(optHost, optPort))
-	client.SetTLSAddress(net.JoinHostPort(optHost, optPort))
-
-	httpSolver, ok := client.solvers["http-01"].(*httpChallenge)
-	if !ok {
-		t.Fatal("Expected http-01 solver to be httpChallenge type")
-	}
-	if httpSolver.jws != client.jws {
-		t.Error("Expected http-01 to have same jws as client")
-	}
-	if httpSolver.port != optPort {
-		t.Errorf("Expected http-01 to have port %s but was %s", optPort, httpSolver.port)
-	}
-	if httpSolver.iface != optHost {
-		t.Errorf("Expected http-01 to have iface %s but was %s", optHost, httpSolver.iface)
-	}
-
-	httpsSolver, ok := client.solvers["tls-sni-01"].(*tlsSNIChallenge)
-	if !ok {
-		t.Fatal("Expected tls-sni-01 solver to be httpChallenge type")
-	}
-	if httpsSolver.jws != client.jws {
-		t.Error("Expected tls-sni-01 to have same jws as client")
-	}
-	if httpsSolver.port != optPort {
-		t.Errorf("Expected tls-sni-01 to have port %s but was %s", optPort, httpSolver.port)
-	}
-	if httpsSolver.port != optPort {
-		t.Errorf("Expected tls-sni-01 to have port %s but was %s", optHost, httpSolver.iface)
-	}
-
-	// test setting different host
-	optHost = "127.0.0.1"
-	client.SetHTTPAddress(net.JoinHostPort(optHost, optPort))
-	client.SetTLSAddress(net.JoinHostPort(optHost, optPort))
-
-	if httpSolver.iface != optHost {
-		t.Errorf("Expected http-01 to have iface %s but was %s", optHost, httpSolver.iface)
-	}
-	if httpsSolver.port != optPort {
-		t.Errorf("Expected tls-sni-01 to have port %s but was %s", optHost, httpSolver.iface)
-	}
-}
-
-func TestValidate(t *testing.T) {
-	var statuses []string
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		// Minimal stub ACME server for validation.
-		w.Header().Add("Replay-Nonce", "12345")
-		w.Header().Add("Retry-After", "0")
-		switch r.Method {
-		case "HEAD":
-		case "POST":
-			st := statuses[0]
-			statuses = statuses[1:]
-			writeJSONResponse(w, &challenge{Type: "http-01", Status: st, URI: "http://example.com/", Token: "token"})
-
-		case "GET":
-			st := statuses[0]
-			statuses = statuses[1:]
-			writeJSONResponse(w, &challenge{Type: "http-01", Status: st, URI: "http://example.com/", Token: "token"})
-
-		default:
-			http.Error(w, r.Method, http.StatusMethodNotAllowed)
-		}
-	}))
-	defer ts.Close()
-
-	privKey, _ := generatePrivateKey(rsakey, 512)
-	j := &jws{privKey: privKey.(*rsa.PrivateKey), directoryURL: ts.URL}
-
-	tsts := []struct {
-		name     string
-		statuses []string
-		want     string
-	}{
-		{"POST-unexpected", []string{"weird"}, "unexpected"},
-		{"POST-valid", []string{"valid"}, ""},
-		{"POST-invalid", []string{"invalid"}, "Error Detail"},
-		{"GET-unexpected", []string{"pending", "weird"}, "unexpected"},
-		{"GET-valid", []string{"pending", "valid"}, ""},
-		{"GET-invalid", []string{"pending", "invalid"}, "Error Detail"},
-	}
-
-	for _, tst := range tsts {
-		statuses = tst.statuses
-		if err := validate(j, "example.com", ts.URL, challenge{Type: "http-01", Token: "token"}); err == nil && tst.want != "" {
-			t.Errorf("[%s] validate: got error %v, want something with %q", tst.name, err, tst.want)
-		} else if err != nil && !strings.Contains(err.Error(), tst.want) {
-			t.Errorf("[%s] validate: got error %v, want something with %q", tst.name, err, tst.want)
-		}
-	}
-}
-
-// writeJSONResponse marshals the body as JSON and writes it to the response.
-func writeJSONResponse(w http.ResponseWriter, body interface{}) {
-	bs, err := json.Marshal(body)
-	if err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-		return
-	}
-
-	w.Header().Set("Content-Type", "application/json")
-	if _, err := w.Write(bs); err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-	}
-}
-
-// stubValidate is like validate, except it does nothing.
-func stubValidate(j *jws, domain, uri string, chlng challenge) error {
-	return nil
-}
-
-type mockUser struct {
-	email      string
-	regres     *RegistrationResource
-	privatekey *rsa.PrivateKey
-}
-
-func (u mockUser) GetEmail() string                       { return u.email }
-func (u mockUser) GetRegistration() *RegistrationResource { return u.regres }
-func (u mockUser) GetPrivateKey() *rsa.PrivateKey         { return u.privatekey }

vendor/github.com/xenolf/lego/acme/crypto.go

@@ -10,7 +10,6 @@ import (
 	"crypto/x509"
 	"crypto/x509/pkix"
 	"encoding/base64"
-	"encoding/binary"
 	"encoding/pem"
 	"errors"
 	"fmt"
@@ -21,16 +20,22 @@ import (
 	"strings"
 	"time"
 
+	"encoding/asn1"
+
 	"golang.org/x/crypto/ocsp"
-	"golang.org/x/crypto/sha3"
 )
 
-type keyType int
+// KeyType represents the key algo as well as the key size or curve to use.
+type KeyType string
 type derCertificateBytes []byte
 
+// Constants for all key types we support.
 const (
-	eckey keyType = iota
-	rsakey
+	EC256   = KeyType("P256")
+	EC384   = KeyType("P384")
+	RSA2048 = KeyType("2048")
+	RSA4096 = KeyType("4096")
+	RSA8192 = KeyType("8192")
 )
 
 const (
@@ -44,6 +49,12 @@ const (
 	OCSPServerFailed = ocsp.ServerFailed
 )
 
+// Constants for OCSP must staple
+var (
+	tlsFeatureExtensionOID = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 1, 24}
+	ocspMustStapleFeature  = []byte{0x30, 0x03, 0x02, 0x01, 0x05}
+)
+
 // GetOCSPForCert takes a PEM encoded cert or cert bundle returning the raw OCSP response,
 // the parsed response, and an error, if any. The returned []byte can be passed directly
 // into the OCSPStaple property of a tls.Certificate. If the bundle only contains the
@@ -56,14 +67,22 @@ func GetOCSPForCert(bundle []byte) ([]byte, *ocsp.Response, error) {
 		return nil, nil, err
 	}
 
-	// We only got one certificate, means we have no issuer certificate - get it.
+	// We expect the certificate slice to be ordered downwards the chain.
+	// SRV CRT -> CA. We need to pull the leaf and issuer certs out of it,
+	// which should always be the first two certificates. If there's no
+	// OCSP server listed in the leaf cert, there's nothing to do. And if
+	// we have only one certificate so far, we need to get the issuer cert.
+	issuedCert := certificates[0]
+	if len(issuedCert.OCSPServer) == 0 {
+		return nil, nil, errors.New("no OCSP server specified in cert")
+	}
 	if len(certificates) == 1 {
 		// TODO: build fallback. If this fails, check the remaining array entries.
-		if len(certificates[0].IssuingCertificateURL) == 0 {
+		if len(issuedCert.IssuingCertificateURL) == 0 {
 			return nil, nil, errors.New("no issuing certificate URL")
 		}
 
-		resp, err := httpGet(certificates[0].IssuingCertificateURL[0])
+		resp, err := httpGet(issuedCert.IssuingCertificateURL[0])
 		if err != nil {
 			return nil, nil, err
 		}
@@ -83,11 +102,6 @@ func GetOCSPForCert(bundle []byte) ([]byte, *ocsp.Response, error) {
 		// We want it ordered right SRV CRT -> CA
 		certificates = append(certificates, issuerCert)
 	}
-
-	// We expect the certificate slice to be ordered downwards the chain.
-	// SRV CRT -> CA. We need to pull the cert and issuer cert out of it,
-	// which should always be the last two certificates.
-	issuedCert := certificates[0]
 	issuerCert := certificates[1]
 
 	// Finally kick off the OCSP request.
@@ -109,19 +123,20 @@ func GetOCSPForCert(bundle []byte) ([]byte, *ocsp.Response, error) {
 		return nil, nil, err
 	}
 
-	if ocspRes.Certificate == nil {
-		err = ocspRes.CheckSignatureFrom(issuerCert)
-		if err != nil {
-			return nil, nil, err
-		}
-	}
-
 	return ocspResBytes, ocspRes, nil
 }
 
 func getKeyAuthorization(token string, key interface{}) (string, error) {
+	var publicKey crypto.PublicKey
+	switch k := key.(type) {
+	case *ecdsa.PrivateKey:
+		publicKey = k.Public()
+	case *rsa.PrivateKey:
+		publicKey = k.Public()
+	}
+
 	// Generate the Key Authorization for the challenge
-	jwk := keyAsJWK(key)
+	jwk := keyAsJWK(publicKey)
 	if jwk == nil {
 		return "", errors.New("Could not generate JWK from key.")
 	}
@@ -140,39 +155,6 @@ func getKeyAuthorization(token string, key interface{}) (string, error) {
 	return token + "." + keyThumb, nil
 }
 
-// Derive the shared secret according to acme spec 5.6
-func performECDH(priv *ecdsa.PrivateKey, pub *ecdsa.PublicKey, outLen int, label string) []byte {
-	// Derive Z from the private and public keys according to SEC 1 Ver. 2.0 - 3.3.1
-	Z, _ := priv.PublicKey.ScalarMult(pub.X, pub.Y, priv.D.Bytes())
-
-	if len(Z.Bytes())+len(label)+4 > 384 {
-		return nil
-	}
-
-	if outLen < 384*(2^32-1) {
-		return nil
-	}
-
-	// Derive the shared secret key using the ANS X9.63 KDF - SEC 1 Ver. 2.0 - 3.6.1
-	hasher := sha3.New384()
-	buffer := make([]byte, outLen)
-	bufferLen := 0
-	for i := 0; i < outLen/384; i++ {
-		hasher.Reset()
-
-		// Ki = Hash(Z || Counter || [SharedInfo])
-		hasher.Write(Z.Bytes())
-		binary.Write(hasher, binary.BigEndian, i)
-		hasher.Write([]byte(label))
-
-		hash := hasher.Sum(nil)
-		copied := copy(buffer[bufferLen:], hash)
-		bufferLen += copied
-	}
-
-	return buffer
-}
-
 // parsePEMBundle parses a certificate bundle from top to bottom and returns
 // a slice of x509 certificates. This function will error if no certificates are found.
 func parsePEMBundle(bundle []byte) ([]*x509.Certificate, error) {
@@ -214,18 +196,25 @@ func parsePEMPrivateKey(key []byte) (crypto.PrivateKey, error) {
 	}
 }
 
-func generatePrivateKey(t keyType, keyLength int) (crypto.PrivateKey, error) {
-	switch t {
-	case eckey:
+func generatePrivateKey(keyType KeyType) (crypto.PrivateKey, error) {
+
+	switch keyType {
+	case EC256:
+		return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	case EC384:
 		return ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
-	case rsakey:
-		return rsa.GenerateKey(rand.Reader, keyLength)
+	case RSA2048:
+		return rsa.GenerateKey(rand.Reader, 2048)
+	case RSA4096:
+		return rsa.GenerateKey(rand.Reader, 4096)
+	case RSA8192:
+		return rsa.GenerateKey(rand.Reader, 8192)
 	}
 
-	return nil, fmt.Errorf("Invalid keytype: %d", t)
+	return nil, fmt.Errorf("Invalid KeyType: %s", keyType)
 }
 
-func generateCsr(privateKey *rsa.PrivateKey, domain string, san []string) ([]byte, error) {
+func generateCsr(privateKey crypto.PrivateKey, domain string, san []string, mustStaple bool) ([]byte, error) {
 	template := x509.CertificateRequest{
 		Subject: pkix.Name{
 			CommonName: domain,
@@ -236,15 +225,28 @@ func generateCsr(privateKey *rsa.PrivateKey, domain string, san []string) ([]byt
 		template.DNSNames = san
 	}
 
+	if mustStaple {
+		template.ExtraExtensions = append(template.ExtraExtensions, pkix.Extension{
+			Id:    tlsFeatureExtensionOID,
+			Value: ocspMustStapleFeature,
+		})
+	}
+
 	return x509.CreateCertificateRequest(rand.Reader, &template, privateKey)
 }
 
 func pemEncode(data interface{}) []byte {
 	var pemBlock *pem.Block
 	switch key := data.(type) {
+	case *ecdsa.PrivateKey:
+		keyBytes, _ := x509.MarshalECPrivateKey(key)
+		pemBlock = &pem.Block{Type: "EC PRIVATE KEY", Bytes: keyBytes}
 	case *rsa.PrivateKey:
 		pemBlock = &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)}
 		break
+	case *x509.CertificateRequest:
+		pemBlock = &pem.Block{Type: "CERTIFICATE REQUEST", Bytes: key.Raw}
+		break
 	case derCertificateBytes:
 		pemBlock = &pem.Block{Type: "CERTIFICATE", Bytes: []byte(data.(derCertificateBytes))}
 	}
@@ -270,6 +272,19 @@ func pemDecodeTox509(pem []byte) (*x509.Certificate, error) {
 	return x509.ParseCertificate(pemBlock.Bytes)
 }
 
+func pemDecodeTox509CSR(pem []byte) (*x509.CertificateRequest, error) {
+	pemBlock, err := pemDecode(pem)
+	if pemBlock == nil {
+		return nil, err
+	}
+
+	if pemBlock.Type != "CERTIFICATE REQUEST" {
+		return nil, fmt.Errorf("PEM block is not a certificate request")
+	}
+
+	return x509.ParseCertificateRequest(pemBlock.Bytes)
+}
+
 // GetPEMCertExpiration returns the "NotAfter" date of a PEM encoded certificate.
 // The certificate has to be PEM encoded. Any other encodings like DER will fail.
 func GetPEMCertExpiration(cert []byte) (time.Time, error) {

vendor/github.com/xenolf/lego/acme/crypto_test.go

@@ -1,92 +0,0 @@
-package acme
-
-import (
-	"bytes"
-	"crypto/rsa"
-	"testing"
-	"time"
-)
-
-func TestGeneratePrivateKey(t *testing.T) {
-	key, err := generatePrivateKey(rsakey, 32)
-	if err != nil {
-		t.Error("Error generating private key:", err)
-	}
-	if key == nil {
-		t.Error("Expected key to not be nil, but it was")
-	}
-}
-
-func TestGenerateCSR(t *testing.T) {
-	key, err := generatePrivateKey(rsakey, 512)
-	if err != nil {
-		t.Fatal("Error generating private key:", err)
-	}
-
-	csr, err := generateCsr(key.(*rsa.PrivateKey), "fizz.buzz", nil)
-	if err != nil {
-		t.Error("Error generating CSR:", err)
-	}
-	if csr == nil || len(csr) == 0 {
-		t.Error("Expected CSR with data, but it was nil or length 0")
-	}
-}
-
-func TestPEMEncode(t *testing.T) {
-	buf := bytes.NewBufferString("TestingRSAIsSoMuchFun")
-
-	reader := MockRandReader{b: buf}
-	key, err := rsa.GenerateKey(reader, 32)
-	if err != nil {
-		t.Fatal("Error generating private key:", err)
-	}
-
-	data := pemEncode(key)
-
-	if data == nil {
-		t.Fatal("Expected result to not be nil, but it was")
-	}
-	if len(data) != 127 {
-		t.Errorf("Expected PEM encoding to be length 127, but it was %d", len(data))
-	}
-}
-
-func TestPEMCertExpiration(t *testing.T) {
-	privKey, err := generatePrivateKey(rsakey, 2048)
-	if err != nil {
-		t.Fatal("Error generating private key:", err)
-	}
-
-	expiration := time.Now().Add(365)
-	expiration = expiration.Round(time.Second)
-	certBytes, err := generateDerCert(privKey.(*rsa.PrivateKey), expiration, "test.com")
-	if err != nil {
-		t.Fatal("Error generating cert:", err)
-	}
-
-	buf := bytes.NewBufferString("TestingRSAIsSoMuchFun")
-
-	// Some random string should return an error.
-	if ctime, err := GetPEMCertExpiration(buf.Bytes()); err == nil {
-		t.Errorf("Expected getCertExpiration to return an error for garbage string but returned %v", ctime)
-	}
-
-	// A DER encoded certificate should return an error.
-	if _, err := GetPEMCertExpiration(certBytes); err == nil {
-		t.Errorf("Expected getCertExpiration to return an error for DER certificates but returned none.")
-	}
-
-	// A PEM encoded certificate should work ok.
-	pemCert := pemEncode(derCertificateBytes(certBytes))
-	if ctime, err := GetPEMCertExpiration(pemCert); err != nil || !ctime.Equal(expiration.UTC()) {
-		t.Errorf("Expected getCertExpiration to return %v but returned %v. Error: %v", expiration, ctime, err)
-	}
-}
-
-type MockRandReader struct {
-	b *bytes.Buffer
-}
-
-func (r MockRandReader) Read(p []byte) (int, error) {
-	return r.b.Read(p)
-}

vendor/github.com/xenolf/lego/acme/dns_challenge.go

@@ -1 +1,305 @@
 package acme
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"log"
+	"net"
+	"strings"
+	"time"
+
+	"github.com/miekg/dns"
+	"golang.org/x/net/publicsuffix"
+)
+
+type preCheckDNSFunc func(fqdn, value string) (bool, error)
+
+var (
+	// PreCheckDNS checks DNS propagation before notifying ACME that
+	// the DNS challenge is ready.
+	PreCheckDNS preCheckDNSFunc = checkDNSPropagation
+	fqdnToZone                  = map[string]string{}
+)
+
+const defaultResolvConf = "/etc/resolv.conf"
+
+var defaultNameservers = []string{
+	"google-public-dns-a.google.com:53",
+	"google-public-dns-b.google.com:53",
+}
+
+var RecursiveNameservers = getNameservers(defaultResolvConf, defaultNameservers)
+
+// DNSTimeout is used to override the default DNS timeout of 10 seconds.
+var DNSTimeout = 10 * time.Second
+
+// getNameservers attempts to get systems nameservers before falling back to the defaults
+func getNameservers(path string, defaults []string) []string {
+	config, err := dns.ClientConfigFromFile(path)
+	if err != nil || len(config.Servers) == 0 {
+		return defaults
+	}
+
+	systemNameservers := []string{}
+	for _, server := range config.Servers {
+		// ensure all servers have a port number
+		if _, _, err := net.SplitHostPort(server); err != nil {
+			systemNameservers = append(systemNameservers, net.JoinHostPort(server, "53"))
+		} else {
+			systemNameservers = append(systemNameservers, server)
+		}
+	}
+	return systemNameservers
+}
+
+// DNS01Record returns a DNS record which will fulfill the `dns-01` challenge
+func DNS01Record(domain, keyAuth string) (fqdn string, value string, ttl int) {
+	keyAuthShaBytes := sha256.Sum256([]byte(keyAuth))
+	// base64URL encoding without padding
+	keyAuthSha := base64.URLEncoding.EncodeToString(keyAuthShaBytes[:sha256.Size])
+	value = strings.TrimRight(keyAuthSha, "=")
+	ttl = 120
+	fqdn = fmt.Sprintf("_acme-challenge.%s.", domain)
+	return
+}
+
+// dnsChallenge implements the dns-01 challenge according to ACME 7.5
+type dnsChallenge struct {
+	jws      *jws
+	validate validateFunc
+	provider ChallengeProvider
+}
+
+func (s *dnsChallenge) Solve(chlng challenge, domain string) error {
+	logf("[INFO][%s] acme: Trying to solve DNS-01", domain)
+
+	if s.provider == nil {
+		return errors.New("No DNS Provider configured")
+	}
+
+	// Generate the Key Authorization for the challenge
+	keyAuth, err := getKeyAuthorization(chlng.Token, s.jws.privKey)
+	if err != nil {
+		return err
+	}
+
+	err = s.provider.Present(domain, chlng.Token, keyAuth)
+	if err != nil {
+		return fmt.Errorf("Error presenting token: %s", err)
+	}
+	defer func() {
+		err := s.provider.CleanUp(domain, chlng.Token, keyAuth)
+		if err != nil {
+			log.Printf("Error cleaning up %s: %v ", domain, err)
+		}
+	}()
+
+	fqdn, value, _ := DNS01Record(domain, keyAuth)
+
+	logf("[INFO][%s] Checking DNS record propagation using %+v", domain, RecursiveNameservers)
+
+	var timeout, interval time.Duration
+	switch provider := s.provider.(type) {
+	case ChallengeProviderTimeout:
+		timeout, interval = provider.Timeout()
+	default:
+		timeout, interval = 60*time.Second, 2*time.Second
+	}
+
+	err = WaitFor(timeout, interval, func() (bool, error) {
+		return PreCheckDNS(fqdn, value)
+	})
+	if err != nil {
+		return err
+	}
+
+	return s.validate(s.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
+}
+
+// checkDNSPropagation checks if the expected TXT record has been propagated to all authoritative nameservers.
+func checkDNSPropagation(fqdn, value string) (bool, error) {
+	// Initial attempt to resolve at the recursive NS
+	r, err := dnsQuery(fqdn, dns.TypeTXT, RecursiveNameservers, true)
+	if err != nil {
+		return false, err
+	}
+	if r.Rcode == dns.RcodeSuccess {
+		// If we see a CNAME here then use the alias
+		for _, rr := range r.Answer {
+			if cn, ok := rr.(*dns.CNAME); ok {
+				if cn.Hdr.Name == fqdn {
+					fqdn = cn.Target
+					break
+				}
+			}
+		}
+	}
+
+	authoritativeNss, err := lookupNameservers(fqdn)
+	if err != nil {
+		return false, err
+	}
+
+	return checkAuthoritativeNss(fqdn, value, authoritativeNss)
+}
+
+// checkAuthoritativeNss queries each of the given nameservers for the expected TXT record.
+func checkAuthoritativeNss(fqdn, value string, nameservers []string) (bool, error) {
+	for _, ns := range nameservers {
+		r, err := dnsQuery(fqdn, dns.TypeTXT, []string{net.JoinHostPort(ns, "53")}, false)
+		if err != nil {
+			return false, err
+		}
+
+		if r.Rcode != dns.RcodeSuccess {
+			return false, fmt.Errorf("NS %s returned %s for %s", ns, dns.RcodeToString[r.Rcode], fqdn)
+		}
+
+		var found bool
+		for _, rr := range r.Answer {
+			if txt, ok := rr.(*dns.TXT); ok {
+				if strings.Join(txt.Txt, "") == value {
+					found = true
+					break
+				}
+			}
+		}
+
+		if !found {
+			return false, fmt.Errorf("NS %s did not return the expected TXT record", ns)
+		}
+	}
+
+	return true, nil
+}
+
+// dnsQuery will query a nameserver, iterating through the supplied servers as it retries
+// The nameserver should include a port, to facilitate testing where we talk to a mock dns server.
+func dnsQuery(fqdn string, rtype uint16, nameservers []string, recursive bool) (in *dns.Msg, err error) {
+	m := new(dns.Msg)
+	m.SetQuestion(fqdn, rtype)
+	m.SetEdns0(4096, false)
+
+	if !recursive {
+		m.RecursionDesired = false
+	}
+
+	// Will retry the request based on the number of servers (n+1)
+	for i := 1; i <= len(nameservers)+1; i++ {
+		ns := nameservers[i%len(nameservers)]
+		udp := &dns.Client{Net: "udp", Timeout: DNSTimeout}
+		in, _, err = udp.Exchange(m, ns)
+
+		if err == dns.ErrTruncated {
+			tcp := &dns.Client{Net: "tcp", Timeout: DNSTimeout}
+			// If the TCP request suceeds, the err will reset to nil
+			in, _, err = tcp.Exchange(m, ns)
+		}
+
+		if err == nil {
+			break
+		}
+	}
+	return
+}
+
+// lookupNameservers returns the authoritative nameservers for the given fqdn.
+func lookupNameservers(fqdn string) ([]string, error) {
+	var authoritativeNss []string
+
+	zone, err := FindZoneByFqdn(fqdn, RecursiveNameservers)
+	if err != nil {
+		return nil, fmt.Errorf("Could not determine the zone: %v", err)
+	}
+
+	r, err := dnsQuery(zone, dns.TypeNS, RecursiveNameservers, true)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, rr := range r.Answer {
+		if ns, ok := rr.(*dns.NS); ok {
+			authoritativeNss = append(authoritativeNss, strings.ToLower(ns.Ns))
+		}
+	}
+
+	if len(authoritativeNss) > 0 {
+		return authoritativeNss, nil
+	}
+	return nil, fmt.Errorf("Could not determine authoritative nameservers")
+}
+
+// FindZoneByFqdn determines the zone apex for the given fqdn by recursing up the
+// domain labels until the nameserver returns a SOA record in the answer section.
+func FindZoneByFqdn(fqdn string, nameservers []string) (string, error) {
+	// Do we have it cached?
+	if zone, ok := fqdnToZone[fqdn]; ok {
+		return zone, nil
+	}
+
+	labelIndexes := dns.Split(fqdn)
+	for _, index := range labelIndexes {
+		domain := fqdn[index:]
+		// Give up if we have reached the TLD
+		if isTLD(domain) {
+			break
+		}
+
+		in, err := dnsQuery(domain, dns.TypeSOA, nameservers, true)
+		if err != nil {
+			return "", err
+		}
+
+		// Any response code other than NOERROR and NXDOMAIN is treated as error
+		if in.Rcode != dns.RcodeNameError && in.Rcode != dns.RcodeSuccess {
+			return "", fmt.Errorf("Unexpected response code '%s' for %s",
+				dns.RcodeToString[in.Rcode], domain)
+		}
+
+		// Check if we got a SOA RR in the answer section
+		if in.Rcode == dns.RcodeSuccess {
+			for _, ans := range in.Answer {
+				if soa, ok := ans.(*dns.SOA); ok {
+					zone := soa.Hdr.Name
+					fqdnToZone[fqdn] = zone
+					return zone, nil
+				}
+			}
+		}
+	}
+
+	return "", fmt.Errorf("Could not find the start of authority")
+}
+
+func isTLD(domain string) bool {
+	publicsuffix, _ := publicsuffix.PublicSuffix(UnFqdn(domain))
+	if publicsuffix == UnFqdn(domain) {
+		return true
+	}
+	return false
+}
+
+// ClearFqdnCache clears the cache of fqdn to zone mappings. Primarily used in testing.
+func ClearFqdnCache() {
+	fqdnToZone = map[string]string{}
+}
+
+// ToFqdn converts the name into a fqdn appending a trailing dot.
+func ToFqdn(name string) string {
+	n := len(name)
+	if n == 0 || name[n-1] == '.' {
+		return name
+	}
+	return name + "."
+}
+
+// UnFqdn converts the fqdn into a name removing the trailing dot.
+func UnFqdn(name string) string {
+	n := len(name)
+	if n != 0 && name[n-1] == '.' {
+		return name[:n-1]
+	}
+	return name
+}

vendor/github.com/xenolf/lego/acme/dns_challenge_manual.go

@@ -0,0 +1,53 @@
+package acme
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+const (
+	dnsTemplate = "%s %d IN TXT \"%s\""
+)
+
+// DNSProviderManual is an implementation of the ChallengeProvider interface
+type DNSProviderManual struct{}
+
+// NewDNSProviderManual returns a DNSProviderManual instance.
+func NewDNSProviderManual() (*DNSProviderManual, error) {
+	return &DNSProviderManual{}, nil
+}
+
+// Present prints instructions for manually creating the TXT record
+func (*DNSProviderManual) Present(domain, token, keyAuth string) error {
+	fqdn, value, ttl := DNS01Record(domain, keyAuth)
+	dnsRecord := fmt.Sprintf(dnsTemplate, fqdn, ttl, value)
+
+	authZone, err := FindZoneByFqdn(fqdn, RecursiveNameservers)
+	if err != nil {
+		return err
+	}
+
+	logf("[INFO] acme: Please create the following TXT record in your %s zone:", authZone)
+	logf("[INFO] acme: %s", dnsRecord)
+	logf("[INFO] acme: Press 'Enter' when you are done")
+
+	reader := bufio.NewReader(os.Stdin)
+	_, _ = reader.ReadString('\n')
+	return nil
+}
+
+// CleanUp prints instructions for manually removing the TXT record
+func (*DNSProviderManual) CleanUp(domain, token, keyAuth string) error {
+	fqdn, _, ttl := DNS01Record(domain, keyAuth)
+	dnsRecord := fmt.Sprintf(dnsTemplate, fqdn, ttl, "...")
+
+	authZone, err := FindZoneByFqdn(fqdn, RecursiveNameservers)
+	if err != nil {
+		return err
+	}
+
+	logf("[INFO] acme: You can now remove this TXT record from your %s zone:", authZone)
+	logf("[INFO] acme: %s", dnsRecord)
+	return nil
+}

vendor/github.com/xenolf/lego/acme/error.go

@@ -3,12 +3,14 @@ package acme
 import (
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net/http"
 	"strings"
 )
 
 const (
 	tosAgreementError = "Must agree to subscriber agreement before any further actions"
+	invalidNonceError = "JWS has invalid anti-replay nonce"
 )
 
 // RemoteError is the base type for all errors specific to the ACME protocol.
@@ -29,6 +31,12 @@ type TOSError struct {
 	RemoteError
 }
 
+// NonceError represents the error which is returned if the
+// nonce sent by the client was not accepted by the server.
+type NonceError struct {
+	RemoteError
+}
+
 type domainError struct {
 	Domain string
 	Error  error
@@ -52,10 +60,19 @@ func (c challengeError) Error() string {
 
 func handleHTTPError(resp *http.Response) error {
 	var errorDetail RemoteError
-	decoder := json.NewDecoder(resp.Body)
-	err := decoder.Decode(&errorDetail)
-	if err != nil {
-		return err
+
+	contentType := resp.Header.Get("Content-Type")
+	if contentType == "application/json" || contentType == "application/problem+json" {
+		err := json.NewDecoder(resp.Body).Decode(&errorDetail)
+		if err != nil {
+			return err
+		}
+	} else {
+		detailBytes, err := ioutil.ReadAll(limitReader(resp.Body, maxBodySize))
+		if err != nil {
+			return err
+		}
+		errorDetail.Detail = string(detailBytes)
 	}
 
 	errorDetail.StatusCode = resp.StatusCode
@@ -65,6 +82,10 @@ func handleHTTPError(resp *http.Response) error {
 		return TOSError{errorDetail}
 	}
 
+	if errorDetail.StatusCode == http.StatusBadRequest && strings.HasPrefix(errorDetail.Detail, invalidNonceError) {
+		return NonceError{errorDetail}
+	}
+
 	return errorDetail
 }
 

vendor/github.com/xenolf/lego/acme/http.go

@@ -8,11 +8,15 @@ import (
 	"net/http"
 	"runtime"
 	"strings"
+	"time"
 )
 
-// UserAgent, if non-empty, will be tacked onto the User-Agent string in requests.
+// UserAgent (if non-empty) will be tacked onto the User-Agent string in requests.
 var UserAgent string
 
+// HTTPClient is an HTTP client with a reasonable timeout value.
+var HTTPClient = http.Client{Timeout: 10 * time.Second}
+
 const (
 	// defaultGoUserAgent is the Go HTTP package user agent string. Too
 	// bad it isn't exported. If it changes, we should update it here, too.
@@ -27,16 +31,16 @@ const (
 func httpHead(url string) (resp *http.Response, err error) {
 	req, err := http.NewRequest("HEAD", url, nil)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("failed to head %q: %v", url, err)
 	}
 
 	req.Header.Set("User-Agent", userAgent())
 
-	client := http.Client{}
-	resp, err = client.Do(req)
-	if resp.Body != nil {
-		resp.Body.Close()
+	resp, err = HTTPClient.Do(req)
+	if err != nil {
+		return resp, fmt.Errorf("failed to do head %q: %v", url, err)
 	}
+	resp.Body.Close()
 	return resp, err
 }
 
@@ -45,13 +49,12 @@ func httpHead(url string) (resp *http.Response, err error) {
 func httpPost(url string, bodyType string, body io.Reader) (resp *http.Response, err error) {
 	req, err := http.NewRequest("POST", url, body)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("failed to post %q: %v", url, err)
 	}
 	req.Header.Set("Content-Type", bodyType)
 	req.Header.Set("User-Agent", userAgent())
 
-	client := http.Client{}
-	return client.Do(req)
+	return HTTPClient.Do(req)
 }
 
 // httpGet performs a GET request with a proper User-Agent string.
@@ -59,12 +62,11 @@ func httpPost(url string, bodyType string, body io.Reader) (resp *http.Response,
 func httpGet(url string) (resp *http.Response, err error) {
 	req, err := http.NewRequest("GET", url, nil)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("failed to get %q: %v", url, err)
 	}
 	req.Header.Set("User-Agent", userAgent())
 
-	client := http.Client{}
-	return client.Do(req)
+	return HTTPClient.Do(req)
 }
 
 // getJSON performs an HTTP GET request and parses the response body
@@ -72,7 +74,7 @@ func httpGet(url string) (resp *http.Response, err error) {
 func getJSON(uri string, respBody interface{}) (http.Header, error) {
 	resp, err := httpGet(uri)
 	if err != nil {
-		return nil, fmt.Errorf("failed to get %q: %v", uri, err)
+		return nil, fmt.Errorf("failed to get json %q: %v", uri, err)
 	}
 	defer resp.Body.Close()
 
@@ -95,10 +97,41 @@ func postJSON(j *jws, uri string, reqBody, respBody interface{}) (http.Header, e
 	if err != nil {
 		return nil, fmt.Errorf("Failed to post JWS message. -> %v", err)
 	}
+
 	defer resp.Body.Close()
 
 	if resp.StatusCode >= http.StatusBadRequest {
-		return resp.Header, handleHTTPError(resp)
+
+		err := handleHTTPError(resp)
+
+		switch err.(type) {
+
+		case NonceError:
+
+			// Retry once if the nonce was invalidated
+
+			retryResp, err := j.post(uri, jsonBytes)
+			if err != nil {
+				return nil, fmt.Errorf("Failed to post JWS message. -> %v", err)
+			}
+
+			defer retryResp.Body.Close()
+
+			if retryResp.StatusCode >= http.StatusBadRequest {
+				return retryResp.Header, handleHTTPError(retryResp)
+			}
+
+			if respBody == nil {
+				return retryResp.Header, nil
+			}
+
+			return retryResp.Header, json.NewDecoder(retryResp.Body).Decode(respBody)
+
+		default:
+			return resp.Header, err
+
+		}
+
 	}
 
 	if respBody == nil {

vendor/github.com/xenolf/lego/acme/http_challenge.go

@@ -2,73 +2,40 @@ package acme
 
 import (
 	"fmt"
-	"net"
-	"net/http"
-	"strings"
+	"log"
 )
 
 type httpChallenge struct {
 	jws      *jws
 	validate validateFunc
-	iface    string
-	port     string
-	done     chan bool
+	provider ChallengeProvider
+}
+
+// HTTP01ChallengePath returns the URL path for the `http-01` challenge
+func HTTP01ChallengePath(token string) string {
+	return "/.well-known/acme-challenge/" + token
 }
 
 func (s *httpChallenge) Solve(chlng challenge, domain string) error {
 
 	logf("[INFO][%s] acme: Trying to solve HTTP-01", domain)
 
-	s.done = make(chan bool)
-
 	// Generate the Key Authorization for the challenge
-	keyAuth, err := getKeyAuthorization(chlng.Token, &s.jws.privKey.PublicKey)
+	keyAuth, err := getKeyAuthorization(chlng.Token, s.jws.privKey)
 	if err != nil {
 		return err
 	}
 
-	// Allow for CLI port override
-	port := "80"
-	if s.port != "" {
-		port = s.port
-	}
-
-	iface := ""
-	if s.iface != "" {
-		iface = s.iface
-	}
-
-	listener, err := net.Listen("tcp", net.JoinHostPort(iface, port))
+	err = s.provider.Present(domain, chlng.Token, keyAuth)
 	if err != nil {
-		return fmt.Errorf("Could not start HTTP server for challenge -> %v", err)
+		return fmt.Errorf("[%s] error presenting token: %v", domain, err)
 	}
-
-	path := "/.well-known/acme-challenge/" + chlng.Token
-
-	go s.serve(listener, path, keyAuth, domain)
-
-	err = s.validate(s.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
-	listener.Close()
-	<-s.done
-
-	return err
-}
-
-func (s *httpChallenge) serve(listener net.Listener, path, keyAuth, domain string) {
-	// The handler validates the HOST header and request type.
-	// For validation it then writes the token the server returned with the challenge
-	mux := http.NewServeMux()
-	mux.HandleFunc(path, func(w http.ResponseWriter, r *http.Request) {
-		if strings.HasPrefix(r.Host, domain) && r.Method == "GET" {
-			w.Header().Add("Content-Type", "text/plain")
-			w.Write([]byte(keyAuth))
-			logf("[INFO][%s] Served key authentication", domain)
-		} else {
-			logf("[INFO] Received request for domain %s with method %s", r.Host, r.Method)
-			w.Write([]byte("TEST"))
+	defer func() {
+		err := s.provider.CleanUp(domain, chlng.Token, keyAuth)
+		if err != nil {
+			log.Printf("[%s] error cleaning up: %v", domain, err)
 		}
-	})
+	}()
 
-	http.Serve(listener, mux)
-	s.done <- true
+	return s.validate(s.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
 }

vendor/github.com/xenolf/lego/acme/http_challenge_server.go

@@ -0,0 +1,79 @@
+package acme
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"strings"
+)
+
+// HTTPProviderServer implements ChallengeProvider for `http-01` challenge
+// It may be instantiated without using the NewHTTPProviderServer function if
+// you want only to use the default values.
+type HTTPProviderServer struct {
+	iface    string
+	port     string
+	done     chan bool
+	listener net.Listener
+}
+
+// NewHTTPProviderServer creates a new HTTPProviderServer on the selected interface and port.
+// Setting iface and / or port to an empty string will make the server fall back to
+// the "any" interface and port 80 respectively.
+func NewHTTPProviderServer(iface, port string) *HTTPProviderServer {
+	return &HTTPProviderServer{iface: iface, port: port}
+}
+
+// Present starts a web server and makes the token available at `HTTP01ChallengePath(token)` for web requests.
+func (s *HTTPProviderServer) Present(domain, token, keyAuth string) error {
+	if s.port == "" {
+		s.port = "80"
+	}
+
+	var err error
+	s.listener, err = net.Listen("tcp", net.JoinHostPort(s.iface, s.port))
+	if err != nil {
+		return fmt.Errorf("Could not start HTTP server for challenge -> %v", err)
+	}
+
+	s.done = make(chan bool)
+	go s.serve(domain, token, keyAuth)
+	return nil
+}
+
+// CleanUp closes the HTTP server and removes the token from `HTTP01ChallengePath(token)`
+func (s *HTTPProviderServer) CleanUp(domain, token, keyAuth string) error {
+	if s.listener == nil {
+		return nil
+	}
+	s.listener.Close()
+	<-s.done
+	return nil
+}
+
+func (s *HTTPProviderServer) serve(domain, token, keyAuth string) {
+	path := HTTP01ChallengePath(token)
+
+	// The handler validates the HOST header and request type.
+	// For validation it then writes the token the server returned with the challenge
+	mux := http.NewServeMux()
+	mux.HandleFunc(path, func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasPrefix(r.Host, domain) && r.Method == "GET" {
+			w.Header().Add("Content-Type", "text/plain")
+			w.Write([]byte(keyAuth))
+			logf("[INFO][%s] Served key authentication", domain)
+		} else {
+			logf("[WARN] Received request for domain %s with method %s but the domain did not match any challenge. Please ensure your are passing the HOST header properly.", r.Host, r.Method)
+			w.Write([]byte("TEST"))
+		}
+	})
+
+	httpServer := &http.Server{
+		Handler: mux,
+	}
+	// Once httpServer is shut down we don't want any lingering
+	// connections, so disable KeepAlives.
+	httpServer.SetKeepAlivesEnabled(false)
+	httpServer.Serve(s.listener)
+	s.done <- true
+}

vendor/github.com/xenolf/lego/acme/http_challenge_test.go

@@ -1,56 +0,0 @@
-package acme
-
-import (
-	"crypto/rsa"
-	"io/ioutil"
-	"strings"
-	"testing"
-)
-
-func TestHTTPChallenge(t *testing.T) {
-	privKey, _ := generatePrivateKey(rsakey, 512)
-	j := &jws{privKey: privKey.(*rsa.PrivateKey)}
-	clientChallenge := challenge{Type: "http-01", Token: "http1"}
-	mockValidate := func(_ *jws, _, _ string, chlng challenge) error {
-		uri := "http://localhost:23457/.well-known/acme-challenge/" + chlng.Token
-		resp, err := httpGet(uri)
-		if err != nil {
-			return err
-		}
-		defer resp.Body.Close()
-
-		if want := "text/plain"; resp.Header.Get("Content-Type") != want {
-			t.Errorf("Get(%q) Content-Type: got %q, want %q", uri, resp.Header.Get("Content-Type"), want)
-		}
-
-		body, err := ioutil.ReadAll(resp.Body)
-		if err != nil {
-			return err
-		}
-		bodyStr := string(body)
-
-		if bodyStr != chlng.KeyAuthorization {
-			t.Errorf("Get(%q) Body: got %q, want %q", uri, bodyStr, chlng.KeyAuthorization)
-		}
-
-		return nil
-	}
-	solver := &httpChallenge{jws: j, validate: mockValidate, port: "23457"}
-
-	if err := solver.Solve(clientChallenge, "localhost:23457"); err != nil {
-		t.Errorf("Solve error: got %v, want nil", err)
-	}
-}
-
-func TestHTTPChallengeInvalidPort(t *testing.T) {
-	privKey, _ := generatePrivateKey(rsakey, 128)
-	j := &jws{privKey: privKey.(*rsa.PrivateKey)}
-	clientChallenge := challenge{Type: "http-01", Token: "http2"}
-	solver := &httpChallenge{jws: j, validate: stubValidate, port: "123456"}
-
-	if err := solver.Solve(clientChallenge, "localhost:123456"); err == nil {
-		t.Errorf("Solve error: got %v, want error", err)
-	} else if want := "invalid port 123456"; !strings.HasSuffix(err.Error(), want) {
-		t.Errorf("Solve error: got %q, want suffix %q", err.Error(), want)
-	}
-}

vendor/github.com/xenolf/lego/acme/http_test.go

@@ -1,100 +0,0 @@
-package acme
-
-import (
-	"net/http"
-	"net/http/httptest"
-	"strings"
-	"testing"
-)
-
-func TestHTTPHeadUserAgent(t *testing.T) {
-	var ua, method string
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		ua = r.Header.Get("User-Agent")
-		method = r.Method
-	}))
-	defer ts.Close()
-
-	_, err := httpHead(ts.URL)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if method != "HEAD" {
-		t.Errorf("Expected method to be HEAD, got %s", method)
-	}
-	if !strings.Contains(ua, ourUserAgent) {
-		t.Errorf("Expected User-Agent to contain '%s', got: '%s'", ourUserAgent, ua)
-	}
-}
-
-func TestHTTPGetUserAgent(t *testing.T) {
-	var ua, method string
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		ua = r.Header.Get("User-Agent")
-		method = r.Method
-	}))
-	defer ts.Close()
-
-	res, err := httpGet(ts.URL)
-	if err != nil {
-		t.Fatal(err)
-	}
-	res.Body.Close()
-
-	if method != "GET" {
-		t.Errorf("Expected method to be GET, got %s", method)
-	}
-	if !strings.Contains(ua, ourUserAgent) {
-		t.Errorf("Expected User-Agent to contain '%s', got: '%s'", ourUserAgent, ua)
-	}
-}
-
-func TestHTTPPostUserAgent(t *testing.T) {
-	var ua, method string
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		ua = r.Header.Get("User-Agent")
-		method = r.Method
-	}))
-	defer ts.Close()
-
-	res, err := httpPost(ts.URL, "text/plain", strings.NewReader("falalalala"))
-	if err != nil {
-		t.Fatal(err)
-	}
-	res.Body.Close()
-
-	if method != "POST" {
-		t.Errorf("Expected method to be POST, got %s", method)
-	}
-	if !strings.Contains(ua, ourUserAgent) {
-		t.Errorf("Expected User-Agent to contain '%s', got: '%s'", ourUserAgent, ua)
-	}
-}
-
-func TestUserAgent(t *testing.T) {
-	ua := userAgent()
-
-	if !strings.Contains(ua, defaultGoUserAgent) {
-		t.Errorf("Expected UA to contain %s, got '%s'", defaultGoUserAgent, ua)
-	}
-	if !strings.Contains(ua, ourUserAgent) {
-		t.Errorf("Expected UA to contain %s, got '%s'", ourUserAgent, ua)
-	}
-	if strings.HasSuffix(ua, " ") {
-		t.Errorf("UA should not have trailing spaces; got '%s'", ua)
-	}
-
-	// customize the UA by appending a value
-	UserAgent = "MyApp/1.2.3"
-	ua = userAgent()
-	if !strings.Contains(ua, defaultGoUserAgent) {
-		t.Errorf("Expected UA to contain %s, got '%s'", defaultGoUserAgent, ua)
-	}
-	if !strings.Contains(ua, ourUserAgent) {
-		t.Errorf("Expected UA to contain %s, got '%s'", ourUserAgent, ua)
-	}
-	if !strings.Contains(ua, UserAgent) {
-		t.Errorf("Expected custom UA to contain %s, got '%s'", UserAgent, ua)
-	}
-}

vendor/github.com/xenolf/lego/acme/jws.go

@@ -2,18 +2,21 @@ package acme
 
 import (
 	"bytes"
+	"crypto"
 	"crypto/ecdsa"
+	"crypto/elliptic"
 	"crypto/rsa"
 	"fmt"
 	"net/http"
+	"sync"
 
-	"github.com/square/go-jose"
+	"gopkg.in/square/go-jose.v1"
 )
 
 type jws struct {
 	directoryURL string
-	privKey      *rsa.PrivateKey
-	nonces       []string
+	privKey      crypto.PrivateKey
+	nonces       nonceManager
 }
 
 func keyAsJWK(key interface{}) *jose.JsonWebKey {
@@ -28,66 +31,101 @@ func keyAsJWK(key interface{}) *jose.JsonWebKey {
 	}
 }
 
-// Posts a JWS signed message to the specified URL
+// Posts a JWS signed message to the specified URL.
+// It does NOT close the response body, so the caller must
+// do that if no error was returned.
 func (j *jws) post(url string, content []byte) (*http.Response, error) {
 	signedContent, err := j.signContent(content)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("Failed to sign content -> %s", err.Error())
 	}
 
 	resp, err := httpPost(url, "application/jose+json", bytes.NewBuffer([]byte(signedContent.FullSerialize())))
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("Failed to HTTP POST to %s -> %s", url, err.Error())
 	}
 
-	j.getNonceFromResponse(resp)
+	nonce, nonceErr := getNonceFromResponse(resp)
+	if nonceErr == nil {
+		j.nonces.Push(nonce)
+	}
 
-	return resp, err
+	return resp, nil
 }
 
 func (j *jws) signContent(content []byte) (*jose.JsonWebSignature, error) {
-	// TODO: support other algorithms - RS512
-	signer, err := jose.NewSigner(jose.RS256, j.privKey)
+
+	var alg jose.SignatureAlgorithm
+	switch k := j.privKey.(type) {
+	case *rsa.PrivateKey:
+		alg = jose.RS256
+	case *ecdsa.PrivateKey:
+		if k.Curve == elliptic.P256() {
+			alg = jose.ES256
+		} else if k.Curve == elliptic.P384() {
+			alg = jose.ES384
+		}
+	}
+
+	signer, err := jose.NewSigner(alg, j.privKey)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("Failed to create jose signer -> %s", err.Error())
 	}
 	signer.SetNonceSource(j)
 
 	signed, err := signer.Sign(content)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("Failed to sign content -> %s", err.Error())
 	}
 	return signed, nil
 }
 
-func (j *jws) getNonceFromResponse(resp *http.Response) error {
+func (j *jws) Nonce() (string, error) {
+	if nonce, ok := j.nonces.Pop(); ok {
+		return nonce, nil
+	}
+
+	return getNonce(j.directoryURL)
+}
+
+type nonceManager struct {
+	nonces []string
+	sync.Mutex
+}
+
+func (n *nonceManager) Pop() (string, bool) {
+	n.Lock()
+	defer n.Unlock()
+
+	if len(n.nonces) == 0 {
+		return "", false
+	}
+
+	nonce := n.nonces[len(n.nonces)-1]
+	n.nonces = n.nonces[:len(n.nonces)-1]
+	return nonce, true
+}
+
+func (n *nonceManager) Push(nonce string) {
+	n.Lock()
+	defer n.Unlock()
+	n.nonces = append(n.nonces, nonce)
+}
+
+func getNonce(url string) (string, error) {
+	resp, err := httpHead(url)
+	if err != nil {
+		return "", fmt.Errorf("Failed to get nonce from HTTP HEAD -> %s", err.Error())
+	}
+
+	return getNonceFromResponse(resp)
+}
+
+func getNonceFromResponse(resp *http.Response) (string, error) {
 	nonce := resp.Header.Get("Replay-Nonce")
 	if nonce == "" {
-		return fmt.Errorf("Server did not respond with a proper nonce header.")
+		return "", fmt.Errorf("Server did not respond with a proper nonce header.")
 	}
 
-	j.nonces = append(j.nonces, nonce)
-	return nil
-}
-
-func (j *jws) getNonce() error {
-	resp, err := httpHead(j.directoryURL)
-	if err != nil {
-		return err
-	}
-
-	return j.getNonceFromResponse(resp)
-}
-
-func (j *jws) Nonce() (string, error) {
-	nonce := ""
-	if len(j.nonces) == 0 {
-		err := j.getNonce()
-		if err != nil {
-			return nonce, err
-		}
-	}
-
-	nonce, j.nonces = j.nonces[len(j.nonces)-1], j.nonces[:len(j.nonces)-1]
 	return nonce, nil
 }

vendor/github.com/xenolf/lego/acme/messages.go

@@ -3,7 +3,7 @@ package acme
 import (
 	"time"
 
-	"github.com/square/go-jose"
+	"gopkg.in/square/go-jose.v1"
 )
 
 type directory struct {
@@ -13,33 +13,22 @@ type directory struct {
 	RevokeCertURL string `json:"revoke-cert"`
 }
 
-type recoveryKeyMessage struct {
-	Length int             `json:"length,omitempty"`
-	Client jose.JsonWebKey `json:"client,omitempty"`
-	Server jose.JsonWebKey `json:"client,omitempty"`
-}
-
 type registrationMessage struct {
 	Resource string   `json:"resource"`
 	Contact  []string `json:"contact"`
-	//	RecoveryKey recoveryKeyMessage `json:"recoveryKey,omitempty"`
+	Delete   bool     `json:"delete,omitempty"`
 }
 
 // Registration is returned by the ACME server after the registration
 // The client implementation should save this registration somewhere.
 type Registration struct {
-	Resource string `json:"resource,omitempty"`
-	ID       int    `json:"id"`
-	Key      struct {
-		Kty string `json:"kty"`
-		N   string `json:"n"`
-		E   string `json:"e"`
-	} `json:"key"`
-	Contact        []string `json:"contact"`
-	Agreement      string   `json:"agreement,omitempty"`
-	Authorizations string   `json:"authorizations,omitempty"`
-	Certificates   string   `json:"certificates,omitempty"`
-	//	RecoveryKey    recoveryKeyMessage `json:"recoveryKey,omitempty"`
+	Resource       string          `json:"resource,omitempty"`
+	ID             int             `json:"id"`
+	Key            jose.JsonWebKey `json:"key"`
+	Contact        []string        `json:"contact"`
+	Agreement      string          `json:"agreement,omitempty"`
+	Authorizations string          `json:"authorizations,omitempty"`
+	Certificates   string          `json:"certificates,omitempty"`
 }
 
 // RegistrationResource represents all important informations about a registration
@@ -82,7 +71,7 @@ type validationRecord struct {
 
 type challenge struct {
 	Resource          string             `json:"resource,omitempty"`
-	Type              string             `json:"type,omitempty"`
+	Type              Challenge          `json:"type,omitempty"`
 	Status            string             `json:"status,omitempty"`
 	URI               string             `json:"uri,omitempty"`
 	Token             string             `json:"token,omitempty"`
@@ -105,14 +94,17 @@ type revokeCertMessage struct {
 }
 
 // CertificateResource represents a CA issued certificate.
-// PrivateKey and Certificate are both already PEM encoded
-// and can be directly written to disk. Certificate may
-// be a certificate bundle, depending on the options supplied
-// to create it.
+// PrivateKey, Certificate and IssuerCertificate are all
+// already PEM encoded and can be directly written to disk.
+// Certificate may be a certificate bundle, depending on the
+// options supplied to create it.
 type CertificateResource struct {
-	Domain        string `json:"domain"`
-	CertURL       string `json:"certUrl"`
-	CertStableURL string `json:"certStableUrl"`
-	PrivateKey    []byte `json:"-"`
-	Certificate   []byte `json:"-"`
+	Domain            string `json:"domain"`
+	CertURL           string `json:"certUrl"`
+	CertStableURL     string `json:"certStableUrl"`
+	AccountRef        string `json:"accountRef,omitempty"`
+	PrivateKey        []byte `json:"-"`
+	Certificate       []byte `json:"-"`
+	IssuerCertificate []byte `json:"-"`
+	CSR               []byte `json:"-"`
 }

vendor/github.com/xenolf/lego/acme/provider.go

@@ -0,0 +1,28 @@
+package acme
+
+import "time"
+
+// ChallengeProvider enables implementing a custom challenge
+// provider. Present presents the solution to a challenge available to
+// be solved. CleanUp will be called by the challenge if Present ends
+// in a non-error state.
+type ChallengeProvider interface {
+	Present(domain, token, keyAuth string) error
+	CleanUp(domain, token, keyAuth string) error
+}
+
+// ChallengeProviderTimeout allows for implementing a
+// ChallengeProvider where an unusually long timeout is required when
+// waiting for an ACME challenge to be satisfied, such as when
+// checking for DNS record progagation. If an implementor of a
+// ChallengeProvider provides a Timeout method, then the return values
+// of the Timeout method will be used when appropriate by the acme
+// package. The interval value is the time between checks.
+//
+// The default values used for timeout and interval are 60 seconds and
+// 2 seconds respectively. These are used when no Timeout method is
+// defined for the ChallengeProvider.
+type ChallengeProviderTimeout interface {
+	ChallengeProvider
+	Timeout() (timeout, interval time.Duration)
+}

vendor/github.com/xenolf/lego/acme/tls_sni_challenge.go

@@ -6,15 +6,13 @@ import (
 	"crypto/tls"
 	"encoding/hex"
 	"fmt"
-	"net"
-	"net/http"
+	"log"
 )
 
 type tlsSNIChallenge struct {
 	jws      *jws
 	validate validateFunc
-	iface    string
-	port     string
+	provider ChallengeProvider
 }
 
 func (t *tlsSNIChallenge) Solve(chlng challenge, domain string) error {
@@ -24,64 +22,46 @@ func (t *tlsSNIChallenge) Solve(chlng challenge, domain string) error {
 	logf("[INFO][%s] acme: Trying to solve TLS-SNI-01", domain)
 
 	// Generate the Key Authorization for the challenge
-	keyAuth, err := getKeyAuthorization(chlng.Token, &t.jws.privKey.PublicKey)
+	keyAuth, err := getKeyAuthorization(chlng.Token, t.jws.privKey)
 	if err != nil {
 		return err
 	}
 
-	cert, err := t.generateCertificate(keyAuth)
+	err = t.provider.Present(domain, chlng.Token, keyAuth)
 	if err != nil {
-		return err
+		return fmt.Errorf("[%s] error presenting token: %v", domain, err)
 	}
-
-	// Allow for CLI port override
-	port := "443"
-	if t.port != "" {
-		port = t.port
-	}
-
-	iface := ""
-	if t.iface != "" {
-		iface = t.iface
-	}
-
-	tlsConf := new(tls.Config)
-	tlsConf.Certificates = []tls.Certificate{cert}
-
-	listener, err := tls.Listen("tcp", net.JoinHostPort(iface, port), tlsConf)
-	if err != nil {
-		return fmt.Errorf("Could not start HTTPS server for challenge -> %v", err)
-	}
-	defer listener.Close()
-
-	go http.Serve(listener, nil)
-
+	defer func() {
+		err := t.provider.CleanUp(domain, chlng.Token, keyAuth)
+		if err != nil {
+			log.Printf("[%s] error cleaning up: %v", domain, err)
+		}
+	}()
 	return t.validate(t.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
 }
 
-func (t *tlsSNIChallenge) generateCertificate(keyAuth string) (tls.Certificate, error) {
-
-	zBytes := sha256.Sum256([]byte(keyAuth))
-	z := hex.EncodeToString(zBytes[:sha256.Size])
-
+// TLSSNI01ChallengeCert returns a certificate and target domain for the `tls-sni-01` challenge
+func TLSSNI01ChallengeCert(keyAuth string) (tls.Certificate, string, error) {
 	// generate a new RSA key for the certificates
-	tempPrivKey, err := generatePrivateKey(rsakey, 2048)
+	tempPrivKey, err := generatePrivateKey(RSA2048)
 	if err != nil {
-		return tls.Certificate{}, err
+		return tls.Certificate{}, "", err
 	}
 	rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
 	rsaPrivPEM := pemEncode(rsaPrivKey)
 
+	zBytes := sha256.Sum256([]byte(keyAuth))
+	z := hex.EncodeToString(zBytes[:sha256.Size])
 	domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
 	tempCertPEM, err := generatePemCert(rsaPrivKey, domain)
 	if err != nil {
-		return tls.Certificate{}, err
+		return tls.Certificate{}, "", err
 	}
 
 	certificate, err := tls.X509KeyPair(tempCertPEM, rsaPrivPEM)
 	if err != nil {
-		return tls.Certificate{}, err
+		return tls.Certificate{}, "", err
 	}
 
-	return certificate, nil
+	return certificate, domain, nil
 }

vendor/github.com/xenolf/lego/acme/tls_sni_challenge_server.go

@@ -0,0 +1,62 @@
+package acme
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/http"
+)
+
+// TLSProviderServer implements ChallengeProvider for `TLS-SNI-01` challenge
+// It may be instantiated without using the NewTLSProviderServer function if
+// you want only to use the default values.
+type TLSProviderServer struct {
+	iface    string
+	port     string
+	done     chan bool
+	listener net.Listener
+}
+
+// NewTLSProviderServer creates a new TLSProviderServer on the selected interface and port.
+// Setting iface and / or port to an empty string will make the server fall back to
+// the "any" interface and port 443 respectively.
+func NewTLSProviderServer(iface, port string) *TLSProviderServer {
+	return &TLSProviderServer{iface: iface, port: port}
+}
+
+// Present makes the keyAuth available as a cert
+func (s *TLSProviderServer) Present(domain, token, keyAuth string) error {
+	if s.port == "" {
+		s.port = "443"
+	}
+
+	cert, _, err := TLSSNI01ChallengeCert(keyAuth)
+	if err != nil {
+		return err
+	}
+
+	tlsConf := new(tls.Config)
+	tlsConf.Certificates = []tls.Certificate{cert}
+
+	s.listener, err = tls.Listen("tcp", net.JoinHostPort(s.iface, s.port), tlsConf)
+	if err != nil {
+		return fmt.Errorf("Could not start HTTPS server for challenge -> %v", err)
+	}
+
+	s.done = make(chan bool)
+	go func() {
+		http.Serve(s.listener, nil)
+		s.done <- true
+	}()
+	return nil
+}
+
+// CleanUp closes the HTTP server.
+func (s *TLSProviderServer) CleanUp(domain, token, keyAuth string) error {
+	if s.listener == nil {
+		return nil
+	}
+	s.listener.Close()
+	<-s.done
+	return nil
+}

vendor/github.com/xenolf/lego/acme/tls_sni_challenge_test.go

@@ -1,64 +0,0 @@
-package acme
-
-import (
-	"crypto/rsa"
-	"crypto/sha256"
-	"crypto/tls"
-	"encoding/hex"
-	"fmt"
-	"strings"
-	"testing"
-)
-
-func TestTLSSNIChallenge(t *testing.T) {
-	privKey, _ := generatePrivateKey(rsakey, 512)
-	j := &jws{privKey: privKey.(*rsa.PrivateKey)}
-	clientChallenge := challenge{Type: "tls-sni-01", Token: "tlssni1"}
-	mockValidate := func(_ *jws, _, _ string, chlng challenge) error {
-		conn, err := tls.Dial("tcp", "localhost:23457", &tls.Config{
-			InsecureSkipVerify: true,
-		})
-		if err != nil {
-			t.Errorf("Expected to connect to challenge server without an error. %s", err.Error())
-		}
-
-		// Expect the server to only return one certificate
-		connState := conn.ConnectionState()
-		if count := len(connState.PeerCertificates); count != 1 {
-			t.Errorf("Expected the challenge server to return exactly one certificate but got %d", count)
-		}
-
-		remoteCert := connState.PeerCertificates[0]
-		if count := len(remoteCert.DNSNames); count != 1 {
-			t.Errorf("Expected the challenge certificate to have exactly one DNSNames entry but had %d", count)
-		}
-
-		zBytes := sha256.Sum256([]byte(chlng.KeyAuthorization))
-		z := hex.EncodeToString(zBytes[:sha256.Size])
-		domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
-
-		if remoteCert.DNSNames[0] != domain {
-			t.Errorf("Expected the challenge certificate DNSName to match %s but was %s", domain, remoteCert.DNSNames[0])
-		}
-
-		return nil
-	}
-	solver := &tlsSNIChallenge{jws: j, validate: mockValidate, port: "23457"}
-
-	if err := solver.Solve(clientChallenge, "localhost:23457"); err != nil {
-		t.Errorf("Solve error: got %v, want nil", err)
-	}
-}
-
-func TestTLSSNIChallengeInvalidPort(t *testing.T) {
-	privKey, _ := generatePrivateKey(rsakey, 128)
-	j := &jws{privKey: privKey.(*rsa.PrivateKey)}
-	clientChallenge := challenge{Type: "tls-sni-01", Token: "tlssni2"}
-	solver := &tlsSNIChallenge{jws: j, validate: stubValidate, port: "123456"}
-
-	if err := solver.Solve(clientChallenge, "localhost:123456"); err == nil {
-		t.Errorf("Solve error: got %v, want error", err)
-	} else if want := "invalid port 123456"; !strings.HasSuffix(err.Error(), want) {
-		t.Errorf("Solve error: got %q, want suffix %q", err.Error(), want)
-	}
-}

vendor/github.com/xenolf/lego/acme/utils.go

@@ -0,0 +1,29 @@
+package acme
+
+import (
+	"fmt"
+	"time"
+)
+
+// WaitFor polls the given function 'f', once every 'interval', up to 'timeout'.
+func WaitFor(timeout, interval time.Duration, f func() (bool, error)) error {
+	var lastErr string
+	timeup := time.After(timeout)
+	for {
+		select {
+		case <-timeup:
+			return fmt.Errorf("Time limit exceeded. Last error: %s", lastErr)
+		default:
+		}
+
+		stop, err := f()
+		if stop {
+			return nil
+		}
+		if err != nil {
+			lastErr = err.Error()
+		}
+
+		time.Sleep(interval)
+	}
+}