diff --git a/Gopkg.lock b/Gopkg.lock
index f6718f283..598f11735 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -316,6 +316,12 @@
   revision = "48702e0da86bd25e76cfef347e2adeb434a0d0a6"
   version = "v14"
 
+[[projects]]
+  branch = "master"
+  name = "github.com/cpu/goacmedns"
+  packages = ["."]
+  revision = "565ecf2a84df654865cc102705ac160a3b04fc01"
+
 [[projects]]
   name = "github.com/davecgh/go-spew"
   packages = ["spew"]
@@ -1299,6 +1305,7 @@
     "log",
     "platform/config/env",
     "providers/dns",
+    "providers/dns/acmedns",
     "providers/dns/auroradns",
     "providers/dns/azure",
     "providers/dns/bluecat",
@@ -1334,7 +1341,7 @@
     "providers/dns/vegadns",
     "providers/dns/vultr"
   ]
-  revision = "e0d512138c43e3f056a41cd7a5beff662ec130d3"
+  revision = "8b6701514cc0a6285a327908f3f9ce05bcacbffd"
 
 [[projects]]
   branch = "master"
diff --git a/vendor/github.com/cpu/goacmedns/LICENSE b/vendor/github.com/cpu/goacmedns/LICENSE
new file mode 100644
index 000000000..3215897de
--- /dev/null
+++ b/vendor/github.com/cpu/goacmedns/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Daniel McCarney
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/github.com/cpu/goacmedns/account.go b/vendor/github.com/cpu/goacmedns/account.go
new file mode 100644
index 000000000..9a1d9c81a
--- /dev/null
+++ b/vendor/github.com/cpu/goacmedns/account.go
@@ -0,0 +1,11 @@
+package goacmedns
+
+// Account is a struct that holds the registration response from an ACME-DNS
+// server. It represents an API username/key that can be used to update TXT
+// records for the account's subdomain.
+type Account struct {
+	FullDomain string
+	SubDomain  string
+	Username   string
+	Password   string
+}
diff --git a/vendor/github.com/cpu/goacmedns/client.go b/vendor/github.com/cpu/goacmedns/client.go
new file mode 100644
index 000000000..8be70306e
--- /dev/null
+++ b/vendor/github.com/cpu/goacmedns/client.go
@@ -0,0 +1,191 @@
+package goacmedns
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"runtime"
+	"time"
+)
+
+const (
+	// ua is a custom user-agent identifier
+	ua = "goacmedns"
+)
+
+// userAgent returns a string that can be used as a HTTP request `User-Agent`
+// header. It includes the `ua` string alongside the OS and architecture of the
+// system.
+func userAgent() string {
+	return fmt.Sprintf("%s (%s; %s)", ua, runtime.GOOS, runtime.GOARCH)
+}
+
+var (
+	// defaultTimeout is used for the httpClient Timeout settings
+	defaultTimeout = 30 * time.Second
+	// httpClient is a `http.Client` that is customized with the `defaultTimeout`
+	httpClient = http.Client{
+		Transport: &http.Transport{
+			Dial: (&net.Dialer{
+				Timeout:   defaultTimeout,
+				KeepAlive: defaultTimeout,
+			}).Dial,
+			TLSHandshakeTimeout:   defaultTimeout,
+			ResponseHeaderTimeout: defaultTimeout,
+			ExpectContinueTimeout: 1 * time.Second,
+		},
+	}
+)
+
+// postAPI makes an HTTP POST request to the given URL, sending the given body
+// and attaching the requested custom headers to the request. If there is no
+// error the HTTP response body and HTTP response object are returned, otherwise
+// an error is returned.. All POST requests include a `User-Agent` header
+// populated with the `userAgent` function and a `Content-Type` header of
+// `application/json`.
+func postAPI(url string, body []byte, headers map[string]string) ([]byte, *http.Response, error) {
+	req, err := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(body))
+	if err != nil {
+		fmt.Printf("Failed to make req: %s\n", err.Error())
+		return nil, nil, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", userAgent())
+	for h, v := range headers {
+		req.Header.Set(h, v)
+	}
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		fmt.Printf("Failed to do req: %s\n", err.Error())
+		return nil, resp, err
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	respBody, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		fmt.Printf("Failed to read body: %s\n", err.Error())
+		return nil, resp, err
+	}
+	return respBody, resp, nil
+}
+
+// ClientError represents an error from the ACME-DNS server. It holds
+// a `Message` describing the operation the client was doing, a `HTTPStatus`
+// code returned by the server, and the `Body` of the HTTP Response from the
+// server.
+type ClientError struct {
+	// Message is a string describing the client operation that failed
+	Message string
+	// HTTPStatus is the HTTP status code the ACME DNS server returned
+	HTTPStatus int
+	// Body is the response body the ACME DNS server returned
+	Body []byte
+}
+
+// Error collects all of the ClientError fields into a single string
+func (e ClientError) Error() string {
+	return fmt.Sprintf("%s : status code %d response: %s",
+		e.Message, e.HTTPStatus, string(e.Body))
+}
+
+// newClientError creates a ClientError instance populated with the given
+// arguments
+func newClientError(msg string, respCode int, respBody []byte) ClientError {
+	return ClientError{
+		Message:    msg,
+		HTTPStatus: respCode,
+		Body:       respBody,
+	}
+}
+
+// Client is a struct that can be used to interact with an ACME DNS server to
+// register accounts and update TXT records.
+type Client struct {
+	// baseURL is the address of the ACME DNS server
+	baseURL string
+}
+
+// NewClient returns a Client configured to interact with the ACME DNS server at
+// the given URL.
+func NewClient(url string) Client {
+	return Client{
+		baseURL: url,
+	}
+}
+
+// RegisterAccount creates an Account with the ACME DNS server. The optional
+// `allowFrom` argument is used to constrain which CIDR ranges can use the
+// created Account.
+func (c Client) RegisterAccount(allowFrom []string) (Account, error) {
+	var body []byte
+	if len(allowFrom) > 0 {
+		req := struct {
+			AllowFrom []string
+		}{
+			AllowFrom: allowFrom,
+		}
+		reqBody, err := json.Marshal(req)
+		if err != nil {
+			return Account{}, err
+		}
+		body = reqBody
+	}
+
+	url := fmt.Sprintf("%s/register", c.baseURL)
+	respBody, resp, err := postAPI(url, body, nil)
+	if err != nil {
+		return Account{}, err
+	}
+
+	if resp.StatusCode != http.StatusCreated {
+		return Account{}, newClientError(
+			"failed to register account", resp.StatusCode, respBody)
+	}
+
+	var acct Account
+	err = json.Unmarshal(respBody, &acct)
+	if err != nil {
+		return Account{}, err
+	}
+
+	return acct, nil
+}
+
+// UpdateTXTRecord updates a TXT record with the ACME DNS server to the `value`
+// provided using the `account` specified.
+func (c Client) UpdateTXTRecord(account Account, value string) error {
+	update := struct {
+		SubDomain string
+		Txt       string
+	}{
+		SubDomain: account.SubDomain,
+		Txt:       value,
+	}
+	updateBody, err := json.Marshal(update)
+	if err != nil {
+		fmt.Printf("Failed to marshal update: %s\n", update)
+		return err
+	}
+
+	headers := map[string]string{
+		"X-Api-User": account.Username,
+		"X-Api-Key":  account.Password,
+	}
+
+	url := fmt.Sprintf("%s/update", c.baseURL)
+	respBody, resp, err := postAPI(url, updateBody, headers)
+	if err != nil {
+		return err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return newClientError(
+			"failed to update txt record", resp.StatusCode, respBody)
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/cpu/goacmedns/storage.go b/vendor/github.com/cpu/goacmedns/storage.go
new file mode 100644
index 000000000..6e0186b0c
--- /dev/null
+++ b/vendor/github.com/cpu/goacmedns/storage.go
@@ -0,0 +1,89 @@
+package goacmedns
+
+import (
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"os"
+)
+
+// Storage is an interface describing the required functions for an ACME DNS
+// Account storage mechanism.
+type Storage interface {
+	// Save will persist the `Account` data that has been `Put` so far
+	Save() error
+	// Put will add an `Account` for the given domain to the storage. It may not
+	// be persisted until `Save` is called.
+	Put(string, Account) error
+	// Fetch will retrieve an `Account` for the given domain from the storage. If
+	// the provided domain does not have an `Account` saved in the storage
+	// `ErrDomainNotFound` will be returned
+	Fetch(string) (Account, error)
+}
+
+var (
+	// ErrDomainNotFound is returned from `Fetch` when the provided domain is not
+	// present in the storage.
+	ErrDomainNotFound = errors.New("requested domain is not present in storage")
+)
+
+// fileStorage implements the `Storage` interface and persists `Accounts` to
+// a JSON file on disk.
+type fileStorage struct {
+	// path is the filepath that the `accounts` are persisted to when the `Save`
+	// function is called.
+	path string
+	// mode is the file mode used when the `path` JSON file must be created
+	mode os.FileMode
+	// accounts holds the `Account` data that has been `Put` into the storage
+	accounts map[string]Account
+}
+
+// NewFileStorage returns a `Storage` implementation backed by JSON content
+// saved into the provided `path` on disk. The file at `path` will be created if
+// required. When creating a new file the provided `mode` is used to set the
+// permissions.
+func NewFileStorage(path string, mode os.FileMode) Storage {
+	fs := fileStorage{
+		path:     path,
+		mode:     mode,
+		accounts: make(map[string]Account),
+	}
+	// Opportunistically try to load the account data. Return an empty account if
+	// any errors occur.
+	if jsonData, err := ioutil.ReadFile(path); err == nil {
+		if err := json.Unmarshal(jsonData, &fs.accounts); err != nil {
+			return fs
+		}
+	}
+	return fs
+}
+
+// Save persists the `Account` data to the fileStorage's configured path. The
+// file at that path will be created with the fileStorage's mode if required.
+func (f fileStorage) Save() error {
+	if serialized, err := json.Marshal(f.accounts); err != nil {
+		return err
+	} else if err = ioutil.WriteFile(f.path, serialized, f.mode); err != nil {
+		return err
+	}
+	return nil
+}
+
+// Put saves an `Account` for the given `Domain` into the in-memory accounts of
+// the fileStorage instance. The `Account` data will not be written to disk
+// until the `Save` function is called
+func (f fileStorage) Put(domain string, acct Account) error {
+	f.accounts[domain] = acct
+	return nil
+}
+
+// Fetch retrieves the `Account` object for the given `domain` from the
+// fileStorage in-memory accounts. If the `domain` provided does not have an
+// `Account` in the storage an `ErrDomainNotFound` error is returned.
+func (f fileStorage) Fetch(domain string) (Account, error) {
+	if acct, exists := f.accounts[domain]; exists {
+		return acct, nil
+	}
+	return Account{}, ErrDomainNotFound
+}
diff --git a/vendor/github.com/xenolf/lego/providers/dns/acmedns/acmedns.go b/vendor/github.com/xenolf/lego/providers/dns/acmedns/acmedns.go
new file mode 100644
index 000000000..cce0d8d87
--- /dev/null
+++ b/vendor/github.com/xenolf/lego/providers/dns/acmedns/acmedns.go
@@ -0,0 +1,170 @@
+// Package acmedns implements a DNS provider for solving DNS-01 challenges using
+// Joohoi's acme-dns project. For more information see the ACME-DNS homepage:
+//    https://github.com/joohoi/acme-dns
+package acmedns
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/cpu/goacmedns"
+	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/platform/config/env"
+)
+
+const (
+	// envNamespace is the prefix for ACME-DNS environment variables.
+	envNamespace = "ACME_DNS_"
+	// apiBaseEnvVar is the environment variable name for the ACME-DNS API address
+	// (e.g. https://acmedns.your-domain.com).
+	apiBaseEnvVar = envNamespace + "API_BASE"
+	// storagePathEnvVar is the environment variable name for the ACME-DNS JSON
+	// account data file. A per-domain account will be registered/persisted to
+	// this file and used for TXT updates.
+	storagePathEnvVar = envNamespace + "STORAGE_PATH"
+)
+
+// acmeDNSClient is an interface describing the goacmedns.Client functions
+// the DNSProvider uses. It makes it easier for tests to shim a mock Client into
+// the DNSProvider.
+type acmeDNSClient interface {
+	// UpdateTXTRecord updates the provided account's TXT record to the given
+	// value or returns an error.
+	UpdateTXTRecord(goacmedns.Account, string) error
+	// RegisterAccount registers and returns a new account with the given
+	// allowFrom restriction or returns an error.
+	RegisterAccount([]string) (goacmedns.Account, error)
+}
+
+// DNSProvider is an implementation of the acme.ChallengeProvider interface for
+// an ACME-DNS server.
+type DNSProvider struct {
+	client  acmeDNSClient
+	storage goacmedns.Storage
+}
+
+// NewDNSProvider creates an ACME-DNS provider using file based account storage.
+// Its configuration is loaded from the environment by reading apiBaseEnvVar and
+// storagePathEnvVar.
+func NewDNSProvider() (*DNSProvider, error) {
+	values, err := env.Get(apiBaseEnvVar, storagePathEnvVar)
+	if err != nil {
+		return nil, fmt.Errorf("acme-dns: %v", err)
+	}
+
+	client := goacmedns.NewClient(values[apiBaseEnvVar])
+	storage := goacmedns.NewFileStorage(values[storagePathEnvVar], 0600)
+	return NewDNSProviderClient(client, storage)
+}
+
+// NewDNSProviderClient creates an ACME-DNS DNSProvider with the given
+// acmeDNSClient and goacmedns.Storage.
+func NewDNSProviderClient(client acmeDNSClient, storage goacmedns.Storage) (*DNSProvider, error) {
+	if client == nil {
+		return nil, errors.New("ACME-DNS Client must be not nil")
+	}
+
+	if storage == nil {
+		return nil, errors.New("ACME-DNS Storage must be not nil")
+	}
+
+	return &DNSProvider{
+		client:  client,
+		storage: storage,
+	}, nil
+}
+
+// ErrCNAMERequired is returned by Present when the Domain indicated had no
+// existing ACME-DNS account in the Storage and additional setup is required.
+// The user must create a CNAME in the DNS zone for Domain that aliases FQDN
+// to Target in order to complete setup for the ACME-DNS account that was
+// created.
+type ErrCNAMERequired struct {
+	// The Domain that is being issued for.
+	Domain string
+	// The alias of the CNAME (left hand DNS label).
+	FQDN string
+	// The RDATA of the CNAME (right hand side, canonical name).
+	Target string
+}
+
+// Error returns a descriptive message for the ErrCNAMERequired instance telling
+// the user that a CNAME needs to be added to the DNS zone of c.Domain before
+// the ACME-DNS hook will work. The CNAME to be created should be of the form:
+//   {{ c.FQDN }} 	CNAME	{{ c.Target }}
+func (e ErrCNAMERequired) Error() string {
+	return fmt.Sprintf("acme-dns: new account created for %q. "+
+		"To complete setup for %q you must provision the following "+
+		"CNAME in your DNS zone and re-run this provider when it is "+
+		"in place:\n"+
+		"%s CNAME %s.",
+		e.Domain, e.Domain, e.FQDN, e.Target)
+}
+
+// Present creates a TXT record to fulfil the DNS-01 challenge. If there is an
+// existing account for the domain in the provider's storage then it will be
+// used to set the challenge response TXT record with the ACME-DNS server and
+// issuance will continue. If there is not an account for the given domain
+// present in the DNSProvider storage one will be created and registered with
+// the ACME DNS server and an ErrCNAMERequired error is returned. This will halt
+// issuance and indicate to the user that a one-time manual setup is required
+// for the domain.
+func (d *DNSProvider) Present(domain, _, keyAuth string) error {
+	// Compute the challenge response FQDN and TXT value for the domain based
+	// on the keyAuth.
+	fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
+
+	// Check if credentials were previously saved for this domain.
+	account, err := d.storage.Fetch(domain)
+	// Errors other than goacmeDNS.ErrDomainNotFound are unexpected.
+	if err != nil && err != goacmedns.ErrDomainNotFound {
+		return err
+	}
+	if err == goacmedns.ErrDomainNotFound {
+		// The account did not exist. Create a new one and return an error
+		// indicating the required one-time manual CNAME setup.
+		return d.register(domain, fqdn)
+	}
+
+	// Update the acme-dns TXT record.
+	return d.client.UpdateTXTRecord(account, value)
+}
+
+// CleanUp removes the record matching the specified parameters. It is not
+// implemented for the ACME-DNS provider.
+func (d *DNSProvider) CleanUp(_, _, _ string) error {
+	// ACME-DNS doesn't support the notion of removing a record. For users of
+	// ACME-DNS it is expected the stale records remain in-place.
+	return nil
+}
+
+// register creates a new ACME-DNS account for the given domain. If account
+// creation works as expected a ErrCNAMERequired error is returned describing
+// the one-time manual CNAME setup required to complete setup of the ACME-DNS
+// hook for the domain. If any other error occurs it is returned as-is.
+func (d *DNSProvider) register(domain, fqdn string) error {
+	// TODO(@cpu): Read CIDR whitelists from the environment
+	newAcct, err := d.client.RegisterAccount(nil)
+	if err != nil {
+		return err
+	}
+
+	// Store the new account in the storage and call save to persist the data.
+	err = d.storage.Put(domain, newAcct)
+	if err != nil {
+		return err
+	}
+	err = d.storage.Save()
+	if err != nil {
+		return err
+	}
+
+	// Stop issuance by returning an error. The user needs to perform a manual
+	// one-time CNAME setup in their DNS zone to complete the setup of the new
+	// account we created.
+	return ErrCNAMERequired{
+		Domain: domain,
+		FQDN:   fqdn,
+		Target: newAcct.FullDomain,
+	}
+}
diff --git a/vendor/github.com/xenolf/lego/providers/dns/dns_providers.go b/vendor/github.com/xenolf/lego/providers/dns/dns_providers.go
index 96881c19d..ec8c31875 100644
--- a/vendor/github.com/xenolf/lego/providers/dns/dns_providers.go
+++ b/vendor/github.com/xenolf/lego/providers/dns/dns_providers.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/providers/dns/acmedns"
 	"github.com/xenolf/lego/providers/dns/auroradns"
 	"github.com/xenolf/lego/providers/dns/azure"
 	"github.com/xenolf/lego/providers/dns/bluecat"
@@ -43,6 +44,8 @@ import (
 // NewDNSChallengeProviderByName Factory for DNS providers
 func NewDNSChallengeProviderByName(name string) (acme.ChallengeProvider, error) {
 	switch name {
+	case "acme-dns":
+		return acmedns.NewDNSProvider()
 	case "azure":
 		return azure.NewDNSProvider()
 	case "auroradns":
diff --git a/vendor/github.com/xenolf/lego/providers/dns/duckdns/duckdns.go b/vendor/github.com/xenolf/lego/providers/dns/duckdns/duckdns.go
index e00f71370..a8e25ba8b 100644
--- a/vendor/github.com/xenolf/lego/providers/dns/duckdns/duckdns.go
+++ b/vendor/github.com/xenolf/lego/providers/dns/duckdns/duckdns.go
@@ -30,26 +30,32 @@ func NewDNSProvider() (*DNSProvider, error) {
 
 // NewDNSProviderCredentials uses the supplied credentials to return a
 // DNSProvider instance configured for http://duckdns.org .
-func NewDNSProviderCredentials(duckdnsToken string) (*DNSProvider, error) {
-	if duckdnsToken == "" {
+func NewDNSProviderCredentials(token string) (*DNSProvider, error) {
+	if token == "" {
 		return nil, errors.New("DuckDNS: credentials missing")
 	}
 
-	return &DNSProvider{token: duckdnsToken}, nil
+	return &DNSProvider{token: token}, nil
 }
 
-// makeDuckdnsURL creates a url to clear the set or unset the TXT record.
-// txt == "" will clear the TXT record.
-func makeDuckdnsURL(domain, token, txt string) string {
-	requestBase := fmt.Sprintf("https://www.duckdns.org/update?domains=%s&token=%s", domain, token)
-	if txt == "" {
-		return requestBase + "&clear=true"
-	}
-	return requestBase + "&txt=" + txt
+// Present creates a TXT record to fulfil the dns-01 challenge.
+func (d *DNSProvider) Present(domain, token, keyAuth string) error {
+	_, txtRecord, _ := acme.DNS01Record(domain, keyAuth)
+	return updateTxtRecord(domain, d.token, txtRecord, false)
 }
 
-func issueDuckdnsRequest(url string) error {
-	response, err := acme.HTTPClient.Get(url)
+// CleanUp clears DuckDNS TXT record
+func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
+	return updateTxtRecord(domain, d.token, "", true)
+}
+
+// updateTxtRecord Update the domains TXT record
+// To update the TXT record we just need to make one simple get request.
+// In DuckDNS you only have one TXT record shared with the domain and all sub domains.
+func updateTxtRecord(domain, token, txt string, clear bool) error {
+	u := fmt.Sprintf("https://www.duckdns.org/update?domains=%s&token=%s&clear=%t&txt=%s", domain, token, clear, txt)
+
+	response, err := acme.HTTPClient.Get(u)
 	if err != nil {
 		return err
 	}
@@ -59,26 +65,10 @@ func issueDuckdnsRequest(url string) error {
 	if err != nil {
 		return err
 	}
+
 	body := string(bodyBytes)
 	if body != "OK" {
-		return fmt.Errorf("Request to change TXT record for duckdns returned the following result (%s) this does not match expectation (OK) used url [%s]", body, url)
+		return fmt.Errorf("request to change TXT record for DuckDNS returned the following result (%s) this does not match expectation (OK) used url [%s]", body, u)
 	}
 	return nil
 }
-
-// Present creates a TXT record to fulfil the dns-01 challenge.
-// In duckdns you only have one TXT record shared with
-// the domain and all sub domains.
-//
-// To update the TXT record we just need to make one simple get request.
-func (d *DNSProvider) Present(domain, token, keyAuth string) error {
-	_, txtRecord, _ := acme.DNS01Record(domain, keyAuth)
-	url := makeDuckdnsURL(domain, d.token, txtRecord)
-	return issueDuckdnsRequest(url)
-}
-
-// CleanUp clears duckdns TXT record
-func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
-	url := makeDuckdnsURL(domain, d.token, "")
-	return issueDuckdnsRequest(url)
-}
diff --git a/vendor/github.com/xenolf/lego/providers/dns/exec/doc.go b/vendor/github.com/xenolf/lego/providers/dns/exec/doc.go
new file mode 100644
index 000000000..9aa53fccc
--- /dev/null
+++ b/vendor/github.com/xenolf/lego/providers/dns/exec/doc.go
@@ -0,0 +1,42 @@
+/*
+Package exec implements a manual DNS provider which runs a program for adding/removing the DNS record.
+
+The file name of the external program is specified in the environment variable `EXEC_PATH`.
+When it is run by lego, three command-line parameters are passed to it:
+The action ("present" or "cleanup"), the fully-qualified domain name, the value for the record and the TTL.
+
+For example, requesting a certificate for the domain 'foo.example.com' can be achieved by calling lego as follows:
+
+	EXEC_PATH=./update-dns.sh \
+		lego --dns exec \
+		--domains foo.example.com \
+		--email invalid@example.com run
+
+It will then call the program './update-dns.sh' with like this:
+
+	./update-dns.sh "present" "_acme-challenge.foo.example.com." "MsijOYZxqyjGnFGwhjrhfg-Xgbl5r68WPda0J9EgqqI" "120"
+
+The program then needs to make sure the record is inserted.
+When it returns an error via a non-zero exit code, lego aborts.
+
+When the record is to be removed again,
+the program is called with the first command-line parameter set to "cleanup" instead of "present".
+
+If you want to use the raw domain, token, and keyAuth values with your program, you can set `EXEC_MODE=RAW`:
+
+	EXEC_MODE=RAW \
+	EXEC_PATH=./update-dns.sh \
+		lego --dns exec \
+		--domains foo.example.com \
+		--email invalid@example.com run
+
+It will then call the program './update-dns.sh' like this:
+
+	./update-dns.sh "present" "foo.example.com." "--" "some-token" "KxAy-J3NwUmg9ZQuM-gP_Mq1nStaYSaP9tYQs5_-YsE.ksT-qywTd8058G-SHHWA3RAN72Pr0yWtPYmmY5UBpQ8"
+
+NOTE:
+The `--` is because the token MAY start with a `-`, and the called program may try and interpret a - as indicating a flag.
+In the case of urfave, which is commonly used,
+you can use the `--` delimiter to specify the start of positional arguments, and handle such a string safely.
+*/
+package exec
diff --git a/vendor/github.com/xenolf/lego/providers/dns/exec/exec.go b/vendor/github.com/xenolf/lego/providers/dns/exec/exec.go
index 9bd97d03e..ea3a43983 100644
--- a/vendor/github.com/xenolf/lego/providers/dns/exec/exec.go
+++ b/vendor/github.com/xenolf/lego/providers/dns/exec/exec.go
@@ -1,78 +1,100 @@
-// Package exec implements a manual DNS provider which runs a program for
-// adding/removing the DNS record.
-//
-// The file name of the external program is specified in the environment
-// variable EXEC_PATH. When it is run by lego, three command-line parameters
-// are passed to it: The action ("present" or "cleanup"), the fully-qualified domain
-// name, the value for the record and the TTL.
-//
-// For example, requesting a certificate for the domain 'foo.example.com' can
-// be achieved by calling lego as follows:
-//
-//  EXEC_PATH=./update-dns.sh \
-//    lego --dns exec \
-//    --domains foo.example.com \
-//    --email invalid@example.com run
-//
-// It will then call the program './update-dns.sh' with like this:
-//
-//  ./update-dns.sh "present" "_acme-challenge.foo.example.com." "MsijOYZxqyjGnFGwhjrhfg-Xgbl5r68WPda0J9EgqqI" "120"
-//
-// The program then needs to make sure the record is inserted. When it returns
-// an error via a non-zero exit code, lego aborts.
-//
-// When the record is to be removed again, the program is called with the first
-// command-line parameter set to "cleanup" instead of "present".
 package exec
 
 import (
 	"errors"
+	"fmt"
 	"os"
 	"os/exec"
 	"strconv"
 
 	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/log"
+	"github.com/xenolf/lego/platform/config/env"
 )
 
+// Config Provider configuration.
+type Config struct {
+	Program string
+	Mode    string
+}
+
 // DNSProvider adds and removes the record for the DNS challenge by calling a
 // program with command-line parameters.
 type DNSProvider struct {
-	program string
+	config *Config
 }
 
 // NewDNSProvider returns a new DNS provider which runs the program in the
 // environment variable EXEC_PATH for adding and removing the DNS record.
 func NewDNSProvider() (*DNSProvider, error) {
-	s := os.Getenv("EXEC_PATH")
-	if s == "" {
-		return nil, errors.New("environment variable EXEC_PATH not set")
+	values, err := env.Get("EXEC_PATH")
+	if err != nil {
+		return nil, fmt.Errorf("exec: %v", err)
 	}
 
-	return NewDNSProviderProgram(s)
+	return NewDNSProviderConfig(&Config{
+		Program: values["EXEC_PATH"],
+		Mode:    os.Getenv("EXEC_MODE"),
+	})
+}
+
+// NewDNSProviderConfig returns a new DNS provider which runs the given configuration
+// for adding and removing the DNS record.
+func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
+	if config == nil {
+		return nil, errors.New("the configuration is nil")
+	}
+
+	return &DNSProvider{config: config}, nil
 }
 
 // NewDNSProviderProgram returns a new DNS provider which runs the given program
 // for adding and removing the DNS record.
+// Deprecated: use NewDNSProviderConfig instead
 func NewDNSProviderProgram(program string) (*DNSProvider, error) {
-	return &DNSProvider{program: program}, nil
+	if len(program) == 0 {
+		return nil, errors.New("the program is undefined")
+	}
+
+	return NewDNSProviderConfig(&Config{Program: program})
 }
 
 // Present creates a TXT record to fulfil the dns-01 challenge.
 func (d *DNSProvider) Present(domain, token, keyAuth string) error {
-	fqdn, value, ttl := acme.DNS01Record(domain, keyAuth)
-	cmd := exec.Command(d.program, "present", fqdn, value, strconv.Itoa(ttl))
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
+	var args []string
+	if d.config.Mode == "RAW" {
+		args = []string{"present", "--", domain, token, keyAuth}
+	} else {
+		fqdn, value, ttl := acme.DNS01Record(domain, keyAuth)
+		args = []string{"present", fqdn, value, strconv.Itoa(ttl)}
+	}
 
-	return cmd.Run()
+	cmd := exec.Command(d.config.Program, args...)
+
+	output, err := cmd.CombinedOutput()
+	if len(output) > 0 {
+		log.Println(string(output))
+	}
+
+	return err
 }
 
 // CleanUp removes the TXT record matching the specified parameters
 func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
-	fqdn, value, ttl := acme.DNS01Record(domain, keyAuth)
-	cmd := exec.Command(d.program, "cleanup", fqdn, value, strconv.Itoa(ttl))
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
+	var args []string
+	if d.config.Mode == "RAW" {
+		args = []string{"cleanup", "--", domain, token, keyAuth}
+	} else {
+		fqdn, value, ttl := acme.DNS01Record(domain, keyAuth)
+		args = []string{"cleanup", fqdn, value, strconv.Itoa(ttl)}
+	}
 
-	return cmd.Run()
+	cmd := exec.Command(d.config.Program, args...)
+
+	output, err := cmd.CombinedOutput()
+	if len(output) > 0 {
+		log.Println(string(output))
+	}
+
+	return err
 }
diff --git a/vendor/github.com/xenolf/lego/providers/dns/gcloud/googlecloud.go b/vendor/github.com/xenolf/lego/providers/dns/gcloud/googlecloud.go
index 2999a79dc..0f169677a 100644
--- a/vendor/github.com/xenolf/lego/providers/dns/gcloud/googlecloud.go
+++ b/vendor/github.com/xenolf/lego/providers/dns/gcloud/googlecloud.go
@@ -115,13 +115,13 @@ func (d *DNSProvider) Present(domain, token, keyAuth string) error {
 	}
 
 	// Look for existing records.
-	list, err := d.client.ResourceRecordSets.List(d.project, zone).Name(fqdn).Type("TXT").Do()
+	existing, err := d.findTxtRecords(zone, fqdn)
 	if err != nil {
 		return err
 	}
-	if len(list.Rrsets) > 0 {
+	if len(existing) > 0 {
 		// Attempt to delete the existing records when adding our new one.
-		change.Deletions = list.Rrsets
+		change.Deletions = existing
 	}
 
 	chg, err := d.client.Changes.Create(d.project, zone, change).Do()
@@ -156,16 +156,12 @@ func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
 		return err
 	}
 
-	for _, rec := range records {
-		change := &dns.Change{
-			Deletions: []*dns.ResourceRecordSet{rec},
-		}
-		_, err = d.client.Changes.Create(d.project, zone, change).Do()
-		if err != nil {
-			return err
-		}
+	if len(records) == 0 {
+		return nil
 	}
-	return nil
+
+	_, err = d.client.Changes.Create(d.project, zone, &dns.Change{Deletions: records}).Do()
+	return err
 }
 
 // Timeout customizes the timeout values used by the ACME package for checking
@@ -198,17 +194,10 @@ func (d *DNSProvider) getHostedZone(domain string) (string, error) {
 
 func (d *DNSProvider) findTxtRecords(zone, fqdn string) ([]*dns.ResourceRecordSet, error) {
 
-	recs, err := d.client.ResourceRecordSets.List(d.project, zone).Do()
+	recs, err := d.client.ResourceRecordSets.List(d.project, zone).Name(fqdn).Type("TXT").Do()
 	if err != nil {
 		return nil, err
 	}
 
-	var found []*dns.ResourceRecordSet
-	for _, r := range recs.Rrsets {
-		if r.Type == "TXT" && r.Name == fqdn {
-			found = append(found, r)
-		}
-	}
-
-	return found, nil
+	return recs.Rrsets, nil
 }
diff --git a/vendor/github.com/xenolf/lego/providers/dns/ns1/ns1.go b/vendor/github.com/xenolf/lego/providers/dns/ns1/ns1.go
index d37da4cdb..148747bde 100644
--- a/vendor/github.com/xenolf/lego/providers/dns/ns1/ns1.go
+++ b/vendor/github.com/xenolf/lego/providers/dns/ns1/ns1.go
@@ -5,6 +5,7 @@ package ns1
 import (
 	"fmt"
 	"net/http"
+	"strings"
 	"time"
 
 	"github.com/xenolf/lego/acme"
@@ -75,7 +76,12 @@ func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
 }
 
 func (d *DNSProvider) getHostedZone(domain string) (*dns.Zone, error) {
-	zone, _, err := d.client.Zones.Get(domain)
+	authZone, err := getAuthZone(domain)
+	if err != nil {
+		return nil, err
+	}
+
+	zone, _, err := d.client.Zones.Get(authZone)
 	if err != nil {
 		return nil, err
 	}
@@ -83,6 +89,19 @@ func (d *DNSProvider) getHostedZone(domain string) (*dns.Zone, error) {
 	return zone, nil
 }
 
+func getAuthZone(fqdn string) (string, error) {
+	authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
+	if err != nil {
+		return "", err
+	}
+
+	if strings.HasSuffix(authZone, ".") {
+		authZone = authZone[:len(authZone)-len(".")]
+	}
+
+	return authZone, err
+}
+
 func (d *DNSProvider) newTxtRecord(zone *dns.Zone, fqdn, value string, ttl int) *dns.Record {
 	name := acme.UnFqdn(fqdn)
 
diff --git a/vendor/github.com/xenolf/lego/providers/dns/route53/route53.go b/vendor/github.com/xenolf/lego/providers/dns/route53/route53.go
index adc15401c..d7cc4c719 100644
--- a/vendor/github.com/xenolf/lego/providers/dns/route53/route53.go
+++ b/vendor/github.com/xenolf/lego/providers/dns/route53/route53.go
@@ -3,6 +3,7 @@
 package route53
 
 import (
+	"errors"
 	"fmt"
 	"math/rand"
 	"os"
@@ -17,15 +18,30 @@ import (
 	"github.com/xenolf/lego/acme"
 )
 
-const (
-	maxRetries = 5
-	route53TTL = 10
-)
+// Config is used to configure the creation of the DNSProvider
+type Config struct {
+	MaxRetries         int
+	TTL                int
+	PropagationTimeout time.Duration
+	PollingInterval    time.Duration
+	HostedZoneID       string
+}
+
+// NewDefaultConfig returns a default configuration for the DNSProvider
+func NewDefaultConfig() *Config {
+	return &Config{
+		MaxRetries:         5,
+		TTL:                10,
+		PropagationTimeout: time.Minute * 2,
+		PollingInterval:    time.Second * 4,
+		HostedZoneID:       os.Getenv("AWS_HOSTED_ZONE_ID"),
+	}
+}
 
 // DNSProvider implements the acme.ChallengeProvider interface
 type DNSProvider struct {
-	client       *route53.Route53
-	hostedZoneID string
+	client *route53.Route53
+	config *Config
 }
 
 // customRetryer implements the client.Retryer interface by composing the
@@ -65,35 +81,49 @@ func (d customRetryer) RetryRules(r *request.Request) time.Duration {
 //
 // See also: https://github.com/aws/aws-sdk-go/wiki/configuring-sdk
 func NewDNSProvider() (*DNSProvider, error) {
-	hostedZoneID := os.Getenv("AWS_HOSTED_ZONE_ID")
+	return NewDNSProviderConfig(NewDefaultConfig())
+}
+
+// NewDNSProviderConfig takes a given config ans returns a custom configured
+// DNSProvider instance
+func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
+	if config == nil {
+		return nil, errors.New("the configuration of the Route53 DNS provider is nil")
+	}
 
 	r := customRetryer{}
-	r.NumMaxRetries = maxRetries
-	config := request.WithRetryer(aws.NewConfig(), r)
-	session, err := session.NewSessionWithOptions(session.Options{Config: *config})
+	r.NumMaxRetries = config.MaxRetries
+	sessionCfg := request.WithRetryer(aws.NewConfig(), r)
+	session, err := session.NewSessionWithOptions(session.Options{Config: *sessionCfg})
 	if err != nil {
 		return nil, err
 	}
 	client := route53.New(session)
 
 	return &DNSProvider{
-		client:       client,
-		hostedZoneID: hostedZoneID,
+		client: client,
+		config: config,
 	}, nil
 }
 
+// Timeout returns the timeout and interval to use when checking for DNS
+// propagation.
+func (r *DNSProvider) Timeout() (timeout, interval time.Duration) {
+	return r.config.PropagationTimeout, r.config.PollingInterval
+}
+
 // Present creates a TXT record using the specified parameters
 func (r *DNSProvider) Present(domain, token, keyAuth string) error {
 	fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
 	value = `"` + value + `"`
-	return r.changeRecord("UPSERT", fqdn, value, route53TTL)
+	return r.changeRecord("UPSERT", fqdn, value, r.config.TTL)
 }
 
 // CleanUp removes the TXT record matching the specified parameters
 func (r *DNSProvider) CleanUp(domain, token, keyAuth string) error {
 	fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
 	value = `"` + value + `"`
-	return r.changeRecord("DELETE", fqdn, value, route53TTL)
+	return r.changeRecord("DELETE", fqdn, value, r.config.TTL)
 }
 
 func (r *DNSProvider) changeRecord(action, fqdn, value string, ttl int) error {
@@ -123,7 +153,7 @@ func (r *DNSProvider) changeRecord(action, fqdn, value string, ttl int) error {
 
 	statusID := resp.ChangeInfo.Id
 
-	return acme.WaitFor(120*time.Second, 4*time.Second, func() (bool, error) {
+	return acme.WaitFor(r.config.PropagationTimeout, r.config.PollingInterval, func() (bool, error) {
 		reqParams := &route53.GetChangeInput{
 			Id: statusID,
 		}
@@ -139,8 +169,8 @@ func (r *DNSProvider) changeRecord(action, fqdn, value string, ttl int) error {
 }
 
 func (r *DNSProvider) getHostedZoneID(fqdn string) (string, error) {
-	if r.hostedZoneID != "" {
-		return r.hostedZoneID, nil
+	if r.config.HostedZoneID != "" {
+		return r.config.HostedZoneID, nil
 	}
 
 	authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)