267 lines
6.5 KiB
Go
267 lines
6.5 KiB
Go
// Package dyn implements a DNS provider for solving the DNS-01 challenge
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// using Dyn Managed DNS.
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package dyn
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"net/http"
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"strconv"
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"time"
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"github.com/xenolf/lego/acme"
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"github.com/xenolf/lego/platform/config/env"
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)
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var dynBaseURL = "https://api.dynect.net/REST"
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type dynResponse struct {
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// One of 'success', 'failure', or 'incomplete'
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Status string `json:"status"`
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// The structure containing the actual results of the request
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Data json.RawMessage `json:"data"`
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// The ID of the job that was created in response to a request.
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JobID int `json:"job_id"`
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// A list of zero or more messages
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Messages json.RawMessage `json:"msgs"`
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}
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// DNSProvider is an implementation of the acme.ChallengeProvider interface that uses
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// Dyn's Managed DNS API to manage TXT records for a domain.
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type DNSProvider struct {
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customerName string
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userName string
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password string
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token string
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}
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// NewDNSProvider returns a DNSProvider instance configured for Dyn DNS.
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// Credentials must be passed in the environment variables: DYN_CUSTOMER_NAME,
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// DYN_USER_NAME and DYN_PASSWORD.
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get("DYN_CUSTOMER_NAME", "DYN_USER_NAME", "DYN_PASSWORD")
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if err != nil {
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return nil, fmt.Errorf("DynDNS: %v", err)
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}
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return NewDNSProviderCredentials(values["DYN_CUSTOMER_NAME"], values["DYN_USER_NAME"], values["DYN_PASSWORD"])
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}
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// NewDNSProviderCredentials uses the supplied credentials to return a
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// DNSProvider instance configured for Dyn DNS.
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func NewDNSProviderCredentials(customerName, userName, password string) (*DNSProvider, error) {
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if customerName == "" || userName == "" || password == "" {
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return nil, fmt.Errorf("DynDNS credentials missing")
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}
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return &DNSProvider{
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customerName: customerName,
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userName: userName,
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password: password,
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}, nil
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}
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func (d *DNSProvider) sendRequest(method, resource string, payload interface{}) (*dynResponse, error) {
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url := fmt.Sprintf("%s/%s", dynBaseURL, resource)
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body, err := json.Marshal(payload)
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest(method, url, bytes.NewReader(body))
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if err != nil {
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return nil, err
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}
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req.Header.Set("Content-Type", "application/json")
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if len(d.token) > 0 {
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req.Header.Set("Auth-Token", d.token)
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}
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client := &http.Client{Timeout: 10 * time.Second}
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resp, err := client.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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if resp.StatusCode >= 500 {
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return nil, fmt.Errorf("Dyn API request failed with HTTP status code %d", resp.StatusCode)
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}
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var dynRes dynResponse
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err = json.NewDecoder(resp.Body).Decode(&dynRes)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode >= 400 {
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return nil, fmt.Errorf("Dyn API request failed with HTTP status code %d: %s", resp.StatusCode, dynRes.Messages)
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} else if resp.StatusCode == 307 {
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// TODO add support for HTTP 307 response and long running jobs
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return nil, fmt.Errorf("Dyn API request returned HTTP 307. This is currently unsupported")
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}
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if dynRes.Status == "failure" {
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// TODO add better error handling
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return nil, fmt.Errorf("Dyn API request failed: %s", dynRes.Messages)
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}
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return &dynRes, nil
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}
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// Starts a new Dyn API Session. Authenticates using customerName, userName,
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// password and receives a token to be used in for subsequent requests.
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func (d *DNSProvider) login() error {
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type creds struct {
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Customer string `json:"customer_name"`
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User string `json:"user_name"`
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Pass string `json:"password"`
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}
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type session struct {
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Token string `json:"token"`
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Version string `json:"version"`
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}
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payload := &creds{Customer: d.customerName, User: d.userName, Pass: d.password}
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dynRes, err := d.sendRequest("POST", "Session", payload)
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if err != nil {
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return err
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}
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var s session
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err = json.Unmarshal(dynRes.Data, &s)
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if err != nil {
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return err
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}
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d.token = s.Token
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return nil
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}
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// Destroys Dyn Session
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func (d *DNSProvider) logout() error {
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if len(d.token) == 0 {
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// nothing to do
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return nil
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}
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url := fmt.Sprintf("%s/Session", dynBaseURL)
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req, err := http.NewRequest("DELETE", url, nil)
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if err != nil {
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return err
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("Auth-Token", d.token)
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client := &http.Client{Timeout: 10 * time.Second}
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resp, err := client.Do(req)
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if err != nil {
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return err
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}
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resp.Body.Close()
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if resp.StatusCode != 200 {
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return fmt.Errorf("Dyn API request failed to delete session with HTTP status code %d", resp.StatusCode)
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}
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d.token = ""
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return nil
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}
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// Present creates a TXT record using the specified parameters
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func (d *DNSProvider) Present(domain, token, keyAuth string) error {
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fqdn, value, ttl := acme.DNS01Record(domain, keyAuth)
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authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
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if err != nil {
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return err
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}
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err = d.login()
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if err != nil {
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return err
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}
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data := map[string]interface{}{
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"rdata": map[string]string{
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"txtdata": value,
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},
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"ttl": strconv.Itoa(ttl),
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}
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resource := fmt.Sprintf("TXTRecord/%s/%s/", authZone, fqdn)
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_, err = d.sendRequest("POST", resource, data)
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if err != nil {
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return err
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}
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err = d.publish(authZone, "Added TXT record for ACME dns-01 challenge using lego client")
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if err != nil {
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return err
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}
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return d.logout()
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}
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func (d *DNSProvider) publish(zone, notes string) error {
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type publish struct {
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Publish bool `json:"publish"`
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Notes string `json:"notes"`
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}
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pub := &publish{Publish: true, Notes: notes}
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resource := fmt.Sprintf("Zone/%s/", zone)
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_, err := d.sendRequest("PUT", resource, pub)
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return err
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}
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// CleanUp removes the TXT record matching the specified parameters
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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fqdn, _, _ := acme.DNS01Record(domain, keyAuth)
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authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
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if err != nil {
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return err
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}
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err = d.login()
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if err != nil {
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return err
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}
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resource := fmt.Sprintf("TXTRecord/%s/%s/", authZone, fqdn)
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url := fmt.Sprintf("%s/%s", dynBaseURL, resource)
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req, err := http.NewRequest("DELETE", url, nil)
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if err != nil {
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return err
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("Auth-Token", d.token)
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client := &http.Client{Timeout: 10 * time.Second}
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resp, err := client.Do(req)
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if err != nil {
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return err
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}
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resp.Body.Close()
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if resp.StatusCode != 200 {
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return fmt.Errorf("Dyn API request failed to delete TXT record HTTP status code %d", resp.StatusCode)
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}
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err = d.publish(authZone, "Removed TXT record for ACME dns-01 challenge using lego client")
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if err != nil {
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return err
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}
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return d.logout()
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}
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