traefik/vendor/github.com/xenolf/lego/providers/dns/rackspace/rackspace.go
2018-10-15 09:40:02 +02:00

297 lines
8.2 KiB
Go

// Package rackspace implements a DNS provider for solving the DNS-01
// challenge using rackspace DNS.
package rackspace
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"time"
"github.com/xenolf/lego/acme"
"github.com/xenolf/lego/platform/config/env"
)
// defaultBaseURL represents the Identity API endpoint to call
const defaultBaseURL = "https://identity.api.rackspacecloud.com/v2.0/tokens"
// Config is used to configure the creation of the DNSProvider
type Config struct {
BaseURL string
APIUser string
APIKey string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
BaseURL: defaultBaseURL,
TTL: env.GetOrDefaultInt("RACKSPACE_TTL", 300),
PropagationTimeout: env.GetOrDefaultSecond("RACKSPACE_PROPAGATION_TIMEOUT", acme.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond("RACKSPACE_POLLING_INTERVAL", acme.DefaultPollingInterval),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond("RACKSPACE_HTTP_TIMEOUT", 30*time.Second),
},
}
}
// DNSProvider is an implementation of the acme.ChallengeProvider interface
// used to store the reusable token and DNS API endpoint
type DNSProvider struct {
config *Config
token string
cloudDNSEndpoint string
}
// NewDNSProvider returns a DNSProvider instance configured for Rackspace.
// Credentials must be passed in the environment variables:
// RACKSPACE_USER and RACKSPACE_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("RACKSPACE_USER", "RACKSPACE_API_KEY")
if err != nil {
return nil, fmt.Errorf("rackspace: %v", err)
}
config := NewDefaultConfig()
config.APIUser = values["RACKSPACE_USER"]
config.APIKey = values["RACKSPACE_API_KEY"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderCredentials uses the supplied credentials
// to return a DNSProvider instance configured for Rackspace.
// It authenticates against the API, also grabbing the DNS Endpoint.
// Deprecated
func NewDNSProviderCredentials(user, key string) (*DNSProvider, error) {
config := NewDefaultConfig()
config.APIUser = user
config.APIKey = key
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Rackspace.
// It authenticates against the API, also grabbing the DNS Endpoint.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("rackspace: the configuration of the DNS provider is nil")
}
if config.APIUser == "" || config.APIKey == "" {
return nil, fmt.Errorf("rackspace: credentials missing")
}
identity, err := login(config)
if err != nil {
return nil, fmt.Errorf("rackspace: %v", err)
}
// Iterate through the Service Catalog to get the DNS Endpoint
var dnsEndpoint string
for _, service := range identity.Access.ServiceCatalog {
if service.Name == "cloudDNS" {
dnsEndpoint = service.Endpoints[0].PublicURL
break
}
}
if dnsEndpoint == "" {
return nil, fmt.Errorf("rackspace: failed to populate DNS endpoint, check Rackspace API for changes")
}
return &DNSProvider{
config: config,
token: identity.Access.Token.ID,
cloudDNSEndpoint: dnsEndpoint,
}, nil
}
// Present creates a TXT record to fulfill the dns-01 challenge
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
zoneID, err := d.getHostedZoneID(fqdn)
if err != nil {
return fmt.Errorf("rackspace: %v", err)
}
rec := Records{
Record: []Record{{
Name: acme.UnFqdn(fqdn),
Type: "TXT",
Data: value,
TTL: d.config.TTL,
}},
}
body, err := json.Marshal(rec)
if err != nil {
return fmt.Errorf("rackspace: %v", err)
}
_, err = d.makeRequest(http.MethodPost, fmt.Sprintf("/domains/%d/records", zoneID), bytes.NewReader(body))
if err != nil {
return fmt.Errorf("rackspace: %v", err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _, _ := acme.DNS01Record(domain, keyAuth)
zoneID, err := d.getHostedZoneID(fqdn)
if err != nil {
return fmt.Errorf("rackspace: %v", err)
}
record, err := d.findTxtRecord(fqdn, zoneID)
if err != nil {
return fmt.Errorf("rackspace: %v", err)
}
_, err = d.makeRequest(http.MethodDelete, fmt.Sprintf("/domains/%d/records?id=%s", zoneID, record.ID), nil)
if err != nil {
return fmt.Errorf("rackspace: %v", err)
}
return nil
}
// Timeout returns the timeout and interval to use when checking for DNS propagation.
// Adjusting here to cope with spikes in propagation times.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
}
// getHostedZoneID performs a lookup to get the DNS zone which needs
// modifying for a given FQDN
func (d *DNSProvider) getHostedZoneID(fqdn string) (int, error) {
authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
if err != nil {
return 0, err
}
result, err := d.makeRequest(http.MethodGet, fmt.Sprintf("/domains?name=%s", acme.UnFqdn(authZone)), nil)
if err != nil {
return 0, err
}
var zoneSearchResponse ZoneSearchResponse
err = json.Unmarshal(result, &zoneSearchResponse)
if err != nil {
return 0, err
}
// If nothing was returned, or for whatever reason more than 1 was returned (the search uses exact match, so should not occur)
if zoneSearchResponse.TotalEntries != 1 {
return 0, fmt.Errorf("found %d zones for %s in Rackspace for domain %s", zoneSearchResponse.TotalEntries, authZone, fqdn)
}
return zoneSearchResponse.HostedZones[0].ID, nil
}
// findTxtRecord searches a DNS zone for a TXT record with a specific name
func (d *DNSProvider) findTxtRecord(fqdn string, zoneID int) (*Record, error) {
result, err := d.makeRequest(http.MethodGet, fmt.Sprintf("/domains/%d/records?type=TXT&name=%s", zoneID, acme.UnFqdn(fqdn)), nil)
if err != nil {
return nil, err
}
var records Records
err = json.Unmarshal(result, &records)
if err != nil {
return nil, err
}
switch len(records.Record) {
case 1:
case 0:
return nil, fmt.Errorf("no TXT record found for %s", fqdn)
default:
return nil, fmt.Errorf("more than 1 TXT record found for %s", fqdn)
}
return &records.Record[0], nil
}
// makeRequest is a wrapper function used for making DNS API requests
func (d *DNSProvider) makeRequest(method, uri string, body io.Reader) (json.RawMessage, error) {
url := d.cloudDNSEndpoint + uri
req, err := http.NewRequest(method, url, body)
if err != nil {
return nil, err
}
req.Header.Set("X-Auth-Token", d.token)
req.Header.Set("Content-Type", "application/json")
resp, err := d.config.HTTPClient.Do(req)
if err != nil {
return nil, fmt.Errorf("error querying DNS API: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusAccepted {
return nil, fmt.Errorf("request failed for %s %s. Response code: %d", method, url, resp.StatusCode)
}
var r json.RawMessage
err = json.NewDecoder(resp.Body).Decode(&r)
if err != nil {
return nil, fmt.Errorf("JSON decode failed for %s %s. Response code: %d", method, url, resp.StatusCode)
}
return r, nil
}
func login(config *Config) (*Identity, error) {
authData := AuthData{
Auth: Auth{
APIKeyCredentials: APIKeyCredentials{
Username: config.APIUser,
APIKey: config.APIKey,
},
},
}
body, err := json.Marshal(authData)
if err != nil {
return nil, err
}
req, err := http.NewRequest(http.MethodPost, config.BaseURL, bytes.NewReader(body))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
resp, err := config.HTTPClient.Do(req)
if err != nil {
return nil, fmt.Errorf("error querying Identity API: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("authentication failed: response code: %d", resp.StatusCode)
}
var identity Identity
err = json.NewDecoder(resp.Body).Decode(&identity)
if err != nil {
return nil, err
}
return &identity, nil
}