mirror of
https://github.com/go-acme/lego.git
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442 lines
12 KiB
Go
442 lines
12 KiB
Go
// Package bluecat implements a DNS provider for solving the DNS-01 challenge
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// using a self-hosted Bluecat Address Manager.
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package bluecat
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"regexp"
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"strconv"
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"strings"
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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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const configType = "Configuration"
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const viewType = "View"
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const txtType = "TXTRecord"
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const zoneType = "Zone"
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// Config is used to configure the creation of the DNSProvider
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type Config struct {
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BaseURL string
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UserName string
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Password string
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ConfigName string
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DNSView string
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PropagationTimeout time.Duration
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PollingInterval time.Duration
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TTL int
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HTTPClient *http.Client
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}
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// NewDefaultConfig returns a default configuration for the DNSProvider
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func NewDefaultConfig() *Config {
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return &Config{
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TTL: env.GetOrDefaultInt("BLUECAT_TTL", 120),
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PropagationTimeout: env.GetOrDefaultSecond("BLUECAT_PROPAGATION_TIMEOUT", acme.DefaultPropagationTimeout),
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PollingInterval: env.GetOrDefaultSecond("BLUECAT_POLLING_INTERVAL", acme.DefaultPollingInterval),
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HTTPClient: &http.Client{
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Timeout: env.GetOrDefaultSecond("BLUECAT_HTTP_TIMEOUT", 30*time.Second),
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},
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}
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}
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// DNSProvider is an implementation of the acme.ChallengeProvider interface that uses
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// Bluecat's Address Manager REST API to manage TXT records for a domain.
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type DNSProvider struct {
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config *Config
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token string
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}
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// NewDNSProvider returns a DNSProvider instance configured for Bluecat DNS.
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// Credentials must be passed in the environment variables: BLUECAT_SERVER_URL, BLUECAT_USER_NAME and BLUECAT_PASSWORD.
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// BLUECAT_SERVER_URL should have the scheme, hostname, and port (if required) of the authoritative Bluecat BAM server.
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// The REST endpoint will be appended. In addition, the Configuration name
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// and external DNS View Name must be passed in BLUECAT_CONFIG_NAME and BLUECAT_DNS_VIEW
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get("BLUECAT_SERVER_URL", "BLUECAT_USER_NAME", "BLUECAT_PASSWORD", "BLUECAT_CONFIG_NAME", "BLUECAT_DNS_VIEW")
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if err != nil {
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return nil, fmt.Errorf("bluecat: %v", err)
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}
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config := NewDefaultConfig()
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config.BaseURL = values["BLUECAT_SERVER_URL"]
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config.UserName = values["BLUECAT_USER_NAME"]
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config.Password = values["BLUECAT_PASSWORD"]
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config.ConfigName = values["BLUECAT_CONFIG_NAME"]
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config.DNSView = values["BLUECAT_DNS_VIEW"]
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderCredentials uses the supplied credentials
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// to return a DNSProvider instance configured for Bluecat DNS.
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// Deprecated
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func NewDNSProviderCredentials(baseURL, userName, password, configName, dnsView string, httpClient *http.Client) (*DNSProvider, error) {
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config := NewDefaultConfig()
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config.BaseURL = baseURL
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config.UserName = userName
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config.Password = password
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config.ConfigName = configName
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config.DNSView = dnsView
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if httpClient != nil {
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config.HTTPClient = httpClient
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}
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for Bluecat DNS.
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func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
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if config == nil {
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return nil, errors.New("bluecat: the configuration of the DNS provider is nil")
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}
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if config.BaseURL == "" || config.UserName == "" || config.Password == "" || config.ConfigName == "" || config.DNSView == "" {
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return nil, fmt.Errorf("bluecat: credentials missing")
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}
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return &DNSProvider{config: config}, nil
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}
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// Present creates a TXT record using the specified parameters
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// This will *not* create a subzone to contain the TXT record,
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// so make sure the FQDN specified is within an extant zone.
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func (d *DNSProvider) Present(domain, token, keyAuth string) error {
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fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
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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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viewID, err := d.lookupViewID(d.config.DNSView)
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if err != nil {
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return err
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}
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parentZoneID, name, err := d.lookupParentZoneID(viewID, fqdn)
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if err != nil {
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return err
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}
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queryArgs := map[string]string{
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"parentId": strconv.FormatUint(uint64(parentZoneID), 10),
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}
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body := bluecatEntity{
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Name: name,
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Type: "TXTRecord",
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Properties: fmt.Sprintf("ttl=%d|absoluteName=%s|txt=%s|", d.config.TTL, fqdn, value),
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}
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resp, err := d.sendRequest(http.MethodPost, "addEntity", body, queryArgs)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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addTxtBytes, _ := ioutil.ReadAll(resp.Body)
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addTxtResp := string(addTxtBytes)
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// addEntity responds only with body text containing the ID of the created record
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_, err = strconv.ParseUint(addTxtResp, 10, 64)
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if err != nil {
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return fmt.Errorf("bluecat: addEntity request failed: %s", addTxtResp)
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}
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err = d.deploy(parentZoneID)
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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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// 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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err := d.login()
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if err != nil {
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return err
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}
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viewID, err := d.lookupViewID(d.config.DNSView)
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if err != nil {
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return err
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}
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parentID, name, err := d.lookupParentZoneID(viewID, fqdn)
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if err != nil {
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return err
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}
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queryArgs := map[string]string{
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"parentId": strconv.FormatUint(uint64(parentID), 10),
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"name": name,
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"type": txtType,
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}
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resp, err := d.sendRequest(http.MethodGet, "getEntityByName", nil, queryArgs)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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var txtRec entityResponse
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err = json.NewDecoder(resp.Body).Decode(&txtRec)
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if err != nil {
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return fmt.Errorf("bluecat: %v", err)
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}
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queryArgs = map[string]string{
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"objectId": strconv.FormatUint(uint64(txtRec.ID), 10),
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}
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resp, err = d.sendRequest(http.MethodDelete, http.MethodDelete, nil, queryArgs)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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err = d.deploy(parentID)
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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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// Timeout returns the timeout and interval to use when checking for DNS propagation.
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// Adjusting here to cope with spikes in propagation times.
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func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
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return d.config.PropagationTimeout, d.config.PollingInterval
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}
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// Send a REST request, using query parameters specified. The Authorization
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// header will be set if we have an active auth token
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func (d *DNSProvider) sendRequest(method, resource string, payload interface{}, queryArgs map[string]string) (*http.Response, error) {
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url := fmt.Sprintf("%s/Services/REST/v1/%s", d.config.BaseURL, resource)
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body, err := json.Marshal(payload)
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if err != nil {
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return nil, fmt.Errorf("bluecat: %v", 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, fmt.Errorf("bluecat: %v", 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("Authorization", d.token)
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}
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// Add all query parameters
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q := req.URL.Query()
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for argName, argVal := range queryArgs {
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q.Add(argName, argVal)
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}
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req.URL.RawQuery = q.Encode()
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resp, err := d.config.HTTPClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("bluecat: %v", err)
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}
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if resp.StatusCode >= 400 {
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errBytes, _ := ioutil.ReadAll(resp.Body)
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errResp := string(errBytes)
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return nil, fmt.Errorf("bluecat: request failed with HTTP status code %d\n Full message: %s",
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resp.StatusCode, errResp)
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}
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return resp, nil
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}
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// Starts a new Bluecat 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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queryArgs := map[string]string{
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"username": d.config.UserName,
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"password": d.config.Password,
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}
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resp, err := d.sendRequest(http.MethodGet, "login", nil, queryArgs)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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authBytes, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return fmt.Errorf("bluecat: %v", err)
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}
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authResp := string(authBytes)
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if strings.Contains(authResp, "Authentication Error") {
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msg := strings.Trim(authResp, "\"")
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return fmt.Errorf("bluecat: request failed: %s", msg)
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}
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// Upon success, API responds with "Session Token-> BAMAuthToken: dQfuRMTUxNjc3MjcyNDg1ODppcGFybXM= <- for User : username"
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d.token = regexp.MustCompile("BAMAuthToken: [^ ]+").FindString(authResp)
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return nil
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}
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// Destroys Bluecat 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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resp, err := d.sendRequest(http.MethodGet, "logout", nil, nil)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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return fmt.Errorf("bluecat: request failed to delete session with HTTP status code %d", resp.StatusCode)
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}
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authBytes, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return err
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}
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authResp := string(authBytes)
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if !strings.Contains(authResp, "successfully") {
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msg := strings.Trim(authResp, "\"")
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return fmt.Errorf("bluecat: request failed to delete session: %s", msg)
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}
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d.token = ""
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return nil
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}
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// Lookup the entity ID of the configuration named in our properties
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func (d *DNSProvider) lookupConfID() (uint, error) {
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queryArgs := map[string]string{
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"parentId": strconv.Itoa(0),
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"name": d.config.ConfigName,
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"type": configType,
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}
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resp, err := d.sendRequest(http.MethodGet, "getEntityByName", nil, queryArgs)
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if err != nil {
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return 0, err
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}
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defer resp.Body.Close()
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var conf entityResponse
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err = json.NewDecoder(resp.Body).Decode(&conf)
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if err != nil {
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return 0, fmt.Errorf("bluecat: %v", err)
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}
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return conf.ID, nil
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}
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// Find the DNS view with the given name within
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func (d *DNSProvider) lookupViewID(viewName string) (uint, error) {
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confID, err := d.lookupConfID()
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if err != nil {
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return 0, err
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}
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queryArgs := map[string]string{
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"parentId": strconv.FormatUint(uint64(confID), 10),
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"name": viewName,
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"type": viewType,
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}
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resp, err := d.sendRequest(http.MethodGet, "getEntityByName", nil, queryArgs)
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if err != nil {
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return 0, err
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}
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defer resp.Body.Close()
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var view entityResponse
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err = json.NewDecoder(resp.Body).Decode(&view)
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if err != nil {
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return 0, fmt.Errorf("bluecat: %v", err)
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}
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return view.ID, nil
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}
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// Return the entityId of the parent zone by recursing from the root view
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// Also return the simple name of the host
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func (d *DNSProvider) lookupParentZoneID(viewID uint, fqdn string) (uint, string, error) {
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parentViewID := viewID
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name := ""
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if fqdn != "" {
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zones := strings.Split(strings.Trim(fqdn, "."), ".")
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last := len(zones) - 1
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name = zones[0]
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for i := last; i > -1; i-- {
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zoneID, err := d.getZone(parentViewID, zones[i])
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if err != nil || zoneID == 0 {
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return parentViewID, name, err
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}
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if i > 0 {
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name = strings.Join(zones[0:i], ".")
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}
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parentViewID = zoneID
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}
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}
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return parentViewID, name, nil
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}
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// Get the DNS zone with the specified name under the parentId
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func (d *DNSProvider) getZone(parentID uint, name string) (uint, error) {
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queryArgs := map[string]string{
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"parentId": strconv.FormatUint(uint64(parentID), 10),
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"name": name,
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"type": zoneType,
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}
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resp, err := d.sendRequest(http.MethodGet, "getEntityByName", nil, queryArgs)
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// Return an empty zone if the named zone doesn't exist
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if resp != nil && resp.StatusCode == 404 {
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return 0, fmt.Errorf("bluecat: could not find zone named %s", name)
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}
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if err != nil {
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return 0, err
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}
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defer resp.Body.Close()
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var zone entityResponse
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err = json.NewDecoder(resp.Body).Decode(&zone)
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if err != nil {
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return 0, fmt.Errorf("bluecat: %v", err)
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}
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return zone.ID, nil
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}
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// Deploy the DNS config for the specified entity to the authoritative servers
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func (d *DNSProvider) deploy(entityID uint) error {
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queryArgs := map[string]string{
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"entityId": strconv.FormatUint(uint64(entityID), 10),
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}
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resp, err := d.sendRequest(http.MethodPost, "quickDeploy", nil, queryArgs)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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return nil
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}
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