196 lines
6.8 KiB
Go
196 lines
6.8 KiB
Go
package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"os"
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"strings"
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extapi "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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"github.com/cert-manager/webhook-freedns/freedns"
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"github.com/jetstack/cert-manager/pkg/acme/webhook/apis/acme/v1alpha1"
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"github.com/jetstack/cert-manager/pkg/acme/webhook/cmd"
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)
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var GroupName = os.Getenv("GROUP_NAME")
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func main() {
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if GroupName == "" {
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panic("GROUP_NAME must be specified")
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}
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// This will register our custom DNS provider with the webhook serving
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// library, making it available as an API under the provided GroupName.
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// You can register multiple DNS provider implementations with a single
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// webhook, where the Name() method will be used to disambiguate between
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// the different implementations.
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cmd.RunWebhookServer(GroupName,
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&customDNSProviderSolver{},
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)
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}
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// customDNSProviderSolver implements the provider-specific logic needed to
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// 'present' an ACME challenge TXT record for your own DNS provider.
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// To do so, it must implement the `github.com/jetstack/cert-manager/pkg/acme/webhook.Solver`
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// interface.
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type customDNSProviderSolver struct {
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// If a Kubernetes 'clientset' is needed, you must:
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// 1. uncomment the additional `client` field in this structure below
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// 2. uncomment the "k8s.io/client-go/kubernetes" import at the top of the file
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// 3. uncomment the relevant code in the Initialize method below
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// 4. ensure your webhook's service account has the required RBAC role
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// assigned to it for interacting with the Kubernetes APIs you need.
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client *kubernetes.Clientset
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freedns *freedns.FreeDNS
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}
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// customDNSProviderConfig is a structure that is used to decode into when
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// solving a DNS01 challenge.
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// This information is provided by cert-manager, and may be a reference to
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// additional configuration that's needed to solve the challenge for this
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// particular certificate or issuer.
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// This typically includes references to Secret resources containing DNS
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// provider credentials, in cases where a 'multi-tenant' DNS solver is being
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// created.
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// If you do *not* require per-issuer or per-certificate configuration to be
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// provided to your webhook, you can skip decoding altogether in favour of
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// using CLI flags or similar to provide configuration.
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// You should not include sensitive information here. If credentials need to
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// be used by your provider here, you should reference a Kubernetes Secret
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// resource and fetch these credentials using a Kubernetes clientset.
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type customDNSProviderConfig struct {
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// Change the two fields below according to the format of the configuration
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// to be decoded.
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// These fields will be set by users in the
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// `issuer.spec.acme.dns01.providers.webhook.config` field.
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//Email string `json:"email"`
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SecretRef string `json:"secretName"`
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//APIKeySecretRef v1.SecretKeySelector `json:"apiKeySecretRef"`
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}
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// Name is used as the name for this DNS solver when referencing it on the ACME
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// Issuer resource.
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// This should be unique **within the group name**, i.e. you can have two
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// solvers configured with the same Name() **so long as they do not co-exist
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// within a single webhook deployment**.
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// For example, `cloudflare` may be used as the name of a solver.
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func (c *customDNSProviderSolver) Name() string {
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return "freedns-solver"
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}
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// Present is responsible for actually presenting the DNS record with the
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// DNS provider.
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// This method should tolerate being called multiple times with the same value.
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// cert-manager itself will later perform a self check to ensure that the
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// solver has correctly configured the DNS provider.
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func (c *customDNSProviderSolver) Present(ch *v1alpha1.ChallengeRequest) error {
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cfg, err := loadConfig(ch.Config)
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if err != nil {
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return err
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}
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secretName := cfg.SecretRef
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secretObj, err := c.client.CoreV1().Secrets(ch.ResourceNamespace).Get(context.Background(), secretName, metav1.GetOptions{})
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if err != nil {
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return fmt.Errorf("Unable to get secret `%s/%s`; %v", secretName, ch.ResourceNamespace, err)
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}
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username := string(secretObj.Data["username"])
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password := string(secretObj.Data["password"])
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dnsObj := freedns.FreeDNS{}
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err = dnsObj.Login(username, password)
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if err != nil {
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return err
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}
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domainName := freedns.GetDomainFromZone(ch.ResolvedZone)
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err = dnsObj.SelectDomain(domainName)
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if err != nil {
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return err
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}
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_zone := strings.TrimRight(ch.ResolvedFQDN, ".")
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_zone = strings.TrimSuffix(_zone, domainName)
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_zone = strings.TrimRight(_zone, ".")
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_key := "\"" + ch.Key + "\""
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fmt.Println("ADD", _zone, _key)
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err = dnsObj.AddRecord("TXT", _zone, _key, false, "")
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if err != nil {
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return err
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}
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c.freedns = &dnsObj
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return nil
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}
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// CleanUp should delete the relevant TXT record from the DNS provider console.
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// If multiple TXT records exist with the same record name (e.g.
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// _acme-challenge.example.com) then **only** the record with the same `key`
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// value provided on the ChallengeRequest should be cleaned up.
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// This is in order to facilitate multiple DNS validations for the same domain
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// concurrently.
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func (c *customDNSProviderSolver) CleanUp(ch *v1alpha1.ChallengeRequest) error {
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_addr := strings.TrimRight(ch.ResolvedFQDN, ".")
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_key := "\"" + ch.Key + "\""
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_id, err := c.freedns.FindRecord(_addr, "TXT", _key)
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fmt.Println("DEL", _addr)
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if _id != "" {
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err = c.freedns.DeleteRecord(_id)
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if err != nil {
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return err
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}
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}
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return c.freedns.Logout()
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}
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// Initialize will be called when the webhook first starts.
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// This method can be used to instantiate the webhook, i.e. initialising
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// connections or warming up caches.
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// Typically, the kubeClientConfig parameter is used to build a Kubernetes
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// client that can be used to fetch resources from the Kubernetes API, e.g.
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// Secret resources containing credentials used to authenticate with DNS
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// provider accounts.
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// The stopCh can be used to handle early termination of the webhook, in cases
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// where a SIGTERM or similar signal is sent to the webhook process.
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func (c *customDNSProviderSolver) Initialize(kubeClientConfig *rest.Config, stopCh <-chan struct{}) error {
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///// UNCOMMENT THE BELOW CODE TO MAKE A KUBERNETES CLIENTSET AVAILABLE TO
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///// YOUR CUSTOM DNS PROVIDER
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cl, err := kubernetes.NewForConfig(kubeClientConfig)
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if err != nil {
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return err
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}
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c.client = cl
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///// END OF CODE TO MAKE KUBERNETES CLIENTSET AVAILABLE
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return nil
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}
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// loadConfig is a small helper function that decodes JSON configuration into
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// the typed config struct.
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func loadConfig(cfgJSON *extapi.JSON) (customDNSProviderConfig, error) {
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cfg := customDNSProviderConfig{}
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// handle the 'base case' where no configuration has been provided
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if cfgJSON == nil {
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return cfg, nil
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}
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if err := json.Unmarshal(cfgJSON.Raw, &cfg); err != nil {
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return cfg, fmt.Errorf("error decoding solver config: %v", err)
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}
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return cfg, nil
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}
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