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webhook.go
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webhook.go
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package api
import (
"encoding/base64"
"fmt"
"net/http"
"net/url"
"github.com/go-chi/chi"
"github.com/smallstep/certificates/api/read"
"github.com/smallstep/certificates/api/render"
"github.com/smallstep/certificates/authority/admin"
"go.step.sm/crypto/randutil"
"go.step.sm/linkedca"
)
// WebhookAdminResponder is the interface responsible for writing webhook admin
// responses.
type WebhookAdminResponder interface {
CreateProvisionerWebhook(w http.ResponseWriter, r *http.Request)
UpdateProvisionerWebhook(w http.ResponseWriter, r *http.Request)
DeleteProvisionerWebhook(w http.ResponseWriter, r *http.Request)
}
// webhoookAdminResponder implements WebhookAdminResponder
type webhookAdminResponder struct{}
// NewWebhookAdminResponder returns a new WebhookAdminResponder
func NewWebhookAdminResponder() WebhookAdminResponder {
return &webhookAdminResponder{}
}
func validateWebhook(webhook *linkedca.Webhook) error {
if webhook == nil {
return nil
}
// name
if webhook.Name == "" {
return admin.NewError(admin.ErrorBadRequestType, "webhook name is required")
}
// url
parsedURL, err := url.Parse(webhook.Url)
if err != nil {
return admin.NewError(admin.ErrorBadRequestType, "webhook url is invalid")
}
if parsedURL.Host == "" {
return admin.NewError(admin.ErrorBadRequestType, "webhook url is invalid")
}
if parsedURL.Scheme != "https" {
return admin.NewError(admin.ErrorBadRequestType, "webhook url must use https")
}
if parsedURL.User != nil {
return admin.NewError(admin.ErrorBadRequestType, "webhook url may not contain username or password")
}
// kind
switch webhook.Kind {
case linkedca.Webhook_ENRICHING, linkedca.Webhook_AUTHORIZING:
default:
return admin.NewError(admin.ErrorBadRequestType, "webhook kind is invalid")
}
return nil
}
func (war *webhookAdminResponder) CreateProvisionerWebhook(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
auth := mustAuthority(ctx)
prov := linkedca.MustProvisionerFromContext(ctx)
var newWebhook = new(linkedca.Webhook)
if err := read.ProtoJSON(r.Body, newWebhook); err != nil {
render.Error(w, err)
return
}
if err := validateWebhook(newWebhook); err != nil {
render.Error(w, err)
return
}
if newWebhook.Secret != "" {
err := admin.NewError(admin.ErrorBadRequestType, "webhook secret must not be set")
render.Error(w, err)
return
}
if newWebhook.Id != "" {
err := admin.NewError(admin.ErrorBadRequestType, "webhook ID must not be set")
render.Error(w, err)
return
}
id, err := randutil.UUIDv4()
if err != nil {
render.Error(w, admin.WrapErrorISE(err, "error generating webhook id"))
return
}
newWebhook.Id = id
// verify the name is unique
for _, wh := range prov.Webhooks {
if wh.Name == newWebhook.Name {
err := admin.NewError(admin.ErrorConflictType, "provisioner %q already has a webhook with the name %q", prov.Name, newWebhook.Name)
render.Error(w, err)
return
}
}
secret, err := randutil.Bytes(64)
if err != nil {
render.Error(w, admin.WrapErrorISE(err, "error generating webhook secret"))
return
}
newWebhook.Secret = base64.StdEncoding.EncodeToString(secret)
prov.Webhooks = append(prov.Webhooks, newWebhook)
if err := auth.UpdateProvisioner(ctx, prov); err != nil {
if isBadRequest(err) {
render.Error(w, admin.WrapError(admin.ErrorBadRequestType, err, "error creating provisioner webhook"))
return
}
render.Error(w, admin.WrapErrorISE(err, "error creating provisioner webhook"))
return
}
render.ProtoJSONStatus(w, newWebhook, http.StatusCreated)
}
func (war *webhookAdminResponder) DeleteProvisionerWebhook(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
auth := mustAuthority(ctx)
prov := linkedca.MustProvisionerFromContext(ctx)
webhookName := chi.URLParam(r, "webhookName")
found := false
for i, wh := range prov.Webhooks {
if wh.Name == webhookName {
prov.Webhooks = append(prov.Webhooks[0:i], prov.Webhooks[i+1:]...)
found = true
break
}
}
if !found {
render.JSONStatus(w, DeleteResponse{Status: "ok"}, http.StatusOK)
return
}
if err := auth.UpdateProvisioner(ctx, prov); err != nil {
if isBadRequest(err) {
render.Error(w, admin.WrapError(admin.ErrorBadRequestType, err, "error deleting provisioner webhook"))
return
}
render.Error(w, admin.WrapErrorISE(err, "error deleting provisioner webhook"))
return
}
render.JSONStatus(w, DeleteResponse{Status: "ok"}, http.StatusOK)
}
func (war *webhookAdminResponder) UpdateProvisionerWebhook(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
auth := mustAuthority(ctx)
prov := linkedca.MustProvisionerFromContext(ctx)
var newWebhook = new(linkedca.Webhook)
if err := read.ProtoJSON(r.Body, newWebhook); err != nil {
render.Error(w, err)
return
}
if err := validateWebhook(newWebhook); err != nil {
render.Error(w, err)
return
}
found := false
for i, wh := range prov.Webhooks {
if wh.Name != newWebhook.Name {
continue
}
if newWebhook.Secret != "" && newWebhook.Secret != wh.Secret {
err := admin.NewError(admin.ErrorBadRequestType, "webhook secret cannot be updated")
render.Error(w, err)
return
}
newWebhook.Secret = wh.Secret
if newWebhook.Id != "" && newWebhook.Id != wh.Id {
err := admin.NewError(admin.ErrorBadRequestType, "webhook ID cannot be updated")
render.Error(w, err)
return
}
newWebhook.Id = wh.Id
prov.Webhooks[i] = newWebhook
found = true
break
}
if !found {
msg := fmt.Sprintf("provisioner %q has no webhook with the name %q", prov.Name, newWebhook.Name)
err := admin.NewError(admin.ErrorNotFoundType, msg)
render.Error(w, err)
return
}
if err := auth.UpdateProvisioner(ctx, prov); err != nil {
if isBadRequest(err) {
render.Error(w, admin.WrapError(admin.ErrorBadRequestType, err, "error updating provisioner webhook"))
return
}
render.Error(w, admin.WrapErrorISE(err, "error updating provisioner webhook"))
return
}
// Return a copy without the signing secret. Include the client-supplied
// auth secrets since those may have been updated in this request and we
// should show in the response that they changed
whResponse := &linkedca.Webhook{
Id: newWebhook.Id,
Name: newWebhook.Name,
Url: newWebhook.Url,
Kind: newWebhook.Kind,
CertType: newWebhook.CertType,
Auth: newWebhook.Auth,
DisableTlsClientAuth: newWebhook.DisableTlsClientAuth,
}
render.ProtoJSONStatus(w, whResponse, http.StatusCreated)
}