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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package acmeserver
import (
"fmt"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/caddyserver/caddy/v2/modules/caddypki"
"github.com/go-chi/chi"
"github.com/smallstep/certificates/acme"
acmeAPI "github.com/smallstep/certificates/acme/api"
"github.com/smallstep/certificates/authority"
"github.com/smallstep/certificates/authority/provisioner"
"github.com/smallstep/certificates/db"
"github.com/smallstep/nosql"
)
func init() {
caddy.RegisterModule(Handler{})
}
// Handler is an ACME server handler.
type Handler struct {
// The ID of the CA to use for signing. This refers to
// the ID given to the CA in the `pki` app. If omitted,
// the default ID is "local".
CA string `json:"ca,omitempty"`
// The hostname or IP address by which ACME clients
// will access the server. This is used to populate
// the ACME directory endpoint. Default: localhost.
// COMPATIBILITY NOTE / TODO: This property may go away in the
// future, as it is currently only required due to
// limitations in the underlying library. Do not rely
// on this property long-term; check release notes.
Host string `json:"host,omitempty"`
// The path prefix under which to serve all ACME
// endpoints. All other requests will not be served
// by this handler and will be passed through to
// the next one. Default: "/acme/"
// COMPATIBILITY NOTE / TODO: This property may go away in the
// future, as it is currently only required due to
// limitations in the underlying library. Do not rely
// on this property long-term; check release notes.
PathPrefix string `json:"path_prefix,omitempty"`
acmeEndpoints http.Handler
}
// CaddyModule returns the Caddy module information.
func (Handler) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "http.handlers.acme_server",
New: func() caddy.Module { return new(Handler) },
}
}
// Provision sets up the ACME server handler.
func (ash *Handler) Provision(ctx caddy.Context) error {
// set some defaults
if ash.CA == "" {
ash.CA = caddypki.DefaultCAID
}
if ash.Host == "" {
ash.Host = defaultHost
}
if ash.PathPrefix == "" {
ash.PathPrefix = defaultPathPrefix
}
// get a reference to the configured CA
appModule, err := ctx.App("pki")
if err != nil {
return err
}
pkiApp := appModule.(*caddypki.PKI)
ca, ok := pkiApp.CAs[ash.CA]
if !ok {
return fmt.Errorf("no certificate authority configured with id: %s", ash.CA)
}
dbFolder := filepath.Join(caddy.AppDataDir(), "acme_server", "db")
// TODO: See https://github.com/smallstep/nosql/issues/7
err = os.MkdirAll(dbFolder, 0755)
if err != nil {
return fmt.Errorf("making folder for ACME server database: %v", err)
}
authorityConfig := caddypki.AuthorityConfig{
AuthConfig: &authority.AuthConfig{
Provisioners: provisioner.List{
&provisioner.ACME{
Name: ash.CA,
Type: provisioner.TypeACME.String(),
Claims: &provisioner.Claims{
MinTLSDur: &provisioner.Duration{Duration: 5 * time.Minute},
MaxTLSDur: &provisioner.Duration{Duration: 24 * time.Hour * 365},
DefaultTLSDur: &provisioner.Duration{Duration: 12 * time.Hour},
},
},
},
},
DB: &db.Config{
Type: "badger",
DataSource: dbFolder,
},
}
auth, err := ca.NewAuthority(authorityConfig)
if err != nil {
return err
}
acmeAuth, err := acme.New(auth, acme.AuthorityOptions{
DB: auth.GetDatabase().(nosql.DB), // stores all the server state
DNS: ash.Host, // used for directory links; TODO: not needed
Prefix: strings.Trim(ash.PathPrefix, "/"), // used for directory links
})
if err != nil {
return err
}
// create the router for the ACME endpoints
acmeRouterHandler := acmeAPI.New(acmeAuth)
r := chi.NewRouter()
r.Route(ash.PathPrefix, func(r chi.Router) {
acmeRouterHandler.Route(r)
})
ash.acmeEndpoints = r
return nil
}
func (ash Handler) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
if strings.HasPrefix(r.URL.Path, ash.PathPrefix) {
ash.acmeEndpoints.ServeHTTP(w, r)
return nil
}
return next.ServeHTTP(w, r)
}
const (
defaultHost = "localhost"
defaultPathPrefix = "/acme/"
)
// Interface guards
var (
_ caddyhttp.MiddlewareHandler = (*Handler)(nil)
_ caddy.Provisioner = (*Handler)(nil)
)
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