mirror of https://github.com/caddyserver/caddy.git
250 lines
6.9 KiB
Go
250 lines
6.9 KiB
Go
// Copyright 2020 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddypki
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"strings"
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"github.com/caddyserver/caddy/v2"
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"go.uber.org/zap"
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)
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func init() {
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caddy.RegisterModule(adminAPI{})
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}
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// adminAPI is a module that serves PKI endpoints to retrieve
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// information about the CAs being managed by Caddy.
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type adminAPI struct {
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ctx caddy.Context
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log *zap.Logger
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pkiApp *PKI
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}
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// CaddyModule returns the Caddy module information.
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func (adminAPI) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "admin.api.pki",
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New: func() caddy.Module { return new(adminAPI) },
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}
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}
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// Provision sets up the adminAPI module.
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func (a *adminAPI) Provision(ctx caddy.Context) error {
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a.ctx = ctx
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a.log = ctx.Logger(a) // TODO: passing in 'a' is a hack until the admin API is officially extensible (see #5032)
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// Avoid initializing PKI if it wasn't configured
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pkiApp, err := a.ctx.AppIfConfigured("pki")
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if err != nil {
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return err
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}
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if pkiApp != nil {
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a.pkiApp = pkiApp.(*PKI)
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}
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return nil
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}
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// Routes returns the admin routes for the PKI app.
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func (a *adminAPI) Routes() []caddy.AdminRoute {
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return []caddy.AdminRoute{
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{
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Pattern: adminPKIEndpointBase,
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Handler: caddy.AdminHandlerFunc(a.handleAPIEndpoints),
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},
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}
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}
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// handleAPIEndpoints routes API requests within adminPKIEndpointBase.
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func (a *adminAPI) handleAPIEndpoints(w http.ResponseWriter, r *http.Request) error {
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uri := strings.TrimPrefix(r.URL.Path, "/pki/")
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parts := strings.Split(uri, "/")
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switch {
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case len(parts) == 2 && parts[0] == "ca" && parts[1] != "":
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return a.handleCAInfo(w, r)
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case len(parts) == 3 && parts[0] == "ca" && parts[1] != "" && parts[2] == "certificates":
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return a.handleCACerts(w, r)
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}
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return caddy.APIError{
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HTTPStatus: http.StatusNotFound,
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Err: fmt.Errorf("resource not found: %v", r.URL.Path),
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}
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}
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// handleCAInfo returns information about a particular
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// CA by its ID. If the CA ID is the default, then the CA will be
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// provisioned if it has not already been. Other CA IDs will return an
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// error if they have not been previously provisioned.
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func (a *adminAPI) handleCAInfo(w http.ResponseWriter, r *http.Request) error {
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if r.Method != http.MethodGet {
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return caddy.APIError{
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HTTPStatus: http.StatusMethodNotAllowed,
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Err: fmt.Errorf("method not allowed: %v", r.Method),
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}
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}
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ca, err := a.getCAFromAPIRequestPath(r)
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if err != nil {
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return err
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}
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rootCert, interCert, err := rootAndIntermediatePEM(ca)
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if err != nil {
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return caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: fmt.Errorf("failed to get root and intermediate cert for CA %s: %v", ca.ID, err),
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}
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}
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repl := ca.newReplacer()
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response := caInfo{
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ID: ca.ID,
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Name: ca.Name,
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RootCN: repl.ReplaceAll(ca.RootCommonName, ""),
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IntermediateCN: repl.ReplaceAll(ca.IntermediateCommonName, ""),
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RootCert: string(rootCert),
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IntermediateCert: string(interCert),
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}
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encoded, err := json.Marshal(response)
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if err != nil {
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return caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: err,
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}
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}
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w.Header().Set("Content-Type", "application/json")
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_, _ = w.Write(encoded)
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return nil
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}
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// handleCACerts returns the certificate chain for a particular
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// CA by its ID. If the CA ID is the default, then the CA will be
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// provisioned if it has not already been. Other CA IDs will return an
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// error if they have not been previously provisioned.
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func (a *adminAPI) handleCACerts(w http.ResponseWriter, r *http.Request) error {
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if r.Method != http.MethodGet {
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return caddy.APIError{
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HTTPStatus: http.StatusMethodNotAllowed,
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Err: fmt.Errorf("method not allowed: %v", r.Method),
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}
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}
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ca, err := a.getCAFromAPIRequestPath(r)
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if err != nil {
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return err
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}
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rootCert, interCert, err := rootAndIntermediatePEM(ca)
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if err != nil {
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return caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: fmt.Errorf("failed to get root and intermediate cert for CA %s: %v", ca.ID, err),
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}
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}
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w.Header().Set("Content-Type", "application/pem-certificate-chain")
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_, err = w.Write(interCert)
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if err == nil {
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_, _ = w.Write(rootCert)
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}
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return nil
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}
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func (a *adminAPI) getCAFromAPIRequestPath(r *http.Request) (*CA, error) {
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// Grab the CA ID from the request path, it should be the 4th segment (/pki/ca/<ca>)
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id := strings.Split(r.URL.Path, "/")[3]
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if id == "" {
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return nil, caddy.APIError{
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HTTPStatus: http.StatusBadRequest,
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Err: fmt.Errorf("missing CA in path"),
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}
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}
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// Find the CA by ID, if PKI is configured
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var ca *CA
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var ok bool
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if a.pkiApp != nil {
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ca, ok = a.pkiApp.CAs[id]
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}
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// If we didn't find the CA, and PKI is not configured
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// then we'll either error out if the CA ID is not the
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// default. If the CA ID is the default, then we'll
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// provision it, because the user probably aims to
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// change their config to enable PKI immediately after
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// if they actually requested the local CA ID.
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if !ok {
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if id != DefaultCAID {
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return nil, caddy.APIError{
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HTTPStatus: http.StatusNotFound,
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Err: fmt.Errorf("no certificate authority configured with id: %s", id),
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}
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}
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// Provision the default CA, which generates and stores a root
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// certificate in storage, if one doesn't already exist.
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ca = new(CA)
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err := ca.Provision(a.ctx, id, a.log)
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if err != nil {
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return nil, caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: fmt.Errorf("failed to provision CA %s, %w", id, err),
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}
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}
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}
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return ca, nil
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}
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func rootAndIntermediatePEM(ca *CA) (root, inter []byte, err error) {
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root, err = pemEncodeCert(ca.RootCertificate().Raw)
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if err != nil {
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return
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}
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inter, err = pemEncodeCert(ca.IntermediateCertificate().Raw)
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if err != nil {
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return
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}
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return
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}
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// caInfo is the response structure for the CA info API endpoint.
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type caInfo struct {
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ID string `json:"id"`
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Name string `json:"name"`
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RootCN string `json:"root_common_name"`
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IntermediateCN string `json:"intermediate_common_name"`
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RootCert string `json:"root_certificate"`
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IntermediateCert string `json:"intermediate_certificate"`
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}
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// adminPKIEndpointBase is the base admin endpoint under which all PKI admin endpoints exist.
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const adminPKIEndpointBase = "/pki/"
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// Interface guards
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var (
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_ caddy.AdminRouter = (*adminAPI)(nil)
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_ caddy.Provisioner = (*adminAPI)(nil)
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)
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