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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 caddytls
import (
"crypto/x509"
"encoding/pem"
"fmt"
"os"
"github.com/caddyserver/caddy/v2"
)
func init() {
caddy.RegisterModule(LeafFileLoader{})
}
// LeafFileLoader loads leaf certificates from disk.
type LeafFileLoader struct {
Files []string `json:"files,omitempty"`
}
// Provision implements caddy.Provisioner.
func (fl *LeafFileLoader) Provision(ctx caddy.Context) error {
repl, ok := ctx.Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
if !ok {
repl = caddy.NewReplacer()
}
for k, path := range fl.Files {
fl.Files[k] = repl.ReplaceKnown(path, "")
}
return nil
}
// CaddyModule returns the Caddy module information.
func (LeafFileLoader) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "tls.leaf_cert_loader.file",
New: func() caddy.Module { return new(LeafFileLoader) },
}
}
// LoadLeafCertificates returns the certificates to be loaded by fl.
func (fl LeafFileLoader) LoadLeafCertificates() ([]*x509.Certificate, error) {
certificates := make([]*x509.Certificate, 0, len(fl.Files))
for _, path := range fl.Files {
ders, err := convertPEMFilesToDERBytes(path)
if err != nil {
return nil, err
}
certs, err := x509.ParseCertificates(ders)
if err != nil {
return nil, err
}
certificates = append(certificates, certs...)
}
return certificates, nil
}
func convertPEMFilesToDERBytes(filename string) ([]byte, error) {
certDataPEM, err := os.ReadFile(filename)
if err != nil {
return nil, err
}
var ders []byte
// while block is not nil, we have more certificates in the file
for block, rest := pem.Decode(certDataPEM); block != nil; block, rest = pem.Decode(rest) {
if block.Type != "CERTIFICATE" {
return nil, fmt.Errorf("no CERTIFICATE pem block found in %s", filename)
}
ders = append(
ders,
block.Bytes...,
)
}
// if we decoded nothing, return an error
if len(ders) == 0 {
return nil, fmt.Errorf("no CERTIFICATE pem block found in %s", filename)
}
return ders, nil
}
// Interface guard
var (
_ LeafCertificateLoader = (*LeafFileLoader)(nil)
_ caddy.Provisioner = (*LeafFileLoader)(nil)
)
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