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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/tls"
"fmt"
"os"
"strings"
"github.com/caddyserver/caddy/v2"
)
func init() {
caddy.RegisterModule(FileLoader{})
}
// FileLoader loads certificates and their associated keys from disk.
type FileLoader []CertKeyFilePair
// Provision implements caddy.Provisioner.
func (fl FileLoader) Provision(ctx caddy.Context) error {
repl, ok := ctx.Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
if !ok {
repl = caddy.NewReplacer()
}
for k, pair := range fl {
for i, tag := range pair.Tags {
pair.Tags[i] = repl.ReplaceKnown(tag, "")
}
fl[k] = CertKeyFilePair{
Certificate: repl.ReplaceKnown(pair.Certificate, ""),
Key: repl.ReplaceKnown(pair.Key, ""),
Format: repl.ReplaceKnown(pair.Format, ""),
Tags: pair.Tags,
}
}
return nil
}
// CaddyModule returns the Caddy module information.
func (FileLoader) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "tls.certificates.load_files",
New: func() caddy.Module { return new(FileLoader) },
}
}
// CertKeyFilePair pairs certificate and key file names along with their
// encoding format so that they can be loaded from disk.
type CertKeyFilePair struct {
// Path to the certificate (public key) file.
Certificate string `json:"certificate"`
// Path to the private key file.
Key string `json:"key"`
// The format of the cert and key. Can be "pem". Default: "pem"
Format string `json:"format,omitempty"`
// Arbitrary values to associate with this certificate.
// Can be useful when you want to select a particular
// certificate when there may be multiple valid candidates.
Tags []string `json:"tags,omitempty"`
}
// LoadCertificates returns the certificates to be loaded by fl.
func (fl FileLoader) LoadCertificates() ([]Certificate, error) {
certs := make([]Certificate, 0, len(fl))
for _, pair := range fl {
certData, err := os.ReadFile(pair.Certificate)
if err != nil {
return nil, err
}
keyData, err := os.ReadFile(pair.Key)
if err != nil {
return nil, err
}
var cert tls.Certificate
switch pair.Format {
case "":
fallthrough
case "pem":
// if the start of the key file looks like an encrypted private key,
// reject it with a helpful error message
if strings.Contains(string(keyData[:40]), "ENCRYPTED") {
return nil, fmt.Errorf("encrypted private keys are not supported; please decrypt the key first")
}
cert, err = tls.X509KeyPair(certData, keyData)
default:
return nil, fmt.Errorf("unrecognized certificate/key encoding format: %s", pair.Format)
}
if err != nil {
return nil, err
}
certs = append(certs, Certificate{Certificate: cert, Tags: pair.Tags})
}
return certs, nil
}
// Interface guard
var (
_ CertificateLoader = (FileLoader)(nil)
_ caddy.Provisioner = (FileLoader)(nil)
)
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