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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 caddypki
import (
"bytes"
"crypto"
"crypto/x509"
"encoding/pem"
"fmt"
"os"
"github.com/caddyserver/certmagic"
)
func pemDecodeSingleCert(pemDER []byte) (*x509.Certificate, error) {
pemBlock, remaining := pem.Decode(pemDER)
if pemBlock == nil {
return nil, fmt.Errorf("no PEM block found")
}
if len(remaining) > 0 {
return nil, fmt.Errorf("input contained more than a single PEM block")
}
if pemBlock.Type != "CERTIFICATE" {
return nil, fmt.Errorf("expected PEM block type to be CERTIFICATE, but got '%s'", pemBlock.Type)
}
return x509.ParseCertificate(pemBlock.Bytes)
}
func pemEncodeCert(der []byte) ([]byte, error) {
return pemEncode("CERTIFICATE", der)
}
func pemEncode(blockType string, b []byte) ([]byte, error) {
var buf bytes.Buffer
err := pem.Encode(&buf, &pem.Block{Type: blockType, Bytes: b})
return buf.Bytes(), err
}
func trusted(cert *x509.Certificate) bool {
chains, err := cert.Verify(x509.VerifyOptions{})
return len(chains) > 0 && err == nil
}
// KeyPair represents a public-private key pair, where the
// public key is also called a certificate.
type KeyPair struct {
// The certificate. By default, this should be the path to
// a PEM file unless format is something else.
Certificate string `json:"certificate,omitempty"`
// The private key. By default, this should be the path to
// a PEM file unless format is something else.
PrivateKey string `json:"private_key,omitempty"`
// The format in which the certificate and private
// key are provided. Default: pem_file
Format string `json:"format,omitempty"`
}
// Load loads the certificate and key.
func (kp KeyPair) Load() (*x509.Certificate, crypto.Signer, error) {
switch kp.Format {
case "", "pem_file":
certData, err := os.ReadFile(kp.Certificate)
if err != nil {
return nil, nil, err
}
keyData, err := os.ReadFile(kp.PrivateKey)
if err != nil {
return nil, nil, err
}
cert, err := pemDecodeSingleCert(certData)
if err != nil {
return nil, nil, err
}
key, err := certmagic.PEMDecodePrivateKey(keyData)
if err != nil {
return nil, nil, err
}
return cert, key, nil
default:
return nil, nil, fmt.Errorf("unsupported format: %s", kp.Format)
}
}
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