2020-03-13 12:06:08 -05:00
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// Copyright 2015 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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"bytes"
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"crypto"
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"crypto/ecdsa"
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"crypto/ed25519"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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2021-09-29 12:17:48 -05:00
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"os"
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2020-03-13 12:06:08 -05:00
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"strings"
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)
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func pemDecodeSingleCert(pemDER []byte) (*x509.Certificate, error) {
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pemBlock, remaining := pem.Decode(pemDER)
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if pemBlock == nil {
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return nil, fmt.Errorf("no PEM block found")
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}
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if len(remaining) > 0 {
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return nil, fmt.Errorf("input contained more than a single PEM block")
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}
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if pemBlock.Type != "CERTIFICATE" {
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return nil, fmt.Errorf("expected PEM block type to be CERTIFICATE, but got '%s'", pemBlock.Type)
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}
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return x509.ParseCertificate(pemBlock.Bytes)
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}
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func pemEncodeCert(der []byte) ([]byte, error) {
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return pemEncode("CERTIFICATE", der)
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}
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// pemEncodePrivateKey marshals a EC or RSA private key into a PEM-encoded array of bytes.
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// TODO: this is the same thing as in certmagic. Should we reuse that code somehow? It's unexported.
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func pemEncodePrivateKey(key crypto.PrivateKey) ([]byte, error) {
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var pemType string
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var keyBytes []byte
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switch key := key.(type) {
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case *ecdsa.PrivateKey:
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var err error
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pemType = "EC"
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keyBytes, err = x509.MarshalECPrivateKey(key)
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if err != nil {
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return nil, err
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}
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case *rsa.PrivateKey:
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pemType = "RSA"
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keyBytes = x509.MarshalPKCS1PrivateKey(key)
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case *ed25519.PrivateKey:
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var err error
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pemType = "ED25519"
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keyBytes, err = x509.MarshalPKCS8PrivateKey(key)
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("unsupported key type: %T", key)
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}
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return pemEncode(pemType+" PRIVATE KEY", keyBytes)
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}
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// pemDecodePrivateKey loads a PEM-encoded ECC/RSA private key from an array of bytes.
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// Borrowed from Go standard library, to handle various private key and PEM block types.
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// https://github.com/golang/go/blob/693748e9fa385f1e2c3b91ca9acbb6c0ad2d133d/src/crypto/tls/tls.go#L291-L308
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// https://github.com/golang/go/blob/693748e9fa385f1e2c3b91ca9acbb6c0ad2d133d/src/crypto/tls/tls.go#L238)
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// TODO: this is the same thing as in certmagic. Should we reuse that code somehow? It's unexported.
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func pemDecodePrivateKey(keyPEMBytes []byte) (crypto.PrivateKey, error) {
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keyBlockDER, _ := pem.Decode(keyPEMBytes)
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if keyBlockDER.Type != "PRIVATE KEY" && !strings.HasSuffix(keyBlockDER.Type, " PRIVATE KEY") {
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return nil, fmt.Errorf("unknown PEM header %q", keyBlockDER.Type)
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}
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if key, err := x509.ParsePKCS1PrivateKey(keyBlockDER.Bytes); err == nil {
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return key, nil
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}
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if key, err := x509.ParsePKCS8PrivateKey(keyBlockDER.Bytes); err == nil {
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switch key := key.(type) {
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case *rsa.PrivateKey, *ecdsa.PrivateKey, ed25519.PrivateKey:
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return key, nil
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default:
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return nil, fmt.Errorf("found unknown private key type in PKCS#8 wrapping: %T", key)
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}
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}
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if key, err := x509.ParseECPrivateKey(keyBlockDER.Bytes); err == nil {
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return key, nil
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}
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return nil, fmt.Errorf("unknown private key type")
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}
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func pemEncode(blockType string, b []byte) ([]byte, error) {
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var buf bytes.Buffer
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err := pem.Encode(&buf, &pem.Block{Type: blockType, Bytes: b})
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return buf.Bytes(), err
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}
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func trusted(cert *x509.Certificate) bool {
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chains, err := cert.Verify(x509.VerifyOptions{})
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return len(chains) > 0 && err == nil
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}
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// KeyPair represents a public-private key pair, where the
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// public key is also called a certificate.
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type KeyPair struct {
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// The certificate. By default, this should be the path to
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// a PEM file unless format is something else.
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Certificate string `json:"certificate,omitempty"`
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// The private key. By default, this should be the path to
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// a PEM file unless format is something else.
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PrivateKey string `json:"private_key,omitempty"`
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// The format in which the certificate and private
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// key are provided. Default: pem_file
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Format string `json:"format,omitempty"`
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}
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// Load loads the certificate and key.
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func (kp KeyPair) Load() (*x509.Certificate, interface{}, error) {
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switch kp.Format {
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case "", "pem_file":
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certData, err := os.ReadFile(kp.Certificate)
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if err != nil {
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return nil, nil, err
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}
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keyData, err := os.ReadFile(kp.PrivateKey)
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if err != nil {
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return nil, nil, err
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}
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cert, err := pemDecodeSingleCert(certData)
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if err != nil {
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return nil, nil, err
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}
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key, err := pemDecodePrivateKey(keyData)
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if err != nil {
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return nil, nil, err
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}
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return cert, key, nil
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default:
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return nil, nil, fmt.Errorf("unsupported format: %s", kp.Format)
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}
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}
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