mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-05 04:30:23 +00:00
324 lines
9.6 KiB
Go
324 lines
9.6 KiB
Go
|
/*
|
||
|
Copyright 2018 The Kubernetes 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 keyutil contains utilities for managing public/private key pairs.
|
||
|
package keyutil
|
||
|
|
||
|
import (
|
||
|
"crypto"
|
||
|
"crypto/ecdsa"
|
||
|
"crypto/elliptic"
|
||
|
cryptorand "crypto/rand"
|
||
|
"crypto/rsa"
|
||
|
"crypto/x509"
|
||
|
"encoding/pem"
|
||
|
"fmt"
|
||
|
"io/ioutil"
|
||
|
"os"
|
||
|
"path/filepath"
|
||
|
)
|
||
|
|
||
|
const (
|
||
|
// ECPrivateKeyBlockType is a possible value for pem.Block.Type.
|
||
|
ECPrivateKeyBlockType = "EC PRIVATE KEY"
|
||
|
// RSAPrivateKeyBlockType is a possible value for pem.Block.Type.
|
||
|
RSAPrivateKeyBlockType = "RSA PRIVATE KEY"
|
||
|
// PrivateKeyBlockType is a possible value for pem.Block.Type.
|
||
|
PrivateKeyBlockType = "PRIVATE KEY"
|
||
|
// PublicKeyBlockType is a possible value for pem.Block.Type.
|
||
|
PublicKeyBlockType = "PUBLIC KEY"
|
||
|
)
|
||
|
|
||
|
// MakeEllipticPrivateKeyPEM creates an ECDSA private key
|
||
|
func MakeEllipticPrivateKeyPEM() ([]byte, error) {
|
||
|
privateKey, err := ecdsa.GenerateKey(elliptic.P256(), cryptorand.Reader)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
derBytes, err := x509.MarshalECPrivateKey(privateKey)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
privateKeyPemBlock := &pem.Block{
|
||
|
Type: ECPrivateKeyBlockType,
|
||
|
Bytes: derBytes,
|
||
|
}
|
||
|
return pem.EncodeToMemory(privateKeyPemBlock), nil
|
||
|
}
|
||
|
|
||
|
// WriteKey writes the pem-encoded key data to keyPath.
|
||
|
// The key file will be created with file mode 0600.
|
||
|
// If the key file already exists, it will be overwritten.
|
||
|
// The parent directory of the keyPath will be created as needed with file mode 0755.
|
||
|
func WriteKey(keyPath string, data []byte) error {
|
||
|
if err := os.MkdirAll(filepath.Dir(keyPath), os.FileMode(0755)); err != nil {
|
||
|
return err
|
||
|
}
|
||
|
return ioutil.WriteFile(keyPath, data, os.FileMode(0600))
|
||
|
}
|
||
|
|
||
|
// LoadOrGenerateKeyFile looks for a key in the file at the given path. If it
|
||
|
// can't find one, it will generate a new key and store it there.
|
||
|
func LoadOrGenerateKeyFile(keyPath string) (data []byte, wasGenerated bool, err error) {
|
||
|
loadedData, err := ioutil.ReadFile(keyPath)
|
||
|
// Call verifyKeyData to ensure the file wasn't empty/corrupt.
|
||
|
if err == nil && verifyKeyData(loadedData) {
|
||
|
return loadedData, false, err
|
||
|
}
|
||
|
if !os.IsNotExist(err) {
|
||
|
return nil, false, fmt.Errorf("error loading key from %s: %v", keyPath, err)
|
||
|
}
|
||
|
|
||
|
generatedData, err := MakeEllipticPrivateKeyPEM()
|
||
|
if err != nil {
|
||
|
return nil, false, fmt.Errorf("error generating key: %v", err)
|
||
|
}
|
||
|
if err := WriteKey(keyPath, generatedData); err != nil {
|
||
|
return nil, false, fmt.Errorf("error writing key to %s: %v", keyPath, err)
|
||
|
}
|
||
|
return generatedData, true, nil
|
||
|
}
|
||
|
|
||
|
// MarshalPrivateKeyToPEM converts a known private key type of RSA or ECDSA to
|
||
|
// a PEM encoded block or returns an error.
|
||
|
func MarshalPrivateKeyToPEM(privateKey crypto.PrivateKey) ([]byte, error) {
|
||
|
switch t := privateKey.(type) {
|
||
|
case *ecdsa.PrivateKey:
|
||
|
derBytes, err := x509.MarshalECPrivateKey(t)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
block := &pem.Block{
|
||
|
Type: ECPrivateKeyBlockType,
|
||
|
Bytes: derBytes,
|
||
|
}
|
||
|
return pem.EncodeToMemory(block), nil
|
||
|
case *rsa.PrivateKey:
|
||
|
block := &pem.Block{
|
||
|
Type: RSAPrivateKeyBlockType,
|
||
|
Bytes: x509.MarshalPKCS1PrivateKey(t),
|
||
|
}
|
||
|
return pem.EncodeToMemory(block), nil
|
||
|
default:
|
||
|
return nil, fmt.Errorf("private key is not a recognized type: %T", privateKey)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// PrivateKeyFromFile returns the private key in rsa.PrivateKey or ecdsa.PrivateKey format from a given PEM-encoded file.
|
||
|
// Returns an error if the file could not be read or if the private key could not be parsed.
|
||
|
func PrivateKeyFromFile(file string) (interface{}, error) {
|
||
|
data, err := ioutil.ReadFile(file)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
key, err := ParsePrivateKeyPEM(data)
|
||
|
if err != nil {
|
||
|
return nil, fmt.Errorf("error reading private key file %s: %v", file, err)
|
||
|
}
|
||
|
return key, nil
|
||
|
}
|
||
|
|
||
|
// PublicKeysFromFile returns the public keys in rsa.PublicKey or ecdsa.PublicKey format from a given PEM-encoded file.
|
||
|
// Reads public keys from both public and private key files.
|
||
|
func PublicKeysFromFile(file string) ([]interface{}, error) {
|
||
|
data, err := ioutil.ReadFile(file)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
keys, err := ParsePublicKeysPEM(data)
|
||
|
if err != nil {
|
||
|
return nil, fmt.Errorf("error reading public key file %s: %v", file, err)
|
||
|
}
|
||
|
return keys, nil
|
||
|
}
|
||
|
|
||
|
// verifyKeyData returns true if the provided data appears to be a valid private key.
|
||
|
func verifyKeyData(data []byte) bool {
|
||
|
if len(data) == 0 {
|
||
|
return false
|
||
|
}
|
||
|
_, err := ParsePrivateKeyPEM(data)
|
||
|
return err == nil
|
||
|
}
|
||
|
|
||
|
// ParsePrivateKeyPEM returns a private key parsed from a PEM block in the supplied data.
|
||
|
// Recognizes PEM blocks for "EC PRIVATE KEY", "RSA PRIVATE KEY", or "PRIVATE KEY"
|
||
|
func ParsePrivateKeyPEM(keyData []byte) (interface{}, error) {
|
||
|
var privateKeyPemBlock *pem.Block
|
||
|
for {
|
||
|
privateKeyPemBlock, keyData = pem.Decode(keyData)
|
||
|
if privateKeyPemBlock == nil {
|
||
|
break
|
||
|
}
|
||
|
|
||
|
switch privateKeyPemBlock.Type {
|
||
|
case ECPrivateKeyBlockType:
|
||
|
// ECDSA Private Key in ASN.1 format
|
||
|
if key, err := x509.ParseECPrivateKey(privateKeyPemBlock.Bytes); err == nil {
|
||
|
return key, nil
|
||
|
}
|
||
|
case RSAPrivateKeyBlockType:
|
||
|
// RSA Private Key in PKCS#1 format
|
||
|
if key, err := x509.ParsePKCS1PrivateKey(privateKeyPemBlock.Bytes); err == nil {
|
||
|
return key, nil
|
||
|
}
|
||
|
case PrivateKeyBlockType:
|
||
|
// RSA or ECDSA Private Key in unencrypted PKCS#8 format
|
||
|
if key, err := x509.ParsePKCS8PrivateKey(privateKeyPemBlock.Bytes); err == nil {
|
||
|
return key, nil
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// tolerate non-key PEM blocks for compatibility with things like "EC PARAMETERS" blocks
|
||
|
// originally, only the first PEM block was parsed and expected to be a key block
|
||
|
}
|
||
|
|
||
|
// we read all the PEM blocks and didn't recognize one
|
||
|
return nil, fmt.Errorf("data does not contain a valid RSA or ECDSA private key")
|
||
|
}
|
||
|
|
||
|
// ParsePublicKeysPEM is a helper function for reading an array of rsa.PublicKey or ecdsa.PublicKey from a PEM-encoded byte array.
|
||
|
// Reads public keys from both public and private key files.
|
||
|
func ParsePublicKeysPEM(keyData []byte) ([]interface{}, error) {
|
||
|
var block *pem.Block
|
||
|
keys := []interface{}{}
|
||
|
for {
|
||
|
// read the next block
|
||
|
block, keyData = pem.Decode(keyData)
|
||
|
if block == nil {
|
||
|
break
|
||
|
}
|
||
|
|
||
|
// test block against parsing functions
|
||
|
if privateKey, err := parseRSAPrivateKey(block.Bytes); err == nil {
|
||
|
keys = append(keys, &privateKey.PublicKey)
|
||
|
continue
|
||
|
}
|
||
|
if publicKey, err := parseRSAPublicKey(block.Bytes); err == nil {
|
||
|
keys = append(keys, publicKey)
|
||
|
continue
|
||
|
}
|
||
|
if privateKey, err := parseECPrivateKey(block.Bytes); err == nil {
|
||
|
keys = append(keys, &privateKey.PublicKey)
|
||
|
continue
|
||
|
}
|
||
|
if publicKey, err := parseECPublicKey(block.Bytes); err == nil {
|
||
|
keys = append(keys, publicKey)
|
||
|
continue
|
||
|
}
|
||
|
|
||
|
// tolerate non-key PEM blocks for backwards compatibility
|
||
|
// originally, only the first PEM block was parsed and expected to be a key block
|
||
|
}
|
||
|
|
||
|
if len(keys) == 0 {
|
||
|
return nil, fmt.Errorf("data does not contain any valid RSA or ECDSA public keys")
|
||
|
}
|
||
|
return keys, nil
|
||
|
}
|
||
|
|
||
|
// parseRSAPublicKey parses a single RSA public key from the provided data
|
||
|
func parseRSAPublicKey(data []byte) (*rsa.PublicKey, error) {
|
||
|
var err error
|
||
|
|
||
|
// Parse the key
|
||
|
var parsedKey interface{}
|
||
|
if parsedKey, err = x509.ParsePKIXPublicKey(data); err != nil {
|
||
|
if cert, err := x509.ParseCertificate(data); err == nil {
|
||
|
parsedKey = cert.PublicKey
|
||
|
} else {
|
||
|
return nil, err
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Test if parsed key is an RSA Public Key
|
||
|
var pubKey *rsa.PublicKey
|
||
|
var ok bool
|
||
|
if pubKey, ok = parsedKey.(*rsa.PublicKey); !ok {
|
||
|
return nil, fmt.Errorf("data doesn't contain valid RSA Public Key")
|
||
|
}
|
||
|
|
||
|
return pubKey, nil
|
||
|
}
|
||
|
|
||
|
// parseRSAPrivateKey parses a single RSA private key from the provided data
|
||
|
func parseRSAPrivateKey(data []byte) (*rsa.PrivateKey, error) {
|
||
|
var err error
|
||
|
|
||
|
// Parse the key
|
||
|
var parsedKey interface{}
|
||
|
if parsedKey, err = x509.ParsePKCS1PrivateKey(data); err != nil {
|
||
|
if parsedKey, err = x509.ParsePKCS8PrivateKey(data); err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Test if parsed key is an RSA Private Key
|
||
|
var privKey *rsa.PrivateKey
|
||
|
var ok bool
|
||
|
if privKey, ok = parsedKey.(*rsa.PrivateKey); !ok {
|
||
|
return nil, fmt.Errorf("data doesn't contain valid RSA Private Key")
|
||
|
}
|
||
|
|
||
|
return privKey, nil
|
||
|
}
|
||
|
|
||
|
// parseECPublicKey parses a single ECDSA public key from the provided data
|
||
|
func parseECPublicKey(data []byte) (*ecdsa.PublicKey, error) {
|
||
|
var err error
|
||
|
|
||
|
// Parse the key
|
||
|
var parsedKey interface{}
|
||
|
if parsedKey, err = x509.ParsePKIXPublicKey(data); err != nil {
|
||
|
if cert, err := x509.ParseCertificate(data); err == nil {
|
||
|
parsedKey = cert.PublicKey
|
||
|
} else {
|
||
|
return nil, err
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Test if parsed key is an ECDSA Public Key
|
||
|
var pubKey *ecdsa.PublicKey
|
||
|
var ok bool
|
||
|
if pubKey, ok = parsedKey.(*ecdsa.PublicKey); !ok {
|
||
|
return nil, fmt.Errorf("data doesn't contain valid ECDSA Public Key")
|
||
|
}
|
||
|
|
||
|
return pubKey, nil
|
||
|
}
|
||
|
|
||
|
// parseECPrivateKey parses a single ECDSA private key from the provided data
|
||
|
func parseECPrivateKey(data []byte) (*ecdsa.PrivateKey, error) {
|
||
|
var err error
|
||
|
|
||
|
// Parse the key
|
||
|
var parsedKey interface{}
|
||
|
if parsedKey, err = x509.ParseECPrivateKey(data); err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
// Test if parsed key is an ECDSA Private Key
|
||
|
var privKey *ecdsa.PrivateKey
|
||
|
var ok bool
|
||
|
if privKey, ok = parsedKey.(*ecdsa.PrivateKey); !ok {
|
||
|
return nil, fmt.Errorf("data doesn't contain valid ECDSA Private Key")
|
||
|
}
|
||
|
|
||
|
return privKey, nil
|
||
|
}
|