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Copy pathcerts.go
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115 lines (103 loc) · 3.67 KB
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/*
* MinIO Cloud Storage, (C) 2015, 2016, 2017 MinIO, Inc.
*
* 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 config
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"io/ioutil"
"github.com/minio/minio/pkg/env"
)
// EnvCertPassword is the environment variable which contains the password used
// to decrypt the TLS private key. It must be set if the TLS private key is
// password protected.
const EnvCertPassword = "MINIO_CERT_PASSWD"
// ParsePublicCertFile - parses public cert into its *x509.Certificate equivalent.
func ParsePublicCertFile(certFile string) (x509Certs []*x509.Certificate, err error) {
// Read certificate file.
var data []byte
if data, err = ioutil.ReadFile(certFile); err != nil {
return nil, err
}
// Trimming leading and tailing white spaces.
data = bytes.TrimSpace(data)
// Parse all certs in the chain.
current := data
for len(current) > 0 {
var pemBlock *pem.Block
if pemBlock, current = pem.Decode(current); pemBlock == nil {
return nil, ErrSSLUnexpectedData(nil).Msg("Could not read PEM block from file %s", certFile)
}
var x509Cert *x509.Certificate
if x509Cert, err = x509.ParseCertificate(pemBlock.Bytes); err != nil {
return nil, ErrSSLUnexpectedData(err)
}
x509Certs = append(x509Certs, x509Cert)
}
if len(x509Certs) == 0 {
return nil, ErrSSLUnexpectedData(nil).Msg("Empty public certificate file %s", certFile)
}
return x509Certs, nil
}
// LoadX509KeyPair - load an X509 key pair (private key , certificate)
// from the provided paths. The private key may be encrypted and is
// decrypted using the ENV_VAR: MINIO_CERT_PASSWD.
func LoadX509KeyPair(certFile, keyFile string) (tls.Certificate, error) {
certPEMBlock, err := ioutil.ReadFile(certFile)
if err != nil {
return tls.Certificate{}, ErrSSLUnexpectedError(err)
}
keyPEMBlock, err := ioutil.ReadFile(keyFile)
if err != nil {
return tls.Certificate{}, ErrSSLUnexpectedError(err)
}
key, rest := pem.Decode(keyPEMBlock)
if len(rest) > 0 {
return tls.Certificate{}, ErrSSLUnexpectedData(nil).Msg("The private key contains additional data")
}
if x509.IsEncryptedPEMBlock(key) {
password := env.Get(EnvCertPassword, "")
if len(password) == 0 {
return tls.Certificate{}, ErrSSLNoPassword(nil)
}
decryptedKey, decErr := x509.DecryptPEMBlock(key, []byte(password))
if decErr != nil {
return tls.Certificate{}, ErrSSLWrongPassword(decErr)
}
keyPEMBlock = pem.EncodeToMemory(&pem.Block{Type: key.Type, Bytes: decryptedKey})
}
cert, err := tls.X509KeyPair(certPEMBlock, keyPEMBlock)
if err != nil {
return tls.Certificate{}, ErrSSLUnexpectedData(nil).Msg(err.Error())
}
// Ensure that the private key is not a P-384 or P-521 EC key.
// The Go TLS stack does not provide constant-time implementations of P-384 and P-521.
if priv, ok := cert.PrivateKey.(crypto.Signer); ok {
if pub, ok := priv.Public().(*ecdsa.PublicKey); ok {
switch pub.Params().Name {
case "P-384":
fallthrough
case "P-521":
// unfortunately there is no cleaner way to check
return tls.Certificate{}, ErrSSLUnexpectedData(nil).Msg("tls: the ECDSA curve '%s' is not supported", pub.Params().Name)
}
}
}
return cert, nil
}