127 lines
4.1 KiB
Go
127 lines
4.1 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package config
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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/tls"
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"crypto/x509"
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"encoding/pem"
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"errors"
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"io/ioutil"
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"github.com/minio/minio/pkg/env"
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)
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// EnvCertPassword is the environment variable which contains the password used
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// to decrypt the TLS private key. It must be set if the TLS private key is
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// password protected.
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const EnvCertPassword = "MINIO_CERT_PASSWD"
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// ParsePublicCertFile - parses public cert into its *x509.Certificate equivalent.
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func ParsePublicCertFile(certFile string) (x509Certs []*x509.Certificate, err error) {
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// Read certificate file.
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var data []byte
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if data, err = ioutil.ReadFile(certFile); err != nil {
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return nil, err
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}
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// Trimming leading and tailing white spaces.
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data = bytes.TrimSpace(data)
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// Parse all certs in the chain.
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current := data
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for len(current) > 0 {
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var pemBlock *pem.Block
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if pemBlock, current = pem.Decode(current); pemBlock == nil {
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return nil, ErrSSLUnexpectedData(nil).Msg("Could not read PEM block from file %s", certFile)
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}
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var x509Cert *x509.Certificate
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if x509Cert, err = x509.ParseCertificate(pemBlock.Bytes); err != nil {
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return nil, ErrSSLUnexpectedData(err)
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}
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x509Certs = append(x509Certs, x509Cert)
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}
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if len(x509Certs) == 0 {
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return nil, ErrSSLUnexpectedData(nil).Msg("Empty public certificate file %s", certFile)
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}
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return x509Certs, nil
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}
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// LoadX509KeyPair - load an X509 key pair (private key , certificate)
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// from the provided paths. The private key may be encrypted and is
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// decrypted using the ENV_VAR: MINIO_CERT_PASSWD.
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func LoadX509KeyPair(certFile, keyFile string) (tls.Certificate, error) {
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certPEMBlock, err := ioutil.ReadFile(certFile)
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if err != nil {
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return tls.Certificate{}, ErrSSLUnexpectedError(err)
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}
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keyPEMBlock, err := ioutil.ReadFile(keyFile)
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if err != nil {
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return tls.Certificate{}, ErrSSLUnexpectedError(err)
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}
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key, rest := pem.Decode(keyPEMBlock)
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if len(rest) > 0 {
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return tls.Certificate{}, ErrSSLUnexpectedData(nil).Msg("The private key contains additional data")
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}
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if x509.IsEncryptedPEMBlock(key) {
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password := env.Get(EnvCertPassword, "")
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if len(password) == 0 {
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return tls.Certificate{}, ErrSSLNoPassword(nil)
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}
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decryptedKey, decErr := x509.DecryptPEMBlock(key, []byte(password))
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if decErr != nil {
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return tls.Certificate{}, ErrSSLWrongPassword(decErr)
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}
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keyPEMBlock = pem.EncodeToMemory(&pem.Block{Type: key.Type, Bytes: decryptedKey})
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}
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cert, err := tls.X509KeyPair(certPEMBlock, keyPEMBlock)
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if err != nil {
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return tls.Certificate{}, ErrSSLUnexpectedData(nil).Msg(err.Error())
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}
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// Ensure that the private key is not a P-384 or P-521 EC key.
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// The Go TLS stack does not provide constant-time implementations of P-384 and P-521.
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if priv, ok := cert.PrivateKey.(crypto.Signer); ok {
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if pub, ok := priv.Public().(*ecdsa.PublicKey); ok {
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switch pub.Params().Name {
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case "P-384":
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fallthrough
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case "P-521":
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// unfortunately there is no cleaner way to check
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return tls.Certificate{}, ErrSSLUnexpectedData(nil).Msg("tls: the ECDSA curve '%s' is not supported", pub.Params().Name)
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}
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}
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}
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return cert, nil
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}
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// EnsureCertAndKey checks if both client certificate and key paths are provided
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func EnsureCertAndKey(ClientCert, ClientKey string) error {
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if (ClientCert != "" && ClientKey == "") ||
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(ClientCert == "" && ClientKey != "") {
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return errors.New("cert and key must be specified as a pair")
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}
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return nil
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}
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