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pkcs12.go
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pkcs12.go
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//
// Copyright (c) SAS Institute 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 certloader
import (
"crypto"
"crypto/x509"
"encoding/pem"
"errors"
"github.com/sassoftware/relic/lib/passprompt"
"github.com/sassoftware/relic/lib/x509tools"
"golang.org/x/crypto/pkcs12"
)
func ParsePKCS12(blob []byte, prompt passprompt.PasswordGetter) (*Certificate, error) {
var password string
var blocks []*pem.Block
var triedEmpty bool
for {
var err error
password, err = prompt.GetPasswd("Password for PKCS12: ")
if err != nil {
return nil, err
} else if password == "" {
if triedEmpty {
return nil, errors.New("aborted")
}
triedEmpty = true
}
blocks, err = pkcs12.ToPEM(blob, password)
if err == nil {
break
} else if err != pkcs12.ErrIncorrectPassword {
return nil, err
}
}
var certs []*x509.Certificate
var privKey crypto.PrivateKey
for _, block := range blocks {
switch block.Type {
case "CERTIFICATE":
newcerts, err := parseCertificatesDer(block.Bytes)
if err != nil {
return nil, err
}
certs = append(certs, newcerts.Certificates...)
case "PRIVATE KEY":
if privKey != nil {
return nil, errors.New("multiple private keys")
}
var err error
privKey, err = parsePrivateKey(block.Bytes)
if err != nil {
return nil, err
}
}
}
if privKey == nil {
return nil, errors.New("incorrect password or no private key")
}
ret := &Certificate{PrivateKey: privKey, Certificates: certs}
for _, cert := range certs {
if x509tools.SameKey(cert.PublicKey, privKey) {
ret.Leaf = cert
}
}
if ret.Leaf == nil {
return nil, errors.New("leaf certificate not found")
}
return ret, nil
}