346 lines
9.2 KiB
Go
346 lines
9.2 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Package pkcs12 implements some of PKCS#12.
|
|
//
|
|
// This implementation is distilled from https://tools.ietf.org/html/rfc7292
|
|
// and referenced documents. It is intended for decoding P12/PFX-stored
|
|
// certificates and keys for use with the crypto/tls package.
|
|
package pkcs12
|
|
|
|
import (
|
|
"crypto/ecdsa"
|
|
"crypto/rsa"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/asn1"
|
|
"encoding/hex"
|
|
"encoding/pem"
|
|
"errors"
|
|
)
|
|
|
|
var (
|
|
oidDataContentType = asn1.ObjectIdentifier([]int{1, 2, 840, 113549, 1, 7, 1})
|
|
oidEncryptedDataContentType = asn1.ObjectIdentifier([]int{1, 2, 840, 113549, 1, 7, 6})
|
|
|
|
oidFriendlyName = asn1.ObjectIdentifier([]int{1, 2, 840, 113549, 1, 9, 20})
|
|
oidLocalKeyID = asn1.ObjectIdentifier([]int{1, 2, 840, 113549, 1, 9, 21})
|
|
oidMicrosoftCSPName = asn1.ObjectIdentifier([]int{1, 3, 6, 1, 4, 1, 311, 17, 1})
|
|
)
|
|
|
|
type pfxPdu struct {
|
|
Version int
|
|
AuthSafe contentInfo
|
|
MacData macData `asn1:"optional"`
|
|
}
|
|
|
|
type contentInfo struct {
|
|
ContentType asn1.ObjectIdentifier
|
|
Content asn1.RawValue `asn1:"tag:0,explicit,optional"`
|
|
}
|
|
|
|
type encryptedData struct {
|
|
Version int
|
|
EncryptedContentInfo encryptedContentInfo
|
|
}
|
|
|
|
type encryptedContentInfo struct {
|
|
ContentType asn1.ObjectIdentifier
|
|
ContentEncryptionAlgorithm pkix.AlgorithmIdentifier
|
|
EncryptedContent []byte `asn1:"tag:0,optional"`
|
|
}
|
|
|
|
func (i encryptedContentInfo) Algorithm() pkix.AlgorithmIdentifier {
|
|
return i.ContentEncryptionAlgorithm
|
|
}
|
|
|
|
func (i encryptedContentInfo) Data() []byte { return i.EncryptedContent }
|
|
|
|
type safeBag struct {
|
|
Id asn1.ObjectIdentifier
|
|
Value asn1.RawValue `asn1:"tag:0,explicit"`
|
|
Attributes []pkcs12Attribute `asn1:"set,optional"`
|
|
}
|
|
|
|
type pkcs12Attribute struct {
|
|
Id asn1.ObjectIdentifier
|
|
Value asn1.RawValue `asn1:"set"`
|
|
}
|
|
|
|
type encryptedPrivateKeyInfo struct {
|
|
AlgorithmIdentifier pkix.AlgorithmIdentifier
|
|
EncryptedData []byte
|
|
}
|
|
|
|
func (i encryptedPrivateKeyInfo) Algorithm() pkix.AlgorithmIdentifier {
|
|
return i.AlgorithmIdentifier
|
|
}
|
|
|
|
func (i encryptedPrivateKeyInfo) Data() []byte {
|
|
return i.EncryptedData
|
|
}
|
|
|
|
// PEM block types
|
|
const (
|
|
certificateType = "CERTIFICATE"
|
|
privateKeyType = "PRIVATE KEY"
|
|
)
|
|
|
|
// unmarshal calls asn1.Unmarshal, but also returns an error if there is any
|
|
// trailing data after unmarshaling.
|
|
func unmarshal(in []byte, out interface{}) error {
|
|
trailing, err := asn1.Unmarshal(in, out)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(trailing) != 0 {
|
|
return errors.New("pkcs12: trailing data found")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ConvertToPEM converts all "safe bags" contained in pfxData to PEM blocks.
|
|
func ToPEM(pfxData []byte, password string) ([]*pem.Block, error) {
|
|
encodedPassword, err := bmpString(password)
|
|
if err != nil {
|
|
return nil, ErrIncorrectPassword
|
|
}
|
|
|
|
bags, encodedPassword, err := getSafeContents(pfxData, encodedPassword)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
blocks := make([]*pem.Block, 0, len(bags))
|
|
for _, bag := range bags {
|
|
block, err := convertBag(&bag, encodedPassword)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
blocks = append(blocks, block)
|
|
}
|
|
|
|
return blocks, nil
|
|
}
|
|
|
|
func convertBag(bag *safeBag, password []byte) (*pem.Block, error) {
|
|
block := &pem.Block{
|
|
Headers: make(map[string]string),
|
|
}
|
|
|
|
for _, attribute := range bag.Attributes {
|
|
k, v, err := convertAttribute(&attribute)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
block.Headers[k] = v
|
|
}
|
|
|
|
switch {
|
|
case bag.Id.Equal(oidCertBag):
|
|
block.Type = certificateType
|
|
certsData, err := decodeCertBag(bag.Value.Bytes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
block.Bytes = certsData
|
|
case bag.Id.Equal(oidPKCS8ShroundedKeyBag):
|
|
block.Type = privateKeyType
|
|
|
|
key, err := decodePkcs8ShroudedKeyBag(bag.Value.Bytes, password)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
switch key := key.(type) {
|
|
case *rsa.PrivateKey:
|
|
block.Bytes = x509.MarshalPKCS1PrivateKey(key)
|
|
case *ecdsa.PrivateKey:
|
|
block.Bytes, err = x509.MarshalECPrivateKey(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
default:
|
|
return nil, errors.New("found unknown private key type in PKCS#8 wrapping")
|
|
}
|
|
default:
|
|
return nil, errors.New("don't know how to convert a safe bag of type " + bag.Id.String())
|
|
}
|
|
return block, nil
|
|
}
|
|
|
|
func convertAttribute(attribute *pkcs12Attribute) (key, value string, err error) {
|
|
isString := false
|
|
|
|
switch {
|
|
case attribute.Id.Equal(oidFriendlyName):
|
|
key = "friendlyName"
|
|
isString = true
|
|
case attribute.Id.Equal(oidLocalKeyID):
|
|
key = "localKeyId"
|
|
case attribute.Id.Equal(oidMicrosoftCSPName):
|
|
// This key is chosen to match OpenSSL.
|
|
key = "Microsoft CSP Name"
|
|
isString = true
|
|
default:
|
|
return "", "", errors.New("pkcs12: unknown attribute with OID " + attribute.Id.String())
|
|
}
|
|
|
|
if isString {
|
|
if err := unmarshal(attribute.Value.Bytes, &attribute.Value); err != nil {
|
|
return "", "", err
|
|
}
|
|
if value, err = decodeBMPString(attribute.Value.Bytes); err != nil {
|
|
return "", "", err
|
|
}
|
|
} else {
|
|
var id []byte
|
|
if err := unmarshal(attribute.Value.Bytes, &id); err != nil {
|
|
return "", "", err
|
|
}
|
|
value = hex.EncodeToString(id)
|
|
}
|
|
|
|
return key, value, nil
|
|
}
|
|
|
|
// Decode extracts a certificate and private key from pfxData. This function
|
|
// assumes that there is only one certificate and only one private key in the
|
|
// pfxData.
|
|
func Decode(pfxData []byte, password string) (privateKey interface{}, certificate *x509.Certificate, err error) {
|
|
encodedPassword, err := bmpString(password)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
bags, encodedPassword, err := getSafeContents(pfxData, encodedPassword)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
if len(bags) != 2 {
|
|
err = errors.New("pkcs12: expected exactly two safe bags in the PFX PDU")
|
|
return
|
|
}
|
|
|
|
for _, bag := range bags {
|
|
switch {
|
|
case bag.Id.Equal(oidCertBag):
|
|
if certificate != nil {
|
|
err = errors.New("pkcs12: expected exactly one certificate bag")
|
|
}
|
|
|
|
certsData, err := decodeCertBag(bag.Value.Bytes)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
certs, err := x509.ParseCertificates(certsData)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if len(certs) != 1 {
|
|
err = errors.New("pkcs12: expected exactly one certificate in the certBag")
|
|
return nil, nil, err
|
|
}
|
|
certificate = certs[0]
|
|
|
|
case bag.Id.Equal(oidPKCS8ShroundedKeyBag):
|
|
if privateKey != nil {
|
|
err = errors.New("pkcs12: expected exactly one key bag")
|
|
}
|
|
|
|
if privateKey, err = decodePkcs8ShroudedKeyBag(bag.Value.Bytes, encodedPassword); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
}
|
|
}
|
|
|
|
if certificate == nil {
|
|
return nil, nil, errors.New("pkcs12: certificate missing")
|
|
}
|
|
if privateKey == nil {
|
|
return nil, nil, errors.New("pkcs12: private key missing")
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func getSafeContents(p12Data, password []byte) (bags []safeBag, updatedPassword []byte, err error) {
|
|
pfx := new(pfxPdu)
|
|
if err := unmarshal(p12Data, pfx); err != nil {
|
|
return nil, nil, errors.New("pkcs12: error reading P12 data: " + err.Error())
|
|
}
|
|
|
|
if pfx.Version != 3 {
|
|
return nil, nil, NotImplementedError("can only decode v3 PFX PDU's")
|
|
}
|
|
|
|
if !pfx.AuthSafe.ContentType.Equal(oidDataContentType) {
|
|
return nil, nil, NotImplementedError("only password-protected PFX is implemented")
|
|
}
|
|
|
|
// unmarshal the explicit bytes in the content for type 'data'
|
|
if err := unmarshal(pfx.AuthSafe.Content.Bytes, &pfx.AuthSafe.Content); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
if len(pfx.MacData.Mac.Algorithm.Algorithm) == 0 {
|
|
return nil, nil, errors.New("pkcs12: no MAC in data")
|
|
}
|
|
|
|
if err := verifyMac(&pfx.MacData, pfx.AuthSafe.Content.Bytes, password); err != nil {
|
|
if err == ErrIncorrectPassword && len(password) == 2 && password[0] == 0 && password[1] == 0 {
|
|
// some implementations use an empty byte array
|
|
// for the empty string password try one more
|
|
// time with empty-empty password
|
|
password = nil
|
|
err = verifyMac(&pfx.MacData, pfx.AuthSafe.Content.Bytes, password)
|
|
}
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
}
|
|
|
|
var authenticatedSafe []contentInfo
|
|
if err := unmarshal(pfx.AuthSafe.Content.Bytes, &authenticatedSafe); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
if len(authenticatedSafe) != 2 {
|
|
return nil, nil, NotImplementedError("expected exactly two items in the authenticated safe")
|
|
}
|
|
|
|
for _, ci := range authenticatedSafe {
|
|
var data []byte
|
|
|
|
switch {
|
|
case ci.ContentType.Equal(oidDataContentType):
|
|
if err := unmarshal(ci.Content.Bytes, &data); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
case ci.ContentType.Equal(oidEncryptedDataContentType):
|
|
var encryptedData encryptedData
|
|
if err := unmarshal(ci.Content.Bytes, &encryptedData); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if encryptedData.Version != 0 {
|
|
return nil, nil, NotImplementedError("only version 0 of EncryptedData is supported")
|
|
}
|
|
if data, err = pbDecrypt(encryptedData.EncryptedContentInfo, password); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
default:
|
|
return nil, nil, NotImplementedError("only data and encryptedData content types are supported in authenticated safe")
|
|
}
|
|
|
|
var safeContents []safeBag
|
|
if err := unmarshal(data, &safeContents); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
bags = append(bags, safeContents...)
|
|
}
|
|
|
|
return bags, password, nil
|
|
}
|