forked from SSLMate/go-pkcs12
/
pkcs12.go
712 lines (619 loc) · 20.9 KB
/
pkcs12.go
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// Copyright 2015, 2018, 2019 Opsmate, Inc. All rights reserved.
// 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 (also known as P12 or PFX).
// It is intended for decoding P12/PFX files for use with the crypto/tls
// package, and for encoding P12/PFX files for use by legacy applications which
// do not support newer formats. Since PKCS#12 uses weak encryption
// primitives, it SHOULD NOT be used for new applications.
//
// This package is forked from golang.org/x/crypto/pkcs12, which is frozen.
// The implementation is distilled from https://tools.ietf.org/html/rfc7292
// and referenced documents.
package pkcs12 // import "github.com/hetesiistvan/go-pkcs12"
import (
"crypto/ecdsa"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"encoding/hex"
"encoding/pem"
"errors"
"io"
"reflect"
)
// DefaultPassword is the string "changeit", a commonly-used password for
// PKCS#12 files. Due to the weak encryption used by PKCS#12, it is
// RECOMMENDED that you use DefaultPassword when encoding PKCS#12 files,
// and protect the PKCS#12 files using other means.
const DefaultPassword = "changeit"
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})
oidJavaSafebagFlag = asn1.ObjectIdentifier([]int{2, 16, 840, 1, 113894, 746875, 1, 1})
oidExtendedKeyUsage = asn1.ObjectIdentifier([]int{2, 5, 29, 37, 0})
)
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 }
func (i *encryptedContentInfo) SetData(data []byte) { i.EncryptedContent = data }
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
}
func (i *encryptedPrivateKeyInfo) SetData(data []byte) {
i.EncryptedData = data
}
// 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
}
// ToPEM converts all "safe bags" contained in pfxData to PEM blocks.
// DO NOT USE THIS FUNCTION. ToPEM creates invalid PEM blocks; private keys
// are encoded as raw RSA or EC private keys rather than PKCS#8 despite being
// labeled "PRIVATE KEY". To decode a PKCS#12 file, use DecodeChain instead,
// and use the encoding/pem package to convert to PEM if necessary.
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. Since PKCS#12 files often contain more than one certificate, you
// probably want to use DecodeChain instead.
func Decode(pfxData []byte, password string) (privateKey interface{}, certificate *x509.Certificate, err error) {
var caCerts []*x509.Certificate
privateKey, certificate, caCerts, err = DecodeChain(pfxData, password)
if len(caCerts) != 0 {
err = errors.New("pkcs12: expected exactly two safe bags in the PFX PDU")
}
return
}
// DecodeTrustStore extracts CA certificates from pfxData.
func DecodeTrustStore(pfxData []byte, password string) (certs map[string]*x509.Certificate, err error) {
encodedPassword, err := bmpString(password)
if err != nil {
return nil, err
}
bags, encodedPassword, err := getSafeContents(pfxData, encodedPassword)
if err != nil {
return nil, err
}
if len(bags) == 0 {
err = errors.New("pkcs12: no bag was found in trust store")
return nil, err
}
certs = map[string]*x509.Certificate{}
for _, bag := range bags {
if !bag.Id.Equal(oidCertBag) {
err = errors.New("pkcs12: expected only cert bags in trust store")
return nil, err
}
bagCertsData, err := decodeCertBag(bag.Value.Bytes)
if err != nil {
return nil, err
}
bagCert, err := x509.ParseCertificate(bagCertsData)
if err != nil {
return nil, err
}
friendlyName, err := certBagFriendlyName(bag.Attributes)
if err != nil {
return nil, err
}
certs[friendlyName] = bagCert
}
return
}
// DecodeChain extracts a certificate, a CA certificate chain, and private key
// from pfxData. This function checks if there is at least one certificate
// and only one private key in the pfxData. The first certificate is assumed to
// be the leaf certificate, and subsequent certificates, if any, are assumed to
// comprise the CA certificate chain.
func DecodeChain(pfxData []byte, password string) (privateKey interface{}, certificate *x509.Certificate, caCerts []*x509.Certificate, err error) {
encodedPassword, err := bmpString(password)
if err != nil {
return nil, nil, nil, err
}
bags, encodedPassword, err := getSafeContents(pfxData, encodedPassword)
if err != nil {
return nil, nil, nil, err
}
for _, bag := range bags {
switch {
case bag.Id.Equal(oidCertBag):
certsData, err := decodeCertBag(bag.Value.Bytes)
if err != nil {
return nil, nil, nil, err
}
certs, err := x509.ParseCertificates(certsData)
if err != nil {
return nil, nil, nil, err
}
if len(certs) != 1 {
err = errors.New("pkcs12: expected exactly one certificate in the certBag")
return nil, nil, nil, err
}
if certificate == nil {
certificate = certs[0]
} else {
caCerts = append(caCerts, certs[0])
}
case bag.Id.Equal(oidPKCS8ShroundedKeyBag):
if privateKey != nil {
err = errors.New("pkcs12: expected exactly one key bag")
return nil, nil, nil, err
}
if privateKey, err = decodePkcs8ShroudedKeyBag(bag.Value.Bytes, encodedPassword); err != nil {
return nil, nil, nil, err
}
}
}
if certificate == nil {
return nil, nil, nil, errors.New("pkcs12: certificate missing")
}
if privateKey == nil {
return nil, 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
}
// Encode produces pfxData containing one private key (privateKey), an
// end-entity certificate (certificate), and any number of CA certificates
// (caCerts).
//
// The private key is encrypted with the provided password, but due to the
// weak encryption primitives used by PKCS#12, it is RECOMMENDED that you
// specify a hard-coded password (such as pkcs12.DefaultPassword) and protect
// the resulting pfxData using other means.
//
// The rand argument is used to provide entropy for the encryption, and
// can be set to rand.Reader from the crypto/rand package.
//
// Encode emulates the behavior of OpenSSL's PKCS12_create: it creates two
// SafeContents: one that's encrypted with RC2 and contains the certificates,
// and another that is unencrypted and contains the private key shrouded with
// 3DES The private key bag and the end-entity certificate bag have the
// LocalKeyId attribute set to the SHA-1 fingerprint of the end-entity
// certificate.
func Encode(rand io.Reader, privateKey interface{}, certificate *x509.Certificate, caCerts []*x509.Certificate, password string) (pfxData []byte, err error) {
encodedPassword, err := bmpString(password)
if err != nil {
return nil, err
}
var pfx pfxPdu
pfx.Version = 3
var certFingerprint = sha1.Sum(certificate.Raw)
var localKeyIdAttr pkcs12Attribute
localKeyIdAttr.Id = oidLocalKeyID
localKeyIdAttr.Value.Class = 0
localKeyIdAttr.Value.Tag = 17
localKeyIdAttr.Value.IsCompound = true
if localKeyIdAttr.Value.Bytes, err = asn1.Marshal(certFingerprint[:]); err != nil {
return nil, err
}
var certBags []safeBag
var certBag *safeBag
if certBag, err = makeCertBag(certificate.Raw, []pkcs12Attribute{localKeyIdAttr}); err != nil {
return nil, err
}
certBags = append(certBags, *certBag)
for _, cert := range caCerts {
if certBag, err = makeCertBag(cert.Raw, []pkcs12Attribute{}); err != nil {
return nil, err
}
certBags = append(certBags, *certBag)
}
var keyBag safeBag
keyBag.Id = oidPKCS8ShroundedKeyBag
keyBag.Value.Class = 2
keyBag.Value.Tag = 0
keyBag.Value.IsCompound = true
if keyBag.Value.Bytes, err = encodePkcs8ShroudedKeyBag(rand, privateKey, encodedPassword); err != nil {
return nil, err
}
keyBag.Attributes = append(keyBag.Attributes, localKeyIdAttr)
// Construct an authenticated safe with two SafeContents.
// The first SafeContents is encrypted and contains the cert bags.
// The second SafeContents is unencrypted and contains the shrouded key bag.
var authenticatedSafe [2]contentInfo
if authenticatedSafe[0], err = makeSafeContents(rand, certBags, encodedPassword); err != nil {
return nil, err
}
if authenticatedSafe[1], err = makeSafeContents(rand, []safeBag{keyBag}, nil); err != nil {
return nil, err
}
var authenticatedSafeBytes []byte
if authenticatedSafeBytes, err = asn1.Marshal(authenticatedSafe[:]); err != nil {
return nil, err
}
// compute the MAC
pfx.MacData.Mac.Algorithm.Algorithm = oidSHA1
pfx.MacData.MacSalt = make([]byte, 8)
if _, err = rand.Read(pfx.MacData.MacSalt); err != nil {
return nil, err
}
pfx.MacData.Iterations = 1
if err = computeMac(&pfx.MacData, authenticatedSafeBytes, encodedPassword); err != nil {
return nil, err
}
pfx.AuthSafe.ContentType = oidDataContentType
pfx.AuthSafe.Content.Class = 2
pfx.AuthSafe.Content.Tag = 0
pfx.AuthSafe.Content.IsCompound = true
if pfx.AuthSafe.Content.Bytes, err = asn1.Marshal(authenticatedSafeBytes); err != nil {
return nil, err
}
if pfxData, err = asn1.Marshal(pfx); err != nil {
return nil, errors.New("pkcs12: error writing P12 data: " + err.Error())
}
return
}
// EncodeTrustStore produces pfxData containing any number of CA certificates
// (certs).
//
// The rand argument is used to provide entropy for the encryption, and
// can be set to rand.Reader from the crypto/rand package.
//
// EncodeTrustStore creates one SafeContent: that contains the certificates,
// The certificate bag have the LocalKeyId attribute set to the SHA-1 fingerprint of the end-entity
// certificate.
func EncodeTrustStore(rand io.Reader, certs map[string]*x509.Certificate, password string) (pfxData []byte, err error) {
encodedPassword, err := bmpString(password)
if err != nil {
return nil, err
}
var pfx pfxPdu
pfx.Version = 3
var certBags []safeBag
var certBag *safeBag
for alias, cert := range certs {
var attributes []pkcs12Attribute
if attributes, err = certBagAttributes(alias); err != nil {
return nil, err
}
if certBag, err = makeCertBag(cert.Raw, attributes); err != nil {
return nil, err
}
certBags = append(certBags, *certBag)
}
// Construct an authenticated safe with two SafeContents.
// The first SafeContents is encrypted and contains the cert bags.
// The second SafeContents is unencrypted and contains the shrouded key bag.
var authenticatedSafe [1]contentInfo
if authenticatedSafe[0], err = makeSafeContents(rand, certBags, encodedPassword); err != nil {
return nil, err
}
var authenticatedSafeBytes []byte
if authenticatedSafeBytes, err = asn1.Marshal(authenticatedSafe[:]); err != nil {
return nil, err
}
// compute the MAC
pfx.MacData.Mac.Algorithm.Algorithm = oidSHA1
pfx.MacData.MacSalt = make([]byte, 8)
if _, err = rand.Read(pfx.MacData.MacSalt); err != nil {
return nil, err
}
pfx.MacData.Iterations = 1
if err = computeMac(&pfx.MacData, authenticatedSafeBytes, encodedPassword); err != nil {
return nil, err
}
pfx.AuthSafe.ContentType = oidDataContentType
pfx.AuthSafe.Content.Class = 2
pfx.AuthSafe.Content.Tag = 0
pfx.AuthSafe.Content.IsCompound = true
if pfx.AuthSafe.Content.Bytes, err = asn1.Marshal(authenticatedSafeBytes); err != nil {
return nil, err
}
if pfxData, err = asn1.Marshal(pfx); err != nil {
return nil, errors.New("pkcs12: error writing P12 data: " + err.Error())
}
return
}
// certBagAttributes returns a list of pkcs12 attributes needed for a cert bag
// to be recognized as trustedCertEntry by the java keytool.
//
// This requires the following attribute to be present:
// 2.16.840.1.113894.746875.1.1
// See https://github.com/kaikramer/keystore-explorer/issues/35
//
// Additionally an alias is also added to the attribute list.
func certBagAttributes(alias string) (attributes []pkcs12Attribute, err error) {
var aliasBytes []byte
if aliasBytes, err = marshalBmpString(alias); err != nil {
return nil, err
}
var extKeyUsageOidBytes []byte
if extKeyUsageOidBytes, err = asn1.Marshal(oidExtendedKeyUsage); err != nil {
return nil, err
}
attributes = []pkcs12Attribute{
// Alias
pkcs12Attribute{
Id: oidFriendlyName,
Value: asn1.RawValue{
Class: 0,
Tag: 17,
IsCompound: true,
Bytes: aliasBytes,
},
},
// Special tag
pkcs12Attribute{
Id: oidJavaSafebagFlag,
Value: asn1.RawValue{
Class: 0,
Tag: 17,
IsCompound: true,
Bytes: extKeyUsageOidBytes,
},
},
}
return
}
func certBagFriendlyName(attributes []pkcs12Attribute) (friendlyName string, err error) {
for _, attribute := range attributes {
if reflect.DeepEqual(attribute.Id, oidFriendlyName) {
friendlyName, err = unmarshalBmpString(attribute.Value.Bytes)
return
}
}
return "", errors.New("pkcs12: friendly name not specified for cert bag")
}
func makeCertBag(certBytes []byte, attributes []pkcs12Attribute) (certBag *safeBag, err error) {
certBag = new(safeBag)
certBag.Id = oidCertBag
certBag.Value.Class = 2
certBag.Value.Tag = 0
certBag.Value.IsCompound = true
if certBag.Value.Bytes, err = encodeCertBag(certBytes); err != nil {
return nil, err
}
certBag.Attributes = attributes
return
}
func makeSafeContents(rand io.Reader, bags []safeBag, password []byte) (ci contentInfo, err error) {
var data []byte
if data, err = asn1.Marshal(bags); err != nil {
return
}
if password == nil {
ci.ContentType = oidDataContentType
ci.Content.Class = 2
ci.Content.Tag = 0
ci.Content.IsCompound = true
if ci.Content.Bytes, err = asn1.Marshal(data); err != nil {
return
}
} else {
randomSalt := make([]byte, 8)
if _, err = rand.Read(randomSalt); err != nil {
return
}
var algo pkix.AlgorithmIdentifier
algo.Algorithm = oidPBEWithSHAAnd40BitRC2CBC
if algo.Parameters.FullBytes, err = asn1.Marshal(pbeParams{Salt: randomSalt, Iterations: 2048}); err != nil {
return
}
var encryptedData encryptedData
encryptedData.Version = 0
encryptedData.EncryptedContentInfo.ContentType = oidDataContentType
encryptedData.EncryptedContentInfo.ContentEncryptionAlgorithm = algo
if err = pbEncrypt(&encryptedData.EncryptedContentInfo, data, password); err != nil {
return
}
ci.ContentType = oidEncryptedDataContentType
ci.Content.Class = 2
ci.Content.Tag = 0
ci.Content.IsCompound = true
if ci.Content.Bytes, err = asn1.Marshal(encryptedData); err != nil {
return
}
}
return
}