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pkcs12.go
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pkcs12.go
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// Package pkcs12 provides some implementations 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 certificate+key for use with the crypto/tls package.
package pkcs12
import (
"bytes"
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"encoding/pem"
"fmt"
)
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"`
}
const (
oidDataContentType = "1.2.840.113549.1.7.1"
oidEncryptedDataContentType = "1.2.840.113549.1.7.6"
)
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) GetAlgorithm() pkix.AlgorithmIdentifier {
return i.ContentEncryptionAlgorithm
}
func (i encryptedContentInfo) GetData() []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 `ans1:"set"`
}
type encryptedPrivateKeyInfo struct {
AlgorithmIdentifier pkix.AlgorithmIdentifier
EncryptedData []byte
}
func (i encryptedPrivateKeyInfo) GetAlgorithm() pkix.AlgorithmIdentifier { return i.AlgorithmIdentifier }
func (i encryptedPrivateKeyInfo) GetData() []byte { return i.EncryptedData }
// UnsupportedFormat Error indicates that the input is in an unsupported format.
// The format may be allowed by the RFC's, but may not be implemented by this package.
type UnsupportedFormat string
func (e UnsupportedFormat) Error() string { return string(e) }
// ConvertToPEM converts all "safe bags" contained in pfxData to PEM blocks.
func ConvertToPEM(pfxData []byte, utf8Password []byte) (blocks []*pem.Block, err error) {
p, err := bmpString(utf8Password)
for i := 0; i < len(utf8Password); i++ {
utf8Password[i] = 0
}
if err != nil {
err = PasswordIncorrect(err.Error())
return
}
bags, p, err := getSafeContents(pfxData, p)
blocks = make([]*pem.Block, 0, 2)
for _, bag := range bags {
var block *pem.Block
block, err = convertBag(&bag, p)
if err != nil {
return
}
blocks = append(blocks, block)
}
return
}
func convertBag(bag *safeBag, password []byte) (*pem.Block, error) {
b := new(pem.Block)
for _, attribute := range bag.Attributes {
k, v, err := convertAttribute(&attribute)
if err != nil {
return nil, err
}
if b.Headers == nil {
b.Headers = make(map[string]string)
}
b.Headers[k] = v
}
bagType := bagTypeNameByOID[bag.ID.String()]
switch bagType {
case certBagType:
b.Type = "CERTIFICATE"
certsData, err := decodeCertBag(bag.Value.Bytes)
if err != nil {
return nil, err
}
b.Bytes = certsData
case pkcs8ShroudedKeyBagType:
b.Type = "PRIVATE KEY"
key, err := decodePkcs8ShroudedKeyBag(bag.Value.Bytes, password)
if err != nil {
return nil, err
}
switch key := key.(type) {
case *rsa.PrivateKey:
b.Bytes = x509.MarshalPKCS1PrivateKey(key)
case *ecdsa.PrivateKey:
b.Bytes, err = x509.MarshalECPrivateKey(key)
if err != nil {
return nil, err
}
default:
return nil, UnsupportedFormat("found unknown private key type in PKCS#8 wrapping")
}
default:
return nil, UnsupportedFormat("don't know how to convert a safe bag of type " + bag.ID.String())
}
return b, nil
}
const (
oidFriendlyName = "1.2.840.113549.1.9.20"
oidLocalKeyID = "1.2.840.113549.1.9.21"
oidMicrosoftCSPName = "1.3.6.1.4.1.311.17.1"
)
var attributeNameByOID = map[string]string{
oidFriendlyName: "friendlyName",
oidLocalKeyID: "localKeyId",
oidMicrosoftCSPName: "Microsoft CSP Name", // openssl-compatible
}
func convertAttribute(attribute *pkcs12Attribute) (key, value string, err error) {
oid := attribute.ID.String()
key = attributeNameByOID[oid]
switch oid {
case oidMicrosoftCSPName:
fallthrough
case oidFriendlyName:
if _, err = asn1.Unmarshal(attribute.Value.Bytes, &attribute.Value); err != nil {
return
}
if value, err = decodeBMPString(attribute.Value.Bytes); err != nil {
return
}
case oidLocalKeyID:
id := new([]byte)
if _, err = asn1.Unmarshal(attribute.Value.Bytes, id); err != nil {
return
}
value = fmt.Sprintf("% x", *id)
default:
err = UnsupportedFormat("don't know how to handle attribute with OID " + attribute.ID.String())
return
}
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, utf8Password []byte) (privateKey interface{}, certificate *x509.Certificate, err error) {
p, err := bmpString(utf8Password)
for i := 0; i < len(utf8Password); i++ {
utf8Password[i] = 0
}
if err != nil {
return nil, nil, err
}
bags, p, err := getSafeContents(pfxData, p)
if err != nil {
return nil, nil, err
}
if len(bags) != 2 {
err = UnsupportedFormat("Expected exactly two safe bags in the PFX PDU")
return
}
for _, bag := range bags {
bagType := bagTypeNameByOID[bag.ID.String()]
switch bagType {
case certBagType:
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 = UnsupportedFormat("Expected exactly one certificate in the certBag")
return nil, nil, err
}
certificate = certs[0]
case pkcs8ShroudedKeyBagType:
if privateKey, err = decodePkcs8ShroudedKeyBag(bag.Value.Bytes, p); err != nil {
return nil, nil, err
}
}
}
if certificate == nil {
return nil, nil, UnsupportedFormat("certificate missing")
}
if privateKey == nil {
return nil, nil, UnsupportedFormat("private key missing")
}
return
}
func getSafeContents(p12Data, password []byte) (bags []safeBag, actualPassword []byte, err error) {
pfx := new(pfxPdu)
if _, err = asn1.Unmarshal(p12Data, pfx); err != nil {
return nil, nil, fmt.Errorf("error reading P12 data: %v", err)
}
if pfx.Version != 3 {
return nil, nil, UnsupportedFormat("Can only decode v3 PFX PDU's")
}
if pfx.AuthSafe.ContentType.String() != oidDataContentType {
return nil, nil, UnsupportedFormat("Only password-protected PFX is implemented")
}
// unmarshal the explicit bytes in the content for type 'data'
if _, err = asn1.Unmarshal(pfx.AuthSafe.Content.Bytes, &pfx.AuthSafe.Content); err != nil {
return nil, nil, err
}
actualPassword = password
password = nil
if len(pfx.MacData.Mac.Algorithm.Algorithm) > 0 {
if err = verifyMac(&pfx.MacData, pfx.AuthSafe.Content.Bytes, actualPassword); err != nil {
if _, pwIncorrect := err.(PasswordIncorrect); pwIncorrect && bytes.Compare(actualPassword, []byte{0, 0}) == 0 {
// some implementations use an empty byte array for the empty string password
// try one more time with empty-empty password
actualPassword = []byte{}
err = verifyMac(&pfx.MacData, pfx.AuthSafe.Content.Bytes, actualPassword)
}
}
if err != nil {
return
}
}
var authenticatedSafe []contentInfo
if _, err = asn1.Unmarshal(pfx.AuthSafe.Content.Bytes, &authenticatedSafe); err != nil {
return
}
if len(authenticatedSafe) != 2 {
return nil, nil, UnsupportedFormat(fmt.Sprintf("Expected two items in the authenticated safe, but found %d", len(authenticatedSafe)))
}
for _, ci := range authenticatedSafe {
var data []byte
switch ci.ContentType.String() {
case oidDataContentType:
if _, err = asn1.Unmarshal(ci.Content.Bytes, &data); err != nil {
return
}
case oidEncryptedDataContentType:
var encryptedData encryptedData
if _, err = asn1.Unmarshal(ci.Content.Bytes, &encryptedData); err != nil {
return
}
if encryptedData.Version != 0 {
return nil, nil, UnsupportedFormat("Only version 0 of EncryptedData is supported")
}
if data, err = pbDecrypt(encryptedData.EncryptedContentInfo, actualPassword); err != nil {
return
}
default:
return nil, nil, UnsupportedFormat("Only data and encryptedData content types are supported in authenticated safe")
}
var safeContents []safeBag
if _, err = asn1.Unmarshal(data, &safeContents); err != nil {
return
}
bags = append(bags, safeContents...)
}
return
}