129 lines
3.9 KiB
Go
129 lines
3.9 KiB
Go
// Package certificate contains functions to load an Apple APNs PKCS#12
|
|
// or PEM certificate from either an in memory byte array or a local file.
|
|
package certificate
|
|
|
|
import (
|
|
"crypto"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"encoding/pem"
|
|
"errors"
|
|
"io/ioutil"
|
|
"strings"
|
|
|
|
"golang.org/x/crypto/pkcs12"
|
|
)
|
|
|
|
// Possible errors when parsing a certificate.
|
|
var (
|
|
ErrFailedToDecryptKey = errors.New("failed to decrypt private key")
|
|
ErrFailedToParsePKCS1PrivateKey = errors.New("failed to parse PKCS1 private key")
|
|
ErrFailedToParseCertificate = errors.New("failed to parse certificate PEM data")
|
|
ErrNoPrivateKey = errors.New("no private key")
|
|
ErrNoCertificate = errors.New("no certificate")
|
|
)
|
|
|
|
// FromP12File loads a PKCS#12 certificate from a local file and returns a
|
|
// tls.Certificate.
|
|
//
|
|
// Use "" as the password argument if the pem certificate is not password
|
|
// protected.
|
|
func FromP12File(filename string, password string) (tls.Certificate, error) {
|
|
p12bytes, err := ioutil.ReadFile(filename)
|
|
if err != nil {
|
|
return tls.Certificate{}, err
|
|
}
|
|
return FromP12Bytes(p12bytes, password)
|
|
}
|
|
|
|
// FromP12Bytes loads a PKCS#12 certificate from an in memory byte array and
|
|
// returns a tls.Certificate.
|
|
//
|
|
// Use "" as the password argument if the PKCS#12 certificate is not password
|
|
// protected.
|
|
func FromP12Bytes(bytes []byte, password string) (tls.Certificate, error) {
|
|
key, cert, err := pkcs12.Decode(bytes, password)
|
|
if err != nil {
|
|
return tls.Certificate{}, err
|
|
}
|
|
return tls.Certificate{
|
|
Certificate: [][]byte{cert.Raw},
|
|
PrivateKey: key,
|
|
Leaf: cert,
|
|
}, nil
|
|
}
|
|
|
|
// FromPemFile loads a PEM certificate from a local file and returns a
|
|
// tls.Certificate. This function is similar to the crypto/tls LoadX509KeyPair
|
|
// function, however it supports PEM files with the cert and key combined
|
|
// in the same file, as well as password protected key files which are both
|
|
// common with APNs certificates.
|
|
//
|
|
// Use "" as the password argument if the PEM certificate is not password
|
|
// protected.
|
|
func FromPemFile(filename string, password string) (tls.Certificate, error) {
|
|
bytes, err := ioutil.ReadFile(filename)
|
|
if err != nil {
|
|
return tls.Certificate{}, err
|
|
}
|
|
return FromPemBytes(bytes, password)
|
|
}
|
|
|
|
// FromPemBytes loads a PEM certificate from an in memory byte array and
|
|
// returns a tls.Certificate. This function is similar to the crypto/tls
|
|
// X509KeyPair function, however it supports PEM files with the cert and
|
|
// key combined, as well as password protected keys which are both common with
|
|
// APNs certificates.
|
|
//
|
|
// Use "" as the password argument if the PEM certificate is not password
|
|
// protected.
|
|
func FromPemBytes(bytes []byte, password string) (tls.Certificate, error) {
|
|
var cert tls.Certificate
|
|
var block *pem.Block
|
|
for {
|
|
block, bytes = pem.Decode(bytes)
|
|
if block == nil {
|
|
break
|
|
}
|
|
if block.Type == "CERTIFICATE" {
|
|
cert.Certificate = append(cert.Certificate, block.Bytes)
|
|
}
|
|
if block.Type == "PRIVATE KEY" || strings.HasSuffix(block.Type, "PRIVATE KEY") {
|
|
key, err := unencryptPrivateKey(block, password)
|
|
if err != nil {
|
|
return tls.Certificate{}, err
|
|
}
|
|
cert.PrivateKey = key
|
|
}
|
|
}
|
|
if len(cert.Certificate) == 0 {
|
|
return tls.Certificate{}, ErrNoCertificate
|
|
}
|
|
if cert.PrivateKey == nil {
|
|
return tls.Certificate{}, ErrNoPrivateKey
|
|
}
|
|
if c, e := x509.ParseCertificate(cert.Certificate[0]); e == nil {
|
|
cert.Leaf = c
|
|
}
|
|
return cert, nil
|
|
}
|
|
|
|
func unencryptPrivateKey(block *pem.Block, password string) (crypto.PrivateKey, error) {
|
|
if x509.IsEncryptedPEMBlock(block) {
|
|
bytes, err := x509.DecryptPEMBlock(block, []byte(password))
|
|
if err != nil {
|
|
return nil, ErrFailedToDecryptKey
|
|
}
|
|
return parsePrivateKey(bytes)
|
|
}
|
|
return parsePrivateKey(block.Bytes)
|
|
}
|
|
|
|
func parsePrivateKey(bytes []byte) (crypto.PrivateKey, error) {
|
|
key, err := x509.ParsePKCS1PrivateKey(bytes)
|
|
if err != nil {
|
|
return nil, ErrFailedToParsePKCS1PrivateKey
|
|
}
|
|
return key, nil
|
|
}
|