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impl.go
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/
impl.go
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// MIT License
//
// Copyright (c) 2023 TTBT Enterprises LLC
// Copyright (c) 2023 Robin Thellend <rthellend@thellend.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package impl
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/hex"
"encoding/pem"
"errors"
"fmt"
"strings"
"golang.org/x/crypto/openpgp"
pkcs12 "software.sslmate.com/src/go-pkcs12"
"github.com/c2FmZQ/tlsproxy/proxy/internal/pki/keys"
)
var (
privateKeys map[int]keyData
)
type keyData struct {
key crypto.PrivateKey
format string
password string
}
func MakeCSR(id int, keyType, format, label, dnsname, password string) ([]byte, error) {
privKey, err := keys.GenerateKey(keyType)
if err != nil {
return nil, err
}
if privateKeys == nil {
privateKeys = make(map[int]keyData)
}
privateKeys[id] = keyData{
key: privKey,
format: format,
password: password,
}
templ := &x509.CertificateRequest{
Subject: pkix.Name{CommonName: label},
}
if dnsname != "" {
templ.DNSNames = strings.Fields(strings.ReplaceAll(dnsname, ",", " "))
}
raw, err := x509.CreateCertificateRequest(rand.Reader, templ, privKey)
if err != nil {
return nil, fmt.Errorf("x509.CreateCertificateRequest: %v\n", err)
}
return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE REQUEST", Bytes: raw}), nil
}
func MakeResponse(id int, pemCert string) ([]byte, string, string, error) {
block, _ := pem.Decode([]byte(pemCert))
if block == nil || block.Type != "CERTIFICATE" {
return nil, "", "", errors.New("invalid pem certificate")
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, "", "", errors.New("invalid certificate")
}
sn := hex.EncodeToString(cert.SerialNumber.Bytes())
kd, ok := privateKeys[id]
if !ok {
return nil, "", "", errors.New("invalid id")
}
delete(privateKeys, id)
switch kd.format {
case "gpg":
b, err := x509.MarshalPKCS8PrivateKey(kd.key)
if err != nil {
return nil, "", "", fmt.Errorf("x509.MarshalPKCS8PrivateKey: %v\n", err)
}
var buf bytes.Buffer
w, err := openpgp.SymmetricallyEncrypt(&buf, []byte(kd.password), &openpgp.FileHints{FileName: sn + ".pem", ModTime: cert.NotBefore}, nil)
if err != nil {
return nil, "", "", fmt.Errorf("openpgp.SymmetricallyEncrypt: %v\n", err)
}
if err := pem.Encode(w, &pem.Block{Type: "PRIVATE KEY", Bytes: b}); err != nil {
return nil, "", "", fmt.Errorf("pem.Encode: %v\n", err)
}
if _, err := w.Write([]byte(pemCert)); err != nil {
return nil, "", "", fmt.Errorf("Write: %v\n", err)
}
if err := w.Close(); err != nil {
return nil, "", "", fmt.Errorf("Close: %v\n", err)
}
return buf.Bytes(), "application/octet-stream", sn + ".pem.gpg", nil
case "p12":
enc := pkcs12.Modern.WithIterations(250000)
p12, err := enc.Encode(kd.key, cert, nil, kd.password)
if err != nil {
return nil, "", "", fmt.Errorf("pkcs12.Encode: %v", err)
}
return p12, "application/x-pkcs12", sn + ".p12", nil
default:
return nil, "", "", errors.New("unexpected format")
}
}