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certstore.go
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certstore.go
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// Copyright 2022-2023 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package certstore
import (
"crypto"
"crypto/x509"
"io"
"runtime"
"strings"
)
type StoreType int
const MATCHBYEMPTY = 0
const STOREEMPTY = 0
const (
windowsCurrentUser StoreType = iota + 1
windowsLocalMachine
)
var StoreMap = map[string]StoreType{
"windowscurrentuser": windowsCurrentUser,
"windowslocalmachine": windowsLocalMachine,
}
var StoreOSMap = map[StoreType]string{
windowsCurrentUser: "windows",
windowsLocalMachine: "windows",
}
type MatchByType int
const (
matchByIssuer MatchByType = iota + 1
matchBySubject
)
var MatchByMap = map[string]MatchByType{
"issuer": matchByIssuer,
"subject": matchBySubject,
}
var Usage = `
In place of cert_file and key_file you may use the windows certificate store:
tls {
cert_store: "WindowsCurrentUser"
cert_match_by: "Subject"
cert_match: "MyServer123"
}
`
func ParseCertStore(certStore string) (StoreType, error) {
certStoreType, exists := StoreMap[strings.ToLower(certStore)]
if !exists {
return 0, ErrBadCertStore
}
validOS, exists := StoreOSMap[certStoreType]
if !exists || validOS != runtime.GOOS {
return 0, ErrOSNotCompatCertStore
}
return certStoreType, nil
}
func ParseCertMatchBy(certMatchBy string) (MatchByType, error) {
certMatchByType, exists := MatchByMap[strings.ToLower(certMatchBy)]
if !exists {
return 0, ErrBadMatchByType
}
return certMatchByType, nil
}
func GetLeafIssuer(leaf *x509.Certificate, vOpts x509.VerifyOptions) (issuer *x509.Certificate) {
chains, err := leaf.Verify(vOpts)
if err != nil || len(chains) == 0 {
issuer = nil
} else {
issuer = chains[0][1]
}
return
}
// credential provides access to a public key and is a crypto.Signer.
type credential interface {
// Public returns the public key corresponding to the leaf certificate.
Public() crypto.PublicKey
// Sign signs digest with the private key.
Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) (signature []byte, err error)
}