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certauthority.go
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certauthority.go
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package certauthority
import (
"net"
"os"
"path/filepath"
"sync"
"time"
"github.com/square/certstrap/pkix"
)
var (
// The github.com/square/certstrap/pkix package is not thread-safe for
// certain PKI operations. In order to avoid this concern leaking out into
// consumers of this package we perform our own locking.
caLock sync.Mutex
csrLock sync.Mutex
)
type CertAuthority interface {
CAAndKey() (key string, cert string)
GenerateSelfSignedCertAndKey(string, []string, bool) (key string, cert string, err error)
}
type certAuthority struct {
depotDir string
caCert string
caKey string
}
func NewCertAuthority(depotDir, commonName string) (CertAuthority, error) {
key, cert, err := generateCAAndKey(depotDir, commonName)
if err != nil {
return nil, err
}
c := certAuthority{
depotDir: depotDir,
caCert: cert,
caKey: key,
}
return c, nil
}
func (c certAuthority) CAAndKey() (string, string) {
return c.caKey, c.caCert
}
func (c certAuthority) GenerateSelfSignedCertAndKey(commonName string, sans []string, intermediateCA bool) (string, string, error) {
key, err := pkix.CreateRSAKey(4096)
if err != nil {
return handleError(err)
}
keyBytes, err := key.ExportPrivate()
if err != nil {
return handleError(err)
}
csrLock.Lock()
csr, err := pkix.CreateCertificateSigningRequest(key, "", []net.IP{net.ParseIP("127.0.0.1")}, sans, nil, "", "", "", "", commonName)
if err != nil {
csrLock.Unlock()
return handleError(err)
}
csrLock.Unlock()
caBytes, err := os.ReadFile(c.caCert)
if err != nil {
return handleError(err)
}
ca, err := pkix.NewCertificateFromPEM(caBytes)
if err != nil {
return handleError(err)
}
caKeyBytes, err := os.ReadFile(c.caKey)
if err != nil {
return handleError(err)
}
caKey, err := pkix.NewKeyFromPrivateKeyPEM(caKeyBytes)
if err != nil {
return handleError(err)
}
caLock.Lock()
var crt *pkix.Certificate
if intermediateCA {
crt, err = pkix.CreateIntermediateCertificateAuthorityWithOptions(ca, caKey, csr, time.Now().AddDate(1, 0, 0), pkix.WithPathlenOption(1, false))
} else {
crt, err = pkix.CreateCertificateHost(ca, caKey, csr, time.Now().AddDate(1, 0, 0))
}
if err != nil {
caLock.Unlock()
return handleError(err)
}
caLock.Unlock()
crtBytes, err := crt.Export()
if err != nil {
return handleError(err)
}
keyFile, err := os.CreateTemp(c.depotDir, commonName)
if err != nil {
return handleError(err)
}
defer keyFile.Close()
err = os.WriteFile(keyFile.Name(), keyBytes, 0655)
if err != nil {
return handleError(err)
}
crtFile, err := os.CreateTemp(c.depotDir, commonName)
if err != nil {
return handleError(err)
}
defer crtFile.Close()
err = os.WriteFile(crtFile.Name(), crtBytes, 0655)
if err != nil {
return handleError(err)
}
return keyFile.Name(), crtFile.Name(), nil
}
func generateCAAndKey(depotDir, commonName string) (string, string, error) {
caKey, err := pkix.CreateRSAKey(4096)
if err != nil {
return handleError(err)
}
caLock.Lock()
ca, err := pkix.CreateCertificateAuthority(caKey, "", time.Now().AddDate(1, 0, 0), "", "", "", "", commonName, nil)
if err != nil {
caLock.Unlock()
return handleError(err)
}
crtKey, err := pkix.CreateRSAKey(4096)
if err != nil {
return handleError(err)
}
csr, err := pkix.CreateCertificateSigningRequest(crtKey, "", nil, nil, nil, "", "", "", "", commonName)
if err != nil {
return handleError(err)
}
crt, err := pkix.CreateIntermediateCertificateAuthorityWithOptions(ca, caKey, csr, time.Now().AddDate(1, 0, 0), pkix.WithPathlenOption(1, false))
if err != nil {
caLock.Unlock()
return handleError(err)
}
caLock.Unlock()
crtBytes, err := crt.Export()
if err != nil {
return handleError(err)
}
keyBytes, err := crtKey.ExportPrivate()
if err != nil {
return handleError(err)
}
keyFile := filepath.Join(depotDir, commonName+".key")
err = os.WriteFile(keyFile, keyBytes, 0655)
if err != nil {
return handleError(err)
}
crtFile := filepath.Join(depotDir, commonName+".crt")
err = os.WriteFile(crtFile, crtBytes, 0655)
if err != nil {
return handleError(err)
}
return keyFile, crtFile, nil
}
func handleError(err error) (string, string, error) {
return "", "", err
}