130 lines
2.8 KiB
Go
130 lines
2.8 KiB
Go
package selfsigned
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import (
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"bytes"
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"crypto/ecdsa"
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"crypto/ed25519"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"math/big"
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"net"
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"time"
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"forge.cadoles.com/arcad/arcast/pkg/network"
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"github.com/pkg/errors"
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)
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func NewLANKeyPair() ([]byte, []byte, error) {
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hosts, err := network.GetLANIPv4Addrs()
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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hosts = append(hosts, "127.0.0.1")
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rawCert, rawKey, err := NewCertKeyPair(hosts...)
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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return rawCert, rawKey, nil
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}
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func NewLANCert() (*tls.Certificate, error) {
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rawCert, rawKey, err := NewLANKeyPair()
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if err != nil {
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return nil, errors.WithStack(err)
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}
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cert, err := tls.X509KeyPair(rawCert, rawKey)
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if err != nil {
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return nil, errors.WithStack(err)
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}
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return &cert, nil
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}
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func NewCertKeyPair(hosts ...string) ([]byte, []byte, error) {
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priv, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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keyUsage := x509.KeyUsageDigitalSignature
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notBefore := time.Now()
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notAfter := notBefore.Add(365 * 24 * time.Hour)
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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Organization: []string{"Arcast Org"},
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: keyUsage,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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for _, h := range hosts {
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if ip := net.ParseIP(h); ip != nil {
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template.IPAddresses = append(template.IPAddresses, ip)
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} else {
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template.DNSNames = append(template.DNSNames, h)
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}
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}
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template.IsCA = true
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template.KeyUsage |= x509.KeyUsageCertSign
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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var cert bytes.Buffer
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if err := pem.Encode(&cert, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
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return nil, nil, errors.WithStack(err)
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}
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var key bytes.Buffer
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privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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if err := pem.Encode(&key, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
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return nil, nil, errors.WithStack(err)
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}
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return cert.Bytes(), key.Bytes(), nil
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}
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func publicKey(priv any) any {
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switch k := priv.(type) {
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case *rsa.PrivateKey:
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return &k.PublicKey
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case *ecdsa.PrivateKey:
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return &k.PublicKey
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case ed25519.PrivateKey:
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return k.Public().(ed25519.PublicKey)
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default:
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return nil
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}
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}
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