85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
package selfcert
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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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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)
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func NewTLSConfig(hosts []string) (*tls.Config, error) {
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priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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return nil, 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, err
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}
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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{"Acme Co"},
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(10 * 365 * 24 * time.Hour),
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KeyUsage: x509.KeyUsageDigitalSignature,
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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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certBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
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if err != nil {
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return nil, err
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}
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certPem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certBytes})
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keyBytes, err := x509.MarshalPKCS8PrivateKey(priv)
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if err != nil {
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return nil, err
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}
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keyPem := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: keyBytes})
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cert, err := tls.X509KeyPair(certPem, keyPem)
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if err != nil {
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return nil, err
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}
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conf := &tls.Config{
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Certificates: []tls.Certificate{cert},
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MinVersion: tls.VersionTLS13,
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NextProtos: []string{"h2"},
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}
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return conf, nil
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}
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func NewTLSConfigFromHostPort(hostport string) (*tls.Config, error) {
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host, _, err := net.SplitHostPort(hostport)
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if err != nil {
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return nil, err
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}
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return NewTLSConfig([]string{host})
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}
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