100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
package reseed
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"fmt"
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"log"
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"math/big"
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"net"
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"os"
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"strings"
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"time"
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)
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func GenerateCert(host string, validFrom string, validFor time.Duration, isCA bool, rsaBits int) {
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if len(host) == 0 {
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log.Fatalf("Missing required -host parameter")
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}
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priv, err := rsa.GenerateKey(rand.Reader, rsaBits)
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if err != nil {
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log.Fatalf("failed to generate private key: %s", err)
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return
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}
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var notBefore time.Time
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if len(validFrom) == 0 {
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notBefore = time.Now()
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} else {
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notBefore, err = time.Parse("Jan 2 15:04:05 2006", validFrom)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to parse creation date: %s\n", err)
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return
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}
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}
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notAfter := notBefore.Add(validFor)
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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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log.Fatalf("failed to generate serial number: %s", err)
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return
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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{"I2P"},
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: x509.KeyUsageKeyEncipherment | 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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hosts := strings.Split(host, ",")
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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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if isCA {
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template.IsCA = true
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template.KeyUsage |= x509.KeyUsageCertSign
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}
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
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if err != nil {
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log.Fatalf("Failed to create certificate: %s", err)
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return
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}
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certOut, err := os.Create("cert.pem")
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if err != nil {
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log.Fatalf("failed to open cert.pem for writing: %s", err)
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return
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}
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pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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certOut.Close()
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log.Print("written cert.pem\n")
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keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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log.Print("failed to open key.pem for writing:", err)
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return
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}
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pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
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keyOut.Close()
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log.Print("written key.pem\n")
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}
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