119 lines
3.5 KiB
Go
119 lines
3.5 KiB
Go
package configure
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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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"math/big"
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"net"
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"os"
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"path"
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"time"
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warewulfconf "github.com/warewulf/warewulf/internal/pkg/config"
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"github.com/warewulf/warewulf/internal/pkg/util"
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"github.com/warewulf/warewulf/internal/pkg/wwlog"
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)
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// TLS ensures TLS keys exist if TLS is enabled.
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// If force is true, regenerates even if keys already exist.
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// Returns true if new keys were generated.
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func TLS(force bool) (bool, error) {
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conf := warewulfconf.Get()
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if !conf.Warewulf.TLSEnabled() {
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return false, nil
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}
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keystore := path.Join(conf.Paths.Sysconfdir, "warewulf", "tls")
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keyFile := path.Join(keystore, "warewulf.key")
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certFile := path.Join(keystore, "warewulf.crt")
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if !force && util.IsFile(keyFile) && util.IsFile(certFile) {
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wwlog.Info("TLS keys already exist in %s", keystore)
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return false, nil
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}
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if err := GenTLSKeys(); err != nil {
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return false, err
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}
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wwlog.Info("TLS keys generated in %s", keystore)
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return true, nil
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}
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// GenTLSKeys generates new TLS keys and certificate unconditionally.
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func GenTLSKeys() error {
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conf := warewulfconf.Get()
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keystore := path.Join(conf.Paths.Sysconfdir, "warewulf", "tls")
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if err := os.MkdirAll(keystore, 0755); err != nil {
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return fmt.Errorf("could not create keystore directory: %w", err)
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}
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keyFile := path.Join(keystore, "warewulf.key")
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certFile := path.Join(keystore, "warewulf.crt")
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wwlog.Verbose("Generating new x509 keys in %s", keystore)
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priv, err := rsa.GenerateKey(rand.Reader, 4096)
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if err != nil {
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return fmt.Errorf("failed to generate rsa key: %w", 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 fmt.Errorf("failed to generate serial number: %w", 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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CommonName: "Warewulf Server",
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Organization: []string{"Warewulf"},
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(time.Hour * 24 * 365 * 10),
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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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if ip := net.ParseIP(conf.Ipaddr); ip != nil {
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template.IPAddresses = append(template.IPAddresses, ip)
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}
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if ip := net.ParseIP(conf.Ipaddr6); ip != nil {
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template.IPAddresses = append(template.IPAddresses, ip)
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}
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if conf.Fqdn != "" {
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template.DNSNames = append(template.DNSNames, conf.Fqdn)
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}
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template.DNSNames = append(template.DNSNames, "warewulf")
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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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return fmt.Errorf("failed to create certificate: %w", err)
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}
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keyOut, err := os.OpenFile(keyFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return fmt.Errorf("failed to open key file for writing: %w", err)
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}
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defer keyOut.Close()
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if err := pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}); err != nil {
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return fmt.Errorf("failed to write data to key file: %w", err)
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}
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certOut, err := os.OpenFile(certFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
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if err != nil {
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return fmt.Errorf("failed to open cert file for writing: %w", err)
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}
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defer certOut.Close()
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if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
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return fmt.Errorf("failed to write data to cert file: %w", err)
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}
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return nil
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}
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