jcoffey
6c006e1d4d
Go backend that drives kernel WireGuard over netlink (wireguard-go as the fallback), nftables NAT with MSS clamping, forwarding and buffer sysctls, SQLite for peers, users, sessions, traffic history and the audit log. React console: dashboard with live rates and usage history, peer management with QR codes and .conf downloads, disconnect, session reset, key rotation, expiry, client-supplied keys, settings, users with admin and viewer roles, two-factor authentication with recovery codes, audit log. Docker image on Alpine with compose files for bridged and host networking, CI and GHCR publish workflows, performance notes.
81 lines
2.5 KiB
Go
81 lines
2.5 KiB
Go
package server
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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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"fmt"
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"math/big"
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"net"
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"os"
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"path/filepath"
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"time"
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)
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// loadCertificate returns the configured certificate, generating and
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// persisting a self-signed one when asked to.
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func (s *Server) loadCertificate() (tls.Certificate, error) {
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if s.cfg.TLSCert != "" {
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cert, err := tls.LoadX509KeyPair(s.cfg.TLSCert, s.cfg.TLSKey)
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if err != nil {
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return tls.Certificate{}, fmt.Errorf("load TLS certificate: %w", err)
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}
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return cert, nil
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}
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certPath := filepath.Join(s.cfg.DataDir, "tls.crt")
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keyPath := filepath.Join(s.cfg.DataDir, "tls.key")
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if cert, err := tls.LoadX509KeyPair(certPath, keyPath); err == nil {
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if leaf, err := x509.ParseCertificate(cert.Certificate[0]); err == nil && time.Now().Before(leaf.NotAfter.Add(-30*24*time.Hour)) {
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return cert, nil
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}
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}
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s.log.Info("generating a self-signed TLS certificate", "path", certPath)
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key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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return tls.Certificate{}, err
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}
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serial, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
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if err != nil {
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return tls.Certificate{}, err
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}
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host := s.eng.Settings().EndpointHost
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tmpl := &x509.Certificate{
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SerialNumber: serial,
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Subject: pkix.Name{CommonName: "WGX", Organization: []string{"WGX"}},
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NotBefore: time.Now().Add(-time.Hour),
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NotAfter: time.Now().Add(3 * 365 * 24 * time.Hour),
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KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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DNSNames: []string{"localhost"},
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IPAddresses: []net.IP{net.IPv4(127, 0, 0, 1), net.IPv6loopback},
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}
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if host != "" {
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if ip := net.ParseIP(host); ip != nil {
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tmpl.IPAddresses = append(tmpl.IPAddresses, ip)
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} else {
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tmpl.DNSNames = append(tmpl.DNSNames, host)
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}
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}
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der, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, &key.PublicKey, key)
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if err != nil {
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return tls.Certificate{}, err
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}
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keyDER, err := x509.MarshalECPrivateKey(key)
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if err != nil {
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return tls.Certificate{}, err
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}
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certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: der})
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keyPEM := pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: keyDER})
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if err := os.WriteFile(certPath, certPEM, 0o644); err != nil {
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return tls.Certificate{}, err
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}
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if err := os.WriteFile(keyPath, keyPEM, 0o600); err != nil {
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return tls.Certificate{}, err
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}
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return tls.X509KeyPair(certPEM, keyPEM)
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}
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