Initial commit: OpenVPN Manager v1.0
OpenVPN Web management console with multi-instance support, client cert issuance, traffic/connection auditing, certificate expiry reminders, auto backup/restore. Stack: - Backend: Go 1.21+ (Gin + JWT) - Frontend: Vue 3 + Element Plus + ECharts + Vite - Storage: JSON file (db.json) + filesystem (pki/, instances/, clients/, backups/) Features: - Multi-instance OpenVPN management (independent port/proto/subnet/PKI) - One-click client certificate issuance with .ovpn (embedded certs) - Certificate expiry reminders (30-day threshold) - Connection log parsing (status-version 3) - Auto backup/restore (tar.gz) - Audit log for all write operations - JWT auth (12h TTL) - One-line install.sh for Ubuntu/Debian/RHEL/Fedora
This commit is contained in:
cnbugs
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package openvpn
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import (
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"bufio"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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"io"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"time"
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"openvpn-manager/internal/model"
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)
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// Manager 封装与本地 OpenVPN 的交互：生成 server.conf、生成证书、解析 status。
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// 本服务不直接以 root 启动 OpenVPN 进程（避免安全/权限问题），而是在用户机器上
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// 由 systemd / launchctl / 自定义脚本拉起。Manager 负责：
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// 1. 生成易用的 server.conf / client.ovpn / ccd
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// 2. 解析 openvpn --status 输出
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// 3. 调用 openssl/easyrsa 完成证书签发与吊销
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// 4. 提供 ping 命令检查进程可达性
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type Manager struct {
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binary string
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dataDir string
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pkiDir string
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}
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func NewManager(binary, dataDir string) *Manager {
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return &Manager{
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binary: binary,
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dataDir: dataDir,
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pkiDir: filepath.Join(dataDir, "pki"),
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}
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}
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// PKIPath 返回实例的 PKI 目录(用于存放 issued/private 等子目录)。
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func (m *Manager) PKIPath(instanceName string) string {
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return filepath.Join(m.dataDir, "instances", instanceName, "pki")
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}
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// InstanceConf 返回实例 server.conf 路径。
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func (m *Manager) InstanceConf(instanceName string) string {
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return filepath.Join(m.dataDir, "instances", instanceName, "server.conf")
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}
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// EnsureCA 初始化全局 CA。幂等。
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func (m *Manager) EnsureCA() error {
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if _, err := os.Stat(filepath.Join(m.pkiDir, "ca.crt")); err == nil {
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return nil
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}
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if err := os.MkdirAll(m.pkiDir, 0o700); err != nil {
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return err
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}
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// 使用 openssl 直接生成自签 CA，避免依赖 easyrsa
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if err := runShell(`openssl req -x509 -newkey rsa:2048 -nodes \
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-keyout "`+m.pkiDir+`/ca.key" \
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-out "`+m.pkiDir+`/ca.crt" \
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-days 3650 -subj "/CN=OpenVPN-Manager-CA" 2>/dev/null`); err != nil {
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return fmt.Errorf("generate CA: %w", err)
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}
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// DH 参数（轻量: 1024，生产可改为 2048/4096）
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if _, err := os.Stat(filepath.Join(m.pkiDir, "dh.pem")); os.IsNotExist(err) {
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if err := runShell(`openssl dhparam -out "` + m.pkiDir + `/dh.pem" 1024 2>/dev/null`); err != nil {
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return fmt.Errorf("generate DH: %w", err)
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}
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}
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// TLS-Auth key
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if _, err := os.Stat(filepath.Join(m.pkiDir, "ta.key")); os.IsNotExist(err) {
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if err := runShell(`openvpn --genkey secret "` + m.pkiDir + `/ta.key"`); err != nil {
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return fmt.Errorf("generate ta.key: %w", err)
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}
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}
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return nil
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}
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// WriteServerConf 生成 server.conf。
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func (m *Manager) WriteServerConf(in *model.Instance, extraDir string) error {
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dir := filepath.Dir(m.InstanceConf(in.Name))
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if err := os.MkdirAll(dir, 0o755); err != nil {
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return err
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}
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conf := strings.Builder{}
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conf.WriteString("# Generated by openvpn-manager at " + time.Now().Format(time.RFC3339) + "\n")
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conf.WriteString("port " + strconv.Itoa(in.Port) + "\n")
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conf.WriteString("proto " + in.Proto + "\n")
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conf.WriteString("dev " + in.Dev + "\n")
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conf.WriteString("ca " + filepath.Join(m.pkiDir, "ca.crt") + "\n")
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conf.WriteString("cert " + filepath.Join(m.PKIPath(in.Name), "issued", "server.crt") + "\n")
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conf.WriteString("key " + filepath.Join(m.PKIPath(in.Name), "private", "server.key") + "\n")
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conf.WriteString("dh " + filepath.Join(m.pkiDir, "dh.pem") + "\n")
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conf.WriteString("tls-auth " + filepath.Join(m.pkiDir, "ta.key") + " 0\n")
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conf.WriteString("topology subnet\n")
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conf.WriteString("server " + in.Subnet + "\n")
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conf.WriteString("ifconfig-pool-persist " + filepath.Join(dir, "ipp.txt") + "\n")
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conf.WriteString("keepalive 10 120\n")
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conf.WriteString("persist-key\npersist-tun\n")
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conf.WriteString("status " + filepath.Join(dir, "status.log") + " 10\n")
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conf.WriteString("status-version 3\n")
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conf.WriteString("log " + filepath.Join(dir, "logs", "openvpn.log") + "\n")
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conf.WriteString("verb 3\n")
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conf.WriteString("cipher " + orDefault(in.Cipher, "AES-256-GCM") + "\n")
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conf.WriteString("auth " + orDefault(in.AuthDigest, "SHA256") + "\n")
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if in.PushDNS != "" {
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for _, line := range strings.Split(in.PushDNS, "\n") {
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line = strings.TrimSpace(line)
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if line == "" {
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continue
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}
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conf.WriteString("push \"" + line + "\"\n")
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}
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}
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if in.PushRoutes != "" {
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for _, line := range strings.Split(in.PushRoutes, "\n") {
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line = strings.TrimSpace(line)
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if line == "" {
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continue
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}
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conf.WriteString("push \"route " + line + "\"\n")
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}
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}
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if extraDir != "" {
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conf.WriteString("client-config-dir " + extraDir + "\n")
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}
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if in.Extra != "" {
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conf.WriteString("\n# --- custom ---\n")
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conf.WriteString(in.Extra + "\n")
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}
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return os.WriteFile(m.InstanceConf(in.Name), []byte(conf.String()), 0o644)
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}
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// IssueCert 为客户端签发证书。clientName = CN。
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// 返回 (certPath, keyPath, error)。
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func (m *Manager) IssueCert(instanceName, clientName string) (string, string, error) {
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pki := m.PKIPath(instanceName)
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issuedDir := filepath.Join(pki, "issued")
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privDir := filepath.Join(pki, "private")
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certsDir := filepath.Join(pki, "certs")
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if err := os.MkdirAll(issuedDir, 0o755); err != nil {
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return "", "", err
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}
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if err := os.MkdirAll(privDir, 0o700); err != nil {
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return "", "", err
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}
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if err := os.MkdirAll(certsDir, 0o755); err != nil {
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return "", "", err
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}
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crt := filepath.Join(issuedDir, clientName+".crt")
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key := filepath.Join(privDir, clientName+".key")
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csr := filepath.Join(pki, clientName+".csr")
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// 已存在则跳过
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if _, err := os.Stat(crt); err == nil {
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return crt, key, nil
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}
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// 生成私钥
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if err := runShell(fmt.Sprintf(`openssl genrsa -out "%s" 2048 2>/dev/null`, key)); err != nil {
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return "", "", fmt.Errorf("gen key: %w", err)
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}
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// 生成 CSR
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if err := runShell(fmt.Sprintf(`openssl req -new -key "%s" -out "%s" -subj "/CN=%s" 2>/dev/null`,
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key, csr, clientName)); err != nil {
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return "", "", fmt.Errorf("gen csr: %w", err)
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}
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// 用 CA 签发
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caCrt := filepath.Join(m.pkiDir, "ca.crt")
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caKey := filepath.Join(m.pkiDir, "ca.key")
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if err := runShell(fmt.Sprintf(`openssl x509 -req -in "%s" -CA "%s" -CAkey "%s" -CAcreateserial \
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-out "%s" -days 3650 -sha256 2>/dev/null`, csr, caCrt, caKey, crt)); err != nil {
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return "", "", fmt.Errorf("sign cert: %w", err)
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}
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_ = os.Remove(csr)
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return crt, key, nil
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}
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// IssueServerCert 为实例本身签发服务端证书。
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func (m *Manager) IssueServerCert(instanceName string) error {
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_, _, err := m.IssueCert(instanceName, "server")
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return err
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}
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// RevokeCert 通过 CA 吊销证书（生成 CRL）。
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// 由于完整 CRL 链路较重，本管理器使用更简单的"禁用"模型：保留吊销标记，
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// 并通过 ccd 与 enabled=false 让 openvpn 拒绝连接。
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func (m *Manager) RevokeCert(instanceName, clientName string) error {
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_ = instanceName
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_ = clientName
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// 简化模型：不做 OpenSSL 吊销，仅通过 Store 标记 + 强制策略。
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// 真正的吊销可通过 `openssl ca -revoke` 扩展。
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return nil
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}
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// GenerateClientOVPN 生成 .ovpn 客户端配置，含内嵌证书便于分发。
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func (m *Manager) GenerateClientOVPN(in *model.Instance, username, remoteHost string) (string, error) {
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pki := m.PKIPath(in.Name)
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crt, err := os.ReadFile(filepath.Join(pki, "issued", username+".crt"))
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if err != nil {
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return "", err
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}
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key, err := os.ReadFile(filepath.Join(pki, "private", username+".key"))
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if err != nil {
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return "", err
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}
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caCrt, err := os.ReadFile(filepath.Join(m.pkiDir, "ca.crt"))
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if err != nil {
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return "", err
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}
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taKey, err := os.ReadFile(filepath.Join(m.pkiDir, "ta.key"))
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if err != nil {
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return "", err
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}
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if remoteHost == "" {
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remoteHost = "vpn.example.com"
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}
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var b strings.Builder
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b.WriteString("client\n")
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b.WriteString("dev " + in.Dev + "\n")
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b.WriteString("proto " + in.Proto + "\n")
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b.WriteString("remote " + remoteHost + " " + strconv.Itoa(in.Port) + "\n")
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b.WriteString("resolv-retry infinite\n")
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b.WriteString("nobind\n")
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b.WriteString("persist-key\npersist-tun\n")
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b.WriteString("cipher " + orDefault(in.Cipher, "AES-256-GCM") + "\n")
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b.WriteString("auth " + orDefault(in.AuthDigest, "SHA256") + "\n")
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b.WriteString("remote-cert-tls server\n")
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b.WriteString("verb 3\n")
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b.WriteString("\n<ca>\n")
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b.WriteString(string(caCrt))
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b.WriteString("\n</ca>\n")
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b.WriteString("\n<cert>\n")
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b.WriteString(string(crt))
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b.WriteString("\n</cert>\n")
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b.WriteString("\n<key>\n")
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b.WriteString(string(key))
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b.WriteString("\n</key>\n")
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b.WriteString("\n<tls-auth>\n")
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b.WriteString(string(taKey))
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b.WriteString("\n</tls-auth>\n")
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b.WriteString("key-direction 1\n")
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out := filepath.Join(m.dataDir, "clients", in.Name, username+".ovpn")
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if err := os.MkdirAll(filepath.Dir(out), 0o755); err != nil {
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return "", err
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}
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if err := os.WriteFile(out, []byte(b.String()), 0o600); err != nil {
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return "", err
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}
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return out, nil
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}
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// GenerateClientOVPNFor 是基于 VPNUser + Instance 的便捷封装。
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func (m *Manager) GenerateClientOVPNFor(u *model.VPNUser, in *model.Instance, remoteHost string) (string, error) {
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return m.GenerateClientOVPN(in, u.Username, remoteHost)
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}
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// WriteCCD 写入客户端静态配置(固定 IP 等)。
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func (m *Manager) WriteCCD(instanceName, username, body string) error {
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dir := filepath.Join(m.dataDir, "instances", instanceName, "ccd")
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if err := os.MkdirAll(dir, 0o755); err != nil {
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return err
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}
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return os.WriteFile(filepath.Join(dir, username), []byte(body+"\n"), 0o644)
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}
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// DeleteCCD 移除 ccd 文件。
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func (m *Manager) DeleteCCD(instanceName, username string) error {
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p := filepath.Join(m.dataDir, "instances", instanceName, "ccd", username)
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if err := os.Remove(p); err != nil && !os.IsNotExist(err) {
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return err
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}
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return nil
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}
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// ParseStatus 解析 openvpn --status 输出。
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// 输入是 status-version 3 的文本，格式详见 OpenVPN 文档。
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func (m *Manager) ParseStatus(path string) ([]StatusEntry, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return ParseStatusReader(f)
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}
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// StatusEntry 是 status 文件中的一条 CLIENT 记录。
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type StatusEntry struct {
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CommonName string
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RealAddress string // IP:port
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VPNAddress string // 客户端 VPN 内网 IP
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BytesRecv int64
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BytesSent int64
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ConnectedAt time.Time
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}
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var (
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reHdr = regexp.MustCompile(`^Updated,([^,]+),`)
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reCli = regexp.MustCompile(`^CLIENT_LIST,([^,]+),([^,]+),([^,]+),(\d+),(\d+),`)
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reTime = regexp.MustCompile(`^Connected Since,([^,]+),`)
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)
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func ParseStatusReader(r io.Reader) ([]StatusEntry, error) {
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sc := bufio.NewScanner(r)
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sc.Buffer(make([]byte, 64*1024), 1024*1024)
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var out []StatusEntry
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for sc.Scan() {
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line := sc.Text()
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switch {
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case strings.HasPrefix(line, "CLIENT_LIST,"):
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m := reCli.FindStringSubmatch(line)
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if m == nil {
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continue
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}
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connected, _ := time.Parse("Mon Jan 2 15:04:05 2006", m[2])
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out = append(out, StatusEntry{
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CommonName: m[1],
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RealAddress: m[3],
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VPNAddress: m[4],
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BytesRecv: atoi64(m[5]),
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BytesSent: atoi64(m[6]),
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ConnectedAt: connected,
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})
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}
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}
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return out, sc.Err()
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}
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// IsRunning 通过 TCP 探测 openvpn 端口是否可连，仅供参考。
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func (m *Manager) IsRunning(host string, port int) bool {
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addr := fmt.Sprintf("%s:%d", host, port)
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conn, err := net.DialTimeout("tcp", addr, 2*time.Second)
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if err != nil {
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return false
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}
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_ = conn.Close()
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return true
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}
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// CertNotAfter 解析证书的过期时间。
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func (m *Manager) CertNotAfter(certPath string) (time.Time, error) {
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b, err := os.ReadFile(certPath)
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if err != nil {
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return time.Time{}, err
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}
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block, _ := pem.Decode(b)
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if block == nil {
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return time.Time{}, fmt.Errorf("not a pem file")
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}
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c, err := x509.ParseCertificate(block.Bytes)
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if err != nil {
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return time.Time{}, err
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}
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return c.NotAfter, nil
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}
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// ----- helpers -----
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func runShell(s string) error {
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cmd := exec.Command("bash", "-c", s)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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return cmd.Run()
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}
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func orDefault(s, def string) string {
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if strings.TrimSpace(s) == "" {
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return def
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}
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return s
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}
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func atoi64(s string) int64 {
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n, _ := strconv.ParseInt(strings.TrimSpace(s), 10, 64)
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return n
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}
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func pemTrim(b []byte) string {
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return strings.TrimSpace(string(b))
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}
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