feat: implement VPN platform management and real protocol services

backend/internal/store/store.go

@@ -0,0 +1,165 @@
+// Package store 负责 SQLite 初始化、敏感字段 AES-GCM 加密存储
+package store
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/glebarez/sqlite"
+	"golang.org/x/crypto/bcrypt"
+	"gorm.io/gorm"
+	gormlogger "gorm.io/gorm/logger"
+
+	"vpn-platform/backend/internal/model"
+)
+
+var DB *gorm.DB
+
+var gcm cipher.AEAD
+
+// Init 打开数据库、迁移、初始化加密密钥与默认账号
+func Init(dataDir string) error {
+	if err := os.MkdirAll(dataDir, 0o700); err != nil {
+		return err
+	}
+	db, err := gorm.Open(sqlite.Open(filepath.Join(dataDir, "vpn-platform.db")), &gorm.Config{
+		Logger: gormlogger.Default.LogMode(gormlogger.Warn),
+	})
+	if err != nil {
+		return fmt.Errorf("打开数据库失败: %w", err)
+	}
+	if err := db.AutoMigrate(&model.User{}, &model.LDAPConfig{}, &model.MFADevice{}, &model.VPNUser{}, &model.Tunnel{}, &model.Node{}, &model.Plugin{}, &model.AuditLog{}); err != nil {
+		return err
+	}
+	DB = db
+
+	if err := initKey(dataDir); err != nil {
+		return err
+	}
+
+	// 默认管理员 admin / admin123（首次登录后请修改） // Logan.Li
+	var count int64
+	DB.Model(&model.User{}).Count(&count)
+	if count == 0 {
+		hash, _ := bcrypt.GenerateFromPassword([]byte("admin123"), bcrypt.DefaultCost)
+		DB.Create(&model.User{Username: "admin", Password: string(hash), Role: "admin", Source: "local", Enabled: true})
+	} else {
+		// 兼容早期单管理员数据：管理员升级后保留完整管理权限。
+		DB.Model(&model.User{}).Where("username = ? AND source = ?", "admin", "local").Update("role", "admin")
+	}
+	// 内置本机节点
+	var nodeCount int64
+	DB.Model(&model.Node{}).Count(&nodeCount)
+	if nodeCount == 0 {
+		DB.Create(&model.Node{Name: "本机节点", Address: "127.0.0.1", Kind: "local", Remark: "平台所在服务器"})
+	}
+	return nil
+}
+
+func initKey(dataDir string) error {
+	keyFile := filepath.Join(dataDir, "secret.key")
+	raw, err := os.ReadFile(keyFile)
+	if err != nil {
+		key := make([]byte, 32)
+		if _, err := rand.Read(key); err != nil {
+			return err
+		}
+		raw = []byte(hex.EncodeToString(key))
+		if err := os.WriteFile(keyFile, raw, 0o600); err != nil {
+			return err
+		}
+	}
+	keyBytes, err := hex.DecodeString(string(raw))
+	if err != nil || len(keyBytes) != 32 {
+		sum := sha256.Sum256(raw)
+		keyBytes = sum[:]
+	}
+	block, err := aes.NewCipher(keyBytes)
+	if err != nil {
+		return err
+	}
+	g, err := cipher.NewGCM(block)
+	if err != nil {
+		return err
+	}
+	gcm = g
+	return nil
+}
+
+// EncryptSecret 加密敏感字符串
+func EncryptSecret(plain string) (string, error) {
+	if plain == "" {
+		return "", nil
+	}
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err := rand.Read(nonce); err != nil {
+		return "", err
+	}
+	out := gcm.Seal(nonce, nonce, []byte(plain), nil)
+	return base64.StdEncoding.EncodeToString(out), nil
+}
+
+// DecryptSecret 解密敏感字符串
+func DecryptSecret(enc string) (string, error) {
+	if enc == "" {
+		return "", nil
+	}
+	raw, err := base64.StdEncoding.DecodeString(enc)
+	if err != nil {
+		return "", err
+	}
+	if len(raw) < gcm.NonceSize() {
+		return "", fmt.Errorf("密文长度非法")
+	}
+	plain, err := gcm.Open(nil, raw[:gcm.NonceSize()], raw[gcm.NonceSize():], nil)
+	if err != nil {
+		return "", err
+	}
+	return string(plain), nil
+}
+
+// Audit 写入操作审计
+func Audit(username, action, target, detail string) {
+	if DB != nil {
+		DB.Create(&model.AuditLog{Username: username, Action: action, Target: target, Detail: detail})
+	}
+}
+
+// GetTunnel 按 ID 查询专线
+func GetTunnel(id uint) (*model.Tunnel, error) {
+	var t model.Tunnel
+	if err := DB.Preload("Node").First(&t, id).Error; err != nil {
+		return nil, err
+	}
+	return &t, nil
+}
+
+// TunnelConfig 解析专线 Config JSON
+func TunnelConfig(t *model.Tunnel) (map[string]interface{}, error) {
+	cfg := map[string]interface{}{}
+	if t.Config != "" {
+		if err := json.Unmarshal([]byte(t.Config), &cfg); err != nil {
+			return nil, err
+		}
+	}
+	return cfg, nil
+}
+
+// TunnelSecrets 解析并解密敏感字段
+func TunnelSecrets(t *model.Tunnel) (map[string]interface{}, error) {
+	out := map[string]interface{}{}
+	plain, err := DecryptSecret(t.Secrets)
+	if err != nil || plain == "" {
+		return out, nil
+	}
+	_ = json.Unmarshal([]byte(plain), &out)
+	return out, nil
+}