sqlite-readonly-mcp

sqlite-readonly-mcp

A read-only SQLite MCP server for remote Linux deployment that provides secure database querying via SELECT statements and table listing. It uses Bearer Token authentication and returns JSON results through Streamable HTTP, designed to run behind Nginx with HTTPS.

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sqlite-readonly-mcp

在远程 Linux 上运行的 只读 SQLite Model Context Protocol 服务,使用 Streamable HTTP/mcp),由 Bearer Token 鉴权,查询结果以 JSON 文本返回。设计为置于 Nginx(HTTPS) 之后,上游仅监听本机。

功能

  • 工具 sqlite_query:单条 SELECT / WITH / EXPLAIN,返回 { rows, rowCount } 的 JSON。
  • 工具 list_tables:列出非系统表名。
  • SQLite:better-sqlite3 readonly + fileMustExist;应用层限制单语句与查询前缀。
  • GET /health:仅供回环访问,用于探针(见 src/server.ts)。
  • 传输:Streamable HTTP/mcp)+ 旧版 SSEGET /ssePOST /messages),便于 Cursor 在需要时回退。

环境变量

变量 必填 说明
SQLITE_PATH 数据库文件绝对路径
BEARER_TOKEN 静态 Bearer(也可用 READONLY_TOKEN
HOST 默认 127.0.0.1
PORT 默认 3333
ALLOWED_HOSTS 逗号分隔,允许的 Host 头;需包含 Nginx 对外域名。默认 127.0.0.1,localhost,[::1]
SQLITE_MAX_ROWS 单次查询最大行数,默认 5000

本地构建与运行

npm install
npm run build
export SQLITE_PATH=/path/to/db.sqlite
export BEARER_TOKEN='your-secret-token'
export ALLOWED_HOSTS='127.0.0.1,localhost'
node dist/server.js

开发调试:npm run dev

Nginx 与 systemd

参见 deploy/nginx.example.confdeploy/sqlite-readonly-mcp.servicedeploy/sqlite-readonly-mcp.env.example

要点:向上游传递 AuthorizationAcceptContent-Typemcp-session-id;对 SSE/分块响应关闭 proxy_buffering。示例中已包含 **/sse****/messages**(旧版 SSE 回退),与 Streamable HTTP 的 /mcp 一并反代。

以 root 用户运行(推荐示例)

为简化 SQLite 文件及父目录 的读权限配置,示例 使用 root 启动服务(systemd 单元中不设 User= / Group=,默认即为 root)。

  1. 将代码与构建产物放到例如 /opt/sqlite-readonly-mcp,并执行 npm ci --omit=devnpm run build
  2. 复制环境文件并填写变量:
 sudo cp deploy/sqlite-readonly-mcp.env.example /etc/sqlite-readonly-mcp.env
 sudo chmod 600 /etc/sqlite-readonly-mcp.env
  1. 安装并启用单元(按需修改 WorkingDirectoryExecStartnode 的绝对路径):
 sudo cp deploy/sqlite-readonly-mcp.service /etc/systemd/system/
 sudo systemctl daemon-reload
 sudo systemctl enable --now sqlite-readonly-mcp
 sudo systemctl status sqlite-readonly-mcp

若你曾自行添加 User=mcp,删除该行后再 daemon-reloadrestart

安全提示:root 进程被攻破时影响面更大,请务必配合 HTTPS、Bearer、本机监听 + Nginx、防火墙;若需最小权限,可改回专用用户并单独配置数据文件与路径权限。

手动验证(curl)

MCP 要求客户端同时接受 application/jsontext/event-stream

curl -sS -D - \
  -H "Authorization: Bearer $BEARER_TOKEN" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{},"clientInfo":{"name":"curl","version":"1.0"}}}' \
  "https://mcp.example.com/mcp"

错误 Token 应返回 401

Cursor 客户端

在 Cursor 的 MCP 设置中为该远程服务配置 HTTPS URL(例如 https://mcp.example.com/mcp)。若需 Bearer,请查阅当前 Cursor 版本是否支持为远程 MCP 配置 自定义 Header;若不支持,需在本地增加一层带固定 Authorization 的网关(见方案风险说明)。

运维

详见 docs/RUNBOOK.md

许可

MIT(与 @modelcontextprotocol/sdk 一致;以各依赖许可证为准)。

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