mirror of
https://github.com/BililiveRecorder/BililiveRecorder.git
synced 2024-11-15 19:22:19 +08:00
58ffeb3d95
Improved access source detection; added support for localhost and Loopback IPV6 access sources
176 lines
7.8 KiB
C#
176 lines
7.8 KiB
C#
using System;
|
|
using System.IO;
|
|
using System.Net;
|
|
using System.Threading.Tasks;
|
|
using Microsoft.AspNetCore.Http;
|
|
using Microsoft.Extensions.DependencyInjection;
|
|
using Microsoft.Net.Http.Headers;
|
|
|
|
namespace BililiveRecorder.Web
|
|
{
|
|
public class OpenAccessWarningMiddleware
|
|
{
|
|
private readonly RequestDelegate next;
|
|
|
|
public OpenAccessWarningMiddleware(RequestDelegate next)
|
|
{
|
|
this.next = next ?? throw new ArgumentNullException(nameof(next));
|
|
}
|
|
|
|
public Task InvokeAsync(HttpContext context)
|
|
{
|
|
if (context.RequestServices.GetService<BasicAuthCredential>() is not null)
|
|
{
|
|
// 启用了身份验证，不需要警告
|
|
return this.next(context);
|
|
}
|
|
|
|
if (sourceIpNotLan(context) || haveReverseProxyHeaders(context) || haveCustomHostValue(context))
|
|
{
|
|
context.Response.StatusCode = 412;
|
|
var accept = context.Request.Headers[HeaderNames.Accept].ToString();
|
|
if (accept.Contains("text/html"))
|
|
{
|
|
context.Response.ContentType = "text/html; charset=utf-8";
|
|
return context.Response.WriteAsync("<!DOCTYPE html><html><head><meta charset=\"utf-8\"><title>Access Denied</title></head>" +
|
|
"<body><h1>Access Denied</h1><p>Open access from the internet detected. Please enable basic authentication by setting the environment variables \"BREC_HTTP_BASIC_USER\" and \"BREC_HTTP_BASIC_PASS\", " +
|
|
"or disable this warning by setting the environment variable \"BREC_HTTP_OPEN_ACCESS\".</p>" +
|
|
"<p>检测到非局域网无密码访问。请设置使用环境变量 \"BREC_HTTP_BASIC_USER\" 和 \"BREC_HTTP_BASIC_PASS\" 设置用户名密码，" +
|
|
"或如果你已经通过其他方法实现了访问控制（如只在内网开放）可以通过设置环境变量 \"BREC_HTTP_OPEN_ACCESS\" 为任意值来禁用此警告。暴露在互联网上无密码的录播姬存在安全风险。</p>" +
|
|
"<hr><p>录播姬 BililiveRecorder " + GitVersionInformation.FullSemVer + "</p></body></html>\n");
|
|
}
|
|
else
|
|
{
|
|
context.Response.ContentType = "text/plain; charset=utf-8";
|
|
return context.Response.WriteAsync("Access Denied.\nOpen access from the internet detected. Please enable " +
|
|
"basic authentication by setting the environment variables \"BREC_HTTP_BASIC_USER\" and \"BREC_HTTP_BASIC_PASS\", " +
|
|
"or disable this warning by setting the environment variable \"BREC_HTTP_OPEN_ACCESS\".\n" +
|
|
"检测到非局域网无密码访问。请设置使用环境变量 \"BREC_HTTP_BASIC_USER\" 和 \"BREC_HTTP_BASIC_PASS\" 设置用户名密码，" +
|
|
"或如果你已经通过其他方法实现了访问控制（如只在内网开放）可以通过设置环境变量 \"BREC_HTTP_OPEN_ACCESS\" 为任意值来禁用此警告。暴露在互联网上无密码的录播姬存在安全风险。\n" +
|
|
"录播姬 BililiveRecorder " + GitVersionInformation.FullSemVer + "\n");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return this.next(context);
|
|
}
|
|
}
|
|
|
|
private static bool sourceIpNotLan(HttpContext context)
|
|
{
|
|
var ip = context.Connection.RemoteIpAddress;
|
|
if (ip is null) return true;
|
|
return
|
|
!isLocalIpv4Address(ip) && // LAN IPV4 and loopback IPV4
|
|
!isLoopbackAddress(ip) && // loopback IPV4/IPV6
|
|
!ip.IsIPv6LinkLocal && // link-local IPV6
|
|
!ip.IsIPv6UniqueLocal; // unique-local IPV6
|
|
}
|
|
|
|
private static bool isLocalIpv4Address(IPAddress ip)
|
|
{
|
|
if (ip.IsIPv4MappedToIPv6)
|
|
ip = ip.MapToIPv4();
|
|
|
|
if (ip.AddressFamily != System.Net.Sockets.AddressFamily.InterNetwork)
|
|
return false;
|
|
|
|
var bytes = ip.GetAddressBytes();
|
|
if (bytes.Length != 4)
|
|
return false;
|
|
switch (bytes[0])
|
|
{
|
|
case 10: // 10.0.0.0/8
|
|
return true;
|
|
case 127: // 127.0.0.0/8
|
|
return true;
|
|
case 172: // 172.16.0.0/12
|
|
return bytes[1] >= 16 && bytes[1] <= 31;
|
|
case 192: // 192.168.0.0/16
|
|
return bytes[1] == 168;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
private static bool isLoopbackAddress(IPAddress ip)
|
|
{
|
|
if (ip.AddressFamily is System.Net.Sockets.AddressFamily.InterNetworkV6 ||
|
|
ip.AddressFamily is System.Net.Sockets.AddressFamily.InterNetwork)
|
|
return IPAddress.IsLoopback(ip);
|
|
|
|
return false;
|
|
}
|
|
|
|
private static bool haveReverseProxyHeaders(HttpContext context)
|
|
{
|
|
return
|
|
context.Request.Headers.ContainsKey("X-Real-IP") ||
|
|
context.Request.Headers.ContainsKey("X-Forwarded-For") ||
|
|
context.Request.Headers.ContainsKey("X-Forwarded-Host") ||
|
|
context.Request.Headers.ContainsKey("X-Forwarded-Proto") ||
|
|
context.Request.Headers.ContainsKey("Via");
|
|
}
|
|
|
|
private static bool haveCustomHostValue(HttpContext context)
|
|
{
|
|
// check if the host header is set to a custom value such as a domain name
|
|
if (IPAddress.TryParse(context.Request.Host.Host, out var ip))
|
|
{
|
|
var localIP = context.Connection.LocalIpAddress;
|
|
|
|
if (localIP is null) return true;
|
|
|
|
if (localIP.IsIPv4MappedToIPv6)
|
|
localIP = localIP.MapToIPv4();
|
|
|
|
// Request.Host.Host and ip is IPV6
|
|
if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6 &&
|
|
localIP.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6)
|
|
{
|
|
// ip and localIP is Loopback IP
|
|
if (isLoopbackAddress(ip) && isLoopbackAddress(localIP))
|
|
return !ip.Equals(localIP);
|
|
|
|
return
|
|
!ip.Equals(localIP) ||
|
|
!ip.IsIPv6UniqueLocal ||
|
|
!localIP.IsIPv6UniqueLocal;
|
|
}
|
|
|
|
/*
|
|
* 判断 ip 与 localIp 是否为 LAN IP 或 保留 IP
|
|
* 1. 判断 ip 与 localIp 是否相同
|
|
* 2. 判断 ip 是否为 LAN IP 或 保留 IP
|
|
* 3. 判断 localIp 是否为 LAN IP 或 保留 IP
|
|
*/
|
|
return
|
|
!ip.Equals(localIP) ||
|
|
!isLocalIpv4Address(ip) ||
|
|
!isLocalIpv4Address(localIP);
|
|
}
|
|
|
|
// check if the host header is set to "localhost" IP address
|
|
if (context.Request.Host.Host.Equals("localhost"))
|
|
{
|
|
if (context.Connection.RemoteIpAddress is null || context.Connection.LocalIpAddress is null)
|
|
return true;
|
|
|
|
/*
|
|
* 判断是否为本机访问本机环回地址
|
|
* 1. RemoteIp 与 LocalIp 是否相同
|
|
* 2. RemoteIp 是否为本机环回地址
|
|
* 3. LocalIp 是否为本机环回地址
|
|
*/
|
|
return
|
|
!context.Connection.RemoteIpAddress.Equals(context.Connection.LocalIpAddress) ||
|
|
!isLoopbackAddress(context.Connection.RemoteIpAddress) ||
|
|
!isLoopbackAddress(context.Connection.LocalIpAddress);
|
|
}
|
|
|
|
// the host header is not an IP address
|
|
return true;
|
|
}
|
|
}
|
|
}
|