在 GoLang 中执行 ReverseProxy 时确认 TLS 证书

Question

在 Go 中，我正在使用 NewSingleHostReverseProxy 执行反向代理，但是我需要确认主机站点的 SSL 证书，以确保我拥有正确的安全证书...关于我应该如何执行此操作的任何想法？我应该与处理程序或传输一起执行此操作吗？我是 Go 的新手，但仍在研究它。

proxy := httputil.NewSingleHostReverseProxy(&url.URL{
         Scheme: "https",
         Host:   "sha256.badssl.com",
})

http.ListenAndServe("127.0.0.1:80", proxy)

Answer 1

要访问证书，您将可以访问 ConnectionState. The easiest way to do that is to provide your own version of DialTLS. In there you connect to the server using net.Dial，进行 TLS 握手，然后您可以自由验证。

package main

import (
    "crypto/tls"
    "log"
    "net"
    "net/http"
    "net/http/httputil"
    "net/url"
)

func main() {
    proxy := httputil.NewSingleHostReverseProxy(&url.URL{
        Scheme: "https",
        Host:   "sha256.badssl.com",
    })

    // Set a custom DialTLS to access the TLS connection state
    proxy.Transport = &http.Transport{DialTLS: dialTLS}

    // Change req.Host so badssl.com host check is passed
    director := proxy.Director
    proxy.Director = func(req *http.Request) {
        director(req)
        req.Host = req.URL.Host
    }

    log.Fatal(http.ListenAndServe("127.0.0.1:3000", proxy))
}

func dialTLS(network, addr string) (net.Conn, error) {
    conn, err := net.Dial(network, addr)
    if err != nil {
        return nil, err
    }

    host, _, err := net.SplitHostPort(addr)
    if err != nil {
        return nil, err
    }
    cfg := &tls.Config{ServerName: host}

    tlsConn := tls.Client(conn, cfg)
    if err := tlsConn.Handshake(); err != nil {
        conn.Close()
        return nil, err
    }

    cs := tlsConn.ConnectionState()
    cert := cs.PeerCertificates[0]

    // Verify here
    cert.VerifyHostname(host)
    log.Println(cert.Subject)

    return tlsConn, nil
}

Answer 2

要调整反向主机的 SSL，可以设置传输选项。所以如果你想跳过验证你可以这样设置。

proxy := httputil.NewSingleHostReverseProxy(&url.URL{
         Scheme: "https",
         Host:   "sha256.badssl.com",
})

proxy.Transport = &http.Transport{
        TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}

http.ListenAndServe("127.0.0.1:80", proxy)

在 GoLang 中执行 ReverseProxy 时确认 TLS 证书

Confirm TLS certificate while performing ReverseProxy in GoLang

ssl

reverse-proxy

go