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http.go
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http.go
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package main
import (
"context"
"crypto/tls"
"fmt"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"os"
"regexp"
"strings"
"time"
)
var domainRegexp = regexp.MustCompile(`^([a-zA-Z0-9][a-zA-Z0-9-]{1,61}[a-zA-Z0-9]\.)+[a-zA-Z]{2,}$`)
func mainHandler(w http.ResponseWriter, r *http.Request) {
if r.Host == config.InfoHost {
if r.URL.Path == "/ca.pem" {
w.Header().Set("Content-Type", "application/x-pem-file")
w.Write([]byte(caString))
return
}
if r.URL.Path == "/addhost" && r.Method == "POST" {
r.ParseForm()
name := r.Form.Get("name")
// Validate user input
if !domainRegexp.MatchString(name) {
http.Error(w, "Error: Invalid domain", http.StatusBadRequest)
return
}
// Add new domain to host config
config.Hosts = append(config.Hosts, HostOptions{
Name: name,
})
// Append new host to config file
f, err := os.OpenFile("config.toml", os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
log.Println(err)
w.Write([]byte("Error"))
return
}
defer f.Close()
_, err = f.WriteString(fmt.Sprintf("\n[[host]]\nname = \"%s\"\n", name))
if err != nil {
log.Println(err)
w.Write([]byte("Error"))
return
}
http.Redirect(w, r, "/", http.StatusFound)
return
}
hosts := ""
for _, host := range config.Hosts {
hosts += fmt.Sprintf("%s\n", host.Name)
}
w.Header().Set("Content-Type", "text/html")
w.Write([]byte(fmt.Sprintf(
"<pre>Welcome to %s (DNS %s:%d)\nPlease make sure to <a href=\"/ca.pem\">install<a/> the following CA:\n\n%s\n\nCurrently unlocking:\n%s</pre><br><form method=\"POST\" action=\"/addhost\"><input placeholder=\"domain.com\" required name=\"name\"><br><input type=\"submit\" value=\"Add domain\"></form>",
config.InfoHost,
*publicIP,
*dnsPort,
caString,
hosts,
)))
return
}
options := getHostOptions(r.Host)
if options == nil {
w.Write([]byte("You shall not pass!"))
return
}
newUrl, err := url.Parse(fmt.Sprintf("https://%s", r.Host))
if err != nil {
w.Write([]byte("Could not parse URL"))
return
}
proxy := httputil.NewSingleHostReverseProxy(newUrl)
director := proxy.Director
proxy.Transport = transport
proxy.Director = func(req *http.Request) {
// Use the original director to forward the request to the original host
director(req)
// pull page from google cache
if options.FromGoogleCache != nil && *options.FromGoogleCache {
log.Println("Pulling from google cache")
req.URL, _ = url.Parse(
"https://webcache.googleusercontent.com/search?q=cache:" + req.URL.String(),
)
req.Host = "webcache.googleusercontent.com"
return
}
//spoof twitter referer
if options.SocialReferer == nil || *options.SocialReferer {
req.Header.Set("Referer", "https://t.co/")
}
//spoof google bot ua
if options.GooglebotUA == nil || *options.GooglebotUA {
req.Header.Set("User-Agent", "AdsBot-Google (+http://www.google.com/adsbot.html)")
}
//spoof google bot datacenter ip
if options.GooglebotIP == nil || *options.GooglebotIP {
req.Header.Set("X-Forwarded-For", "66.102.0.0")
}
//disable cookies
if options.DisableCookies == nil || *options.DisableCookies {
req.Header.Set("Cookie", "")
req.Header.Set("Set-Cookie", "")
}
}
proxy.ModifyResponse = func(res *http.Response) error {
//remove HTST
res.Header.Set("Strict-Transport-Security", "")
contentType := res.Header.Get("Content-Type")
if !strings.HasPrefix(contentType, "text/html") {
return nil
}
b, err := decompress(res)
if err != nil {
return err
}
// Remove Google Cache Banner & Stylesheet
if options.FromGoogleCache != nil && *options.FromGoogleCache {
// TODO: Simplify this regex
re := regexp.MustCompile(
`<!doctype html>(.|\n)*?<div id="...........__google-cache-hdr">(.|\n)*?<!doctype html>`,
)
b = re.ReplaceAll(b, []byte(""))
}
// Disable JS
if options.DisableJS == nil || *options.DisableJS {
re := regexp.MustCompile(`<script(.|\n)*?<\/script>`)
b = re.ReplaceAll(b, []byte(""))
}
//Inject custom html
if options.InjectHTML != nil {
b = injectHtml(b, *options.InjectHTML)
}
//Add mitm warning banner & menu
menu, err := os.ReadFile("./menu.html")
if err != nil {
return err
}
b = injectHtml(b, string(menu))
compress(res, b)
return nil
}
proxy.ServeHTTP(w, r)
}
func injectHtml(b []byte, inject string) []byte {
re := regexp.MustCompile(`<body>|<body[^>]+>`)
locs := re.FindAllIndex(b, -1)
for _, loc := range locs {
b = append(b[:loc[1]], append([]byte(inject), b[loc[1]:]...)...)
}
//log.Println(string(b[loc[0]:loc[1]+100]))
return b
}
func serveHTTP() {
//create custom resolver that does not use our own dns
dnsResolverIP := config.UpstreamDNS
dnsResolverProto := "udp"
dnsResolverTimeoutMs := 3000
dialer := &net.Dialer{
Resolver: &net.Resolver{
PreferGo: true,
Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
d := net.Dialer{
Timeout: time.Duration(dnsResolverTimeoutMs) * time.Millisecond,
}
return d.DialContext(ctx, dnsResolverProto, dnsResolverIP)
},
},
}
transport = &http.Transport{
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
return dialer.DialContext(ctx, network, addr)
},
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
go func() {
server := &http.Server{
Addr: fmt.Sprintf(":%d", *httpPort),
Handler: http.HandlerFunc(mainHandler),
}
if err := server.ListenAndServe(); err != nil {
log.Fatalf("[ERR] %s . Terminating.", err)
}
}()
log.Printf("[HTTP] Listening on 0.0.0.0:%d/%d(tls)", *httpPort, *httpsPort)
if err := listenAndServeTLS(); err != nil {
log.Fatalf("[ERR] %s . Terminating.", err)
}
}
func listenAndServeTLS() error {
conn, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", *httpsPort))
if err != nil {
return err
}
tlsListener := tls.NewListener(conn, tlsHttpServerConfig)
server := &http.Server{Handler: http.HandlerFunc(mainHandler)}
return server.Serve(tlsListener)
}