From a64bc870cd70ed0f3098b0e15d054c723f05532d Mon Sep 17 00:00:00 2001
From: Gunananthaa K B <cb.en.u4cse19021@cb.students.amrita.edu>
Date: Mon, 2 May 2022 14:59:11 +0530
Subject: [PATCH] basic filtering done
---
proxy/proxy.js | 118 ++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 106 insertions(+), 12 deletions(-)
diff --git a/proxy/proxy.js b/proxy/proxy.js
index a6556dd..bcc7f2f 100644
--- a/proxy/proxy.js
+++ b/proxy/proxy.js
@@ -1,27 +1,121 @@
const http = require('http');
const PORT = 8080;
+
+const filter = request=>{
+ if(request.url==='/good'){
+ return true;
+ }
+ return false;
+}
+
const requestListener = (req,res)=>{
const options = {
hostname:'localhost',
port:3000,
path:'/'
};
- const get = http.get(options,response=>{
- console.log(`statusCode: ${response.statusCode}`);
- let buffer="";
- response.on('data',d=>{buffer+=d});
- response.on('error',err=>{console.log(`error:${err}`)});
- response.on('end',()=>{
- res.setHeader("Content-Type", "text/html");
- res.writeHead(200);
- res.end(buffer);
+ if(filter(req)){
+ const get = http.get(options,response=>{
+ console.log(`statusCode: ${response.statusCode}`);
+ let buffer="";
+ response.on('data',d=>{buffer+=d});
+ response.on('error',err=>{console.log(`error:${err}`)});
+ response.on('end',()=>{
+ res.setHeader("Content-Type", "text/html");
+ res.writeHead(200);
+ res.end(buffer);
+ });
});
- })
+ }
+ else{
+ res.setHeader("Content-Type", "text/html");
+ res.writeHead(403);
+ res.end(rejectionDisplay);
+ }
// res.writeHead(200);
- console.log(req.headers);
+ console.log(req.url);
// res.end("hello");
}
const server = http.createServer(requestListener);
-server.listen(PORT);
\ No newline at end of file
+server.listen(PORT);
+
+const rejectionDisplay = `
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html">
+<meta name="id" content="siteBlocked">
+<title>Web Site Blocked</title>
+<style type="text/css">
+#shd { width:500px;position:relative;right:3px;top:3px;margin-right:3px;margin-bottom:3px;text-align:center; }
+#shd .second,
+#shd .third,
+#shd .box { position:relative;left:-1px;top:-1px; }
+#shd .first { background: #f1f0f1; }
+#shd .second { background: #dbdadb; }
+#shd .third { background: #b8b6b8; }
+#shd .box { background:#ffffff;border:1px solid #848284;height:350px; }
+.strip { width:100%;height:70px; }
+.warn {
+background-color:#f0d44d;
+filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#fae379', endColorstr='#eed145');
+background:-webkit-gradient(linear, left top, left bottom, from(#fae379), to(#eed145));
+background:-moz-linear-gradient(top, #fae379, #eed145);
+font-size:14px;
+font-weight:bold;
+}
+#nsa_banner { position:relative;top:20px;left:20px;float:left; }
+#alert_icon { position:relative;top:15px;left:20px;float:left; }
+#alert_text { float:left;position:relative;top:25px;left:40px;width:400px; }
+</style>
+<script type="text/JavaScript">
+var isIE7=false;
+function onLoadFunc()
+{
+var s = document.URL;
+s = s.replace(/</g, "<").replace(/>/g, ">");
+if (s.length < 50) { s='URL: <b>'+s+'</b>'; }
+else { s='URL: <b>'+s.substring(0,50)+'</b>...'; }
+var o=document.getElementById("urlp");
+if (o) { o.innerHTML=s; }
+if (isIE7==true) {
+var base="http://172.17.100.100/";
+if (base.indexOf("fw_interface")>=0) {
+base="";
+}
+o=document.getElementById("nsa_banner");
+if (o) { o.src=base+"nsa_banner.gif"; }
+o=document.getElementById("alert_icon");
+if (o) { o.src=base+"alert_icon.gif"; }
+}
+}
+</script>
+</head>
+<body onload="onLoadFunc();">
+<div style="width:100%;height:100px;"></div>
+<center>
+<div id="shd"><div class="first"><div class="second"><div class="third">
+<div class="box">
+<div class="strip">
+
+<div id="alert_text">
+This site has been blocked by the network administrator.
+</div>
+</div>
+<div>
+<p id="urlp">
+</p>
+<p>
+Block reason: <b>Advanced Computer Network's Firewall</b>
+</p>
+<p>
+This is an intentionally block based on web proxy server's filter. The only allowed endpoint as per the currnet rule is '/good'
+</p>
+</div>
+</div>
+</div></div></div></div>
+</center>
+</body>
+</html>
+`;
--
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