v1.2.0: bring up to par with sclient.go; add --servername, allow pipes, use - for stdin

README.md

@@ -51,9 +51,12 @@ Usage
 =====
 
 ```bash
-sclient <remote> <local> [-k | --insecure]
+sclient [flags] <remote> <local>
 ```
 
+* flags
+  * -k, --insecure ignore invalid TLS (SSL/HTTPS) certificates
+  * --servername <string> spoof SNI (to disable use IP as &lt;remote&gt; and do not use this option)
 * remote
   * must have servername (i.e. example.com)
   * port is optional (default is 443)
@@ -79,5 +82,31 @@ sclient telebit.cloud:443 localhost:3000
 Ignore a bad TLS/SSL/HTTPS certificate and connect anyway.
 
 ```bash
-sclient badtls.telebit.cloud:443 localhost:3000 -k
+sclient -k badtls.telebit.cloud:443 localhost:3000
+```
+
+Reading from stdin
+
+```bash
+sclient telebit.cloud:443 -
+```
+
+```bash
+sclient telebit.cloud:443 - </path/to/file
+```
+
+Piping
+
+```bash
+printf "GET / HTTP/1.1\r\nHost: telebit.cloud\r\n\r\n" | sclient telebit.cloud:443
+```
+
+Testing for security vulnerabilities on the remote:
+
+```bash
+sclient --servername "Robert'); DROP TABLE Students;" -k example.com localhost:3000
+```
+
+```bash
+sclient --servername "../../../.hidden/private.txt" -k example.com localhost:3000
 ```

bin/sclient.js

@@ -1,30 +1,68 @@
 'use strict';
 
 var pkg = require('../package.json');
-var remote = (process.argv[2]||'').split(':');
-var local = (process.argv[3]||'').split(':');
+var remote;
+var local;
+var isPiped = !process.stdin.isTTY;
 var localAddress;
 var localPort;
 var rejectUnauthorized;
+var servername;
 
 function usage() {
   console.info("");
   console.info("sclient.js v" + pkg.version);
-  console.info("Usage: sclient <servername:port> <port> [-k | --insecure]");
+  console.info("Usage: sclient  [--servername <string>] [-k | --insecure] <servername:port> <port>");
   console.info("   ex: sclient whatever.com 3000");
   console.info("       (whatever.com:443 localhost:3000)");
   console.info("   ex: sclient whatever.com:4080 0.0.0.0:3000");
   console.info("");
-  process.exit(0);
 }
 
+function parseFlags() {
+  process.argv.some(function (arg, i) {
+    if (/^-k|--?insecure$/.test(arg)) {
+      rejectUnauthorized = false;
+      process.argv.splice(i, 1);
+      return true;
+    }
+  });
+  process.argv.some(function (arg, i) {
+    if (/^--?servername$/.test(arg)) {
+      servername = process.argv[i + 1];
+      if (!servername || /^-/.test(servername)) {
+        usage();
+        process.exit(2);
+      }
+      process.argv.splice(i, 2);
+      return true;
+    }
+  });
+}
+
+parseFlags();
+
+remote = (process.argv[2]||'').split(':');
+local = (process.argv[3]||'').split(':');
+
+// arg 0 is node
+// arg 1 is sclient
+// arg 2 is remote
+// arg 3 is local
+if (4 !== process.argv.length) {
+  if (isPiped) {
+    local = ['|'];
+  } else {
+    usage();
+    process.exit(1);
+  }
+}
+
+// Check for the first argument (what to connect to)
 if (!remote[0]) {
   usage();
   return;
 }
-if (!remote[1]) {
-  remote[1] = 443;
-}
 
 if (!local[0]) {
   usage();
@@ -34,24 +72,23 @@ if (local[0] === String(parseInt(local[0], 10))) {
   localPort = parseInt(local[0], 10);
   localAddress = 'localhost';
 } else {
-  localAddress = local[0];
+  localAddress = local[0]; // potentially '-' or '|'
   localPort = parseInt(local[1], 10);
 }
 
-if (!localPort) {
+if ('-' === localAddress || '|' === localAddress) {
+  // no need for port
+} else if (!localPort) {
   usage();
   return;
 }
 
-if (/^-k|--insecure$/.test(process.argv[4])) {
-  rejectUnauthorized = false;
-}
-
 var opts = {
   remoteAddr: remote[0]
 , remotePort: remote[1]
 , localAddress: localAddress
 , localPort: localPort
 , rejectUnauthorized: rejectUnauthorized
+, servername: servername
 };
 require('../')(opts);

index.js

@@ -4,7 +4,7 @@ var net = require('net');
 var tls = require('tls');
 
 function listenForConns(opts) {
-  var server = net.createServer(function (c) {
+  function pipeConn(c, out) {
     var sclient = tls.connect({
       servername: opts.remoteAddr, host: opts.remoteAddr, port: opts.remotePort
     , rejectUnauthorized: opts.rejectUnauthorized
@@ -12,7 +12,7 @@ function listenForConns(opts) {
       console.info('[connect] ' + sclient.localAddress.replace('::1', 'localhost') + ":" + sclient.localPort
         + " => " + opts.remoteAddr + ":" + opts.remotePort);
       c.pipe(sclient);
-      sclient.pipe(c);
+      sclient.pipe(out || c);
     });
     sclient.on('error', function (err) {
       console.error('[error] (remote) ' + err.toString());
@@ -20,7 +20,19 @@ function listenForConns(opts) {
     c.on('error', function (err) {
       console.error('[error] (local) ' + err.toString());
     });
-  });
+    if (out) {
+      out.on('error', function (err) {
+        console.error('[error] (local) ' + err.toString());
+      });
+    }
+  }
+
+  if ('-' === opts.localAddress || '|' === opts.localAddress) {
+    pipeConn(process.stdin, process.stdout);
+    return;
+  }
+
+  var server = net.createServer(pipeConn);
   server.on('error', function (err) {
     console.error('[error] ' + err.toString());
   });
@@ -35,10 +47,14 @@ function listenForConns(opts) {
 
 function testConn(opts) {
   // Test connection first
-  var tlsSock = tls.connect({
-    servername: opts.remoteAddr, host: opts.remoteAddr, port: opts.remotePort
+  var tlsOpts = {
+    host: opts.remoteAddr, port: opts.remotePort
   , rejectUnauthorized: opts.rejectUnauthorized
-  }, function () {
+  };
+  if (opts.servername) {
+    tlsOpts.servername = opts.servername;
+  }
+  var tlsSock = tls.connect(tlsOpts, function () {
     tlsSock.end();
     listenForConns(opts);
   });

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sclient",
-  "version": "1.0.4",
+  "version": "1.2.0",
   "description": "Secure Client for exposing TLS (aka SSL) secured services as plain-text connections locally. Also ideal for multiplexing a single port with multiple protocols using SNI.",
   "main": "index.js",
   "homepage": "https://git.coolaj86.com/coolaj86/sclient.js",