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至顶网安全频道浅谈Javascript函数劫持

浅谈Javascript函数劫持

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本文给出了Javascript函数劫持的三种实现方式和反劫持的内容,供大家参考!

作者:luoluo 来源:Xfocus Team   2008年9月9日

关键字: Javascript函数劫持 DOS/DDOS

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在本页阅读全文(共2页)

  3、不是上面两个问题都解决了吗,为什么要有第3节?因为那不是个最好的解决办法,既然我们可以创建全新的iframe,何不把代码直接放到全新iframe里执行呢,这样做的话绿色环保,既不用考虑当前context里的hook问题,也不用改动当前context,不会影响本身的程序执行。给出两个比较通用点的函数:

  function createIframe(w) {

  var d = w.document;

  var newIframe = d.createElement("iframe");

  newIframe.style.width = 0;

  newIframe.style.height = 0;

  d.body.appendChild(newIframe);

  newIframe.contentWindow.document.write("");

  return newIframe;

  }

  function injectScriptIntoIframe(f, proc) {

  var d = f.contentWindow.document;

  var s = "";

  d.write(s);

  }

  把你的payload封装进一个函数,然后调用这两个方法来在iframe里执行:

  function payload() {

  // your code goes here

  }

  var f = createIframe(top);

  injectScriptIntoIframe(f, payload);

  四、最后

  由于国内很少有见文章提及这个东西,所以才草成这篇,希望能够抛砖引玉。由于本人水平有限,难免有错误或者疏漏之处请谅解,没有说清楚的地方,欢迎和我交流。

  五、附录

  [1]简易的javascript inline debugger代码

  <!--test.htm-->

  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

  <html xmlns="http://www.w3.org/1999/xhtml">

  <head><title>Javascript Inline Debugger</title></head>

  <body>

  <script language="javascript" type="text/javascript"

src="js_inline_debugger.js">  src="js_inline_debugger.js"></script>

  <input type="button" value="hahaha" onclick="javascript: alert(this.value);"

style="margin-left: 300px;" />  style="margin-left: 300px;" />

  </body>

  </html>

  /*

  FileName: js_inline_debugger.js

  Author: luoluo

  Contact: luoluonet_at_yahoo.cn

  Date: 2007-6-27

  Version: 0.1

  Usage:

  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

  <html xmlns="http://www.w3.org/1999/xhtml">

  <head>

  </head>

  <body>

  <script language="javascript" type="text/javascript"

src="js_inline_debugger.js">  src="js_inline_debugger.js"></script>

  </body>

  </html>

  Instruction:

  It is a simple javascript inline debugger. You must

  add xhtml1-transitional dtd to your

  html document if you wanna to use the script.

  */

  //--------------------------------------------------------------------------//

  // 公用的函数

  //--------------------------------------------------------------------------//

  // 判断是否是IE

  function isIE() {

  return document.all &&window.external;

  }

  // 去除字符串两边的空格

  String.prototype.trim = function() {

  var re = /(^\s*)|(\s*)$/g;

  return this.replace(re, "");

  }

  // 删除数组中某个元素

  Array.prototype.remove = function(i) {

  var o = this[i];

  for (var j = i; j <this.length - 1; j ++) {

  this[j] = this[j + 1];

  }

  -- this.length;

  return o;

  }

  // 判断一个数组中是否存在相同的元素

  Array.prototype.search = function(o) {

  for (var i = 0; i <this.length; i ++) {

  if (this[i] == o) {

  return i;

  }

  }

  return -1;

  }

  // html编码

  function htmlEncode(s) {

  s = s.replace(/&/g, "&");

  s = s.replace(/</g, "<");

  s = s.replace(/>/g, ">");

  s = s.replace(/\"/g, """);

  s = s.replace(/\'/g, """);

  return s;

  }

  // js编码

  function jsEncode(s) {

  s = s.replace(/\\/g, "\\\\");

  s = s.replace(/\n/g, "\\n");

  s = s.replace(/\"/g, "\\\"");

  s = s.replace(/\'/g, "\\\'");

  return s;

  }

  //--------------------------------------------------------------//

  // 命令行窗口工具

  //--------------------------------------------------------------//

  function Console(parentNode, processInputProc) {

  // 窗口

  var panel = document.createElement("div");

  panel.style.width = "250px";

  panel.style.height = "250px";

  panel.style.borderColor = "#666666";

  panel.style.borderWidth = "1px";

  panel.style.backgroundColor = "#ffffff";

  panel.style.borderStyle = "solid";

  panel.style.position = "absolute";

  panel.style.zIndex = 100;

  parentNode.appendChild(panel);

  // 标题栏

  var title = document.createElement("div");

  title.style.width = "250px";

  title.style.height = "15px";

  title.style.backgroundColor = "#dddddd";

  title.style.fontSize = "12px";

  title.style.fontFamily = "verdana,tahoma";

  panel.appendChild(title);

  // 标题栏拖动窗口功能

  var isDragging = false;

  var startPos = new Position(panel.offsetLeft, panel.offsetTop);

  var startMousePos = new Position(0, 0);

  title.onmouseover = function(evt) {

  this.style.cursor = "pointer";

  }

  title.onmousedown = function(evt) {

  if (isDragging == true) {

  return;

  }

  var event = evt || window.event;

  startMousePos.x = event.clientX;

  startMousePos.y = event.clientY;

  isDragging = true;

  }

  title.onmousemove = function(evt) {

  if (isDragging == false) {

  return;

  }

  activateWindow();

  var event = evt || window.event;

  panel.style.left = (event.clientX - startMousePos.x) + startPos.x + "px";

  panel.style.top = (event.clientY - startMousePos.y) + startPos.y + "px";

  }

  title.onmouseup = function(evt) {

  if (isDragging == false) {

  return;

  }

  var event = evt || window.event;

  startPos.x = (event.clientX - startMousePos.x) + startPos.x;

  panel.style.left = startPos.x + "px";

  startPos.y = (event.clientY - startMousePos.y) + startPos.y;

  panel.style.top = startPos.y + "px";

  isDragging = false;

  }

  // 关闭窗口功能

  var closeButton = document.createElement("div");

  closeButton.style.width = "13px";

  closeButton.style.height = "13px";

  closeButton.style.backgroundColor = "#ffffff";

  closeButton.style.styleFloat = closeButton.style.cssFloat = "left";

  closeButton.style.fontSize = "12px";

  closeButton.style.borderWidth = "1px";

  closeButton.style.borderColor = "#999999";

  closeButton.style.borderStyle = "solid";

  closeButton.style.paddingButton = "2px";

  closeButton.innerHTML = "<div style=\"margin-top: -2px;margin-left: 3px;\">x</div>";

  title.appendChild(closeButton);

  var isVisible = true;

  // 窗口关闭

  closeButton.onclick = function(evt) {

  isVisible = false;

  panel.style.display = "none";

  }

  // 标题栏文字

  var titleLabel = document.createElement("div");

  titleLabel.style.height = "14px";

  titleLabel.style.width = "200px";

  titleLabel.style.fontSize = "11px";

  titleLabel.style.color = "#ffffff";

  titleLabel.style.styleFloat = titleLabel.style.cssFloat = "left";

  titleLabel.style.fontFamily = "verdana,tahoma";

  titleLabel.innerHTML = "Javascript Inline Debugger";

  //titleLabel.style.marginTop = isIE() ? -14 : "-14px";

  titleLabel.style.marginLeft = isIE() ? 18 : "18px";

  title.appendChild(titleLabel);

  // 中间的显示部分

  var showPanel = document.createElement("div");

  showPanel.style.width = "250px";

  showPanel.style.height = isIE() ? "221px" : "219px";

  showPanel.style.fontSize = "11px";

  showPanel.style.padding = "0";

  showPanel.style.margin = "0";

  showPanel.style.overflow = "auto";

  showPanel.style.marginTop = isIE() ? -1 : "0";

  panel.appendChild(showPanel);

  // 命令输入框

  var cmdArea = document.createElement("div");

  panel.appendChild(cmdArea);

  var cmdTextbox = document.createElement("input");

  cmdTextbox.type = "text";

  cmdTextbox.style.width = "250px";

  cmdTextbox.style.height = "12px";

  cmdTextbox.style.fontSize = "12px";

  cmdTextbox.style.padding = "0";

  cmdTextbox.style.margin = "0";

  cmdTextbox.style.marginTop = isIE() ? -2 : "0";

  cmdTextbox.style.borderWidth = "0";

  cmdTextbox.style.borderTopWidth = "1px";

  cmdTextbox.style.paddingTop = "2px";

  cmdArea.appendChild(cmdTextbox);

  // 窗口激活或者不激活

  var isActive = false;

  // 激活窗口

  var activateWindow = function() {

  if (! isVisible) {

  return;

  }

  if (isActive) {

  return;

  }

  cmdTextbox.focus();

  title.style.backgroundColor = "#015DF4";

  isActive = true;

  }

  panel.onclick = activateWindow;

  // 不激活窗口

  var deactivateWindow = function() {

  if (! isVisible) {

  return;

  }

  if (! isActive) {

  return;

  }

  title.style.backgroundColor = "#cccccc";

  isActive = false;

  }

  cmdTextbox.onfocus = activateWindow;

  cmdTextbox.onblur = deactivateWindow;

  // 输出函数

  var dbgPrint = function(s) {

  showPanel.innerHTML += htmlEncode(s).replace(/\n|(\r\n)/g, "<br />");

  if (parseInt(showPanel.scrollHeight) >parseInt(showPanel.style.height)) {

  showPanel.scrollTop += parseInt(showPanel.scrollHeight) -

  parseInt(showPanel.style.height);

  }

  }

  // 调用输入处理回调函数

  cmdTextbox.onkeydown = function(evt) {

  var event = evt || window.event;

  if (event.keyCode == 0x0d) {

  processInputProc(this.value, dbgPrint);

  this.value = "";

  }

  }

  }

  // 坐标类

  function Position(x, y) {

  this.x = x;

  this.y = y;

  }

  //--------------------------------------------------------------------------//

  // 内联调试器类

  //--------------------------------------------------------------------------//

  function InlineDebugger() {

  var bpList = new Array();

  var id_eval;

  // 设置断点

  var bp = function(funcName) {

  // 检查eval是否被hook

  if ((new String(eval)).indexOf("[native code]") <0) {

  return "error: eval function was hooked by other codes in the front.\n";

  }

  // 保存未被hooked的eval

  id_eval = eval;

  var re = /^[a-zA-Z0-9_\.]+$/i;

  if (! re.test(funcName)) {

  return "error: bad argument of command bp \"" + funcName + "\".\n";

  }

  try {

  id_eval("if (typeof(" + funcName + ") == \"object\" ||

  typeof(" + funcName + ") == \"function\") {var obj = " + funcName + ";}");

  } catch (e) {

  return "error: " + e + ", invalid function name \"" + funcName + "\".\n";

  }

  if (obj == undefined) {

  return "error: the argument of command bp \"" + funcName +

  "\" is not a function object.\n";

  }

  if ((new String(obj)).indexOf("function") <0) {

  return "error: the argument of command bp \"" + funcName +

  "\" is a property, a function is required.\n";

  }

  if (bpList.search(funcName) >= 0) {

  return "error: there is a breakpoint on function \"" + funcName + "\"\n";

  }

  try {

  var sc = "window." + funcName.replace(/\./g, "_") + "_bak = " + funcName + ";\n" +

  funcName + " = " +

  "function() {\n" +

  " var args = \"\";\n" +

  " for (var i = 0; i <arguments.length; i ++) {\n" +

  " args += arguments[i] + (i == (arguments.length - 1) ?

  \"\" : \",\");\n" +

  " }\n" +

  " if (confirm(\"function \\\"" + funcName +

  "\\\" was called, execute it?\\n\\narguments:\\n\" + args +

  \"\\n\\ncaller:\\n\" + " + funcName + ".caller)) {\n" +

  " id_eval(\"" + funcName.replace(/\./g, "_") +

  "_bak(\\\"\" + jsEncode(args) + \"\\\")\");\n" +

  " }\n" +

  "};" +

  "\n";

  id_eval(sc);

  bpList.push(funcName);

  return "* breakpoint on function \"" + funcName + "\" added successfully.\n";

  } catch (e) {

  return "unkown error: " + e + ".\n";

  }

  }

  // 枚举所有的断点

  var bl = function() {

  if (bpList.length == 0) {

  return "* no breakpoint.\n";

  }

  var bps = "* " + bpList.length + " breakpoints: \n";

  for (var i = 0; i <bpList.length; i ++) {

  bps += i + " - " + bpList[i] + "\n";

  }

  return bps;

  }

  // 清除某个断点

  var bc = function(n) {

  try {

  n = parseInt(n);

  } catch (e) {

  return "error: bc command requires a numeric argument.\n";

  }

  if (bpList.length == 0) {

  return "error: no breakpoint.\n";

  }

  var funcName = bpList.remove(n);

  try {

  eval(funcName + " = window." + funcName.replace(/\./g, "_") + "_bak;");

  return "* breakpoint on function \"" + funcName + "\" deleted successfully.\n";

  } catch (e) {

  return "error: " + e + ".\n";

  }

  }

  // 帮助

  var help = function() {

  var s = "debug commands:\n\n" +

  "bp <function name> - set a breakpoint on a function,

  e.g. \"bp window.alert\".\n" +

  "bl - list all breakpoints.\n" +

  "bc <breakpoint number> - remove a breakpoint by

  specified number, e.g. \"bc 0\".\n" +

  "help - help information.\n"

  "\n";

  return s;

  }

  // 处理命令

  this.exeCmd = function(cmd) {

  cmd = cmd.trim();

  var cmdParts = cmd.split(/\s+/g);

  var cmdName;

  var cmdArg;

  if (cmdParts.length == 1) {

  cmdName = cmd;

  } else {

  cmdName = cmdParts[0];

  cmdArg = cmdParts[1];

  }

  switch (cmdName) {

  case "bp":

  if (cmdArg == undefined) {

  return "error: bp command requires an argument.\n";

  } else {

  return bp(cmdArg);

  }

  break;

  case "bl":

  return bl();

  break;

  case "bc":

  if (cmdArg == undefined) {

  return "error: bc command requires an argument \"number of breakpoint\".\n";

  } else {

  return bc(cmdArg);

  }

  break;

  case "help":

  return help();

  break;

  default: return "error: command \"" + cmdName + "\" not found,

  you can get information by \"help\" command.\n";

  break;

  }

  }

  }

  //-----------------------------------------------------------------------------//

  // 主过程

  //-----------------------------------------------------------------------------//

  /*try {

  debugger;

  } catch (e) {}*/

  var id = new InlineDebugger();

  var console = new Console(document.body, function(s, printProc){printProc(id.exeCmd(s));});

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