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src="https://cdn.wpsshop.cn/public/wpsshopindex/js/mid_detail_last.js?v=33890"></script><style type="text/css"></style><script type="text/javascript"></script><div class="interactive_info" id="body-data-0098" attrv="45858"></div><div class="article_box" style="overflow: hidden;"><div class="article_channel"><div class="channel_top_line"><div class="cn_t_l"></div><div class="cn_t_r"></div></div><div class="article_channel_info">当前位置: <a href="/article/list/1">article</a> > 正文 </div></div><div class="article_title"><h1>android 逆向ida,浅谈安卓逆向协议（四）- ida pro - 小红书</h1></div><div class="article_info"><div class="article_c_info"> 作者：2023面试高手 | 2024-05-30 07:28:30</div><div class="article_click" style="width: 140px;"><p class="operation-b-img operation-b-img-active"><i class="img-up txclick" attc="upclick" attn="0"></i><span class="num"> 赞</span></p><p class="operation-b-img operation-b-img-active"><i class="img-down txclick" attc="downclick" attn="0"></i><span class="num">踩</span></p></div></div><div class="article_intro">小红书逆向</div><div class="article_content article_contentheight"> <link rel="stylesheet" href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/kdoc_html_views-1a98987dfd.css"> <link rel="stylesheet" href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/ck_htmledit_views-044f2cf1dc.css"> <div id="content_views" class="htmledit_views"> <div style="font-size:16px;"> <p>文章仅提供思路，千里之行，还要靠各位自己努力，不喜勿看。</p> <p>重头戏-小红书。这是相比前几个最难的了。为什么？看下面娓娓道来。</p> <p>小红书互联网上真是没搜到解决方案，主要是sign验签和shield验签，sign签名网上有个python版，经过我验证，正确，我就没细看(2019.12.12文尾补充出来代码)。因为这几天比较忙，还没把小红书方案上线。但小红书shield，让我困扰了整整两周多，最后搞定。</p> <p>小红书做了模拟器检测，如果你是模拟器一直提示你要升级，这块我没细细研究，我直接换了真机。后来我发现了它更多的验证，绕了很多路，重刷了原生系统。不过后来我解决了native的验证，那时我才觉得，可能我不需要这么麻烦。小红书是我弄的最久的，可能接近三周，也学到了很多东西。</p> <p>小红书shield在libshield.so中。所以jdax不用搜了，浪费时间。最初我也百搜不得其姐，后来我得到了姐姐，思路就打开了。</p> <p>JAVA层：</p> <p>小红书做了Debug.isDebuggerConnected的防调试验证，xposed绕过，其他方式绕过都行。这里我采用了其他方式绕过。因为xposed我不是很精通。</p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/4a625ea8a74ebc807686ee0e4d32c7a6.png" alt="4a625ea8a74ebc807686ee0e4d32c7a6.png"></p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/b35685e73694235cb814d0d764094c34.png" alt="b35685e73694235cb814d0d764094c34.png"></p> <p>然后小红书Retrofit调用create唤起okhttp3的addInterceptor劫持再调用RedHttpInterceptor的intercept函数再调用native函数process</p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/f109cce5d824fa65aa0ce250c0b6ce57.png" alt="f109cce5d824fa65aa0ce250c0b6ce57.png"></p> <p>当然初始化native函数initializeNative在引入这个类的时候就调用了，本来想直接引入SO构造Retrofit实现获取sign，但是它上下文太强了，根本无法猜测到它到底是什么类型，传入一模一样的值进去。通过抓包发现，它在so里调用了process方法，根本不会让你在外拿到sign，所以它上下文关联和复杂，相比之前的快手、抖音、最右是最麻烦的。试了几次，抓包发现，模拟构造后发送的shield都为空。</p> <p>这时候就会发现xposed和frida在这种上下文关联太强的apk中，分析起来也比较乏力。因为参数类型太复杂。</p> <p>当然后来跟大神们交流中得知，还是有人通过xposed完成对它的模拟调用。</p> <p>NATIVE层：</p> <p>初始版的libshield.so，inline-hook技术是用不了的，因为它里面加了两层验证。验证不过就给你while(1)循环</p> <p>sub_E9AC处的"proc/%d/status"，获取"TracerPid"判断自己是否被调试</p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/2d60975543c84bd2b0111aa9f26e3d92.png" alt="2d60975543c84bd2b0111aa9f26e3d92.png"></p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/49c3bca9d36eef53747c75fddf825e73.png" alt="49c3bca9d36eef53747c75fddf825e73.png"></p> <p>为了这个，花了我一周多时间刷小米8青春的boot.img，因为我要找一个原生anroid8.1支持xposed的系统。</p> <p>但实际上并不需要这样操作，直接绕过就好了，但是既然走上了逆向的路，一定要一个完美的逆向真机系统。</p> <p>还有sub_F104处的Signature的hashCode都得绕过</p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/f3f5d459008ff15e04f0022c3970ede4.png" alt="f3f5d459008ff15e04f0022c3970ede4.png"></p> <p>最后hook-inline</p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/46b1ed0c61270034dcd8eafb42cbeb01.png" alt="46b1ed0c61270034dcd8eafb42cbeb01.png"></p> <p>最后通过对native层的hook和ida pro分析，才完成了对小红书shield的逆向。附上成功截图</p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/13b3c1939cfab4e9f6c4d3c00de2c7ed.png" alt="13b3c1939cfab4e9f6c4d3c00de2c7ed.png"></p> <p>-----------------------</p> <p>2019.12.12，最近已经在弄6.2*的版本了，新版shield基本已经过了。</p> <p>6.2*hook_inline截图</p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/e8ba4cfe3b7a367d8e305339c58c7569.png" alt="e8ba4cfe3b7a367d8e305339c58c7569.png"></p> <p>之前，有人找不到sign的算法，我把之前网上的python版本经过我的简单修正版(更满足伸手党直接测试)的贴出来。里面的deviceId、device_fingerprint、versionName、t我做了***，因为涉及我的设备信息，我不能因为共享算法把自己的设备弄封了，你们可以根据自己实际遇到的url进行操作，我在python3.7下测试过，有截图。</p> <p>import hashlib</p> <p>Arr ={"platform":"android","deviceId":"*******","device_fingerprint":"******","device_fingerprint1":"","versionName":"*****","channel":"Guanfang","sid":"","lang":"zh-Hans","t":"1575096***"};</p> <p>def md5hex(word):</p> <p>m = hashlib.md5()</p> <p>m.update(word.encode("utf-8"))</p> <p>return m.hexdigest()</p> <p>def sortedDictValues3(adict):</p> <p>keys = adict.keys()</p> <p>keys.sort</p> <p>return map(adict.get, keys)</p> <p>def get_sign(Arr):</p> <p>Str=''</p> <p>Keys=sorted(Arr.keys())</p> <p>for item in Keys:</p> <p>if item!='':</p> <p>Str=Str+item+'%3D'+Arr[item]</p> <p>deviceId=Arr['deviceId']</p> <p>v1_2 = bytearray(Str, 'utf-8')</p> <p>v5_1 = ''</p> <p>v3_2 = 0</p> <p>v2 = 0</p> <p>v4_1=bytearray(deviceId, 'utf-8')</p> <p>while v2</p> <p>算法我校验过再发的，我只能帮你们到这了，shield是逆向的一个分水岭，加油了各位</p> <p align="center"><img src="https://img-blog.csdnimg.cn/img_convert/3f5bb1c7152f001ac65edc9554362411.png" alt="3f5bb1c7152f001ac65edc9554362411.png"></p> <p>拿到签名的方式有很多例如，1：xposed的hook，2：嵌入SO调用native层函数，3：unicorn模拟arm中调用函数，4:Ida pro 逆向汇编翻译成C++等。</p> <p>android逆向交流QQ群：290081995，这个行业比较封闭，让我们共同进步。转载请保留版权。</p> </div> </div><div data-report-view="{"mod":"1585297308_001","spm":"1001.2101.3001.6548","dest":"https://blog.csdn.net/weixin_33430573/article/details/117726349","extend1":"pc","ab":"new"}"><div></div></div> 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