js逆向 - 某电商网站 fingerprint 参数

本文仅供学习交流，只提供关键思路不会给出完整代码，严禁用于非法用途，若有侵权请联系我删除！

目标网站：aHR0cHM6Ly93d3cuamQuY29tLw==

目标接口：Cmh0dHBzOi8vYXBpLm0uamQuY29tLz9hcHBpZD1pdGVtLXYz

接上一篇：JD - h5st解析_小馒头yy的博客-CSDN博客文章中提到一个fp参数，是由JS生成的。

一、分析

fp 很容易联想到 fingerprint （别问为什么，都是靠猜，然后调试验证），我们全局搜索 fingerprint，定位到关键位置：

将后面那段关键代码执行，每次得到的值都不一样，猜测是随机函数。将这些生成的值放到代码中执行，都是可以用的！

跟进去调试，跟到 t(n, r)这个方法，入参都是明文。那我们只需要把 t 这个方法补全就好了。

二、补环境

1、继续跟进去，把涉及到的方法全部抠出来，把环境补全。

2、有些地方需要根据调试得到的值做一定的修改，比如下方这个方法，根据当前断点的值应当修改为：

        var t = ["CMHryLC", "mtC1ndC4nhDsAgjuCW", "y0fXtMm", "teDnC3m", "mdeYmZq1nJC4oq", "vhHJueq", "yLLZvu8", "ugfMCu8", "CfD2Aha", "Cg9W", "BKngCve", "AgHjrNu", "mtaYmdzTEureA0e", "uK1dy3C", "qvLuB0G", "vwLLt2u", "wwr6q2e", "Dg9tDhjPBMC", "DwftqwO", "nhWWFdn8mNWX", "ELPoANi", "zMvOD0y", "D2XuD0m", "vvr3DM4", "y2fSBa", "tM9Vs04", "A0vksgu", "AM9PBG", "tNDhq1u", "s2X2A2O", "mxWZFdb8nxWYFa", "DMuGysbBu3LTyG", "v1vvq1a", "Cxrov3K", "BwHwyu0", "uKLKBLe", "tw1Iu2e", "ywvkqwe", "C3nVB0K", "vvjWs2m", "BNvTyMvY", "uvvtvgO", "D1vqD1G", "vhnvC1G", "uu1zre0", "BKDPvvq", "C05qu3a", "nevQDu91AW", "z1n2zwC", "Dgfgthu", "C3n2BMm", "ugH5A3O", "CMv0DxjU", "zg9Uzq", "zMniruO", "zKrrALi", "DvD6tLe", "uLHRz1y", "qxjkCei", "y29UC3rYDwn0BW", "DxzRuuO", "CuD0uNG", "ENHTzg8", "rgHiyNa", "qK9KtKC", "C3bSAxq", "tNvbBe0", "rM1izK4", "yuX4yuW", "DffpAfK", "v01Wr0S", "tNvUt3m", "tM1XELe", "tLDjq24", "CfvgChC", "zwrosvq", "Aw5KzxHpzG", "BfLizxK", "wMXxDeG", "wxb4zei", "uNHdALa", "ugLVEKK", "C2v0u3LUyW", "Bfvtsw0", "tLr4C2O", "nhW1Fdn8mxWYFa", "qxjNDw1LBNrZ", "CfvJwgu", "Ahrgr1G", "yMXLlcbUB24Tyq", "vvr1shy", "BgvUz3rO", "u2ftEKm", "DhmGBxvZDcbOyq", "ve9XsgK", "zLjiCgq", "ChvZAa", "CxHvsg4", "AxrLCMf0B3i", "Ahf2zLK", "v3biwgW", "nJiYmJC4meDVtxnSEG", "AejNBg4", "mtq5nJvKz01jqKm", "Fde0FdeXFdv8mq", "v21Ts1a", "rwnpzeW", "rfbwq0G", "BMfTzq", "CLbcsMC", "zffor1m", "DgvTChqGDg8GAq", "AfLiBgW", "z2frDeC", "mtmZmdrjDMfNC3G", "ugHet0u", "Bgfqsgy", "zvLvrvK", "EvHAB1m", "A01Sv08", "CMfUzg9T", "tMH6BxG", "DgvYyxrLig5VBG", "A3DgrKq", "ChjVDg90ExbL", "t2jQzwn0", "Dw5KzwzPBMvK", "s1zjshy", "BM5HCfe", "BMjvqMy", "DgvZDa", "u3HkA1y", "vxPor0q", "uMHdy1u", "ndyWnZmZs3POruLc", "B051veq", "ywLwvwy", "thHTAMG", "C2nbzMC", "BwD4q2C", "uu1Jzge", "y0TyB1K", "DgrPwe8", "tLDwq1q", "DgD5C2S", "EuzLDgS", "mJGZmLnODKnezW", "Aw5ZDgfUy2uUcG", "C3rYAw5N", "suXPuvy", "D291wNa", "DKX4tgu", "DM9PqKm", "BMLSv2i", "rLHtyLi", "EKneDuG", "AxnbCNjHEq", "EgvZugW", "v0zSqvC", "zNjVBq", "B0Xlu1G", "mxW0Fdv8mNWZFa", "DMfSDwu", "mte3oduXmwf2CwrxzG", "Fdf8nxWWFdeYFa", "u2v0", "C2L6zq", "z1HRwLq", "wMTstNG", "CNjHEsbVyMPLyW", "CL0OksbTzxrOBW", "wMPsz1u", "A2T5uvq", "s3vHsNe", "zxHWAxjL", "ywvAChy", "wuXYwMi", "uxvICeG", "mtn8mG", "uKLUCve", "CMvWBgfJzq", "BMXJBM8", "AgnSqNK", "ANLnsfK", "Dezfwvq", "wLnKt0i", "uuDKqMS", "C2XPy2u", "ueT2AuO", "B3bHz0e", "swD1yve", "BNvT", "tKTYBgy", "veDHyu4", "Bvvtv1i", "uhrQwwy", "vuLuCgi", "zuz3u20", "D3zODve", "AMLQu28", "BMv4Da", "sMDbvhm", "BLLWvfu", "y0XwBMW", "sw4GB3jKzxiGDa", "zhzxwLm", "t21NENe", "uKH5s1m", "q3jHwvy", "sKLmB0K", "twfW", "CNDUD3i", "sw52ywXPzcbHDa", "nJm0otbIDhn4r1q", "sKfUyK8", "vfzOzwq"];

3、抠代码中发现有依赖到 window。这里我们用JSDOM 补全

const jsdom = require("jsdom");const {JSDOM} = jsdom;// const dom = new JSDOM(`<!DOCTYPE html><p>Hello world</p>`);
const dom = new JSDOM(``, {url: "https://www.jd.com/?from=pc_item_sd",referrer: "https://www.jd.com/",contentType: "text/html",includeNodeLocations: true,storageQuota: 10000000
});window = dom.window

环境都补完后，直接运行 cr('vk1_fb5df', 'dy_tk_s_fb5df'); 就能生成该fp值

4、暴力求解：我们在补充环境时，发现 cr 这个方法依赖到特别多的方法，我足足扣了半个小时才补全代码，纯纯苦力活。这时候我们也可以暴力一点，把整个文件复制下来，然后在文件中的合适位置去执行 cr 方法后，得到结果直接return ，例：

那么，我们在外部调用的时候，只需要执行外部方法 ParamsSign 就能直接得到结果。生成的值亲测可用。

let res = ParamsSign()
console.log("result: " + res)

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","stockDesc":"<strong>有货</strong>","dcashDesc":"在线支付免运费 <a title=\"了解配送费收取标准\" href=//help.jd.com/user/issue/109-4012.html target=\"_blank\"><i class=\"sprite-question\"></i></a>","fxgCode":"0","is7ToReturn":"支持7天无理由退货","stockState":33,"stockInfo":{"date":"","freshEdi":0,"railModel":0,"sidDely":-1,"availableNum":-1,"rid":0,"stDely":-1,"useStockNum":99,"stockState":"AVAILABLE","stockV":0,"dcId":-1,"preStore":-1,"dcIdDely":-1,"storeState4Dada":-1,"ca":-1,"ef":0,"storeType":-1,"eh":-1,"ae":0,"stockM":0,"ej":"-1","ag":"-1","ek":-1,"ah":-1,"storeId":-1,"storeId4Dada":-1,"siteId4Dada":-1,"at":"-1","popPatType":-1,"reservationType":"OTHER","businessType":-1},"supportHKMOShip":true,"serverIcon":{"relaxType":0,"wlfwIcons":[],"basicIcons":[{"sortId":3,"iconType":"right","imageUrl":"https://m.360buyimg.com/cc/jfs/t4984/195/1172610074/2110/e12abb06/58ede3e4Nfc650507.png","jichu":false,"show":true,"tip":"支持港澳台及海外收货地址下单，由于各地区政策不同，具体请以结算页详情为准","text":"可配送全球","jdPostAndService":false},{"helpLink":"/","code":"pop_wfp","sortId":7,"iconType":"right","imageUrl":"https://img12.360buyimg.com/ling/jfs/t1/97934/37/15227/438/5e7039a8Eb47e1b68/1aff43e2aaa0b2d8.png","jichu":false,"show":true,"tip":"京东为您提供晚发赔保障，若发货超承诺时效，商家将会赔偿您300个京豆（实付金额≤3元、特殊商品、特殊服务及不可抗力因素不赔付）","text":"晚发赔","jdPostAndService":false},{"helpLink":"https://b.jr.jd.com/insurance_service/privileges/#/ensure?sku=10056328583143","code":"service_shangjiazx","sortId":7,"iconType":"right","imageUrl":"http://m.360buyimg.com/cc/jfs/t27457/94/173182/921/1ea5c22b/5b7fbd22N071fe0dd.png","jichu":false,"show":true,"tip":"该商品已由保险公司承保","text":"特权保障","jumpUrl":"https://b.jr.jd.com/insurance_service/privileges/#/ensure?sku=10056328583143","jdPostAndService":false},{"helpLink":"https://help.jd.com/user/issue/962-4181.html","code":"pop_15tjbx","sortId":7,"iconType":"right","imageUrl":"https://img01.az.jd.com/ins-jx/images/jx_icon.png","jichu":false,"show":true,"tip":"此商品支持15天价保，下单15天内商品发生降价可申请价格保护","text":"15天价保险","jdPostAndService":false},{"helpLink":"http://help.jd.com/user/issue/290-3714.html","code":"service_popshantui","sortId":7,"iconType":"right","imageUrl":"http://m.360buyimg.com/cc/jfs/t9070/350/2223643937/1717/3269e00a/59c90260N943c64d9.png","jichu":false,"show":true,"tip":"闪电退款是为京东优质会员提供的快速退款服务","text":"闪电退款","jumpUrl":"https://tuihuan.jd.com/afs/help/mirror4POP","jdPostAndService":false},{"helpLink":"https://help.jd.com/user/issue/328-4297.html","code":"pop_fsczbz","sortId":7,"iconType":"right","imageUrl":"https://img11.360buyimg.com/cms/jfs/t17278/216/2238969327/1760/ff798431/5aec1dc9Nc81d6afe.png","jichu":false,"show":true,"tip":"商品签收30天内，商品质量问题可申请保险理赔。","text":"材质保障","jdPostAndService":false},{"helpLink":"http://help.jd.com/user/issue/list-114-470.html","code":"pop_quick_audit","sortId":7,"iconType":"right","imageUrl":"http://m.360buyimg.com/cc/jfs/t1/29220/10/5991/3445/5c4689f0Eecc5dd6a/27955a2c16c81e3d.png","jichu":false,"show":false,"tip":"极速审核是指当用户以7天无理由相关原因提交售后申请时，满足相关条件最快0秒审核通过的服务","text":"极速审核","jdPostAndService":false}]},"support":[],"isStock":true},"userInfoMap":{"samMember":false,"unJdUserFlag":false,"plusMember":"5","idAuthThrough":false,"jingXiangScore":0},"isPlusMember":"5","wozheFlag":false,"isJdkd":false,"actions":{"highPriceBuy":{"jumpType":1,"truthBigSale":false,"bizKey":"yjhx","icon":"http://m.360buyimg.com/cc/jfs/t1/17024/4/15356/2143/5caeb5efEf90f64a9/f4205d7302e4433c.png","descBounce":"免费上门取件清空衣柜","mustLogin":false,"url":"https://huishou.m.jd.com/index?s=1&source=3&skuId=10056328583143&cid1=1315&cid2=1342&cid3=1349&province=2&city=2825&town=0&hx=0&IsSXQJ=0&IsYZS=0&menu=0&commodityType=1&activityType=1","desc":"免费上门取件清空衣柜"}},"isJdwl":false,"promotion":{"gift":[],"canReturnHaggleInfo":false,"isTwoLine":false,"plusMark":"tab_var_124","activity":[],"upgradePurchaseMap":{},"customtag":{},"giftTips":"","screenLiPurMap":{},"tips":[],"normalMark":"tab_var_071","limitBuyInfo":{"limitNum":"0","noSaleFlag":"0","resultExt":{"noSaleFlag":"0","strategyFlag":"0","isPlusLimit":"0","limitUserFlag":"1","limitAreaFlag":"1","limitPeopleFlag":"1"}},"isBargain":false,"tip":"","attach":[],"prompt":""}}

三、使用 execjs 在Python中执行JS

直接上代码：

    import execjswith open('h5st_fp.js', 'r', encoding='utf-8') as f:jsCode = f.read()encrypted = execjs.compile(jsCode).call('ParamsSign')print("jd fp ： " + encrypted)

收工！

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