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www.hackthebox.eu

获取邀请码

打开控制台

根据提示获得信息，当前页面存在一个有趣的js文件，找到它获取下一步信息

查看网站的js文件内容

发现inviteapi.min.js，从名字可了解到该js为邀请接口相关的，获取内容为

//This javascript code looks strange...is it obfuscated???

eval(function(p,a,c,k,e,r){e=function(c){return c.toString(a)};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('0 3(){$.4({5:"6",7:"8",9:\'/b/c/d/e/f\',g:0(a){1.2(a)},h:0(a){1.2(a)}})}',18,18,'function|console|log|makeInviteCode|ajax|type|POST|dataType|json|url||api|invite|how|to|generate|success|error'.split('|'),0,{}))

解读js内容，获取信息如下

• 这个js代码看起来比较特殊
• eval，即执行这些代码
• 拆解上面的代码，获取方法体，及参数
• 方法体

function(p,a,c,k,e,r){e=function(c){return c.toString(a)};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}

• 参数

('0 3(){$.4({5:"6",7:"8",9:\'/b/c/d/e/f\',g:0(a){1.2(a)},h:0(a){1.2(a)}})}',18,18,'function|console|log|makeInviteCode|ajax|type|POST|dataType|json|url||api|invite|how|to|generate|success|error'.split('|'),0,{})

在控制台执行js

• 声明function

function test(p,a,c,k,e,r){e=function(c){return c.toString(a)};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}

• 执行function

test('0 3(){$.4({5:"6",7:"8",9:\'/b/c/d/e/f\',g:0(a){1.2(a)},h:0(a){1.2(a)}})}',18,18,'function|console|log|makeInviteCode|ajax|type|POST|dataType|json|url||api|invite|how|to|generate|success|error'.split('|'),0,{})

调用api获取如何生成邀请码

$ curl -X POST https://www.hackthebox.eu//api/invite/how/to/generate
{"success":1,"data":{"data":"SW4gb3JkZXIgdG8gZ2VuZXJhdGUgdGhlIGludml0ZSBjb2RlLCBtYWtlIGEgUE9TVCByZXF1ZXN0IHRvIC9hcGkvaW52aXRlL2dlbmVyYXRl","enctype":"BASE64"},"hint":"Data is encrypted \u2026 We should probably check the encryption type in order to decrypt it\u2026","0":200}

• 将上述data通过base64解密，获取以下信息

In order to generate the invite code, make a POST request to /api/invite/generate

获取邀请码

$ curl -X POST https://www.hackthebox.eu/api/invite/generate
{"success":1,"data":{"code":"R0pFQUUtRlFMU1ctTENUQVAtUEpMT1otUVdCU1U=","format":"encoded"},"0":200}

• 将上述code通过base64解密，获得邀请码

GJEAE-FQLSW-LCTAP-PJLOZ-QWBSU