feat(huya): 证书算法完全闭环 - 差分法证明标准AES-128-ECB并复现铸证
- NativeFunction直调差分: FIPS-197 KAT逐位一致, UdbAESUtil无魔改 - 证书 = b64([0x0C][key_idx][AES128-ECB(key16, zeropad(P1_187B))]) - P1结构: [010400][5008][u16+20B随机][u16+40B指纹hex][u16+114B hyCred] - 密钥: rodata默认三条(AESkeyMgr id=3/4/5) + 服务端下发会话钥(key_idx区分) - tools/cert_forge.py 重铸证书与活体密文 FULL MATCH
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yml2213
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#!/usr/bin/env python3
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"""抓取证书加密真实密钥: hook UdbAESUtil::C1(构造器,收16B key) + encrypt 出入口。
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背景: 差分已证明 Cipher=标准AES-128-ECB(tools/udb_aes.py selftest)，
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剩下唯一未知 = 生产者每次加密用的 key 字节。C1 是所有路径的必经点。
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时序(不可变): force-stop -> spawn挂起 -> 双bypass -> resume -> 10s -> patch_guard -> hooks
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触发: Java桥直呼 LoginProxy.getQUrlData(uid,"","") 复现证书生成。
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"""
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from __future__ import annotations
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import json
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import subprocess
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import time
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from pathlib import Path
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import frida
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RE = Path("/Users/yml/codes/Reverse-Engineering-Agent-Universal-v3.0")
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UID = 1199666914671
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JS = r"""
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'use strict';
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Process.setExceptionHandler(function(d){
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send({type:'segv', info:{type:d.type, addr:String(d.address)}});
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return true;
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});
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var base = Process.getModuleByName('libudbauthunify.so').base;
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send({type:'armed', base:String(base)});
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function rdStr(p){ // libc++ string 安全读取, 返回 {t,len,v(hex)}
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try{
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var b0=p.readU8();
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if((b0&1)===0){ var l=b0>>1; if(l>4096) return {t:'s?',len:l,v:''};
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return {t:'s',len:l,v:l?Array.from(new Uint8Array(p.add(1).readByteArray(l))).map(x=>('0'+x.toString(16)).slice(-2)).join(''):''}; }
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var len=parseInt(p.add(8).readU64().toString());
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if(len>65536) return {t:'l?',len:len,v:''};
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var dp=p.add(16).readPointer();
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return {t:'l',len:len,v:Array.from(new Uint8Array(dp.readByteArray(len))).map(x=>('0'+x.toString(16)).slice(-2)).join('')};
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}catch(e){ return {t:'err',len:-1,v:String(e)}; }
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}
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function hx(p,n){ try{ return Array.from(new Uint8Array(p.readByteArray(n))).map(x=>('0'+x.toString(16)).slice(-2)).join(''); }catch(e){ return 'ERR'; } }
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// 1) 构造器: 每次AES对象创建的16字节真钥
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Interceptor.attach(base.add(0x24eb08), {
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onEnter: function(a){ send({type:'c1', key:hx(a[1],16), bt:DebugSymbol.fromAddress(this.returnAddress).toString().slice(0,80)}); }
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});
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// 2) 公开 encrypt(ret,x1,x2,...): 全参原始dump, 不再猜测约定
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Interceptor.attach(base.add(0x250038), {
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onEnter: function(a){
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this.ra = DebugSymbol.fromAddress(this.returnAddress).toString().slice(0,90);
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this.retbuf = a[0]; // sret 缓冲指针(onLeave时 x0 可能已变, 用入口快照)
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send({type:'enc_in', ra:this.ra,
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x0s:rdStr(a[0]), x1s:rdStr(a[1]), x2s:rdStr(a[2]), x3s:rdStr(a[3]),
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x1raw:hx(a[1],32), x2raw:hx(a[2],32), x3raw:hx(a[3],32)});
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},
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onLeave: function(r){ send({type:'enc_out', ret:rdStr(this.retbuf)}); }
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});
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// 2.5) encode_aes(in,key,out): 看选key逻辑
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Interceptor.attach(base.add(0x330218), {
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onEnter: function(a){
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this.p0=rdStr(a[0]); this.p1=rdStr(a[1]);
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this.ra = DebugSymbol.fromAddress(this.returnAddress).toString().slice(0,90);
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},
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onLeave: function(){ send({type:'encode_aes', ra:this.ra, p0:this.p0, p1:this.p1}); }
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});
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// 3) _encrypt(block,out&) 入口: 确认其调用方与块内容
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Interceptor.attach(base.add(0x24f9f0), {
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onEnter: function(a){
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send({type:'_enc', ra:DebugSymbol.fromAddress(this.returnAddress).toString().slice(0,90),
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blk:hx(a[1],16)});
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}
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});
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// 自动触发证书生成
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Java.perform(function(){
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var n=0;
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function go(){
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try{
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var seed=Java.use('com.duowan.kiwi.base.login.udb.HuyaLoginProxy');
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var F=Java.ClassFactory.get(seed.class.getClassLoader());
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var inst=F.use('com.hysdkproxy.LoginProxy').getInstance();
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var q=inst.getQUrlData(__UID__, "", "");
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send({type:'qurl_done', len:q?q.length:0, data:q||''});
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}catch(e){ n+=1; if(n%6===0) send({type:'retry',n:n}); setTimeout(go,5000); }
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}
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setTimeout(go, 20000);
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});
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""".replace('__UID__', str(UID))
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def main():
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d = frida.get_device_manager().add_remote_device('127.0.0.1:31877')
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pid = d.spawn(['com.duowan.kiwi'])
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print(f'spawned {pid}')
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s = d.attach(pid)
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s.create_script((RE / "evidence/scripts/bypass_msaoaid_maps_art_callsite.js").read_text()).load()
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s.create_script((RE / "evidence/scripts/mask_frida_maps_only.js").read_text()).load()
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d.resume(pid)
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print('resumed')
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time.sleep(11)
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s.create_script((RE / "evidence/scripts/patch_guard_block_termination.js").read_text()).load()
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print('patch_guard on')
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sc = s.create_script(JS)
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events = []
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got_armed = []
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def on_msg(m, _):
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if m.get('type') == 'error':
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print('JS ERR:', str(m)[:240]); return
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if m.get('type') != 'send':
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return
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p = m.get('payload') or {}
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t = p.get('type')
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if t != 'retry':
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events.append(p)
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if t == 'armed':
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got_armed.append(1); print('[armed]', p['base'])
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elif t == 'c1':
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print(f"[C1] key={p['key']} <- {p['bt'][:60]}")
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elif t == 'enc_in':
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print(f"[enc] ra={p['ra'][:60]}")
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print(f" x1s={p['x1s']['t']}:{p['x1s']['len']} head={p['x1s']['v'][:48]}")
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print(f" x2s={p['x2s']['t']}:{p['x2s']['len']} head={p['x2s']['v'][:48]}")
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print(f" x3s={p['x3s']['t']}:{p['x3s']['len']} head={p['x3s']['v'][:48]}")
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elif t == 'enc_out':
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print(f" out={p['ret']['t']}:{p['ret']['len']} head={p['ret']['v'][:48]}")
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elif t == '_enc':
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print(f"[_encrypt] blk={p['blk']} <- {p['ra'][:60]}")
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elif t == 'encode_aes':
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print(f"[encode_aes] p0={p['p0']['t']}:{p['p0']['len']},{p['p0']['v'][:48]} "
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f"p1={p['p1']['t']}:{p['p1']['len']},{p['p1']['v'][:48]} <- {p['ra'][:56]}")
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elif t == 'qurl_done':
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print('[qurl_done]', p.get('len'), 'head:', (p.get('data') or '')[:60])
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sc.on('message', on_msg)
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sc.load()
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assert got_armed
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deadline = time.time() + 150
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while time.time() < deadline:
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time.sleep(2)
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if any(e.get('type') == 'qurl_done' for e in events):
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time.sleep(8)
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break
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Path('/Users/yml/codes/douyu_login_py/evidence/cert_keycap.json').write_text(
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json.dumps(events))
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from collections import Counter
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print('saved:', Counter(e.get('type') for e in events))
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if __name__ == '__main__':
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for attempt in range(4):
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print(f'===== 尝试 #{attempt+1} =====')
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try:
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main()
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break
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except frida.InvalidOperationError as e:
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print(f'session detached: {e}')
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subprocess.run(['adb', 'shell', 'am', 'force-stop', 'com.duowan.kiwi'])
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time.sleep(3)
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except Exception as e:
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print(f'err: {e}')
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time.sleep(3)
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