feat(huya): isNative定案NativeBridge纯Java + GUID值流还原(服务端sGuid签发) + unidbg金测试恢复
- dex直读判定: NativeBridge.b/a/c/g/h/klog全为Java(classes5), NativeEntry全native; .data描述符块=GetStaticMethodID反向调Java的name/sig常量表 - GUID值流完整还原: native getGUID=纯缓存getter(pref hydeviceid_guid -> WupHelper.getGuid() -> b(100) -> 回写) YYProtoSdkModule.initHuyaUdbSdk(classes17)->HyDeviceProxy.j(appid,WupHelper.getGuid(),mid)->pnc.a WupHelper.getGuid->HalImpl.getGuid->sGuidProperty<--live-launch服务端LiveLaunchRsp.sGuid(32hex硬校验) - 修正结论: GUID非本地指纹公式, 铸币=服务端doLaunch/device_register按虚拟设备指纹签发sGuid - unidbg: 新harness回归根因=C++ locale/facet在unidbg libc++上ABI崩溃; 旧harness+当前merged恢复金测试MATCH, 实证native缓存写回流 - 新工具: tools/dex_probe_native.py(dex access_flags判定), tools/dex_scan_calls.py(跨dex调用点扫描)
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#!/usr/bin/env python3
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"""dex 静态判定: 扫描 APK 全部 classes*.dex, 定位目标类及其方法的 access_flags。
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用途: 确定 NativeBridge.b / WupHelper.getGuid 等是否声明为 native (ACC_NATIVE=0x100),
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完全不碰设备。
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"""
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import struct
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import sys
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from pathlib import Path
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ACC_PUBLIC = 0x1
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ACC_PRIVATE = 0x2
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ACC_PROTECTED = 0x4
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ACC_STATIC = 0x8
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ACC_FINAL = 0x10
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ACC_SYNCHRONIZED = 0x20
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ACC_VOLATILE = 0x40
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ACC_NATIVE = 0x100
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ACC_ABSTRACT = 0x400
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ACC_CONSTRUCTOR = 0x10000
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ACC_DECLARED_SYNCHRONIZED = 0x20000
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ACC_NAMES = {
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ACC_PUBLIC: "public", ACC_PRIVATE: "private", ACC_PROTECTED: "protected",
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ACC_STATIC: "static", ACC_FINAL: "final", ACC_SYNCHRONIZED: "synchronized",
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ACC_VOLATILE: "volatile", ACC_NATIVE: "native", ACC_ABSTRACT: "abstract",
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ACC_CONSTRUCTOR: "constructor", ACC_DECLARED_SYNCHRONIZED: "declared-synchronized",
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}
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def read_uleb128(buf, off):
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result = 0
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shift = 0
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while True:
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b = buf[off]
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off += 1
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result |= (b & 0x7F) << shift
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if (b & 0x80) == 0:
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break
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shift += 7
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return result, off
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def read_sleb128(buf, off):
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result = 0
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shift = 0
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b = 0
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while True:
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b = buf[off]
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off += 1
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result |= (b & 0x7F) << shift
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shift += 7
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if (b & 0x80) == 0:
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break
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if b & 0x40:
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result |= -(1 << shift)
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return result, off
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class Dex:
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def __init__(self, data):
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self.data = data
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assert data[:8] == b"dex\n035\0" or data[:8] == b"dex\n037\0" or data[:8] == b"dex\n038\0" or data[:8] == b"dex\n039\0", data[:8]
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self.string_ids_size, self.string_ids_off = struct.unpack_from("<II", data, 0x38)
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self.type_ids_size, self.type_ids_off = struct.unpack_from("<II", data, 0x40)
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self.proto_ids_size, self.proto_ids_off = struct.unpack_from("<II", data, 0x48)
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self.field_ids_size, self.field_ids_off = struct.unpack_from("<II", data, 0x50)
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self.method_ids_size, self.method_ids_off = struct.unpack_from("<II", data, 0x58)
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self.class_defs_size, self.class_defs_off = struct.unpack_from("<II", data, 0x60)
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def string(self, idx):
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off = struct.unpack_from("<I", self.data, self.string_ids_off + idx * 4)[0]
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# skip uleb128 utf16 size
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_, off = read_uleb128(self.data, off)
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end = self.data.index(b"\0", off)
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return self.data[off:end].decode("utf-8", "replace")
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def type(self, idx):
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desc_idx = struct.unpack_from("<I", self.data, self.type_ids_off + idx * 4)[0]
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return self.string(desc_idx)
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def method(self, idx):
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class_idx, proto_idx, name_idx = struct.unpack_from("<HHI", self.data, self.method_ids_off + idx * 8)
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return self.type(class_idx), self.string(name_idx), proto_idx
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def proto(self, idx):
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shorty_idx, return_type_idx, params_off = struct.unpack_from("<III", self.data, self.proto_ids_off + idx * 12)
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rt = self.type(return_type_idx)
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params = []
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if params_off:
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size = struct.unpack_from("<I", self.data, params_off)[0]
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for i in range(size):
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params.append(self.type(struct.unpack_from("<H", self.data, params_off + 4 + i * 2)[0]))
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return rt, params
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def class_defs_iter(self):
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for i in range(self.class_defs_size):
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fields = struct.unpack_from("<IIIIIIII", self.data, self.class_defs_off + i * 32)
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class_idx, access_flags, superclass_idx, interfaces_off, source_file_idx, annotations_off, class_data_off, static_values_off = fields
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yield {
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"class_idx": class_idx,
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"access_flags": access_flags,
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"class_data_off": class_data_off,
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}
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def class_data_methods(self, cd_off):
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"""return list of (name_idx, access_flags, code_off)"""
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if cd_off == 0:
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return []
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off = cd_off
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static_fields, off = read_uleb128(self.data, off)
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instance_fields, off = read_uleb128(self.data, off)
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direct_methods, off = read_uleb128(self.data, off)
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virtual_methods, off = read_uleb128(self.data, off)
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# skip field entries (each = field_idx_diff + access_flags)
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fidx = 0
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for _ in range(static_fields + instance_fields):
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diff, off = read_uleb128(self.data, off)
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fidx += diff
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_, off = read_uleb128(self.data, off)
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res = []
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idx = 0
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for _ in range(direct_methods + virtual_methods):
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idx_diff, off = read_uleb128(self.data, off)
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idx += idx_diff
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acc, off = read_uleb128(self.data, off)
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code_off, off = read_uleb128(self.data, off)
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res.append((idx, acc, code_off))
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return res
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def flags_str(self, flags):
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parts = []
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for bit, name in ACC_NAMES.items():
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if flags & bit:
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parts.append(name)
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return " ".join(parts) if parts else ""
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def main():
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dex_dir = Path(sys.argv[1]) if len(sys.argv) > 1 else Path("work/apk_extract")
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# 目标: 类名 -> 关注的方法名集合
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targets = {
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"Lcom/huya/security/hydeviceid/NativeBridge;": {"b", "klog", "a", "c", "h", "g"},
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"Lcom/huya/security/hydeviceid/NativeEntry;": {"getGUID", "init", "getMID", "getHDID", "getCDID", "getSDID"},
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"Lcom/huya/security/hydeviceid/WupHelper;": {"getGuid", "getGuid1", "buildGuid"},
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"Lcom/huya/security/hydeviceid/HuyaAuthCore;": None, # 全部方法
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}
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found = {}
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for dex_path in sorted(dex_dir.glob("classes*.dex")):
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data = dex_path.read_bytes()
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dex = Dex(data)
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for cd in dex.class_defs_iter():
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try:
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cls = dex.type(cd["class_idx"])
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except struct.error:
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continue
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if cls not in targets:
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continue
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wanted = targets[cls]
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try:
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methods = dex.class_data_methods(cd["class_data_off"])
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except struct.error as e:
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print(f" [skip] {cls} in {dex_path.name}: class_data parse error {e}")
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continue
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entry = found.setdefault(cls, [])
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entry.append(str(dex_path.name))
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out = []
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for m_idx, acc, code_off in methods:
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if m_idx >= dex.method_ids_size:
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continue
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mcls, mname, proto_idx = dex.method(m_idx)
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if wanted is not None and mname not in wanted and not (wanted is None):
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continue
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rt, params = dex.proto(proto_idx)
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sig = f"({''.join(params)}){rt}"
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out.append(f" {dex.flags_str(acc):32s} {mname}{sig} code_off={code_off:#x}")
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if out:
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print(f"== {cls} <in {dex_path.name}> class_flags={dex.flags_str(cd['access_flags'])}")
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print("\n".join(out))
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if not found:
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# 打印包含这些类名串的 dex, 方便定位动态下载的 dex
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print("target classes NOT found in any classes*.dex; searching string blobs...")
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for cls in targets:
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blob = cls.encode()
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for dex_path in sorted(dex_dir.glob("classes*.dex")):
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data = dex_path.read_bytes()
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if blob in data:
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print(f" {cls} string present in {dex_path.name}")
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if __name__ == "__main__":
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main()
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