2b1fc0a4b9
When init fails due to macOS security policy (task_for_pid error), automatically re-sign WeChat with get-task-allow entitlement. Falls back to manual instructions if auto-signing fails.
195 lines
6.2 KiB
Python
195 lines
6.2 KiB
Python
"""macOS 密钥提取 — 通过 C 二进制扫描微信进程内存"""
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import os
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import platform
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import subprocess
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import sys
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import tempfile
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from .common import collect_db_files, cross_verify_keys, save_results, scan_memory_for_keys
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# Entitlements needed for task_for_pid to work on WeChat
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_ENTITLEMENTS_XML = """\
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>com.apple.security.get-task-allow</key>
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<true/>
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</dict>
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</plist>
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"""
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def _find_binary():
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"""查找对应架构的 C 二进制。"""
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machine = platform.machine()
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if machine == "arm64":
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name = "find_all_keys_macos.arm64"
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elif machine == "x86_64":
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name = "find_all_keys_macos.x86_64"
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else:
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raise RuntimeError(f"不支持的 macOS 架构: {machine}")
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# PyInstaller 运行时：从临时解压目录查找
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if getattr(sys, 'frozen', False):
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base = sys._MEIPASS
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else:
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base = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
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bin_path = os.path.join(base, "wechat_cli", "bin", name)
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if os.path.isfile(bin_path):
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return bin_path
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# fallback: 直接在 bin/ 下
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bin_path = os.path.join(base, "bin", name)
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if os.path.isfile(bin_path):
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return bin_path
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raise RuntimeError(
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f"找不到密钥提取二进制: {bin_path}\n"
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"请确认安装包完整"
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)
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def _resign_wechat():
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"""Re-sign WeChat with get-task-allow entitlement so task_for_pid works."""
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wechat_paths = [
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"/Applications/WeChat.app",
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os.path.expanduser("~/Applications/WeChat.app"),
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]
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wechat_app = None
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for p in wechat_paths:
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if os.path.isdir(p):
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wechat_app = p
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break
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if wechat_app is None:
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return False, "未找到 WeChat.app（已搜索 /Applications 和 ~/Applications）"
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# Write entitlements to temp file
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ent_fd, ent_path = tempfile.mkstemp(suffix=".xml")
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try:
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with os.fdopen(ent_fd, "w") as f:
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f.write(_ENTITLEMENTS_XML)
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print(f"\n[*] 检测到 task_for_pid 权限不足，正在对微信重新签名...")
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print(f" 目标: {wechat_app}")
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result = subprocess.run(
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["codesign", "--force", "--sign", "-", "--entitlements", ent_path, wechat_app],
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capture_output=True,
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text=True,
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timeout=60,
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)
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finally:
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os.unlink(ent_path)
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if result.returncode != 0:
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return False, f"codesign 失败: {result.stderr.strip()}"
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print("[+] 签名完成！请重新启动微信后再执行 init。")
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return True, None
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def extract_keys(db_dir, output_path, pid=None):
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"""通过 C 二进制提取 macOS 微信数据库密钥。
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C 二进制需要在微信数据目录的父目录下运行，
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因为它会自动检测 db_storage 子目录。
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输出 all_keys.json 到当前工作目录。
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Args:
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db_dir: 微信 db_storage 目录
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output_path: all_keys.json 输出路径
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pid: 未使用（C 二进制自动检测进程）
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Returns:
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dict: salt_hex -> enc_key_hex 映射
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"""
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import json
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binary = _find_binary()
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# C 二进制的工作目录需要是 db_storage 的父目录
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work_dir = os.path.dirname(db_dir)
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if not os.path.isdir(work_dir):
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raise RuntimeError(f"微信数据目录不存在: {work_dir}")
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print(f"[+] 使用 C 二进制提取密钥: {binary}")
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print(f"[+] 工作目录: {work_dir}")
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try:
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result = subprocess.run(
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[binary],
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cwd=work_dir,
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capture_output=True,
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text=True,
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timeout=120,
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)
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except subprocess.TimeoutExpired:
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raise RuntimeError("密钥提取超时（120s）")
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except PermissionError:
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raise RuntimeError(
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f"无法执行 {binary}\n"
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"请确保文件有执行权限: chmod +x " + binary
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)
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# 打印 C 二进制的输出
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if result.stdout:
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print(result.stdout)
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if result.stderr:
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print(result.stderr, file=sys.stderr)
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# 检测 task_for_pid 失败 → 尝试 re-sign
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combined_output = (result.stdout or "") + (result.stderr or "")
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if "task_for_pid" in combined_output:
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print("\n[!] task_for_pid 失败：macOS 安全策略阻止了进程内存访问。")
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print("[!] 需要对微信重新签名以允许调试访问。")
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ok, err = _resign_wechat()
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if ok:
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raise RuntimeError(
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"已对微信重新签名。请执行以下步骤后重试：\n"
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" 1. 退出微信（完全退出，不是最小化）\n"
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" 2. 重新打开微信并登录\n"
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" 3. 再次执行: sudo wechat-cli init"
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)
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else:
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raise RuntimeError(
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f"自动签名失败: {err}\n"
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"请手动执行以下命令后重试：\n"
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' codesign --force --sign - --entitlements /dev/stdin /Applications/WeChat.app <<\'EOF\'\n'
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+ _ENTITLEMENTS_XML +
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"EOF\n"
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"然后重启微信，再执行: sudo wechat-cli init"
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)
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# C 二进制输出 all_keys.json 到 work_dir
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c_output = os.path.join(work_dir, "all_keys.json")
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if not os.path.exists(c_output):
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raise RuntimeError(
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"C 二进制未能生成密钥文件。\n"
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f"stdout: {result.stdout}\nstderr: {result.stderr}"
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)
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# 读取并转存到 output_path
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with open(c_output, encoding="utf-8") as f:
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keys_data = json.load(f)
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with open(output_path, 'w', encoding='utf-8') as f:
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json.dump(keys_data, f, indent=2, ensure_ascii=False)
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# 清理 C 二进制的临时输出
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if os.path.abspath(c_output) != os.path.abspath(output_path):
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os.remove(c_output)
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# 构建 salt -> key 映射
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key_map = {}
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for rel, info in keys_data.items():
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if isinstance(info, dict) and "enc_key" in info and "salt" in info:
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key_map[info["salt"]] = info["enc_key"]
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print(f"\n[+] 提取到 {len(key_map)} 个密钥，保存到: {output_path}")
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return key_map
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