533 lines
19 KiB
Python
533 lines
19 KiB
Python
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"""Linux 微信进程内存密钥提取器。
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参考 wechat-cli-main 实现：
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- 通过 /proc/<pid>/maps 枚举微信进程可读内存段
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- 通过 /proc/<pid>/mem 读取内存
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- 匹配 x'<hex>' 模式（64 位 enc_key、96 位 enc_key+salt、更长 hex）
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- 用 HMAC-SHA512 校验确认 enc_key
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- 返回 salt_hex -> enc_key_hex 映射
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"""
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from __future__ import annotations
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import hashlib
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import hmac as hmac_mod
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import logging
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import os
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import re
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import struct
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_logger = logging.getLogger(__name__)
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PAGE_SZ = 4096
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KEY_SZ = 32
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SALT_SZ = 16
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IV_SIZE = 16
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HMAC_SIZE = 64
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RESERVE_SIZE = 80
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MAC_SALT_XOR = 0x3A
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# 单次内存读取上限（避免超大映射导致内存爆炸）
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_MAX_REGION_SIZE = 500 * 1024 * 1024
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_KNOWN_COMMS = {"wechat", "wechatappex", "weixin"}
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# crashpad / 渲染辅助子进程：内存中不含主进程的 DB 密钥，扫描会浪费时间
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_EXCLUDE_COMM_KEYWORDS = ("crashpad", "crashpad_handler", "renderer", "gpu-process")
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_INTERPRETER_PREFIXES = ("python", "bash", "sh", "zsh", "node", "perl", "ruby")
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_SKIP_MAPPINGS = {"[vdso]", "[vsyscall]", "[vvar]"}
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_SKIP_PATH_PREFIXES = ("/usr/lib/", "/lib/", "/usr/share/")
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def _safe_readlink(path: str) -> str:
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try:
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return os.path.realpath(os.readlink(path))
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except OSError:
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return ""
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def _is_wechat_process(pid: int) -> bool:
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"""检查 pid 是否为微信主进程（排除 crashpad 等辅助子进程）。
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排除逻辑：
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- crashpad_handler / crashpad 子进程：内存中无 DB 密钥，扫描浪费时间
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- 渲染/GPU 辅助进程：同上
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- 解释器进程（python/bash 等）：避免误中
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"""
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if pid == os.getpid():
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return False
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try:
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with open(f"/proc/{pid}/comm", encoding="utf-8", errors="replace") as f:
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comm = f.read().strip()
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comm_lower = comm.lower()
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# 排除 crashpad 等辅助子进程
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if any(kw in comm_lower for kw in _EXCLUDE_COMM_KEYWORDS):
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return False
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if comm_lower in _KNOWN_COMMS:
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return True
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exe_path = _safe_readlink(f"/proc/{pid}/exe")
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exe_name = os.path.basename(exe_path)
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if any(exe_name.lower().startswith(p) for p in _INTERPRETER_PREFIXES):
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return False
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return "wechat" in exe_name.lower() or "weixin" in exe_name.lower()
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except (PermissionError, FileNotFoundError, ProcessLookupError):
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return False
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def _get_wechat_pids() -> list[tuple[int, int]]:
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"""返回疑似微信进程的 (pid, rss_kb) 列表，按内存占用降序。"""
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pids: list[tuple[int, int]] = []
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for pid_str in os.listdir("/proc"):
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if not pid_str.isdigit():
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continue
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pid = int(pid_str)
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try:
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if not _is_wechat_process(pid):
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continue
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with open(f"/proc/{pid}/statm", encoding="utf-8") as f:
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rss_pages = int(f.read().split()[1])
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rss_kb = rss_pages * 4
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pids.append((pid, rss_kb))
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except (PermissionError, FileNotFoundError, ProcessLookupError, OSError, ValueError):
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continue
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pids.sort(key=lambda x: x[1], reverse=True)
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return pids
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def _get_readable_regions(pid: int, full_scan: bool = False) -> list[tuple[int, int, str]]:
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"""解析 /proc/<pid>/maps，返回可读内存区域 (base, size, name) 列表。
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Args:
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pid: 目标进程 PID
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full_scan: 为 True 时不跳过系统库路径（更慢但更全）；默认按已知路径过滤
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"""
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regions: list[tuple[int, int, str]] = []
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maps_path = f"/proc/{pid}/maps"
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with open(maps_path, "r", encoding="utf-8", errors="replace") as f:
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for line in f:
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parts = line.split()
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if len(parts) < 2:
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continue
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perms = parts[1]
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if "r" not in perms:
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continue
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mapping_name = parts[5] if len(parts) >= 6 else ""
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if mapping_name in _SKIP_MAPPINGS:
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continue
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if not full_scan:
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mapping_lower = mapping_name.lower()
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if (
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any(mapping_name.startswith(p) for p in _SKIP_PATH_PREFIXES)
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and "wcdb" not in mapping_lower
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and "wechat" not in mapping_lower
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and "weixin" not in mapping_lower
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):
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continue
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start_s, end_s = parts[0].split("-")
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start = int(start_s, 16)
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size = int(end_s, 16) - start
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if 0 < size < _MAX_REGION_SIZE:
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regions.append((start, size, mapping_name))
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return regions
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def _collect_db_files(db_dir: str) -> tuple[list[tuple[str, str, int, str, bytes]], dict[str, list[str]]]:
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"""遍历 db_dir 收集所有 .db 文件及其 salt。
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Returns:
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db_files: [(rel_path, abs_path, size, salt_hex, page1_bytes), ...]
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salt_to_dbs: {salt_hex: [rel_path, ...]}
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"""
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db_files: list[tuple[str, str, int, str, bytes]] = []
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salt_to_dbs: dict[str, list[str]] = {}
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if not os.path.isdir(db_dir):
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return db_files, salt_to_dbs
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for root, _, files in os.walk(db_dir):
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for name in files:
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if not name.endswith(".db") or name.endswith("-wal") or name.endswith("-shm"):
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continue
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path = os.path.join(root, name)
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try:
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size = os.path.getsize(path)
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except OSError:
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continue
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if size < PAGE_SZ:
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continue
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try:
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with open(path, "rb") as f:
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page1 = f.read(PAGE_SZ)
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except OSError:
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continue
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if page1.startswith(b"SQLite format 3\x00"):
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continue
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rel = os.path.relpath(path, db_dir)
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salt = page1[:SALT_SZ].hex()
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db_files.append((rel, path, size, salt, page1))
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salt_to_dbs.setdefault(salt, []).append(rel)
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return db_files, salt_to_dbs
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def _verify_enc_key(enc_key: bytes, page1: bytes) -> bool:
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"""通过 HMAC-SHA512 校验 page 1 验证 enc_key 是否正确。"""
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salt = page1[:SALT_SZ]
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mac_salt = bytes(b ^ MAC_SALT_XOR for b in salt)
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mac_key = hashlib.pbkdf2_hmac("sha512", enc_key, mac_salt, 2, dklen=KEY_SZ)
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hmac_data = page1[SALT_SZ: PAGE_SZ - RESERVE_SIZE + IV_SIZE]
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stored_hmac = page1[PAGE_SZ - HMAC_SIZE: PAGE_SZ]
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hm = hmac_mod.new(mac_key, hmac_data, hashlib.sha512)
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hm.update(struct.pack("<I", 1))
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return hm.digest() == stored_hmac
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class KeyExtractor:
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"""Linux 微信进程内存密钥提取器。"""
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def __init__(self, wechat_pid: int, probe_db_path: str):
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"""
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Args:
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wechat_pid: 微信进程 PID（为 0 时自动检测）
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probe_db_path: 用于验证 key 的加密 DB 文件路径，或包含 DB 的目录
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"""
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self.wechat_pid = wechat_pid
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self.probe_db_path = probe_db_path
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self._hex_re = re.compile(rb"x'([0-9a-fA-F]{64,192})'")
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# ------------------------------------------------------------------
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# 旧接口兼容：返回 probe DB 对应 salt 的 enc_key
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# ------------------------------------------------------------------
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def extract_key(self) -> str | None:
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"""扫描内存提取与 probe_db_path 匹配的 SQLCipher 密钥。
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Returns:
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64 位十六进制 enc_key 字符串，未找到返回 None
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"""
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db_dir = self.probe_db_path
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if os.path.isfile(db_dir):
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db_dir = os.path.dirname(db_dir)
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key_map = self.extract_all_keys(db_dir)
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# 优先匹配 probe_db_path 自己的 salt
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probe_salt = None
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if os.path.isfile(self.probe_db_path):
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try:
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with open(self.probe_db_path, "rb") as f:
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page1 = f.read(PAGE_SZ)
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if not page1.startswith(b"SQLite format 3\x00"):
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probe_salt = page1[:SALT_SZ].hex()
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except OSError:
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pass
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if probe_salt and probe_salt in key_map:
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return key_map[probe_salt]
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# 否则返回任意一个找到的 key
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if key_map:
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return next(iter(key_map.values()))
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return None
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# ------------------------------------------------------------------
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# 新接口：返回 salt_hex -> enc_key_hex 映射
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# ------------------------------------------------------------------
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def extract_all_keys(
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self,
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db_dir: str | None = None,
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full_scan: bool = False,
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) -> dict[str, str]:
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"""扫描内存，为 db_dir 下每个加密 DB salt 提取 enc_key。
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Args:
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db_dir: 微信数据库目录。默认为 probe_db_path 所在目录。
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full_scan: 是否完整扫描所有可读内存区域（默认优先扫描 [heap]，未找全再扫其它）。
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Returns:
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dict: {salt_hex: enc_key_hex}
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"""
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if db_dir is None:
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db_dir = self.probe_db_path
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if os.path.isfile(db_dir):
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db_dir = os.path.dirname(db_dir)
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db_files, salt_to_dbs = _collect_db_files(db_dir)
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if not db_files:
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_logger.warning("在 %s 下未找到加密 DB 文件", db_dir)
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return {}
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_logger.info(
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"找到 %d 个加密 DB，%d 个不同 salt",
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len(db_files),
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len(salt_to_dbs),
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)
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if self.wechat_pid:
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pids = [(self.wechat_pid, 0)]
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else:
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pids = _get_wechat_pids()
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if not pids:
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_logger.warning("未检测到微信进程")
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return {}
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_logger.info(
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"检测到 %d 个微信进程候选: %s",
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len(pids),
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[p for p, _ in pids],
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)
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key_map: dict[str, str] = {}
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remaining = set(salt_to_dbs.keys())
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for pid, _rss_kb in pids:
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if not remaining:
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break
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try:
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regions = _get_readable_regions(pid, full_scan=full_scan)
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except (PermissionError, FileNotFoundError, ProcessLookupError) as e:
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_logger.warning("无法读取 /proc/%s/maps: %s", pid, e)
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continue
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if not full_scan:
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# heap 优先，其次是 stack，再按区域大小降序
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def _heap_first_key(item: tuple[int, int, str]) -> tuple[int, int, str]:
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name = item[2].lower()
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if name == "[heap]":
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return (0, 0, name)
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if name == "[stack]":
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return (1, 0, name)
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return (2, -item[1], name)
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regions.sort(key=_heap_first_key)
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total_size = sum(size for _, size, _ in regions)
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total_mib = total_size / (1024 * 1024)
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_logger.info(
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"PID %s 开始扫描 %d 个区域，合计 %.1f MiB（full_scan=%s）",
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pid,
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len(regions),
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total_mib,
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full_scan,
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)
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try:
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mem = open(f"/proc/{pid}/mem", "rb")
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except (PermissionError, FileNotFoundError, ProcessLookupError) as e:
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_logger.warning("无法打开 /proc/%s/mem: %s", pid, e)
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continue
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try:
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for idx, (base, size, name) in enumerate(regions):
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if not remaining:
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break
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_logger.info(
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"区域 %d/%d PID=%s [%-16s] 0x%016x size=%.1fMiB 剩余salt=%d",
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idx + 1,
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len(regions),
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pid,
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name or "?",
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|
|
base,
|
|||
|
|
size / (1024 * 1024),
|
|||
|
|
len(remaining),
|
|||
|
|
)
|
|||
|
|
try:
|
|||
|
|
self._scan_region(
|
|||
|
|
mem, base, size, name,
|
|||
|
|
db_files, key_map, remaining, pid,
|
|||
|
|
)
|
|||
|
|
except (OSError, ValueError) as e:
|
|||
|
|
_logger.debug("读取区域失败 PID=%s addr=0x%016x: %s", pid, base, e)
|
|||
|
|
continue
|
|||
|
|
_logger.info(
|
|||
|
|
"完成区域 %d/%d，已找到 %d/%d 个 enc_key",
|
|||
|
|
idx + 1,
|
|||
|
|
len(regions),
|
|||
|
|
len(key_map),
|
|||
|
|
len(salt_to_dbs),
|
|||
|
|
)
|
|||
|
|
finally:
|
|||
|
|
mem.close()
|
|||
|
|
|
|||
|
|
# 交叉验证：用已找到的 key 验证未匹配的 salt（多 DB 可能共用 enc_key）
|
|||
|
|
self._cross_verify(db_files, key_map, remaining)
|
|||
|
|
|
|||
|
|
if key_map:
|
|||
|
|
_logger.info(
|
|||
|
|
"成功提取 %d/%d 个 salt 的 enc_key",
|
|||
|
|
len(key_map),
|
|||
|
|
len(salt_to_dbs),
|
|||
|
|
)
|
|||
|
|
else:
|
|||
|
|
_logger.warning("扫描完成，未找到任何有效 enc_key")
|
|||
|
|
return key_map
|
|||
|
|
|
|||
|
|
def _scan_buffer(
|
|||
|
|
self,
|
|||
|
|
data: bytes,
|
|||
|
|
db_files: list[tuple[str, str, int, str, bytes]],
|
|||
|
|
key_map: dict[str, str],
|
|||
|
|
remaining: set[str],
|
|||
|
|
base_addr: int,
|
|||
|
|
pid: int,
|
|||
|
|
) -> None:
|
|||
|
|
"""扫描一段内存数据，匹配 x'hex' 模式并验证。
|
|||
|
|
|
|||
|
|
hex 长度分支覆盖：
|
|||
|
|
- 64：纯 enc_key，尝试匹配所有剩余 salt
|
|||
|
|
- 96：enc_key(64) + salt(32)，按指定 salt 验证
|
|||
|
|
- >96 且偶数：取前 64 为 enc_key，末 32 为 salt
|
|||
|
|
- 66~94 偶数：无明确 salt，按纯 enc_key 尝试所有 salt（覆盖 64~192 全范围）
|
|||
|
|
"""
|
|||
|
|
for m in self._hex_re.finditer(data):
|
|||
|
|
hex_str = m.group(1).decode()
|
|||
|
|
addr = base_addr + m.start()
|
|||
|
|
hex_len = len(hex_str)
|
|||
|
|
|
|||
|
|
if hex_len == 64:
|
|||
|
|
enc_key_hex = hex_str
|
|||
|
|
self._try_key_all_salts(enc_key_hex, db_files, key_map, remaining, addr, pid)
|
|||
|
|
elif hex_len == 96:
|
|||
|
|
enc_key_hex = hex_str[:64]
|
|||
|
|
salt_hex = hex_str[64:]
|
|||
|
|
self._try_key(enc_key_hex, salt_hex, db_files, key_map, remaining, addr, pid)
|
|||
|
|
elif hex_len > 96 and hex_len % 2 == 0:
|
|||
|
|
enc_key_hex = hex_str[:64]
|
|||
|
|
salt_hex = hex_str[-32:]
|
|||
|
|
self._try_key(enc_key_hex, salt_hex, db_files, key_map, remaining, addr, pid)
|
|||
|
|
elif hex_len > 64 and hex_len < 96 and hex_len % 2 == 0:
|
|||
|
|
# 66~94 长度：无明确 salt 区，按纯 enc_key 尝试所有 salt
|
|||
|
|
enc_key_hex = hex_str[:64]
|
|||
|
|
self._try_key_all_salts(enc_key_hex, db_files, key_map, remaining, addr, pid)
|
|||
|
|
|
|||
|
|
def _scan_region(
|
|||
|
|
self,
|
|||
|
|
mem,
|
|||
|
|
base: int,
|
|||
|
|
size: int,
|
|||
|
|
name: str,
|
|||
|
|
db_files: list[tuple[str, str, int, str, bytes]],
|
|||
|
|
key_map: dict[str, str],
|
|||
|
|
remaining: set[str],
|
|||
|
|
pid: int,
|
|||
|
|
) -> None:
|
|||
|
|
"""流式读取并扫描一个内存区域，按 MiB 输出进度。
|
|||
|
|
|
|||
|
|
采用 8 MiB 分块 + 256 字节重叠，避免超大区域一次性读入内存，同时保证
|
|||
|
|
x'hex' 模式跨块边界时也能被匹配。
|
|||
|
|
"""
|
|||
|
|
chunk_size = 8 * 1024 * 1024
|
|||
|
|
overlap = 256
|
|||
|
|
tail = b""
|
|||
|
|
position = 0
|
|||
|
|
last_log_mib = -1
|
|||
|
|
region_mib = size / (1024 * 1024)
|
|||
|
|
|
|||
|
|
while position < size:
|
|||
|
|
to_read = min(chunk_size, size - position)
|
|||
|
|
try:
|
|||
|
|
mem.seek(base + position)
|
|||
|
|
chunk = mem.read(to_read)
|
|||
|
|
except (OSError, ValueError):
|
|||
|
|
break
|
|||
|
|
if not chunk:
|
|||
|
|
break
|
|||
|
|
|
|||
|
|
data = tail + chunk
|
|||
|
|
buffer_base = base + position - len(tail)
|
|||
|
|
self._scan_buffer(data, db_files, key_map, remaining, buffer_base, pid)
|
|||
|
|
|
|||
|
|
position += len(chunk)
|
|||
|
|
scanned_mib = position / (1024 * 1024)
|
|||
|
|
current_mib = int(scanned_mib)
|
|||
|
|
if current_mib > last_log_mib:
|
|||
|
|
last_log_mib = current_mib
|
|||
|
|
_logger.info(
|
|||
|
|
"PID %s [%-16s] 已扫描 %.1f/%.1f MiB，已找到 %d 个 enc_key",
|
|||
|
|
pid,
|
|||
|
|
name or "?",
|
|||
|
|
scanned_mib,
|
|||
|
|
region_mib,
|
|||
|
|
len(key_map),
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
tail = data[-overlap:] if len(data) >= overlap else data
|
|||
|
|
|
|||
|
|
def _try_key(
|
|||
|
|
self,
|
|||
|
|
enc_key_hex: str,
|
|||
|
|
salt_hex: str,
|
|||
|
|
db_files: list[tuple[str, str, int, str, bytes]],
|
|||
|
|
key_map: dict[str, str],
|
|||
|
|
remaining: set[str],
|
|||
|
|
addr: int,
|
|||
|
|
pid: int,
|
|||
|
|
) -> None:
|
|||
|
|
"""尝试用一个 enc_key 匹配指定 salt。"""
|
|||
|
|
if salt_hex not in remaining:
|
|||
|
|
return
|
|||
|
|
try:
|
|||
|
|
enc_key = bytes.fromhex(enc_key_hex)
|
|||
|
|
except ValueError:
|
|||
|
|
return
|
|||
|
|
for _rel, _path, _sz, s, page1 in db_files:
|
|||
|
|
if s != salt_hex:
|
|||
|
|
continue
|
|||
|
|
if _verify_enc_key(enc_key, page1):
|
|||
|
|
key_map[salt_hex] = enc_key_hex
|
|||
|
|
remaining.discard(salt_hex)
|
|||
|
|
_logger.info(
|
|||
|
|
"找到 enc_key: salt=%s PID=%s addr=0x%016x",
|
|||
|
|
salt_hex,
|
|||
|
|
pid,
|
|||
|
|
addr,
|
|||
|
|
)
|
|||
|
|
break
|
|||
|
|
|
|||
|
|
def _try_key_all_salts(
|
|||
|
|
self,
|
|||
|
|
enc_key_hex: str,
|
|||
|
|
db_files: list[tuple[str, str, int, str, bytes]],
|
|||
|
|
key_map: dict[str, str],
|
|||
|
|
remaining: set[str],
|
|||
|
|
addr: int,
|
|||
|
|
pid: int,
|
|||
|
|
) -> None:
|
|||
|
|
"""尝试用一个 64-hex enc_key 匹配所有剩余 salt。"""
|
|||
|
|
if not remaining:
|
|||
|
|
return
|
|||
|
|
try:
|
|||
|
|
enc_key = bytes.fromhex(enc_key_hex)
|
|||
|
|
except ValueError:
|
|||
|
|
return
|
|||
|
|
for _rel, _path, _sz, salt_hex, page1 in db_files:
|
|||
|
|
if salt_hex not in remaining:
|
|||
|
|
continue
|
|||
|
|
if _verify_enc_key(enc_key, page1):
|
|||
|
|
key_map[salt_hex] = enc_key_hex
|
|||
|
|
remaining.discard(salt_hex)
|
|||
|
|
_logger.info(
|
|||
|
|
"找到 enc_key: salt=%s PID=%s addr=0x%016x",
|
|||
|
|
salt_hex,
|
|||
|
|
pid,
|
|||
|
|
addr,
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
def _cross_verify(
|
|||
|
|
self,
|
|||
|
|
db_files: list[tuple[str, str, int, str, bytes]],
|
|||
|
|
key_map: dict[str, str],
|
|||
|
|
remaining: set[str],
|
|||
|
|
) -> None:
|
|||
|
|
"""用已找到的 key 交叉验证剩余 salt。"""
|
|||
|
|
if not remaining or not key_map:
|
|||
|
|
return
|
|||
|
|
for _rel, _path, _sz, salt_hex, page1 in db_files:
|
|||
|
|
if salt_hex not in remaining:
|
|||
|
|
continue
|
|||
|
|
for known_salt, known_key_hex in key_map.items():
|
|||
|
|
enc_key = bytes.fromhex(known_key_hex)
|
|||
|
|
if _verify_enc_key(enc_key, page1):
|
|||
|
|
key_map[salt_hex] = known_key_hex
|
|||
|
|
remaining.discard(salt_hex)
|
|||
|
|
_logger.info(
|
|||
|
|
"交叉验证成功: salt=%s 复用 salt=%s 的 enc_key",
|
|||
|
|
salt_hex,
|
|||
|
|
known_salt,
|
|||
|
|
)
|
|||
|
|
break
|