From d38d7ebf9c9f8543c9f1dc835a598de69bd653a7 Mon Sep 17 00:00:00 2001 From: bbingz Date: Thu, 5 Mar 2026 21:52:35 +0800 Subject: [PATCH] fix: replace glob() with nftw() and add chunk overlap - glob() does not support ** recursive matching on macOS (POSIX). Replace with nftw() + opendir to recursively walk db_storage/. - Add overlap between memory chunks to catch x'...' patterns spanning chunk boundaries. --- README.md | 31 +++++++++++++ find_all_keys_macos.c | 105 +++++++++++++++++++++++++++--------------- 2 files changed, 100 insertions(+), 36 deletions(-) diff --git a/README.md b/README.md index 96f631f..e0e7371 100644 --- a/README.md +++ b/README.md @@ -194,6 +194,37 @@ V2 文件结构: `[6B signature] [4B aes_size LE] [4B xor_size LE] [1B padding]` - `media_*/media_*.db` - 媒体文件索引 - 其他: head_image, favorite, sns, emoticon 等 +## macOS 数据库密钥扫描 (WeChat 4.x) + +macOS 版微信 4.x 使用 SQLCipher 4 加密本地数据库，密钥格式为 `x'<64hex_key><32hex_salt>'`。C 版扫描器通过 Mach VM API 扫描微信进程内存提取密钥。 + +### 前置条件 + +- macOS (Apple Silicon / Intel) +- WeChat 4.x (macOS 版) +- Xcode Command Line Tools: `xcode-select --install` +- 微信需要 ad-hoc 签名（或安装了防撤回补丁）： + `sudo codesign --force --deep --sign - /Applications/WeChat.app` + +### 编译和使用 + +```bash +# 编译 +cc -O2 -o find_all_keys_macos find_all_keys_macos.c -framework Foundation + +# 运行（自动查找微信进程、扫描内存、匹配 DB salt） +sudo ./find_all_keys_macos + +# 或指定 PID +sudo ./find_all_keys_macos +``` + +输出 `all_keys.json`，格式兼容 `decrypt_db.py`，可直接用于解密： + +```bash +python3 decrypt_db.py +``` + ## 免责声明 本工具仅用于学习和研究目的，用于解密**自己的**微信数据。请遵守相关法律法规，不要用于未经授权的数据访问。 diff --git a/find_all_keys_macos.c b/find_all_keys_macos.c index 9a0471c..0da1709 100644 --- a/find_all_keys_macos.c +++ b/find_all_keys_macos.c @@ -22,8 +22,10 @@ #include #include #include -#include +#include +#include #include +#include #include #include @@ -39,6 +41,40 @@ typedef struct { char full_pragma[100]; } key_entry_t; +/* Forward declaration */ +static int read_db_salt(const char *path, char *salt_hex_out); + +/* nftw callback state for collecting DB files */ +#define MAX_DBS 256 +static char g_db_salts[MAX_DBS][33]; +static char g_db_names[MAX_DBS][256]; +static int g_db_count = 0; +static int nftw_collect_db(const char *fpath, const struct stat *sb, + int typeflag, struct FTW *ftwbuf) { + (void)sb; (void)ftwbuf; + if (typeflag != FTW_F) return 0; + size_t len = strlen(fpath); + if (len < 3 || strcmp(fpath + len - 3, ".db") != 0) return 0; + if (g_db_count >= MAX_DBS) return 0; + + char salt[33]; + if (read_db_salt(fpath, salt) != 0) return 0; + + strcpy(g_db_salts[g_db_count], salt); + /* Extract relative path from db_storage/ */ + const char *rel = strstr(fpath, "db_storage/"); + if (rel) rel += strlen("db_storage/"); + else { + rel = strrchr(fpath, '/'); + rel = rel ? rel + 1 : fpath; + } + strncpy(g_db_names[g_db_count], rel, 255); + g_db_names[g_db_count][255] = '\0'; + printf(" %s: salt=%s\n", g_db_names[g_db_count], salt); + g_db_count++; + return 0; +} + static int is_hex_char(unsigned char c) { return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'); } @@ -107,40 +143,32 @@ int main(int argc, char *argv[]) { if (!home) home = "/root"; printf("User home: %s\n", home); - /* Collect DB salts */ + /* Collect DB salts by recursively walking db_storage directories. + * Note: POSIX glob() does not support ** recursive matching on macOS, + * so we use nftw() to walk the directory tree instead. */ printf("\nScanning for DB files...\n"); - glob_t g; - char pattern[512]; - snprintf(pattern, sizeof(pattern), - "%s/Library/Containers/com.tencent.xinWeChat/Data/Documents/" - "xwechat_files/*/db_storage/**/*.db", + char db_base_dir[512]; + snprintf(db_base_dir, sizeof(db_base_dir), + "%s/Library/Containers/com.tencent.xinWeChat/Data/Documents/xwechat_files", home); - char db_salts[64][33]; - char db_names[64][256]; /* relative path from db_storage, e.g. "contact/contact.db" */ - int db_count = 0; - - if (glob(pattern, GLOB_NOSORT, NULL, &g) == 0) { - for (size_t i = 0; i < g.gl_pathc && db_count < 64; i++) { - char salt[33]; - if (read_db_salt(g.gl_pathv[i], salt) == 0) { - strcpy(db_salts[db_count], salt); - /* Extract relative path from db_storage/ */ - const char *rel = strstr(g.gl_pathv[i], "db_storage/"); - if (rel) rel += strlen("db_storage/"); - else { - rel = strrchr(g.gl_pathv[i], '/'); - rel = rel ? rel + 1 : g.gl_pathv[i]; - } - strncpy(db_names[db_count], rel, 255); - db_names[db_count][255] = '\0'; - printf(" %s: salt=%s\n", db_names[db_count], salt); - db_count++; + /* Walk each account's db_storage directory */ + DIR *xdir = opendir(db_base_dir); + if (xdir) { + struct dirent *ent; + while ((ent = readdir(xdir)) != NULL) { + if (ent->d_name[0] == '.') continue; + char storage_path[768]; + snprintf(storage_path, sizeof(storage_path), + "%s/%s/db_storage", db_base_dir, ent->d_name); + struct stat st; + if (stat(storage_path, &st) == 0 && S_ISDIR(st.st_mode)) { + nftw(storage_path, nftw_collect_db, 20, FTW_PHYS); } } - globfree(&g); + closedir(xdir); } - printf("Found %d encrypted DBs\n", db_count); + printf("Found %d encrypted DBs\n", g_db_count); /* Scan memory for x' patterns */ printf("\nScanning memory for keys...\n"); @@ -222,7 +250,12 @@ int main(int argc, char *argv[]) { } mach_vm_deallocate(mach_task_self(), data, dc); } - ca += cs; + /* Advance with overlap to catch patterns spanning chunk boundaries. + * Pattern is x'<96 hex chars>' = 99 bytes total. */ + if (cs > HEX_PATTERN_LEN + 3) + ca += cs - (HEX_PATTERN_LEN + 3); + else + ca += cs; } } addr += size; @@ -241,9 +274,9 @@ int main(int argc, char *argv[]) { int matched = 0; for (int i = 0; i < key_count; i++) { const char *db = NULL; - for (int j = 0; j < db_count; j++) { - if (strcmp(keys[i].salt_hex, db_salts[j]) == 0) { - db = db_names[j]; + for (int j = 0; j < g_db_count; j++) { + if (strcmp(keys[i].salt_hex, g_db_salts[j]) == 0) { + db = g_db_names[j]; matched++; break; } @@ -267,9 +300,9 @@ int main(int argc, char *argv[]) { int first = 1; for (int i = 0; i < key_count; i++) { const char *db = NULL; - for (int j = 0; j < db_count; j++) { - if (strcmp(keys[i].salt_hex, db_salts[j]) == 0) { - db = db_names[j]; + for (int j = 0; j < g_db_count; j++) { + if (strcmp(keys[i].salt_hex, g_db_salts[j]) == 0) { + db = g_db_names[j]; break; } }