Magisk/native/jni/core/db.cpp
2020-12-02 00:55:22 -08:00

404 lines
9.9 KiB
C++

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <dlfcn.h>
#include <sys/stat.h>
#include <magisk.hpp>
#include <db.hpp>
#include <daemon.hpp>
#include <utils.hpp>
#define DB_VERSION 10
using namespace std;
typedef struct sqlite3 sqlite3;
static sqlite3 *mDB = nullptr;
// SQLite APIs
#define SQLITE_OPEN_READWRITE 0x00000002 /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_CREATE 0x00000004 /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_FULLMUTEX 0x00010000 /* Ok for sqlite3_open_v2() */
static int (*sqlite3_open_v2)(
const char *filename,
sqlite3 **ppDb,
int flags,
const char *zVfs);
static const char *(*sqlite3_errmsg)(sqlite3 *db);
static int (*sqlite3_close)(sqlite3 *db);
static void (*sqlite3_free)(void *v);
static int (*sqlite3_exec)(
sqlite3 *db,
const char *sql,
int (*callback)(void*, int, char**, char**),
void *v,
char **errmsg);
// Internal Android linker APIs
static void (*android_get_LD_LIBRARY_PATH)(char *buffer, size_t buffer_size);
static void (*android_update_LD_LIBRARY_PATH)(const char *ld_library_path);
#define DLERR(ptr) if (!(ptr)) { \
LOGE("db: %s\n", dlerror()); \
return false; \
}
#define DLOAD(handle, arg) {\
auto f = dlsym(handle, #arg); \
DLERR(f) \
*(void **) &(arg) = f; \
}
#ifdef __LP64__
constexpr char apex_path[] = "/apex/com.android.runtime/lib64:/apex/com.android.art/lib64:/apex/com.android.i18n/lib64";
#else
constexpr char apex_path[] = "/apex/com.android.runtime/lib:/apex/com.android.art/lib:/apex/com.android.i18n/lib:";
#endif
static int dl_init = 0;
static bool dload_sqlite() {
if (dl_init)
return dl_init > 0;
dl_init = -1;
auto sqlite = dlopen("libsqlite.so", RTLD_LAZY);
if (!sqlite) {
// Should only happen on Android 10+
auto dl = dlopen("libdl_android.so", RTLD_LAZY);
DLERR(dl);
DLOAD(dl, android_get_LD_LIBRARY_PATH);
DLOAD(dl, android_update_LD_LIBRARY_PATH);
// Inject APEX into LD_LIBRARY_PATH
char ld_path[4096];
memcpy(ld_path, apex_path, sizeof(apex_path));
constexpr int len = sizeof(apex_path) - 1;
android_get_LD_LIBRARY_PATH(ld_path + len, sizeof(ld_path) - len);
android_update_LD_LIBRARY_PATH(ld_path);
sqlite = dlopen("libsqlite.so", RTLD_LAZY);
// Revert LD_LIBRARY_PATH just in case
android_update_LD_LIBRARY_PATH(ld_path + len);
}
DLERR(sqlite);
DLOAD(sqlite, sqlite3_open_v2);
DLOAD(sqlite, sqlite3_errmsg);
DLOAD(sqlite, sqlite3_close);
DLOAD(sqlite, sqlite3_exec);
DLOAD(sqlite, sqlite3_free);
dl_init = 1;
return true;
}
int db_strings::getKeyIdx(string_view key) const {
int idx = DB_STRING_NUM;
for (int i = 0; i < DB_STRING_NUM; ++i) {
if (key == DB_STRING_KEYS[i])
idx = i;
}
return idx;
}
db_settings::db_settings() {
// Default settings
data[ROOT_ACCESS] = ROOT_ACCESS_APPS_AND_ADB;
data[SU_MULTIUSER_MODE] = MULTIUSER_MODE_OWNER_ONLY;
data[SU_MNT_NS] = NAMESPACE_MODE_REQUESTER;
data[HIDE_CONFIG] = false;
}
int db_settings::getKeyIdx(string_view key) const {
int idx = DB_SETTINGS_NUM;
for (int i = 0; i < DB_SETTINGS_NUM; ++i) {
if (key == DB_SETTING_KEYS[i])
idx = i;
}
return idx;
}
static int ver_cb(void *ver, int, char **data, char **) {
*((int *) ver) = parse_int(data[0]);
return 0;
}
#define err_ret(e) if (e) return e;
static char *open_and_init_db(sqlite3 *&db) {
if (!dload_sqlite())
return strdup("Cannot load libsqlite.so");
int ret = sqlite3_open_v2(MAGISKDB, &db,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_FULLMUTEX, nullptr);
if (ret)
return strdup(sqlite3_errmsg(db));
int ver;
bool upgrade = false;
char *err;
sqlite3_exec(db, "PRAGMA user_version", ver_cb, &ver, &err);
err_ret(err);
if (ver > DB_VERSION) {
// Don't support downgrading database
sqlite3_close(db);
return nullptr;
}
if (ver < 3) {
// Policies
sqlite3_exec(db,
"CREATE TABLE IF NOT EXISTS policies "
"(uid INT, package_name TEXT, policy INT, until INT, "
"logging INT, notification INT, PRIMARY KEY(uid))",
nullptr, nullptr, &err);
err_ret(err);
// Settings
sqlite3_exec(db,
"CREATE TABLE IF NOT EXISTS settings "
"(key TEXT, value INT, PRIMARY KEY(key))",
nullptr, nullptr, &err);
err_ret(err);
ver = 3;
upgrade = true;
}
if (ver < 4) {
// Strings
sqlite3_exec(db,
"CREATE TABLE IF NOT EXISTS strings "
"(key TEXT, value TEXT, PRIMARY KEY(key))",
nullptr, nullptr, &err);
err_ret(err);
ver = 4;
upgrade = true;
}
if (ver < 5) {
sqlite3_exec(db, "UPDATE policies SET uid=uid%100000", nullptr, nullptr, &err);
err_ret(err);
/* Directly jump to version 6 */
ver = 6;
upgrade = true;
}
if (ver < 7) {
sqlite3_exec(db,
"CREATE TABLE IF NOT EXISTS hidelist "
"(package_name TEXT, process TEXT, PRIMARY KEY(package_name, process));",
nullptr, nullptr, &err);
err_ret(err);
/* Directly jump to version 9 */
ver = 9;
upgrade = true;
}
if (ver < 8) {
sqlite3_exec(db,
"BEGIN TRANSACTION;"
"ALTER TABLE hidelist RENAME TO hidelist_tmp;"
"CREATE TABLE IF NOT EXISTS hidelist "
"(package_name TEXT, process TEXT, PRIMARY KEY(package_name, process));"
"INSERT INTO hidelist SELECT process as package_name, process FROM hidelist_tmp;"
"DROP TABLE hidelist_tmp;"
"COMMIT;",
nullptr, nullptr, &err);
err_ret(err);
/* Directly jump to version 9 */
ver = 9;
upgrade = true;
}
if (ver < 9) {
sqlite3_exec(db,
"BEGIN TRANSACTION;"
"ALTER TABLE hidelist RENAME TO hidelist_tmp;"
"CREATE TABLE IF NOT EXISTS hidelist "
"(package_name TEXT, process TEXT, PRIMARY KEY(package_name, process));"
"INSERT INTO hidelist SELECT * FROM hidelist_tmp;"
"DROP TABLE hidelist_tmp;"
"COMMIT;",
nullptr, nullptr, &err);
err_ret(err);
ver = 9;
upgrade = true;
}
if (ver < 10) {
sqlite3_exec(db, "DROP TABLE IF EXISTS logs", nullptr, nullptr, &err);
err_ret(err);
ver = 10;
upgrade = true;
}
if (upgrade) {
// Set version
char query[32];
sprintf(query, "PRAGMA user_version=%d", ver);
sqlite3_exec(db, query, nullptr, nullptr, &err);
err_ret(err);
}
return nullptr;
}
char *db_exec(const char *sql) {
char *err;
if (mDB == nullptr) {
err = open_and_init_db(mDB);
db_err_cmd(err,
// Open fails, remove and reconstruct
unlink(MAGISKDB);
err = open_and_init_db(mDB);
err_ret(err);
);
}
if (mDB) {
sqlite3_exec(mDB, sql, nullptr, nullptr, &err);
return err;
}
return nullptr;
}
char *db_exec(const char *sql, const db_row_cb &fn) {
char *err;
if (mDB == nullptr) {
err = open_and_init_db(mDB);
db_err_cmd(err,
// Open fails, remove and reconstruct
unlink(MAGISKDB);
err = open_and_init_db(mDB);
err_ret(err);
);
}
if (mDB) {
sqlite3_exec(mDB, sql, [](void *cb, int col_num, char **data, char **col_name) -> int {
auto &func = *reinterpret_cast<const db_row_cb*>(cb);
db_row row;
for (int i = 0; i < col_num; ++i)
row[col_name[i]] = data[i];
return func(row) ? 0 : 1;
}, (void *) &fn, &err);
return err;
}
return nullptr;
}
int get_db_settings(db_settings &cfg, int key) {
char *err;
auto settings_cb = [&](db_row &row) -> bool {
cfg[row["key"]] = parse_int(row["value"]);
LOGD("magiskdb: query %s=[%s]\n", row["key"].data(), row["value"].data());
return true;
};
if (key >= 0) {
char query[128];
sprintf(query, "SELECT key, value FROM settings WHERE key='%s'", DB_SETTING_KEYS[key]);
err = db_exec(query, settings_cb);
} else {
err = db_exec("SELECT key, value FROM settings", settings_cb);
}
db_err_cmd(err, return 1);
return 0;
}
int get_db_strings(db_strings &str, int key) {
char *err;
auto string_cb = [&](db_row &row) -> bool {
str[row["key"]] = row["value"];
return true;
};
if (key >= 0) {
char query[128];
sprintf(query, "SELECT key, value FROM strings WHERE key='%s'", DB_STRING_KEYS[key]);
err = db_exec(query, string_cb);
} else {
err = db_exec("SELECT key, value FROM strings", string_cb);
}
db_err_cmd(err, return 1);
return 0;
}
int get_uid_policy(su_access &su, int uid) {
char query[256], *err;
sprintf(query, "SELECT policy, logging, notification FROM policies "
"WHERE uid=%d AND (until=0 OR until>%li)", uid, time(nullptr));
err = db_exec(query, [&](db_row &row) -> bool {
su.policy = (policy_t) parse_int(row["policy"]);
su.log = parse_int(row["logging"]);
su.notify = parse_int(row["notification"]);
LOGD("magiskdb: query policy=[%d] log=[%d] notify=[%d]\n", su.policy, su.log, su.notify);
return true;
});
db_err_cmd(err, return 1);
return 0;
}
bool check_manager(string *pkg) {
db_strings str;
get_db_strings(str, SU_MANAGER);
bool ret = validate_manager(str[SU_MANAGER], 0, nullptr);
if (pkg) {
if (ret)
pkg->swap(str[SU_MANAGER]);
else
*pkg = "xxx"; /* Make sure the return pkg can never exist */
}
return ret;
}
bool validate_manager(string &pkg, int userid, struct stat *st) {
struct stat tmp_st;
if (st == nullptr)
st = &tmp_st;
// Prefer DE storage
char app_path[128];
sprintf(app_path, "%s/%d/%s", APP_DATA_DIR, userid, pkg.data());
if (pkg.empty() || stat(app_path, st)) {
// Check the official package name
sprintf(app_path, "%s/%d/" JAVA_PACKAGE_NAME, APP_DATA_DIR, userid);
if (stat(app_path, st)) {
LOGE("su: cannot find manager\n");
memset(st, 0, sizeof(*st));
pkg.clear();
return false;
} else {
// Switch to official package if exists
pkg = JAVA_PACKAGE_NAME;
}
}
return true;
}
void exec_sql(int client) {
run_finally f([=]{ close(client); });
char *sql = read_string(client);
char *err = db_exec(sql, [&](db_row &row) -> bool {
string out;
bool first = true;
for (auto it : row) {
if (first) first = false;
else out += '|';
out += it.first;
out += '=';
out += it.second;
}
write_int(client, out.length());
xwrite(client, out.data(), out.length());
return true;
});
free(sql);
write_int(client, 0);
db_err_cmd(err, return; );
}
bool db_err(char *e) {
if (e) {
LOGE("sqlite3_exec: %s\n", e);
sqlite3_free(e);
return true;
}
return false;
}