384 lines
10 KiB
C++
384 lines
10 KiB
C++
#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <set>
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#include <magisk.hpp>
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#include <utils.hpp>
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#include <db.hpp>
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#include "magiskhide.hpp"
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using namespace std;
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static bool hide_state = false;
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static set<pair<string, string>> hide_set; /* set of <pkg, process> pair */
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map<int, vector<string_view>> uid_proc_map; /* uid -> list of process */
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// Locks the variables above
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pthread_mutex_t hide_state_lock = PTHREAD_MUTEX_INITIALIZER;
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void update_uid_map() {
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mutex_guard lock(hide_state_lock);
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uid_proc_map.clear();
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string data_path(APP_DATA_DIR);
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size_t len = data_path.length();
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auto dir = open_dir(APP_DATA_DIR);
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bool first_iter = true;
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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data_path.resize(len);
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data_path += '/';
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data_path += entry->d_name; // multiuser user id
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data_path += '/';
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size_t user_len = data_path.length();
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struct stat st;
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for (auto &hide : hide_set) {
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if (hide.first == ISOLATED_MAGIC) {
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if (!first_iter) continue;
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// Setup isolated processes
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uid_proc_map[-1].emplace_back(hide.second);
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}
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data_path.resize(user_len);
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data_path += hide.first;
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if (stat(data_path.data(), &st))
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continue;
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uid_proc_map[st.st_uid].emplace_back(hide.second);
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}
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first_iter = false;
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}
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}
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// Leave /proc fd opened as we're going to read from it repeatedly
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static DIR *procfp;
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void crawl_procfs(const function<bool(int)> &fn) {
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rewinddir(procfp);
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crawl_procfs(procfp, fn);
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}
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void crawl_procfs(DIR *dir, const function<bool(int)> &fn) {
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struct dirent *dp;
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int pid;
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while ((dp = readdir(dir))) {
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pid = parse_int(dp->d_name);
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if (pid > 0 && !fn(pid))
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break;
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}
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}
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bool hide_enabled() {
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mutex_guard g(hide_state_lock);
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return hide_state;
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}
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template <bool str_op(string_view, string_view)>
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static bool proc_name_match(int pid, const char *name) {
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char buf[4019];
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sprintf(buf, "/proc/%d/cmdline", pid);
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if (auto fp = open_file(buf, "re")) {
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fgets(buf, sizeof(buf), fp.get());
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if (str_op(buf, name)) {
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LOGD("hide: kill PID=[%d] (%s)\n", pid, buf);
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return true;
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}
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}
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return false;
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}
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static inline bool str_eql(string_view s, string_view ss) { return s == ss; }
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static void kill_process(const char *name, bool multi = false,
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bool (*filter)(int, const char *) = proc_name_match<&str_eql>) {
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crawl_procfs([=](int pid) -> bool {
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if (filter(pid, name)) {
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kill(pid, SIGTERM);
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return multi;
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}
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return true;
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});
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}
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static bool validate(const char *s) {
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if (strcmp(s, ISOLATED_MAGIC) == 0)
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return true;
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bool dot = false;
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for (char c; (c = *s); ++s) {
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if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') ||
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(c >= '0' && c <= '9') || c == '_' || c == ':') {
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continue;
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}
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if (SDK_INT >= 29 && c == '$')
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continue;
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if (c == '.') {
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dot = true;
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continue;
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}
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return false;
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}
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return dot;
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}
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static void add_hide_set(const char *pkg, const char *proc) {
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LOGI("hide_list add: [%s/%s]\n", pkg, proc);
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hide_set.emplace(pkg, proc);
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if (strcmp(pkg, ISOLATED_MAGIC) == 0) {
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// Kill all matching isolated processes
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kill_process(proc, true, proc_name_match<&str_starts>);
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} else {
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kill_process(proc);
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}
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}
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static int add_list(const char *pkg, const char *proc) {
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if (proc[0] == '\0')
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proc = pkg;
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if (!validate(pkg) || !validate(proc))
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return HIDE_INVALID_PKG;
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for (auto &hide : hide_set)
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if (hide.first == pkg && hide.second == proc)
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return HIDE_ITEM_EXIST;
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// Add to database
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char sql[4096];
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snprintf(sql, sizeof(sql),
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"INSERT INTO hidelist (package_name, process) VALUES('%s', '%s')", pkg, proc);
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char *err = db_exec(sql);
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db_err_cmd(err, return DAEMON_ERROR);
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{
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// Critical region
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mutex_guard lock(hide_state_lock);
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add_hide_set(pkg, proc);
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}
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return DAEMON_SUCCESS;
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}
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int add_list(int client) {
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string pkg = read_string(client);
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string proc = read_string(client);
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int ret = add_list(pkg.data(), proc.data());
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if (ret == DAEMON_SUCCESS)
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update_uid_map();
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return ret;
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}
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static int rm_list(const char *pkg, const char *proc) {
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bool remove = false;
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{
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// Critical region
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mutex_guard lock(hide_state_lock);
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for (auto it = hide_set.begin(); it != hide_set.end();) {
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if (it->first == pkg && (proc[0] == '\0' || it->second == proc)) {
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remove = true;
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LOGI("hide_list rm: [%s/%s]\n", it->first.data(), it->second.data());
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it = hide_set.erase(it);
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} else {
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++it;
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}
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}
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}
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if (!remove)
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return HIDE_ITEM_NOT_EXIST;
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char sql[4096];
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if (proc[0] == '\0')
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snprintf(sql, sizeof(sql), "DELETE FROM hidelist WHERE package_name='%s'", pkg);
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else
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snprintf(sql, sizeof(sql),
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"DELETE FROM hidelist WHERE package_name='%s' AND process='%s'", pkg, proc);
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char *err = db_exec(sql);
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db_err(err);
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return DAEMON_SUCCESS;
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}
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int rm_list(int client) {
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string pkg = read_string(client);
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string proc = read_string(client);
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int ret = rm_list(pkg.data(), proc.data());
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if (ret == DAEMON_SUCCESS)
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update_uid_map();
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return ret;
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}
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static bool str_ends_safe(string_view s, string_view ss) {
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// Never kill webview zygote
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if (s == "webview_zygote")
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return false;
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return str_ends(s, ss);
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}
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#define SNET_PROC "com.google.android.gms.unstable"
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#define GMS_PKG "com.google.android.gms"
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static bool init_list() {
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LOGD("hide: initialize\n");
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char *err = db_exec("SELECT * FROM hidelist", [](db_row &row) -> bool {
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add_hide_set(row["package_name"].data(), row["process"].data());
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return true;
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});
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db_err_cmd(err, return false);
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// If Android Q+, also kill blastula pool and all app zygotes
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if (SDK_INT >= 29) {
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kill_process("usap32", true);
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kill_process("usap64", true);
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kill_process("_zygote", true, proc_name_match<&str_ends_safe>);
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}
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// Add SafetyNet by default
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add_hide_set(GMS_PKG, SNET_PROC);
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// We also need to hide the default GMS process if MAGISKTMP != /sbin
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// The snet process communicates with the main process and get additional info
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if (MAGISKTMP != "/sbin")
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add_hide_set(GMS_PKG, GMS_PKG);
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return true;
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}
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void ls_list(int client) {
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write_int(client, DAEMON_SUCCESS);
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for (auto &hide : hide_set) {
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write_int(client, hide.first.size() + hide.second.size() + 1);
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xwrite(client, hide.first.data(), hide.first.size());
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xwrite(client, "|", 1);
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xwrite(client, hide.second.data(), hide.second.size());
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}
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write_int(client, 0);
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close(client);
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}
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static void update_hide_config() {
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char sql[64];
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sprintf(sql, "REPLACE INTO settings (key,value) VALUES('%s',%d)",
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DB_SETTING_KEYS[HIDE_CONFIG], hide_state);
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char *err = db_exec(sql);
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db_err(err);
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}
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int launch_magiskhide(bool late_props) {
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mutex_guard lock(hide_state_lock);
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if (SDK_INT < 19)
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return DAEMON_ERROR;
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if (hide_state)
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return HIDE_IS_ENABLED;
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if (access("/proc/self/ns/mnt", F_OK) != 0)
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return HIDE_NO_NS;
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if (procfp == nullptr && (procfp = opendir("/proc")) == nullptr)
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return DAEMON_ERROR;
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LOGI("* Enable MagiskHide\n");
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// Initialize the hide list
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if (!init_list())
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return DAEMON_ERROR;
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hide_sensitive_props();
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if (late_props)
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hide_late_sensitive_props();
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#if !ENABLE_INJECT
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// Start monitoring
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if (new_daemon_thread(&proc_monitor))
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return DAEMON_ERROR;
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#endif
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hide_state = true;
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update_hide_config();
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// Unlock here or else we'll be stuck in deadlock
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lock.unlock();
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update_uid_map();
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return DAEMON_SUCCESS;
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}
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int stop_magiskhide() {
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mutex_guard g(hide_state_lock);
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if (hide_state) {
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LOGI("* Disable MagiskHide\n");
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uid_proc_map.clear();
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hide_set.clear();
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#if !ENABLE_INJECT
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pthread_kill(monitor_thread, SIGTERMTHRD);
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#endif
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}
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hide_state = false;
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update_hide_config();
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return DAEMON_SUCCESS;
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}
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void auto_start_magiskhide(bool late_props) {
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if (hide_enabled()) {
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#if !ENABLE_INJECT
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pthread_kill(monitor_thread, SIGALRM);
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#endif
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hide_late_sensitive_props();
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} else if (SDK_INT >= 19) {
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db_settings dbs;
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get_db_settings(dbs, HIDE_CONFIG);
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if (dbs[HIDE_CONFIG])
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launch_magiskhide(late_props);
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}
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}
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bool is_hide_target(int uid, string_view process, int max_len) {
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mutex_guard lock(hide_state_lock);
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if (uid % 100000 >= 90000) {
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// Isolated processes
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auto it = uid_proc_map.find(-1);
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if (it == uid_proc_map.end())
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return false;
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for (auto &s : it->second) {
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if (s.length() > max_len && process.length() > max_len && str_starts(s, process))
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return true;
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if (str_starts(process, s))
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return true;
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}
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} else {
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auto it = uid_proc_map.find(uid);
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if (it == uid_proc_map.end())
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return false;
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for (auto &s : it->second) {
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if (s.length() > max_len && process.length() > max_len && str_starts(s, process))
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return true;
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if (s == process)
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return true;
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}
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}
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return false;
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}
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#if !ENABLE_INJECT
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void test_proc_monitor() {
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if (procfp == nullptr && (procfp = opendir("/proc")) == nullptr)
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exit(1);
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proc_monitor();
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}
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#endif
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#if ENABLE_INJECT
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int check_uid_map(int client) {
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if (!hide_enabled())
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return 0;
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int uid = read_int(client);
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string process = read_string(client);
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return is_hide_target(uid, process) ? 1 : 0;
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}
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#endif
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