Magisk/native/jni/magiskhide/hide_utils.cpp

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#include <sys/types.h>
#include <sys/stat.h>
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#include <stdio.h>
#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <dirent.h>
#include <string.h>
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#include <magisk.hpp>
#include <utils.hpp>
#include <db.hpp>
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#include "magiskhide.hpp"
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using namespace std;
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static pthread_t proc_monitor_thread;
static bool hide_state = false;
// This locks the 2 variables above
static pthread_mutex_t hide_state_lock = PTHREAD_MUTEX_INITIALIZER;
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// Leave /proc fd opened as we're going to read from it repeatedly
static DIR *procfp;
void crawl_procfs(const function<bool(int)> &fn) {
rewinddir(procfp);
crawl_procfs(procfp, fn);
}
void crawl_procfs(DIR *dir, const function<bool(int)> &fn) {
struct dirent *dp;
int pid;
while ((dp = readdir(dir))) {
pid = parse_int(dp->d_name);
if (pid > 0 && !fn(pid))
break;
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}
}
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bool hide_enabled() {
mutex_guard g(hide_state_lock);
return hide_state;
}
void set_hide_state(bool state) {
mutex_guard g(hide_state_lock);
hide_state = state;
}
static bool proc_name_match(int pid, const char *name) {
char buf[4019];
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sprintf(buf, "/proc/%d/cmdline", pid);
if (FILE *f = fopen(buf, "re")) {
fgets(buf, sizeof(buf), f);
fclose(f);
if (strcmp(buf, name) == 0)
return true;
}
return false;
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}
static void kill_process(const char *name, bool multi = false) {
crawl_procfs([=](int pid) -> bool {
if (proc_name_match(pid, name)) {
if (kill(pid, SIGTERM) == 0)
LOGD("hide_utils: killed PID=[%d] (%s)\n", pid, name);
return multi;
}
return true;
});
}
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static bool validate(const char *s) {
bool dot = false;
for (char c; (c = *s); ++s) {
if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9') || c == '_' || c == ':') {
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continue;
}
if (c == '.') {
dot = true;
continue;
}
return false;
}
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return dot;
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}
static int add_list(const char *pkg, const char *proc = "") {
if (proc[0] == '\0')
proc = pkg;
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if (!validate(pkg) || !validate(proc))
return HIDE_INVALID_PKG;
for (auto &hide : hide_set)
if (hide.first == pkg && hide.second == proc)
return HIDE_ITEM_EXIST;
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// Add to database
char sql[4096];
snprintf(sql, sizeof(sql),
"INSERT INTO hidelist (package_name, process) VALUES('%s', '%s')", pkg, proc);
char *err = db_exec(sql);
db_err_cmd(err, return DAEMON_ERROR);
LOGI("hide_list add: [%s/%s]\n", pkg, proc);
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// Critical region
{
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mutex_guard lock(monitor_lock);
hide_set.emplace(pkg, proc);
}
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kill_process(proc);
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return DAEMON_SUCCESS;
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}
int add_list(int client) {
char *pkg = read_string(client);
char *proc = read_string(client);
int ret = add_list(pkg, proc);
free(pkg);
free(proc);
update_uid_map();
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return ret;
}
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static int rm_list(const char *pkg, const char *proc = "") {
{
// Critical region
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mutex_guard lock(monitor_lock);
bool remove = false;
for (auto it = hide_set.begin(); it != hide_set.end();) {
if (it->first == pkg && (proc[0] == '\0' || it->second == proc)) {
remove = true;
LOGI("hide_list rm: [%s]\n", it->second.data());
it = hide_set.erase(it);
} else {
++it;
}
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}
if (!remove)
return HIDE_ITEM_NOT_EXIST;
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}
char sql[4096];
if (proc[0] == '\0')
snprintf(sql, sizeof(sql), "DELETE FROM hidelist WHERE package_name='%s'", pkg);
else
snprintf(sql, sizeof(sql),
"DELETE FROM hidelist WHERE package_name='%s' AND process='%s'", pkg, proc);
char *err = db_exec(sql);
db_err(err);
return DAEMON_SUCCESS;
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}
int rm_list(int client) {
char *pkg = read_string(client);
char *proc = read_string(client);
int ret = rm_list(pkg, proc);
free(pkg);
free(proc);
if (ret == DAEMON_SUCCESS)
update_uid_map();
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return ret;
}
static void init_list(const char *pkg, const char *proc) {
LOGI("hide_list init: [%s/%s]\n", pkg, proc);
hide_set.emplace(pkg, proc);
kill_process(proc);
}
#define SNET_PROC "com.google.android.gms.unstable"
#define GMS_PKG "com.google.android.gms"
#define MICROG_PKG "org.microg.gms.droidguard"
static bool init_list() {
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LOGD("hide_list: initialize\n");
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char *err = db_exec("SELECT * FROM hidelist", [](db_row &row) -> bool {
init_list(row["package_name"].data(), row["process"].data());
return true;
});
db_err_cmd(err, return false);
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// If Android Q+, also kill blastula pool
if (SDK_INT >= 29) {
kill_process("usap32", true);
kill_process("usap64", true);
}
// Add SafetyNet by default
init_list(GMS_PKG, SNET_PROC);
init_list(MICROG_PKG, SNET_PROC);
// We also need to hide the default GMS process if MAGISKTMP != /sbin
// The snet process communicates with the main process and get additional info
if (MAGISKTMP != "/sbin")
init_list(GMS_PKG, GMS_PKG);
update_uid_map();
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return true;
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}
void ls_list(int client) {
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FILE *out = fdopen(recv_fd(client), "a");
for (auto &hide : hide_set)
fprintf(out, "%s|%s\n", hide.first.data(), hide.second.data());
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fclose(out);
write_int(client, DAEMON_SUCCESS);
close(client);
}
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static void update_hide_config() {
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char sql[64];
sprintf(sql, "REPLACE INTO settings (key,value) VALUES('%s',%d)",
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DB_SETTING_KEYS[HIDE_CONFIG], hide_state);
char *err = db_exec(sql);
db_err(err);
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}
int launch_magiskhide() {
mutex_guard g(hide_state_lock);
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if (SDK_INT < 19)
return DAEMON_ERROR;
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if (hide_state)
return HIDE_IS_ENABLED;
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if (access("/proc/1/ns/mnt", F_OK) != 0)
return HIDE_NO_NS;
if (procfp == nullptr && (procfp = opendir("/proc")) == nullptr)
return DAEMON_ERROR;
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LOGI("* Starting MagiskHide\n");
// Initialize the mutex lock
pthread_mutex_init(&monitor_lock, nullptr);
// Initialize the hide list
if (!init_list())
return DAEMON_ERROR;
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hide_sensitive_props();
if (DAEMON_STATE >= STATE_BOOT_COMPLETE || DAEMON_STATE == STATE_NONE)
hide_late_sensitive_props();
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// Start monitoring
void *(*start)(void*) = [](void*) -> void* { proc_monitor(); return nullptr; };
if (xpthread_create(&proc_monitor_thread, nullptr, start, nullptr))
return DAEMON_ERROR;
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hide_state = true;
update_hide_config();
return DAEMON_SUCCESS;
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}
int stop_magiskhide() {
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mutex_guard g(hide_state_lock);
if (hide_state) {
LOGI("* Stopping MagiskHide\n");
pthread_kill(proc_monitor_thread, SIGTERMTHRD);
}
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hide_state = false;
update_hide_config();
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return DAEMON_SUCCESS;
}
void auto_start_magiskhide() {
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if (hide_enabled()) {
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pthread_kill(proc_monitor_thread, SIGALRM);
hide_late_sensitive_props();
} else if (SDK_INT >= 19) {
db_settings dbs;
get_db_settings(dbs, HIDE_CONFIG);
if (dbs[HIDE_CONFIG])
launch_magiskhide();
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}
}
void test_proc_monitor() {
if (procfp == nullptr && (procfp = opendir("/proc")) == nullptr)
exit(1);
proc_monitor();
}