Magisk/native/jni/magiskhide/hide_utils.cpp

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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 <libgen.h>
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#include <sys/types.h>
#include <sys/stat.h>
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#include "magisk.h"
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#include "utils.h"
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#include "resetprop.h"
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#include "magiskhide.h"
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#include "daemon.h"
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#include "db.h"
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#define SAFETYNET_COMPONENT "com.google.android.gms/.droidguard.DroidGuardService"
#define SAFETYNET_PROCESS "com.google.android.gms.unstable"
Vector<CharArray> hide_list;
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pthread_mutex_t list_lock;
static pthread_t proc_monitor_thread;
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static const char *prop_key[] =
{ "ro.boot.vbmeta.device_state", "ro.boot.verifiedbootstate", "ro.boot.flash.locked",
"ro.boot.veritymode", "ro.boot.warranty_bit", "ro.warranty_bit", "ro.debuggable",
"ro.secure", "ro.build.type", "ro.build.tags", "ro.build.selinux", nullptr };
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static const char *prop_value[] =
{ "locked", "green", "1",
"enforcing", "0", "0", "0",
"1", "user", "release-keys", "0", nullptr };
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struct ps_arg {
const char *name;
uid_t uid;
};
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void manage_selinux() {
char val;
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int fd = xopen(SELINUX_ENFORCE, O_RDONLY);
xxread(fd, &val, sizeof(val));
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close(fd);
// Permissive
if (val == '0') {
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chmod(SELINUX_ENFORCE, 0640);
chmod(SELINUX_POLICY, 0440);
}
}
void hide_sensitive_props() {
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LOGI("hide_utils: Hiding sensitive props\n");
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// Hide all sensitive props
for (int i = 0; prop_key[i]; ++i) {
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CharArray value = getprop(prop_key[i]);
if (!value.empty() && value != prop_value[i])
setprop(prop_key[i], prop_value[i], false);
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}
}
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static bool is_digits(const char *s) {
for (const char *c = s; *c; ++c) {
if (*c < '0' || *c > '9')
return false;
}
return true;
}
static void ps(void (*cb)(int, void*), void *arg) {
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DIR *dir;
struct dirent *entry;
if (!(dir = xopendir("/proc")))
return;
while ((entry = xreaddir(dir))) {
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if (entry->d_type == DT_DIR && is_digits(entry->d_name))
cb(atoi(entry->d_name), arg);
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}
closedir(dir);
}
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static bool proc_name_match(int pid, const char *name) {
char buf[4019];
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FILE *f;
sprintf(buf, "/proc/%d/comm", pid);
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if ((f = fopen(buf, "re"))) {
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fgets(buf, sizeof(buf), f);
if (strcmp(buf, name) == 0)
return true;
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} else {
// The PID is already killed
return false;
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}
fclose(f);
sprintf(buf, "/proc/%d/cmdline", pid);
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if ((f = fopen(buf, "re"))) {
fgets(buf, sizeof(buf), f);
if (strcmp(basename(buf), name) == 0)
return true;
} else {
// The PID is already killed
return false;
}
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fclose(f);
sprintf(buf, "/proc/%d/exe", pid);
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ssize_t len;
if ((len = readlink(buf, buf, sizeof(buf))) < 0)
return false;
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buf[len] = '\0';
return strcmp(basename(buf), name) == 0;
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}
static void kill_proc_cb(int pid, void *v) {
ps_arg *args = static_cast<ps_arg *>(v);
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if (proc_name_match(pid, args->name))
kill(pid, SIGTERM);
else if (args->uid > 0) {
char buf[64];
struct stat st;
sprintf(buf, "/proc/%d", pid);
stat(buf, &st);
if (args->uid == st.st_uid)
kill(pid, SIGTERM);
}
}
static void kill_process(const char *name) {
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ps_arg args;
char *slash = nullptr;
if (strcmp(name, SAFETYNET_COMPONENT) == 0) {
// We do NOT want to kill gms, it will cause massive system crashes
args.name = SAFETYNET_PROCESS;
} else {
// Only leave the package name part of component name temporarily
slash = strchr((char *)name, '/');
if (slash)
*slash = '\0';
args.name = name;
}
struct stat st;
int fd = xopen("/data/data", O_RDONLY | O_CLOEXEC);
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if (fstatat(fd, args.name, &st, 0) == 0)
args.uid = st.st_uid;
else
args.uid = 0;
close(fd);
ps(kill_proc_cb, &args);
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// Revert back to component name
if (slash)
*slash = '/';
}
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void clean_magisk_props() {
LOGD("hide_utils: Cleaning magisk props\n");
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getprop([](const char *name, auto, auto) -> void {
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if (strstr(name, "magisk"))
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deleteprop(name);
}, nullptr, false);
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}
int add_list(const char *proc) {
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for (auto &s : hide_list) {
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// They should be unique
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if (s == proc)
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return HIDE_ITEM_EXIST;
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}
LOGI("hide_list add: [%s]\n", proc);
// Add to database
char sql[4096];
snprintf(sql, sizeof(sql), "INSERT INTO hidelist (process) VALUES('%s')", proc);
char *err = db_exec(sql);
db_err_cmd(err, return DAEMON_ERROR);
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// Critical region
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pthread_mutex_lock(&list_lock);
hide_list.push_back(proc);
kill_process(proc);
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pthread_mutex_unlock(&list_lock);
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return DAEMON_SUCCESS;
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}
int add_list(int client) {
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char *proc = read_string(client);
int ret = add_list(proc);
free(proc);
return ret;
}
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static int rm_list(const char *proc) {
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// Update list in critical region
bool do_rm = false;
pthread_mutex_lock(&list_lock);
for (auto it = hide_list.begin(); it != hide_list.end(); ++it) {
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if (*it == proc) {
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do_rm = true;
LOGI("hide_list rm: [%s]\n", proc);
hide_list.erase(it);
kill_process(proc);
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break;
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}
}
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pthread_mutex_unlock(&list_lock);
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if (do_rm) {
char sql[4096];
snprintf(sql, sizeof(sql), "DELETE FROM hidelist WHERE process='%s'", proc);
char *err = db_exec(sql);
db_err(err);
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return DAEMON_SUCCESS;
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} else {
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return HIDE_ITEM_NOT_EXIST;
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}
}
int rm_list(int client) {
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char *proc = read_string(client);
int ret = rm_list(proc);
free(proc);
return ret;
}
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#define LEGACY_LIST MOUNTPOINT "/.core/hidelist"
static int collect_list(void *, int, char **data, char**) {
LOGI("hide_list: [%s]\n", data[0]);
hide_list.push_back(data[0]);
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kill_process(data[0]);
return 0;
}
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bool init_list() {
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LOGD("hide_list: initialize\n");
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char *err = db_exec("SELECT process FROM hidelist", collect_list);
db_err_cmd(err, return false);
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// Migrate old hide list into database
if (access(LEGACY_LIST, R_OK) == 0) {
Vector<CharArray> tmp;
file_to_vector(LEGACY_LIST, tmp);
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for (auto &s : tmp)
add_list(s);
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unlink(LEGACY_LIST);
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}
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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");
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for (auto &s : hide_list)
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fprintf(out, "%s\n", s.c_str());
fclose(out);
write_int(client, DAEMON_SUCCESS);
close(client);
}
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static void set_hide_config() {
char sql[64];
sprintf(sql, "REPLACE INTO settings (key,value) VALUES('%s',%d)",
DB_SETTING_KEYS[HIDE_CONFIG], hide_enabled);
char *err = db_exec(sql);
db_err(err);
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}
int launch_magiskhide(int client) {
if (hide_enabled)
return HIDE_IS_ENABLED;
if (!log_daemon_started)
return LOGCAT_DISABLED;
hide_enabled = true;
set_hide_config();
LOGI("* Starting MagiskHide\n");
hide_sensitive_props();
// Initialize the mutex lock
pthread_mutex_init(&list_lock, nullptr);
// Initialize the hide list
if (!init_list())
goto error;
// Add SafetyNet by default
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rm_list(SAFETYNET_PROCESS);
add_list(SAFETYNET_COMPONENT);
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// Get thread reference
proc_monitor_thread = pthread_self();
if (client >= 0) {
write_int(client, DAEMON_SUCCESS);
close(client);
}
// Start monitoring
proc_monitor();
error:
hide_enabled = false;
return DAEMON_ERROR;
}
int stop_magiskhide() {
LOGI("* Stopping MagiskHide\n");
hide_enabled = false;
set_hide_config();
pthread_kill(proc_monitor_thread, TERM_THREAD);
return DAEMON_SUCCESS;
}
void auto_start_magiskhide() {
if (!start_log_daemon())
return;
db_settings dbs;
get_db_settings(&dbs, HIDE_CONFIG);
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if (dbs[HIDE_CONFIG]) {
pthread_t thread;
xpthread_create(&thread, nullptr, [](void*) -> void* {
launch_magiskhide(-1);
return nullptr;
}, nullptr);
pthread_detach(thread);
}
}