Magisk/native/jni/core/restorecon.cpp

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#include <string_view>
#include <magisk.hpp>
#include <selinux.hpp>
#include <utils.hpp>
using namespace std;
#define UNLABEL_CON "u:object_r:unlabeled:s0"
#define SYSTEM_CON "u:object_r:system_file:s0"
#define ADB_CON "u:object_r:adb_data_file:s0"
#define ROOT_CON "u:object_r:rootfs:s0"
#define MAGISK_CON "u:object_r:" SEPOL_FILE_TYPE ":s0"
#define EXEC_CON "u:object_r:" SEPOL_EXEC_TYPE ":s0"
static void restore_syscon(int dirfd) {
struct dirent *entry;
DIR *dir;
char *con;
if (fgetfilecon(dirfd, &con) >= 0) {
if (strlen(con) == 0 || strcmp(con, UNLABEL_CON) == 0)
fsetfilecon(dirfd, SYSTEM_CON);
freecon(con);
}
dir = xfdopendir(dirfd);
while ((entry = xreaddir(dir))) {
int fd = openat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC);
if (entry->d_type == DT_DIR) {
restore_syscon(fd);
} else if (entry->d_type == DT_REG) {
if (fgetfilecon(fd, &con) >= 0) {
if (con[0] == '\0' || strcmp(con, UNLABEL_CON) == 0)
fsetfilecon(fd, SYSTEM_CON);
freecon(con);
}
} else if (entry->d_type == DT_LNK) {
getfilecon_at(dirfd, entry->d_name, &con);
if (con[0] == '\0' || strcmp(con, UNLABEL_CON) == 0)
setfilecon_at(dirfd, entry->d_name, con);
freecon(con);
}
close(fd);
}
}
static void restore_magiskcon(int dirfd) {
struct dirent *entry;
DIR *dir;
fsetfilecon(dirfd, MAGISK_CON);
fchown(dirfd, 0, 0);
dir = xfdopendir(dirfd);
while ((entry = xreaddir(dir))) {
int fd = xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC);
if (entry->d_type == DT_DIR) {
restore_magiskcon(fd);
} else if (entry->d_type) {
fsetfilecon(fd, MAGISK_CON);
fchown(fd, 0, 0);
}
close(fd);
}
}
void restorecon() {
int fd = xopen(SELINUX_CONTEXT, O_WRONLY | O_CLOEXEC);
if (write(fd, ADB_CON, sizeof(ADB_CON)) >= 0)
lsetfilecon(SECURE_DIR, ADB_CON);
close(fd);
lsetfilecon(MODULEROOT, SYSTEM_CON);
fd = xopen(MODULEROOT, O_RDONLY | O_CLOEXEC);
restore_syscon(fd);
close(fd);
fd = xopen(DATABIN, O_RDONLY | O_CLOEXEC);
restore_magiskcon(fd);
close(fd);
}
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void restore_tmpcon() {
if (MAGISKTMP == "/system/bin") {
// Running with emulator.sh
if (SDK_INT >= 26)
lsetfilecon("/system/bin/magisk", EXEC_CON);
return;
}
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if (MAGISKTMP == "/sbin")
setfilecon(MAGISKTMP.data(), ROOT_CON);
else
chmod(MAGISKTMP.data(), 0700);
auto dir = xopen_dir(MAGISKTMP.data());
int dfd = dirfd(dir.get());
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for (dirent *entry; (entry = xreaddir(dir.get()));)
setfilecon_at(dfd, entry->d_name, SYSTEM_CON);
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if (SDK_INT >= 26) {
string magisk = MAGISKTMP + "/magisk";
setfilecon(magisk.data(), EXEC_CON);
}
}