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