355 lines
11 KiB
C++
355 lines
11 KiB
C++
#include <sys/mount.h>
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#include <libgen.h>
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#include <magisk.hpp>
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#include <magiskpolicy.hpp>
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#include <utils.hpp>
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#include <socket.hpp>
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#include "init.hpp"
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#include "magiskrc.inc"
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#ifdef USE_64BIT
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#define LIBNAME "lib64"
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#else
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#define LIBNAME "lib"
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#endif
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using namespace std;
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static vector<string> rc_list;
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static void patch_init_rc(const char *src, const char *dest, const char *tmp_dir) {
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FILE *rc = xfopen(dest, "we");
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file_readline(src, [=](string_view line) -> bool {
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// Do not start vaultkeeper
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if (str_contains(line, "start vaultkeeper")) {
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LOGD("Remove vaultkeeper\n");
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return true;
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}
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// Do not run flash_recovery
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if (str_starts(line, "service flash_recovery")) {
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LOGD("Remove flash_recovery\n");
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fprintf(rc, "service flash_recovery /system/bin/xxxxx\n");
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return true;
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}
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// Else just write the line
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fprintf(rc, "%s", line.data());
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return true;
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});
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fprintf(rc, "\n");
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// Inject custom rc scripts
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for (auto &script : rc_list) {
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// Replace template arguments of rc scripts with dynamic paths
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replace_all(script, "${MAGISKTMP}", tmp_dir);
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fprintf(rc, "\n%s\n", script.data());
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}
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rc_list.clear();
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// Inject Magisk rc scripts
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char pfd_svc[16], ls_svc[16], bc_svc[16];
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gen_rand_str(pfd_svc, sizeof(pfd_svc));
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gen_rand_str(ls_svc, sizeof(ls_svc));
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gen_rand_str(bc_svc, sizeof(bc_svc));
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LOGD("Inject magisk services: [%s] [%s] [%s]\n", pfd_svc, ls_svc, bc_svc);
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fprintf(rc, MAGISK_RC, tmp_dir, pfd_svc, ls_svc, bc_svc);
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fclose(rc);
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clone_attr(src, dest);
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}
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static void load_overlay_rc(const char *overlay) {
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auto dir = open_dir(overlay);
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if (!dir) return;
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int dfd = dirfd(dir.get());
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// Do not allow overwrite init.rc
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unlinkat(dfd, "init.rc", 0);
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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if (str_ends(entry->d_name, ".rc")) {
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LOGD("Found rc script [%s]\n", entry->d_name);
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int rc = xopenat(dfd, entry->d_name, O_RDONLY | O_CLOEXEC);
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rc_list.push_back(fd_full_read(rc));
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close(rc);
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unlinkat(dfd, entry->d_name, 0);
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}
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}
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}
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bool MagiskInit::patch_sepolicy(const char *file) {
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bool patch_init = false;
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sepolicy *sepol = nullptr;
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if (access(SPLIT_PLAT_CIL, R_OK) == 0) {
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LOGD("sepol: split policy\n");
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patch_init = true;
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} else if (access("/sepolicy", R_OK) == 0) {
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LOGD("sepol: monolithic policy\n");
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sepol = sepolicy::from_file("/sepolicy");
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} else {
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LOGD("sepol: no selinux\n");
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return false;
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}
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if (access(SELINUX_VERSION, F_OK) != 0) {
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// Mount selinuxfs to communicate with kernel
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xmount("selinuxfs", SELINUX_MNT, "selinuxfs", 0, nullptr);
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mount_list.emplace_back(SELINUX_MNT);
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}
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if (patch_init)
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sepol = sepolicy::from_split();
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sepol->magisk_rules();
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// Custom rules
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if (!custom_rules_dir.empty()) {
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if (auto dir = open_dir(custom_rules_dir.data())) {
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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auto rule = custom_rules_dir + "/" + entry->d_name + "/sepolicy.rule";
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if (access(rule.data(), R_OK) == 0) {
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LOGD("Loading custom sepolicy patch: [%s]\n", rule.data());
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sepol->load_rule_file(rule.data());
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}
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}
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}
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}
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LOGD("Dumping sepolicy to: [%s]\n", file);
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sepol->to_file(file);
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delete sepol;
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// Remove OnePlus stupid debug sepolicy and use our own
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if (access("/sepolicy_debug", F_OK) == 0) {
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unlink("/sepolicy_debug");
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link("/sepolicy", "/sepolicy_debug");
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}
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return patch_init;
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}
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static void recreate_sbin(const char *mirror, bool use_bind_mount) {
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auto dp = xopen_dir(mirror);
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int src = dirfd(dp.get());
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char buf[4096];
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for (dirent *entry; (entry = xreaddir(dp.get()));) {
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string sbin_path = "/sbin/"s + entry->d_name;
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struct stat st;
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fstatat(src, entry->d_name, &st, AT_SYMLINK_NOFOLLOW);
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if (S_ISLNK(st.st_mode)) {
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xreadlinkat(src, entry->d_name, buf, sizeof(buf));
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xsymlink(buf, sbin_path.data());
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} else {
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sprintf(buf, "%s/%s", mirror, entry->d_name);
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if (use_bind_mount) {
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auto mode = st.st_mode & 0777;
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// Create dummy
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if (S_ISDIR(st.st_mode))
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xmkdir(sbin_path.data(), mode);
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else
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close(xopen(sbin_path.data(), O_CREAT | O_WRONLY | O_CLOEXEC, mode));
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xmount(buf, sbin_path.data(), nullptr, MS_BIND, nullptr);
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} else {
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xsymlink(buf, sbin_path.data());
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}
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}
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}
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}
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static string magic_mount_list;
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static void magic_mount(const string &sdir, const string &ddir = "") {
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auto dir = xopen_dir(sdir.data());
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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string src = sdir + "/" + entry->d_name;
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string dest = ddir + "/" + entry->d_name;
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if (access(dest.data(), F_OK) == 0) {
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if (entry->d_type == DT_DIR) {
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// Recursive
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magic_mount(src, dest);
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} else {
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LOGD("Mount [%s] -> [%s]\n", src.data(), dest.data());
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xmount(src.data(), dest.data(), nullptr, MS_BIND, nullptr);
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magic_mount_list += dest;
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magic_mount_list += '\n';
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}
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}
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}
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}
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#define ROOTMIR MIRRDIR "/system_root"
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#define MONOPOLICY "/sepolicy"
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#define LIBSELINUX "/system/" LIBNAME "/libselinux.so"
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#define NEW_INITRC "/system/etc/init/hw/init.rc"
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void SARBase::patch_rootdir() {
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string tmp_dir;
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const char *sepol;
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if (access("/sbin", F_OK) == 0) {
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tmp_dir = "/sbin";
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sepol = "/sbin/.se";
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} else {
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char buf[8];
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gen_rand_str(buf, sizeof(buf));
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tmp_dir = "/dev/"s + buf;
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xmkdir(tmp_dir.data(), 0);
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sepol = "/dev/.se";
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}
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setup_tmp(tmp_dir.data());
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chdir(tmp_dir.data());
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mount_rules_dir(BLOCKDIR, MIRRDIR);
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// Mount system_root mirror
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xmkdir(ROOTMIR, 0755);
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xmount("/", ROOTMIR, nullptr, MS_BIND, nullptr);
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mount_list.emplace_back(tmp_dir + "/" ROOTMIR);
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// Recreate original sbin structure if necessary
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if (tmp_dir == "/sbin")
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recreate_sbin(ROOTMIR "/sbin", true);
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// Patch init
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int patch_count;
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{
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int src = xopen("/init", O_RDONLY | O_CLOEXEC);
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auto init = raw_data::read(src);
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patch_count = init.patch({
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make_pair(SPLIT_PLAT_CIL, "xxx"), /* Force loading monolithic sepolicy */
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make_pair(MONOPOLICY, sepol) /* Redirect /sepolicy to custom path */
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});
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xmkdir(ROOTOVL, 0);
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int dest = xopen(ROOTOVL "/init", O_CREAT | O_WRONLY | O_CLOEXEC, 0);
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xwrite(dest, init.buf, init.sz);
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fclone_attr(src, dest);
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close(src);
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close(dest);
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}
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if (patch_count != 2 && access(LIBSELINUX, F_OK) == 0) {
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// init is dynamically linked, need to patch libselinux
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auto lib = raw_data::read(LIBSELINUX);
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lib.patch({make_pair(MONOPOLICY, sepol)});
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xmkdirs(dirname(ROOTOVL LIBSELINUX), 0755);
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int dest = xopen(ROOTOVL LIBSELINUX, O_CREAT | O_WRONLY | O_CLOEXEC, 0);
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xwrite(dest, lib.buf, lib.sz);
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close(dest);
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clone_attr(LIBSELINUX, ROOTOVL LIBSELINUX);
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}
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// sepolicy
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patch_sepolicy(sepol);
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// Restore backup files
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struct sockaddr_un sun;
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int sockfd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
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if (connect(sockfd, (struct sockaddr*) &sun, setup_sockaddr(&sun, INIT_SOCKET)) == 0) {
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LOGD("ACK init daemon to write backup files\n");
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// Let daemon know where tmp_dir is
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write_string(sockfd, tmp_dir.data());
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// Wait for daemon to finish restoring files
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int ack;
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read(sockfd, &ack, sizeof(ack));
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} else {
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LOGD("Restore backup files locally\n");
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restore_folder(ROOTOVL, overlays);
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overlays.clear();
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}
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close(sockfd);
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// Handle overlay.d
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load_overlay_rc(ROOTOVL);
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if (access(ROOTOVL "/sbin", F_OK) == 0) {
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// Move files in overlay.d/sbin into tmp_dir
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mv_path(ROOTOVL "/sbin", ".");
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}
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// Patch init.rc
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if (access("/init.rc", F_OK) == 0) {
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patch_init_rc("/init.rc", ROOTOVL "/init.rc", tmp_dir.data());
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} else {
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// Android 11's new init.rc
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xmkdirs(dirname(ROOTOVL NEW_INITRC), 0755);
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patch_init_rc(NEW_INITRC, ROOTOVL NEW_INITRC, tmp_dir.data());
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}
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// Mount rootdir
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magic_mount(ROOTOVL);
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int dest = xopen(ROOTMNT, O_WRONLY | O_CREAT | O_CLOEXEC, 0);
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write(dest, magic_mount_list.data(), magic_mount_list.length());
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close(dest);
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chdir("/");
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}
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#define TMP_MNTDIR "/dev/mnt"
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#define TMP_RULESDIR "/.backup/.sepolicy.rules"
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void RootFSInit::patch_rootfs() {
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// Handle custom sepolicy rules
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xmkdir(TMP_MNTDIR, 0755);
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mount_rules_dir("/dev/block", TMP_MNTDIR);
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// Preserve custom rule path
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if (!custom_rules_dir.empty()) {
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string rules_dir = "./" + custom_rules_dir.substr(sizeof(TMP_MNTDIR));
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xsymlink(rules_dir.data(), TMP_RULESDIR);
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}
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if (patch_sepolicy("/sepolicy")) {
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auto init = raw_data::mmap_rw("/init");
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init.patch({ make_pair(SPLIT_PLAT_CIL, "xxx") });
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}
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// Handle overlays
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if (access("/overlay.d", F_OK) == 0) {
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LOGD("Merge overlay.d\n");
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load_overlay_rc("/overlay.d");
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mv_path("/overlay.d", "/");
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}
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patch_init_rc("/init.rc", "/init.p.rc", "/sbin");
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rename("/init.p.rc", "/init.rc");
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// Create hardlink mirror of /sbin to /root
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mkdir("/root", 0750);
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clone_attr("/sbin", "/root");
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link_path("/sbin", "/root");
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// Dump magiskinit as magisk
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int fd = xopen("/sbin/magisk", O_WRONLY | O_CREAT, 0755);
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write(fd, self.buf, self.sz);
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close(fd);
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}
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void MagiskProxy::start() {
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// Mount rootfs as rw to do post-init rootfs patches
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xmount(nullptr, "/", nullptr, MS_REMOUNT, nullptr);
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// Backup stuffs before removing them
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self = raw_data::read("/sbin/magisk");
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config = raw_data::read("/.backup/.magisk");
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char custom_rules_dir[64];
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custom_rules_dir[0] = '\0';
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xreadlink(TMP_RULESDIR, custom_rules_dir, sizeof(custom_rules_dir));
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unlink("/sbin/magisk");
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rm_rf("/.backup");
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setup_tmp("/sbin");
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// Create symlinks pointing back to /root
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recreate_sbin("/root", false);
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if (custom_rules_dir[0])
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xsymlink(custom_rules_dir, "/sbin/" RULESDIR);
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// Tell magiskd to remount rootfs
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setenv("REMOUNT_ROOT", "1", 1);
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execv("/sbin/magisk", argv);
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}
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