374 lines
9.6 KiB
C++
374 lines
9.6 KiB
C++
#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <vector>
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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<raw_data> 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 &d : rc_list)
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fprintf(rc, "\n%s\n", d.buf);
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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, magiskrc, 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 = readdir(dir.get()));) {
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if (strend(entry->d_name, ".rc") == 0) {
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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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raw_data data;
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fd_full_read(rc, data.buf, data.sz);
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close(rc);
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rc_list.push_back(std::move(data));
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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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void RootFSInit::setup_rootfs() {
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if (patch_sepolicy("/sepolicy")) {
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char *addr;
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size_t size;
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mmap_rw("/init", addr, size);
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for (char *p = addr; p < addr + size; ++p) {
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if (memcmp(p, SPLIT_PLAT_CIL, sizeof(SPLIT_PLAT_CIL)) == 0) {
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// Force init to load /sepolicy
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LOGD("Remove from init: " SPLIT_PLAT_CIL "\n");
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memset(p, 'x', sizeof(SPLIT_PLAT_CIL) - 1);
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break;
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}
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}
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munmap(addr, size);
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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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bool MagiskInit::patch_sepolicy(const char *file) {
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bool patch_init = false;
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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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load_policydb("/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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load_split_cil();
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sepol_magisk_rules();
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sepol_allow(SEPOL_PROC_DOMAIN, ALL, ALL, ALL);
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// Custom rules
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if (auto dir = xopen_dir(persist_dir.data()); dir) {
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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auto rule = persist_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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load_rule_file(rule.data());
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}
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}
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}
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dump_policydb(file);
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destroy_policydb();
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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 ROOTBLK BLOCKDIR "/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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char tmp_dir[16];
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const char *sepol;
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char *p;
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if (access("/sbin", F_OK) == 0) {
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p = tmp_dir + sprintf(tmp_dir, "%s", "/sbin");
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sepol = "/sbin/.se";
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} else {
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p = tmp_dir + sprintf(tmp_dir, "%s", "/dev/");
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p += gen_rand_str(p, 8);
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xmkdir(tmp_dir, 0);
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sepol = "/dev/.se";
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}
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setup_tmp(tmp_dir, self, config);
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persist_dir = string(tmp_dir) + "/" MIRRDIR "/persist";
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chdir(tmp_dir);
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// Mount system_root mirror
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struct stat st;
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xstat("/", &st);
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xmkdir(ROOTMIR, 0755);
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mknod(ROOTBLK, S_IFBLK | 0600, st.st_dev);
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strcpy(p, "/" ROOTBLK);
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if (xmount(tmp_dir, ROOTMIR, "ext4", MS_RDONLY, nullptr))
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xmount(tmp_dir, ROOTMIR, "erofs", MS_RDONLY, nullptr);
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*p = '\0';
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// Recreate original sbin structure if necessary
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if (tmp_dir == "/sbin"sv)
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recreate_sbin(ROOTMIR "/sbin", true);
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// Patch init
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raw_data init;
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bool redirect = false;
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int src = xopen("/init", O_RDONLY | O_CLOEXEC);
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fd_full_read(src, init.buf, init.sz);
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uint8_t *eof = init.buf + init.sz;
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for (uint8_t *p = init.buf; p < eof;) {
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if (memcmp(p, SPLIT_PLAT_CIL, sizeof(SPLIT_PLAT_CIL)) == 0) {
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LOGD("Remove from init: " SPLIT_PLAT_CIL "\n");
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memset(p, 'x', sizeof(SPLIT_PLAT_CIL) - 1);
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p += sizeof(SPLIT_PLAT_CIL);
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} else if (memcmp(p, MONOPOLICY, sizeof(MONOPOLICY)) == 0) {
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LOGD("Patch init [" MONOPOLICY "] -> [%s]\n", sepol);
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strcpy(reinterpret_cast<char *>(p), sepol);
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redirect = true;
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p += sizeof(MONOPOLICY);
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} else {
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++p;
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}
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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);
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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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if (!redirect) {
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// init is dynamically linked, need to patch libselinux
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raw_data lib;
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full_read(LIBSELINUX, lib.buf, lib.sz);
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eof = lib.buf + lib.sz;
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for (uint8_t *p = lib.buf; p < eof; ++p) {
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if (memcmp(p, MONOPOLICY, sizeof(MONOPOLICY)) == 0) {
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LOGD("Patch libselinux.so [" MONOPOLICY "] -> [%s]\n", sepol);
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strcpy(reinterpret_cast<char *>(p), sepol);
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break;
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}
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}
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xmkdirs(dirname(ROOTOVL LIBSELINUX), 0755);
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dest = xopen(ROOTOVL LIBSELINUX, O_CREAT | O_WRONLY | O_CLOEXEC);
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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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// Handle overlay
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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);
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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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if (access(ROOTOVL "/sbin", F_OK) == 0) {
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file_attr a;
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getattr("/sbin", &a);
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cp_afc(ROOTOVL "/sbin", "/sbin");
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rm_rf(ROOTOVL "/sbin");
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setattr("/sbin", &a);
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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);
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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);
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}
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// Mount rootdir
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magic_mount(ROOTOVL);
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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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int magisk_proxy_main(int argc, char *argv[]) {
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setup_klog();
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raw_data config;
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raw_data self;
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full_read("/sbin/magisk", self.buf, self.sz);
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full_read("/.backup/.magisk", config.buf, config.sz);
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xmount(nullptr, "/", nullptr, MS_REMOUNT, nullptr);
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unlink("/sbin/magisk");
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rm_rf("/.backup");
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setup_tmp("/sbin", self, config);
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// Create symlinks pointing back to /root
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recreate_sbin("/root", false);
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setenv("REMOUNT_ROOT", "1", 1);
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execv("/sbin/magisk", argv);
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return 1;
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}
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