mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-28 12:35:26 +00:00
123 lines
3.1 KiB
C++
123 lines
3.1 KiB
C++
#include <dlfcn.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
|
|
#include "magisk.h"
|
|
#include "utils.h"
|
|
#include "selinux.h"
|
|
|
|
#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 MAGISK_CON "u:object_r:" SEPOL_FILE_DOMAIN ":s0"
|
|
|
|
// Stub implementations
|
|
|
|
static void v_s(char *s) { delete[] s; }
|
|
|
|
static int i_s(const char *) { return 0; }
|
|
|
|
static int i_ss(const char *, const char *) { return 0; }
|
|
|
|
static int i_ssp(const char *, char ** sp) {
|
|
*sp = new char[1]();
|
|
return 0;
|
|
}
|
|
|
|
// Function pointers
|
|
|
|
void (*freecon)(char *) = v_s;
|
|
int (*setcon)(const char *) = i_s;
|
|
int (*getfilecon)(const char *, char **) = i_ssp;
|
|
int (*lgetfilecon)(const char *, char **) = i_ssp;
|
|
int (*setfilecon)(const char *, const char *) = i_ss;
|
|
int (*lsetfilecon)(const char *, const char *) = i_ss;
|
|
|
|
void dload_selinux() {
|
|
void *handle = dlopen("libselinux.so", RTLD_LAZY);
|
|
if (handle == nullptr)
|
|
return;
|
|
*(void **) &freecon = dlsym(handle, "freecon");
|
|
*(void **) &setcon = dlsym(handle, "setcon");
|
|
*(void **) &getfilecon = dlsym(handle, "getfilecon");
|
|
*(void **) &lgetfilecon = dlsym(handle, "lgetfilecon");
|
|
*(void **) &setfilecon = dlsym(handle, "setfilecon");
|
|
*(void **) &lsetfilecon = dlsym(handle, "lsetfilecon");
|
|
}
|
|
|
|
static void restore_syscon(int dirfd) {
|
|
struct dirent *entry;
|
|
DIR *dir;
|
|
|
|
char path[PATH_MAX], *con;
|
|
|
|
fd_getpath(dirfd, path, sizeof(path));
|
|
size_t len = strlen(path);
|
|
getfilecon(path, &con);
|
|
if (strlen(con) == 0 || strcmp(con, UNLABEL_CON) == 0)
|
|
lsetfilecon(path, SYSTEM_CON);
|
|
freecon(con);
|
|
|
|
dir = xfdopendir(dirfd);
|
|
while ((entry = xreaddir(dir))) {
|
|
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
|
|
continue;
|
|
if (entry->d_type == DT_DIR) {
|
|
int fd = xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC);
|
|
restore_syscon(fd);
|
|
close(fd);
|
|
} else {
|
|
path[len] = '/';
|
|
strcpy(path + len + 1, entry->d_name);
|
|
lgetfilecon(path, &con);
|
|
if (strlen(con) == 0 || strcmp(con, UNLABEL_CON) == 0)
|
|
lsetfilecon(path, SYSTEM_CON);
|
|
freecon(con);
|
|
path[len] = '\0';
|
|
}
|
|
}
|
|
}
|
|
|
|
static void restore_magiskcon(int dirfd) {
|
|
struct dirent *entry;
|
|
DIR *dir;
|
|
|
|
char path[PATH_MAX];
|
|
|
|
fd_getpath(dirfd, path, sizeof(path));
|
|
size_t len = strlen(path);
|
|
lsetfilecon(path, MAGISK_CON);
|
|
lchown(path, 0, 0);
|
|
|
|
dir = xfdopendir(dirfd);
|
|
while ((entry = xreaddir(dir))) {
|
|
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
|
|
continue;
|
|
if (entry->d_type == DT_DIR) {
|
|
int fd = xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC);
|
|
restore_magiskcon(fd);
|
|
close(fd);
|
|
} else {
|
|
path[len] = '/';
|
|
strcpy(path + len + 1, entry->d_name);
|
|
lsetfilecon(path, MAGISK_CON);
|
|
lchown(path, 0, 0);
|
|
path[len] = '\0';
|
|
}
|
|
}
|
|
}
|
|
|
|
void restorecon() {
|
|
int fd;
|
|
fd = xopen(SELINUX_CONTEXT, O_WRONLY | O_CLOEXEC);
|
|
if (write(fd, ADB_CON, sizeof(ADB_CON)) >= 0)
|
|
lsetfilecon(SECURE_DIR, ADB_CON);
|
|
close(fd);
|
|
fd = xopen(MOUNTPOINT, O_RDONLY | O_CLOEXEC);
|
|
restore_syscon(fd);
|
|
close(fd);
|
|
fd = xopen(DATABIN, O_RDONLY | O_CLOEXEC);
|
|
restore_magiskcon(fd);
|
|
close(fd);
|
|
}
|