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Dynamic load libselinux

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This commit is contained in:
topjohnwu
2018-09-27 00:09:59 -04:00
parent 971a50d290
commit 1d53335ae5
17 changed files with 169 additions and 147 deletions
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native/jni/utils/file.c
+9 -121
View File
@@ -11,12 +11,9 @@
#include <sys/mman.h>
#include <linux/fs.h>
#ifdef SELINUX
#include <selinux/selinux.h>
#endif
#include "magisk.h"
#include "utils.h"
#include "selinux.h"
char **excl_list = NULL;
@@ -28,16 +25,16 @@ static int is_excl(const char *name) {
return 0;
}
static int fd_getpath(int fd, char *path, size_t size) {
int fd_getpath(int fd, char *path, size_t size) {
snprintf(path, size, "/proc/self/fd/%d", fd);
return xreadlink(path, path, size) == -1;
return xreadlink(path, path, size) == -1;
}
static int fd_getpathat(int dirfd, const char *name, char *path, size_t size) {
if (fd_getpath(dirfd, path, size))
return 1;
snprintf(path, size, "%s/%s", path, name);
return 0;
int fd_getpathat(int dirfd, const char *name, char *path, size_t size) {
if (fd_getpath(dirfd, path, size))
return 1;
snprintf(path, size, "%s/%s", path, name);
return 0;
}
int mkdirs(const char *pathname, mode_t mode) {
@@ -262,15 +259,11 @@ void link_dir(int src, int dest) {
int getattr(const char *path, struct file_attr *a) {
if (xlstat(path, &a->st) == -1)
return -1;
#ifdef SELINUX
char *con = "";
char *con;
if (lgetfilecon(path, &con) == -1)
return -1;
strcpy(a->con, con);
freecon(con);
#else
a->con[0] = '\0';
#endif
return 0;
}
@@ -281,16 +274,9 @@ int getattrat(int dirfd, const char *pathname, struct file_attr *a) {
}
int fgetattr(int fd, struct file_attr *a) {
#ifdef SELINUX
char path[PATH_MAX];
fd_getpath(fd, path, sizeof(path));
return getattr(path, a);
#else
if (fstat(fd, &a->st) == -1)
return -1;
a->con[0] = '\0';
return 0;
#endif
}
int setattr(const char *path, struct file_attr *a) {
@@ -298,10 +284,8 @@ int setattr(const char *path, struct file_attr *a) {
return -1;
if (chown(path, a->st.st_uid, a->st.st_gid) < 0)
return -1;
#ifdef SELINUX
if (strlen(a->con) && lsetfilecon(path, a->con) < 0)
return -1;
#endif
return 0;
}
@@ -312,17 +296,9 @@ int setattrat(int dirfd, const char *pathname, struct file_attr *a) {
}
int fsetattr(int fd, struct file_attr *a) {
#ifdef SELINUX
char path[PATH_MAX];
fd_getpath(fd, path, sizeof(path));
return setattr(path, a);
#else
if (fchmod(fd, a->st.st_mode & 0777) < 0)
return -1;
if (fchown(fd, a->st.st_uid, a->st.st_gid) < 0)
return -1;
return 0;
#endif
}
void clone_attr(const char *source, const char *target) {
@@ -337,94 +313,6 @@ void fclone_attr(const int sourcefd, const int targetfd) {
fsetattr(targetfd, &a);
}
#ifdef SELINUX
#include "magiskpolicy.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"
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);
}
#endif // SELINUX
static void _mmap(int rw, const char *filename, void **buf, size_t *size) {
struct stat st;
int fd = xopen(filename, (rw ? O_RDWR : O_RDONLY) | O_CLOEXEC);
native/jni/utils/selinux.c
+125
View File
@@ -0,0 +1,125 @@
#include <dlfcn.h>
#include <unistd.h>
#include "magisk.h"
#include "utils.h"
#include "logging.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 char *empty_str = "";
static void v_s(char *s) {}
static int i_s(const char *s) { return 0; }
static int i_ss(const char *s, const char * ss) { return 0; }
static int i_ssp(const char *s, char ** sp) {
*sp = empty_str;
return 0;
}
// Function pointers
void (*freecon)(char * con) = v_s;
int (*setcon)(const char * con) = i_s;
int (*getfilecon)(const char *path, char ** con) = i_ssp;
int (*lgetfilecon)(const char *path, char ** con) = i_ssp;
int (*setfilecon)(const char *path, const char * con) = i_ss;
int (*lsetfilecon)(const char *path, const char * con) = i_ss;
void setup_selinux() {
void *handle = dlopen("libselinux.so", RTLD_LAZY);
if (handle == NULL)
return;
freecon = dlsym(handle, "freecon");
setcon = dlsym(handle, "setcon");
getfilecon = dlsym(handle, "getfilecon");
lgetfilecon = dlsym(handle, "lgetfilecon");
setfilecon = dlsym(handle, "setfilecon");
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);
}