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Administrator
Magisk
Commits
ebd509d9
Commit
ebd509d9
authored
Feb 10, 2018
by
topjohnwu
Browse files
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Obfuscate socket name to prevent detection
Because why not
parent
7193374a
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Inline
Side-by-side
Showing
5 changed files
with
148 additions
and
102 deletions
+148
-102
magiskinit.c
native/jni/core/magiskinit.c
+26
-1
socket.c
native/jni/core/socket.c
+101
-100
magisk.h
native/jni/include/magisk.h
+1
-1
utils.h
native/jni/include/utils.h
+1
-0
misc.c
native/jni/utils/misc.c
+19
-0
No files found.
native/jni/core/magiskinit.c
View file @
ebd509d9
...
@@ -56,6 +56,8 @@
...
@@ -56,6 +56,8 @@
extern
policydb_t
*
policydb
;
extern
policydb_t
*
policydb
;
int
(
*
init_applet_main
[])
(
int
,
char
*
[])
=
{
magiskpolicy_main
,
magiskpolicy_main
,
NULL
};
int
(
*
init_applet_main
[])
(
int
,
char
*
[])
=
{
magiskpolicy_main
,
magiskpolicy_main
,
NULL
};
static
int
keepverity
=
0
,
keepencrypt
=
0
;
static
int
keepverity
=
0
,
keepencrypt
=
0
;
static
char
RAND_SOCKET_NAME
[
sizeof
(
SOCKET_NAME
)];
static
int
SOCKET_OFF
=
-
1
;
struct
cmdline
{
struct
cmdline
{
int
skip_initramfs
;
int
skip_initramfs
;
...
@@ -367,6 +369,23 @@ static int dump_magiskrc(const char *path, mode_t mode) {
...
@@ -367,6 +369,23 @@ static int dump_magiskrc(const char *path, mode_t mode) {
return
0
;
return
0
;
}
}
static
void
patch_socket_name
(
const
char
*
path
)
{
void
*
buf
;
size_t
size
;
mmap_rw
(
path
,
&
buf
,
&
size
);
if
(
SOCKET_OFF
<
0
)
{
for
(
int
i
=
0
;
i
<
size
;
++
i
)
{
if
(
memcmp
(
buf
+
i
,
SOCKET_NAME
,
sizeof
(
SOCKET_NAME
))
==
0
)
{
SOCKET_OFF
=
i
;
break
;
}
}
}
gen_rand_str
(
RAND_SOCKET_NAME
,
sizeof
(
SOCKET_NAME
));
memcpy
(
buf
+
SOCKET_OFF
,
RAND_SOCKET_NAME
,
sizeof
(
SOCKET_NAME
));
munmap
(
buf
,
size
);
}
static
void
magisk_init_daemon
()
{
static
void
magisk_init_daemon
()
{
setsid
();
setsid
();
...
@@ -381,6 +400,7 @@ static void magisk_init_daemon() {
...
@@ -381,6 +400,7 @@ static void magisk_init_daemon() {
dup3
(
null
,
STDIN_FILENO
,
O_CLOEXEC
);
dup3
(
null
,
STDIN_FILENO
,
O_CLOEXEC
);
dup3
(
null
,
STDOUT_FILENO
,
O_CLOEXEC
);
dup3
(
null
,
STDOUT_FILENO
,
O_CLOEXEC
);
dup3
(
null
,
STDERR_FILENO
,
O_CLOEXEC
);
dup3
(
null
,
STDERR_FILENO
,
O_CLOEXEC
);
if
(
null
>
STDERR_FILENO
)
close
(
null
);
close
(
null
);
// Transit our context to su (mimic setcon)
// Transit our context to su (mimic setcon)
...
@@ -398,6 +418,7 @@ static void magisk_init_daemon() {
...
@@ -398,6 +418,7 @@ static void magisk_init_daemon() {
while
(
1
)
{
while
(
1
)
{
struct
sockaddr_un
sun
;
struct
sockaddr_un
sun
;
fd
=
setup_socket
(
&
sun
);
fd
=
setup_socket
(
&
sun
);
memcpy
(
sun
.
sun_path
+
1
,
RAND_SOCKET_NAME
,
sizeof
(
SOCKET_NAME
));
while
(
connect
(
fd
,
(
struct
sockaddr
*
)
&
sun
,
sizeof
(
sun
)))
while
(
connect
(
fd
,
(
struct
sockaddr
*
)
&
sun
,
sizeof
(
sun
)))
usleep
(
10000
);
/* Wait 10 ms after each try */
usleep
(
10000
);
/* Wait 10 ms after each try */
...
@@ -446,6 +467,7 @@ int main(int argc, char *argv[]) {
...
@@ -446,6 +467,7 @@ int main(int argc, char *argv[]) {
dump_magisk
(
"/overlay/sbin/magisk"
,
0755
);
dump_magisk
(
"/overlay/sbin/magisk"
,
0755
);
mkdir
(
"/overlay/root"
,
0755
);
mkdir
(
"/overlay/root"
,
0755
);
link
(
"/init"
,
"/overlay/root/magiskinit"
);
link
(
"/init"
,
"/overlay/root/magiskinit"
);
patch_socket_name
(
"/overlay/sbin/magisk"
);
struct
cmdline
cmd
;
struct
cmdline
cmd
;
parse_cmdline
(
&
cmd
);
parse_cmdline
(
&
cmd
);
...
@@ -535,6 +557,9 @@ int main(int argc, char *argv[]) {
...
@@ -535,6 +557,9 @@ int main(int argc, char *argv[]) {
}
}
close
(
overlay
);
close
(
overlay
);
close
(
STDIN_FILENO
);
close
(
STDOUT_FILENO
);
close
(
STDERR_FILENO
);
if
(
fork_dont_care
()
==
0
)
{
if
(
fork_dont_care
()
==
0
)
{
strcpy
(
argv
[
0
],
"magiskinit"
);
strcpy
(
argv
[
0
],
"magiskinit"
);
...
...
native/jni/core/socket.c
View file @
ebd509d9
...
@@ -13,7 +13,8 @@ int setup_socket(struct sockaddr_un *sun) {
...
@@ -13,7 +13,8 @@ int setup_socket(struct sockaddr_un *sun) {
int
fd
=
xsocket
(
AF_LOCAL
,
SOCK_STREAM
|
SOCK_CLOEXEC
,
0
);
int
fd
=
xsocket
(
AF_LOCAL
,
SOCK_STREAM
|
SOCK_CLOEXEC
,
0
);
memset
(
sun
,
0
,
sizeof
(
*
sun
));
memset
(
sun
,
0
,
sizeof
(
*
sun
));
sun
->
sun_family
=
AF_LOCAL
;
sun
->
sun_family
=
AF_LOCAL
;
memcpy
(
sun
->
sun_path
,
REQUESTOR_DAEMON_PATH
,
sizeof
(
REQUESTOR_DAEMON_PATH
)
-
1
);
sun
->
sun_path
[
0
]
=
'\0'
;
memcpy
(
sun
->
sun_path
+
1
,
SOCKET_NAME
,
sizeof
(
SOCKET_NAME
));
return
fd
;
return
fd
;
}
}
...
...
native/jni/include/magisk.h
View file @
ebd509d9
...
@@ -7,7 +7,7 @@
...
@@ -7,7 +7,7 @@
#include "logging.h"
#include "logging.h"
#define MAGISK_VER_STR xstr(MAGISK_VERSION) ":MAGISK"
#define MAGISK_VER_STR xstr(MAGISK_VERSION) ":MAGISK"
#define
REQUESTOR_DAEMON_PATH "\0MAGISK
"
#define
SOCKET_NAME "d30138f2310a9fb9c54a3e0c21f58591
"
#ifndef ARG_MAX
#ifndef ARG_MAX
#define ARG_MAX 4096
#define ARG_MAX 4096
...
...
native/jni/include/utils.h
View file @
ebd509d9
...
@@ -90,6 +90,7 @@ void get_client_cred(int fd, struct ucred *cred);
...
@@ -90,6 +90,7 @@ void get_client_cred(int fd, struct ucred *cred);
int
switch_mnt_ns
(
int
pid
);
int
switch_mnt_ns
(
int
pid
);
int
fork_dont_care
();
int
fork_dont_care
();
void
wait_till_exists
(
const
char
*
target
);
void
wait_till_exists
(
const
char
*
target
);
void
gen_rand_str
(
char
*
buf
,
int
len
);
// file.c
// file.c
...
...
native/jni/utils/misc.c
View file @
ebd509d9
...
@@ -17,6 +17,7 @@
...
@@ -17,6 +17,7 @@
#include <sys/wait.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/inotify.h>
#include <sys/inotify.h>
#include <sys/sysmacros.h>
#include "logging.h"
#include "logging.h"
#include "utils.h"
#include "utils.h"
...
@@ -341,3 +342,21 @@ void wait_till_exists(const char *target) {
...
@@ -341,3 +342,21 @@ void wait_till_exists(const char *target) {
}
}
close
(
fd
);
close
(
fd
);
}
}
void
gen_rand_str
(
char
*
buf
,
int
len
)
{
const
char
base
[]
=
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_."
;
int
urandom
;
if
(
access
(
"/dev/urandom"
,
R_OK
)
==
0
)
{
urandom
=
xopen
(
"/dev/urandom"
,
O_RDONLY
|
O_CLOEXEC
);
}
else
{
mknod
(
"/urandom"
,
S_IFCHR
|
0666
,
makedev
(
1
,
9
));
urandom
=
xopen
(
"/urandom"
,
O_RDONLY
|
O_CLOEXEC
);
unlink
(
"/urandom"
);
}
xxread
(
urandom
,
buf
,
len
-
1
);
close
(
urandom
);
for
(
int
i
=
0
;
i
<
len
-
1
;
++
i
)
{
buf
[
i
]
=
base
[
buf
[
i
]
%
(
sizeof
(
base
)
-
1
)];
}
buf
[
len
-
1
]
=
'\0'
;
}
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