Subject: Re: special bbs user's login shell
Date: Wed, 30 May 2001 14:55:43 -0400 (EDT)
From: Jose Nazario <jose@cwru.edu>
To: Walter de Jong <walter@heiho.net>

and here is the shel program. stupidly simple, but it works. here is an
openbsd /etc/passwd entry for this user:

bbs-user:*:1004:1004:bbs100 user:/home/bbs-user:/usr/local/bin/bbsshell

this user has no password, by the way, and no rights: they can't do much
of anything on the system. a firewall keeps external connections from
getting to port 1234/tcp.

#include<sys/types.h>
#include<sys/wait.h>
#include<stdio.h>

char           *args[5];

int
main()
{
  args[0] = "telnet";
  args[1] = "-Ec";
  args[2] = "127.0.0.1";
  args[3] = "1234";
  args[4] = NULL;
  if (execv("/usr/bin/telnet", args) < 0) {
    fprintf(stderr, "logging in failed.\n");
    exit(-1);
  }
  return (0);
}


enjoy, and i hope you find this useful. and thanks for bbs-100. an openbsd
port is set soon. our isp folded (northpoint) and so the bbs was on a
useless link for two months. we're finaly back on our feet.

____________________________
jose nazario                                                 jose@cwru.edu
                     PGP: 89 B0 81 DA 5B FD 7E 00  99 C3 B2 CD 48 A0 07 80
                                       PGP key ID 0xFD37F4E5 (pgp.mit.edu)