pipe auth doesn't work with new version

[Joe Pruett <joey@q7.com>]

the following lines are missing from authinfo.c:
    43  #ifdef AUTHINFO_PIPE
    44      if (strCaseEq(a, "pipe"))
    45          return &pipe_authenticator;
    46  #endif

and the provided unixauth.c file doesn't do any good with shadow passwords
(which is probably why you're using it).  i've reworked it to support them
as well as provide a timeout for bad passwords to alleviate brute force
attacks.

/* $Id: unixauth.c,v 1.1 1999/12/18 20:19:17 proff Exp $
 * $Copyright$
 */

/*
 * simple setuid program to test a password; run as "unixauth user"
 * and pass write the argument as input.  it will exit(0) for a
 * valid user and exit(1) else for invalid.  run this to test a
 * authentication when passwords are secret in /etc/shadow, 
 * /etc/master.passwd, etc.
 */
#include <sys/types.h>
#include <shadow.h>
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#  include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#  include <unistd.h>
#endif

int main (int argc, char **argv, char **envp)
{
	char pass[256];
	struct spwd *spw;

	if ((argc == 2)
	&& (fgets(pass, sizeof pass, stdin) != NULL)
	&& pass[0]
	&& ((spw = getspnam(argv[1])) != NULL)
	&& (strcmp(crypt(pass, spw->sp_pwdp), spw->sp_pwdp) == 0)) {
		exit(0);
	}
	sleep(5);
	exit(1);
}