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/* $Id: auth_helper_common.c,v 1.3 2004/06/12 07:52:01 dm Exp $ */
/*
*
* Copyright (C) 2004 David Mazieres (dm@uun.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#include "sfs-internal.h"
#include "auth_helper.h"
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
static int use_rpc; /* For debugging */
char *progname;
char *service;
char *user;
#define PW_BUF_SIZE 256
static char *
authhelp_input_tty (char *prompt, int echo)
{
printf ("%s", prompt);
fflush (stdout);
if (!echo)
return strdup (getpass (""));
else {
char *buf = malloc (PW_BUF_SIZE);
int n = read (0, buf, PW_BUF_SIZE);
if (n <= 0) {
fprintf (stderr, "%s(%s,%s): EOF\n", progname,
user ? user : "unknown user", service);
exit (1);
}
if (n >= PW_BUF_SIZE) {
fprintf (stderr, "%s(%s,%s): input too long\n",
progname, user ? user : "unknown user", service);
exit (1);
}
buf[n] = '\0';
while (n > 0 && (buf[n-1] == '\r' || buf[n-1] == '\n'))
buf[--n] = '\0';
return buf;
}
}
static void
authhelp_approve_tty (char *u, char *hello)
{
if (hello)
fprintf (stderr,"%s\n", hello);
fprintf (stderr, "%s(%s,%s): authenticated %s\n",
progname, user, service, u);
}
static char *
authhelp_input_rpc (char *prompt, int echo)
{
authhelp_getpass_arg arg;
authhelp_getpass_res res;
enum clnt_stat err;
bzero (&arg, sizeof (arg));
bzero (&res, sizeof (res));
arg.prompt = prompt;
arg.echo = echo;
err = srpc_call (&authhelp_prog_1, 0, AUTHHELPPROG_GETPASS, &arg, &res);
if (err) {
fprintf (stderr, "%s(%s,%s): %s\n",
progname, user ? user : "unknown user",
service, clnt_sperrno (err));
exit (1);
}
return res.response;
}
static void
authhelp_approve_rpc (char *u, char *hello)
{
authhelp_succeed_arg arg;
bzero (&arg, sizeof (arg));
arg.user = u;
arg.hello = hello ? hello : "";
srpc_call (&authhelp_prog_1, 0, AUTHHELPPROG_SUCCEED, &arg, NULL);
}
char *
authhelp_input (char *prompt, int echo)
{
if (use_rpc)
return authhelp_input_rpc (prompt, echo);
else
return authhelp_input_tty (prompt, echo);
}
void
authhelp_approve (char *user, char *hello)
{
if (use_rpc)
authhelp_approve_rpc (user, hello);
else
authhelp_approve_tty (user, hello);
}
static void usage (void) __attribute__ ((noreturn));
static void
usage (void)
{
fprintf (stderr, "usage: %s [-r] <service> [<user>]\n", progname);
exit (1);
}
int
main (int argc, char **argv)
{
if ((progname = strrchr (argv[0], '/')))
progname++;
else
progname = argv[0];
/* N.B.: We explicitly do not want to use getopt here, because
* Linux getopt sometimes does some very weird and un-posix things,
* which could cause late arguments (after the service) to be
* interpreted as command line arguments. We definitely want to
* avoid any kind of "login -froot" type bugs here.
*/
optind = 1;
if (optind < argc && !strcmp (argv[optind], "--"))
optind++;
else if (optind < argc && !strcmp (argv[optind], "-r")) {
use_rpc = 1;
optind++;
}
else if (optind < argc && argv[optind][0] == '-')
usage ();
if (optind + 2 == argc)
user = argv[optind+1];
else if (optind + 1 != argc)
usage ();
service = argv[optind];
if (!user)
user = authhelp_input ("Username: ", 1);
exit (authhelp_go () != 0);
}
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