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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (c) 2007 William Jon McCann <mccann@jhu.edu>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <security/pam_appl.h>
#include <security/pam_misc.h>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif /* HAVE_PATHS_H */
#define PAM_MAX_LOGIN_TRIES 3
#define PAM_FAIL_CHECK if (retcode != PAM_SUCCESS) { \
fprintf (stderr, "\n%s\n", pam_strerror (pamh, retcode)); \
pam_end (pamh, retcode); exit (1); \
}
#define PAM_END { \
pam_setcred (pamh, PAM_DELETE_CRED); \
retcode = pam_close_session (pamh, 0); \
pam_end (pamh, retcode); \
}
int
main (int argc, char *argv[])
{
int retcode;
int ret;
pam_handle_t *pamh;
char *username;
char *hostname;
char *tty_name;
char *ttyn;
struct pam_conv conv = { misc_conv, NULL };
int failcount;
ret = 1;
username = NULL;
hostname = NULL;
tty_name = NULL;
retcode = pam_start ("login", username, &conv, &pamh);
if (retcode != PAM_SUCCESS) {
fprintf (stderr, "login: PAM Failure, aborting: %s\n",
pam_strerror (pamh, retcode));
exit (99);
}
ttyn = ttyname (0);
if (strncmp (ttyn, _PATH_DEV, 5) == 0) {
tty_name = ttyn + 5;
} else {
tty_name = ttyn;
}
retcode = pam_set_item (pamh, PAM_RHOST, hostname);
PAM_FAIL_CHECK;
retcode = pam_set_item (pamh, PAM_TTY, tty_name);
PAM_FAIL_CHECK;
pam_set_item (pamh, PAM_USER, NULL);
retcode = pam_set_item (pamh, PAM_USER_PROMPT, "Username: ");
PAM_FAIL_CHECK;
failcount = 0;
retcode = pam_authenticate (pamh, 0);
while ((failcount++ < PAM_MAX_LOGIN_TRIES) &&
((retcode == PAM_AUTH_ERR) ||
(retcode == PAM_USER_UNKNOWN) ||
(retcode == PAM_CRED_INSUFFICIENT) ||
(retcode == PAM_AUTHINFO_UNAVAIL))) {
pam_get_item (pamh, PAM_USER, (const void **) &username);
fprintf (stderr, "Login incorrect\n\n");
pam_set_item (pamh, PAM_USER, NULL);
retcode = pam_authenticate (pamh, 0);
}
if (retcode != PAM_SUCCESS) {
fprintf (stderr, "\nLogin incorrect\n");
pam_end (pamh, retcode);
exit (0);
}
retcode = pam_acct_mgmt (pamh, 0);
if (retcode == PAM_NEW_AUTHTOK_REQD) {
retcode = pam_chauthtok (pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
}
PAM_FAIL_CHECK;
pam_putenv (pamh, "CKCON_TTY=/dev/tty55");
pam_putenv (pamh, "CKCON_X11_DISPLAY=:50");
retcode = pam_open_session (pamh, 0);
PAM_FAIL_CHECK;
retcode = pam_setcred (pamh, PAM_ESTABLISH_CRED);
PAM_FAIL_CHECK;
pam_get_item (pamh, PAM_USER, (const void **) &username);
printf ("Session opened for %s\n", username);
printf ("sleeping for 20 seconds...");
sleep (20);
PAM_END;
printf ("\nSession closed\n");
return ret;
}
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