/*
* Copyright Elliot Lee, 1996. All rights reserved.
* Copyright Jan R�korajski, 1999. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <security/_pam_aconf.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <syslog.h>
#include <pwd.h>
#include <shadow.h>
#include <time.h> /* for time() */
#include <security/_pam_macros.h>
/* indicate that the following groups are defined */
#define PAM_SM_ACCOUNT
#include <security/pam_modules.h>
#ifndef LINUX_PAM
#include <security/pam_appl.h>
#endif /* LINUX_PAM */
#include "support.h"
/*
* PAM framework looks for this entry-point to pass control to the
* account management module.
*/
PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t * pamh, int flags,
int argc, const char **argv)
{
unsigned int ctrl;
const char *uname;
int retval, daysleft;
time_t curdays;
struct spwd *spent;
struct passwd *pwent;
char buf[80];
D(("called."));
ctrl = _set_ctrl(pamh, flags, NULL, argc, argv);
retval = pam_get_item(pamh, PAM_USER, (const void **) &uname);
D(("user = `%s'", uname));
if (retval != PAM_SUCCESS || uname == NULL) {
_log_err(LOG_ALERT, pamh
,"could not identify user (from uid=%d)"
,getuid());
return PAM_USER_UNKNOWN;
}
pwent = getpwnam(uname);
if (!pwent) {
_log_err(LOG_ALERT, pamh
,"could not identify user (from getpwnam(%s))"
,uname);
return PAM_USER_UNKNOWN;
}
if (!strcmp( pwent->pw_passwd, "*NP*" )) { /* NIS+ */
uid_t save_euid, save_uid;
save_euid = geteuid();
save_uid = getuid();
if (save_uid == pwent->pw_uid)
setreuid( save_euid, save_uid );
else {
setreuid( 0, -1 );
if (setreuid( -1, pwent->pw_uid ) == -1) {
setreuid( -1, 0 );
setreuid( 0, -1 );
if(setreuid( -1, pwent->pw_uid ) == -1)
return PAM_CRED_INSUFFICIENT;
}
}
spent = getspnam( uname );
if (save_uid == pwent->pw_uid)
setreuid( save_uid, save_euid );
else {
if (setreuid( -1, 0 ) == -1)
setreuid( save_uid, -1 );
setreuid( -1, save_euid );
}
} else if (!strcmp( pwent->pw_passwd, "x" )) {
spent = getspnam(uname);
} else {
return PAM_SUCCESS;
}
if (!spent)
return PAM_AUTHINFO_UNAVAIL; /* Couldn't get username from shadow */
curdays = time(NULL) / (60 * 60 * 24);
D(("today is %d, last change %d", curdays, spent->sp_lstchg));
if ((curdays > spent->sp_expire) && (spent->sp_expire != -1)
&& (spent->sp_lstchg != 0)) {
_log_err(LOG_NOTICE, pamh
,"account %s has expired (account expired)"
,uname);
_make_remark(pamh, ctrl, PAM_ERROR_MSG,
"Your account has expired; please contact your system administrator");
D(("account expired"));
return PAM_ACCT_EXPIRED;
}
if ((curdays > (spent->sp_lstchg + spent->sp_max + spent->sp_inact))
&& (spent->sp_max != -1) && (spent->sp_inact != -1)
&& (spent->sp_lstchg != 0)) {
_log_err(LOG_NOTICE, pamh
,"account %s has expired (failed to change password)"
,uname);
_make_remark(pamh, ctrl, PAM_ERROR_MSG,
"Your account has expired; please contact your system administrator");
D(("account expired 2"));
return PAM_ACCT_EXPIRED;
}
D(("when was the last change"));
if (spent->sp_lstchg == 0) {
_log_err(LOG_NOTICE, pamh
,"expired password for user %s (root enforced)"
,uname);
_make_remark(pamh, ctrl, PAM_ERROR_MSG,
"You are required to change your password immediately (root enforced)");
D(("need a new password"));
return PAM_NEW_AUTHTOK_REQD;
}
if (((spent->sp_lstchg + spent->sp_max) < curdays) && (spent->sp_max != -1)) {
_log_err(LOG_DEBUG, pamh
,"expired password for user %s (password aged)"
,uname);
_make_remark(pamh, ctrl, PAM_ERROR_MSG,
"You are required to change your password immediately (password aged)");
D(("need a new password 2"));
return PAM_NEW_AUTHTOK_REQD;
}
if ((curdays > (spent->sp_lstchg + spent->sp_max - spent->sp_warn))
&& (spent->sp_max != -1) && (spent->sp_warn != -1)) {
daysleft = (spent->sp_lstchg + spent->sp_max) - curdays;
_log_err(LOG_DEBUG, pamh
,"password for user %s will expire in %d days"
,uname, daysleft);
snprintf(buf, 80, "Warning: your password will expire in %d day%.2s",
daysleft, daysleft == 1 ? "" : "s");
_make_remark(pamh, ctrl, PAM_TEXT_INFO, buf);
}
D(("all done"));
return PAM_SUCCESS;
}
/* static module data */
#ifdef PAM_STATIC
struct pam_module _pam_unix_acct_modstruct = {
"pam_unix_acct",
NULL,
NULL,
pam_sm_acct_mgmt,
NULL,
NULL,
NULL,
};
#endif