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/*
* Copyright (c) 2013 Red Hat, Inc.
* Author: Tomas Mraz <tmraz@redhat.com>
*
* 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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <security/_pam_types.h>
#include <security/_pam_macros.h>
#include <security/pam_modutil.h>
#include "opasswd.h"
#include "pam_inline.h"
static int
check_history(const char *user, const char *debug)
{
char pass[PAM_MAX_RESP_SIZE + 1];
char *passwords[] = { pass };
int npass;
int dbg = atoi(debug); /* no need to be too fancy here */
int retval;
/* read the password from stdin (a pipe from the pam_pwhistory module) */
npass = pam_read_passwords(STDIN_FILENO, 1, passwords);
if (npass != 1)
{ /* is it a valid password? */
helper_log_err(LOG_DEBUG, "no password supplied");
return PAM_AUTHTOK_ERR;
}
retval = check_old_pass(user, pass, dbg);
memset(pass, '\0', PAM_MAX_RESP_SIZE); /* clear memory of the password */
return retval;
}
static int
save_history(const char *user, const char *howmany, const char *debug)
{
int num = atoi(howmany);
int dbg = atoi(debug); /* no need to be too fancy here */
int retval;
retval = save_old_pass(user, num, dbg);
return retval;
}
int
main(int argc, char *argv[])
{
const char *option;
const char *user;
/*
* we establish that this program is running with non-tty stdin.
* this is to discourage casual use.
*/
if (isatty(STDIN_FILENO) || argc < 4)
{
fprintf(stderr,
"This binary is not designed for running in this way.\n");
return PAM_SYSTEM_ERR;
}
option = argv[1];
user = argv[2];
if (strcmp(option, "check") == 0 && argc == 4)
return check_history(user, argv[3]);
else if (strcmp(option, "save") == 0 && argc == 5)
return save_history(user, argv[3], argv[4]);
fprintf(stderr, "This binary is not designed for running in this way.\n");
return PAM_SYSTEM_ERR;
}
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