121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/*
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* Copyright (c) 2013 Red Hat, Inc.
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* Author: Tomas Mraz <tmraz@redhat.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, and the entire permission notice in its entirety,
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* including the disclaimer of warranties.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* ALTERNATIVELY, this product may be distributed under the terms of
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* the GNU Public License, in which case the provisions of the GPL are
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* required INSTEAD OF the above restrictions. (This clause is
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* necessary due to a potential bad interaction between the GPL and
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* the restrictions contained in a BSD-style copyright.)
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <errno.h>
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#include <unistd.h>
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#include <signal.h>
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#include <security/_pam_types.h>
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#include <security/_pam_macros.h>
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#include <security/pam_modutil.h>
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#include "opasswd.h"
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#include "pam_inline.h"
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static int
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check_history(const char *user, const char *filename, const char *debug)
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{
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char pass[PAM_MAX_RESP_SIZE + 1];
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char *passwords[] = { pass };
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int npass;
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int dbg = atoi(debug); /* no need to be too fancy here */
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int retval;
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/* read the password from stdin (a pipe from the pam_pwhistory module) */
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npass = pam_read_passwords(STDIN_FILENO, 1, passwords);
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if (npass != 1)
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{ /* is it a valid password? */
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helper_log_err(LOG_DEBUG, "no password supplied");
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return PAM_AUTHTOK_ERR;
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}
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retval = check_old_pass(user, pass, filename, dbg);
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pam_overwrite_array(pass); /* clear memory of the password */
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return retval;
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}
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static int
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save_history(const char *user, const char *filename, const char *howmany, const char *debug)
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{
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int num = atoi(howmany);
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int dbg = atoi(debug); /* no need to be too fancy here */
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int retval;
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retval = save_old_pass(user, num, filename, dbg);
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return retval;
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}
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int
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main(int argc, char *argv[])
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{
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const char *option;
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const char *user;
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const char *filename;
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/*
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* we establish that this program is running with non-tty stdin.
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* this is to discourage casual use.
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*/
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if (isatty(STDIN_FILENO) || argc < 5)
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{
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fprintf(stderr,
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"This binary is not designed for running in this way.\n");
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return PAM_SYSTEM_ERR;
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}
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option = argv[1];
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user = argv[2];
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filename = (argv[3][0] != '\0') ? argv[3] : NULL;
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if (strcmp(option, "check") == 0 && argc == 5)
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return check_history(user, filename, argv[4]);
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else if (strcmp(option, "save") == 0 && argc == 6)
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return save_history(user, filename, argv[4], argv[5]);
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fprintf(stderr, "This binary is not designed for running in this way.\n");
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return PAM_SYSTEM_ERR;
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}
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