source: MondoRescue/branches/stable/mindi-busybox/libbb/correct_password.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 2.7 KB
RevLine 
[821]1/* vi: set sw=4 ts=4: */
2/*
3 * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <stdio.h>
32#include <errno.h>
33#include <unistd.h>
34#include <string.h>
35#include <stdlib.h>
36#include <syslog.h>
37#include <ctype.h>
38#include <crypt.h>
39
40#include "libbb.h"
41
42
43
44/* Ask the user for a password.
45   Return 1 if the user gives the correct password for entry PW,
46   0 if not.  Return 1 without asking for a password if run by UID 0
47   or if PW has an empty password.  */
48
49int correct_password ( const struct passwd *pw )
50{
51    char *unencrypted, *encrypted, *correct;
52
53#ifdef CONFIG_FEATURE_SHADOWPASSWDS
54    if (( strcmp ( pw-> pw_passwd, "x" ) == 0 ) || ( strcmp ( pw-> pw_passwd, "*" ) == 0 )) {
55        struct spwd *sp = getspnam ( pw-> pw_name );
56
57        if ( !sp )
58            bb_error_msg_and_die ( "\nno valid shadow password" );
59
60        correct = sp-> sp_pwdp;
61    }
62    else
63#endif
64        correct = pw-> pw_passwd;
65
66    if ( correct == 0 || correct[0] == '\0' )
67        return 1;
68
69    unencrypted = bb_askpass ( 0, "Password: " );
70    if ( !unencrypted )
71    {
72        return 0;
73    }
74    encrypted = crypt ( unencrypted, correct );
75    memset ( unencrypted, 0, strlen ( unencrypted ));
76    return ( strcmp ( encrypted, correct ) == 0 ) ? 1 : 0;
77}
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