source: branches/3.2/mindi-busybox/libbb/correct_password.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 2.9 KB
Line 
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 "libbb.h"
32
33/* Ask the user for a password.
34 * Return 1 if the user gives the correct password for entry PW,
35 * 0 if not.  Return 1 without asking if PW has an empty password.
36 *
37 * NULL pw means "just fake it for login with bad username" */
38
39int FAST_FUNC correct_password(const struct passwd *pw)
40{
41    char *unencrypted, *encrypted;
42    const char *correct;
43    int r;
44    /* fake salt. crypt() can choke otherwise. */
45    correct = "aa";
46    if (!pw) {
47        /* "aa" will never match */
48        goto fake_it;
49    }
50    correct = pw->pw_passwd;
51#if ENABLE_FEATURE_SHADOWPASSWDS
52    /* Using _r function to avoid pulling in static buffers */
53    if ((correct[0] == 'x' || correct[0] == '*') && !correct[1]) {
54        struct spwd spw;
55        char buffer[256];
56        /* getspnam_r may return 0 yet set result to NULL.
57         * At least glibc 2.4 does this. Be extra paranoid here. */
58        struct spwd *result = NULL;
59        r = getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result);
60        correct = (r || !result) ? "aa" : result->sp_pwdp;
61    }
62#endif
63
64    if (!correct[0]) /* empty password field? */
65        return 1;
66
67 fake_it:
68    unencrypted = bb_ask_stdin("Password: ");
69    if (!unencrypted) {
70        return 0;
71    }
72    encrypted = pw_encrypt(unencrypted, correct, 1);
73    r = (strcmp(encrypted, correct) == 0);
74    free(encrypted);
75    memset(unencrypted, 0, strlen(unencrypted));
76    return r;
77}
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