| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | * 1. Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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| 15 | * may be used to endorse or promote products derived from this software
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| 16 | * without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 28 | * SUCH DAMAGE.
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| 29 | */
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| 30 |
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| 31 | #include "libbb.h"
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| 32 |
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| 33 | /* Ask the user for a password.
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| 34 | * Return 1 if the user gives the correct password for entry PW,
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| 35 | * 0 if not. Return 1 without asking if PW has an empty password.
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| 36 | *
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| 37 | * NULL pw means "just fake it for login with bad username" */
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| 38 |
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| 39 | int FAST_FUNC correct_password(const struct passwd *pw)
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| 40 | {
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| 41 | char *unencrypted, *encrypted;
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| 42 | const char *correct;
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| 43 | int r;
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| 44 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 45 | /* Using _r function to avoid pulling in static buffers */
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| 46 | struct spwd spw;
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| 47 | char buffer[256];
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| 48 | #endif
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| 49 |
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| 50 | /* fake salt. crypt() can choke otherwise. */
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| 51 | correct = "aa";
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| 52 | if (!pw) {
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| 53 | /* "aa" will never match */
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| 54 | goto fake_it;
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| 55 | }
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| 56 | correct = pw->pw_passwd;
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| 57 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 58 | if ((correct[0] == 'x' || correct[0] == '*') && !correct[1]) {
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| 59 | /* getspnam_r may return 0 yet set result to NULL.
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| 60 | * At least glibc 2.4 does this. Be extra paranoid here. */
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| 61 | struct spwd *result = NULL;
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| 62 | r = getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result);
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| 63 | correct = (r || !result) ? "aa" : result->sp_pwdp;
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| 64 | }
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| 65 | #endif
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| 66 |
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| 67 | if (!correct[0]) /* empty password field? */
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| 68 | return 1;
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| 69 |
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| 70 | fake_it:
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| 71 | unencrypted = bb_ask_stdin("Password: ");
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| 72 | if (!unencrypted) {
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| 73 | return 0;
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| 74 | }
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| 75 | encrypted = pw_encrypt(unencrypted, correct, 1);
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| 76 | r = (strcmp(encrypted, correct) == 0);
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| 77 | free(encrypted);
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| 78 | memset(unencrypted, 0, strlen(unencrypted));
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| 79 | return r;
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| 80 | }
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