ca525b4f24
correct_password: explain in detail why it is ok to use bb_banner fsck_minix: make it print bb version, not it's own (outdated/irrelevant) one Marginal size difference: text data bss dec hex filename 679119 2700 15632 697451 aa46b busybox_old 679091 2700 15632 697423 aa44f busybox_unstripped
80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
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* All rights reserved.
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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, this list of conditions and the following disclaimer.
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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. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "libbb.h"
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/* Ask the user for a password.
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* Return 1 if the user gives the correct password for entry PW,
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* 0 if not. Return 1 without asking if PW has an empty password.
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*
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* NULL pw means "just fake it for login with bad username" */
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int correct_password(const struct passwd *pw)
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{
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char *unencrypted, *encrypted;
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const char *correct;
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#if ENABLE_FEATURE_SHADOWPASSWDS
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/* Using _r function to avoid pulling in static buffers */
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struct spwd spw;
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struct spwd *result;
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char buffer[256];
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#endif
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/* fake salt. crypt() can choke otherwise.
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* (bb_banner's first two chars are letters and thus are valid salt) */
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correct = bb_banner;
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if (!pw) {
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/* bb_banner will never match, it contains () which is never
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* generated in valid encrypted passwords. */
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goto fake_it;
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}
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correct = pw->pw_passwd;
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#if ENABLE_FEATURE_SHADOWPASSWDS
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if (LONE_CHAR(pw->pw_passwd, 'x') || LONE_CHAR(pw->pw_passwd, '*')) {
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if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result))
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bb_error_msg("no valid shadow password, checking ordinary one");
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else
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correct = spw.sp_pwdp;
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}
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#endif
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if (!correct || correct[0] == '\0')
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return 1;
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fake_it:
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unencrypted = bb_askpass(0, "Password: ");
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if (!unencrypted) {
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return 0;
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}
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encrypted = crypt(unencrypted, correct);
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memset(unencrypted, 0, strlen(unencrypted));
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return strcmp(encrypted, correct) == 0;
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}
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