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87 lines
3.1 KiB
C
87 lines
3.1 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 without asking if PW has an empty password.
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* Return -1 on EOF, error while reading input, or timeout.
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* Return 1 if the user gives the correct password for entry PW,
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* 0 if not.
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*
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* NULL pw means "just fake it for login with bad username"
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*/
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int FAST_FUNC ask_and_check_password_extended(const struct passwd *pw,
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int timeout, const char *prompt)
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{
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char *unencrypted, *encrypted;
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const char *correct;
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int r;
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/* fake salt. crypt() can choke otherwise. */
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correct = "aa";
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if (!pw) {
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/* "aa" will never match */
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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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/* Using _r function to avoid pulling in static buffers */
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if ((correct[0] == 'x' || correct[0] == '*') && !correct[1]) {
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struct spwd spw;
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char buffer[256];
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/* getspnam_r may return 0 yet set result to NULL.
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* At least glibc 2.4 does this. Be extra paranoid here. */
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struct spwd *result = NULL;
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r = getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result);
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correct = (r || !result) ? "aa" : result->sp_pwdp;
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}
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#endif
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if (!correct[0]) /* empty password field? */
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return 1;
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fake_it:
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unencrypted = bb_ask(STDIN_FILENO, timeout, prompt);
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if (!unencrypted) {
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/* EOF (such as ^D) or error (such as ^C) or timeout */
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return -1;
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}
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encrypted = pw_encrypt(unencrypted, correct, 1);
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r = (strcmp(encrypted, correct) == 0);
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free(encrypted);
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nuke_str(unencrypted);
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return r;
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}
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int FAST_FUNC ask_and_check_password(const struct passwd *pw)
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{
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return ask_and_check_password_extended(pw, 0, "Password: ");
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}
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