87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
|
|
/* Ask the user for a password.
|
|
* Return 1 without asking if PW has an empty password.
|
|
* Return -1 on EOF, error while reading input, or timeout.
|
|
* Return 1 if the user gives the correct password for entry PW,
|
|
* 0 if not.
|
|
*
|
|
* NULL pw means "just fake it for login with bad username"
|
|
*/
|
|
int FAST_FUNC ask_and_check_password_extended(const struct passwd *pw,
|
|
int timeout, const char *prompt)
|
|
{
|
|
char *unencrypted, *encrypted;
|
|
const char *correct;
|
|
int r;
|
|
/* fake salt. crypt() can choke otherwise. */
|
|
correct = "aa";
|
|
if (!pw) {
|
|
/* "aa" will never match */
|
|
goto fake_it;
|
|
}
|
|
correct = pw->pw_passwd;
|
|
#if ENABLE_FEATURE_SHADOWPASSWDS
|
|
/* Using _r function to avoid pulling in static buffers */
|
|
if ((correct[0] == 'x' || correct[0] == '*') && !correct[1]) {
|
|
struct spwd spw;
|
|
char buffer[256];
|
|
/* getspnam_r may return 0 yet set result to NULL.
|
|
* At least glibc 2.4 does this. Be extra paranoid here. */
|
|
struct spwd *result = NULL;
|
|
r = getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result);
|
|
correct = (r || !result) ? "aa" : result->sp_pwdp;
|
|
}
|
|
#endif
|
|
|
|
if (!correct[0]) /* empty password field? */
|
|
return 1;
|
|
|
|
fake_it:
|
|
unencrypted = bb_ask(STDIN_FILENO, timeout, prompt);
|
|
if (!unencrypted) {
|
|
/* EOF (such as ^D) or error (such as ^C) or timeout */
|
|
return -1;
|
|
}
|
|
encrypted = pw_encrypt(unencrypted, correct, 1);
|
|
r = (strcmp(encrypted, correct) == 0);
|
|
free(encrypted);
|
|
nuke_str(unencrypted);
|
|
return r;
|
|
}
|
|
|
|
int FAST_FUNC ask_and_check_password(const struct passwd *pw)
|
|
{
|
|
return ask_and_check_password_extended(pw, 0, "Password: ");
|
|
}
|