125 lines
4.1 KiB
C
125 lines
4.1 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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#define SHADOW_BUFSIZE 256
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/* Retrieve encrypted password string for pw.
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* If pw == NULL, return a string which fails password check against any
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* password.
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*/
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#if !ENABLE_FEATURE_SHADOWPASSWDS
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#define get_passwd(pw, buffer) get_passwd(pw)
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#endif
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static const char *get_passwd(const struct passwd *pw, char buffer[SHADOW_BUFSIZE])
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{
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const char *pass;
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if (!pw)
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return "aa"; /* "aa" will never match */
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pass = 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 ((pass[0] == 'x' || pass[0] == '*') && !pass[1]) {
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struct spwd spw;
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int r;
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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, SHADOW_BUFSIZE, &result);
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pass = (r || !result) ? "aa" : result->sp_pwdp;
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}
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#endif
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return pass;
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}
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/*
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* Return CHECKPASS_PW_HAS_EMPTY_PASSWORD if PW has an empty password.
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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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* NULL pw means "just fake it for login with bad username"
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*/
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int FAST_FUNC check_password(const struct passwd *pw, const char *plaintext)
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{
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IF_FEATURE_SHADOWPASSWDS(char buffer[SHADOW_BUFSIZE];)
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char *encrypted;
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const char *pw_pass;
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int r;
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pw_pass = get_passwd(pw, buffer);
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if (!pw_pass[0]) { /* empty password field? */
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return CHECKPASS_PW_HAS_EMPTY_PASSWORD;
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}
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encrypted = pw_encrypt(plaintext, /*salt:*/ pw_pass, 1);
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r = (strcmp(encrypted, pw_pass) == 0);
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free(encrypted);
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return r;
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}
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/* Ask the user for a password.
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* Return CHECKPASS_PW_HAS_EMPTY_PASSWORD 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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IF_FEATURE_SHADOWPASSWDS(char buffer[SHADOW_BUFSIZE];)
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char *plaintext;
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const char *pw_pass;
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int r;
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pw_pass = get_passwd(pw, buffer);
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if (!pw_pass[0]) /* empty password field? */
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return CHECKPASS_PW_HAS_EMPTY_PASSWORD;
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plaintext = bb_ask(STDIN_FILENO, timeout, prompt);
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if (!plaintext) {
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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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r = check_password(pw, plaintext);
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nuke_str(plaintext);
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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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