| /* 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 if the user gives the correct password for entry PW, |
| * 0 if not. Return 1 without asking if PW has an empty password. |
| * |
| * NULL pw means "just fake it for login with bad username" */ |
| |
| int FAST_FUNC correct_password(const struct passwd *pw) |
| { |
| char *unencrypted, *encrypted; |
| const char *correct; |
| int r; |
| #if ENABLE_FEATURE_SHADOWPASSWDS |
| /* Using _r function to avoid pulling in static buffers */ |
| struct spwd spw; |
| char buffer[256]; |
| #endif |
| |
| /* 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 |
| if ((correct[0] == 'x' || correct[0] == '*') && !correct[1]) { |
| /* 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("Password: "); |
| if (!unencrypted) { |
| return 0; |
| } |
| encrypted = pw_encrypt(unencrypted, correct, 1); |
| r = (strcmp(encrypted, correct) == 0); |
| free(encrypted); |
| memset(unencrypted, 0, strlen(unencrypted)); |
| return r; |
| } |