/* 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; }