1 /* vi: set sw=4 ts=4: */
3 * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 /* Ask the user for a password.
34 Return 1 if the user gives the correct password for entry PW,
35 0 if not. Return 1 without asking for a password if run by UID 0
36 or if PW has an empty password. */
38 int correct_password(const struct passwd *pw)
40 char *unencrypted, *encrypted;
42 #if ENABLE_FEATURE_SHADOWPASSWDS
43 /* Using _r function to avoid pulling in static buffers */
49 correct = pw->pw_passwd;
50 #if ENABLE_FEATURE_SHADOWPASSWDS
51 if (LONE_CHAR(pw->pw_passwd, 'x') || LONE_CHAR(pw->pw_passwd, '*')) {
52 if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result))
53 bb_error_msg("no valid shadow password, checking ordinary one");
55 correct = spw.sp_pwdp;
59 if (!correct || correct[0] == '\0')
62 unencrypted = bb_askpass(0, "Password: ");
66 encrypted = crypt(unencrypted, correct);
67 memset(unencrypted, 0, strlen(unencrypted));
68 return strcmp(encrypted, correct) == 0;