| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | * 1. Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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| 15 | * may be used to endorse or promote products derived from this software
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| 16 | * without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 28 | * SUCH DAMAGE.
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| 29 | */
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| 30 |
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| 31 | #include "libbb.h"
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| 32 |
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| 33 | /* Become the user and group(s) specified by PW. */
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| 34 | void FAST_FUNC change_identity(const struct passwd *pw)
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| 35 | {
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| 36 | int res;
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| 37 |
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| 38 | res = initgroups(pw->pw_name, pw->pw_gid);
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| 39 | endgrent(); /* helps to close a fd used internally by libc */
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| 40 |
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| 41 | if (res != 0) {
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| 42 | /*
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| 43 | * If initgroups() fails because a system call is unimplemented
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| 44 | * then we are running on a Linux kernel compiled without multiuser
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| 45 | * support (CONFIG_MULTIUSER is not defined).
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| 46 | *
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| 47 | * If we are running without multiuser support *and* the target uid
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| 48 | * already matches the current uid then we can skip the change of
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| 49 | * identity.
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| 50 | */
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| 51 | if (errno == ENOSYS && pw->pw_uid == getuid()) {
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| 52 | return;
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| 53 | }
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| 54 |
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| 55 | bb_perror_msg_and_die("can't set groups");
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| 56 | }
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| 57 |
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| 58 | xsetgid(pw->pw_gid);
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| 59 | xsetuid(pw->pw_uid);
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| 60 | }
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