mirror of https://github.com/sudo-project/sudo.git
103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2009-2021 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_STDBOOL_H
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# include <stdbool.h>
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#else
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# include <compat/stdbool.h>
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#endif
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#include <time.h>
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#include <unistd.h>
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#include <sudo_compat.h>
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#include <sudo_debug.h>
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#include <sudo_fatal.h>
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#include <sudo_gettext.h>
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#include <sudo_iolog.h>
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/*
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* Set effective user and group-IDs to iolog_uid and iolog_gid.
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* If restore flag is set, swap them back.
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*/
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bool
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iolog_swapids(bool restore)
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{
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#ifdef HAVE_SETEUID
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static uid_t user_euid = (uid_t)-1;
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static gid_t user_egid = (gid_t)-1;
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const uid_t iolog_uid = iolog_get_uid();
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const gid_t iolog_gid = iolog_get_gid();
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debug_decl(io_swapids, SUDO_DEBUG_UTIL);
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if (user_euid == (uid_t)-1)
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user_euid = geteuid();
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if (user_egid == (gid_t)-1)
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user_egid = getegid();
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if (user_euid == iolog_uid && user_egid == iolog_gid) {
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sudo_debug_printf(SUDO_DEBUG_NOTICE,
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"%s: effective uid/gid matches iolog uid/gid, nothing to do",
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__func__);
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debug_return_bool(true);
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}
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if (restore) {
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if (seteuid(user_euid) == -1) {
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
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"%s: unable to restore effective uid to %d", __func__,
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(int)user_euid);
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sudo_warn("seteuid() %d -> %d", (int)iolog_uid, (int)user_euid);
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debug_return_bool(false);
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}
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if (setegid(user_egid) == -1) {
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
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"%s: unable to restore effective gid to %d", __func__,
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(int)user_egid);
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sudo_warn("setegid() %d -> %d", (int)iolog_gid, (int)user_egid);
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debug_return_bool(false);
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}
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} else {
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/* Fail silently if the user has insufficient privileges. */
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if (setegid(iolog_gid) == -1) {
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
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"%s: unable to set effective gid to %d", __func__,
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(int)iolog_gid);
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debug_return_bool(false);
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}
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if (seteuid(iolog_uid) == -1) {
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
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"%s: unable to set effective uid to %d", __func__,
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(int)iolog_uid);
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debug_return_bool(false);
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}
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}
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debug_return_bool(true);
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#else
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return false;
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#endif
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}
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