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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2009-2021 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include "compat/stdbool.h"
#endif
#include <time.h>
#include <unistd.h>
#include "sudo_compat.h"
#include "sudo_debug.h"
#include "sudo_fatal.h"
#include "sudo_gettext.h"
#include "sudo_iolog.h"
/*
* Set effective user and group-IDs to iolog_uid and iolog_gid.
* If restore flag is set, swap them back.
*/
bool
iolog_swapids(bool restore)
{
#ifdef HAVE_SETEUID
static uid_t user_euid = (uid_t)-1;
static gid_t user_egid = (gid_t)-1;
const uid_t iolog_uid = iolog_get_uid();
const gid_t iolog_gid = iolog_get_gid();
debug_decl(io_swapids, SUDO_DEBUG_UTIL);
if (user_euid == (uid_t)-1)
user_euid = geteuid();
if (user_egid == (gid_t)-1)
user_egid = getegid();
if (restore) {
if (seteuid(user_euid) == -1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to restore effective uid to %d", __func__,
(int)user_euid);
sudo_warn("seteuid() %d -> %d", (int)iolog_uid, (int)user_euid);
debug_return_bool(false);
}
if (setegid(user_egid) == -1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to restore effective gid to %d", __func__,
(int)user_egid);
sudo_warn("setegid() %d -> %d", (int)iolog_gid, (int)user_egid);
debug_return_bool(false);
}
} else {
/* Fail silently if the user has insufficient privileges. */
if (setegid(iolog_gid) == -1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to set effective gid to %d", __func__,
(int)iolog_gid);
debug_return_bool(false);
}
if (seteuid(iolog_uid) == -1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to set effective uid to %d", __func__,
(int)iolog_uid);
debug_return_bool(false);
}
}
debug_return_bool(true);
#else
return false;
#endif
}
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