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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 <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include <compat/stdbool.h>
#endif
#include <time.h>
#include <errno.h>
#include <sudo_compat.h>
#include <sudo_debug.h>
#include <sudo_fatal.h>
#include <sudo_gettext.h>
#include <sudo_util.h>
#include <sudo_iolog.h>
/*
* Create temporary directory and any parent directories as needed.
*/
bool
iolog_mkdtemp(char *path)
{
const mode_t iolog_filemode = iolog_get_file_mode();
const mode_t iolog_dirmode = iolog_get_dir_mode();
const uid_t iolog_uid = iolog_get_uid();
const gid_t iolog_gid = iolog_get_gid();
bool ok = false, uid_changed = false;
char *dir = sudo_basename(path);
mode_t omask;
int dfd;
debug_decl(iolog_mkdtemp, SUDO_DEBUG_UTIL);
/* umask must not be more restrictive than the file modes. */
omask = umask(ACCESSPERMS & ~(iolog_filemode|iolog_dirmode));
dfd = sudo_open_parent_dir(path, iolog_uid, iolog_gid, iolog_dirmode, true);
if (dfd == -1 && errno == EACCES) {
/* Try again as the I/O log owner (for NFS). */
uid_changed = iolog_swapids(false);
if (uid_changed)
dfd = sudo_open_parent_dir(path, (uid_t)-1, (gid_t)-1,
iolog_dirmode, false);
}
if (dfd != -1) {
/* Create final path component. */
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"mkdtemp %s", path);
/* We cannot retry mkdtemp() so always open as iolog user */
if (!uid_changed)
uid_changed = iolog_swapids(false);
if (mkdtempat(dfd, dir) == NULL) {
sudo_warn(U_("unable to mkdir %s"), path);
ok = false;
} else {
if (fchmodat(dfd, dir, iolog_dirmode, 0) != 0) {
/* Not a fatal error, pre-existing mode is 0700. */
sudo_warn(U_("unable to change mode of %s to 0%o"),
path, (unsigned int)iolog_dirmode);
}
ok = true;
}
close(dfd);
}
umask(omask);
if (uid_changed) {
if (!iolog_swapids(true))
ok = false;
}
debug_return_bool(ok);
}
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