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