mirror of https://github.com/sudo-project/sudo.git
91 lines
2.7 KiB
C
91 lines
2.7 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/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 <errno.h>
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#include <fcntl.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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#include <sudo_util.h>
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/*
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* Wrapper for openat(2) that sets umask and retries as iolog_uid/iolog_gid
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* if openat(2) returns EACCES.
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*/
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int
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iolog_openat(int dfd, const char *path, int flags)
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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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mode_t omask = S_IRWXG|S_IRWXO;
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int fd;
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debug_decl(iolog_openat, SUDO_DEBUG_UTIL);
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if (ISSET(flags, O_CREAT)) {
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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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}
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fd = openat(dfd, path, flags, iolog_filemode);
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if (fd == -1 && errno == EACCES) {
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/* Enable write bit if it is missing. */
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struct stat sb;
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if (fstatat(dfd, path, &sb, 0) == 0) {
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mode_t write_bits = iolog_filemode & (S_IWUSR|S_IWGRP|S_IWOTH);
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if ((sb.st_mode & write_bits) != write_bits) {
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if (fchmodat(dfd, path, iolog_filemode, 0) == 0)
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fd = openat(dfd, path, flags, iolog_filemode);
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}
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}
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}
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if (fd == -1 && errno == EACCES) {
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/* Try again as the I/O log owner (for NFS). */
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if (iolog_swapids(false)) {
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fd = openat(dfd, path, flags, iolog_filemode);
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if (!iolog_swapids(true)) {
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/* iolog_swapids() warns on error. */
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if (fd != -1) {
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close(fd);
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fd = -1;
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}
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}
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}
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}
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if (ISSET(flags, O_CREAT))
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umask(omask);
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debug_return_int(fd);
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}
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