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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:37:38 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:37:38 +0000
commitae581a19fbe896a797450b9d9573fb66f2735227 (patch)
tree56c40be8518a29c9351364d13a9676aa83932dc0 /lib/iolog/iolog_openat.c
parentInitial commit. (diff)
downloadsudo-ae581a19fbe896a797450b9d9573fb66f2735227.tar.xz
sudo-ae581a19fbe896a797450b9d9573fb66f2735227.zip
Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/iolog/iolog_openat.c')
-rw-r--r--lib/iolog/iolog_openat.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/lib/iolog/iolog_openat.c b/lib/iolog/iolog_openat.c
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+++ b/lib/iolog/iolog_openat.c
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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/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "sudo_compat.h"
+#include "sudo_debug.h"
+#include "sudo_fatal.h"
+#include "sudo_gettext.h"
+#include "sudo_iolog.h"
+#include "sudo_util.h"
+
+/*
+ * Wrapper for openat(2) that sets umask and retries as iolog_uid/iolog_gid
+ * if openat(2) returns EACCES.
+ */
+int
+iolog_openat(int dfd, const char *path, int flags)
+{
+ const mode_t iolog_filemode = iolog_get_file_mode();
+ const mode_t iolog_dirmode = iolog_get_dir_mode();
+ mode_t omask = S_IRWXG|S_IRWXO;
+ int fd;
+ debug_decl(iolog_openat, SUDO_DEBUG_UTIL);
+
+ if (ISSET(flags, O_CREAT)) {
+ /* umask must not be more restrictive than the file modes. */
+ omask = umask(ACCESSPERMS & ~(iolog_filemode|iolog_dirmode));
+ }
+ fd = openat(dfd, path, flags, iolog_filemode);
+ if (fd == -1 && errno == EACCES) {
+ /* Enable write bit if it is missing. */
+ struct stat sb;
+ if (fstatat(dfd, path, &sb, 0) == 0) {
+ mode_t write_bits = iolog_filemode & (S_IWUSR|S_IWGRP|S_IWOTH);
+ if ((sb.st_mode & write_bits) != write_bits) {
+ if (fchmodat(dfd, path, iolog_filemode, 0) == 0)
+ fd = openat(dfd, path, flags, iolog_filemode);
+ }
+ }
+ }
+ if (fd == -1 && errno == EACCES) {
+ /* Try again as the I/O log owner (for NFS). */
+ if (iolog_swapids(false)) {
+ fd = openat(dfd, path, flags, iolog_filemode);
+ if (!iolog_swapids(true)) {
+ /* iolog_swapids() warns on error. */
+ if (fd != -1) {
+ close(fd);
+ fd = -1;
+ }
+ }
+ }
+ }
+ if (ISSET(flags, O_CREAT))
+ umask(omask);
+ debug_return_int(fd);
+}