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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2009-2022 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 <unistd.h>
#include <errno.h>
#include <fcntl.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>
/*
* Create directory and any parent directories as needed.
*/
bool
iolog_mkdirs(const 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 = true, uid_changed = false;
struct stat sb;
mode_t omask;
int dfd;
debug_decl(iolog_mkdirs, SUDO_DEBUG_UTIL);
dfd = open(path, O_RDONLY|O_NONBLOCK);
if (dfd == -1 && errno == EACCES) {
/* Try again as the I/O log owner (for NFS). */
if (iolog_swapids(false)) {
dfd = open(path, O_RDONLY|O_NONBLOCK);
if (!iolog_swapids(true)) {
ok = false;
goto done;
}
}
}
if (dfd != -1 && fstat(dfd, &sb) != -1) {
if (S_ISDIR(sb.st_mode)) {
if (sb.st_uid != iolog_uid || sb.st_gid != iolog_gid) {
if (fchown(dfd, iolog_uid, iolog_gid) != 0) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to chown %d:%d %s", __func__,
(int)iolog_uid, (int)iolog_gid, path);
}
}
if ((sb.st_mode & ALLPERMS) != iolog_dirmode) {
if (fchmod(dfd, iolog_dirmode) != 0) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to chmod 0%o %s", __func__,
(int)iolog_dirmode, path);
}
}
} else {
sudo_warnx(U_("%s exists but is not a directory (0%o)"),
path, (unsigned int) sb.st_mode);
errno = ENOTDIR;
ok = false;
}
goto done;
}
/* umask must not be more restrictive than the file modes. */
omask = umask(ACCESSPERMS & ~(iolog_filemode|iolog_dirmode));
ok = false;
if (dfd != -1)
close(dfd);
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. */
const char *base = sudo_basename(path);
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"mkdir %s, mode 0%o", path, (unsigned int) iolog_dirmode);
ok = mkdirat(dfd, base, iolog_dirmode) == 0 || errno == EEXIST;
if (!ok) {
if (errno == EACCES && !uid_changed) {
/* Try again as the I/O log owner (for NFS). */
uid_changed = iolog_swapids(false);
if (uid_changed)
ok = mkdirat(dfd, base, iolog_dirmode) == 0 || errno == EEXIST;
}
if (!ok)
sudo_warn(U_("unable to mkdir %s"), path);
} else {
if (fchownat(dfd, base, iolog_uid, iolog_gid, AT_SYMLINK_NOFOLLOW) != 0) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to chown %d:%d %s", __func__,
(int)iolog_uid, (int)iolog_gid, path);
}
}
}
if (uid_changed) {
if (!iolog_swapids(true))
ok = false;
}
umask(omask);
done:
if (dfd != -1)
close(dfd);
debug_return_bool(ok);
}
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