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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 /* HAVE_STDBOOL_H */
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include "sudo_compat.h"
#include "sudo_fatal.h"
#include "sudo_gettext.h"
#include "sudo_debug.h"
#include "sudo_util.h"
#ifndef O_NOFOLLOW
# define O_NOFOLLOW 0
#endif
/*
* Returns true if fd is a directory, else false.
* Warns on failure if not quiet.
*/
static bool
is_dir(int dfd, const char *name, int namelen, bool quiet)
{
struct stat sb;
debug_decl(is_dir, SUDO_DEBUG_UTIL);
if (fstat(dfd, &sb) != 0) {
if (!quiet) {
sudo_warn(U_("unable to stat %.*s"), namelen, name);
}
debug_return_bool(false);
}
if (!S_ISDIR(sb.st_mode)) {
if (!quiet) {
sudo_warnx(U_("%.*s exists but is not a directory (0%o)"),
namelen, name, (unsigned int) sb.st_mode);
}
debug_return_bool(false);
}
debug_return_bool(true);
}
/*
* Create any parent directories needed by path (but not path itself)
* and return an open fd for the parent directory or -1 on error.
*/
int
sudo_open_parent_dir_v1(const char *path, uid_t uid, gid_t gid, mode_t mode,
bool quiet)
{
const char *cp, *ep, *pathend;
char name[PATH_MAX];
int parentfd;
debug_decl(sudo_open_parent_dir, SUDO_DEBUG_UTIL);
/* Starting parent dir is either root or cwd. */
cp = path;
if (*cp == '/') {
do {
cp++;
} while (*cp == '/');
parentfd = open("/", O_RDONLY|O_NONBLOCK);
} else {
parentfd = open(".", O_RDONLY|O_NONBLOCK);
}
if (parentfd == -1) {
if (!quiet)
sudo_warn(U_("unable to open %s"), *path == '/' ? "/" : ".");
debug_return_int(-1);
}
/* Iterate over path components, skipping the last one. */
pathend = cp + strlen(cp);
for (cp = sudo_strsplit(cp, pathend, "/", &ep); cp != NULL && ep < pathend;
cp = sudo_strsplit(NULL, pathend, "/", &ep)) {
size_t len = (size_t)(ep - cp);
int dfd;
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"mkdir %.*s, mode 0%o, uid %d, gid %d", (int)(ep - path), path,
(unsigned int)mode, (int)uid, (int)gid);
if (len >= sizeof(name)) {
errno = ENAMETOOLONG;
if (!quiet)
sudo_warn(U_("unable to mkdir %.*s"), (int)(ep - path), path);
goto bad;
}
memcpy(name, cp, len);
name[len] = '\0';
reopen:
dfd = openat(parentfd, name, O_RDONLY|O_NONBLOCK, 0);
if (dfd == -1) {
if (errno != ENOENT) {
if (!quiet) {
sudo_warn(U_("unable to open %.*s"),
(int)(ep - path), path);
}
goto bad;
}
if (mkdirat(parentfd, name, mode) == 0) {
dfd = openat(parentfd, name, O_RDONLY|O_NONBLOCK|O_NOFOLLOW, 0);
if (dfd == -1) {
if (!quiet) {
sudo_warn(U_("unable to open %.*s"),
(int)(ep - path), path);
}
goto bad;
}
/* Make sure the path we created is still a directory. */
if (!is_dir(dfd, path, ep - path, quiet)) {
close(dfd);
goto bad;
}
if (uid != (uid_t)-1 && gid != (gid_t)-1) {
if (fchown(dfd, uid, gid) != 0) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to chown %d:%d %.*s", __func__,
(int)uid, (int)gid, (int)(ep - path), path);
}
}
} else {
if (errno == EEXIST)
goto reopen;
if (!quiet) {
sudo_warn(U_("unable to mkdir %.*s"),
(int)(ep - path), path);
}
goto bad;
}
} else {
/* Already exists, make sure it is a directory. */
if (!is_dir(dfd, path, ep - path, quiet)) {
close(dfd);
goto bad;
}
}
close(parentfd);
parentfd = dfd;
}
debug_return_int(parentfd);
bad:
if (parentfd != -1)
close(parentfd);
debug_return_int(-1);
}
/*
* Create any parent directories needed by path (but not path itself).
* Not currently used.
*/
bool
sudo_mkdir_parents_v1(const char *path, uid_t uid, gid_t gid, mode_t mode,
bool quiet)
{
int fd;
debug_decl(sudo_mkdir_parents, SUDO_DEBUG_UTIL);
fd = sudo_open_parent_dir(path, uid, gid, mode, quiet);
if (fd == -1)
debug_return_bool(false);
close(fd);
debug_return_bool(true);
}
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