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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2001, 2003, 2004, 2008-2011, 2013, 2015, 2017, 2018, 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>
#if (!defined(HAVE_MKDTEMPAT) && !defined(HAVE_MKDTEMPAT_NP)) || \
(!defined(HAVE_MKOSTEMPSAT) && !defined(HAVE_MKOSTEMPSAT_NP))
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#if defined(HAVE_STDINT_H)
# include <stdint.h>
#elif defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#endif
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include "sudo_compat.h"
#include "sudo_rand.h"
#include "pathnames.h"
#define MKTEMP_FILE 1
#define MKTEMP_DIR 2
#define TEMPCHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
#define NUM_CHARS (sizeof(TEMPCHARS) - 1)
#define MIN_X 6
#define MKOTEMP_FLAGS (O_APPEND | O_CLOEXEC | O_SYNC)
static int
mktemp_internal(int dfd, char *path, int slen, int mode, int flags)
{
char *start, *cp, *ep;
const char tempchars[] = TEMPCHARS;
unsigned int tries;
size_t len;
int fd;
len = strlen(path);
if (len < MIN_X || slen < 0 || (size_t)slen > len - MIN_X) {
errno = EINVAL;
return -1;
}
ep = path + len - slen;
for (start = ep; start > path && start[-1] == 'X'; start--)
;
if (ep - start < MIN_X) {
errno = EINVAL;
return -1;
}
if (flags & ~MKOTEMP_FLAGS) {
errno = EINVAL;
return -1;
}
flags |= O_CREAT | O_EXCL | O_RDWR;
tries = INT_MAX;
do {
cp = start;
do {
unsigned short rbuf[16];
unsigned int i;
/*
* Avoid lots of arc4random() calls by using
* a buffer sized for up to 16 Xs at a time.
*/
arc4random_buf(rbuf, sizeof(rbuf));
for (i = 0; i < nitems(rbuf) && cp != ep; i++)
*cp++ = tempchars[rbuf[i] % NUM_CHARS];
} while (cp != ep);
switch (mode) {
case MKTEMP_FILE:
fd = openat(dfd, path, flags, S_IRUSR|S_IWUSR);
if (fd != -1 || errno != EEXIST)
return fd;
break;
case MKTEMP_DIR:
if (mkdirat(dfd, path, S_IRWXU) == 0)
return 0;
if (errno != EEXIST)
return -1;
break;
}
} while (--tries);
errno = EEXIST;
return -1;
}
char *
sudo_mkdtemp(char *path)
{
if (mktemp_internal(AT_FDCWD, path, 0, MKTEMP_DIR, 0) == -1)
return NULL;
return path;
}
char *
sudo_mkdtempat(int dfd, char *path)
{
if (mktemp_internal(dfd, path, 0, MKTEMP_DIR, 0) == -1)
return NULL;
return path;
}
int
sudo_mkostempsat(int dfd, char *path, int slen, int flags)
{
return mktemp_internal(dfd, path, slen, MKTEMP_FILE, flags);
}
#ifdef notyet
int
sudo_mkostemps(char *path, int slen, int flags)
{
return mktemp_internal(AT_FDCWD, path, slen, MKTEMP_FILE, flags);
}
#endif
int
sudo_mkstemp(char *path)
{
return mktemp_internal(AT_FDCWD, path, 0, MKTEMP_FILE, 0);
}
#ifdef notyet
int
sudo_mkostemp(char *path, int flags)
{
return mktemp_internal(AT_FDCWD, path, 0, MKTEMP_FILE, flags);
}
#endif
int
sudo_mkstemps(char *path, int slen)
{
return mktemp_internal(AT_FDCWD, path, slen, MKTEMP_FILE, 0);
}
#endif /* !HAVE_MKDTEMPAT || !HAVE_MKOSTEMPSAT */
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