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-rw-r--r--lib/util/mktemp.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/lib/util/mktemp.c b/lib/util/mktemp.c
new file mode 100644
index 0000000..1540e51
--- /dev/null
+++ b/lib/util/mktemp.c
@@ -0,0 +1,172 @@
+/*
+ * 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 */