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-rw-r--r--lib/util/mkdir_parents.c199
1 files changed, 199 insertions, 0 deletions
diff --git a/lib/util/mkdir_parents.c b/lib/util/mkdir_parents.c
new file mode 100644
index 0000000..b483748
--- /dev/null
+++ b/lib/util/mkdir_parents.c
@@ -0,0 +1,199 @@
+/*
+ * 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, (int)(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, (int)(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);
+}