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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 12:52:13 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 12:52:13 +0000
commitf8e5c55a036f0e2e2a958e30456270f3f9eba933 (patch)
tree4a06ff510774a7a3373e492df4e2984d7b0664b1 /lib/util/secure_path.c
parentInitial commit. (diff)
downloadsudo-f8e5c55a036f0e2e2a958e30456270f3f9eba933.tar.xz
sudo-f8e5c55a036f0e2e2a958e30456270f3f9eba933.zip
Adding upstream version 1.9.5p2.upstream/1.9.5p2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/util/secure_path.c')
-rw-r--r--lib/util/secure_path.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/lib/util/secure_path.c b/lib/util/secure_path.c
new file mode 100644
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--- /dev/null
+++ b/lib/util/secure_path.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2012, 2014-2016 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 <string.h>
+
+#include "sudo_compat.h"
+#include "sudo_util.h"
+#include "sudo_debug.h"
+
+/*
+ * Verify that path is the right type and not writable by other users.
+ */
+static int
+sudo_secure_path(const char *path, unsigned int type, uid_t uid, gid_t gid, struct stat *sbp)
+{
+ struct stat sb;
+ int ret = SUDO_PATH_MISSING;
+ debug_decl(sudo_secure_path, SUDO_DEBUG_UTIL);
+
+ if (path != NULL && stat(path, &sb) == 0) {
+ if ((sb.st_mode & _S_IFMT) != type) {
+ ret = SUDO_PATH_BAD_TYPE;
+ } else if (uid != (uid_t)-1 && sb.st_uid != uid) {
+ ret = SUDO_PATH_WRONG_OWNER;
+ } else if (sb.st_mode & S_IWOTH) {
+ ret = SUDO_PATH_WORLD_WRITABLE;
+ } else if (ISSET(sb.st_mode, S_IWGRP) &&
+ (gid == (gid_t)-1 || sb.st_gid != gid)) {
+ ret = SUDO_PATH_GROUP_WRITABLE;
+ } else {
+ ret = SUDO_PATH_SECURE;
+ }
+ if (sbp)
+ (void) memcpy(sbp, &sb, sizeof(struct stat));
+ }
+
+ debug_return_int(ret);
+}
+
+/*
+ * Verify that path is a regular file and not writable by other users.
+ */
+int
+sudo_secure_file_v1(const char *path, uid_t uid, gid_t gid, struct stat *sbp)
+{
+ return sudo_secure_path(path, _S_IFREG, uid, gid, sbp);
+}
+
+/*
+ * Verify that path is a directory and not writable by other users.
+ */
+int
+sudo_secure_dir_v1(const char *path, uid_t uid, gid_t gid, struct stat *sbp)
+{
+ return sudo_secure_path(path, _S_IFDIR, uid, gid, sbp);
+}