1 files changed, 73 insertions, 0 deletions
diff --git a/plugins/sudoers/goodpath.c b/plugins/sudoers/goodpath.c
new file mode 100644
index 0000000..c4c8bbd
--- /dev/null
+++ b/plugins/sudoers/goodpath.c
@@ -0,0 +1,73 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 1996, 1998-2005, 2010-2012, 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.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+/*
+ * 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 <string.h>
+#include <errno.h>
+
+#include "sudoers.h"
+
+/*
+ * Verify that path is a normal file and executable by root.
+ */
+bool
+sudo_goodpath(const char *path, const char *runchroot, struct stat *sbp)
+{
+    bool ret = false;
+    debug_decl(sudo_goodpath, SUDOERS_DEBUG_UTIL);
+
+    if (path != NULL) {
+	char pathbuf[PATH_MAX];
+	struct stat sb;
+
+	if (runchroot != NULL) {
+	    const int len =
+		snprintf(pathbuf, sizeof(pathbuf), "%s%s", runchroot, path);
+	    if (len >= ssizeof(pathbuf)) {
+		errno = ENAMETOOLONG;
+		goto done;
+	    }
+	    path = pathbuf; // -V507
+	}
+	if (sbp == NULL)
+	    sbp = &sb;
+
+	if (stat(path, sbp) == 0) {
+	    /* Make sure path describes an executable regular file. */
+	    if (S_ISREG(sbp->st_mode) && ISSET(sbp->st_mode, S_IXUSR|S_IXGRP|S_IXOTH))
+		ret = true;
+	    else
+		errno = EACCES;
+	}
+    }
+done:
+    debug_return_bool(ret);
+}