1 files changed, 135 insertions, 0 deletions
diff --git a/tools/regression/priv/priv_io.c b/tools/regression/priv/priv_io.c
new file mode 100644
index 0000000..1af1847
--- /dev/null
+++ b/tools/regression/priv/priv_io.c
@@ -0,0 +1,135 @@
+/*-
+ * Copyright (c) 2006 nCircle Network Security, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert N. M. Watson for the TrustedBSD
+ * Project under contract to nCircle Network Security, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
+ * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Test privilege check on /dev/io.  By default, the permissions also protect
+ * against non-superuser access, so this program will modify permissions on
+ * /dev/io to allow group access for the wheel group, and revert the change
+ * on exit.  This is not good for run-time security, but is necessary to test
+ * the checks properly.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "main.h"
+
+#define	NEW_PERMS	0660
+#define	DEV_IO		"/dev/io"
+#define	EXPECTED_PERMS	0600
+
+static mode_t	saved_perms;
+
+static void
+save_perms(void)
+{
+	struct stat sb;
+
+	if (stat(DEV_IO, &sb) < 0)
+		err(-1, "save_perms: stat(%s)", DEV_IO);
+
+	saved_perms = sb.st_mode & ALLPERMS;
+
+	if (saved_perms != EXPECTED_PERMS)
+		err(-1, "save_perms: perms = 0%o; expected 0%o", saved_perms,
+		    EXPECTED_PERMS);
+
+}
+
+static void
+set_perms(void)
+{
+
+	if (chmod(DEV_IO, NEW_PERMS) < 0)
+		err(-1, "set_perms: chmod(%s, 0%o)", DEV_IO, NEW_PERMS);
+}
+
+static void
+restore_perms(void)
+{
+
+	if (chmod(DEV_IO, saved_perms) < 0)
+		err(-1, "restore_perms: chmod(%s, 0%o)", DEV_IO, saved_perms);
+}
+
+static void
+try_open(const char *test_case, uid_t uid, int expected)
+{
+	int fd;
+
+	set_euid(uid);
+	fd = open(DEV_IO, O_RDONLY);
+	if (expected == 0) {
+		if (fd == -1) {
+			warn("try_open: %s open(%s) errno %d", DEV_IO,
+			    test_case, errno);
+			goto out;
+		}
+		close(fd);
+		goto out;
+	}
+	if (fd >= 0) {
+		warn("try_open: %s open(%s) unexpected success", test_case,
+		    DEV_IO);
+		close(fd);
+		goto out;
+	}
+	if (errno == expected)
+		goto out;
+	warn("try_open: %s open(%s) wrong errno %d, expected %d", DEV_IO,
+	    test_case, errno, expected);
+out:
+	set_euid(UID_ROOT);
+}
+
+void
+priv_io(void)
+{
+
+	assert_root();
+
+	save_perms();
+
+	try_open("root:0600", UID_ROOT, 0);
+	try_open("other", UID_OTHER, EACCES);
+
+	set_perms();
+
+	try_open("root:0660", UID_ROOT, 0);
+	try_open("other", UID_OTHER, EPERM);
+
+	restore_perms();
+}