1 files changed, 125 insertions, 0 deletions
diff --git a/lib/libveriexec/gbl_check.c b/lib/libveriexec/gbl_check.c
new file mode 100644
index 000000000000..c0da93d0857c
--- /dev/null
+++ b/lib/libveriexec/gbl_check.c
@@ -0,0 +1,125 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2019-2023, Juniper Networks, Inc.
+ * All rights reserved.
+ *
+ * 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 ``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 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.
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/mac.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <security/mac_grantbylabel/mac_grantbylabel.h>
+
+/**
+ * @brief does path have a gbl label
+ *
+ * @return
+ * @li 0 if no/empty label or module not loaded
+ * @li value of label
+ */
+unsigned int
+gbl_check_path(const char *path)
+{
+	struct mac_grantbylabel_fetch_gbl_args gbl;
+	int fd;
+	int rc;
+
+	rc = 0;
+	if ((fd = open(path, O_RDONLY|O_VERIFY)) >= 0) {
+		gbl.u.fd = fd;
+		if (mac_syscall(MAC_GRANTBYLABEL_NAME,
+			MAC_GRANTBYLABEL_FETCH_GBL,
+			&gbl) == 0) {
+			if (gbl.gbl != GBL_EMPTY)
+				rc = gbl.gbl;
+		}
+		close(fd);
+	}
+	return(rc);
+}
+
+/**
+ * @brief does pid have a gbl label
+ *
+ * @return
+ * @li 0 if no/empty label or module not loaded
+ * @li value of label
+ */
+unsigned int
+gbl_check_pid(pid_t pid)
+{
+	struct mac_grantbylabel_fetch_gbl_args gbl;
+	int rc;
+
+	rc = 0;
+	gbl.u.pid = pid;
+	if (mac_syscall(MAC_GRANTBYLABEL_NAME,
+		MAC_GRANTBYLABEL_FETCH_PID_GBL, &gbl) == 0) {
+		if (gbl.gbl != GBL_EMPTY)
+			rc = gbl.gbl;
+	}
+	return(rc);
+}
+
+
+#ifdef UNIT_TEST
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+
+int
+main(int argc, char *argv[])
+{
+	pid_t pid;
+	int pflag = 0;
+	int c;
+	unsigned int gbl;
+
+	while ((c = getopt(argc, argv, "p")) != -1) {
+		switch (c) {
+		case 'p':
+			pflag = 1;
+			break;
+		default:
+			break;
+		}
+	}
+	for (; optind < argc; optind++) {
+
+		if (pflag) {
+			pid = atoi(argv[optind]);
+			gbl = gbl_check_pid(pid);
+		} else {
+			gbl = gbl_check_path(argv[optind]);
+		}
+		printf("arg=%s, gbl=%#o\n", argv[optind], gbl);
+	}
+	return 0;
+}
+#endif