1/*
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2019-2023, Juniper Networks, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30#include <sys/types.h>
31#include <sys/errno.h>
32#include <sys/mac.h>
33
34#include <unistd.h>
35#include <fcntl.h>
36
37#include <security/mac_grantbylabel/mac_grantbylabel.h>
38
39/**
40 * @brief does path have a gbl label
41 *
42 * @return
43 * @li 0 if no/empty label or module not loaded
44 * @li value of label
45 */
46unsigned int
47gbl_check_path(const char *path)
48{
49	struct mac_grantbylabel_fetch_gbl_args gbl;
50	int fd;
51	int rc;
52
53	rc = 0;
54	if ((fd = open(path, O_RDONLY|O_VERIFY)) >= 0) {
55		gbl.u.fd = fd;
56		if (mac_syscall(MAC_GRANTBYLABEL_NAME,
57			MAC_GRANTBYLABEL_FETCH_GBL,
58			&gbl) == 0) {
59			if (gbl.gbl != GBL_EMPTY)
60				rc = gbl.gbl;
61		}
62		close(fd);
63	}
64	return(rc);
65}
66
67/**
68 * @brief does pid have a gbl label
69 *
70 * @return
71 * @li 0 if no/empty label or module not loaded
72 * @li value of label
73 */
74unsigned int
75gbl_check_pid(pid_t pid)
76{
77	struct mac_grantbylabel_fetch_gbl_args gbl;
78	int rc;
79
80	rc = 0;
81	gbl.u.pid = pid;
82	if (mac_syscall(MAC_GRANTBYLABEL_NAME,
83		MAC_GRANTBYLABEL_FETCH_PID_GBL, &gbl) == 0) {
84		if (gbl.gbl != GBL_EMPTY)
85			rc = gbl.gbl;
86	}
87	return(rc);
88}
89
90
91#ifdef UNIT_TEST
92#include <stdlib.h>
93#include <stdio.h>
94#include <err.h>
95
96int
97main(int argc, char *argv[])
98{
99	pid_t pid;
100	int pflag = 0;
101	int c;
102	unsigned int gbl;
103
104	while ((c = getopt(argc, argv, "p")) != -1) {
105		switch (c) {
106		case 'p':
107			pflag = 1;
108			break;
109		default:
110			break;
111		}
112	}
113	for (; optind < argc; optind++) {
114
115		if (pflag) {
116			pid = atoi(argv[optind]);
117			gbl = gbl_check_pid(pid);
118		} else {
119			gbl = gbl_check_path(argv[optind]);
120		}
121		printf("arg=%s, gbl=%#o\n", argv[optind], gbl);
122	}
123	return 0;
124}
125#endif
126