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 */
46 unsigned int
gbl_check_path(const char * path)47 gbl_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 */
74 unsigned int
gbl_check_pid(pid_t pid)75 gbl_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
96 int
main(int argc,char * argv[])97 main(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