1/*-
2 * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
3 * Copyright (c) 2006 SPARTA, Inc.
4 * Copyright (c) 2009 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * This software was developed for the FreeBSD Project in part by Network
8 * Associates Laboratories, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
10 * as part of the DARPA CHATS research program.
11 *
12 * This software was enhanced by SPARTA ISSO under SPAWAR contract
13 * N66001-04-C-6019 ("SEFOS").
14 *
15 * This software was developed at the University of Cambridge Computer
16 * Laboratory with support from a grant from Google, Inc.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 *    notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 *    notice, this list of conditions and the following disclaimer in the
25 *    documentation and/or other materials provided with the distribution.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD$");
42
43#include "opt_kdtrace.h"
44#include "opt_mac.h"
45
46#include <sys/param.h>
47#include <sys/kernel.h>
48#include <sys/lock.h>
49#include <sys/malloc.h>
50#include <sys/mutex.h>
51#include <sys/sbuf.h>
52#include <sys/systm.h>
53#include <sys/vnode.h>
54#include <sys/mount.h>
55#include <sys/file.h>
56#include <sys/namei.h>
57#include <sys/sdt.h>
58#include <sys/sysctl.h>
59#include <sys/sem.h>
60
61#include <security/mac/mac_framework.h>
62#include <security/mac/mac_internal.h>
63#include <security/mac/mac_policy.h>
64
65static struct label *
66mac_sysv_sem_label_alloc(void)
67{
68	struct label *label;
69
70	label = mac_labelzone_alloc(M_WAITOK);
71	MAC_POLICY_PERFORM(sysvsem_init_label, label);
72	return (label);
73}
74
75void
76mac_sysvsem_init(struct semid_kernel *semakptr)
77{
78
79	if (mac_labeled & MPC_OBJECT_SYSVSEM)
80		semakptr->label = mac_sysv_sem_label_alloc();
81	else
82		semakptr->label = NULL;
83}
84
85static void
86mac_sysv_sem_label_free(struct label *label)
87{
88
89	MAC_POLICY_PERFORM_NOSLEEP(sysvsem_destroy_label, label);
90	mac_labelzone_free(label);
91}
92
93void
94mac_sysvsem_destroy(struct semid_kernel *semakptr)
95{
96
97	if (semakptr->label != NULL) {
98		mac_sysv_sem_label_free(semakptr->label);
99		semakptr->label = NULL;
100	}
101}
102
103void
104mac_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr)
105{
106
107	MAC_POLICY_PERFORM_NOSLEEP(sysvsem_create, cred, semakptr,
108	    semakptr->label);
109}
110
111void
112mac_sysvsem_cleanup(struct semid_kernel *semakptr)
113{
114
115	MAC_POLICY_PERFORM_NOSLEEP(sysvsem_cleanup, semakptr->label);
116}
117
118MAC_CHECK_PROBE_DEFINE3(sysvsem_check_semctl, "struct ucred *",
119    "struct semid_kernel *", "int");
120
121int
122mac_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
123    int cmd)
124{
125	int error;
126
127	MAC_POLICY_CHECK_NOSLEEP(sysvsem_check_semctl, cred, semakptr,
128	    semakptr->label, cmd);
129	MAC_CHECK_PROBE3(sysvsem_check_semctl, error, cred, semakptr, cmd);
130
131	return (error);
132}
133
134MAC_CHECK_PROBE_DEFINE2(sysvsem_check_semget, "struct ucred *",
135    "struct semid_kernel *");
136
137int
138mac_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr)
139{
140	int error;
141
142	MAC_POLICY_CHECK_NOSLEEP(sysvsem_check_semget, cred, semakptr,
143	    semakptr->label);
144
145	return (error);
146}
147
148MAC_CHECK_PROBE_DEFINE3(sysvsem_check_semop, "struct ucred *",
149    "struct semid_kernel *", "size_t");
150
151int
152mac_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
153    size_t accesstype)
154{
155	int error;
156
157	MAC_POLICY_CHECK_NOSLEEP(sysvsem_check_semop, cred, semakptr,
158	    semakptr->label, accesstype);
159	MAC_CHECK_PROBE3(sysvsem_check_semop, error, cred, semakptr,
160	    accesstype);
161
162	return (error);
163}
164