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#include "opt_mac.h"
42
43#include <sys/param.h>
44#include <sys/kernel.h>
45#include <sys/lock.h>
46#include <sys/malloc.h>
47#include <sys/mutex.h>
48#include <sys/sbuf.h>
49#include <sys/systm.h>
50#include <sys/vnode.h>
51#include <sys/mount.h>
52#include <sys/file.h>
53#include <sys/namei.h>
54#include <sys/sdt.h>
55#include <sys/sysctl.h>
56#include <sys/sem.h>
57
58#include <security/mac/mac_framework.h>
59#include <security/mac/mac_internal.h>
60#include <security/mac/mac_policy.h>
61
62static struct label *
63mac_sysv_sem_label_alloc(void)
64{
65	struct label *label;
66
67	label = mac_labelzone_alloc(M_WAITOK);
68	MAC_POLICY_PERFORM(sysvsem_init_label, label);
69	return (label);
70}
71
72void
73mac_sysvsem_init(struct semid_kernel *semakptr)
74{
75
76	if (mac_labeled & MPC_OBJECT_SYSVSEM)
77		semakptr->label = mac_sysv_sem_label_alloc();
78	else
79		semakptr->label = NULL;
80}
81
82static void
83mac_sysv_sem_label_free(struct label *label)
84{
85
86	MAC_POLICY_PERFORM_NOSLEEP(sysvsem_destroy_label, label);
87	mac_labelzone_free(label);
88}
89
90void
91mac_sysvsem_destroy(struct semid_kernel *semakptr)
92{
93
94	if (semakptr->label != NULL) {
95		mac_sysv_sem_label_free(semakptr->label);
96		semakptr->label = NULL;
97	}
98}
99
100void
101mac_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr)
102{
103
104	MAC_POLICY_PERFORM_NOSLEEP(sysvsem_create, cred, semakptr,
105	    semakptr->label);
106}
107
108void
109mac_sysvsem_cleanup(struct semid_kernel *semakptr)
110{
111
112	MAC_POLICY_PERFORM_NOSLEEP(sysvsem_cleanup, semakptr->label);
113}
114
115MAC_CHECK_PROBE_DEFINE3(sysvsem_check_semctl, "struct ucred *",
116    "struct semid_kernel *", "int");
117
118int
119mac_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
120    int cmd)
121{
122	int error;
123
124	MAC_POLICY_CHECK_NOSLEEP(sysvsem_check_semctl, cred, semakptr,
125	    semakptr->label, cmd);
126	MAC_CHECK_PROBE3(sysvsem_check_semctl, error, cred, semakptr, cmd);
127
128	return (error);
129}
130
131MAC_CHECK_PROBE_DEFINE2(sysvsem_check_semget, "struct ucred *",
132    "struct semid_kernel *");
133
134int
135mac_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr)
136{
137	int error;
138
139	MAC_POLICY_CHECK_NOSLEEP(sysvsem_check_semget, cred, semakptr,
140	    semakptr->label);
141
142	return (error);
143}
144
145MAC_CHECK_PROBE_DEFINE3(sysvsem_check_semop, "struct ucred *",
146    "struct semid_kernel *", "size_t");
147
148int
149mac_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
150    size_t accesstype)
151{
152	int error;
153
154	MAC_POLICY_CHECK_NOSLEEP(sysvsem_check_semop, cred, semakptr,
155	    semakptr->label, accesstype);
156	MAC_CHECK_PROBE3(sysvsem_check_semop, error, cred, semakptr,
157	    accesstype);
158
159	return (error);
160}
161