1 /*-
2 * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project in part by Network
6 * Associates Laboratories, the Security Research Division of Network
7 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
8 * as part of the DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include "opt_mac.h"
36
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/lock.h>
40 #include <sys/malloc.h>
41 #include <sys/mutex.h>
42 #include <sys/mac.h>
43 #include <sys/sbuf.h>
44 #include <sys/systm.h>
45 #include <sys/vnode.h>
46 #include <sys/mount.h>
47 #include <sys/file.h>
48 #include <sys/namei.h>
49 #include <sys/sysctl.h>
50 #include <sys/sem.h>
51
52 #include <sys/mac_policy.h>
53
54 #include <security/mac/mac_internal.h>
55
56 static int mac_enforce_sysv_sem = 1;
57 SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_sem, CTLFLAG_RW,
58 &mac_enforce_sysv_sem, 0, "Enforce MAC policy on System V IPC Semaphores");
59 TUNABLE_INT("security.mac.enforce_sysv", &mac_enforce_sysv_sem);
60
61 #ifdef MAC_DEBUG
62 static unsigned int nmacipcsemas;
63 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_semas, CTLFLAG_RD,
64 &nmacipcsemas, 0, "number of sysv ipc semaphore identifiers inuse");
65 #endif
66
67 static struct label *
68 mac_sysv_sem_label_alloc(void)
69 {
70 struct label *label;
71
72 label = mac_labelzone_alloc(M_WAITOK);
73 MAC_PERFORM(init_sysv_sem_label, label);
74 MAC_DEBUG_COUNTER_INC(&nmacipcsemas);
75 return (label);
76 }
77
78 void
79 mac_init_sysv_sem(struct semid_kernel *semakptr)
80 {
81
82 semakptr->label = mac_sysv_sem_label_alloc();
83 }
84
85 static void
86 mac_sysv_sem_label_free(struct label *label)
87 {
88
89 MAC_PERFORM(destroy_sysv_sem_label, label);
90 mac_labelzone_free(label);
91 MAC_DEBUG_COUNTER_DEC(&nmacipcsemas);
92 }
93
94 void
95 mac_destroy_sysv_sem(struct semid_kernel *semakptr)
96 {
97
98 mac_sysv_sem_label_free(semakptr->label);
99 semakptr->label = NULL;
100 }
101
102 void
103 mac_create_sysv_sem(struct ucred *cred, struct semid_kernel *semakptr)
104 {
105
106 MAC_PERFORM(create_sysv_sem, cred, semakptr, semakptr->label);
107 }
108
109 void
110 mac_cleanup_sysv_sem(struct semid_kernel *semakptr)
111 {
112
113 MAC_PERFORM(cleanup_sysv_sem, semakptr->label);
114 }
115
116 int
117 mac_check_sysv_semctl(struct ucred *cred, struct semid_kernel *semakptr,
118 int cmd)
119 {
120 int error;
121
122 if (!mac_enforce_sysv_sem)
123 return (0);
124
125 MAC_CHECK(check_sysv_semctl, cred, semakptr, semakptr->label, cmd);
126
127 return(error);
128 }
129
130 int
131 mac_check_sysv_semget(struct ucred *cred, struct semid_kernel *semakptr)
132 {
133 int error;
134
135 if (!mac_enforce_sysv_sem)
136 return (0);
137
138 MAC_CHECK(check_sysv_semget, cred, semakptr, semakptr->label);
139
140 return(error);
141 }
142
143 int
144 mac_check_sysv_semop(struct ucred *cred, struct semid_kernel *semakptr,
145 size_t accesstype)
146 {
147 int error;
148
149 if (!mac_enforce_sysv_sem)
150 return (0);
151
152 MAC_CHECK(check_sysv_semop, cred, semakptr, semakptr->label,
153 accesstype);
154
155 return(error);
156 }
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