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 static struct label * 62 mac_sysv_sem_label_alloc(void) 63 { 64 struct label *label; 65 66 label = mac_labelzone_alloc(M_WAITOK); 67 MAC_PERFORM(init_sysv_sem_label, label); 68 return (label); 69 } 70 71 void 72 mac_init_sysv_sem(struct semid_kernel *semakptr) 73 { 74 75 semakptr->label = mac_sysv_sem_label_alloc(); 76 } 77 78 static void 79 mac_sysv_sem_label_free(struct label *label) 80 { 81 82 MAC_PERFORM(destroy_sysv_sem_label, label); 83 mac_labelzone_free(label); 84 } 85 86 void 87 mac_destroy_sysv_sem(struct semid_kernel *semakptr) 88 { 89 90 mac_sysv_sem_label_free(semakptr->label); 91 semakptr->label = NULL; 92 } 93 94 void 95 mac_create_sysv_sem(struct ucred *cred, struct semid_kernel *semakptr) 96 { 97 98 MAC_PERFORM(create_sysv_sem, cred, semakptr, semakptr->label); 99 } 100 101 void 102 mac_cleanup_sysv_sem(struct semid_kernel *semakptr) 103 { 104 105 MAC_PERFORM(cleanup_sysv_sem, semakptr->label); 106 } 107 108 int 109 mac_check_sysv_semctl(struct ucred *cred, struct semid_kernel *semakptr, 110 int cmd) 111 { 112 int error; 113 114 if (!mac_enforce_sysv_sem) 115 return (0); 116 117 MAC_CHECK(check_sysv_semctl, cred, semakptr, semakptr->label, cmd); 118 119 return(error); 120 } 121 122 int 123 mac_check_sysv_semget(struct ucred *cred, struct semid_kernel *semakptr) 124 { 125 int error; 126 127 if (!mac_enforce_sysv_sem) 128 return (0); 129 130 MAC_CHECK(check_sysv_semget, cred, semakptr, semakptr->label); 131 132 return(error); 133 } 134 135 int 136 mac_check_sysv_semop(struct ucred *cred, struct semid_kernel *semakptr, 137 size_t accesstype) 138 { 139 int error; 140 141 if (!mac_enforce_sysv_sem) 142 return (0); 143 144 MAC_CHECK(check_sysv_semop, cred, semakptr, semakptr->label, 145 accesstype); 146 147 return(error); 148 } 149