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/shm.h> 51 52 #include <sys/mac_policy.h> 53 54 #include <security/mac/mac_internal.h> 55 56 static int mac_enforce_sysv_shm = 1; 57 SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_shm, CTLFLAG_RW, 58 &mac_enforce_sysv_shm, 0, 59 "Enforce MAC policy on System V IPC shared memory"); 60 TUNABLE_INT("security.mac.enforce_sysv", &mac_enforce_sysv_shm); 61 62 #ifdef MAC_DEBUG 63 static unsigned int nmacipcshms; 64 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_shms, CTLFLAG_RD, 65 &nmacipcshms, 0, "number of sysv ipc shm identifiers inuse"); 66 #endif 67 68 static struct label * 69 mac_sysv_shm_label_alloc(void) 70 { 71 struct label *label; 72 73 label = mac_labelzone_alloc(M_WAITOK); 74 MAC_PERFORM(init_sysv_shm_label, label); 75 MAC_DEBUG_COUNTER_INC(&nmacipcshms); 76 return (label); 77 } 78 79 void 80 mac_init_sysv_shm(struct shmid_kernel *shmsegptr) 81 { 82 83 shmsegptr->label = mac_sysv_shm_label_alloc(); 84 } 85 86 static void 87 mac_sysv_shm_label_free(struct label *label) 88 { 89 90 MAC_PERFORM(destroy_sysv_shm_label, label); 91 mac_labelzone_free(label); 92 MAC_DEBUG_COUNTER_DEC(&nmacipcshms); 93 } 94 95 void 96 mac_destroy_sysv_shm(struct shmid_kernel *shmsegptr) 97 { 98 99 mac_sysv_shm_label_free(shmsegptr->label); 100 shmsegptr->label = NULL; 101 } 102 103 void 104 mac_create_sysv_shm(struct ucred *cred, struct shmid_kernel *shmsegptr) 105 { 106 107 MAC_PERFORM(create_sysv_shm, cred, shmsegptr, shmsegptr->label); 108 } 109 110 void 111 mac_cleanup_sysv_shm(struct shmid_kernel *shmsegptr) 112 { 113 114 MAC_PERFORM(cleanup_sysv_shm, shmsegptr->label); 115 } 116 117 int 118 mac_check_sysv_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 119 int shmflg) 120 { 121 int error; 122 123 if (!mac_enforce_sysv_shm) 124 return (0); 125 126 MAC_CHECK(check_sysv_shmat, cred, shmsegptr, shmsegptr->label, 127 shmflg); 128 129 return(error); 130 } 131 132 int 133 mac_check_sysv_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 134 int cmd) 135 { 136 int error; 137 138 if (!mac_enforce_sysv_shm) 139 return (0); 140 141 MAC_CHECK(check_sysv_shmctl, cred, shmsegptr, shmsegptr->label, 142 cmd); 143 144 return(error); 145 } 146 147 int 148 mac_check_sysv_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr) 149 { 150 int error; 151 152 if (!mac_enforce_sysv_shm) 153 return (0); 154 155 MAC_CHECK(check_sysv_shmdt, cred, shmsegptr, shmsegptr->label); 156 157 return(error); 158 } 159 160 int 161 mac_check_sysv_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 162 int shmflg) 163 { 164 int error; 165 166 if (!mac_enforce_sysv_shm) 167 return (0); 168 169 MAC_CHECK(check_sysv_shmget, cred, shmsegptr, shmsegptr->label, 170 shmflg); 171 172 return(error); 173 } 174