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/msg.h> 51 52 #include <sys/mac_policy.h> 53 54 #include <security/mac/mac_framework.h> 55 #include <security/mac/mac_internal.h> 56 57 static int mac_enforce_sysv_msg = 1; 58 SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_msg, CTLFLAG_RW, 59 &mac_enforce_sysv_msg, 0, 60 "Enforce MAC policy on System V IPC Message Queues"); 61 TUNABLE_INT("security.mac.enforce_sysv_msg", &mac_enforce_sysv_msg); 62 63 static struct label * 64 mac_sysv_msgmsg_label_alloc(void) 65 { 66 struct label *label; 67 68 label = mac_labelzone_alloc(M_WAITOK); 69 MAC_PERFORM(init_sysv_msgmsg_label, label); 70 return (label); 71 } 72 73 void 74 mac_init_sysv_msgmsg(struct msg *msgptr) 75 { 76 77 msgptr->label = mac_sysv_msgmsg_label_alloc(); 78 } 79 80 static struct label * 81 mac_sysv_msgqueue_label_alloc(void) 82 { 83 struct label *label; 84 85 label = mac_labelzone_alloc(M_WAITOK); 86 MAC_PERFORM(init_sysv_msgqueue_label, label); 87 return (label); 88 } 89 90 void 91 mac_init_sysv_msgqueue(struct msqid_kernel *msqkptr) 92 { 93 94 msqkptr->label = mac_sysv_msgqueue_label_alloc(); 95 } 96 97 static void 98 mac_sysv_msgmsg_label_free(struct label *label) 99 { 100 101 MAC_PERFORM(destroy_sysv_msgmsg_label, label); 102 mac_labelzone_free(label); 103 } 104 105 void 106 mac_destroy_sysv_msgmsg(struct msg *msgptr) 107 { 108 109 mac_sysv_msgmsg_label_free(msgptr->label); 110 msgptr->label = NULL; 111 } 112 113 static void 114 mac_sysv_msgqueue_label_free(struct label *label) 115 { 116 117 MAC_PERFORM(destroy_sysv_msgqueue_label, label); 118 mac_labelzone_free(label); 119 } 120 121 void 122 mac_destroy_sysv_msgqueue(struct msqid_kernel *msqkptr) 123 { 124 125 mac_sysv_msgqueue_label_free(msqkptr->label); 126 msqkptr->label = NULL; 127 } 128 129 void 130 mac_create_sysv_msgmsg(struct ucred *cred, struct msqid_kernel *msqkptr, 131 struct msg *msgptr) 132 { 133 134 MAC_PERFORM(create_sysv_msgmsg, cred, msqkptr, msqkptr->label, 135 msgptr, msgptr->label); 136 } 137 138 void 139 mac_create_sysv_msgqueue(struct ucred *cred, struct msqid_kernel *msqkptr) 140 { 141 142 MAC_PERFORM(create_sysv_msgqueue, cred, msqkptr, msqkptr->label); 143 } 144 145 void 146 mac_cleanup_sysv_msgmsg(struct msg *msgptr) 147 { 148 149 MAC_PERFORM(cleanup_sysv_msgmsg, msgptr->label); 150 } 151 152 void 153 mac_cleanup_sysv_msgqueue(struct msqid_kernel *msqkptr) 154 { 155 156 MAC_PERFORM(cleanup_sysv_msgqueue, msqkptr->label); 157 } 158 159 int 160 mac_check_sysv_msgmsq(struct ucred *cred, struct msg *msgptr, 161 struct msqid_kernel *msqkptr) 162 { 163 int error; 164 165 if (!mac_enforce_sysv_msg) 166 return (0); 167 168 MAC_CHECK(check_sysv_msgmsq, cred, msgptr, msgptr->label, msqkptr, 169 msqkptr->label); 170 171 return(error); 172 } 173 174 int 175 mac_check_sysv_msgrcv(struct ucred *cred, struct msg *msgptr) 176 { 177 int error; 178 179 if (!mac_enforce_sysv_msg) 180 return (0); 181 182 MAC_CHECK(check_sysv_msgrcv, cred, msgptr, msgptr->label); 183 184 return(error); 185 } 186 187 int 188 mac_check_sysv_msgrmid(struct ucred *cred, struct msg *msgptr) 189 { 190 int error; 191 192 if (!mac_enforce_sysv_msg) 193 return (0); 194 195 MAC_CHECK(check_sysv_msgrmid, cred, msgptr, msgptr->label); 196 197 return(error); 198 } 199 200 int 201 mac_check_sysv_msqget(struct ucred *cred, struct msqid_kernel *msqkptr) 202 { 203 int error; 204 205 if (!mac_enforce_sysv_msg) 206 return (0); 207 208 MAC_CHECK(check_sysv_msqget, cred, msqkptr, msqkptr->label); 209 210 return(error); 211 } 212 213 int 214 mac_check_sysv_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr) 215 { 216 int error; 217 218 if (!mac_enforce_sysv_msg) 219 return (0); 220 221 MAC_CHECK(check_sysv_msqsnd, cred, msqkptr, msqkptr->label); 222 223 return(error); 224 } 225 226 int 227 mac_check_sysv_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr) 228 { 229 int error; 230 231 if (!mac_enforce_sysv_msg) 232 return (0); 233 234 MAC_CHECK(check_sysv_msqrcv, cred, msqkptr, msqkptr->label); 235 236 return(error); 237 } 238 239 int 240 mac_check_sysv_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 241 int cmd) 242 { 243 int error; 244 245 if (!mac_enforce_sysv_msg) 246 return (0); 247 248 MAC_CHECK(check_sysv_msqctl, cred, msqkptr, msqkptr->label, cmd); 249 250 return(error); 251 } 252