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