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 #ifdef MAC_DEBUG 63 static unsigned int nmacipcmsgs, nmacipcmsqs; 64 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_msgs, CTLFLAG_RD, 65 &nmacipcmsgs, 0, "number of sysv ipc messages inuse"); 66 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_msqs, CTLFLAG_RD, 67 &nmacipcmsqs, 0, "number of sysv ipc message queue identifiers inuse"); 68 #endif 69 70 static struct label * 71 mac_sysv_msgmsg_label_alloc(void) 72 { 73 struct label *label; 74 75 label = mac_labelzone_alloc(M_WAITOK); 76 MAC_PERFORM(init_sysv_msgmsg_label, label); 77 MAC_DEBUG_COUNTER_INC(&nmacipcmsgs); 78 return (label); 79 } 80 81 void 82 mac_init_sysv_msgmsg(struct msg *msgptr) 83 { 84 85 msgptr->label = mac_sysv_msgmsg_label_alloc(); 86 } 87 88 static struct label * 89 mac_sysv_msgqueue_label_alloc(void) 90 { 91 struct label *label; 92 93 label = mac_labelzone_alloc(M_WAITOK); 94 MAC_PERFORM(init_sysv_msgqueue_label, label); 95 MAC_DEBUG_COUNTER_INC(&nmacipcmsqs); 96 return (label); 97 } 98 99 void 100 mac_init_sysv_msgqueue(struct msqid_kernel *msqkptr) 101 { 102 103 msqkptr->label = mac_sysv_msgqueue_label_alloc(); 104 msqkptr->label = NULL; 105 } 106 107 static void 108 mac_sysv_msgmsg_label_free(struct label *label) 109 { 110 111 MAC_PERFORM(destroy_sysv_msgmsg_label, label); 112 mac_labelzone_free(label); 113 MAC_DEBUG_COUNTER_DEC(&nmacipcmsgs); 114 } 115 116 void 117 mac_destroy_sysv_msgmsg(struct msg *msgptr) 118 { 119 120 mac_sysv_msgmsg_label_free(msgptr->label); 121 msgptr->label = NULL; 122 } 123 124 static void 125 mac_sysv_msgqueue_label_free(struct label *label) 126 { 127 128 MAC_PERFORM(destroy_sysv_msgqueue_label, label); 129 mac_labelzone_free(label); 130 MAC_DEBUG_COUNTER_DEC(&nmacipcmsqs); 131 } 132 133 void 134 mac_destroy_sysv_msgqueue(struct msqid_kernel *msqkptr) 135 { 136 137 mac_sysv_msgqueue_label_free(msqkptr->label); 138 msqkptr->label = NULL; 139 } 140 141 void 142 mac_create_sysv_msgmsg(struct ucred *cred, struct msqid_kernel *msqkptr, 143 struct msg *msgptr) 144 { 145 146 MAC_PERFORM(create_sysv_msgmsg, cred, msqkptr, msqkptr->label, 147 msgptr, msgptr->label); 148 } 149 150 void 151 mac_create_sysv_msgqueue(struct ucred *cred, struct msqid_kernel *msqkptr) 152 { 153 154 MAC_PERFORM(create_sysv_msgqueue, cred, msqkptr, msqkptr->label); 155 } 156 157 void 158 mac_cleanup_sysv_msgmsg(struct msg *msgptr) 159 { 160 161 MAC_PERFORM(cleanup_sysv_msgmsg, msgptr->label); 162 } 163 164 void 165 mac_cleanup_sysv_msgqueue(struct msqid_kernel *msqkptr) 166 { 167 168 MAC_PERFORM(cleanup_sysv_msgqueue, msqkptr->label); 169 } 170 171 int 172 mac_check_sysv_msgmsq(struct ucred *cred, struct msg *msgptr, 173 struct msqid_kernel *msqkptr) 174 { 175 int error; 176 177 if (!mac_enforce_sysv_msg) 178 return (0); 179 180 MAC_CHECK(check_sysv_msgmsq, cred, msgptr, msgptr->label, msqkptr, 181 msqkptr->label); 182 183 return(error); 184 } 185 186 int 187 mac_check_sysv_msgrcv(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_msgrcv, cred, msgptr, msgptr->label); 195 196 return(error); 197 } 198 199 int 200 mac_check_sysv_msgrmid(struct ucred *cred, struct msg *msgptr) 201 { 202 int error; 203 204 if (!mac_enforce_sysv_msg) 205 return (0); 206 207 MAC_CHECK(check_sysv_msgrmid, cred, msgptr, msgptr->label); 208 209 return(error); 210 } 211 212 int 213 mac_check_sysv_msqget(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_msqget, cred, msqkptr, msqkptr->label); 221 222 return(error); 223 } 224 225 int 226 mac_check_sysv_msqsnd(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_msqsnd, cred, msqkptr, msqkptr->label); 234 235 return(error); 236 } 237 238 int 239 mac_check_sysv_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr) 240 { 241 int error; 242 243 if (!mac_enforce_sysv_msg) 244 return (0); 245 246 MAC_CHECK(check_sysv_msqrcv, cred, msqkptr, msqkptr->label); 247 248 return(error); 249 } 250 251 int 252 mac_check_sysv_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, 253 int cmd) 254 { 255 int error; 256 257 if (!mac_enforce_sysv_msg) 258 return (0); 259 260 MAC_CHECK(check_sysv_msqctl, cred, msqkptr, msqkptr->label, cmd); 261 262 return(error); 263 } 264