1 /*- 2 * Copyright (c) 2002, 2003 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/module.h> 42 #include <sys/mutex.h> 43 #include <sys/mac.h> 44 #include <sys/systm.h> 45 #include <sys/vnode.h> 46 #include <sys/sysctl.h> 47 48 #include <sys/mac_policy.h> 49 50 #include <security/mac/mac_framework.h> 51 #include <security/mac/mac_internal.h> 52 53 static int mac_enforce_kld = 1; 54 SYSCTL_INT(_security_mac, OID_AUTO, enforce_kld, CTLFLAG_RW, 55 &mac_enforce_kld, 0, "Enforce MAC policy on kld operations"); 56 TUNABLE_INT("security.mac.enforce_kld", &mac_enforce_kld); 57 58 static int mac_enforce_system = 1; 59 SYSCTL_INT(_security_mac, OID_AUTO, enforce_system, CTLFLAG_RW, 60 &mac_enforce_system, 0, "Enforce MAC policy on system operations"); 61 TUNABLE_INT("security.mac.enforce_system", &mac_enforce_system); 62 63 int 64 mac_check_kenv_dump(struct ucred *cred) 65 { 66 int error; 67 68 if (!mac_enforce_system) 69 return (0); 70 71 MAC_CHECK(check_kenv_dump, cred); 72 73 return (error); 74 } 75 76 int 77 mac_check_kenv_get(struct ucred *cred, char *name) 78 { 79 int error; 80 81 if (!mac_enforce_system) 82 return (0); 83 84 MAC_CHECK(check_kenv_get, cred, name); 85 86 return (error); 87 } 88 89 int 90 mac_check_kenv_set(struct ucred *cred, char *name, char *value) 91 { 92 int error; 93 94 if (!mac_enforce_system) 95 return (0); 96 97 MAC_CHECK(check_kenv_set, cred, name, value); 98 99 return (error); 100 } 101 102 int 103 mac_check_kenv_unset(struct ucred *cred, char *name) 104 { 105 int error; 106 107 if (!mac_enforce_system) 108 return (0); 109 110 MAC_CHECK(check_kenv_unset, cred, name); 111 112 return (error); 113 } 114 115 int 116 mac_check_kld_load(struct ucred *cred, struct vnode *vp) 117 { 118 int error; 119 120 ASSERT_VOP_LOCKED(vp, "mac_check_kld_load"); 121 122 if (!mac_enforce_kld) 123 return (0); 124 125 MAC_CHECK(check_kld_load, cred, vp, vp->v_label); 126 127 return (error); 128 } 129 130 int 131 mac_check_kld_stat(struct ucred *cred) 132 { 133 int error; 134 135 if (!mac_enforce_kld) 136 return (0); 137 138 MAC_CHECK(check_kld_stat, cred); 139 140 return (error); 141 } 142 143 int 144 mac_check_kld_unload(struct ucred *cred) 145 { 146 int error; 147 148 if (!mac_enforce_kld) 149 return (0); 150 151 MAC_CHECK(check_kld_unload, cred); 152 153 return (error); 154 } 155 156 int 157 mac_check_sysarch_ioperm(struct ucred *cred) 158 { 159 int error; 160 161 if (!mac_enforce_system) 162 return (0); 163 164 MAC_CHECK(check_sysarch_ioperm, cred); 165 return (error); 166 } 167 168 int 169 mac_check_system_acct(struct ucred *cred, struct vnode *vp) 170 { 171 int error; 172 173 if (vp != NULL) { 174 ASSERT_VOP_LOCKED(vp, "mac_check_system_acct"); 175 } 176 177 if (!mac_enforce_system) 178 return (0); 179 180 MAC_CHECK(check_system_acct, cred, vp, 181 vp != NULL ? vp->v_label : NULL); 182 183 return (error); 184 } 185 186 int 187 mac_check_system_nfsd(struct ucred *cred) 188 { 189 int error; 190 191 if (!mac_enforce_system) 192 return (0); 193 194 MAC_CHECK(check_system_nfsd, cred); 195 196 return (error); 197 } 198 199 int 200 mac_check_system_reboot(struct ucred *cred, int howto) 201 { 202 int error; 203 204 if (!mac_enforce_system) 205 return (0); 206 207 MAC_CHECK(check_system_reboot, cred, howto); 208 209 return (error); 210 } 211 212 int 213 mac_check_system_settime(struct ucred *cred) 214 { 215 int error; 216 217 if (!mac_enforce_system) 218 return (0); 219 220 MAC_CHECK(check_system_settime, cred); 221 222 return (error); 223 } 224 225 int 226 mac_check_system_swapon(struct ucred *cred, struct vnode *vp) 227 { 228 int error; 229 230 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapon"); 231 232 if (!mac_enforce_system) 233 return (0); 234 235 MAC_CHECK(check_system_swapon, cred, vp, vp->v_label); 236 return (error); 237 } 238 239 int 240 mac_check_system_swapoff(struct ucred *cred, struct vnode *vp) 241 { 242 int error; 243 244 ASSERT_VOP_LOCKED(vp, "mac_check_system_swapoff"); 245 246 if (!mac_enforce_system) 247 return (0); 248 249 MAC_CHECK(check_system_swapoff, cred, vp, vp->v_label); 250 return (error); 251 } 252 253 int 254 mac_check_system_sysctl(struct ucred *cred, struct sysctl_oid *oidp, void *arg1, 255 int arg2, struct sysctl_req *req) 256 { 257 int error; 258 259 /* 260 * XXXMAC: We would very much like to assert the SYSCTL_LOCK here, 261 * but since it's not exported from kern_sysctl.c, we can't. 262 */ 263 if (!mac_enforce_system) 264 return (0); 265 266 MAC_CHECK(check_system_sysctl, cred, oidp, arg1, arg2, req); 267 268 return (error); 269 } 270