1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2006 SPARTA, Inc. 4 * Copyright (c) 2007, 2009 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * This software was developed for the FreeBSD Project in part by Network 8 * Associates Laboratories, the Security Research Division of Network 9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 10 * as part of the DARPA CHATS research program. 11 * 12 * Portions of this software were developed by Robert Watson for the 13 * TrustedBSD Project. 14 * 15 * This software was enhanced by SPARTA ISSO under SPAWAR contract 16 * N66001-04-C-6019 ("SEFOS"). 17 * 18 * This software was developed at the University of Cambridge Computer 19 * Laboratory with support from a grant from Google, Inc. 20 * 21 * Redistribution and use in source and binary forms, with or without 22 * modification, are permitted provided that the following conditions 23 * are met: 24 * 1. Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * 2. Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in the 28 * documentation and/or other materials provided with the distribution. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 */ 42 43 /* 44 * MAC Framework entry points relating to overall operation of system, 45 * including global services such as the kernel environment and loadable 46 * modules. 47 * 48 * System checks often align with existing privilege checks, but provide 49 * additional security context that may be relevant to policies, such as the 50 * specific object being operated on. 51 */ 52 53 #include <sys/cdefs.h> 54 __FBSDID("$FreeBSD$"); 55 56 #include "opt_mac.h" 57 58 #include <sys/param.h> 59 #include <sys/kernel.h> 60 #include <sys/lock.h> 61 #include <sys/malloc.h> 62 #include <sys/module.h> 63 #include <sys/mutex.h> 64 #include <sys/sdt.h> 65 #include <sys/systm.h> 66 #include <sys/vnode.h> 67 #include <sys/sysctl.h> 68 69 #include <security/mac/mac_framework.h> 70 #include <security/mac/mac_internal.h> 71 #include <security/mac/mac_policy.h> 72 73 MAC_CHECK_PROBE_DEFINE1(kenv_check_dump, "struct ucred *"); 74 75 int 76 mac_kenv_check_dump(struct ucred *cred) 77 { 78 int error; 79 80 MAC_POLICY_CHECK_NOSLEEP(kenv_check_dump, cred); 81 MAC_CHECK_PROBE1(kenv_check_dump, error, cred); 82 83 return (error); 84 } 85 86 MAC_CHECK_PROBE_DEFINE2(kenv_check_get, "struct ucred *", "char *"); 87 88 int 89 mac_kenv_check_get(struct ucred *cred, char *name) 90 { 91 int error; 92 93 MAC_POLICY_CHECK_NOSLEEP(kenv_check_get, cred, name); 94 MAC_CHECK_PROBE2(kenv_check_get, error, cred, name); 95 96 return (error); 97 } 98 99 MAC_CHECK_PROBE_DEFINE3(kenv_check_set, "struct ucred *", "char *", 100 "char *"); 101 102 int 103 mac_kenv_check_set(struct ucred *cred, char *name, char *value) 104 { 105 int error; 106 107 MAC_POLICY_CHECK_NOSLEEP(kenv_check_set, cred, name, value); 108 MAC_CHECK_PROBE3(kenv_check_set, error, cred, name, value); 109 110 return (error); 111 } 112 113 MAC_CHECK_PROBE_DEFINE2(kenv_check_unset, "struct ucred *", "char *"); 114 115 int 116 mac_kenv_check_unset(struct ucred *cred, char *name) 117 { 118 int error; 119 120 MAC_POLICY_CHECK_NOSLEEP(kenv_check_unset, cred, name); 121 MAC_CHECK_PROBE2(kenv_check_unset, error, cred, name); 122 123 return (error); 124 } 125 126 MAC_CHECK_PROBE_DEFINE2(kld_check_load, "struct ucred *", "struct vnode *"); 127 128 int 129 mac_kld_check_load(struct ucred *cred, struct vnode *vp) 130 { 131 int error; 132 133 ASSERT_VOP_LOCKED(vp, "mac_kld_check_load"); 134 135 MAC_POLICY_CHECK(kld_check_load, cred, vp, vp->v_label); 136 MAC_CHECK_PROBE2(kld_check_load, error, cred, vp); 137 138 return (error); 139 } 140 141 MAC_CHECK_PROBE_DEFINE1(kld_check_stat, "struct ucred *"); 142 143 int 144 mac_kld_check_stat(struct ucred *cred) 145 { 146 int error; 147 148 MAC_POLICY_CHECK_NOSLEEP(kld_check_stat, cred); 149 MAC_CHECK_PROBE1(kld_check_stat, error, cred); 150 151 return (error); 152 } 153 154 MAC_CHECK_PROBE_DEFINE2(system_check_acct, "struct ucred *", 155 "struct vnode *"); 156 157 int 158 mac_system_check_acct(struct ucred *cred, struct vnode *vp) 159 { 160 int error; 161 162 if (vp != NULL) { 163 ASSERT_VOP_LOCKED(vp, "mac_system_check_acct"); 164 } 165 166 MAC_POLICY_CHECK(system_check_acct, cred, vp, 167 vp != NULL ? vp->v_label : NULL); 168 MAC_CHECK_PROBE2(system_check_acct, error, cred, vp); 169 170 return (error); 171 } 172 173 MAC_CHECK_PROBE_DEFINE2(system_check_reboot, "struct ucred *", "int"); 174 175 int 176 mac_system_check_reboot(struct ucred *cred, int howto) 177 { 178 int error; 179 180 MAC_POLICY_CHECK_NOSLEEP(system_check_reboot, cred, howto); 181 MAC_CHECK_PROBE2(system_check_reboot, error, cred, howto); 182 183 return (error); 184 } 185 186 MAC_CHECK_PROBE_DEFINE2(system_check_swapon, "struct ucred *", 187 "struct vnode *"); 188 189 int 190 mac_system_check_swapon(struct ucred *cred, struct vnode *vp) 191 { 192 int error; 193 194 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapon"); 195 196 MAC_POLICY_CHECK(system_check_swapon, cred, vp, vp->v_label); 197 MAC_CHECK_PROBE2(system_check_swapon, error, cred, vp); 198 199 return (error); 200 } 201 202 MAC_CHECK_PROBE_DEFINE2(system_check_swapoff, "struct ucred *", 203 "struct vnode *"); 204 205 int 206 mac_system_check_swapoff(struct ucred *cred, struct vnode *vp) 207 { 208 int error; 209 210 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapoff"); 211 212 MAC_POLICY_CHECK(system_check_swapoff, cred, vp, vp->v_label); 213 MAC_CHECK_PROBE2(system_check_swapoff, error, cred, vp); 214 215 return (error); 216 } 217 218 MAC_CHECK_PROBE_DEFINE3(system_check_sysctl, "struct ucred *", 219 "struct sysctl_oid *", "struct sysctl_req *"); 220 221 int 222 mac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 223 void *arg1, int arg2, struct sysctl_req *req) 224 { 225 int error; 226 227 /* 228 * XXXMAC: We would very much like to assert the SYSCTL_LOCK here, 229 * but since it's not exported from kern_sysctl.c, we can't. 230 */ 231 MAC_POLICY_CHECK_NOSLEEP(system_check_sysctl, cred, oidp, arg1, arg2, 232 req); 233 MAC_CHECK_PROBE3(system_check_sysctl, error, cred, oidp, req); 234 235 return (error); 236 } 237