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_kdtrace.h" 57 #include "opt_mac.h" 58 59 #include <sys/param.h> 60 #include <sys/kernel.h> 61 #include <sys/lock.h> 62 #include <sys/malloc.h> 63 #include <sys/module.h> 64 #include <sys/mutex.h> 65 #include <sys/sdt.h> 66 #include <sys/systm.h> 67 #include <sys/vnode.h> 68 #include <sys/sysctl.h> 69 70 #include <security/mac/mac_framework.h> 71 #include <security/mac/mac_internal.h> 72 #include <security/mac/mac_policy.h> 73 74 MAC_CHECK_PROBE_DEFINE1(kenv_check_dump, "struct ucred *"); 75 76 int 77 mac_kenv_check_dump(struct ucred *cred) 78 { 79 int error; 80 81 MAC_POLICY_CHECK_NOSLEEP(kenv_check_dump, cred); 82 MAC_CHECK_PROBE1(kenv_check_dump, error, cred); 83 84 return (error); 85 } 86 87 MAC_CHECK_PROBE_DEFINE2(kenv_check_get, "struct ucred *", "char *"); 88 89 int 90 mac_kenv_check_get(struct ucred *cred, char *name) 91 { 92 int error; 93 94 MAC_POLICY_CHECK_NOSLEEP(kenv_check_get, cred, name); 95 MAC_CHECK_PROBE2(kenv_check_get, error, cred, name); 96 97 return (error); 98 } 99 100 MAC_CHECK_PROBE_DEFINE3(kenv_check_set, "struct ucred *", "char *", 101 "char *"); 102 103 int 104 mac_kenv_check_set(struct ucred *cred, char *name, char *value) 105 { 106 int error; 107 108 MAC_POLICY_CHECK_NOSLEEP(kenv_check_set, cred, name, value); 109 MAC_CHECK_PROBE3(kenv_check_set, error, cred, name, value); 110 111 return (error); 112 } 113 114 MAC_CHECK_PROBE_DEFINE2(kenv_check_unset, "struct ucred *", "char *"); 115 116 int 117 mac_kenv_check_unset(struct ucred *cred, char *name) 118 { 119 int error; 120 121 MAC_POLICY_CHECK_NOSLEEP(kenv_check_unset, cred, name); 122 MAC_CHECK_PROBE2(kenv_check_unset, error, cred, name); 123 124 return (error); 125 } 126 127 MAC_CHECK_PROBE_DEFINE2(kld_check_load, "struct ucred *", "struct vnode *"); 128 129 int 130 mac_kld_check_load(struct ucred *cred, struct vnode *vp) 131 { 132 int error; 133 134 ASSERT_VOP_LOCKED(vp, "mac_kld_check_load"); 135 136 MAC_POLICY_CHECK(kld_check_load, cred, vp, vp->v_label); 137 MAC_CHECK_PROBE2(kld_check_load, error, cred, vp); 138 139 return (error); 140 } 141 142 MAC_CHECK_PROBE_DEFINE1(kld_check_stat, "struct ucred *"); 143 144 int 145 mac_kld_check_stat(struct ucred *cred) 146 { 147 int error; 148 149 MAC_POLICY_CHECK_NOSLEEP(kld_check_stat, cred); 150 MAC_CHECK_PROBE1(kld_check_stat, error, cred); 151 152 return (error); 153 } 154 155 MAC_CHECK_PROBE_DEFINE2(system_check_acct, "struct ucred *", 156 "struct vnode *"); 157 158 int 159 mac_system_check_acct(struct ucred *cred, struct vnode *vp) 160 { 161 int error; 162 163 if (vp != NULL) { 164 ASSERT_VOP_LOCKED(vp, "mac_system_check_acct"); 165 } 166 167 MAC_POLICY_CHECK(system_check_acct, cred, vp, 168 vp != NULL ? vp->v_label : NULL); 169 MAC_CHECK_PROBE2(system_check_acct, error, cred, vp); 170 171 return (error); 172 } 173 174 MAC_CHECK_PROBE_DEFINE2(system_check_reboot, "struct ucred *", "int"); 175 176 int 177 mac_system_check_reboot(struct ucred *cred, int howto) 178 { 179 int error; 180 181 MAC_POLICY_CHECK_NOSLEEP(system_check_reboot, cred, howto); 182 MAC_CHECK_PROBE2(system_check_reboot, error, cred, howto); 183 184 return (error); 185 } 186 187 MAC_CHECK_PROBE_DEFINE2(system_check_swapon, "struct ucred *", 188 "struct vnode *"); 189 190 int 191 mac_system_check_swapon(struct ucred *cred, struct vnode *vp) 192 { 193 int error; 194 195 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapon"); 196 197 MAC_POLICY_CHECK(system_check_swapon, cred, vp, vp->v_label); 198 MAC_CHECK_PROBE2(system_check_swapon, error, cred, vp); 199 200 return (error); 201 } 202 203 MAC_CHECK_PROBE_DEFINE2(system_check_swapoff, "struct ucred *", 204 "struct vnode *"); 205 206 int 207 mac_system_check_swapoff(struct ucred *cred, struct vnode *vp) 208 { 209 int error; 210 211 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapoff"); 212 213 MAC_POLICY_CHECK(system_check_swapoff, cred, vp, vp->v_label); 214 MAC_CHECK_PROBE2(system_check_swapoff, error, cred, vp); 215 216 return (error); 217 } 218 219 MAC_CHECK_PROBE_DEFINE3(system_check_sysctl, "struct ucred *", 220 "struct sysctl_oid *", "struct sysctl_req *"); 221 222 int 223 mac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 224 void *arg1, int arg2, struct sysctl_req *req) 225 { 226 int error; 227 228 /* 229 * XXXMAC: We would very much like to assert the SYSCTL_LOCK here, 230 * but since it's not exported from kern_sysctl.c, we can't. 231 */ 232 MAC_POLICY_CHECK_NOSLEEP(system_check_sysctl, cred, oidp, arg1, arg2, 233 req); 234 MAC_CHECK_PROBE3(system_check_sysctl, error, cred, oidp, req); 235 236 return (error); 237 } 238