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 #include "opt_mac.h" 55 56 #include <sys/param.h> 57 #include <sys/kernel.h> 58 #include <sys/lock.h> 59 #include <sys/malloc.h> 60 #include <sys/module.h> 61 #include <sys/mutex.h> 62 #include <sys/sdt.h> 63 #include <sys/systm.h> 64 #include <sys/vnode.h> 65 #include <sys/sysctl.h> 66 67 #include <security/mac/mac_framework.h> 68 #include <security/mac/mac_internal.h> 69 #include <security/mac/mac_policy.h> 70 71 MAC_CHECK_PROBE_DEFINE1(kenv_check_dump, "struct ucred *"); 72 73 int 74 mac_kenv_check_dump(struct ucred *cred) 75 { 76 int error; 77 78 MAC_POLICY_CHECK_NOSLEEP(kenv_check_dump, cred); 79 MAC_CHECK_PROBE1(kenv_check_dump, error, cred); 80 81 return (error); 82 } 83 84 MAC_CHECK_PROBE_DEFINE2(kenv_check_get, "struct ucred *", "char *"); 85 86 int 87 mac_kenv_check_get(struct ucred *cred, char *name) 88 { 89 int error; 90 91 MAC_POLICY_CHECK_NOSLEEP(kenv_check_get, cred, name); 92 MAC_CHECK_PROBE2(kenv_check_get, error, cred, name); 93 94 return (error); 95 } 96 97 MAC_CHECK_PROBE_DEFINE3(kenv_check_set, "struct ucred *", "char *", 98 "char *"); 99 100 int 101 mac_kenv_check_set(struct ucred *cred, char *name, char *value) 102 { 103 int error; 104 105 MAC_POLICY_CHECK_NOSLEEP(kenv_check_set, cred, name, value); 106 MAC_CHECK_PROBE3(kenv_check_set, error, cred, name, value); 107 108 return (error); 109 } 110 111 MAC_CHECK_PROBE_DEFINE2(kenv_check_unset, "struct ucred *", "char *"); 112 113 int 114 mac_kenv_check_unset(struct ucred *cred, char *name) 115 { 116 int error; 117 118 MAC_POLICY_CHECK_NOSLEEP(kenv_check_unset, cred, name); 119 MAC_CHECK_PROBE2(kenv_check_unset, error, cred, name); 120 121 return (error); 122 } 123 124 MAC_CHECK_PROBE_DEFINE2(kld_check_load, "struct ucred *", "struct vnode *"); 125 126 int 127 mac_kld_check_load(struct ucred *cred, struct vnode *vp) 128 { 129 int error; 130 131 ASSERT_VOP_LOCKED(vp, "mac_kld_check_load"); 132 133 MAC_POLICY_CHECK(kld_check_load, cred, vp, vp->v_label); 134 MAC_CHECK_PROBE2(kld_check_load, error, cred, vp); 135 136 return (error); 137 } 138 139 MAC_CHECK_PROBE_DEFINE1(kld_check_stat, "struct ucred *"); 140 141 int 142 mac_kld_check_stat(struct ucred *cred) 143 { 144 int error; 145 146 MAC_POLICY_CHECK_NOSLEEP(kld_check_stat, cred); 147 MAC_CHECK_PROBE1(kld_check_stat, error, cred); 148 149 return (error); 150 } 151 152 MAC_CHECK_PROBE_DEFINE2(system_check_acct, "struct ucred *", 153 "struct vnode *"); 154 155 int 156 mac_system_check_acct(struct ucred *cred, struct vnode *vp) 157 { 158 int error; 159 160 if (vp != NULL) { 161 ASSERT_VOP_LOCKED(vp, "mac_system_check_acct"); 162 } 163 164 MAC_POLICY_CHECK(system_check_acct, cred, vp, 165 vp != NULL ? vp->v_label : NULL); 166 MAC_CHECK_PROBE2(system_check_acct, error, cred, vp); 167 168 return (error); 169 } 170 171 MAC_CHECK_PROBE_DEFINE2(system_check_reboot, "struct ucred *", "int"); 172 173 int 174 mac_system_check_reboot(struct ucred *cred, int howto) 175 { 176 int error; 177 178 MAC_POLICY_CHECK_NOSLEEP(system_check_reboot, cred, howto); 179 MAC_CHECK_PROBE2(system_check_reboot, error, cred, howto); 180 181 return (error); 182 } 183 184 MAC_CHECK_PROBE_DEFINE2(system_check_swapon, "struct ucred *", 185 "struct vnode *"); 186 187 int 188 mac_system_check_swapon(struct ucred *cred, struct vnode *vp) 189 { 190 int error; 191 192 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapon"); 193 194 MAC_POLICY_CHECK(system_check_swapon, cred, vp, vp->v_label); 195 MAC_CHECK_PROBE2(system_check_swapon, error, cred, vp); 196 197 return (error); 198 } 199 200 MAC_CHECK_PROBE_DEFINE2(system_check_swapoff, "struct ucred *", 201 "struct vnode *"); 202 203 int 204 mac_system_check_swapoff(struct ucred *cred, struct vnode *vp) 205 { 206 int error; 207 208 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapoff"); 209 210 MAC_POLICY_CHECK(system_check_swapoff, cred, vp, vp->v_label); 211 MAC_CHECK_PROBE2(system_check_swapoff, error, cred, vp); 212 213 return (error); 214 } 215 216 MAC_CHECK_PROBE_DEFINE3(system_check_sysctl, "struct ucred *", 217 "struct sysctl_oid *", "struct sysctl_req *"); 218 219 int 220 mac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, 221 void *arg1, int arg2, struct sysctl_req *req) 222 { 223 int error; 224 225 /* 226 * XXXMAC: We would very much like to assert the SYSCTL_LOCK here, 227 * but since it's not exported from kern_sysctl.c, we can't. 228 */ 229 MAC_POLICY_CHECK_NOSLEEP(system_check_sysctl, cred, oidp, arg1, arg2, 230 req); 231 MAC_CHECK_PROBE3(system_check_sysctl, error, cred, oidp, req); 232 233 return (error); 234 } 235