1 /*- 2 * Copyright (c) 2003-2006 SPARTA, Inc. 3 * Copyright (c) 2009-2011 Robert N. M. Watson 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project in part by Network 7 * Associates Laboratories, the Security Research Division of Network 8 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 9 * as part of the DARPA CHATS research program. 10 * 11 * This software was enhanced by SPARTA ISSO under SPAWAR contract 12 * N66001-04-C-6019 ("SEFOS"). * 13 * 14 * This software was developed at the University of Cambridge Computer 15 * Laboratory with support from a grant from Google, Inc. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #include "opt_mac.h" 41 42 #include <sys/param.h> 43 #include <sys/kernel.h> 44 #include <sys/mman.h> 45 #include <sys/malloc.h> 46 #include <sys/module.h> 47 #include <sys/sdt.h> 48 #include <sys/systm.h> 49 #include <sys/sysctl.h> 50 51 #include <security/mac/mac_framework.h> 52 #include <security/mac/mac_internal.h> 53 #include <security/mac/mac_policy.h> 54 55 static struct label * 56 mac_posixshm_label_alloc(void) 57 { 58 struct label *label; 59 60 label = mac_labelzone_alloc(M_WAITOK); 61 MAC_POLICY_PERFORM(posixshm_init_label, label); 62 return (label); 63 } 64 65 void 66 mac_posixshm_init(struct shmfd *shmfd) 67 { 68 69 if (mac_labeled & MPC_OBJECT_POSIXSHM) 70 shmfd->shm_label = mac_posixshm_label_alloc(); 71 else 72 shmfd->shm_label = NULL; 73 } 74 75 static void 76 mac_posixshm_label_free(struct label *label) 77 { 78 79 MAC_POLICY_PERFORM_NOSLEEP(posixshm_destroy_label, label); 80 mac_labelzone_free(label); 81 } 82 83 void 84 mac_posixshm_destroy(struct shmfd *shmfd) 85 { 86 87 if (shmfd->shm_label != NULL) { 88 mac_posixshm_label_free(shmfd->shm_label); 89 shmfd->shm_label = NULL; 90 } 91 } 92 93 void 94 mac_posixshm_create(struct ucred *cred, struct shmfd *shmfd) 95 { 96 97 MAC_POLICY_PERFORM_NOSLEEP(posixshm_create, cred, shmfd, 98 shmfd->shm_label); 99 } 100 101 MAC_CHECK_PROBE_DEFINE2(posixshm_check_create, "struct ucred *", 102 "const char *"); 103 104 int 105 mac_posixshm_check_create(struct ucred *cred, const char *path) 106 { 107 int error; 108 109 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_create, cred, path); 110 MAC_CHECK_PROBE2(posixshm_check_create, error, cred, path); 111 112 return (error); 113 } 114 115 MAC_CHECK_PROBE_DEFINE4(posixshm_check_mmap, "struct ucred *", 116 "struct shmfd *", "int", "int"); 117 118 int 119 mac_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, int prot, 120 int flags) 121 { 122 int error; 123 124 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_mmap, cred, shmfd, 125 shmfd->shm_label, prot, flags); 126 MAC_CHECK_PROBE4(posixshm_check_mmap, error, cred, shmfd, prot, 127 flags); 128 129 return (error); 130 } 131 132 MAC_CHECK_PROBE_DEFINE3(posixshm_check_open, "struct ucred *", 133 "struct shmfd *", "accmode_t"); 134 135 int 136 mac_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd, 137 accmode_t accmode) 138 { 139 int error; 140 141 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_open, cred, shmfd, 142 shmfd->shm_label, accmode); 143 MAC_CHECK_PROBE3(posixshm_check_open, error, cred, shmfd, accmode); 144 145 return (error); 146 } 147 148 MAC_CHECK_PROBE_DEFINE3(posixshm_check_stat, "struct ucred *", 149 "struct ucred *", "struct shmfd *"); 150 151 int 152 mac_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred, 153 struct shmfd *shmfd) 154 { 155 int error; 156 157 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_stat, active_cred, file_cred, 158 shmfd, shmfd->shm_label); 159 MAC_CHECK_PROBE3(posixshm_check_stat, error, active_cred, file_cred, 160 shmfd); 161 162 return (error); 163 } 164 165 MAC_CHECK_PROBE_DEFINE3(posixshm_check_truncate, "struct ucred *", 166 "struct ucred *", "struct shmfd *"); 167 168 int 169 mac_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred, 170 struct shmfd *shmfd) 171 { 172 int error; 173 174 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_truncate, active_cred, 175 file_cred, shmfd, shmfd->shm_label); 176 MAC_CHECK_PROBE3(posixshm_check_truncate, error, active_cred, 177 file_cred, shmfd); 178 179 return (error); 180 } 181 182 MAC_CHECK_PROBE_DEFINE2(posixshm_check_unlink, "struct ucred *", 183 "struct shmfd *"); 184 185 int 186 mac_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd) 187 { 188 int error; 189 190 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_unlink, cred, shmfd, 191 shmfd->shm_label); 192 MAC_CHECK_PROBE2(posixshm_check_unlink, error, cred, shmfd); 193 194 return (error); 195 } 196 197 MAC_CHECK_PROBE_DEFINE3(posixshm_check_setmode, "struct ucred *", 198 "struct shmfd *", "mode_t"); 199 200 int 201 mac_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd, mode_t mode) 202 { 203 int error; 204 205 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setmode, cred, shmfd, 206 shmfd->shm_label, mode); 207 MAC_CHECK_PROBE3(posixshm_check_setmode, error, cred, shmfd, mode); 208 209 return (error); 210 } 211 212 MAC_CHECK_PROBE_DEFINE4(posixshm_check_setowner, "struct ucred *", 213 "struct shmfd *", "uid_t", "gid_t"); 214 215 int 216 mac_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd, uid_t uid, 217 gid_t gid) 218 { 219 int error; 220 221 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setowner, cred, shmfd, 222 shmfd->shm_label, uid, gid); 223 MAC_CHECK_PROBE4(posixshm_check_setowner, error, cred, shmfd, 224 uid, gid); 225 226 return (error); 227 } 228 229 MAC_CHECK_PROBE_DEFINE3(posixshm_check_read, "struct ucred *", 230 "struct ucred *", "struct shmfd *"); 231 232 int 233 mac_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred, 234 struct shmfd *shmfd) 235 { 236 int error; 237 238 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_read, active_cred, 239 file_cred, shmfd, shmfd->shm_label); 240 MAC_CHECK_PROBE3(posixshm_check_read, error, active_cred, 241 file_cred, shmfd); 242 243 return (error); 244 } 245 246 MAC_CHECK_PROBE_DEFINE3(posixshm_check_write, "struct ucred *", 247 "struct ucred *", "struct shmfd *"); 248 249 int 250 mac_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred, 251 struct shmfd *shmfd) 252 { 253 int error; 254 255 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_write, active_cred, 256 file_cred, shmfd, shmfd->shm_label); 257 MAC_CHECK_PROBE3(posixshm_check_write, error, active_cred, 258 file_cred, shmfd); 259 260 return (error); 261 } 262