1 /*- 2 * Copyright (c) 2003-2006 SPARTA, Inc. 3 * Copyright (c) 2009 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 #include "opt_posix.h" 42 43 #include <sys/param.h> 44 #include <sys/kernel.h> 45 #include <sys/ksem.h> 46 #include <sys/malloc.h> 47 #include <sys/module.h> 48 #include <sys/sdt.h> 49 #include <sys/systm.h> 50 #include <sys/sysctl.h> 51 52 #include <security/mac/mac_framework.h> 53 #include <security/mac/mac_internal.h> 54 #include <security/mac/mac_policy.h> 55 56 static struct label * 57 mac_posixsem_label_alloc(void) 58 { 59 struct label *label; 60 61 label = mac_labelzone_alloc(M_WAITOK); 62 MAC_POLICY_PERFORM(posixsem_init_label, label); 63 return (label); 64 } 65 66 void 67 mac_posixsem_init(struct ksem *ks) 68 { 69 70 if (mac_labeled & MPC_OBJECT_POSIXSEM) 71 ks->ks_label = mac_posixsem_label_alloc(); 72 else 73 ks->ks_label = NULL; 74 } 75 76 static void 77 mac_posixsem_label_free(struct label *label) 78 { 79 80 MAC_POLICY_PERFORM_NOSLEEP(posixsem_destroy_label, label); 81 mac_labelzone_free(label); 82 } 83 84 void 85 mac_posixsem_destroy(struct ksem *ks) 86 { 87 88 if (ks->ks_label != NULL) { 89 mac_posixsem_label_free(ks->ks_label); 90 ks->ks_label = NULL; 91 } 92 } 93 94 void 95 mac_posixsem_create(struct ucred *cred, struct ksem *ks) 96 { 97 98 MAC_POLICY_PERFORM_NOSLEEP(posixsem_create, cred, ks, ks->ks_label); 99 } 100 101 MAC_CHECK_PROBE_DEFINE2(posixsem_check_open, "struct ucred *", 102 "struct ksem *"); 103 104 int 105 mac_posixsem_check_open(struct ucred *cred, struct ksem *ks) 106 { 107 int error; 108 109 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_open, cred, ks, 110 ks->ks_label); 111 MAC_CHECK_PROBE2(posixsem_check_open, error, cred, ks); 112 113 return (error); 114 } 115 116 MAC_CHECK_PROBE_DEFINE3(posixsem_check_getvalue, "struct ucred *", 117 "struct ucred *", "struct ksem *"); 118 119 int 120 mac_posixsem_check_getvalue(struct ucred *active_cred, struct ucred *file_cred, 121 struct ksem *ks) 122 { 123 int error; 124 125 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_getvalue, active_cred, 126 file_cred, ks, ks->ks_label); 127 MAC_CHECK_PROBE3(posixsem_check_getvalue, error, active_cred, 128 file_cred, ks); 129 130 return (error); 131 } 132 133 MAC_CHECK_PROBE_DEFINE3(posixsem_check_post, "struct ucred *", 134 "struct ucred *", "struct ksem *"); 135 136 int 137 mac_posixsem_check_post(struct ucred *active_cred, struct ucred *file_cred, 138 struct ksem *ks) 139 { 140 int error; 141 142 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_post, active_cred, file_cred, 143 ks, ks->ks_label); 144 MAC_CHECK_PROBE3(posixsem_check_post, error, active_cred, file_cred, 145 ks); 146 147 return (error); 148 } 149 150 MAC_CHECK_PROBE_DEFINE3(posixsem_check_stat, "struct ucred *", 151 "struct ucred *", "struct ksem *"); 152 153 int 154 mac_posixsem_check_stat(struct ucred *active_cred, struct ucred *file_cred, 155 struct ksem *ks) 156 { 157 int error; 158 159 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_stat, active_cred, file_cred, 160 ks, ks->ks_label); 161 MAC_CHECK_PROBE3(posixsem_check_stat, error, active_cred, file_cred, 162 ks); 163 164 return (error); 165 } 166 167 MAC_CHECK_PROBE_DEFINE2(posixsem_check_unlink, "struct ucred *", 168 "struct ksem *"); 169 170 int 171 mac_posixsem_check_unlink(struct ucred *cred, struct ksem *ks) 172 { 173 int error; 174 175 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_unlink, cred, ks, 176 ks->ks_label); 177 MAC_CHECK_PROBE2(posixsem_check_unlink, error, cred, ks); 178 179 return (error); 180 } 181 182 MAC_CHECK_PROBE_DEFINE3(posixsem_check_wait, "struct ucred *", 183 "struct ucred *", "struct ksem *"); 184 185 int 186 mac_posixsem_check_wait(struct ucred *active_cred, struct ucred *file_cred, 187 struct ksem *ks) 188 { 189 int error; 190 191 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_wait, active_cred, file_cred, 192 ks, ks->ks_label); 193 MAC_CHECK_PROBE3(posixsem_check_wait, error, active_cred, file_cred, 194 ks); 195 196 return (error); 197 } 198 199 MAC_CHECK_PROBE_DEFINE3(posixsem_check_setmode, "struct ucred *", 200 "struct ksem *", "mode_t"); 201 202 int 203 mac_posixsem_check_setmode(struct ucred *cred, struct ksem *ks, mode_t mode) 204 { 205 int error; 206 207 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_setmode, cred, ks, 208 ks->ks_label, mode); 209 MAC_CHECK_PROBE3(posixsem_check_setmode, error, cred, ks, mode); 210 211 return (error); 212 } 213 214 MAC_CHECK_PROBE_DEFINE4(posixsem_check_setowner, "struct ucred *", 215 "struct ks *", "uid_t", "gid_t"); 216 217 int 218 mac_posixsem_check_setowner(struct ucred *cred, struct ksem *ks, uid_t uid, 219 gid_t gid) 220 { 221 int error; 222 223 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_setowner, cred, ks, 224 ks->ks_label, uid, gid); 225 MAC_CHECK_PROBE4(posixsem_check_setowner, error, cred, ks, 226 uid, gid); 227 228 return (error); 229 } 230