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 __FBSDID("$FreeBSD$"); 41 42 #include "opt_kdtrace.h" 43 #include "opt_mac.h" 44 #include "opt_posix.h" 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/ksem.h> 49 #include <sys/malloc.h> 50 #include <sys/module.h> 51 #include <sys/sdt.h> 52 #include <sys/systm.h> 53 #include <sys/sysctl.h> 54 55 #include <security/mac/mac_framework.h> 56 #include <security/mac/mac_internal.h> 57 #include <security/mac/mac_policy.h> 58 59 static struct label * 60 mac_posixsem_label_alloc(void) 61 { 62 struct label *label; 63 64 label = mac_labelzone_alloc(M_WAITOK); 65 MAC_POLICY_PERFORM(posixsem_init_label, label); 66 return (label); 67 } 68 69 void 70 mac_posixsem_init(struct ksem *ks) 71 { 72 73 if (mac_labeled & MPC_OBJECT_POSIXSEM) 74 ks->ks_label = mac_posixsem_label_alloc(); 75 else 76 ks->ks_label = NULL; 77 } 78 79 static void 80 mac_posixsem_label_free(struct label *label) 81 { 82 83 MAC_POLICY_PERFORM_NOSLEEP(posixsem_destroy_label, label); 84 mac_labelzone_free(label); 85 } 86 87 void 88 mac_posixsem_destroy(struct ksem *ks) 89 { 90 91 if (ks->ks_label != NULL) { 92 mac_posixsem_label_free(ks->ks_label); 93 ks->ks_label = NULL; 94 } 95 } 96 97 void 98 mac_posixsem_create(struct ucred *cred, struct ksem *ks) 99 { 100 101 MAC_POLICY_PERFORM_NOSLEEP(posixsem_create, cred, ks, ks->ks_label); 102 } 103 104 MAC_CHECK_PROBE_DEFINE2(posixsem_check_open, "struct ucred *", 105 "struct ksem *"); 106 107 int 108 mac_posixsem_check_open(struct ucred *cred, struct ksem *ks) 109 { 110 int error; 111 112 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_open, cred, ks, 113 ks->ks_label); 114 MAC_CHECK_PROBE2(posixsem_check_open, error, cred, ks); 115 116 return (error); 117 } 118 119 MAC_CHECK_PROBE_DEFINE3(posixsem_check_getvalue, "struct ucred *", 120 "struct ucred *", "struct ksem *"); 121 122 int 123 mac_posixsem_check_getvalue(struct ucred *active_cred, struct ucred *file_cred, 124 struct ksem *ks) 125 { 126 int error; 127 128 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_getvalue, active_cred, 129 file_cred, ks, ks->ks_label); 130 MAC_CHECK_PROBE3(posixsem_check_getvalue, error, active_cred, 131 file_cred, ks); 132 133 return (error); 134 } 135 136 MAC_CHECK_PROBE_DEFINE3(posixsem_check_post, "struct ucred *", 137 "struct ucred *", "struct ksem *"); 138 139 int 140 mac_posixsem_check_post(struct ucred *active_cred, struct ucred *file_cred, 141 struct ksem *ks) 142 { 143 int error; 144 145 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_post, active_cred, file_cred, 146 ks, ks->ks_label); 147 MAC_CHECK_PROBE3(posixsem_check_post, error, active_cred, file_cred, 148 ks); 149 150 return (error); 151 } 152 153 MAC_CHECK_PROBE_DEFINE3(posixsem_check_stat, "struct ucred *", 154 "struct ucred *", "struct ksem *"); 155 156 int 157 mac_posixsem_check_stat(struct ucred *active_cred, struct ucred *file_cred, 158 struct ksem *ks) 159 { 160 int error; 161 162 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_stat, active_cred, file_cred, 163 ks, ks->ks_label); 164 MAC_CHECK_PROBE3(posixsem_check_stat, error, active_cred, file_cred, 165 ks); 166 167 return (error); 168 } 169 170 MAC_CHECK_PROBE_DEFINE2(posixsem_check_unlink, "struct ucred *", 171 "struct ksem *"); 172 173 int 174 mac_posixsem_check_unlink(struct ucred *cred, struct ksem *ks) 175 { 176 int error; 177 178 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_unlink, cred, ks, 179 ks->ks_label); 180 MAC_CHECK_PROBE2(posixsem_check_unlink, error, cred, ks); 181 182 return (error); 183 } 184 185 MAC_CHECK_PROBE_DEFINE3(posixsem_check_wait, "struct ucred *", 186 "struct ucred *", "struct ksem *"); 187 188 int 189 mac_posixsem_check_wait(struct ucred *active_cred, struct ucred *file_cred, 190 struct ksem *ks) 191 { 192 int error; 193 194 MAC_POLICY_CHECK_NOSLEEP(posixsem_check_wait, active_cred, file_cred, 195 ks, ks->ks_label); 196 MAC_CHECK_PROBE3(posixsem_check_wait, error, active_cred, file_cred, 197 ks); 198 199 return (error); 200 } 201