1 /*- 2 * Copyright (c) 2003-2005 SPARTA, Inc. 3 * All rights reserved. 4 * 5 * This software was developed for the FreeBSD Project in part by Network 6 * Associates Laboratories, the Security Research Division of Network 7 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 8 * as part of the DARPA CHATS research program. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_mac.h" 36 #include "opt_posix.h" 37 38 #include <sys/param.h> 39 #include <sys/kernel.h> 40 #include <sys/ksem.h> 41 #include <sys/malloc.h> 42 #include <sys/mac.h> 43 #include <sys/module.h> 44 #include <sys/systm.h> 45 #include <sys/sysctl.h> 46 47 #include <sys/mac_policy.h> 48 49 #include <security/mac/mac_framework.h> 50 #include <security/mac/mac_internal.h> 51 52 static int mac_enforce_posix_sem = 1; 53 SYSCTL_INT(_security_mac, OID_AUTO, enforce_posix_sem, CTLFLAG_RW, 54 &mac_enforce_posix_sem, 0, "Enforce MAC policy on global POSIX semaphores"); 55 TUNABLE_INT("security.mac.enforce_posix_sem", &mac_enforce_posix_sem); 56 57 static struct label * 58 mac_posix_sem_label_alloc(void) 59 { 60 struct label *label; 61 62 label = mac_labelzone_alloc(M_WAITOK); 63 MAC_PERFORM(init_posix_sem_label, label); 64 return (label); 65 } 66 67 void 68 mac_init_posix_sem(struct ksem *ksemptr) 69 { 70 71 ksemptr->ks_label = mac_posix_sem_label_alloc(); 72 } 73 74 static void 75 mac_posix_sem_label_free(struct label *label) 76 { 77 78 MAC_PERFORM(destroy_posix_sem_label, label); 79 } 80 81 void 82 mac_destroy_posix_sem(struct ksem *ksemptr) 83 { 84 85 mac_posix_sem_label_free(ksemptr->ks_label); 86 ksemptr->ks_label = NULL; 87 } 88 89 void 90 mac_create_posix_sem(struct ucred *cred, struct ksem *ksemptr) 91 { 92 93 MAC_PERFORM(create_posix_sem, cred, ksemptr, ksemptr->ks_label); 94 } 95 96 int 97 mac_check_posix_sem_destroy(struct ucred *cred, struct ksem *ksemptr) 98 { 99 int error; 100 101 if (!mac_enforce_posix_sem) 102 return (0); 103 104 MAC_CHECK(check_posix_sem_destroy, cred, ksemptr, ksemptr->ks_label); 105 106 return(error); 107 } 108 109 int 110 mac_check_posix_sem_open(struct ucred *cred, struct ksem *ksemptr) 111 { 112 int error; 113 114 if (!mac_enforce_posix_sem) 115 return (0); 116 117 MAC_CHECK(check_posix_sem_open, cred, ksemptr, ksemptr->ks_label); 118 119 return(error); 120 } 121 122 int 123 mac_check_posix_sem_getvalue(struct ucred *cred, struct ksem *ksemptr) 124 { 125 int error; 126 127 if (!mac_enforce_posix_sem) 128 return (0); 129 130 MAC_CHECK(check_posix_sem_getvalue, cred, ksemptr, 131 ksemptr->ks_label); 132 133 return(error); 134 } 135 136 int 137 mac_check_posix_sem_post(struct ucred *cred, struct ksem *ksemptr) 138 { 139 int error; 140 141 if (!mac_enforce_posix_sem) 142 return (0); 143 144 MAC_CHECK(check_posix_sem_post, cred, ksemptr, ksemptr->ks_label); 145 146 return(error); 147 } 148 149 int 150 mac_check_posix_sem_unlink(struct ucred *cred, struct ksem *ksemptr) 151 { 152 int error; 153 154 if (!mac_enforce_posix_sem) 155 return (0); 156 157 MAC_CHECK(check_posix_sem_unlink, cred, ksemptr, ksemptr->ks_label); 158 159 return(error); 160 } 161 162 int 163 mac_check_posix_sem_wait(struct ucred *cred, struct ksem *ksemptr) 164 { 165 int error; 166 167 if (!mac_enforce_posix_sem) 168 return (0); 169 170 MAC_CHECK(check_posix_sem_wait, cred, ksemptr, ksemptr->ks_label); 171 172 return(error); 173 } 174