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/malloc.h> 41 #include <sys/mac.h> 42 #include <sys/module.h> 43 #include <sys/systm.h> 44 #include <sys/sysctl.h> 45 46 #include <posix4/ksem.h> 47 48 #include <sys/mac_policy.h> 49 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 #ifdef MAC_DEBUG 58 static unsigned int nmacposixsems; 59 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, posix_sems, CTLFLAG_RD, 60 &nmacposixsems, 0, "number of posix global semaphores inuse"); 61 #endif 62 63 static struct label * 64 mac_posix_sem_label_alloc(void) 65 { 66 struct label *label; 67 68 label = mac_labelzone_alloc(M_WAITOK); 69 MAC_PERFORM(init_posix_sem_label, label); 70 MAC_DEBUG_COUNTER_INC(&nmacposixsems); 71 return (label); 72 } 73 74 void 75 mac_init_posix_sem(struct ksem *ksemptr) 76 { 77 78 ksemptr->ks_label = mac_posix_sem_label_alloc(); 79 } 80 81 static void 82 mac_posix_sem_label_free(struct label *label) 83 { 84 85 MAC_PERFORM(destroy_posix_sem_label, label); 86 MAC_DEBUG_COUNTER_DEC(&nmacposixsems); 87 } 88 89 void 90 mac_destroy_posix_sem(struct ksem *ksemptr) 91 { 92 93 mac_posix_sem_label_free(ksemptr->ks_label); 94 ksemptr->ks_label = NULL; 95 } 96 97 void 98 mac_create_posix_sem(struct ucred *cred, struct ksem *ksemptr) 99 { 100 101 MAC_PERFORM(create_posix_sem, cred, ksemptr, ksemptr->ks_label); 102 } 103 104 int 105 mac_check_posix_sem_destroy(struct ucred *cred, struct ksem *ksemptr) 106 { 107 int error; 108 109 if (!mac_enforce_posix_sem) 110 return (0); 111 112 MAC_CHECK(check_posix_sem_destroy, cred, ksemptr, ksemptr->ks_label); 113 114 return(error); 115 } 116 117 int 118 mac_check_posix_sem_open(struct ucred *cred, struct ksem *ksemptr) 119 { 120 int error; 121 122 if (!mac_enforce_posix_sem) 123 return (0); 124 125 MAC_CHECK(check_posix_sem_open, cred, ksemptr, ksemptr->ks_label); 126 127 return(error); 128 } 129 130 int 131 mac_check_posix_sem_getvalue(struct ucred *cred, struct ksem *ksemptr) 132 { 133 int error; 134 135 if (!mac_enforce_posix_sem) 136 return (0); 137 138 MAC_CHECK(check_posix_sem_getvalue, cred, ksemptr, 139 ksemptr->ks_label); 140 141 return(error); 142 } 143 144 int 145 mac_check_posix_sem_post(struct ucred *cred, struct ksem *ksemptr) 146 { 147 int error; 148 149 if (!mac_enforce_posix_sem) 150 return (0); 151 152 MAC_CHECK(check_posix_sem_post, cred, ksemptr, ksemptr->ks_label); 153 154 return(error); 155 } 156 157 int 158 mac_check_posix_sem_unlink(struct ucred *cred, struct ksem *ksemptr) 159 { 160 int error; 161 162 if (!mac_enforce_posix_sem) 163 return (0); 164 165 MAC_CHECK(check_posix_sem_unlink, cred, ksemptr, ksemptr->ks_label); 166 167 return(error); 168 } 169 170 int 171 mac_check_posix_sem_wait(struct ucred *cred, struct ksem *ksemptr) 172 { 173 int error; 174 175 if (!mac_enforce_posix_sem) 176 return (0); 177 178 MAC_CHECK(check_posix_sem_wait, cred, ksemptr, ksemptr->ks_label); 179 180 return(error); 181 } 182