1 /*- 2 * Copyright (c) 2002, 2003 Networks Associates Technology, 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 37 #include <sys/param.h> 38 #include <sys/kernel.h> 39 #include <sys/lock.h> 40 #include <sys/malloc.h> 41 #include <sys/module.h> 42 #include <sys/mutex.h> 43 #include <sys/mac.h> 44 #include <sys/sbuf.h> 45 #include <sys/systm.h> 46 #include <sys/vnode.h> 47 #include <sys/pipe.h> 48 #include <sys/sysctl.h> 49 50 #include <sys/mac_policy.h> 51 52 #include <security/mac/mac_internal.h> 53 54 static int mac_enforce_pipe = 1; 55 SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW, 56 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations"); 57 TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe); 58 59 #ifdef MAC_DEBUG 60 static unsigned int nmacpipes; 61 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD, 62 &nmacpipes, 0, "number of pipes in use"); 63 #endif 64 65 struct label * 66 mac_pipe_label_alloc(void) 67 { 68 struct label *label; 69 70 label = mac_labelzone_alloc(M_WAITOK); 71 MAC_PERFORM(init_pipe_label, label); 72 MAC_DEBUG_COUNTER_INC(&nmacpipes); 73 return (label); 74 } 75 76 void 77 mac_init_pipe(struct pipepair *pp) 78 { 79 80 pp->pp_label = mac_pipe_label_alloc(); 81 } 82 83 void 84 mac_pipe_label_free(struct label *label) 85 { 86 87 MAC_PERFORM(destroy_pipe_label, label); 88 mac_labelzone_free(label); 89 MAC_DEBUG_COUNTER_DEC(&nmacpipes); 90 } 91 92 void 93 mac_destroy_pipe(struct pipepair *pp) 94 { 95 96 mac_pipe_label_free(pp->pp_label); 97 pp->pp_label = NULL; 98 } 99 100 void 101 mac_copy_pipe_label(struct label *src, struct label *dest) 102 { 103 104 MAC_PERFORM(copy_pipe_label, src, dest); 105 } 106 107 int 108 mac_externalize_pipe_label(struct label *label, char *elements, 109 char *outbuf, size_t outbuflen) 110 { 111 int error; 112 113 MAC_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen); 114 115 return (error); 116 } 117 118 int 119 mac_internalize_pipe_label(struct label *label, char *string) 120 { 121 int error; 122 123 MAC_INTERNALIZE(pipe, label, string); 124 125 return (error); 126 } 127 128 void 129 mac_create_pipe(struct ucred *cred, struct pipepair *pp) 130 { 131 132 MAC_PERFORM(create_pipe, cred, pp, pp->pp_label); 133 } 134 135 static void 136 mac_relabel_pipe(struct ucred *cred, struct pipepair *pp, 137 struct label *newlabel) 138 { 139 140 MAC_PERFORM(relabel_pipe, cred, pp, pp->pp_label, newlabel); 141 } 142 143 int 144 mac_check_pipe_ioctl(struct ucred *cred, struct pipepair *pp, 145 unsigned long cmd, void *data) 146 { 147 int error; 148 149 mtx_assert(&pp->pp_mtx, MA_OWNED); 150 151 if (!mac_enforce_pipe) 152 return (0); 153 154 MAC_CHECK(check_pipe_ioctl, cred, pp, pp->pp_label, cmd, data); 155 156 return (error); 157 } 158 159 int 160 mac_check_pipe_poll(struct ucred *cred, struct pipepair *pp) 161 { 162 int error; 163 164 mtx_assert(&pp->pp_mtx, MA_OWNED); 165 166 if (!mac_enforce_pipe) 167 return (0); 168 169 MAC_CHECK(check_pipe_poll, cred, pp, pp->pp_label); 170 171 return (error); 172 } 173 174 int 175 mac_check_pipe_read(struct ucred *cred, struct pipepair *pp) 176 { 177 int error; 178 179 mtx_assert(&pp->pp_mtx, MA_OWNED); 180 181 if (!mac_enforce_pipe) 182 return (0); 183 184 MAC_CHECK(check_pipe_read, cred, pp, pp->pp_label); 185 186 return (error); 187 } 188 189 static int 190 mac_check_pipe_relabel(struct ucred *cred, struct pipepair *pp, 191 struct label *newlabel) 192 { 193 int error; 194 195 mtx_assert(&pp->pp_mtx, MA_OWNED); 196 197 if (!mac_enforce_pipe) 198 return (0); 199 200 MAC_CHECK(check_pipe_relabel, cred, pp, pp->pp_label, newlabel); 201 202 return (error); 203 } 204 205 int 206 mac_check_pipe_stat(struct ucred *cred, struct pipepair *pp) 207 { 208 int error; 209 210 mtx_assert(&pp->pp_mtx, MA_OWNED); 211 212 if (!mac_enforce_pipe) 213 return (0); 214 215 MAC_CHECK(check_pipe_stat, cred, pp, pp->pp_label); 216 217 return (error); 218 } 219 220 int 221 mac_check_pipe_write(struct ucred *cred, struct pipepair *pp) 222 { 223 int error; 224 225 mtx_assert(&pp->pp_mtx, MA_OWNED); 226 227 if (!mac_enforce_pipe) 228 return (0); 229 230 MAC_CHECK(check_pipe_write, cred, pp, pp->pp_label); 231 232 return (error); 233 } 234 235 int 236 mac_pipe_label_set(struct ucred *cred, struct pipepair *pp, 237 struct label *label) 238 { 239 int error; 240 241 mtx_assert(&pp->pp_mtx, MA_OWNED); 242 243 error = mac_check_pipe_relabel(cred, pp, label); 244 if (error) 245 return (error); 246 247 mac_relabel_pipe(cred, pp, label); 248 249 return (0); 250 } 251