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