1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2006 SPARTA, Inc. 4 * Copyright (c) 2009 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * This software was developed for the FreeBSD Project in part by Network 8 * Associates Laboratories, the Security Research Division of Network 9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 10 * as part of the DARPA CHATS research program. 11 * 12 * This software was enhanced by SPARTA ISSO under SPAWAR contract 13 * N66001-04-C-6019 ("SEFOS"). 14 * 15 * This software was developed at the University of Cambridge Computer 16 * Laboratory with support from a grant from Google, Inc. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_mac.h" 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/module.h> 50 #include <sys/mutex.h> 51 #include <sys/sbuf.h> 52 #include <sys/sdt.h> 53 #include <sys/systm.h> 54 #include <sys/vnode.h> 55 #include <sys/pipe.h> 56 #include <sys/sysctl.h> 57 58 #include <security/mac/mac_framework.h> 59 #include <security/mac/mac_internal.h> 60 #include <security/mac/mac_policy.h> 61 62 struct label * 63 mac_pipe_label_alloc(void) 64 { 65 struct label *label; 66 67 label = mac_labelzone_alloc(M_WAITOK); 68 MAC_POLICY_PERFORM(pipe_init_label, label); 69 return (label); 70 } 71 72 void 73 mac_pipe_init(struct pipepair *pp) 74 { 75 76 if (mac_labeled & MPC_OBJECT_PIPE) 77 pp->pp_label = mac_pipe_label_alloc(); 78 else 79 pp->pp_label = NULL; 80 } 81 82 void 83 mac_pipe_label_free(struct label *label) 84 { 85 86 MAC_POLICY_PERFORM_NOSLEEP(pipe_destroy_label, label); 87 mac_labelzone_free(label); 88 } 89 90 void 91 mac_pipe_destroy(struct pipepair *pp) 92 { 93 94 if (pp->pp_label != NULL) { 95 mac_pipe_label_free(pp->pp_label); 96 pp->pp_label = NULL; 97 } 98 } 99 100 void 101 mac_pipe_copy_label(struct label *src, struct label *dest) 102 { 103 104 MAC_POLICY_PERFORM_NOSLEEP(pipe_copy_label, src, dest); 105 } 106 107 int 108 mac_pipe_externalize_label(struct label *label, char *elements, 109 char *outbuf, size_t outbuflen) 110 { 111 int error; 112 113 MAC_POLICY_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen); 114 115 return (error); 116 } 117 118 int 119 mac_pipe_internalize_label(struct label *label, char *string) 120 { 121 int error; 122 123 MAC_POLICY_INTERNALIZE(pipe, label, string); 124 125 return (error); 126 } 127 128 void 129 mac_pipe_create(struct ucred *cred, struct pipepair *pp) 130 { 131 132 MAC_POLICY_PERFORM_NOSLEEP(pipe_create, cred, pp, pp->pp_label); 133 } 134 135 static void 136 mac_pipe_relabel(struct ucred *cred, struct pipepair *pp, 137 struct label *newlabel) 138 { 139 140 MAC_POLICY_PERFORM_NOSLEEP(pipe_relabel, cred, pp, pp->pp_label, 141 newlabel); 142 } 143 144 MAC_CHECK_PROBE_DEFINE4(pipe_check_ioctl, "struct ucred *", 145 "struct pipepair *", "unsigned long", "void *"); 146 147 int 148 mac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 149 unsigned long cmd, void *data) 150 { 151 int error; 152 153 mtx_assert(&pp->pp_mtx, MA_OWNED); 154 155 MAC_POLICY_CHECK_NOSLEEP(pipe_check_ioctl, cred, pp, pp->pp_label, 156 cmd, data); 157 MAC_CHECK_PROBE4(pipe_check_ioctl, error, cred, pp, cmd, data); 158 159 return (error); 160 } 161 162 MAC_CHECK_PROBE_DEFINE2(pipe_check_poll, "struct ucred *", 163 "struct pipepair *"); 164 165 int 166 mac_pipe_check_poll_impl(struct ucred *cred, struct pipepair *pp) 167 { 168 int error; 169 170 mtx_assert(&pp->pp_mtx, MA_OWNED); 171 172 MAC_POLICY_CHECK_NOSLEEP(pipe_check_poll, cred, pp, pp->pp_label); 173 MAC_CHECK_PROBE2(pipe_check_poll, error, cred, pp); 174 175 return (error); 176 } 177 178 MAC_CHECK_PROBE_DEFINE2(pipe_check_read, "struct ucred *", 179 "struct pipepair *"); 180 181 int 182 mac_pipe_check_read(struct ucred *cred, struct pipepair *pp) 183 { 184 int error; 185 186 mtx_assert(&pp->pp_mtx, MA_OWNED); 187 188 MAC_POLICY_CHECK_NOSLEEP(pipe_check_read, cred, pp, pp->pp_label); 189 MAC_CHECK_PROBE2(pipe_check_read, error, cred, pp); 190 191 return (error); 192 } 193 194 MAC_CHECK_PROBE_DEFINE3(pipe_check_relabel, "struct ucred *", 195 "struct pipepair *", "struct label *"); 196 197 static int 198 mac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 199 struct label *newlabel) 200 { 201 int error; 202 203 mtx_assert(&pp->pp_mtx, MA_OWNED); 204 205 MAC_POLICY_CHECK_NOSLEEP(pipe_check_relabel, cred, pp, pp->pp_label, 206 newlabel); 207 MAC_CHECK_PROBE3(pipe_check_relabel, error, cred, pp, newlabel); 208 209 return (error); 210 } 211 212 MAC_CHECK_PROBE_DEFINE2(pipe_check_stat, "struct ucred *", 213 "struct pipepair *"); 214 215 int 216 mac_pipe_check_stat(struct ucred *cred, struct pipepair *pp) 217 { 218 int error; 219 220 mtx_assert(&pp->pp_mtx, MA_OWNED); 221 222 MAC_POLICY_CHECK_NOSLEEP(pipe_check_stat, cred, pp, pp->pp_label); 223 MAC_CHECK_PROBE2(pipe_check_stat, error, cred, pp); 224 225 return (error); 226 } 227 228 MAC_CHECK_PROBE_DEFINE2(pipe_check_write, "struct ucred *", 229 "struct pipepair *"); 230 231 int 232 mac_pipe_check_write(struct ucred *cred, struct pipepair *pp) 233 { 234 int error; 235 236 mtx_assert(&pp->pp_mtx, MA_OWNED); 237 238 MAC_POLICY_CHECK_NOSLEEP(pipe_check_write, cred, pp, pp->pp_label); 239 MAC_CHECK_PROBE2(pipe_check_write, error, cred, pp); 240 241 return (error); 242 } 243 244 int 245 mac_pipe_label_set(struct ucred *cred, struct pipepair *pp, 246 struct label *label) 247 { 248 int error; 249 250 mtx_assert(&pp->pp_mtx, MA_OWNED); 251 252 error = mac_pipe_check_relabel(cred, pp, label); 253 if (error) 254 return (error); 255 256 mac_pipe_relabel(cred, pp, label); 257 258 return (0); 259 } 260