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_kdtrace.h" 44 #include "opt_mac.h" 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/lock.h> 49 #include <sys/malloc.h> 50 #include <sys/module.h> 51 #include <sys/mutex.h> 52 #include <sys/sbuf.h> 53 #include <sys/sdt.h> 54 #include <sys/systm.h> 55 #include <sys/vnode.h> 56 #include <sys/pipe.h> 57 #include <sys/sysctl.h> 58 59 #include <security/mac/mac_framework.h> 60 #include <security/mac/mac_internal.h> 61 #include <security/mac/mac_policy.h> 62 63 struct label * 64 mac_pipe_label_alloc(void) 65 { 66 struct label *label; 67 68 label = mac_labelzone_alloc(M_WAITOK); 69 MAC_POLICY_PERFORM(pipe_init_label, label); 70 return (label); 71 } 72 73 void 74 mac_pipe_init(struct pipepair *pp) 75 { 76 77 if (mac_labeled & MPC_OBJECT_PIPE) 78 pp->pp_label = mac_pipe_label_alloc(); 79 else 80 pp->pp_label = NULL; 81 } 82 83 void 84 mac_pipe_label_free(struct label *label) 85 { 86 87 MAC_POLICY_PERFORM_NOSLEEP(pipe_destroy_label, label); 88 mac_labelzone_free(label); 89 } 90 91 void 92 mac_pipe_destroy(struct pipepair *pp) 93 { 94 95 if (pp->pp_label != NULL) { 96 mac_pipe_label_free(pp->pp_label); 97 pp->pp_label = NULL; 98 } 99 } 100 101 void 102 mac_pipe_copy_label(struct label *src, struct label *dest) 103 { 104 105 MAC_POLICY_PERFORM_NOSLEEP(pipe_copy_label, src, dest); 106 } 107 108 int 109 mac_pipe_externalize_label(struct label *label, char *elements, 110 char *outbuf, size_t outbuflen) 111 { 112 int error; 113 114 MAC_POLICY_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen); 115 116 return (error); 117 } 118 119 int 120 mac_pipe_internalize_label(struct label *label, char *string) 121 { 122 int error; 123 124 MAC_POLICY_INTERNALIZE(pipe, label, string); 125 126 return (error); 127 } 128 129 void 130 mac_pipe_create(struct ucred *cred, struct pipepair *pp) 131 { 132 133 MAC_POLICY_PERFORM_NOSLEEP(pipe_create, cred, pp, pp->pp_label); 134 } 135 136 static void 137 mac_pipe_relabel(struct ucred *cred, struct pipepair *pp, 138 struct label *newlabel) 139 { 140 141 MAC_POLICY_PERFORM_NOSLEEP(pipe_relabel, cred, pp, pp->pp_label, 142 newlabel); 143 } 144 145 MAC_CHECK_PROBE_DEFINE4(pipe_check_ioctl, "struct ucred *", 146 "struct pipepair *", "unsigned long", "void *"); 147 148 int 149 mac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 150 unsigned long cmd, void *data) 151 { 152 int error; 153 154 mtx_assert(&pp->pp_mtx, MA_OWNED); 155 156 MAC_POLICY_CHECK_NOSLEEP(pipe_check_ioctl, cred, pp, pp->pp_label, 157 cmd, data); 158 MAC_CHECK_PROBE4(pipe_check_ioctl, error, cred, pp, cmd, data); 159 160 return (error); 161 } 162 163 MAC_CHECK_PROBE_DEFINE2(pipe_check_poll, "struct ucred *", 164 "struct pipepair *"); 165 166 int 167 mac_pipe_check_poll(struct ucred *cred, struct pipepair *pp) 168 { 169 int error; 170 171 mtx_assert(&pp->pp_mtx, MA_OWNED); 172 173 MAC_POLICY_CHECK_NOSLEEP(pipe_check_poll, cred, pp, pp->pp_label); 174 MAC_CHECK_PROBE2(pipe_check_poll, error, cred, pp); 175 176 return (error); 177 } 178 179 MAC_CHECK_PROBE_DEFINE2(pipe_check_read, "struct ucred *", 180 "struct pipepair *"); 181 182 int 183 mac_pipe_check_read(struct ucred *cred, struct pipepair *pp) 184 { 185 int error; 186 187 mtx_assert(&pp->pp_mtx, MA_OWNED); 188 189 MAC_POLICY_CHECK_NOSLEEP(pipe_check_read, cred, pp, pp->pp_label); 190 MAC_CHECK_PROBE2(pipe_check_read, error, cred, pp); 191 192 return (error); 193 } 194 195 MAC_CHECK_PROBE_DEFINE3(pipe_check_relabel, "struct ucred *", 196 "struct pipepair *", "struct label *"); 197 198 static int 199 mac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 200 struct label *newlabel) 201 { 202 int error; 203 204 mtx_assert(&pp->pp_mtx, MA_OWNED); 205 206 MAC_POLICY_CHECK_NOSLEEP(pipe_check_relabel, cred, pp, pp->pp_label, 207 newlabel); 208 MAC_CHECK_PROBE3(pipe_check_relabel, error, cred, pp, newlabel); 209 210 return (error); 211 } 212 213 MAC_CHECK_PROBE_DEFINE2(pipe_check_stat, "struct ucred *", 214 "struct pipepair *"); 215 216 int 217 mac_pipe_check_stat(struct ucred *cred, struct pipepair *pp) 218 { 219 int error; 220 221 mtx_assert(&pp->pp_mtx, MA_OWNED); 222 223 MAC_POLICY_CHECK_NOSLEEP(pipe_check_stat, cred, pp, pp->pp_label); 224 MAC_CHECK_PROBE2(pipe_check_stat, error, cred, pp); 225 226 return (error); 227 } 228 229 MAC_CHECK_PROBE_DEFINE2(pipe_check_write, "struct ucred *", 230 "struct pipepair *"); 231 232 int 233 mac_pipe_check_write(struct ucred *cred, struct pipepair *pp) 234 { 235 int error; 236 237 mtx_assert(&pp->pp_mtx, MA_OWNED); 238 239 MAC_POLICY_CHECK_NOSLEEP(pipe_check_write, cred, pp, pp->pp_label); 240 MAC_CHECK_PROBE2(pipe_check_write, error, cred, pp); 241 242 return (error); 243 } 244 245 int 246 mac_pipe_label_set(struct ucred *cred, struct pipepair *pp, 247 struct label *label) 248 { 249 int error; 250 251 mtx_assert(&pp->pp_mtx, MA_OWNED); 252 253 error = mac_pipe_check_relabel(cred, pp, label); 254 if (error) 255 return (error); 256 257 mac_pipe_relabel(cred, pp, label); 258 259 return (0); 260 } 261