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 #include "opt_mac.h" 42 43 #include <sys/param.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/malloc.h> 47 #include <sys/module.h> 48 #include <sys/mutex.h> 49 #include <sys/sbuf.h> 50 #include <sys/sdt.h> 51 #include <sys/systm.h> 52 #include <sys/vnode.h> 53 #include <sys/pipe.h> 54 #include <sys/sysctl.h> 55 56 #include <security/mac/mac_framework.h> 57 #include <security/mac/mac_internal.h> 58 #include <security/mac/mac_policy.h> 59 60 struct label * 61 mac_pipe_label_alloc(void) 62 { 63 struct label *label; 64 65 label = mac_labelzone_alloc(M_WAITOK); 66 MAC_POLICY_PERFORM(pipe_init_label, label); 67 return (label); 68 } 69 70 void 71 mac_pipe_init(struct pipepair *pp) 72 { 73 74 if (mac_labeled & MPC_OBJECT_PIPE) 75 pp->pp_label = mac_pipe_label_alloc(); 76 else 77 pp->pp_label = NULL; 78 } 79 80 void 81 mac_pipe_label_free(struct label *label) 82 { 83 84 MAC_POLICY_PERFORM_NOSLEEP(pipe_destroy_label, label); 85 mac_labelzone_free(label); 86 } 87 88 void 89 mac_pipe_destroy(struct pipepair *pp) 90 { 91 92 if (pp->pp_label != NULL) { 93 mac_pipe_label_free(pp->pp_label); 94 pp->pp_label = NULL; 95 } 96 } 97 98 void 99 mac_pipe_copy_label(struct label *src, struct label *dest) 100 { 101 102 MAC_POLICY_PERFORM_NOSLEEP(pipe_copy_label, src, dest); 103 } 104 105 int 106 mac_pipe_externalize_label(struct label *label, char *elements, 107 char *outbuf, size_t outbuflen) 108 { 109 int error; 110 111 MAC_POLICY_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen); 112 113 return (error); 114 } 115 116 int 117 mac_pipe_internalize_label(struct label *label, char *string) 118 { 119 int error; 120 121 MAC_POLICY_INTERNALIZE(pipe, label, string); 122 123 return (error); 124 } 125 126 void 127 mac_pipe_create(struct ucred *cred, struct pipepair *pp) 128 { 129 130 MAC_POLICY_PERFORM_NOSLEEP(pipe_create, cred, pp, pp->pp_label); 131 } 132 133 static void 134 mac_pipe_relabel(struct ucred *cred, struct pipepair *pp, 135 struct label *newlabel) 136 { 137 138 MAC_POLICY_PERFORM_NOSLEEP(pipe_relabel, cred, pp, pp->pp_label, 139 newlabel); 140 } 141 142 MAC_CHECK_PROBE_DEFINE4(pipe_check_ioctl, "struct ucred *", 143 "struct pipepair *", "unsigned long", "void *"); 144 145 int 146 mac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, 147 unsigned long cmd, void *data) 148 { 149 int error; 150 151 mtx_assert(&pp->pp_mtx, MA_OWNED); 152 153 MAC_POLICY_CHECK_NOSLEEP(pipe_check_ioctl, cred, pp, pp->pp_label, 154 cmd, data); 155 MAC_CHECK_PROBE4(pipe_check_ioctl, error, cred, pp, cmd, data); 156 157 return (error); 158 } 159 160 MAC_CHECK_PROBE_DEFINE2(pipe_check_poll, "struct ucred *", 161 "struct pipepair *"); 162 163 int 164 mac_pipe_check_poll_impl(struct ucred *cred, struct pipepair *pp) 165 { 166 int error; 167 168 mtx_assert(&pp->pp_mtx, MA_OWNED); 169 170 MAC_POLICY_CHECK_NOSLEEP(pipe_check_poll, cred, pp, pp->pp_label); 171 MAC_CHECK_PROBE2(pipe_check_poll, error, cred, pp); 172 173 return (error); 174 } 175 176 MAC_CHECK_PROBE_DEFINE2(pipe_check_read, "struct ucred *", 177 "struct pipepair *"); 178 179 int 180 mac_pipe_check_read_impl(struct ucred *cred, struct pipepair *pp) 181 { 182 int error; 183 184 mtx_assert(&pp->pp_mtx, MA_OWNED); 185 186 MAC_POLICY_CHECK_NOSLEEP(pipe_check_read, cred, pp, pp->pp_label); 187 MAC_CHECK_PROBE2(pipe_check_read, error, cred, pp); 188 189 return (error); 190 } 191 192 MAC_CHECK_PROBE_DEFINE3(pipe_check_relabel, "struct ucred *", 193 "struct pipepair *", "struct label *"); 194 195 static int 196 mac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, 197 struct label *newlabel) 198 { 199 int error; 200 201 mtx_assert(&pp->pp_mtx, MA_OWNED); 202 203 MAC_POLICY_CHECK_NOSLEEP(pipe_check_relabel, cred, pp, pp->pp_label, 204 newlabel); 205 MAC_CHECK_PROBE3(pipe_check_relabel, error, cred, pp, newlabel); 206 207 return (error); 208 } 209 210 MAC_CHECK_PROBE_DEFINE2(pipe_check_stat, "struct ucred *", 211 "struct pipepair *"); 212 213 int 214 mac_pipe_check_stat(struct ucred *cred, struct pipepair *pp) 215 { 216 int error; 217 218 mtx_assert(&pp->pp_mtx, MA_OWNED); 219 220 MAC_POLICY_CHECK_NOSLEEP(pipe_check_stat, cred, pp, pp->pp_label); 221 MAC_CHECK_PROBE2(pipe_check_stat, error, cred, pp); 222 223 return (error); 224 } 225 226 MAC_CHECK_PROBE_DEFINE2(pipe_check_write, "struct ucred *", 227 "struct pipepair *"); 228 229 int 230 mac_pipe_check_write(struct ucred *cred, struct pipepair *pp) 231 { 232 int error; 233 234 mtx_assert(&pp->pp_mtx, MA_OWNED); 235 236 MAC_POLICY_CHECK_NOSLEEP(pipe_check_write, cred, pp, pp->pp_label); 237 MAC_CHECK_PROBE2(pipe_check_write, error, cred, pp); 238 239 return (error); 240 } 241 242 int 243 mac_pipe_label_set(struct ucred *cred, struct pipepair *pp, 244 struct label *label) 245 { 246 int error; 247 248 mtx_assert(&pp->pp_mtx, MA_OWNED); 249 250 error = mac_pipe_check_relabel(cred, pp, label); 251 if (error) 252 return (error); 253 254 mac_pipe_relabel(cred, pp, label); 255 256 return (0); 257 } 258