mac_pipe.c revision 189797
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: head/sys/security/mac/mac_pipe.c 189797 2009-03-14 16:06:06Z rwatson $"); 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 63struct label * 64mac_pipe_label_alloc(void) 65{ 66 struct label *label; 67 68 label = mac_labelzone_alloc(M_WAITOK); 69 MAC_PERFORM(pipe_init_label, label); 70 return (label); 71} 72 73void 74mac_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 83void 84mac_pipe_label_free(struct label *label) 85{ 86 87 MAC_PERFORM_NOSLEEP(pipe_destroy_label, label); 88 mac_labelzone_free(label); 89} 90 91void 92mac_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 101void 102mac_pipe_copy_label(struct label *src, struct label *dest) 103{ 104 105 MAC_PERFORM_NOSLEEP(pipe_copy_label, src, dest); 106} 107 108int 109mac_pipe_externalize_label(struct label *label, char *elements, 110 char *outbuf, size_t outbuflen) 111{ 112 int error; 113 114 MAC_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen); 115 116 return (error); 117} 118 119int 120mac_pipe_internalize_label(struct label *label, char *string) 121{ 122 int error; 123 124 MAC_INTERNALIZE(pipe, label, string); 125 126 return (error); 127} 128 129void 130mac_pipe_create(struct ucred *cred, struct pipepair *pp) 131{ 132 133 MAC_PERFORM_NOSLEEP(pipe_create, cred, pp, pp->pp_label); 134} 135 136static void 137mac_pipe_relabel(struct ucred *cred, struct pipepair *pp, 138 struct label *newlabel) 139{ 140 141 MAC_PERFORM_NOSLEEP(pipe_relabel, cred, pp, pp->pp_label, newlabel); 142} 143 144MAC_CHECK_PROBE_DEFINE4(pipe_check_ioctl, "struct ucred *", 145 "struct pipepair *", "unsigned long", "void *"); 146 147int 148mac_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_CHECK_NOSLEEP(pipe_check_ioctl, cred, pp, pp->pp_label, cmd, 156 data); 157 MAC_CHECK_PROBE4(pipe_check_ioctl, error, cred, pp, cmd, data); 158 159 return (error); 160} 161 162MAC_CHECK_PROBE_DEFINE2(pipe_check_poll, "struct ucred *", 163 "struct pipepair *"); 164 165int 166mac_pipe_check_poll(struct ucred *cred, struct pipepair *pp) 167{ 168 int error; 169 170 mtx_assert(&pp->pp_mtx, MA_OWNED); 171 172 MAC_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 178MAC_CHECK_PROBE_DEFINE2(pipe_check_read, "struct ucred *", 179 "struct pipepair *"); 180 181int 182mac_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_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 194MAC_CHECK_PROBE_DEFINE3(pipe_check_relabel, "struct ucred *", 195 "struct pipepair *", "struct label *"); 196 197static int 198mac_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_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 212MAC_CHECK_PROBE_DEFINE2(pipe_check_stat, "struct ucred *", 213 "struct pipepair *"); 214 215int 216mac_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_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 228MAC_CHECK_PROBE_DEFINE2(pipe_check_write, "struct ucred *", 229 "struct pipepair *"); 230 231int 232mac_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_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 244int 245mac_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