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
62struct label *
63mac_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
72void
73mac_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
82void
83mac_pipe_label_free(struct label *label)
84{
85
86	MAC_POLICY_PERFORM_NOSLEEP(pipe_destroy_label, label);
87	mac_labelzone_free(label);
88}
89
90void
91mac_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
100void
101mac_pipe_copy_label(struct label *src, struct label *dest)
102{
103
104	MAC_POLICY_PERFORM_NOSLEEP(pipe_copy_label, src, dest);
105}
106
107int
108mac_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
118int
119mac_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
128void
129mac_pipe_create(struct ucred *cred, struct pipepair *pp)
130{
131
132	MAC_POLICY_PERFORM_NOSLEEP(pipe_create, cred, pp, pp->pp_label);
133}
134
135static void
136mac_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
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_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
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_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
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_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
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_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
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_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
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_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
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