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
63struct label *
64mac_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
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_POLICY_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_POLICY_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_POLICY_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_POLICY_INTERNALIZE(pipe, label, string);
125
126	return (error);
127}
128
129void
130mac_pipe_create(struct ucred *cred, struct pipepair *pp)
131{
132
133	MAC_POLICY_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_POLICY_PERFORM_NOSLEEP(pipe_relabel, cred, pp, pp->pp_label,
142	    newlabel);
143}
144
145MAC_CHECK_PROBE_DEFINE4(pipe_check_ioctl, "struct ucred *",
146    "struct pipepair *", "unsigned long", "void *");
147
148int
149mac_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
163MAC_CHECK_PROBE_DEFINE2(pipe_check_poll, "struct ucred *",
164    "struct pipepair *");
165
166int
167mac_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
179MAC_CHECK_PROBE_DEFINE2(pipe_check_read, "struct ucred *",
180    "struct pipepair *");
181
182int
183mac_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
195MAC_CHECK_PROBE_DEFINE3(pipe_check_relabel, "struct ucred *",
196    "struct pipepair *", "struct label *");
197
198static int
199mac_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
213MAC_CHECK_PROBE_DEFINE2(pipe_check_stat, "struct ucred *",
214    "struct pipepair *");
215
216int
217mac_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
229MAC_CHECK_PROBE_DEFINE2(pipe_check_write, "struct ucred *",
230    "struct pipepair *");
231
232int
233mac_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
245int
246mac_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