1/*-
2 * Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2006 SPARTA, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project in part by Network
7 * Associates Laboratories, the Security Research Division of Network
8 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
9 * as part of the DARPA CHATS research program.
10 *
11 * This software was enhanced by SPARTA ISSO under SPAWAR contract
12 * N66001-04-C-6019 ("SEFOS").
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/param.h>
37#include <sys/kernel.h>
38#include <sys/lock.h>
39#include <sys/malloc.h>
40#include <sys/proc.h>
41#include <sys/sbuf.h>
42#include <sys/systm.h>
43#include <sys/vnode.h>
44#include <sys/vnode_internal.h>
45#include <sys/file.h>
46#include <sys/file_internal.h>
47
48#include <security/mac_internal.h>
49
50
51static struct label *
52mac_file_label_alloc(void)
53{
54	struct label *label;
55
56	label = mac_labelzone_alloc(MAC_WAITOK);
57	if (label == NULL)
58		return (NULL);
59	MAC_PERFORM(file_label_init, label);
60	return (label);
61}
62
63void
64mac_file_label_init(struct fileglob *fg)
65{
66
67	fg->fg_label = mac_file_label_alloc();
68}
69
70static void
71mac_file_label_free(struct label *label)
72{
73
74	MAC_PERFORM(file_label_destroy, label);
75	mac_labelzone_free(label);
76}
77
78void
79mac_file_label_associate(struct ucred *cred, struct fileglob *fg)
80{
81
82	MAC_PERFORM(file_label_associate, cred, fg, fg->fg_label);
83}
84
85void
86mac_file_label_destroy(struct fileglob *fg)
87{
88
89	mac_file_label_free(fg->fg_label);
90	fg->fg_label = NULL;
91}
92
93int
94mac_file_check_create(struct ucred *cred)
95{
96	int error;
97
98	MAC_CHECK(file_check_create, cred);
99	return (error);
100}
101
102int
103mac_file_check_dup(struct ucred *cred, struct fileglob *fg, int newfd)
104{
105	int error;
106
107	MAC_CHECK(file_check_dup, cred, fg, fg->fg_label, newfd);
108	return (error);
109}
110
111int
112mac_file_check_fcntl(struct ucred *cred, struct fileglob *fg, int cmd,
113    user_long_t arg)
114{
115	int error;
116
117	MAC_CHECK(file_check_fcntl, cred, fg, fg->fg_label, cmd, arg);
118	return (error);
119}
120
121int
122mac_file_check_ioctl(struct ucred *cred, struct fileglob *fg, u_int cmd)
123{
124	int error;
125
126	MAC_CHECK(file_check_ioctl, cred, fg, fg->fg_label, cmd);
127	return (error);
128}
129
130int
131mac_file_check_inherit(struct ucred *cred, struct fileglob *fg)
132{
133	int error;
134
135	MAC_CHECK(file_check_inherit, cred, fg, fg->fg_label);
136	return (error);
137}
138
139int
140mac_file_check_receive(struct ucred *cred, struct fileglob *fg)
141{
142	int error;
143
144	MAC_CHECK(file_check_receive, cred, fg, fg->fg_label);
145	return (error);
146}
147
148int
149mac_file_check_get_offset(struct ucred *cred, struct fileglob *fg)
150{
151	int error;
152
153	MAC_CHECK(file_check_get_offset, cred, fg, fg->fg_label);
154	return (error);
155}
156
157int
158mac_file_check_change_offset(struct ucred *cred, struct fileglob *fg)
159{
160	int error;
161
162	MAC_CHECK(file_check_change_offset, cred, fg, fg->fg_label);
163	return (error);
164}
165
166int
167mac_file_check_get(struct ucred *cred, struct fileglob *fg, char *elements,
168    int len)
169{
170	int error;
171
172	MAC_CHECK(file_check_get, cred, fg, elements, len);
173	return (error);
174}
175
176int
177mac_file_check_set(struct ucred *cred, struct fileglob *fg, char *buf,
178    int buflen)
179{
180	int error;
181
182	MAC_CHECK(file_check_set, cred, fg, buf, buflen);
183	return (error);
184}
185
186int
187mac_file_check_lock(struct ucred *cred, struct fileglob *fg, int op,
188    struct flock *fl)
189{
190	int error;
191
192	MAC_CHECK(file_check_lock, cred, fg, fg->fg_label, op, fl);
193	return (error);
194}
195
196/*
197 * On some platforms, VM_PROT_READ implies VM_PROT_EXECUTE. If that is true,
198 * both prot and maxprot will have VM_PROT_EXECUTE set after file_check_mmap
199 * if VM_PROT_READ is set.
200 *
201 * The type of maxprot in file_check_mmap must be equivalent to vm_prot_t *
202 * (defined in <mach/vm_prot.h>). mac_policy.h does not include any header
203 * files, so cannot use the typedef itself.
204 */
205int
206mac_file_check_mmap(struct ucred *cred, struct fileglob *fg, int prot,
207    int flags, int *maxprot)
208{
209	int error;
210	int maxp;
211
212	maxp = *maxprot;
213	MAC_CHECK(file_check_mmap, cred, fg, fg->fg_label, prot, flags, &maxp);
214	if ((maxp | *maxprot) != *maxprot)
215		panic("file_check_mmap increased max protections");
216	*maxprot = maxp;
217	return (error);
218}
219
220void
221mac_file_check_mmap_downgrade(struct ucred *cred, struct fileglob *fg,
222    int *prot)
223{
224	int result = *prot;
225
226	MAC_PERFORM(file_check_mmap_downgrade, cred, fg, fg->fg_label,
227	    &result);
228
229	*prot = result;
230}
231