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
196int
197mac_file_check_library_validation(struct proc *proc,
198 struct fileglob *fg, off_t slice_offset,
199 user_long_t error_message, size_t error_message_size)
200{
201 int error;
202
203 MAC_CHECK(file_check_library_validation, proc, fg, slice_offset, error_message, error_message_size);
204 return (error);
205}
206
207/*
208 * On some platforms, VM_PROT_READ implies VM_PROT_EXECUTE. If that is true,
209 * both prot and maxprot will have VM_PROT_EXECUTE set after file_check_mmap
210 * if VM_PROT_READ is set.
211 *
212 * The type of maxprot in file_check_mmap must be equivalent to vm_prot_t *
213 * (defined in <mach/vm_prot.h>). mac_policy.h does not include any header
214 * files, so cannot use the typedef itself.
215 */
216int
217mac_file_check_mmap(struct ucred *cred, struct fileglob *fg, int prot,
218 int flags, uint64_t offset, int *maxprot)
219{
220 int error;
221 int maxp;
222
223 maxp = *maxprot;
224 MAC_CHECK(file_check_mmap, cred, fg, fg->fg_label, prot, flags, offset, &maxp);
225 if ((maxp | *maxprot) != *maxprot)
226 panic("file_check_mmap increased max protections");
227 *maxprot = maxp;
228 return (error);
229}
230
231void
232mac_file_check_mmap_downgrade(struct ucred *cred, struct fileglob *fg,
233 int *prot)
234{
235 int result = *prot;
236
237 MAC_PERFORM(file_check_mmap_downgrade, cred, fg, fg->fg_label,
238 &result);
239
240 *prot = result;
241}
242
243
244/*
245 * fileglob XATTR helpers.
246 */
247
248int
249mac_file_setxattr(struct fileglob *fg, const char *name, char *buf, size_t len) {
250 struct vnode *vp = NULL;
251
252 if (!fg || FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
253 return EFTYPE;
254 }
255
256 vp = (struct vnode *)fg->fg_data;
257 return mac_vnop_setxattr(vp, name, buf, len);
258}
259
260int
261mac_file_getxattr(struct fileglob *fg, const char *name, char *buf, size_t len,
262 size_t *attrlen) {
263 struct vnode *vp = NULL;
264
265 if (!fg || FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
266 return EFTYPE;
267 }
268
269 vp = (struct vnode *)fg->fg_data;
270 return mac_vnop_getxattr(vp, name, buf, len, attrlen);
271}
272
273int
274mac_file_removexattr(struct fileglob *fg, const char *name) {
275 struct vnode *vp = NULL;
276
277 if (!fg || FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
278 return EFTYPE;
279 }
280
281 vp = (struct vnode *)fg->fg_data;
282 return mac_vnop_removexattr(vp, name);
283}
284