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 | int |
51 | mac_file_check_create(struct ucred *cred) |
52 | { |
53 | int error; |
54 | |
55 | MAC_CHECK(file_check_create, cred); |
56 | return error; |
57 | } |
58 | |
59 | int |
60 | mac_file_check_dup(struct ucred *cred, struct fileglob *fg, int newfd) |
61 | { |
62 | int error; |
63 | |
64 | MAC_CHECK(file_check_dup, cred, fg, NULL, newfd); |
65 | return error; |
66 | } |
67 | |
68 | int |
69 | mac_file_check_fcntl(struct ucred *cred, struct fileglob *fg, int cmd, |
70 | user_long_t arg) |
71 | { |
72 | int error; |
73 | |
74 | MAC_CHECK(file_check_fcntl, cred, fg, NULL, cmd, arg); |
75 | return error; |
76 | } |
77 | |
78 | int |
79 | mac_file_check_ioctl(struct ucred *cred, struct fileglob *fg, u_long cmd) |
80 | { |
81 | int error; |
82 | |
83 | MAC_CHECK(file_check_ioctl, cred, fg, NULL, cmd); |
84 | return error; |
85 | } |
86 | |
87 | int |
88 | mac_file_check_inherit(struct ucred *cred, struct fileglob *fg) |
89 | { |
90 | int error; |
91 | |
92 | MAC_CHECK(file_check_inherit, cred, fg, NULL); |
93 | return error; |
94 | } |
95 | |
96 | int |
97 | mac_file_check_receive(struct ucred *cred, struct fileglob *fg) |
98 | { |
99 | int error; |
100 | |
101 | MAC_CHECK(file_check_receive, cred, fg, NULL); |
102 | return error; |
103 | } |
104 | |
105 | int |
106 | mac_file_check_get_offset(struct ucred *cred, struct fileglob *fg) |
107 | { |
108 | int error; |
109 | |
110 | MAC_CHECK(file_check_get_offset, cred, fg, NULL); |
111 | return error; |
112 | } |
113 | |
114 | int |
115 | mac_file_check_change_offset(struct ucred *cred, struct fileglob *fg) |
116 | { |
117 | int error; |
118 | |
119 | MAC_CHECK(file_check_change_offset, cred, fg, NULL); |
120 | return error; |
121 | } |
122 | |
123 | int |
124 | mac_file_check_get(struct ucred *cred, struct fileglob *fg, char *elements, |
125 | size_t len) |
126 | { |
127 | int error; |
128 | |
129 | MAC_CHECK(file_check_get, cred, fg, elements, len); |
130 | return error; |
131 | } |
132 | |
133 | int |
134 | mac_file_check_set(struct ucred *cred, struct fileglob *fg, char *buf, |
135 | size_t buflen) |
136 | { |
137 | int error; |
138 | |
139 | MAC_CHECK(file_check_set, cred, fg, buf, buflen); |
140 | return error; |
141 | } |
142 | |
143 | int |
144 | mac_file_check_lock(struct ucred *cred, struct fileglob *fg, int op, |
145 | struct flock *fl) |
146 | { |
147 | int error; |
148 | |
149 | MAC_CHECK(file_check_lock, cred, fg, NULL, op, fl); |
150 | return error; |
151 | } |
152 | |
153 | int |
154 | mac_file_check_library_validation(struct proc *proc, |
155 | struct fileglob *fg, off_t slice_offset, |
156 | user_long_t error_message, size_t error_message_size) |
157 | { |
158 | int error; |
159 | |
160 | MAC_CHECK(file_check_library_validation, proc, fg, slice_offset, error_message, error_message_size); |
161 | return error; |
162 | } |
163 | |
164 | /* |
165 | * On some platforms, VM_PROT_READ implies VM_PROT_EXECUTE. If that is true, |
166 | * both prot and maxprot will have VM_PROT_EXECUTE set after file_check_mmap |
167 | * if VM_PROT_READ is set. |
168 | * |
169 | * The type of maxprot in file_check_mmap must be equivalent to vm_prot_t * |
170 | * (defined in <mach/vm_prot.h>). mac_policy.h does not include any header |
171 | * files, so cannot use the typedef itself. |
172 | */ |
173 | int |
174 | mac_file_check_mmap(struct ucred *cred, struct fileglob *fg, int prot, |
175 | int flags, uint64_t offset, int *maxprot) |
176 | { |
177 | int error; |
178 | int maxp; |
179 | |
180 | maxp = *maxprot; |
181 | MAC_CHECK(file_check_mmap, cred, fg, NULL, prot, flags, offset, &maxp); |
182 | if ((maxp | *maxprot) != *maxprot) { |
183 | panic("file_check_mmap increased max protections" ); |
184 | } |
185 | *maxprot = maxp; |
186 | return error; |
187 | } |
188 | |
189 | void |
190 | mac_file_check_mmap_downgrade(struct ucred *cred, struct fileglob *fg, |
191 | int *prot) |
192 | { |
193 | int result = *prot; |
194 | |
195 | MAC_PERFORM(file_check_mmap_downgrade, cred, fg, NULL, &result); |
196 | |
197 | *prot = result; |
198 | } |
199 | |
200 | void |
201 | mac_file_notify_close(struct ucred *cred, struct fileglob *fg) |
202 | { |
203 | MAC_PERFORM(file_notify_close, cred, fg, NULL, ((fg->fg_flag & FWASWRITTEN) ? 1 : 0)); |
204 | } |
205 | |
206 | |
207 | /* |
208 | * fileglob XATTR helpers. |
209 | */ |
210 | |
211 | int |
212 | mac_file_setxattr(struct fileglob *fg, const char *name, char *buf, size_t len) |
213 | { |
214 | struct vnode *vp = NULL; |
215 | |
216 | if (!fg || FILEGLOB_DTYPE(fg) != DTYPE_VNODE) { |
217 | return EFTYPE; |
218 | } |
219 | |
220 | vp = (struct vnode *)fg_get_data(fg); |
221 | int error = vnode_getwithref(vp); |
222 | if (error) { |
223 | return error; |
224 | } |
225 | error = mac_vnop_setxattr(vp, name, buf, len); |
226 | vnode_put(vp); |
227 | return error; |
228 | } |
229 | |
230 | int |
231 | mac_file_getxattr(struct fileglob *fg, const char *name, char *buf, size_t len, |
232 | size_t *attrlen) |
233 | { |
234 | struct vnode *vp = NULL; |
235 | |
236 | if (!fg || FILEGLOB_DTYPE(fg) != DTYPE_VNODE) { |
237 | return EFTYPE; |
238 | } |
239 | |
240 | vp = (struct vnode *)fg_get_data(fg); |
241 | int error = vnode_getwithref(vp); |
242 | if (error) { |
243 | return error; |
244 | } |
245 | error = mac_vnop_getxattr(vp, name, buf, len, attrlen); |
246 | vnode_put(vp); |
247 | return error; |
248 | } |
249 | |
250 | int |
251 | mac_file_removexattr(struct fileglob *fg, const char *name) |
252 | { |
253 | struct vnode *vp = NULL; |
254 | |
255 | if (!fg || FILEGLOB_DTYPE(fg) != DTYPE_VNODE) { |
256 | return EFTYPE; |
257 | } |
258 | |
259 | vp = (struct vnode *)fg_get_data(fg); |
260 | int error = vnode_getwithref(vp); |
261 | if (error) { |
262 | return error; |
263 | } |
264 | error = mac_vnop_removexattr(vp, name); |
265 | vnode_put(vp); |
266 | return error; |
267 | } |
268 | |