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 | |
51 | static struct label * |
52 | mac_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 | |
63 | void |
64 | mac_file_label_init(struct fileglob *fg) |
65 | { |
66 | |
67 | fg->fg_label = mac_file_label_alloc(); |
68 | } |
69 | |
70 | static void |
71 | mac_file_label_free(struct label *label) |
72 | { |
73 | |
74 | MAC_PERFORM(file_label_destroy, label); |
75 | mac_labelzone_free(label); |
76 | } |
77 | |
78 | void |
79 | mac_file_label_associate(struct ucred *cred, struct fileglob *fg) |
80 | { |
81 | |
82 | MAC_PERFORM(file_label_associate, cred, fg, fg->fg_label); |
83 | } |
84 | |
85 | void |
86 | mac_file_label_destroy(struct fileglob *fg) |
87 | { |
88 | |
89 | mac_file_label_free(fg->fg_label); |
90 | fg->fg_label = NULL; |
91 | } |
92 | |
93 | int |
94 | mac_file_check_create(struct ucred *cred) |
95 | { |
96 | int error; |
97 | |
98 | MAC_CHECK(file_check_create, cred); |
99 | return (error); |
100 | } |
101 | |
102 | int |
103 | mac_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 | |
111 | int |
112 | mac_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 | |
121 | int |
122 | mac_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 | |
130 | int |
131 | mac_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 | |
139 | int |
140 | mac_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 | |
148 | int |
149 | mac_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 | |
157 | int |
158 | mac_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 | |
166 | int |
167 | mac_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 | |
176 | int |
177 | mac_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 | |
186 | int |
187 | mac_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 | int |
197 | mac_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 | */ |
216 | int |
217 | mac_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 | |
231 | void |
232 | mac_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 | |
248 | int |
249 | mac_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 | |
260 | int |
261 | mac_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 | |
273 | int |
274 | mac_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 | |