1 /*-
2 * Copyright (c) 1999-2002, 2008-2009 Robert N. M. Watson
3 * Copyright (c) 2001 Ilmar S. Habibulin
4 * Copyright (c) 2001-2003 Networks Associates Technology, Inc.
5 * Copyright (c) 2005 Samy Al Bahra
6 * Copyright (c) 2006 SPARTA, Inc.
7 * Copyright (c) 2008 Apple Inc.
8 * All rights reserved.
9 *
10 * This software was developed by Robert Watson and Ilmar Habibulin for the
11 * TrustedBSD Project.
12 *
13 * This software was developed for the FreeBSD Project in part by Network
14 * Associates Laboratories, the Security Research Division of Network
15 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
16 * as part of the DARPA CHATS research program.
17 *
18 * This software was enhanced by SPARTA ISSO under SPAWAR contract
19 * N66001-04-C-6019 ("SEFOS").
20 *
21 * This software was developed at the University of Cambridge Computer
22 * Laboratory with support from a grant from Google, Inc.
23 *
24 * Redistribution and use in source and binary forms, with or without
25 * modification, are permitted provided that the following conditions
26 * are met:
27 * 1. Redistributions of source code must retain the above copyright
28 * notice, this list of conditions and the following disclaimer.
29 * 2. Redistributions in binary form must reproduce the above copyright
30 * notice, this list of conditions and the following disclaimer in the
31 * documentation and/or other materials provided with the distribution.
32 *
33 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
34 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
35 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
36 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
37 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
41 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
42 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 * SUCH DAMAGE.
44 */
45
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
48
49 #include "opt_kdtrace.h"
50 #include "opt_mac.h"
51
52 #include <sys/param.h>
53 #include <sys/condvar.h>
54 #include <sys/imgact.h>
55 #include <sys/kernel.h>
56 #include <sys/lock.h>
57 #include <sys/malloc.h>
58 #include <sys/mutex.h>
59 #include <sys/mac.h>
60 #include <sys/proc.h>
61 #include <sys/sbuf.h>
62 #include <sys/sdt.h>
63 #include <sys/systm.h>
64 #include <sys/vnode.h>
65 #include <sys/mount.h>
66 #include <sys/file.h>
67 #include <sys/namei.h>
68 #include <sys/sysctl.h>
69
70 #include <vm/vm.h>
71 #include <vm/pmap.h>
72 #include <vm/vm_map.h>
73 #include <vm/vm_object.h>
74
75 #include <security/mac/mac_framework.h>
76 #include <security/mac/mac_internal.h>
77 #include <security/mac/mac_policy.h>
78
79 struct label *
80 mac_cred_label_alloc(void)
81 {
82 struct label *label;
83
84 label = mac_labelzone_alloc(M_WAITOK);
85 MAC_POLICY_PERFORM(cred_init_label, label);
86 return (label);
87 }
88
89 void
90 mac_cred_init(struct ucred *cred)
91 {
92
93 if (mac_labeled & MPC_OBJECT_CRED)
94 cred->cr_label = mac_cred_label_alloc();
95 else
96 cred->cr_label = NULL;
97 }
98
99 void
100 mac_cred_label_free(struct label *label)
101 {
102
103 MAC_POLICY_PERFORM_NOSLEEP(cred_destroy_label, label);
104 mac_labelzone_free(label);
105 }
106
107 void
108 mac_cred_destroy(struct ucred *cred)
109 {
110
111 if (cred->cr_label != NULL) {
112 mac_cred_label_free(cred->cr_label);
113 cred->cr_label = NULL;
114 }
115 }
116
117 /*
118 * When a thread becomes an NFS server daemon, its credential may need to be
119 * updated to reflect this so that policies can recognize when file system
120 * operations originate from the network.
121 *
122 * At some point, it would be desirable if the credential used for each NFS
123 * RPC could be set based on the RPC context (i.e., source system, etc) to
124 * provide more fine-grained access control.
125 */
126 void
127 mac_cred_associate_nfsd(struct ucred *cred)
128 {
129
130 MAC_POLICY_PERFORM_NOSLEEP(cred_associate_nfsd, cred);
131 }
132
133 /*
134 * Initialize MAC label for the first kernel process, from which other kernel
135 * processes and threads are spawned.
136 */
137 void
138 mac_cred_create_swapper(struct ucred *cred)
139 {
140
141 MAC_POLICY_PERFORM_NOSLEEP(cred_create_swapper, cred);
142 }
143
144 /*
145 * Initialize MAC label for the first userland process, from which other
146 * userland processes and threads are spawned.
147 */
148 void
149 mac_cred_create_init(struct ucred *cred)
150 {
151
152 MAC_POLICY_PERFORM_NOSLEEP(cred_create_init, cred);
153 }
154
155 int
156 mac_cred_externalize_label(struct label *label, char *elements,
157 char *outbuf, size_t outbuflen)
158 {
159 int error;
160
161 MAC_POLICY_EXTERNALIZE(cred, label, elements, outbuf, outbuflen);
162
163 return (error);
164 }
165
166 int
167 mac_cred_internalize_label(struct label *label, char *string)
168 {
169 int error;
170
171 MAC_POLICY_INTERNALIZE(cred, label, string);
172
173 return (error);
174 }
175
176 /*
177 * When a new process is created, its label must be initialized. Generally,
178 * this involves inheritence from the parent process, modulo possible deltas.
179 * This function allows that processing to take place.
180 */
181 void
182 mac_cred_copy(struct ucred *src, struct ucred *dest)
183 {
184
185 MAC_POLICY_PERFORM_NOSLEEP(cred_copy_label, src->cr_label,
186 dest->cr_label);
187 }
188
189 /*
190 * When the subject's label changes, it may require revocation of privilege
191 * to mapped objects. This can't be done on-the-fly later with a unified
192 * buffer cache.
193 */
194 void
195 mac_cred_relabel(struct ucred *cred, struct label *newlabel)
196 {
197
198 MAC_POLICY_PERFORM_NOSLEEP(cred_relabel, cred, newlabel);
199 }
200
201 MAC_CHECK_PROBE_DEFINE2(cred_check_relabel, "struct ucred *",
202 "struct label *");
203
204 int
205 mac_cred_check_relabel(struct ucred *cred, struct label *newlabel)
206 {
207 int error;
208
209 MAC_POLICY_CHECK_NOSLEEP(cred_check_relabel, cred, newlabel);
210 MAC_CHECK_PROBE2(cred_check_relabel, error, cred, newlabel);
211
212 return (error);
213 }
214
215 MAC_CHECK_PROBE_DEFINE2(cred_check_setuid, "struct ucred *", "uid_t");
216
217 int
218 mac_cred_check_setuid(struct ucred *cred, uid_t uid)
219 {
220 int error;
221
222 MAC_POLICY_CHECK_NOSLEEP(cred_check_setuid, cred, uid);
223 MAC_CHECK_PROBE2(cred_check_setuid, error, cred, uid);
224
225 return (error);
226 }
227
228 MAC_CHECK_PROBE_DEFINE2(cred_check_seteuid, "struct ucred *", "uid_t");
229
230 int
231 mac_cred_check_seteuid(struct ucred *cred, uid_t euid)
232 {
233 int error;
234
235 MAC_POLICY_CHECK_NOSLEEP(cred_check_seteuid, cred, euid);
236 MAC_CHECK_PROBE2(cred_check_seteuid, error, cred, euid);
237
238 return (error);
239 }
240
241 MAC_CHECK_PROBE_DEFINE2(cred_check_setgid, "struct ucred *", "gid_t");
242
243 int
244 mac_cred_check_setgid(struct ucred *cred, gid_t gid)
245 {
246 int error;
247
248 MAC_POLICY_CHECK_NOSLEEP(cred_check_setgid, cred, gid);
249 MAC_CHECK_PROBE2(cred_check_setgid, error, cred, gid);
250
251 return (error);
252 }
253
254 MAC_CHECK_PROBE_DEFINE2(cred_check_setegid, "struct ucred *", "gid_t");
255
256 int
257 mac_cred_check_setegid(struct ucred *cred, gid_t egid)
258 {
259 int error;
260
261 MAC_POLICY_CHECK_NOSLEEP(cred_check_setegid, cred, egid);
262 MAC_CHECK_PROBE2(cred_check_setegid, error, cred, egid);
263
264 return (error);
265 }
266
267 MAC_CHECK_PROBE_DEFINE3(cred_check_setgroups, "struct ucred *", "int",
268 "gid_t *");
269
270 int
271 mac_cred_check_setgroups(struct ucred *cred, int ngroups, gid_t *gidset)
272 {
273 int error;
274
275 MAC_POLICY_CHECK_NOSLEEP(cred_check_setgroups, cred, ngroups, gidset);
276 MAC_CHECK_PROBE3(cred_check_setgroups, error, cred, ngroups, gidset);
277
278 return (error);
279 }
280
281 MAC_CHECK_PROBE_DEFINE3(cred_check_setreuid, "struct ucred *", "uid_t",
282 "uid_t");
283
284 int
285 mac_cred_check_setreuid(struct ucred *cred, uid_t ruid, uid_t euid)
286 {
287 int error;
288
289 MAC_POLICY_CHECK_NOSLEEP(cred_check_setreuid, cred, ruid, euid);
290 MAC_CHECK_PROBE3(cred_check_setreuid, error, cred, ruid, euid);
291
292 return (error);
293 }
294
295 MAC_CHECK_PROBE_DEFINE3(cred_check_setregid, "struct ucred *", "gid_t",
296 "gid_t");
297
298 int
299 mac_cred_check_setregid(struct ucred *cred, gid_t rgid, gid_t egid)
300 {
301 int error;
302
303 MAC_POLICY_CHECK_NOSLEEP(cred_check_setregid, cred, rgid, egid);
304 MAC_CHECK_PROBE3(cred_check_setregid, error, cred, rgid, egid);
305
306 return (error);
307 }
308
309 MAC_CHECK_PROBE_DEFINE4(cred_check_setresuid, "struct ucred *", "uid_t",
310 "uid_t", "uid_t");
311
312 int
313 mac_cred_check_setresuid(struct ucred *cred, uid_t ruid, uid_t euid,
314 uid_t suid)
315 {
316 int error;
317
318 MAC_POLICY_CHECK_NOSLEEP(cred_check_setresuid, cred, ruid, euid, suid);
319 MAC_CHECK_PROBE4(cred_check_setresuid, error, cred, ruid, euid,
320 suid);
321
322 return (error);
323 }
324
325 MAC_CHECK_PROBE_DEFINE4(cred_check_setresgid, "struct ucred *", "gid_t",
326 "gid_t", "gid_t");
327
328 int
329 mac_cred_check_setresgid(struct ucred *cred, gid_t rgid, gid_t egid,
330 gid_t sgid)
331 {
332 int error;
333
334 MAC_POLICY_CHECK_NOSLEEP(cred_check_setresgid, cred, rgid, egid, sgid);
335 MAC_CHECK_PROBE4(cred_check_setresgid, error, cred, rgid, egid,
336 sgid);
337
338 return (error);
339 }
340
341 MAC_CHECK_PROBE_DEFINE2(cred_check_visible, "struct ucred *",
342 "struct ucred *");
343
344 int
345 mac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
346 {
347 int error;
348
349 MAC_POLICY_CHECK_NOSLEEP(cred_check_visible, cr1, cr2);
350 MAC_CHECK_PROBE2(cred_check_visible, error, cr1, cr2);
351
352 return (error);
353 }
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