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: releng/11.0/sys/security/mac/mac_cred.c 299187 2016-05-06 16:59:04Z pfg $");
48
49 #include "opt_mac.h"
50
51 #include <sys/param.h>
52 #include <sys/condvar.h>
53 #include <sys/imgact.h>
54 #include <sys/kernel.h>
55 #include <sys/lock.h>
56 #include <sys/malloc.h>
57 #include <sys/mutex.h>
58 #include <sys/mac.h>
59 #include <sys/proc.h>
60 #include <sys/sbuf.h>
61 #include <sys/sdt.h>
62 #include <sys/systm.h>
63 #include <sys/vnode.h>
64 #include <sys/mount.h>
65 #include <sys/file.h>
66 #include <sys/namei.h>
67 #include <sys/sysctl.h>
68
69 #include <vm/vm.h>
70 #include <vm/pmap.h>
71 #include <vm/vm_map.h>
72 #include <vm/vm_object.h>
73
74 #include <security/mac/mac_framework.h>
75 #include <security/mac/mac_internal.h>
76 #include <security/mac/mac_policy.h>
77
78 struct label *
79 mac_cred_label_alloc(void)
80 {
81 struct label *label;
82
83 label = mac_labelzone_alloc(M_WAITOK);
84 MAC_POLICY_PERFORM(cred_init_label, label);
85 return (label);
86 }
87
88 void
89 mac_cred_init(struct ucred *cred)
90 {
91
92 if (mac_labeled & MPC_OBJECT_CRED)
93 cred->cr_label = mac_cred_label_alloc();
94 else
95 cred->cr_label = NULL;
96 }
97
98 void
99 mac_cred_label_free(struct label *label)
100 {
101
102 MAC_POLICY_PERFORM_NOSLEEP(cred_destroy_label, label);
103 mac_labelzone_free(label);
104 }
105
106 void
107 mac_cred_destroy(struct ucred *cred)
108 {
109
110 if (cred->cr_label != NULL) {
111 mac_cred_label_free(cred->cr_label);
112 cred->cr_label = NULL;
113 }
114 }
115
116 /*
117 * When a thread becomes an NFS server daemon, its credential may need to be
118 * updated to reflect this so that policies can recognize when file system
119 * operations originate from the network.
120 *
121 * At some point, it would be desirable if the credential used for each NFS
122 * RPC could be set based on the RPC context (i.e., source system, etc) to
123 * provide more fine-grained access control.
124 */
125 void
126 mac_cred_associate_nfsd(struct ucred *cred)
127 {
128
129 MAC_POLICY_PERFORM_NOSLEEP(cred_associate_nfsd, cred);
130 }
131
132 /*
133 * Initialize MAC label for the first kernel process, from which other kernel
134 * processes and threads are spawned.
135 */
136 void
137 mac_cred_create_swapper(struct ucred *cred)
138 {
139
140 MAC_POLICY_PERFORM_NOSLEEP(cred_create_swapper, cred);
141 }
142
143 /*
144 * Initialize MAC label for the first userland process, from which other
145 * userland processes and threads are spawned.
146 */
147 void
148 mac_cred_create_init(struct ucred *cred)
149 {
150
151 MAC_POLICY_PERFORM_NOSLEEP(cred_create_init, cred);
152 }
153
154 int
155 mac_cred_externalize_label(struct label *label, char *elements,
156 char *outbuf, size_t outbuflen)
157 {
158 int error;
159
160 MAC_POLICY_EXTERNALIZE(cred, label, elements, outbuf, outbuflen);
161
162 return (error);
163 }
164
165 int
166 mac_cred_internalize_label(struct label *label, char *string)
167 {
168 int error;
169
170 MAC_POLICY_INTERNALIZE(cred, label, string);
171
172 return (error);
173 }
174
175 /*
176 * When a new process is created, its label must be initialized. Generally,
177 * this involves inheritance from the parent process, modulo possible deltas.
178 * This function allows that processing to take place.
179 */
180 void
181 mac_cred_copy(struct ucred *src, struct ucred *dest)
182 {
183
184 MAC_POLICY_PERFORM_NOSLEEP(cred_copy_label, src->cr_label,
185 dest->cr_label);
186 }
187
188 /*
189 * When the subject's label changes, it may require revocation of privilege
190 * to mapped objects. This can't be done on-the-fly later with a unified
191 * buffer cache.
192 */
193 void
194 mac_cred_relabel(struct ucred *cred, struct label *newlabel)
195 {
196
197 MAC_POLICY_PERFORM_NOSLEEP(cred_relabel, cred, newlabel);
198 }
199
200 MAC_CHECK_PROBE_DEFINE2(cred_check_relabel, "struct ucred *",
201 "struct label *");
202
203 int
204 mac_cred_check_relabel(struct ucred *cred, struct label *newlabel)
205 {
206 int error;
207
208 MAC_POLICY_CHECK_NOSLEEP(cred_check_relabel, cred, newlabel);
209 MAC_CHECK_PROBE2(cred_check_relabel, error, cred, newlabel);
210
211 return (error);
212 }
213
214 MAC_CHECK_PROBE_DEFINE2(cred_check_setuid, "struct ucred *", "uid_t");
215
216 int
217 mac_cred_check_setuid(struct ucred *cred, uid_t uid)
218 {
219 int error;
220
221 MAC_POLICY_CHECK_NOSLEEP(cred_check_setuid, cred, uid);
222 MAC_CHECK_PROBE2(cred_check_setuid, error, cred, uid);
223
224 return (error);
225 }
226
227 MAC_CHECK_PROBE_DEFINE2(cred_check_seteuid, "struct ucred *", "uid_t");
228
229 int
230 mac_cred_check_seteuid(struct ucred *cred, uid_t euid)
231 {
232 int error;
233
234 MAC_POLICY_CHECK_NOSLEEP(cred_check_seteuid, cred, euid);
235 MAC_CHECK_PROBE2(cred_check_seteuid, error, cred, euid);
236
237 return (error);
238 }
239
240 MAC_CHECK_PROBE_DEFINE2(cred_check_setgid, "struct ucred *", "gid_t");
241
242 int
243 mac_cred_check_setgid(struct ucred *cred, gid_t gid)
244 {
245 int error;
246
247 MAC_POLICY_CHECK_NOSLEEP(cred_check_setgid, cred, gid);
248 MAC_CHECK_PROBE2(cred_check_setgid, error, cred, gid);
249
250 return (error);
251 }
252
253 MAC_CHECK_PROBE_DEFINE2(cred_check_setegid, "struct ucred *", "gid_t");
254
255 int
256 mac_cred_check_setegid(struct ucred *cred, gid_t egid)
257 {
258 int error;
259
260 MAC_POLICY_CHECK_NOSLEEP(cred_check_setegid, cred, egid);
261 MAC_CHECK_PROBE2(cred_check_setegid, error, cred, egid);
262
263 return (error);
264 }
265
266 MAC_CHECK_PROBE_DEFINE3(cred_check_setgroups, "struct ucred *", "int",
267 "gid_t *");
268
269 int
270 mac_cred_check_setgroups(struct ucred *cred, int ngroups, gid_t *gidset)
271 {
272 int error;
273
274 MAC_POLICY_CHECK_NOSLEEP(cred_check_setgroups, cred, ngroups, gidset);
275 MAC_CHECK_PROBE3(cred_check_setgroups, error, cred, ngroups, gidset);
276
277 return (error);
278 }
279
280 MAC_CHECK_PROBE_DEFINE3(cred_check_setreuid, "struct ucred *", "uid_t",
281 "uid_t");
282
283 int
284 mac_cred_check_setreuid(struct ucred *cred, uid_t ruid, uid_t euid)
285 {
286 int error;
287
288 MAC_POLICY_CHECK_NOSLEEP(cred_check_setreuid, cred, ruid, euid);
289 MAC_CHECK_PROBE3(cred_check_setreuid, error, cred, ruid, euid);
290
291 return (error);
292 }
293
294 MAC_CHECK_PROBE_DEFINE3(cred_check_setregid, "struct ucred *", "gid_t",
295 "gid_t");
296
297 int
298 mac_cred_check_setregid(struct ucred *cred, gid_t rgid, gid_t egid)
299 {
300 int error;
301
302 MAC_POLICY_CHECK_NOSLEEP(cred_check_setregid, cred, rgid, egid);
303 MAC_CHECK_PROBE3(cred_check_setregid, error, cred, rgid, egid);
304
305 return (error);
306 }
307
308 MAC_CHECK_PROBE_DEFINE4(cred_check_setresuid, "struct ucred *", "uid_t",
309 "uid_t", "uid_t");
310
311 int
312 mac_cred_check_setresuid(struct ucred *cred, uid_t ruid, uid_t euid,
313 uid_t suid)
314 {
315 int error;
316
317 MAC_POLICY_CHECK_NOSLEEP(cred_check_setresuid, cred, ruid, euid, suid);
318 MAC_CHECK_PROBE4(cred_check_setresuid, error, cred, ruid, euid,
319 suid);
320
321 return (error);
322 }
323
324 MAC_CHECK_PROBE_DEFINE4(cred_check_setresgid, "struct ucred *", "gid_t",
325 "gid_t", "gid_t");
326
327 int
328 mac_cred_check_setresgid(struct ucred *cred, gid_t rgid, gid_t egid,
329 gid_t sgid)
330 {
331 int error;
332
333 MAC_POLICY_CHECK_NOSLEEP(cred_check_setresgid, cred, rgid, egid, sgid);
334 MAC_CHECK_PROBE4(cred_check_setresgid, error, cred, rgid, egid,
335 sgid);
336
337 return (error);
338 }
339
340 MAC_CHECK_PROBE_DEFINE2(cred_check_visible, "struct ucred *",
341 "struct ucred *");
342
343 int
344 mac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
345 {
346 int error;
347
348 MAC_POLICY_CHECK_NOSLEEP(cred_check_visible, cr1, cr2);
349 MAC_CHECK_PROBE2(cred_check_visible, error, cr1, cr2);
350
351 return (error);
352 }
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