1 /*-
2 * Copyright (c) 1999-2002 Robert N. M. Watson
3 * Copyright (c) 2001-2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed by Robert Watson for the TrustedBSD Project.
7 *
8 * This software was developed for the FreeBSD Project in part by Network
9 * Associates Laboratories, the Security Research Division of Network
10 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
11 * as part of the DARPA CHATS research program.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $FreeBSD: releng/6.2/sys/security/mac_partition/mac_partition.c 150569 2005-09-26 14:36:54Z phk $
35 */
36
37 /*
38 * Developed by the TrustedBSD Project.
39 * Experiment with a partition-like model.
40 */
41
42 #include <sys/types.h>
43 #include <sys/param.h>
44 #include <sys/conf.h>
45 #include <sys/kernel.h>
46 #include <sys/mac.h>
47 #include <sys/mount.h>
48 #include <sys/proc.h>
49 #include <sys/sbuf.h>
50 #include <sys/systm.h>
51 #include <sys/sysproto.h>
52 #include <sys/sysent.h>
53 #include <sys/vnode.h>
54 #include <sys/file.h>
55 #include <sys/socket.h>
56 #include <sys/socketvar.h>
57 #include <sys/sx.h>
58 #include <sys/sysctl.h>
59
60 #include <fs/devfs/devfs.h>
61
62 #include <net/bpfdesc.h>
63 #include <net/if.h>
64 #include <net/if_types.h>
65 #include <net/if_var.h>
66
67 #include <vm/vm.h>
68
69 #include <sys/mac_policy.h>
70
71 #include <security/mac_partition/mac_partition.h>
72
73 SYSCTL_DECL(_security_mac);
74
75 SYSCTL_NODE(_security_mac, OID_AUTO, partition, CTLFLAG_RW, 0,
76 "TrustedBSD mac_partition policy controls");
77
78 static int mac_partition_enabled = 1;
79 SYSCTL_INT(_security_mac_partition, OID_AUTO, enabled, CTLFLAG_RW,
80 &mac_partition_enabled, 0, "Enforce partition policy");
81
82 static int partition_slot;
83 #define SLOT(l) (LABEL_TO_SLOT((l), partition_slot).l_long)
84
85 static void
86 mac_partition_init(struct mac_policy_conf *conf)
87 {
88
89 }
90
91 static void
92 mac_partition_init_label(struct label *label)
93 {
94
95 SLOT(label) = 0;
96 }
97
98 static void
99 mac_partition_destroy_label(struct label *label)
100 {
101
102 SLOT(label) = 0;
103 }
104
105 static void
106 mac_partition_copy_label(struct label *src, struct label *dest)
107 {
108
109 SLOT(dest) = SLOT(src);
110 }
111
112 static int
113 mac_partition_externalize_label(struct label *label, char *element_name,
114 struct sbuf *sb, int *claimed)
115 {
116
117 if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0)
118 return (0);
119
120 (*claimed)++;
121
122 if (sbuf_printf(sb, "%ld", SLOT(label)) == -1)
123 return (EINVAL);
124 else
125 return (0);
126 }
127
128 static int
129 mac_partition_internalize_label(struct label *label, char *element_name,
130 char *element_data, int *claimed)
131 {
132
133 if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0)
134 return (0);
135
136 (*claimed)++;
137 SLOT(label) = strtol(element_data, NULL, 10);
138 return (0);
139 }
140
141 static void
142 mac_partition_create_proc0(struct ucred *cred)
143 {
144
145 SLOT(cred->cr_label) = 0;
146 }
147
148 static void
149 mac_partition_create_proc1(struct ucred *cred)
150 {
151
152 SLOT(cred->cr_label) = 0;
153 }
154
155 static void
156 mac_partition_relabel_cred(struct ucred *cred, struct label *newlabel)
157 {
158
159 if (SLOT(newlabel) != 0)
160 SLOT(cred->cr_label) = SLOT(newlabel);
161 }
162
163 static int
164 label_on_label(struct label *subject, struct label *object)
165 {
166
167 if (mac_partition_enabled == 0)
168 return (0);
169
170 if (SLOT(subject) == 0)
171 return (0);
172
173 if (SLOT(subject) == SLOT(object))
174 return (0);
175
176 return (EPERM);
177 }
178
179 static int
180 mac_partition_check_cred_relabel(struct ucred *cred, struct label *newlabel)
181 {
182 int error;
183
184 error = 0;
185
186 /* Treat "" as a no-op request. */
187 if (SLOT(newlabel) != 0) {
188 /*
189 * Require BSD privilege in order to change the partition.
190 * Originally we also required that the process not be
191 * in a partition in the first place, but this didn't
192 * interact well with sendmail.
193 */
194 error = suser_cred(cred, 0);
195 }
196
197 return (error);
198 }
199
200 static int
201 mac_partition_check_cred_visible(struct ucred *u1, struct ucred *u2)
202 {
203 int error;
204
205 error = label_on_label(u1->cr_label, u2->cr_label);
206
207 return (error == 0 ? 0 : ESRCH);
208 }
209
210 static int
211 mac_partition_check_proc_debug(struct ucred *cred, struct proc *proc)
212 {
213 int error;
214
215 error = label_on_label(cred->cr_label, proc->p_ucred->cr_label);
216
217 return (error ? ESRCH : 0);
218 }
219
220 static int
221 mac_partition_check_proc_sched(struct ucred *cred, struct proc *proc)
222 {
223 int error;
224
225 error = label_on_label(cred->cr_label, proc->p_ucred->cr_label);
226
227 return (error ? ESRCH : 0);
228 }
229
230 static int
231 mac_partition_check_proc_signal(struct ucred *cred, struct proc *proc,
232 int signum)
233 {
234 int error;
235
236 error = label_on_label(cred->cr_label, proc->p_ucred->cr_label);
237
238 return (error ? ESRCH : 0);
239 }
240
241 static int
242 mac_partition_check_socket_visible(struct ucred *cred, struct socket *socket,
243 struct label *socketlabel)
244 {
245 int error;
246
247 error = label_on_label(cred->cr_label, socketlabel);
248
249 return (error ? ENOENT : 0);
250 }
251
252 static int
253 mac_partition_check_vnode_exec(struct ucred *cred, struct vnode *vp,
254 struct label *label, struct image_params *imgp, struct label *execlabel)
255 {
256
257 if (execlabel != NULL) {
258 /*
259 * We currently don't permit labels to be changed at
260 * exec-time as part of the partition model, so disallow
261 * non-NULL partition label changes in execlabel.
262 */
263 if (SLOT(execlabel) != 0)
264 return (EINVAL);
265 }
266
267 return (0);
268 }
269
270 static struct mac_policy_ops mac_partition_ops =
271 {
272 .mpo_init = mac_partition_init,
273 .mpo_init_cred_label = mac_partition_init_label,
274 .mpo_destroy_cred_label = mac_partition_destroy_label,
275 .mpo_copy_cred_label = mac_partition_copy_label,
276 .mpo_externalize_cred_label = mac_partition_externalize_label,
277 .mpo_internalize_cred_label = mac_partition_internalize_label,
278 .mpo_create_proc0 = mac_partition_create_proc0,
279 .mpo_create_proc1 = mac_partition_create_proc1,
280 .mpo_relabel_cred = mac_partition_relabel_cred,
281 .mpo_check_cred_relabel = mac_partition_check_cred_relabel,
282 .mpo_check_cred_visible = mac_partition_check_cred_visible,
283 .mpo_check_proc_debug = mac_partition_check_proc_debug,
284 .mpo_check_proc_sched = mac_partition_check_proc_sched,
285 .mpo_check_proc_signal = mac_partition_check_proc_signal,
286 .mpo_check_socket_visible = mac_partition_check_socket_visible,
287 .mpo_check_vnode_exec = mac_partition_check_vnode_exec,
288 };
289
290 MAC_POLICY_SET(&mac_partition_ops, mac_partition, "TrustedBSD MAC/Partition",
291 MPC_LOADTIME_FLAG_UNLOADOK, &partition_slot);
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