2 * Copyright (c) 1999-2002, 2007-2008 Robert N. M. Watson
3 * Copyright (c) 2001-2002 Networks Associates Technology, Inc.
4 * Copyright (c) 2006 SPARTA, Inc.
5 * Copyright (c) 2008 Apple Inc.
8 * This software was developed by Robert Watson for the TrustedBSD Project.
10 * This software was developed for the FreeBSD Project in part by Network
11 * Associates Laboratories, the Security Research Division of Network
12 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
13 * as part of the DARPA CHATS research program.
15 * This software was enhanced by SPARTA ISSO under SPAWAR contract
16 * N66001-04-C-6019 ("SEFOS").
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 * Developed by the TrustedBSD Project.
45 * Experiment with a partition-like model.
48 #include <sys/param.h>
49 #include <sys/kernel.h>
50 #include <sys/module.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/systm.h>
57 #include <sys/sysctl.h>
59 #include <net/route.h>
60 #include <netinet/in.h>
61 #include <netinet/in_pcb.h>
63 #include <security/mac/mac_policy.h>
64 #include <security/mac_partition/mac_partition.h>
66 SYSCTL_DECL(_security_mac);
68 static SYSCTL_NODE(_security_mac, OID_AUTO, partition, CTLFLAG_RW, 0,
69 "TrustedBSD mac_partition policy controls");
71 static int partition_enabled = 1;
72 SYSCTL_INT(_security_mac_partition, OID_AUTO, enabled, CTLFLAG_RW,
73 &partition_enabled, 0, "Enforce partition policy");
75 static int partition_slot;
76 #define SLOT(l) mac_label_get((l), partition_slot)
77 #define SLOT_SET(l, v) mac_label_set((l), partition_slot, (v))
80 partition_check(struct label *subject, struct label *object)
83 if (partition_enabled == 0)
89 if (SLOT(subject) == 0)
93 * If the object label hasn't been allocated, then it's effectively
94 * not in a partition, and we know the subject is as it has a label
95 * and it's not 0, so reject.
100 if (SLOT(subject) == SLOT(object))
107 * Object-specific entry points are sorted alphabetically by object type name
108 * and then by operation.
111 partition_cred_check_relabel(struct ucred *cred, struct label *newlabel)
118 * Treat "0" as a no-op request because it reflects an unset
119 * partition label. If we ever want to support switching back to an
120 * unpartitioned state for a process, we'll need to differentiate the
121 * "not in a partition" and "no partition defined during internalize"
124 if (SLOT(newlabel) != 0) {
126 * Require BSD privilege in order to change the partition.
127 * Originally we also required that the process not be in a
128 * partition in the first place, but this didn't interact
129 * well with sendmail.
131 error = priv_check_cred(cred, PRIV_MAC_PARTITION, 0);
138 partition_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
142 error = partition_check(cr1->cr_label, cr2->cr_label);
144 return (error == 0 ? 0 : ESRCH);
148 partition_cred_copy_label(struct label *src, struct label *dest)
151 if (src != NULL && dest != NULL)
152 SLOT_SET(dest, SLOT(src));
153 else if (dest != NULL)
158 partition_cred_create_init(struct ucred *cred)
161 SLOT_SET(cred->cr_label, 0);
165 partition_cred_create_swapper(struct ucred *cred)
168 SLOT_SET(cred->cr_label, 0);
172 partition_cred_destroy_label(struct label *label)
179 partition_cred_externalize_label(struct label *label, char *element_name,
180 struct sbuf *sb, int *claimed)
183 if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0)
189 if (sbuf_printf(sb, "%jd", (intmax_t)SLOT(label)) == -1)
192 if (sbuf_printf(sb, "0") == -1)
199 partition_cred_init_label(struct label *label)
206 partition_cred_internalize_label(struct label *label, char *element_name,
207 char *element_data, int *claimed)
210 if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0)
214 SLOT_SET(label, strtol(element_data, NULL, 10));
219 partition_cred_relabel(struct ucred *cred, struct label *newlabel)
222 if (newlabel != NULL && SLOT(newlabel) != 0)
223 SLOT_SET(cred->cr_label, SLOT(newlabel));
227 partition_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
228 struct label *inplabel)
232 error = partition_check(cred->cr_label, inp->inp_cred->cr_label);
234 return (error ? ENOENT : 0);
238 partition_proc_check_debug(struct ucred *cred, struct proc *p)
242 error = partition_check(cred->cr_label, p->p_ucred->cr_label);
244 return (error ? ESRCH : 0);
248 partition_proc_check_sched(struct ucred *cred, struct proc *p)
252 error = partition_check(cred->cr_label, p->p_ucred->cr_label);
254 return (error ? ESRCH : 0);
258 partition_proc_check_signal(struct ucred *cred, struct proc *p,
263 error = partition_check(cred->cr_label, p->p_ucred->cr_label);
265 return (error ? ESRCH : 0);
269 partition_socket_check_visible(struct ucred *cred, struct socket *so,
270 struct label *solabel)
274 error = partition_check(cred->cr_label, so->so_cred->cr_label);
276 return (error ? ENOENT : 0);
280 partition_vnode_check_exec(struct ucred *cred, struct vnode *vp,
281 struct label *vplabel, struct image_params *imgp,
282 struct label *execlabel)
285 if (execlabel != NULL) {
287 * We currently don't permit labels to be changed at
288 * exec-time as part of the partition model, so disallow
289 * non-NULL partition label changes in execlabel.
291 if (SLOT(execlabel) != 0)
298 static struct mac_policy_ops partition_ops =
300 .mpo_cred_check_relabel = partition_cred_check_relabel,
301 .mpo_cred_check_visible = partition_cred_check_visible,
302 .mpo_cred_copy_label = partition_cred_copy_label,
303 .mpo_cred_create_init = partition_cred_create_init,
304 .mpo_cred_create_swapper = partition_cred_create_swapper,
305 .mpo_cred_destroy_label = partition_cred_destroy_label,
306 .mpo_cred_externalize_label = partition_cred_externalize_label,
307 .mpo_cred_init_label = partition_cred_init_label,
308 .mpo_cred_internalize_label = partition_cred_internalize_label,
309 .mpo_cred_relabel = partition_cred_relabel,
310 .mpo_inpcb_check_visible = partition_inpcb_check_visible,
311 .mpo_proc_check_debug = partition_proc_check_debug,
312 .mpo_proc_check_sched = partition_proc_check_sched,
313 .mpo_proc_check_signal = partition_proc_check_signal,
314 .mpo_socket_check_visible = partition_socket_check_visible,
315 .mpo_vnode_check_exec = partition_vnode_check_exec,
318 MAC_POLICY_SET(&partition_ops, mac_partition, "TrustedBSD MAC/Partition",
319 MPC_LOADTIME_FLAG_UNLOADOK, &partition_slot);