mac_cred.c revision 185539 
1/*-
2 * Copyright (c) 1999-2002, 2008 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 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 *    notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 *    notice, this list of conditions and the following disclaimer in the
28 *    documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 */
42
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD: head/sys/security/mac/mac_cred.c 185539 2008-12-02 02:26:15Z peter $");
45
46#include "opt_mac.h"
47
48#include <sys/param.h>
49#include <sys/condvar.h>
50#include <sys/imgact.h>
51#include <sys/kernel.h>
52#include <sys/lock.h>
53#include <sys/malloc.h>
54#include <sys/mutex.h>
55#include <sys/mac.h>
56#include <sys/proc.h>
57#include <sys/sbuf.h>
58#include <sys/systm.h>
59#include <sys/vnode.h>
60#include <sys/mount.h>
61#include <sys/file.h>
62#include <sys/namei.h>
63#include <sys/sysctl.h>
64
65#include <vm/vm.h>
66#include <vm/pmap.h>
67#include <vm/vm_map.h>
68#include <vm/vm_object.h>
69
70#include <security/mac/mac_framework.h>
71#include <security/mac/mac_internal.h>
72#include <security/mac/mac_policy.h>
73
74struct label *
75mac_cred_label_alloc(void)
76{
77	struct label *label;
78
79	label = mac_labelzone_alloc(M_WAITOK);
80	MAC_PERFORM(cred_init_label, label);
81	return (label);
82}
83
84void
85mac_cred_init(struct ucred *cred)
86{
87
88	if (mac_labeled & MPC_OBJECT_CRED)
89		cred->cr_label = mac_cred_label_alloc();
90	else
91		cred->cr_label = NULL;
92}
93
94void
95mac_cred_label_free(struct label *label)
96{
97
98	MAC_PERFORM(cred_destroy_label, label);
99	mac_labelzone_free(label);
100}
101
102void
103mac_cred_destroy(struct ucred *cred)
104{
105
106	if (cred->cr_label != NULL) {
107		mac_cred_label_free(cred->cr_label);
108		cred->cr_label = NULL;
109	}
110}
111
112/*
113 * When a thread becomes an NFS server daemon, its credential may need to be
114 * updated to reflect this so that policies can recognize when file system
115 * operations originate from the network.
116 *
117 * At some point, it would be desirable if the credential used for each NFS
118 * RPC could be set based on the RPC context (i.e., source system, etc) to
119 * provide more fine-grained access control.
120 */
121void
122mac_cred_associate_nfsd(struct ucred *cred)
123{
124
125	MAC_PERFORM(cred_associate_nfsd, cred);
126}
127
128/*
129 * Initialize MAC label for the first kernel process, from which other kernel
130 * processes and threads are spawned.
131 */
132void
133mac_cred_create_swapper(struct ucred *cred)
134{
135
136	MAC_PERFORM(cred_create_swapper, cred);
137}
138
139/*
140 * Initialize MAC label for the first userland process, from which other
141 * userland processes and threads are spawned.
142 */
143void
144mac_cred_create_init(struct ucred *cred)
145{
146
147	MAC_PERFORM(cred_create_init, cred);
148}
149
150int
151mac_cred_externalize_label(struct label *label, char *elements,
152    char *outbuf, size_t outbuflen)
153{
154	int error;
155
156	MAC_EXTERNALIZE(cred, label, elements, outbuf, outbuflen);
157
158	return (error);
159}
160
161int
162mac_cred_internalize_label(struct label *label, char *string)
163{
164	int error;
165
166	MAC_INTERNALIZE(cred, label, string);
167
168	return (error);
169}
170
171/*
172 * When a new process is created, its label must be initialized.  Generally,
173 * this involves inheritence from the parent process, modulo possible deltas.
174 * This function allows that processing to take place.
175 */
176void
177mac_cred_copy(struct ucred *src, struct ucred *dest)
178{
179
180	MAC_PERFORM(cred_copy_label, src->cr_label, dest->cr_label);
181}
182
183/*
184 * When the subject's label changes, it may require revocation of privilege
185 * to mapped objects.  This can't be done on-the-fly later with a unified
186 * buffer cache.
187 */
188void
189mac_cred_relabel(struct ucred *cred, struct label *newlabel)
190{
191
192	MAC_PERFORM(cred_relabel, cred, newlabel);
193}
194
195int
196mac_cred_check_relabel(struct ucred *cred, struct label *newlabel)
197{
198	int error;
199
200	MAC_CHECK(cred_check_relabel, cred, newlabel);
201
202	return (error);
203}
204
205int
206mac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
207{
208	int error;
209
210	MAC_CHECK(cred_check_visible, cr1, cr2);
211
212	return (error);
213}
214