1 /*-
2 * Copyright (c) 2006 nCircle Network Security, Inc.
3 * All rights reserved.
4 *
5 * This software was developed by Robert N. M. Watson for the TrustedBSD
6 * Project under contract to nCircle Network Security, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
21 * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
23 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
24 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
25 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
26 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /*
31 * MAC checks for system privileges.
32 */
33
34 #include "sys/cdefs.h"
35 __FBSDID("$FreeBSD$");
36
37 #include "opt_mac.h"
38
39 #include <sys/param.h>
40 #include <sys/priv.h>
41 #include <sys/module.h>
42
43 #include <security/mac/mac_framework.h>
44 #include <security/mac/mac_internal.h>
45 #include <security/mac/mac_policy.h>
46
47 /*
48 * The MAC Framework interacts with kernel privilege checks in two ways: it
49 * may restrict the granting of privilege to a subject, and it may grant
50 * additional privileges to the subject. Policies may implement none, one,
51 * or both of these entry points. Restriction of privilege by any policy
52 * always overrides granting of privilege by any policy or other privilege
53 * mechanism. See kern_priv.c:priv_check_cred() for details of the
54 * composition.
55 */
56
57 /*
58 * Restrict access to a privilege for a credential. Return failure if any
59 * policy denies access.
60 */
61 int
62 mac_priv_check(struct ucred *cred, int priv)
63 {
64 int error;
65
66 MAC_CHECK(priv_check, cred, priv);
67
68 return (error);
69 }
70
71 /*
72 * Grant access to a privilege for a credential. Return success if any
73 * policy grants access.
74 */
75 int
76 mac_priv_grant(struct ucred *cred, int priv)
77 {
78 int error;
79
80 MAC_GRANT(priv_grant, cred, priv);
81
82 return (error);
83 }
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