1 /*
2 * SELinux services exported to the rest of the kernel.
3 *
4 * Author: James Morris <jmorris@redhat.com>
5 *
6 * Copyright (C) 2005 Red Hat, Inc., James Morris <jmorris@redhat.com>
7 * Copyright (C) 2006 Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
8 * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <tinytim@us.ibm.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2,
12 * as published by the Free Software Foundation.
13 */
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/selinux.h>
18 #include <linux/fs.h>
19 #include <linux/ipc.h>
20 #include <asm/atomic.h>
21
22 #include "security.h"
23 #include "objsec.h"
24
25 /* SECMARK reference count */
26 extern atomic_t selinux_secmark_refcount;
27
28 int selinux_sid_to_string(u32 sid, char **ctx, u32 *ctxlen)
29 {
30 if (selinux_enabled)
31 return security_sid_to_context(sid, ctx, ctxlen);
32 else {
33 *ctx = NULL;
34 *ctxlen = 0;
35 }
36
37 return 0;
38 }
39
40 void selinux_get_inode_sid(const struct inode *inode, u32 *sid)
41 {
42 if (selinux_enabled) {
43 struct inode_security_struct *isec = inode->i_security;
44 *sid = isec->sid;
45 return;
46 }
47 *sid = 0;
48 }
49
50 void selinux_get_ipc_sid(const struct kern_ipc_perm *ipcp, u32 *sid)
51 {
52 if (selinux_enabled) {
53 struct ipc_security_struct *isec = ipcp->security;
54 *sid = isec->sid;
55 return;
56 }
57 *sid = 0;
58 }
59
60 void selinux_get_task_sid(struct task_struct *tsk, u32 *sid)
61 {
62 if (selinux_enabled) {
63 struct task_security_struct *tsec = tsk->security;
64 *sid = tsec->sid;
65 return;
66 }
67 *sid = 0;
68 }
69
70 int selinux_string_to_sid(char *str, u32 *sid)
71 {
72 if (selinux_enabled)
73 return security_context_to_sid(str, strlen(str), sid);
74 else {
75 *sid = 0;
76 return 0;
77 }
78 }
79 EXPORT_SYMBOL_GPL(selinux_string_to_sid);
80
81 int selinux_secmark_relabel_packet_permission(u32 sid)
82 {
83 if (selinux_enabled) {
84 struct task_security_struct *tsec = current->security;
85
86 return avc_has_perm(tsec->sid, sid, SECCLASS_PACKET,
87 PACKET__RELABELTO, NULL);
88 }
89 return 0;
90 }
91 EXPORT_SYMBOL_GPL(selinux_secmark_relabel_packet_permission);
92
93 void selinux_secmark_refcount_inc(void)
94 {
95 atomic_inc(&selinux_secmark_refcount);
96 }
97 EXPORT_SYMBOL_GPL(selinux_secmark_refcount_inc);
98
99 void selinux_secmark_refcount_dec(void)
100 {
101 atomic_dec(&selinux_secmark_refcount);
102 }
103 EXPORT_SYMBOL_GPL(selinux_secmark_refcount_dec);
104
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