1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *  Security-Enhanced Linux (SELinux) security module
4 *
5 *  This file contains the SELinux security data structures for kernel objects.
6 *
7 *  Author(s):  Stephen Smalley, <stephen.smalley.work@gmail.com>
8 *		Chris Vance, <cvance@nai.com>
9 *		Wayne Salamon, <wsalamon@nai.com>
10 *		James Morris <jmorris@redhat.com>
11 *
12 *  Copyright (C) 2001,2002 Networks Associates Technology, Inc.
13 *  Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
14 *  Copyright (C) 2016 Mellanox Technologies
15 */
16#ifndef _SELINUX_OBJSEC_H_
17#define _SELINUX_OBJSEC_H_
18
19#include <linux/list.h>
20#include <linux/sched.h>
21#include <linux/fs.h>
22#include <linux/binfmts.h>
23#include <linux/in.h>
24#include <linux/spinlock.h>
25#include <linux/lsm_hooks.h>
26#include <linux/msg.h>
27#include <net/net_namespace.h>
28#include "flask.h"
29#include "avc.h"
30
31struct task_security_struct {
32	u32 osid;		/* SID prior to last execve */
33	u32 sid;		/* current SID */
34	u32 exec_sid;		/* exec SID */
35	u32 create_sid;		/* fscreate SID */
36	u32 keycreate_sid;	/* keycreate SID */
37	u32 sockcreate_sid;	/* fscreate SID */
38} __randomize_layout;
39
40enum label_initialized {
41	LABEL_INVALID,		/* invalid or not initialized */
42	LABEL_INITIALIZED,	/* initialized */
43	LABEL_PENDING
44};
45
46struct inode_security_struct {
47	struct inode *inode;	/* back pointer to inode object */
48	struct list_head list;	/* list of inode_security_struct */
49	u32 task_sid;		/* SID of creating task */
50	u32 sid;		/* SID of this object */
51	u16 sclass;		/* security class of this object */
52	unsigned char initialized;	/* initialization flag */
53	spinlock_t lock;
54};
55
56struct file_security_struct {
57	u32 sid;		/* SID of open file description */
58	u32 fown_sid;		/* SID of file owner (for SIGIO) */
59	u32 isid;		/* SID of inode at the time of file open */
60	u32 pseqno;		/* Policy seqno at the time of file open */
61};
62
63struct superblock_security_struct {
64	u32 sid;			/* SID of file system superblock */
65	u32 def_sid;			/* default SID for labeling */
66	u32 mntpoint_sid;		/* SECURITY_FS_USE_MNTPOINT context for files */
67	unsigned short behavior;	/* labeling behavior */
68	unsigned short flags;		/* which mount options were specified */
69	struct mutex lock;
70	struct list_head isec_head;
71	spinlock_t isec_lock;
72};
73
74struct msg_security_struct {
75	u32 sid;	/* SID of message */
76};
77
78struct ipc_security_struct {
79	u16 sclass;	/* security class of this object */
80	u32 sid;	/* SID of IPC resource */
81};
82
83struct netif_security_struct {
84	struct net *ns;			/* network namespace */
85	int ifindex;			/* device index */
86	u32 sid;			/* SID for this interface */
87};
88
89struct netnode_security_struct {
90	union {
91		__be32 ipv4;		/* IPv4 node address */
92		struct in6_addr ipv6;	/* IPv6 node address */
93	} addr;
94	u32 sid;			/* SID for this node */
95	u16 family;			/* address family */
96};
97
98struct netport_security_struct {
99	u32 sid;			/* SID for this node */
100	u16 port;			/* port number */
101	u8 protocol;			/* transport protocol */
102};
103
104struct sk_security_struct {
105#ifdef CONFIG_NETLABEL
106	enum {				/* NetLabel state */
107		NLBL_UNSET = 0,
108		NLBL_REQUIRE,
109		NLBL_LABELED,
110		NLBL_REQSKB,
111		NLBL_CONNLABELED,
112	} nlbl_state;
113	struct netlbl_lsm_secattr *nlbl_secattr; /* NetLabel sec attributes */
114#endif
115	u32 sid;			/* SID of this object */
116	u32 peer_sid;			/* SID of peer */
117	u16 sclass;			/* sock security class */
118	enum {				/* SCTP association state */
119		SCTP_ASSOC_UNSET = 0,
120		SCTP_ASSOC_SET,
121	} sctp_assoc_state;
122};
123
124struct tun_security_struct {
125	u32 sid;			/* SID for the tun device sockets */
126};
127
128struct key_security_struct {
129	u32 sid;	/* SID of key */
130};
131
132struct ib_security_struct {
133	u32 sid;        /* SID of the queue pair or MAD agent */
134};
135
136struct pkey_security_struct {
137	u64	subnet_prefix; /* Port subnet prefix */
138	u16	pkey;	/* PKey number */
139	u32	sid;	/* SID of pkey */
140};
141
142struct bpf_security_struct {
143	u32 sid;  /* SID of bpf obj creator */
144};
145
146struct perf_event_security_struct {
147	u32 sid;  /* SID of perf_event obj creator */
148};
149
150extern struct lsm_blob_sizes selinux_blob_sizes;
151static inline struct task_security_struct *selinux_cred(const struct cred *cred)
152{
153	return cred->security + selinux_blob_sizes.lbs_cred;
154}
155
156static inline struct file_security_struct *selinux_file(const struct file *file)
157{
158	return file->f_security + selinux_blob_sizes.lbs_file;
159}
160
161static inline struct inode_security_struct *selinux_inode(
162						const struct inode *inode)
163{
164	if (unlikely(!inode->i_security))
165		return NULL;
166	return inode->i_security + selinux_blob_sizes.lbs_inode;
167}
168
169static inline struct msg_security_struct *selinux_msg_msg(
170						const struct msg_msg *msg_msg)
171{
172	return msg_msg->security + selinux_blob_sizes.lbs_msg_msg;
173}
174
175static inline struct ipc_security_struct *selinux_ipc(
176						const struct kern_ipc_perm *ipc)
177{
178	return ipc->security + selinux_blob_sizes.lbs_ipc;
179}
180
181/*
182 * get the subjective security ID of the current task
183 */
184static inline u32 current_sid(void)
185{
186	const struct task_security_struct *tsec = selinux_cred(current_cred());
187
188	return tsec->sid;
189}
190
191static inline struct superblock_security_struct *selinux_superblock(
192					const struct super_block *superblock)
193{
194	return superblock->s_security + selinux_blob_sizes.lbs_superblock;
195}
196
197#endif /* _SELINUX_OBJSEC_H_ */
198