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