objsec.h

  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 <linux/bpf.h>
 30#include "flask.h"
 31#include "avc.h"
 32
 33struct avdc_entry {
 34	u32 isid; /* inode SID */
 35	u32 allowed; /* allowed permission bitmask */
 36	u32 audited; /* audited permission bitmask */
 37	bool permissive; /* AVC permissive flag */
 38};
 39
 40struct cred_security_struct {
 41	u32 osid; /* SID prior to last execve */
 42	u32 sid; /* current SID */
 43	u32 exec_sid; /* exec SID */
 44	u32 create_sid; /* fscreate SID */
 45	u32 keycreate_sid; /* keycreate SID */
 46	u32 sockcreate_sid; /* fscreate SID */
 47} __randomize_layout;
 48
 49struct task_security_struct {
 50#define TSEC_AVDC_DIR_SIZE (1 << 2)
 51	struct {
 52		u32 sid; /* current SID for cached entries */
 53		u32 seqno; /* AVC sequence number */
 54		unsigned int dir_spot; /* dir cache index to check first */
 55		struct avdc_entry dir[TSEC_AVDC_DIR_SIZE]; /* dir entries */
 56		bool permissive_neveraudit; /* permissive and neveraudit */
 57	} avdcache;
 58} __randomize_layout;
 59
 60static inline bool task_avdcache_permnoaudit(struct task_security_struct *tsec,
 61					     u32 sid)
 62{
 63	return (tsec->avdcache.permissive_neveraudit &&
 64		sid == tsec->avdcache.sid &&
 65		tsec->avdcache.seqno == avc_policy_seqno());
 66}
 67
 68enum label_initialized {
 69	LABEL_INVALID, /* invalid or not initialized */
 70	LABEL_INITIALIZED, /* initialized */
 71	LABEL_PENDING
 72};
 73
 74struct inode_security_struct {
 75	struct inode *inode; /* back pointer to inode object */
 76	struct list_head list; /* list of inode_security_struct */
 77	u32 task_sid; /* SID of creating task */
 78	u32 sid; /* SID of this object */
 79	u16 sclass; /* security class of this object */
 80	unsigned char initialized; /* initialization flag */
 81	spinlock_t lock;
 82};
 83
 84struct file_security_struct {
 85	u32 sid; /* SID of open file description */
 86	u32 fown_sid; /* SID of file owner (for SIGIO) */
 87	u32 isid; /* SID of inode at the time of file open */
 88	u32 pseqno; /* Policy seqno at the time of file open */
 89};
 90
 91struct superblock_security_struct {
 92	u32 sid; /* SID of file system superblock */
 93	u32 def_sid; /* default SID for labeling */
 94	u32 mntpoint_sid; /* SECURITY_FS_USE_MNTPOINT context for files */
 95	unsigned short behavior; /* labeling behavior */
 96	unsigned short flags; /* which mount options were specified */
 97	struct mutex lock;
 98	struct list_head isec_head;
 99	spinlock_t isec_lock;
100};
101
102struct msg_security_struct {
103	u32 sid; /* SID of message */
104};
105
106struct ipc_security_struct {
107	u16 sclass; /* security class of this object */
108	u32 sid; /* SID of IPC resource */
109};
110
111struct netif_security_struct {
112	const struct net *ns; /* network namespace */
113	int ifindex; /* device index */
114	u32 sid; /* SID for this interface */
115};
116
117struct netnode_security_struct {
118	union {
119		__be32 ipv4; /* IPv4 node address */
120		struct in6_addr ipv6; /* IPv6 node address */
121	} addr;
122	u32 sid; /* SID for this node */
123	u16 family; /* address family */
124};
125
126struct netport_security_struct {
127	u32 sid; /* SID for this node */
128	u16 port; /* port number */
129	u8 protocol; /* transport protocol */
130};
131
132struct sk_security_struct {
133#ifdef CONFIG_NETLABEL
134	enum { /* NetLabel state */
135	       NLBL_UNSET = 0,
136	       NLBL_REQUIRE,
137	       NLBL_LABELED,
138	       NLBL_REQSKB,
139	       NLBL_CONNLABELED,
140	} nlbl_state;
141	struct netlbl_lsm_secattr *nlbl_secattr; /* NetLabel sec attributes */
142#endif
143	u32 sid; /* SID of this object */
144	u32 peer_sid; /* SID of peer */
145	u16 sclass; /* sock security class */
146	enum { /* SCTP association state */
147	       SCTP_ASSOC_UNSET = 0,
148	       SCTP_ASSOC_SET,
149	} sctp_assoc_state;
150};
151
152struct tun_security_struct {
153	u32 sid; /* SID for the tun device sockets */
154};
155
156struct key_security_struct {
157	u32 sid; /* SID of key */
158};
159
160struct ib_security_struct {
161	u32 sid; /* SID of the queue pair or MAD agent */
162};
163
164struct pkey_security_struct {
165	u64 subnet_prefix; /* Port subnet prefix */
166	u16 pkey; /* PKey number */
167	u32 sid; /* SID of pkey */
168};
169
170struct bpf_security_struct {
171	u32 sid; /* SID of bpf obj creator */
172};
173
174struct perf_event_security_struct {
175	u32 sid; /* SID of perf_event obj creator */
176};
177
178extern struct lsm_blob_sizes selinux_blob_sizes;
179static inline struct cred_security_struct *selinux_cred(const struct cred *cred)
180{
181	return cred->security + selinux_blob_sizes.lbs_cred;
182}
183
184static inline struct task_security_struct *
185selinux_task(const struct task_struct *task)
186{
187	return task->security + selinux_blob_sizes.lbs_task;
188}
189
190static inline struct file_security_struct *selinux_file(const struct file *file)
191{
192	return file->f_security + selinux_blob_sizes.lbs_file;
193}
194
195static inline struct inode_security_struct *
196selinux_inode(const struct inode *inode)
197{
198	if (unlikely(!inode->i_security))
199		return NULL;
200	return inode->i_security + selinux_blob_sizes.lbs_inode;
201}
202
203static inline struct msg_security_struct *
204selinux_msg_msg(const struct msg_msg *msg_msg)
205{
206	return msg_msg->security + selinux_blob_sizes.lbs_msg_msg;
207}
208
209static inline struct ipc_security_struct *
210selinux_ipc(const struct kern_ipc_perm *ipc)
211{
212	return ipc->security + selinux_blob_sizes.lbs_ipc;
213}
214
215/*
216 * get the subjective security ID of the current task
217 */
218static inline u32 current_sid(void)
219{
220	const struct cred_security_struct *crsec = selinux_cred(current_cred());
221
222	return crsec->sid;
223}
224
225static inline struct superblock_security_struct *
226selinux_superblock(const struct super_block *superblock)
227{
228	return superblock->s_security + selinux_blob_sizes.lbs_superblock;
229}
230
231#ifdef CONFIG_KEYS
232static inline struct key_security_struct *selinux_key(const struct key *key)
233{
234	return key->security + selinux_blob_sizes.lbs_key;
235}
236#endif /* CONFIG_KEYS */
237
238static inline struct sk_security_struct *selinux_sock(const struct sock *sock)
239{
240	return sock->sk_security + selinux_blob_sizes.lbs_sock;
241}
242
243static inline struct tun_security_struct *selinux_tun_dev(void *security)
244{
245	return security + selinux_blob_sizes.lbs_tun_dev;
246}
247
248static inline struct ib_security_struct *selinux_ib(void *ib_sec)
249{
250	return ib_sec + selinux_blob_sizes.lbs_ib;
251}
252
253static inline struct perf_event_security_struct *
254selinux_perf_event(void *perf_event)
255{
256	return perf_event + selinux_blob_sizes.lbs_perf_event;
257}
258
259#ifdef CONFIG_BPF_SYSCALL
260static inline struct bpf_security_struct *
261selinux_bpf_map_security(struct bpf_map *map)
262{
263	return map->security + selinux_blob_sizes.lbs_bpf_map;
264}
265
266static inline struct bpf_security_struct *
267selinux_bpf_prog_security(struct bpf_prog *prog)
268{
269	return prog->aux->security + selinux_blob_sizes.lbs_bpf_prog;
270}
271
272static inline struct bpf_security_struct *
273selinux_bpf_token_security(struct bpf_token *token)
274{
275	return token->security + selinux_blob_sizes.lbs_bpf_token;
276}
277#endif /* CONFIG_BPF_SYSCALL */
278#endif /* _SELINUX_OBJSEC_H_ */