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