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