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 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
41 enum label_initialized {
42 LABEL_INVALID, /* invalid or not initialized */
43 LABEL_INITIALIZED, /* initialized */
44 LABEL_PENDING
45 };
46
47 struct 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
57 struct 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
64 struct 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
75 struct msg_security_struct {
76 u32 sid; /* SID of message */
77 };
78
79 struct ipc_security_struct {
80 u16 sclass; /* security class of this object */
81 u32 sid; /* SID of IPC resource */
82 };
83
84 struct netif_security_struct {
85 struct net *ns; /* network namespace */
86 int ifindex; /* device index */
87 u32 sid; /* SID for this interface */
88 };
89
90 struct 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
99 struct netport_security_struct {
100 u32 sid; /* SID for this node */
101 u16 port; /* port number */
102 u8 protocol; /* transport protocol */
103 };
104
105 struct 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
125 struct tun_security_struct {
126 u32 sid; /* SID for the tun device sockets */
127 };
128
129 struct key_security_struct {
130 u32 sid; /* SID of key */
131 };
132
133 struct ib_security_struct {
134 u32 sid; /* SID of the queue pair or MAD agent */
135 };
136
137 struct pkey_security_struct {
138 u64 subnet_prefix; /* Port subnet prefix */
139 u16 pkey; /* PKey number */
140 u32 sid; /* SID of pkey */
141 };
142
143 struct bpf_security_struct {
144 u32 sid; /* SID of bpf obj creator */
145 };
146
147 struct perf_event_security_struct {
148 u32 sid; /* SID of perf_event obj creator */
149 };
150
151 extern struct lsm_blob_sizes selinux_blob_sizes;
selinux_cred(const struct cred * cred)152 static inline struct task_security_struct *selinux_cred(const struct cred *cred)
153 {
154 return cred->security + selinux_blob_sizes.lbs_cred;
155 }
156
selinux_file(const struct file * file)157 static inline struct file_security_struct *selinux_file(const struct file *file)
158 {
159 return file->f_security + selinux_blob_sizes.lbs_file;
160 }
161
162 static inline struct inode_security_struct *
selinux_inode(const struct inode * inode)163 selinux_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
170 static inline struct msg_security_struct *
selinux_msg_msg(const struct msg_msg * msg_msg)171 selinux_msg_msg(const struct msg_msg *msg_msg)
172 {
173 return msg_msg->security + selinux_blob_sizes.lbs_msg_msg;
174 }
175
176 static inline struct ipc_security_struct *
selinux_ipc(const struct kern_ipc_perm * ipc)177 selinux_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 */
current_sid(void)185 static inline u32 current_sid(void)
186 {
187 const struct task_security_struct *tsec = selinux_cred(current_cred());
188
189 return tsec->sid;
190 }
191
192 static inline struct superblock_security_struct *
selinux_superblock(const struct super_block * superblock)193 selinux_superblock(const struct super_block *superblock)
194 {
195 return superblock->s_security + selinux_blob_sizes.lbs_superblock;
196 }
197
198 #ifdef CONFIG_KEYS
selinux_key(const struct key * key)199 static inline struct key_security_struct *selinux_key(const struct key *key)
200 {
201 return key->security + selinux_blob_sizes.lbs_key;
202 }
203 #endif /* CONFIG_KEYS */
204
selinux_sock(const struct sock * sock)205 static inline struct sk_security_struct *selinux_sock(const struct sock *sock)
206 {
207 return sock->sk_security + selinux_blob_sizes.lbs_sock;
208 }
209
selinux_tun_dev(void * security)210 static inline struct tun_security_struct *selinux_tun_dev(void *security)
211 {
212 return security + selinux_blob_sizes.lbs_tun_dev;
213 }
214
selinux_ib(void * ib_sec)215 static inline struct ib_security_struct *selinux_ib(void *ib_sec)
216 {
217 return ib_sec + selinux_blob_sizes.lbs_ib;
218 }
219
220 static inline struct perf_event_security_struct *
selinux_perf_event(void * perf_event)221 selinux_perf_event(void *perf_event)
222 {
223 return perf_event + selinux_blob_sizes.lbs_perf_event;
224 }
225
226 #endif /* _SELINUX_OBJSEC_H_ */
227