xref: /linux/security/selinux/include/objsec.h (revision a6021aa24f6417416d93318bbfa022ab229c33c8)
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;
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 
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 *
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 *
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 *
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  */
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 *
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
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 
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 
210 static inline struct tun_security_struct *selinux_tun_dev(void *security)
211 {
212 	return security + selinux_blob_sizes.lbs_tun_dev;
213 }
214 
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 *
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