1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * NSA 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, <sds@tycho.nsa.gov>
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 #ifndef _SELINUX_OBJSEC_H_
17 #define _SELINUX_OBJSEC_H_
18
19 #include <linux/list.h>
20 #include <linux/sched.h>
21 #include <linux/fs.h>
22 #include <linux/binfmts.h>
23 #include <linux/in.h>
24 #include <linux/spinlock.h>
25 #include <linux/lsm_hooks.h>
26 #include <linux/msg.h>
27 #include <net/net_namespace.h>
28 #include "flask.h"
29 #include "avc.h"
30
31 struct task_security_struct {
32 u32 osid; /* SID prior to last execve */
33 u32 sid; /* current SID */
34 u32 exec_sid; /* exec SID */
35 u32 create_sid; /* fscreate SID */
36 u32 keycreate_sid; /* keycreate SID */
37 u32 sockcreate_sid; /* fscreate SID */
38 } __randomize_layout;
39
40 enum label_initialized {
41 LABEL_INVALID, /* invalid or not initialized */
42 LABEL_INITIALIZED, /* initialized */
43 LABEL_PENDING
44 };
45
46 struct inode_security_struct {
47 struct inode *inode; /* back pointer to inode object */
48 struct list_head list; /* list of inode_security_struct */
49 u32 task_sid; /* SID of creating task */
50 u32 sid; /* SID of this object */
51 u16 sclass; /* security class of this object */
52 unsigned char initialized; /* initialization flag */
53 spinlock_t lock;
54 };
55
56 struct file_security_struct {
57 u32 sid; /* SID of open file description */
58 u32 fown_sid; /* SID of file owner (for SIGIO) */
59 u32 isid; /* SID of inode at the time of file open */
60 u32 pseqno; /* Policy seqno at the time of file open */
61 };
62
63 struct superblock_security_struct {
64 u32 sid; /* SID of file system superblock */
65 u32 def_sid; /* default SID for labeling */
66 u32 mntpoint_sid; /* SECURITY_FS_USE_MNTPOINT context for files */
67 unsigned short behavior; /* labeling behavior */
68 unsigned short flags; /* which mount options were specified */
69 struct mutex lock;
70 struct list_head isec_head;
71 spinlock_t isec_lock;
72 };
73
74 struct msg_security_struct {
75 u32 sid; /* SID of message */
76 };
77
78 struct ipc_security_struct {
79 u16 sclass; /* security class of this object */
80 u32 sid; /* SID of IPC resource */
81 };
82
83 struct netif_security_struct {
84 struct net *ns; /* network namespace */
85 int ifindex; /* device index */
86 u32 sid; /* SID for this interface */
87 };
88
89 struct netnode_security_struct {
90 union {
91 __be32 ipv4; /* IPv4 node address */
92 struct in6_addr ipv6; /* IPv6 node address */
93 } addr;
94 u32 sid; /* SID for this node */
95 u16 family; /* address family */
96 };
97
98 struct netport_security_struct {
99 u32 sid; /* SID for this node */
100 u16 port; /* port number */
101 u8 protocol; /* transport protocol */
102 };
103
104 struct sk_security_struct {
105 #ifdef CONFIG_NETLABEL
106 enum { /* NetLabel state */
107 NLBL_UNSET = 0,
108 NLBL_REQUIRE,
109 NLBL_LABELED,
110 NLBL_REQSKB,
111 NLBL_CONNLABELED,
112 } nlbl_state;
113 struct netlbl_lsm_secattr *nlbl_secattr; /* NetLabel sec attributes */
114 #endif
115 u32 sid; /* SID of this object */
116 u32 peer_sid; /* SID of peer */
117 u16 sclass; /* sock security class */
118 enum { /* SCTP association state */
119 SCTP_ASSOC_UNSET = 0,
120 SCTP_ASSOC_SET,
121 } sctp_assoc_state;
122 };
123
124 struct tun_security_struct {
125 u32 sid; /* SID for the tun device sockets */
126 };
127
128 struct key_security_struct {
129 u32 sid; /* SID of key */
130 };
131
132 struct ib_security_struct {
133 u32 sid; /* SID of the queue pair or MAD agent */
134 };
135
136 struct pkey_security_struct {
137 u64 subnet_prefix; /* Port subnet prefix */
138 u16 pkey; /* PKey number */
139 u32 sid; /* SID of pkey */
140 };
141
142 struct bpf_security_struct {
143 u32 sid; /* SID of bpf obj creator */
144 };
145
146 struct perf_event_security_struct {
147 u32 sid; /* SID of perf_event obj creator */
148 };
149
150 extern struct lsm_blob_sizes selinux_blob_sizes;
selinux_cred(const struct cred * cred)151 static inline struct task_security_struct *selinux_cred(const struct cred *cred)
152 {
153 return cred->security + selinux_blob_sizes.lbs_cred;
154 }
155
selinux_file(const struct file * file)156 static inline struct file_security_struct *selinux_file(const struct file *file)
157 {
158 return file->f_security + selinux_blob_sizes.lbs_file;
159 }
160
selinux_inode(const struct inode * inode)161 static inline struct inode_security_struct *selinux_inode(
162 const struct inode *inode)
163 {
164 if (unlikely(!inode->i_security))
165 return NULL;
166 return inode->i_security + selinux_blob_sizes.lbs_inode;
167 }
168
selinux_msg_msg(const struct msg_msg * msg_msg)169 static inline struct msg_security_struct *selinux_msg_msg(
170 const struct msg_msg *msg_msg)
171 {
172 return msg_msg->security + selinux_blob_sizes.lbs_msg_msg;
173 }
174
selinux_ipc(const struct kern_ipc_perm * ipc)175 static inline struct ipc_security_struct *selinux_ipc(
176 const struct kern_ipc_perm *ipc)
177 {
178 return ipc->security + selinux_blob_sizes.lbs_ipc;
179 }
180
181 /*
182 * get the subjective security ID of the current task
183 */
current_sid(void)184 static inline u32 current_sid(void)
185 {
186 const struct task_security_struct *tsec = selinux_cred(current_cred());
187
188 return tsec->sid;
189 }
190
selinux_superblock(const struct super_block * superblock)191 static inline struct superblock_security_struct *selinux_superblock(
192 const struct super_block *superblock)
193 {
194 return superblock->s_security + selinux_blob_sizes.lbs_superblock;
195 }
196
197 #endif /* _SELINUX_OBJSEC_H_ */
198
