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 33 struct 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 40 struct 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 57 static 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 64 enum label_initialized { 65 LABEL_INVALID, /* invalid or not initialized */ 66 LABEL_INITIALIZED, /* initialized */ 67 LABEL_PENDING 68 }; 69 70 struct 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 80 struct 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 87 struct 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 98 struct msg_security_struct { 99 u32 sid; /* SID of message */ 100 }; 101 102 struct ipc_security_struct { 103 u16 sclass; /* security class of this object */ 104 u32 sid; /* SID of IPC resource */ 105 }; 106 107 struct netif_security_struct { 108 const struct net *ns; /* network namespace */ 109 int ifindex; /* device index */ 110 u32 sid; /* SID for this interface */ 111 }; 112 113 struct 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 }; 121 122 struct netport_security_struct { 123 u32 sid; /* SID for this node */ 124 u16 port; /* port number */ 125 u8 protocol; /* transport protocol */ 126 }; 127 128 struct 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 }; 147 148 struct tun_security_struct { 149 u32 sid; /* SID for the tun device sockets */ 150 }; 151 152 struct key_security_struct { 153 u32 sid; /* SID of key */ 154 }; 155 156 struct ib_security_struct { 157 u32 sid; /* SID of the queue pair or MAD agent */ 158 }; 159 160 struct pkey_security_struct { 161 u64 subnet_prefix; /* Port subnet prefix */ 162 u16 pkey; /* PKey number */ 163 u32 sid; /* SID of pkey */ 164 }; 165 166 struct bpf_security_struct { 167 u32 sid; /* SID of bpf obj creator */ 168 }; 169 170 struct perf_event_security_struct { 171 u32 sid; /* SID of perf_event obj creator */ 172 }; 173 174 extern struct lsm_blob_sizes selinux_blob_sizes; 175 static inline struct task_security_struct *selinux_cred(const struct cred *cred) 176 { 177 return cred->security + selinux_blob_sizes.lbs_cred; 178 } 179 180 static inline struct file_security_struct *selinux_file(const struct file *file) 181 { 182 return file->f_security + selinux_blob_sizes.lbs_file; 183 } 184 185 static inline struct inode_security_struct * 186 selinux_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 } 192 193 static inline struct msg_security_struct * 194 selinux_msg_msg(const struct msg_msg *msg_msg) 195 { 196 return msg_msg->security + selinux_blob_sizes.lbs_msg_msg; 197 } 198 199 static inline struct ipc_security_struct * 200 selinux_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 */ 208 static inline u32 current_sid(void) 209 { 210 const struct task_security_struct *tsec = selinux_cred(current_cred()); 211 212 return tsec->sid; 213 } 214 215 static inline struct superblock_security_struct * 216 selinux_superblock(const struct super_block *superblock) 217 { 218 return superblock->s_security + selinux_blob_sizes.lbs_superblock; 219 } 220 221 #ifdef CONFIG_KEYS 222 static 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 */ 227 228 static inline struct sk_security_struct *selinux_sock(const struct sock *sock) 229 { 230 return sock->sk_security + selinux_blob_sizes.lbs_sock; 231 } 232 233 static inline struct tun_security_struct *selinux_tun_dev(void *security) 234 { 235 return security + selinux_blob_sizes.lbs_tun_dev; 236 } 237 238 static inline struct ib_security_struct *selinux_ib(void *ib_sec) 239 { 240 return ib_sec + selinux_blob_sizes.lbs_ib; 241 } 242 243 static inline struct perf_event_security_struct * 244 selinux_perf_event(void *perf_event) 245 { 246 return perf_event + selinux_blob_sizes.lbs_perf_event; 247 } 248 249 #ifdef CONFIG_BPF_SYSCALL 250 static inline struct bpf_security_struct * 251 selinux_bpf_map_security(struct bpf_map *map) 252 { 253 return map->security + selinux_blob_sizes.lbs_bpf_map; 254 } 255 256 static inline struct bpf_security_struct * 257 selinux_bpf_prog_security(struct bpf_prog *prog) 258 { 259 return prog->aux->security + selinux_blob_sizes.lbs_bpf_prog; 260 } 261 262 static inline struct bpf_security_struct * 263 selinux_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