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 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; 174 static inline struct task_security_struct *selinux_cred(const struct cred *cred) 175 { 176 return cred->security + selinux_blob_sizes.lbs_cred; 177 } 178 179 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 * 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 * 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 * 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 */ 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 * 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 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 */ 226 227 static inline struct sk_security_struct *selinux_sock(const struct sock *sock) 228 { 229 return sock->sk_security + selinux_blob_sizes.lbs_sock; 230 } 231 232 static inline struct tun_security_struct *selinux_tun_dev(void *security) 233 { 234 return security + selinux_blob_sizes.lbs_tun_dev; 235 } 236 237 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 * 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