security/selinux/include/objsec.h

   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         struct super_block *sb;         /* back pointer to sb object */
  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 *selinux_inode(
 163                                                 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(
 171                                                 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(
 177                                                 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 #endif /* _SELINUX_OBJSEC_H_ */