1 /* audit -- definition of audit_context structure and supporting types 2 * 3 * Copyright 2003-2004 Red Hat, Inc. 4 * Copyright 2005 Hewlett-Packard Development Company, L.P. 5 * Copyright 2005 IBM Corporation 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 #include <linux/fs.h> 23 #include <linux/audit.h> 24 #include <linux/skbuff.h> 25 26 /* 0 = no checking 27 1 = put_count checking 28 2 = verbose put_count checking 29 */ 30 #define AUDIT_DEBUG 0 31 32 /* At task start time, the audit_state is set in the audit_context using 33 a per-task filter. At syscall entry, the audit_state is augmented by 34 the syscall filter. */ 35 enum audit_state { 36 AUDIT_DISABLED, /* Do not create per-task audit_context. 37 * No syscall-specific audit records can 38 * be generated. */ 39 AUDIT_SETUP_CONTEXT, /* Create the per-task audit_context, 40 * but don't necessarily fill it in at 41 * syscall entry time (i.e., filter 42 * instead). */ 43 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, 44 * and always fill it in at syscall 45 * entry time. This makes a full 46 * syscall record available if some 47 * other part of the kernel decides it 48 * should be recorded. */ 49 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, 50 * always fill it in at syscall entry 51 * time, and always write out the audit 52 * record at syscall exit time. */ 53 }; 54 55 /* Rule lists */ 56 struct audit_parent; 57 58 struct audit_watch { 59 atomic_t count; /* reference count */ 60 char *path; /* insertion path */ 61 dev_t dev; /* associated superblock device */ 62 unsigned long ino; /* associated inode number */ 63 struct audit_parent *parent; /* associated parent */ 64 struct list_head wlist; /* entry in parent->watches list */ 65 struct list_head rules; /* associated rules */ 66 }; 67 68 struct audit_field { 69 u32 type; 70 u32 val; 71 u32 op; 72 char *se_str; 73 struct selinux_audit_rule *se_rule; 74 }; 75 76 struct audit_tree; 77 struct audit_chunk; 78 79 struct audit_krule { 80 int vers_ops; 81 u32 flags; 82 u32 listnr; 83 u32 action; 84 u32 mask[AUDIT_BITMASK_SIZE]; 85 u32 buflen; /* for data alloc on list rules */ 86 u32 field_count; 87 char *filterkey; /* ties events to rules */ 88 struct audit_field *fields; 89 struct audit_field *arch_f; /* quick access to arch field */ 90 struct audit_field *inode_f; /* quick access to an inode field */ 91 struct audit_watch *watch; /* associated watch */ 92 struct audit_tree *tree; /* associated watched tree */ 93 struct list_head rlist; /* entry in audit_{watch,tree}.rules list */ 94 }; 95 96 struct audit_entry { 97 struct list_head list; 98 struct rcu_head rcu; 99 struct audit_krule rule; 100 }; 101 102 extern int audit_pid; 103 104 #define AUDIT_INODE_BUCKETS 32 105 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 106 107 static inline int audit_hash_ino(u32 ino) 108 { 109 return (ino & (AUDIT_INODE_BUCKETS-1)); 110 } 111 112 extern int audit_match_class(int class, unsigned syscall); 113 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 114 extern int audit_compare_dname_path(const char *dname, const char *path, 115 int *dirlen); 116 extern struct sk_buff * audit_make_reply(int pid, int seq, int type, 117 int done, int multi, 118 void *payload, int size); 119 extern void audit_send_reply(int pid, int seq, int type, 120 int done, int multi, 121 void *payload, int size); 122 extern void audit_panic(const char *message); 123 124 struct audit_netlink_list { 125 int pid; 126 struct sk_buff_head q; 127 }; 128 129 int audit_send_list(void *); 130 131 struct inotify_watch; 132 extern void audit_free_parent(struct inotify_watch *); 133 extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32, 134 const char *, struct inode *); 135 extern int selinux_audit_rule_update(void); 136 137 extern struct mutex audit_filter_mutex; 138 extern void audit_free_rule_rcu(struct rcu_head *); 139 140 #ifdef CONFIG_AUDIT_TREE 141 extern struct audit_chunk *audit_tree_lookup(const struct inode *); 142 extern void audit_put_chunk(struct audit_chunk *); 143 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *); 144 extern int audit_make_tree(struct audit_krule *, char *, u32); 145 extern int audit_add_tree_rule(struct audit_krule *); 146 extern int audit_remove_tree_rule(struct audit_krule *); 147 extern void audit_trim_trees(void); 148 extern int audit_tag_tree(char *old, char *new); 149 extern void audit_schedule_prune(void); 150 extern void audit_prune_trees(void); 151 extern const char *audit_tree_path(struct audit_tree *); 152 extern void audit_put_tree(struct audit_tree *); 153 #else 154 #define audit_remove_tree_rule(rule) BUG() 155 #define audit_add_tree_rule(rule) -EINVAL 156 #define audit_make_tree(rule, str, op) -EINVAL 157 #define audit_trim_trees() (void)0 158 #define audit_put_tree(tree) (void)0 159 #define audit_tag_tree(old, new) -EINVAL 160 #define audit_tree_path(rule) "" /* never called */ 161 #endif 162 163 extern char *audit_unpack_string(void **, size_t *, size_t); 164 165 #ifdef CONFIG_AUDITSYSCALL 166 extern int __audit_signal_info(int sig, struct task_struct *t); 167 static inline int audit_signal_info(int sig, struct task_struct *t) 168 { 169 if (unlikely((audit_pid && t->tgid == audit_pid) || 170 (audit_signals && !audit_dummy_context()))) 171 return __audit_signal_info(sig, t); 172 return 0; 173 } 174 extern enum audit_state audit_filter_inodes(struct task_struct *, 175 struct audit_context *); 176 extern void audit_set_auditable(struct audit_context *); 177 #else 178 #define audit_signal_info(s,t) AUDIT_DISABLED 179 #define audit_filter_inodes(t,c) AUDIT_DISABLED 180 #define audit_set_auditable(c) 181 #endif 182