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_BUILD_CONTEXT, /* Create the per-task audit_context, 40 * and fill it in at syscall 41 * entry time. This makes a full 42 * syscall record available if some 43 * other part of the kernel decides it 44 * should be recorded. */ 45 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, 46 * always fill it in at syscall entry 47 * time, and always write out the audit 48 * record at syscall exit time. */ 49 }; 50 51 /* Rule lists */ 52 struct audit_watch; 53 struct audit_tree; 54 struct audit_chunk; 55 56 struct audit_entry { 57 struct list_head list; 58 struct rcu_head rcu; 59 struct audit_krule rule; 60 }; 61 62 #ifdef CONFIG_AUDIT 63 extern int audit_enabled; 64 extern int audit_ever_enabled; 65 #endif 66 67 extern int audit_pid; 68 69 #define AUDIT_INODE_BUCKETS 32 70 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 71 72 static inline int audit_hash_ino(u32 ino) 73 { 74 return (ino & (AUDIT_INODE_BUCKETS-1)); 75 } 76 77 extern int audit_match_class(int class, unsigned syscall); 78 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 79 extern int audit_compare_dname_path(const char *dname, const char *path, 80 int *dirlen); 81 extern struct sk_buff * audit_make_reply(int pid, int seq, int type, 82 int done, int multi, 83 const void *payload, int size); 84 extern void audit_panic(const char *message); 85 86 struct audit_netlink_list { 87 int pid; 88 struct sk_buff_head q; 89 }; 90 91 int audit_send_list(void *); 92 93 extern int selinux_audit_rule_update(void); 94 95 extern struct mutex audit_filter_mutex; 96 extern void audit_free_rule_rcu(struct rcu_head *); 97 extern struct list_head audit_filter_list[]; 98 99 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); 100 101 /* audit watch functions */ 102 #ifdef CONFIG_AUDIT_WATCH 103 extern void audit_put_watch(struct audit_watch *watch); 104 extern void audit_get_watch(struct audit_watch *watch); 105 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op); 106 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); 107 extern void audit_remove_watch_rule(struct audit_krule *krule); 108 extern char *audit_watch_path(struct audit_watch *watch); 109 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev); 110 #else 111 #define audit_put_watch(w) {} 112 #define audit_get_watch(w) {} 113 #define audit_to_watch(k, p, l, o) (-EINVAL) 114 #define audit_add_watch(k, l) (-EINVAL) 115 #define audit_remove_watch_rule(k) BUG() 116 #define audit_watch_path(w) "" 117 #define audit_watch_compare(w, i, d) 0 118 119 #endif /* CONFIG_AUDIT_WATCH */ 120 121 #ifdef CONFIG_AUDIT_TREE 122 extern struct audit_chunk *audit_tree_lookup(const struct inode *); 123 extern void audit_put_chunk(struct audit_chunk *); 124 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *); 125 extern int audit_make_tree(struct audit_krule *, char *, u32); 126 extern int audit_add_tree_rule(struct audit_krule *); 127 extern int audit_remove_tree_rule(struct audit_krule *); 128 extern void audit_trim_trees(void); 129 extern int audit_tag_tree(char *old, char *new); 130 extern const char *audit_tree_path(struct audit_tree *); 131 extern void audit_put_tree(struct audit_tree *); 132 extern void audit_kill_trees(struct list_head *); 133 #else 134 #define audit_remove_tree_rule(rule) BUG() 135 #define audit_add_tree_rule(rule) -EINVAL 136 #define audit_make_tree(rule, str, op) -EINVAL 137 #define audit_trim_trees() (void)0 138 #define audit_put_tree(tree) (void)0 139 #define audit_tag_tree(old, new) -EINVAL 140 #define audit_tree_path(rule) "" /* never called */ 141 #define audit_kill_trees(list) BUG() 142 #endif 143 144 extern char *audit_unpack_string(void **, size_t *, size_t); 145 146 extern pid_t audit_sig_pid; 147 extern uid_t audit_sig_uid; 148 extern u32 audit_sig_sid; 149 150 #ifdef CONFIG_AUDITSYSCALL 151 extern int __audit_signal_info(int sig, struct task_struct *t); 152 static inline int audit_signal_info(int sig, struct task_struct *t) 153 { 154 if (unlikely((audit_pid && t->tgid == audit_pid) || 155 (audit_signals && !audit_dummy_context()))) 156 return __audit_signal_info(sig, t); 157 return 0; 158 } 159 extern void audit_filter_inodes(struct task_struct *, struct audit_context *); 160 extern struct list_head *audit_killed_trees(void); 161 #else 162 #define audit_signal_info(s,t) AUDIT_DISABLED 163 #define audit_filter_inodes(t,c) AUDIT_DISABLED 164 #endif 165 166 extern struct mutex audit_cmd_mutex; 167