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_watch; 57 struct audit_tree; 58 struct audit_chunk; 59 60 struct audit_entry { 61 struct list_head list; 62 struct rcu_head rcu; 63 struct audit_krule rule; 64 }; 65 66 #ifdef CONFIG_AUDIT 67 extern int audit_enabled; 68 extern int audit_ever_enabled; 69 #endif 70 71 extern int audit_pid; 72 73 #define AUDIT_INODE_BUCKETS 32 74 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 75 76 static inline int audit_hash_ino(u32 ino) 77 { 78 return (ino & (AUDIT_INODE_BUCKETS-1)); 79 } 80 81 extern int audit_match_class(int class, unsigned syscall); 82 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 83 extern int audit_compare_dname_path(const char *dname, const char *path, 84 int *dirlen); 85 extern struct sk_buff * audit_make_reply(int pid, int seq, int type, 86 int done, int multi, 87 void *payload, int size); 88 extern void audit_send_reply(int pid, int seq, int type, 89 int done, int multi, 90 void *payload, int size); 91 extern void audit_panic(const char *message); 92 93 struct audit_netlink_list { 94 int pid; 95 struct sk_buff_head q; 96 }; 97 98 int audit_send_list(void *); 99 100 extern int selinux_audit_rule_update(void); 101 102 extern struct mutex audit_filter_mutex; 103 extern void audit_free_rule_rcu(struct rcu_head *); 104 extern struct list_head audit_filter_list[]; 105 106 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); 107 108 /* audit watch functions */ 109 #ifdef CONFIG_AUDIT_WATCH 110 extern void audit_put_watch(struct audit_watch *watch); 111 extern void audit_get_watch(struct audit_watch *watch); 112 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op); 113 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); 114 extern void audit_remove_watch_rule(struct audit_krule *krule); 115 extern char *audit_watch_path(struct audit_watch *watch); 116 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev); 117 #else 118 #define audit_put_watch(w) {} 119 #define audit_get_watch(w) {} 120 #define audit_to_watch(k, p, l, o) (-EINVAL) 121 #define audit_add_watch(k, l) (-EINVAL) 122 #define audit_remove_watch_rule(k) BUG() 123 #define audit_watch_path(w) "" 124 #define audit_watch_compare(w, i, d) 0 125 126 #endif /* CONFIG_AUDIT_WATCH */ 127 128 #ifdef CONFIG_AUDIT_TREE 129 extern struct audit_chunk *audit_tree_lookup(const struct inode *); 130 extern void audit_put_chunk(struct audit_chunk *); 131 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *); 132 extern int audit_make_tree(struct audit_krule *, char *, u32); 133 extern int audit_add_tree_rule(struct audit_krule *); 134 extern int audit_remove_tree_rule(struct audit_krule *); 135 extern void audit_trim_trees(void); 136 extern int audit_tag_tree(char *old, char *new); 137 extern const char *audit_tree_path(struct audit_tree *); 138 extern void audit_put_tree(struct audit_tree *); 139 extern void audit_kill_trees(struct list_head *); 140 #else 141 #define audit_remove_tree_rule(rule) BUG() 142 #define audit_add_tree_rule(rule) -EINVAL 143 #define audit_make_tree(rule, str, op) -EINVAL 144 #define audit_trim_trees() (void)0 145 #define audit_put_tree(tree) (void)0 146 #define audit_tag_tree(old, new) -EINVAL 147 #define audit_tree_path(rule) "" /* never called */ 148 #define audit_kill_trees(list) BUG() 149 #endif 150 151 extern char *audit_unpack_string(void **, size_t *, size_t); 152 153 extern pid_t audit_sig_pid; 154 extern uid_t audit_sig_uid; 155 extern u32 audit_sig_sid; 156 157 #ifdef CONFIG_AUDITSYSCALL 158 extern int __audit_signal_info(int sig, struct task_struct *t); 159 static inline int audit_signal_info(int sig, struct task_struct *t) 160 { 161 if (unlikely((audit_pid && t->tgid == audit_pid) || 162 (audit_signals && !audit_dummy_context()))) 163 return __audit_signal_info(sig, t); 164 return 0; 165 } 166 extern void audit_filter_inodes(struct task_struct *, struct audit_context *); 167 extern struct list_head *audit_killed_trees(void); 168 #else 169 #define audit_signal_info(s,t) AUDIT_DISABLED 170 #define audit_filter_inodes(t,c) AUDIT_DISABLED 171 #endif 172 173 extern struct mutex audit_cmd_mutex; 174