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_tree; 69 struct audit_chunk; 70 71 struct audit_entry { 72 struct list_head list; 73 struct rcu_head rcu; 74 struct audit_krule rule; 75 }; 76 77 #ifdef CONFIG_AUDIT 78 extern int audit_enabled; 79 extern int audit_ever_enabled; 80 #endif 81 82 extern int audit_pid; 83 84 #define AUDIT_INODE_BUCKETS 32 85 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 86 87 static inline int audit_hash_ino(u32 ino) 88 { 89 return (ino & (AUDIT_INODE_BUCKETS-1)); 90 } 91 92 extern int audit_match_class(int class, unsigned syscall); 93 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 94 extern int audit_compare_dname_path(const char *dname, const char *path, 95 int *dirlen); 96 extern struct sk_buff * audit_make_reply(int pid, int seq, int type, 97 int done, int multi, 98 void *payload, int size); 99 extern void audit_send_reply(int pid, int seq, int type, 100 int done, int multi, 101 void *payload, int size); 102 extern void audit_panic(const char *message); 103 104 struct audit_netlink_list { 105 int pid; 106 struct sk_buff_head q; 107 }; 108 109 int audit_send_list(void *); 110 111 struct inotify_watch; 112 /* Inotify handle */ 113 extern struct inotify_handle *audit_ih; 114 115 extern void audit_free_parent(struct inotify_watch *); 116 extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32, 117 const char *, struct inode *); 118 extern int selinux_audit_rule_update(void); 119 120 extern struct mutex audit_filter_mutex; 121 extern void audit_free_rule_rcu(struct rcu_head *); 122 extern struct list_head audit_filter_list[]; 123 124 #ifdef CONFIG_AUDIT_TREE 125 extern struct audit_chunk *audit_tree_lookup(const struct inode *); 126 extern void audit_put_chunk(struct audit_chunk *); 127 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *); 128 extern int audit_make_tree(struct audit_krule *, char *, u32); 129 extern int audit_add_tree_rule(struct audit_krule *); 130 extern int audit_remove_tree_rule(struct audit_krule *); 131 extern void audit_trim_trees(void); 132 extern int audit_tag_tree(char *old, char *new); 133 extern void audit_schedule_prune(void); 134 extern void audit_prune_trees(void); 135 extern const char *audit_tree_path(struct audit_tree *); 136 extern void audit_put_tree(struct audit_tree *); 137 #else 138 #define audit_remove_tree_rule(rule) BUG() 139 #define audit_add_tree_rule(rule) -EINVAL 140 #define audit_make_tree(rule, str, op) -EINVAL 141 #define audit_trim_trees() (void)0 142 #define audit_put_tree(tree) (void)0 143 #define audit_tag_tree(old, new) -EINVAL 144 #define audit_tree_path(rule) "" /* never called */ 145 #endif 146 147 extern char *audit_unpack_string(void **, size_t *, size_t); 148 149 extern pid_t audit_sig_pid; 150 extern uid_t audit_sig_uid; 151 extern u32 audit_sig_sid; 152 153 #ifdef CONFIG_AUDITSYSCALL 154 extern int __audit_signal_info(int sig, struct task_struct *t); 155 static inline int audit_signal_info(int sig, struct task_struct *t) 156 { 157 if (unlikely((audit_pid && t->tgid == audit_pid) || 158 (audit_signals && !audit_dummy_context()))) 159 return __audit_signal_info(sig, t); 160 return 0; 161 } 162 extern enum audit_state audit_filter_inodes(struct task_struct *, 163 struct audit_context *); 164 extern void audit_set_auditable(struct audit_context *); 165 #else 166 #define audit_signal_info(s,t) AUDIT_DISABLED 167 #define audit_filter_inodes(t,c) AUDIT_DISABLED 168 #define audit_set_auditable(c) 169 #endif 170