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_krule { 77 int vers_ops; 78 u32 flags; 79 u32 listnr; 80 u32 action; 81 u32 mask[AUDIT_BITMASK_SIZE]; 82 u32 buflen; /* for data alloc on list rules */ 83 u32 field_count; 84 char *filterkey; /* ties events to rules */ 85 struct audit_field *fields; 86 struct audit_field *inode_f; /* quick access to an inode field */ 87 struct audit_watch *watch; /* associated watch */ 88 struct list_head rlist; /* entry in audit_watch.rules list */ 89 }; 90 91 struct audit_entry { 92 struct list_head list; 93 struct rcu_head rcu; 94 struct audit_krule rule; 95 }; 96 97 extern int audit_pid; 98 99 #define AUDIT_INODE_BUCKETS 32 100 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 101 102 static inline int audit_hash_ino(u32 ino) 103 { 104 return (ino & (AUDIT_INODE_BUCKETS-1)); 105 } 106 107 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 108 extern int audit_compare_dname_path(const char *dname, const char *path, 109 int *dirlen); 110 extern struct sk_buff * audit_make_reply(int pid, int seq, int type, 111 int done, int multi, 112 void *payload, int size); 113 extern void audit_send_reply(int pid, int seq, int type, 114 int done, int multi, 115 void *payload, int size); 116 extern void audit_log_lost(const char *message); 117 extern void audit_panic(const char *message); 118 119 struct audit_netlink_list { 120 int pid; 121 struct sk_buff_head q; 122 }; 123 124 int audit_send_list(void *); 125 126 struct inotify_watch; 127 extern void audit_free_parent(struct inotify_watch *); 128 extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32, 129 const char *, struct inode *); 130 extern int selinux_audit_rule_update(void); 131 132 #ifdef CONFIG_AUDITSYSCALL 133 extern void __audit_signal_info(int sig, struct task_struct *t); 134 static inline void audit_signal_info(int sig, struct task_struct *t) 135 { 136 if (unlikely(audit_pid && t->tgid == audit_pid)) 137 __audit_signal_info(sig, t); 138 } 139 extern enum audit_state audit_filter_inodes(struct task_struct *, 140 struct audit_context *); 141 extern void audit_set_auditable(struct audit_context *); 142 #else 143 #define audit_signal_info(s,t) 144 #define audit_filter_inodes(t,c) AUDIT_DISABLED 145 #define audit_set_auditable(c) 146 #endif 147