1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* audit -- definition of audit_context structure and supporting types
4 * Copyright 2003-2004 Red Hat, Inc.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright 2005 IBM Corporation
10 #include <linux/audit.h>
11 #include <linux/skbuff.h>
12 #include <linux/security.h>
13 #include <uapi/linux/mqueue.h>
14 #include <linux/tty.h>
16 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
17 * for saving names from getname(). If we get more names we will allocate
18 * a name dynamically and also add those to the list anchored by names_list. */
21 /* At task start time, the audit_state is set in the audit_context using
22 a per-task filter. At syscall entry, the audit_state is augmented by
23 the syscall filter. */
25 AUDIT_DISABLED
, /* Do not create per-task audit_context.
26 * No syscall-specific audit records can
28 AUDIT_BUILD_CONTEXT
, /* Create the per-task audit_context,
29 * and fill it in at syscall
30 * entry time. This makes a full
31 * syscall record available if some
32 * other part of the kernel decides it
33 * should be recorded. */
34 AUDIT_RECORD_CONTEXT
/* Create the per-task audit_context,
35 * always fill it in at syscall entry
36 * time, and always write out the audit
37 * record at syscall exit time. */
42 struct audit_fsnotify_mark
;
47 struct list_head list
;
49 struct audit_krule rule
;
52 struct audit_cap_data
{
53 kernel_cap_t permitted
;
54 kernel_cap_t inheritable
;
56 unsigned int fE
; /* effective bit of file cap */
57 kernel_cap_t effective
; /* effective set of process */
63 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
64 * the refcnt in the associated filename struct.
66 * Further, in fs/namei.c:path_lookup() we store the inode and device.
69 struct list_head list
; /* audit_context->names_list */
71 struct filename
*name
;
72 int name_len
; /* number of chars to log */
73 bool hidden
; /* don't log this record */
82 struct audit_cap_data fcap
;
83 unsigned int fcap_ver
;
84 unsigned char type
; /* record type */
86 * This was an allocated audit_names and not from the array of
87 * names allocated in the task audit context. Thus this name
88 * should be freed on syscall exit.
93 struct audit_proctitle
{
94 int len
; /* length of the cmdline field. */
95 char *value
; /* the cmdline field */
98 /* The per-task audit context. */
99 struct audit_context
{
100 int dummy
; /* must be the first element */
101 int in_syscall
; /* 1 if task is in a syscall */
102 enum audit_state state
, current_state
;
103 unsigned int serial
; /* serial number for record */
104 int major
; /* syscall number */
105 struct timespec64 ctime
; /* time of syscall entry */
106 unsigned long argv
[4]; /* syscall arguments */
107 long return_code
;/* syscall return code */
109 int return_valid
; /* return code is valid */
111 * The names_list is the list of all audit_names collected during this
112 * syscall. The first AUDIT_NAMES entries in the names_list will
113 * actually be from the preallocated_names array for performance
114 * reasons. Except during allocation they should never be referenced
115 * through the preallocated_names array and should only be found/used
116 * by running the names_list.
118 struct audit_names preallocated_names
[AUDIT_NAMES
];
119 int name_count
; /* total records in names_list */
120 struct list_head names_list
; /* struct audit_names->list anchor */
121 char *filterkey
; /* key for rule that triggered record */
123 struct audit_aux_data
*aux
;
124 struct audit_aux_data
*aux_pids
;
125 struct sockaddr_storage
*sockaddr
;
127 /* Save things to print about task_struct */
129 kuid_t uid
, euid
, suid
, fsuid
;
130 kgid_t gid
, egid
, sgid
, fsgid
;
131 unsigned long personality
;
137 unsigned int target_sessionid
;
138 struct lsmblob target_lsm
;
139 char target_comm
[TASK_COMM_LEN
];
141 struct audit_tree_refs
*trees
, *first_trees
;
142 struct list_head killed_trees
;
155 struct lsmblob oblob
;
160 unsigned long qbytes
;
164 struct mq_attr mqstat
;
173 unsigned int msg_prio
;
174 struct timespec64 abs_timeout
;
183 struct audit_cap_data cap
;
197 struct audit_proctitle proctitle
;
200 extern bool audit_ever_enabled
;
202 extern void audit_log_session_info(struct audit_buffer
*ab
);
204 extern int auditd_test_task(struct task_struct
*task
);
206 #define AUDIT_INODE_BUCKETS 32
207 extern struct list_head audit_inode_hash
[AUDIT_INODE_BUCKETS
];
209 static inline int audit_hash_ino(u32 ino
)
211 return (ino
& (AUDIT_INODE_BUCKETS
-1));
214 /* Indicates that audit should log the full pathname. */
215 #define AUDIT_NAME_FULL -1
217 extern int audit_match_class(int class, unsigned syscall
);
218 extern int audit_comparator(const u32 left
, const u32 op
, const u32 right
);
219 extern int audit_uid_comparator(kuid_t left
, u32 op
, kuid_t right
);
220 extern int audit_gid_comparator(kgid_t left
, u32 op
, kgid_t right
);
221 extern int parent_len(const char *path
);
222 extern int audit_compare_dname_path(const struct qstr
*dname
, const char *path
, int plen
);
223 extern struct sk_buff
*audit_make_reply(int seq
, int type
, int done
, int multi
,
224 const void *payload
, int size
);
225 extern void audit_panic(const char *message
);
227 struct audit_netlink_list
{
230 struct sk_buff_head q
;
233 int audit_send_list_thread(void *_dest
);
235 extern int selinux_audit_rule_update(void);
237 extern struct mutex audit_filter_mutex
;
238 extern int audit_del_rule(struct audit_entry
*entry
);
239 extern void audit_free_rule_rcu(struct rcu_head
*head
);
240 extern struct list_head audit_filter_list
[];
242 extern struct audit_entry
*audit_dupe_rule(struct audit_krule
*old
);
244 extern void audit_log_d_path_exe(struct audit_buffer
*ab
,
245 struct mm_struct
*mm
);
247 extern struct tty_struct
*audit_get_tty(void);
248 extern void audit_put_tty(struct tty_struct
*tty
);
250 /* audit watch/mark/tree functions */
251 #ifdef CONFIG_AUDITSYSCALL
252 extern unsigned int audit_serial(void);
253 extern int auditsc_get_stamp(struct audit_context
*ctx
,
254 struct timespec64
*t
, unsigned int *serial
);
256 extern void audit_put_watch(struct audit_watch
*watch
);
257 extern void audit_get_watch(struct audit_watch
*watch
);
258 extern int audit_to_watch(struct audit_krule
*krule
, char *path
, int len
,
260 extern int audit_add_watch(struct audit_krule
*krule
, struct list_head
**list
);
261 extern void audit_remove_watch_rule(struct audit_krule
*krule
);
262 extern char *audit_watch_path(struct audit_watch
*watch
);
263 extern int audit_watch_compare(struct audit_watch
*watch
, unsigned long ino
,
266 extern struct audit_fsnotify_mark
*audit_alloc_mark(struct audit_krule
*krule
,
267 char *pathname
, int len
);
268 extern char *audit_mark_path(struct audit_fsnotify_mark
*mark
);
269 extern void audit_remove_mark(struct audit_fsnotify_mark
*audit_mark
);
270 extern void audit_remove_mark_rule(struct audit_krule
*krule
);
271 extern int audit_mark_compare(struct audit_fsnotify_mark
*mark
,
272 unsigned long ino
, dev_t dev
);
273 extern int audit_dupe_exe(struct audit_krule
*new, struct audit_krule
*old
);
274 extern int audit_exe_compare(struct task_struct
*tsk
,
275 struct audit_fsnotify_mark
*mark
);
277 extern struct audit_chunk
*audit_tree_lookup(const struct inode
*inode
);
278 extern void audit_put_chunk(struct audit_chunk
*chunk
);
279 extern bool audit_tree_match(struct audit_chunk
*chunk
,
280 struct audit_tree
*tree
);
281 extern int audit_make_tree(struct audit_krule
*rule
, char *pathname
, u32 op
);
282 extern int audit_add_tree_rule(struct audit_krule
*rule
);
283 extern int audit_remove_tree_rule(struct audit_krule
*rule
);
284 extern void audit_trim_trees(void);
285 extern int audit_tag_tree(char *old
, char *new);
286 extern const char *audit_tree_path(struct audit_tree
*tree
);
287 extern void audit_put_tree(struct audit_tree
*tree
);
288 extern void audit_kill_trees(struct audit_context
*context
);
290 extern int audit_signal_info_syscall(struct task_struct
*t
);
291 extern void audit_filter_inodes(struct task_struct
*tsk
,
292 struct audit_context
*ctx
);
293 extern struct list_head
*audit_killed_trees(void);
294 #else /* CONFIG_AUDITSYSCALL */
295 #define auditsc_get_stamp(c, t, s) 0
296 #define audit_put_watch(w) {}
297 #define audit_get_watch(w) {}
298 #define audit_to_watch(k, p, l, o) (-EINVAL)
299 #define audit_add_watch(k, l) (-EINVAL)
300 #define audit_remove_watch_rule(k) BUG()
301 #define audit_watch_path(w) ""
302 #define audit_watch_compare(w, i, d) 0
304 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
305 #define audit_mark_path(m) ""
306 #define audit_remove_mark(m)
307 #define audit_remove_mark_rule(k)
308 #define audit_mark_compare(m, i, d) 0
309 #define audit_exe_compare(t, m) (-EINVAL)
310 #define audit_dupe_exe(n, o) (-EINVAL)
312 #define audit_remove_tree_rule(rule) BUG()
313 #define audit_add_tree_rule(rule) -EINVAL
314 #define audit_make_tree(rule, str, op) -EINVAL
315 #define audit_trim_trees() (void)0
316 #define audit_put_tree(tree) (void)0
317 #define audit_tag_tree(old, new) -EINVAL
318 #define audit_tree_path(rule) "" /* never called */
319 #define audit_kill_trees(context) BUG()
321 static inline int audit_signal_info_syscall(struct task_struct
*t
)
326 #define audit_filter_inodes(t, c) AUDIT_DISABLED
327 #endif /* CONFIG_AUDITSYSCALL */
329 extern char *audit_unpack_string(void **bufp
, size_t *remain
, size_t len
);
331 extern struct lsmblob audit_sig_lsm
;
333 extern int audit_filter(int msgtype
, unsigned int listtype
);
335 extern void audit_ctl_lock(void);
336 extern void audit_ctl_unlock(void);