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
9 #ifndef _KERNEL_AUDIT_H_
10 #define _KERNEL_AUDIT_H_
13 #include <linux/audit.h>
14 #include <linux/skbuff.h>
15 #include <uapi/linux/mqueue.h>
16 #include <linux/tty.h>
17 #include <uapi/linux/openat2.h> // struct open_how
19 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
20 * for saving names from getname(). If we get more names we will allocate
21 * a name dynamically and also add those to the list anchored by names_list. */
24 /* At task start time, the audit_state is set in the audit_context using
25 a per-task filter. At syscall entry, the audit_state is augmented by
26 the syscall filter. */
28 AUDIT_STATE_DISABLED, /* Do not create per-task audit_context.
29 * No syscall-specific audit records can
31 AUDIT_STATE_BUILD, /* Create the per-task audit_context,
32 * and fill it in at syscall
33 * entry time. This makes a full
34 * syscall record available if some
35 * other part of the kernel decides it
36 * should be recorded. */
37 AUDIT_STATE_RECORD /* Create the per-task audit_context,
38 * always fill it in at syscall entry
39 * time, and always write out the audit
40 * record at syscall exit time. */
45 struct audit_fsnotify_mark;
50 struct list_head list;
52 struct audit_krule rule;
55 struct audit_cap_data {
56 kernel_cap_t permitted;
57 kernel_cap_t inheritable;
59 unsigned int fE; /* effective bit of file cap */
60 kernel_cap_t effective; /* effective set of process */
66 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
67 * the refcnt in the associated filename struct.
69 * Further, in fs/namei.c:path_lookup() we store the inode and device.
72 struct list_head list; /* audit_context->names_list */
74 struct filename *name;
75 int name_len; /* number of chars to log */
76 bool hidden; /* don't log this record */
85 struct audit_cap_data fcap;
86 unsigned int fcap_ver;
87 unsigned char type; /* record type */
89 * This was an allocated audit_names and not from the array of
90 * names allocated in the task audit context. Thus this name
91 * should be freed on syscall exit.
96 struct audit_proctitle {
97 int len; /* length of the cmdline field. */
98 char *value; /* the cmdline field */
101 /* The per-task audit context. */
102 struct audit_context {
103 int dummy; /* must be the first element */
105 AUDIT_CTX_UNUSED, /* audit_context is currently unused */
106 AUDIT_CTX_SYSCALL, /* in use by syscall */
107 AUDIT_CTX_URING, /* in use by io_uring */
109 enum audit_state state, current_state;
110 unsigned int serial; /* serial number for record */
111 int major; /* syscall number */
112 int uring_op; /* uring operation */
113 struct timespec64 ctime; /* time of syscall entry */
114 unsigned long argv[4]; /* syscall arguments */
115 long return_code;/* syscall return code */
117 int return_valid; /* return code is valid */
119 * The names_list is the list of all audit_names collected during this
120 * syscall. The first AUDIT_NAMES entries in the names_list will
121 * actually be from the preallocated_names array for performance
122 * reasons. Except during allocation they should never be referenced
123 * through the preallocated_names array and should only be found/used
124 * by running the names_list.
126 struct audit_names preallocated_names[AUDIT_NAMES];
127 int name_count; /* total records in names_list */
128 struct list_head names_list; /* struct audit_names->list anchor */
129 char *filterkey; /* key for rule that triggered record */
131 struct audit_aux_data *aux;
132 struct audit_aux_data *aux_pids;
133 struct sockaddr_storage *sockaddr;
135 /* Save things to print about task_struct */
137 kuid_t uid, euid, suid, fsuid;
138 kgid_t gid, egid, sgid, fsgid;
139 unsigned long personality;
145 unsigned int target_sessionid;
147 char target_comm[TASK_COMM_LEN];
149 struct audit_tree_refs *trees, *first_trees;
150 struct list_head killed_trees;
168 unsigned long qbytes;
172 struct mq_attr mqstat;
181 unsigned int msg_prio;
182 struct timespec64 abs_timeout;
191 struct audit_cap_data cap;
197 struct open_how openat2;
205 struct audit_ntp_data ntp_data;
206 struct timespec64 tk_injoffset;
210 struct audit_proctitle proctitle;
213 extern bool audit_ever_enabled;
215 extern void audit_log_session_info(struct audit_buffer *ab);
217 extern int auditd_test_task(struct task_struct *task);
219 #define AUDIT_INODE_BUCKETS 32
220 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
222 static inline int audit_hash_ino(u32 ino)
224 return (ino & (AUDIT_INODE_BUCKETS-1));
227 /* Indicates that audit should log the full pathname. */
228 #define AUDIT_NAME_FULL -1
230 extern int audit_match_class(int class, unsigned syscall);
231 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
232 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
233 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
234 extern int parent_len(const char *path);
235 extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen);
236 extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
237 const void *payload, int size);
238 extern void audit_panic(const char *message);
240 struct audit_netlink_list {
243 struct sk_buff_head q;
246 int audit_send_list_thread(void *_dest);
248 extern int selinux_audit_rule_update(void);
250 extern struct mutex audit_filter_mutex;
251 extern int audit_del_rule(struct audit_entry *entry);
252 extern void audit_free_rule_rcu(struct rcu_head *head);
253 extern struct list_head audit_filter_list[];
255 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
257 extern void audit_log_d_path_exe(struct audit_buffer *ab,
258 struct mm_struct *mm);
260 extern struct tty_struct *audit_get_tty(void);
261 extern void audit_put_tty(struct tty_struct *tty);
263 /* audit watch/mark/tree functions */
264 #ifdef CONFIG_AUDITSYSCALL
265 extern unsigned int audit_serial(void);
266 extern int auditsc_get_stamp(struct audit_context *ctx,
267 struct timespec64 *t, unsigned int *serial);
269 extern void audit_put_watch(struct audit_watch *watch);
270 extern void audit_get_watch(struct audit_watch *watch);
271 extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
273 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
274 extern void audit_remove_watch_rule(struct audit_krule *krule);
275 extern char *audit_watch_path(struct audit_watch *watch);
276 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
279 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
280 char *pathname, int len);
281 extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
282 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
283 extern void audit_remove_mark_rule(struct audit_krule *krule);
284 extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
285 unsigned long ino, dev_t dev);
286 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
287 extern int audit_exe_compare(struct task_struct *tsk,
288 struct audit_fsnotify_mark *mark);
290 extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
291 extern void audit_put_chunk(struct audit_chunk *chunk);
292 extern bool audit_tree_match(struct audit_chunk *chunk,
293 struct audit_tree *tree);
294 extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
295 extern int audit_add_tree_rule(struct audit_krule *rule);
296 extern int audit_remove_tree_rule(struct audit_krule *rule);
297 extern void audit_trim_trees(void);
298 extern int audit_tag_tree(char *old, char *new);
299 extern const char *audit_tree_path(struct audit_tree *tree);
300 extern void audit_put_tree(struct audit_tree *tree);
301 extern void audit_kill_trees(struct audit_context *context);
303 extern int audit_signal_info_syscall(struct task_struct *t);
304 extern void audit_filter_inodes(struct task_struct *tsk,
305 struct audit_context *ctx);
306 extern struct list_head *audit_killed_trees(void);
307 #else /* CONFIG_AUDITSYSCALL */
308 #define auditsc_get_stamp(c, t, s) 0
309 #define audit_put_watch(w) do { } while (0)
310 #define audit_get_watch(w) do { } while (0)
311 #define audit_to_watch(k, p, l, o) (-EINVAL)
312 #define audit_add_watch(k, l) (-EINVAL)
313 #define audit_remove_watch_rule(k) BUG()
314 #define audit_watch_path(w) ""
315 #define audit_watch_compare(w, i, d) 0
317 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
318 #define audit_mark_path(m) ""
319 #define audit_remove_mark(m) do { } while (0)
320 #define audit_remove_mark_rule(k) do { } while (0)
321 #define audit_mark_compare(m, i, d) 0
322 #define audit_exe_compare(t, m) (-EINVAL)
323 #define audit_dupe_exe(n, o) (-EINVAL)
325 #define audit_remove_tree_rule(rule) BUG()
326 #define audit_add_tree_rule(rule) -EINVAL
327 #define audit_make_tree(rule, str, op) -EINVAL
328 #define audit_trim_trees() do { } while (0)
329 #define audit_put_tree(tree) do { } while (0)
330 #define audit_tag_tree(old, new) -EINVAL
331 #define audit_tree_path(rule) "" /* never called */
332 #define audit_kill_trees(context) BUG()
334 static inline int audit_signal_info_syscall(struct task_struct *t)
339 #define audit_filter_inodes(t, c) AUDIT_STATE_DISABLED
340 #endif /* CONFIG_AUDITSYSCALL */
342 extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
344 extern int audit_filter(int msgtype, unsigned int listtype);
346 extern void audit_ctl_lock(void);
347 extern void audit_ctl_unlock(void);