1 /* audit -- definition of audit_context structure and supporting types
3 * Copyright 2003-2004 Red Hat, Inc.
4 * Copyright 2005 Hewlett-Packard Development Company, L.P.
5 * Copyright 2005 IBM Corporation
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.
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.
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
23 #include <linux/audit.h>
24 #include <linux/skbuff.h>
25 #include <uapi/linux/mqueue.h>
26 #include <linux/tty.h>
28 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
29 * for saving names from getname(). If we get more names we will allocate
30 * a name dynamically and also add those to the list anchored by names_list. */
33 /* At task start time, the audit_state is set in the audit_context using
34 a per-task filter. At syscall entry, the audit_state is augmented by
35 the syscall filter. */
37 AUDIT_DISABLED, /* Do not create per-task audit_context.
38 * No syscall-specific audit records can
40 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
41 * and fill it in at syscall
42 * entry time. This makes a full
43 * syscall record available if some
44 * other part of the kernel decides it
45 * should be recorded. */
46 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
47 * always fill it in at syscall entry
48 * time, and always write out the audit
49 * record at syscall exit time. */
54 struct audit_fsnotify_mark;
59 struct list_head list;
61 struct audit_krule rule;
64 struct audit_cap_data {
65 kernel_cap_t permitted;
66 kernel_cap_t inheritable;
68 unsigned int fE; /* effective bit of file cap */
69 kernel_cap_t effective; /* effective set of process */
75 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
76 * the refcnt in the associated filename struct.
78 * Further, in fs/namei.c:path_lookup() we store the inode and device.
81 struct list_head list; /* audit_context->names_list */
83 struct filename *name;
84 int name_len; /* number of chars to log */
85 bool hidden; /* don't log this record */
94 struct audit_cap_data fcap;
95 unsigned int fcap_ver;
96 unsigned char type; /* record type */
98 * This was an allocated audit_names and not from the array of
99 * names allocated in the task audit context. Thus this name
100 * should be freed on syscall exit.
105 struct audit_proctitle {
106 int len; /* length of the cmdline field. */
107 char *value; /* the cmdline field */
110 /* The per-task audit context. */
111 struct audit_context {
112 int dummy; /* must be the first element */
113 int in_syscall; /* 1 if task is in a syscall */
114 enum audit_state state, current_state;
115 unsigned int serial; /* serial number for record */
116 int major; /* syscall number */
117 struct timespec64 ctime; /* time of syscall entry */
118 unsigned long argv[4]; /* syscall arguments */
119 long return_code;/* syscall return code */
121 int return_valid; /* return code is valid */
123 * The names_list is the list of all audit_names collected during this
124 * syscall. The first AUDIT_NAMES entries in the names_list will
125 * actually be from the preallocated_names array for performance
126 * reasons. Except during allocation they should never be referenced
127 * through the preallocated_names array and should only be found/used
128 * by running the names_list.
130 struct audit_names preallocated_names[AUDIT_NAMES];
131 int name_count; /* total records in names_list */
132 struct list_head names_list; /* struct audit_names->list anchor */
133 char *filterkey; /* key for rule that triggered record */
135 struct audit_aux_data *aux;
136 struct audit_aux_data *aux_pids;
137 struct sockaddr_storage *sockaddr;
139 /* Save things to print about task_struct */
141 kuid_t uid, euid, suid, fsuid;
142 kgid_t gid, egid, sgid, fsgid;
143 unsigned long personality;
149 unsigned int target_sessionid;
151 char target_comm[TASK_COMM_LEN];
153 struct audit_tree_refs *trees, *first_trees;
154 struct list_head killed_trees;
172 unsigned long qbytes;
176 struct mq_attr mqstat;
185 unsigned int msg_prio;
186 struct timespec64 abs_timeout;
195 struct audit_cap_data cap;
209 struct audit_proctitle proctitle;
212 extern bool audit_ever_enabled;
214 extern void audit_log_session_info(struct audit_buffer *ab);
216 extern void audit_copy_inode(struct audit_names *name,
217 const struct dentry *dentry,
218 struct inode *inode);
219 extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
221 extern void audit_log_name(struct audit_context *context,
222 struct audit_names *n, const struct path *path,
223 int record_num, int *call_panic);
225 extern int auditd_test_task(struct task_struct *task);
227 #define AUDIT_INODE_BUCKETS 32
228 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
230 static inline int audit_hash_ino(u32 ino)
232 return (ino & (AUDIT_INODE_BUCKETS-1));
235 /* Indicates that audit should log the full pathname. */
236 #define AUDIT_NAME_FULL -1
238 extern int audit_match_class(int class, unsigned syscall);
239 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
240 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
241 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
242 extern int parent_len(const char *path);
243 extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
244 extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
245 const void *payload, int size);
246 extern void audit_panic(const char *message);
248 struct audit_netlink_list {
251 struct sk_buff_head q;
254 int audit_send_list(void *_dest);
256 extern int selinux_audit_rule_update(void);
258 extern struct mutex audit_filter_mutex;
259 extern int audit_del_rule(struct audit_entry *entry);
260 extern void audit_free_rule_rcu(struct rcu_head *head);
261 extern struct list_head audit_filter_list[];
263 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
265 extern void audit_log_d_path_exe(struct audit_buffer *ab,
266 struct mm_struct *mm);
268 extern struct tty_struct *audit_get_tty(void);
269 extern void audit_put_tty(struct tty_struct *tty);
271 /* audit watch functions */
272 #ifdef CONFIG_AUDITSYSCALL
273 extern void audit_put_watch(struct audit_watch *watch);
274 extern void audit_get_watch(struct audit_watch *watch);
275 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
276 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
277 extern void audit_remove_watch_rule(struct audit_krule *krule);
278 extern char *audit_watch_path(struct audit_watch *watch);
279 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
281 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pathname, int len);
282 extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
283 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
284 extern void audit_remove_mark_rule(struct audit_krule *krule);
285 extern int audit_mark_compare(struct audit_fsnotify_mark *mark, 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, struct audit_fsnotify_mark *mark);
290 #define audit_put_watch(w) {}
291 #define audit_get_watch(w) {}
292 #define audit_to_watch(k, p, l, o) (-EINVAL)
293 #define audit_add_watch(k, l) (-EINVAL)
294 #define audit_remove_watch_rule(k) BUG()
295 #define audit_watch_path(w) ""
296 #define audit_watch_compare(w, i, d) 0
298 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
299 #define audit_mark_path(m) ""
300 #define audit_remove_mark(m)
301 #define audit_remove_mark_rule(k)
302 #define audit_mark_compare(m, i, d) 0
303 #define audit_exe_compare(t, m) (-EINVAL)
304 #define audit_dupe_exe(n, o) (-EINVAL)
305 #endif /* CONFIG_AUDITSYSCALL */
307 #ifdef CONFIG_AUDITSYSCALL
308 extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
309 extern void audit_put_chunk(struct audit_chunk *chunk);
310 extern bool audit_tree_match(struct audit_chunk *chunk, struct audit_tree *tree);
311 extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
312 extern int audit_add_tree_rule(struct audit_krule *rule);
313 extern int audit_remove_tree_rule(struct audit_krule *rule);
314 extern void audit_trim_trees(void);
315 extern int audit_tag_tree(char *old, char *new);
316 extern const char *audit_tree_path(struct audit_tree *tree);
317 extern void audit_put_tree(struct audit_tree *tree);
318 extern void audit_kill_trees(struct audit_context *context);
320 #define audit_remove_tree_rule(rule) BUG()
321 #define audit_add_tree_rule(rule) -EINVAL
322 #define audit_make_tree(rule, str, op) -EINVAL
323 #define audit_trim_trees() (void)0
324 #define audit_put_tree(tree) (void)0
325 #define audit_tag_tree(old, new) -EINVAL
326 #define audit_tree_path(rule) "" /* never called */
327 #define audit_kill_trees(context) BUG()
330 extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
332 extern pid_t audit_sig_pid;
333 extern kuid_t audit_sig_uid;
334 extern u32 audit_sig_sid;
336 extern int audit_filter(int msgtype, unsigned int listtype);
338 #ifdef CONFIG_AUDITSYSCALL
339 extern int audit_signal_info(int sig, struct task_struct *t);
340 extern void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx);
341 extern struct list_head *audit_killed_trees(void);
343 #define audit_signal_info(s,t) AUDIT_DISABLED
344 #define audit_filter_inodes(t,c) AUDIT_DISABLED
347 extern void audit_ctl_lock(void);
348 extern void audit_ctl_unlock(void);