1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* audit -- definition of audit_context structure and supporting types
3 *
4 * Copyright 2003-2004 Red Hat, Inc.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright 2005 IBM Corporation
7 */
8
9 #ifndef _KERNEL_AUDIT_H_
10 #define _KERNEL_AUDIT_H_
11
12 #include <linux/fs.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
18
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. */
22 #define AUDIT_NAMES 5
23
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. */
27 enum audit_state {
28 AUDIT_STATE_DISABLED, /* Do not create per-task audit_context.
29 * No syscall-specific audit records can
30 * be generated. */
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. */
41 };
42
43 /* Rule lists */
44 struct audit_watch;
45 struct audit_fsnotify_mark;
46 struct audit_tree;
47 struct audit_chunk;
48
49 struct audit_entry {
50 struct list_head list;
51 struct rcu_head rcu;
52 struct audit_krule rule;
53 };
54
55 struct audit_cap_data {
56 kernel_cap_t permitted;
57 kernel_cap_t inheritable;
58 union {
59 unsigned int fE; /* effective bit of file cap */
60 kernel_cap_t effective; /* effective set of process */
61 };
62 kernel_cap_t ambient;
63 kuid_t rootid;
64 };
65
66 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
67 * the refcnt in the associated filename struct.
68 *
69 * Further, in fs/namei.c:path_lookup() we store the inode and device.
70 */
71 struct audit_names {
72 struct list_head list; /* audit_context->names_list */
73
74 struct filename *name;
75 int name_len; /* number of chars to log */
76 bool hidden; /* don't log this record */
77
78 unsigned long ino;
79 dev_t dev;
80 umode_t mode;
81 kuid_t uid;
82 kgid_t gid;
83 dev_t rdev;
84 u32 osid;
85 struct audit_cap_data fcap;
86 unsigned int fcap_ver;
87 unsigned char type; /* record type */
88 /*
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.
92 */
93 bool should_free;
94 };
95
96 struct audit_proctitle {
97 int len; /* length of the cmdline field. */
98 char *value; /* the cmdline field */
99 };
100
101 /* The per-task audit context. */
102 struct audit_context {
103 int dummy; /* must be the first element */
104 enum {
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 */
108 } context;
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 */
116 u64 prio;
117 int return_valid; /* return code is valid */
118 /*
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.
125 */
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 */
130 struct path pwd;
131 struct audit_aux_data *aux;
132 struct audit_aux_data *aux_pids;
133 struct sockaddr_storage *sockaddr;
134 size_t sockaddr_len;
135 /* Save things to print about task_struct */
136 pid_t ppid;
137 kuid_t uid, euid, suid, fsuid;
138 kgid_t gid, egid, sgid, fsgid;
139 unsigned long personality;
140 int arch;
141
142 pid_t target_pid;
143 kuid_t target_auid;
144 kuid_t target_uid;
145 unsigned int target_sessionid;
146 u32 target_sid;
147 char target_comm[TASK_COMM_LEN];
148
149 struct audit_tree_refs *trees, *first_trees;
150 struct list_head killed_trees;
151 int tree_count;
152
153 int type;
154 union {
155 struct {
156 int nargs;
157 long args[6];
158 } socketcall;
159 struct {
160 kuid_t uid;
161 kgid_t gid;
162 umode_t mode;
163 u32 osid;
164 int has_perm;
165 uid_t perm_uid;
166 gid_t perm_gid;
167 umode_t perm_mode;
168 unsigned long qbytes;
169 } ipc;
170 struct {
171 mqd_t mqdes;
172 struct mq_attr mqstat;
173 } mq_getsetattr;
174 struct {
175 mqd_t mqdes;
176 int sigev_signo;
177 } mq_notify;
178 struct {
179 mqd_t mqdes;
180 size_t msg_len;
181 unsigned int msg_prio;
182 struct timespec64 abs_timeout;
183 } mq_sendrecv;
184 struct {
185 int oflag;
186 umode_t mode;
187 struct mq_attr attr;
188 } mq_open;
189 struct {
190 pid_t pid;
191 struct audit_cap_data cap;
192 } capset;
193 struct {
194 int fd;
195 int flags;
196 } mmap;
197 struct open_how openat2;
198 struct {
199 int argc;
200 } execve;
201 struct {
202 char *name;
203 } module;
204 struct {
205 struct audit_ntp_data ntp_data;
206 struct timespec64 tk_injoffset;
207 } time;
208 };
209 int fds[2];
210 struct audit_proctitle proctitle;
211 };
212
213 extern bool audit_ever_enabled;
214
215 extern void audit_log_session_info(struct audit_buffer *ab);
216
217 extern int auditd_test_task(struct task_struct *task);
218
219 #define AUDIT_INODE_BUCKETS 32
220 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
221
audit_hash_ino(u32 ino)222 static inline int audit_hash_ino(u32 ino)
223 {
224 return (ino & (AUDIT_INODE_BUCKETS-1));
225 }
226
227 /* Indicates that audit should log the full pathname. */
228 #define AUDIT_NAME_FULL -1
229
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);
239
240 struct audit_netlink_list {
241 __u32 portid;
242 struct net *net;
243 struct sk_buff_head q;
244 };
245
246 int audit_send_list_thread(void *_dest);
247
248 extern struct mutex audit_filter_mutex;
249 extern int audit_del_rule(struct audit_entry *entry);
250 extern void audit_free_rule_rcu(struct rcu_head *head);
251 extern struct list_head audit_filter_list[];
252
253 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
254
255 extern void audit_log_d_path_exe(struct audit_buffer *ab,
256 struct mm_struct *mm);
257
258 extern struct tty_struct *audit_get_tty(void);
259 extern void audit_put_tty(struct tty_struct *tty);
260
261 /* audit watch/mark/tree functions */
262 #ifdef CONFIG_AUDITSYSCALL
263 extern unsigned int audit_serial(void);
264 extern int auditsc_get_stamp(struct audit_context *ctx,
265 struct timespec64 *t, unsigned int *serial);
266
267 extern void audit_put_watch(struct audit_watch *watch);
268 extern void audit_get_watch(struct audit_watch *watch);
269 extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
270 u32 op);
271 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
272 extern void audit_remove_watch_rule(struct audit_krule *krule);
273 extern char *audit_watch_path(struct audit_watch *watch);
274 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
275 dev_t dev);
276
277 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
278 char *pathname, int len);
279 extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
280 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
281 extern void audit_remove_mark_rule(struct audit_krule *krule);
282 extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
283 unsigned long ino, dev_t dev);
284 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
285 extern int audit_exe_compare(struct task_struct *tsk,
286 struct audit_fsnotify_mark *mark);
287
288 extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
289 extern void audit_put_chunk(struct audit_chunk *chunk);
290 extern bool audit_tree_match(struct audit_chunk *chunk,
291 struct audit_tree *tree);
292 extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
293 extern int audit_add_tree_rule(struct audit_krule *rule);
294 extern int audit_remove_tree_rule(struct audit_krule *rule);
295 extern void audit_trim_trees(void);
296 extern int audit_tag_tree(char *old, char *new);
297 extern const char *audit_tree_path(struct audit_tree *tree);
298 extern void audit_put_tree(struct audit_tree *tree);
299 extern void audit_kill_trees(struct audit_context *context);
300
301 extern int audit_signal_info_syscall(struct task_struct *t);
302 extern void audit_filter_inodes(struct task_struct *tsk,
303 struct audit_context *ctx);
304 extern struct list_head *audit_killed_trees(void);
305 #else /* CONFIG_AUDITSYSCALL */
306 #define auditsc_get_stamp(c, t, s) 0
307 #define audit_put_watch(w) do { } while (0)
308 #define audit_get_watch(w) do { } while (0)
309 #define audit_to_watch(k, p, l, o) (-EINVAL)
310 #define audit_add_watch(k, l) (-EINVAL)
311 #define audit_remove_watch_rule(k) BUG()
312 #define audit_watch_path(w) ""
313 #define audit_watch_compare(w, i, d) 0
314
315 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
316 #define audit_mark_path(m) ""
317 #define audit_remove_mark(m) do { } while (0)
318 #define audit_remove_mark_rule(k) do { } while (0)
319 #define audit_mark_compare(m, i, d) 0
320 #define audit_exe_compare(t, m) (-EINVAL)
321 #define audit_dupe_exe(n, o) (-EINVAL)
322
323 #define audit_remove_tree_rule(rule) BUG()
324 #define audit_add_tree_rule(rule) -EINVAL
325 #define audit_make_tree(rule, str, op) -EINVAL
326 #define audit_trim_trees() do { } while (0)
327 #define audit_put_tree(tree) do { } while (0)
328 #define audit_tag_tree(old, new) -EINVAL
329 #define audit_tree_path(rule) "" /* never called */
330 #define audit_kill_trees(context) BUG()
331
audit_signal_info_syscall(struct task_struct * t)332 static inline int audit_signal_info_syscall(struct task_struct *t)
333 {
334 return 0;
335 }
336
337 #define audit_filter_inodes(t, c) AUDIT_STATE_DISABLED
338 #endif /* CONFIG_AUDITSYSCALL */
339
340 extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
341
342 extern int audit_filter(int msgtype, unsigned int listtype);
343
344 extern void audit_ctl_lock(void);
345 extern void audit_ctl_unlock(void);
346
347 #endif
348
