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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/security.h>
15#include <linux/skbuff.h>
16#include <uapi/linux/mqueue.h>
17#include <linux/tty.h>
18#include <uapi/linux/openat2.h> // struct open_how
19
20/* AUDIT_NAMES is the number of slots we reserve in the audit_context
21 * for saving names from getname(). If we get more names we will allocate
22 * a name dynamically and also add those to the list anchored by names_list. */
23#define AUDIT_NAMES 5
24
25/* At task start time, the audit_state is set in the audit_context using
26 a per-task filter. At syscall entry, the audit_state is augmented by
27 the syscall filter. */
28enum audit_state {
29 AUDIT_STATE_DISABLED, /* Do not create per-task audit_context.
30 * No syscall-specific audit records can
31 * be generated. */
32 AUDIT_STATE_BUILD, /* Create the per-task audit_context,
33 * and fill it in at syscall
34 * entry time. This makes a full
35 * syscall record available if some
36 * other part of the kernel decides it
37 * should be recorded. */
38 AUDIT_STATE_RECORD /* Create the per-task audit_context,
39 * always fill it in at syscall entry
40 * time, and always write out the audit
41 * record at syscall exit time. */
42};
43
44/* Rule lists */
45struct audit_watch;
46struct audit_fsnotify_mark;
47struct audit_tree;
48struct audit_chunk;
49
50struct audit_entry {
51 struct list_head list;
52 struct rcu_head rcu;
53 struct audit_krule rule;
54};
55
56struct audit_cap_data {
57 kernel_cap_t permitted;
58 kernel_cap_t inheritable;
59 union {
60 unsigned int fE; /* effective bit of file cap */
61 kernel_cap_t effective; /* effective set of process */
62 };
63 kernel_cap_t ambient;
64 kuid_t rootid;
65};
66
67/* When fs/namei.c:getname() is called, we store the pointer in name and bump
68 * the refcnt in the associated filename struct.
69 *
70 * Further, in fs/namei.c:path_lookup() we store the inode and device.
71 */
72struct audit_names {
73 struct list_head list; /* audit_context->names_list */
74
75 struct filename *name;
76 int name_len; /* number of chars to log */
77 bool hidden; /* don't log this record */
78
79 u64 ino;
80 dev_t dev;
81 umode_t mode;
82 kuid_t uid;
83 kgid_t gid;
84 dev_t rdev;
85 struct lsm_prop oprop;
86 struct audit_cap_data fcap;
87 unsigned int fcap_ver;
88 unsigned char type; /* record type */
89 /*
90 * This was an allocated audit_names and not from the array of
91 * names allocated in the task audit context. Thus this name
92 * should be freed on syscall exit.
93 */
94 bool should_free;
95};
96
97struct audit_proctitle {
98 int len; /* length of the cmdline field. */
99 char *value; /* the cmdline field */
100};
101
102/* A timestamp/serial pair to identify an event */
103struct audit_stamp {
104 struct timespec64 ctime; /* time of syscall entry */
105 unsigned int serial; /* serial number for record */
106};
107
108/* The per-task audit context. */
109struct audit_context {
110 int dummy; /* must be the first element */
111 enum {
112 AUDIT_CTX_UNUSED, /* audit_context is currently unused */
113 AUDIT_CTX_SYSCALL, /* in use by syscall */
114 AUDIT_CTX_URING, /* in use by io_uring */
115 } context;
116 enum audit_state state, current_state;
117 struct audit_stamp stamp; /* event identifier */
118 int major; /* syscall number */
119 int uring_op; /* uring operation */
120 unsigned long argv[4]; /* syscall arguments */
121 long return_code;/* syscall return code */
122 u64 prio;
123 int return_valid; /* return code is valid */
124 /*
125 * The names_list is the list of all audit_names collected during this
126 * syscall. The first AUDIT_NAMES entries in the names_list will
127 * actually be from the preallocated_names array for performance
128 * reasons. Except during allocation they should never be referenced
129 * through the preallocated_names array and should only be found/used
130 * by running the names_list.
131 */
132 struct audit_names preallocated_names[AUDIT_NAMES];
133 int name_count; /* total records in names_list */
134 struct list_head names_list; /* struct audit_names->list anchor */
135 char *filterkey; /* key for rule that triggered record */
136 struct path pwd;
137 struct audit_aux_data *aux;
138 struct audit_aux_data *aux_pids;
139 struct sockaddr_storage *sockaddr;
140 size_t sockaddr_len;
141 /* Save things to print about task_struct */
142 pid_t ppid;
143 kuid_t uid, euid, suid, fsuid;
144 kgid_t gid, egid, sgid, fsgid;
145 unsigned long personality;
146 int arch;
147
148 pid_t target_pid;
149 kuid_t target_auid;
150 kuid_t target_uid;
151 unsigned int target_sessionid;
152 struct lsm_prop target_ref;
153 char target_comm[TASK_COMM_LEN];
154
155 struct audit_tree_refs *trees, *first_trees;
156 struct list_head killed_trees;
157 int tree_count;
158
159 int type;
160 union {
161 struct {
162 int nargs;
163 long args[6];
164 } socketcall;
165 struct {
166 kuid_t uid;
167 kgid_t gid;
168 umode_t mode;
169 struct lsm_prop oprop;
170 int has_perm;
171 uid_t perm_uid;
172 gid_t perm_gid;
173 umode_t perm_mode;
174 unsigned long qbytes;
175 } ipc;
176 struct {
177 mqd_t mqdes;
178 struct mq_attr mqstat;
179 } mq_getsetattr;
180 struct {
181 mqd_t mqdes;
182 int sigev_signo;
183 } mq_notify;
184 struct {
185 mqd_t mqdes;
186 size_t msg_len;
187 unsigned int msg_prio;
188 struct timespec64 abs_timeout;
189 } mq_sendrecv;
190 struct {
191 int oflag;
192 umode_t mode;
193 struct mq_attr attr;
194 } mq_open;
195 struct {
196 pid_t pid;
197 struct audit_cap_data cap;
198 } capset;
199 struct {
200 int fd;
201 int flags;
202 } mmap;
203 struct open_how openat2;
204 struct {
205 int argc;
206 } execve;
207 struct {
208 const char *name;
209 } module;
210 struct {
211 struct audit_ntp_data ntp_data;
212 struct timespec64 tk_injoffset;
213 } time;
214 };
215 int fds[2];
216 struct audit_proctitle proctitle;
217};
218
219extern bool audit_ever_enabled;
220
221extern void audit_log_session_info(struct audit_buffer *ab);
222
223extern int auditd_test_task(struct task_struct *task);
224
225#define AUDIT_INODE_BUCKETS 32
226extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
227
228static inline int audit_hash_ino(u64 ino)
229{
230 return ((u32)ino & (AUDIT_INODE_BUCKETS-1));
231}
232
233/* Indicates that audit should log the full pathname. */
234#define AUDIT_NAME_FULL -1
235
236extern int audit_match_class(int class, unsigned int syscall);
237extern int audit_comparator(const u32 left, const u32 op, const u32 right);
238extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
239extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
240extern int parent_len(const char *path);
241extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen);
242extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
243 const void *payload, int size);
244extern void audit_panic(const char *message);
245
246struct audit_netlink_list {
247 __u32 portid;
248 struct net *net;
249 struct sk_buff_head q;
250};
251
252int audit_send_list_thread(void *_dest);
253
254extern struct mutex audit_filter_mutex;
255extern int audit_del_rule(struct audit_entry *entry);
256extern void audit_free_rule_rcu(struct rcu_head *head);
257extern struct list_head audit_filter_list[];
258
259struct audit_watch_ctx {
260 struct inode *dir;
261 struct inode *child;
262};
263
264extern struct audit_entry *audit_dupe_rule(struct audit_krule *old,
265 struct audit_watch_ctx *ctx);
266extern void audit_log_d_path_exe(struct audit_buffer *ab,
267 struct mm_struct *mm);
268
269extern struct tty_struct *audit_get_tty(void);
270extern void audit_put_tty(struct tty_struct *tty);
271
272/* audit watch/mark/tree functions */
273extern unsigned int audit_serial(void);
274#ifdef CONFIG_AUDITSYSCALL
275extern int auditsc_get_stamp(struct audit_context *ctx,
276 struct audit_stamp *stamp);
277
278extern void audit_put_watch(struct audit_watch *watch);
279extern void audit_get_watch(struct audit_watch *watch);
280extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
281 u32 op);
282extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
283extern void audit_remove_watch_rule(struct audit_krule *krule);
284extern char *audit_watch_path(struct audit_watch *watch);
285extern int audit_watch_compare(struct audit_watch *watch, u64 ino, dev_t dev);
286
287extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
288 char *pathname, int len,
289 struct audit_watch_ctx *ctx);
290extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
291extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
292extern void audit_remove_mark_rule(struct audit_krule *krule);
293extern int audit_mark_compare(struct audit_fsnotify_mark *mark, u64 ino,
294 dev_t dev);
295extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old,
296 struct audit_watch_ctx *ctx);
297extern int audit_exe_compare(struct task_struct *tsk,
298 struct audit_fsnotify_mark *mark);
299
300extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
301extern void audit_put_chunk(struct audit_chunk *chunk);
302extern bool audit_tree_match(struct audit_chunk *chunk,
303 struct audit_tree *tree);
304extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
305extern int audit_add_tree_rule(struct audit_krule *rule);
306extern int audit_remove_tree_rule(struct audit_krule *rule);
307extern void audit_trim_trees(void);
308extern int audit_tag_tree(char *old, char *new);
309extern const char *audit_tree_path(struct audit_tree *tree);
310extern void audit_put_tree(struct audit_tree *tree);
311extern void audit_kill_trees(struct audit_context *context);
312
313extern int audit_signal_info_syscall(struct task_struct *t);
314extern void audit_filter_inodes(struct task_struct *tsk,
315 struct audit_context *ctx);
316extern struct list_head *audit_killed_trees(void);
317#else /* CONFIG_AUDITSYSCALL */
318#define auditsc_get_stamp(c, s) 0
319#define audit_put_watch(w) do { } while (0)
320#define audit_get_watch(w) do { } while (0)
321#define audit_to_watch(k, p, l, o) (-EINVAL)
322#define audit_add_watch(k, l) (-EINVAL)
323#define audit_remove_watch_rule(k) BUG()
324#define audit_watch_path(w) ""
325#define audit_watch_compare(w, i, d) 0
326
327#define audit_alloc_mark(k, p, l, c) (ERR_PTR(-EINVAL))
328#define audit_mark_path(m) ""
329#define audit_remove_mark(m) do { } while (0)
330#define audit_remove_mark_rule(k) do { } while (0)
331#define audit_mark_compare(m, i, d) 0
332#define audit_exe_compare(t, m) (-EINVAL)
333#define audit_dupe_exe(n, o, c) (-EINVAL)
334
335#define audit_remove_tree_rule(rule) BUG()
336#define audit_add_tree_rule(rule) -EINVAL
337#define audit_make_tree(rule, str, op) -EINVAL
338#define audit_trim_trees() do { } while (0)
339#define audit_put_tree(tree) do { } while (0)
340#define audit_tag_tree(old, new) -EINVAL
341#define audit_tree_path(rule) "" /* never called */
342#define audit_kill_trees(context) BUG()
343
344static inline int audit_signal_info_syscall(struct task_struct *t)
345{
346 return 0;
347}
348
349#define audit_filter_inodes(t, c) do { } while (0)
350#endif /* CONFIG_AUDITSYSCALL */
351
352extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
353
354extern int audit_filter(int msgtype, unsigned int listtype);
355
356extern void audit_ctl_lock(void);
357extern void audit_ctl_unlock(void);
358
359#endif