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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* audit.h -- Auditing support
3 *
4 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
5 * All Rights Reserved.
6 *
7 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
8 */
9#ifndef _LINUX_AUDIT_H_
10#define _LINUX_AUDIT_H_
11
12#include <linux/sched.h>
13#include <linux/ptrace.h>
14#include <uapi/linux/audit.h>
15#include <uapi/linux/netfilter/nf_tables.h>
16
17#define AUDIT_INO_UNSET ((unsigned long)-1)
18#define AUDIT_DEV_UNSET ((dev_t)-1)
19
20struct audit_sig_info {
21 uid_t uid;
22 pid_t pid;
23 char ctx[];
24};
25
26struct audit_buffer;
27struct audit_context;
28struct inode;
29struct netlink_skb_parms;
30struct path;
31struct linux_binprm;
32struct mq_attr;
33struct mqstat;
34struct audit_watch;
35struct audit_tree;
36struct sk_buff;
37
38struct audit_krule {
39 u32 pflags;
40 u32 flags;
41 u32 listnr;
42 u32 action;
43 u32 mask[AUDIT_BITMASK_SIZE];
44 u32 buflen; /* for data alloc on list rules */
45 u32 field_count;
46 char *filterkey; /* ties events to rules */
47 struct audit_field *fields;
48 struct audit_field *arch_f; /* quick access to arch field */
49 struct audit_field *inode_f; /* quick access to an inode field */
50 struct audit_watch *watch; /* associated watch */
51 struct audit_tree *tree; /* associated watched tree */
52 struct audit_fsnotify_mark *exe;
53 struct list_head rlist; /* entry in audit_{watch,tree}.rules list */
54 struct list_head list; /* for AUDIT_LIST* purposes only */
55 u64 prio;
56};
57
58/* Flag to indicate legacy AUDIT_LOGINUID unset usage */
59#define AUDIT_LOGINUID_LEGACY 0x1
60
61struct audit_field {
62 u32 type;
63 union {
64 u32 val;
65 kuid_t uid;
66 kgid_t gid;
67 struct {
68 char *lsm_str;
69 void *lsm_rule;
70 };
71 };
72 u32 op;
73};
74
75enum audit_ntp_type {
76 AUDIT_NTP_OFFSET,
77 AUDIT_NTP_FREQ,
78 AUDIT_NTP_STATUS,
79 AUDIT_NTP_TAI,
80 AUDIT_NTP_TICK,
81 AUDIT_NTP_ADJUST,
82
83 AUDIT_NTP_NVALS /* count */
84};
85
86#ifdef CONFIG_AUDITSYSCALL
87struct audit_ntp_val {
88 long long oldval, newval;
89};
90
91struct audit_ntp_data {
92 struct audit_ntp_val vals[AUDIT_NTP_NVALS];
93};
94#else
95struct audit_ntp_data {};
96#endif
97
98enum audit_nfcfgop {
99 AUDIT_XT_OP_REGISTER,
100 AUDIT_XT_OP_REPLACE,
101 AUDIT_XT_OP_UNREGISTER,
102 AUDIT_NFT_OP_TABLE_REGISTER,
103 AUDIT_NFT_OP_TABLE_UNREGISTER,
104 AUDIT_NFT_OP_CHAIN_REGISTER,
105 AUDIT_NFT_OP_CHAIN_UNREGISTER,
106 AUDIT_NFT_OP_RULE_REGISTER,
107 AUDIT_NFT_OP_RULE_UNREGISTER,
108 AUDIT_NFT_OP_SET_REGISTER,
109 AUDIT_NFT_OP_SET_UNREGISTER,
110 AUDIT_NFT_OP_SETELEM_REGISTER,
111 AUDIT_NFT_OP_SETELEM_UNREGISTER,
112 AUDIT_NFT_OP_GEN_REGISTER,
113 AUDIT_NFT_OP_OBJ_REGISTER,
114 AUDIT_NFT_OP_OBJ_UNREGISTER,
115 AUDIT_NFT_OP_OBJ_RESET,
116 AUDIT_NFT_OP_FLOWTABLE_REGISTER,
117 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
118 AUDIT_NFT_OP_INVALID,
119};
120
121extern int is_audit_feature_set(int which);
122
123extern int __init audit_register_class(int class, unsigned *list);
124extern int audit_classify_syscall(int abi, unsigned syscall);
125extern int audit_classify_arch(int arch);
126/* only for compat system calls */
127extern unsigned compat_write_class[];
128extern unsigned compat_read_class[];
129extern unsigned compat_dir_class[];
130extern unsigned compat_chattr_class[];
131extern unsigned compat_signal_class[];
132
133extern int audit_classify_compat_syscall(int abi, unsigned syscall);
134
135/* audit_names->type values */
136#define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */
137#define AUDIT_TYPE_NORMAL 1 /* a "normal" audit record */
138#define AUDIT_TYPE_PARENT 2 /* a parent audit record */
139#define AUDIT_TYPE_CHILD_DELETE 3 /* a child being deleted */
140#define AUDIT_TYPE_CHILD_CREATE 4 /* a child being created */
141
142/* maximized args number that audit_socketcall can process */
143#define AUDITSC_ARGS 6
144
145/* bit values for ->signal->audit_tty */
146#define AUDIT_TTY_ENABLE BIT(0)
147#define AUDIT_TTY_LOG_PASSWD BIT(1)
148
149struct filename;
150
151#define AUDIT_OFF 0
152#define AUDIT_ON 1
153#define AUDIT_LOCKED 2
154#ifdef CONFIG_AUDIT
155/* These are defined in audit.c */
156 /* Public API */
157extern __printf(4, 5)
158void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
159 const char *fmt, ...);
160
161extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
162extern __printf(2, 3)
163void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
164extern void audit_log_end(struct audit_buffer *ab);
165extern bool audit_string_contains_control(const char *string,
166 size_t len);
167extern void audit_log_n_hex(struct audit_buffer *ab,
168 const unsigned char *buf,
169 size_t len);
170extern void audit_log_n_string(struct audit_buffer *ab,
171 const char *buf,
172 size_t n);
173extern void audit_log_n_untrustedstring(struct audit_buffer *ab,
174 const char *string,
175 size_t n);
176extern void audit_log_untrustedstring(struct audit_buffer *ab,
177 const char *string);
178extern void audit_log_d_path(struct audit_buffer *ab,
179 const char *prefix,
180 const struct path *path);
181extern void audit_log_key(struct audit_buffer *ab,
182 char *key);
183extern void audit_log_path_denied(int type,
184 const char *operation);
185extern void audit_log_lost(const char *message);
186
187extern int audit_log_task_context(struct audit_buffer *ab);
188extern void audit_log_task_info(struct audit_buffer *ab);
189
190extern int audit_update_lsm_rules(void);
191
192 /* Private API (for audit.c only) */
193extern int audit_rule_change(int type, int seq, void *data, size_t datasz);
194extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
195
196extern int audit_set_loginuid(kuid_t loginuid);
197
198static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
199{
200 return tsk->loginuid;
201}
202
203static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
204{
205 return tsk->sessionid;
206}
207
208extern u32 audit_enabled;
209
210extern int audit_signal_info(int sig, struct task_struct *t);
211
212#else /* CONFIG_AUDIT */
213static inline __printf(4, 5)
214void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
215 const char *fmt, ...)
216{ }
217static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
218 gfp_t gfp_mask, int type)
219{
220 return NULL;
221}
222static inline __printf(2, 3)
223void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
224{ }
225static inline void audit_log_end(struct audit_buffer *ab)
226{ }
227static inline void audit_log_n_hex(struct audit_buffer *ab,
228 const unsigned char *buf, size_t len)
229{ }
230static inline void audit_log_n_string(struct audit_buffer *ab,
231 const char *buf, size_t n)
232{ }
233static inline void audit_log_n_untrustedstring(struct audit_buffer *ab,
234 const char *string, size_t n)
235{ }
236static inline void audit_log_untrustedstring(struct audit_buffer *ab,
237 const char *string)
238{ }
239static inline void audit_log_d_path(struct audit_buffer *ab,
240 const char *prefix,
241 const struct path *path)
242{ }
243static inline void audit_log_key(struct audit_buffer *ab, char *key)
244{ }
245static inline void audit_log_path_denied(int type, const char *operation)
246{ }
247static inline int audit_log_task_context(struct audit_buffer *ab)
248{
249 return 0;
250}
251static inline void audit_log_task_info(struct audit_buffer *ab)
252{ }
253
254static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
255{
256 return INVALID_UID;
257}
258
259static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
260{
261 return AUDIT_SID_UNSET;
262}
263
264#define audit_enabled AUDIT_OFF
265
266static inline int audit_signal_info(int sig, struct task_struct *t)
267{
268 return 0;
269}
270
271#endif /* CONFIG_AUDIT */
272
273#ifdef CONFIG_AUDIT_COMPAT_GENERIC
274#define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT))
275#else
276#define audit_is_compat(arch) false
277#endif
278
279#define AUDIT_INODE_PARENT 1 /* dentry represents the parent */
280#define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */
281#define AUDIT_INODE_NOEVAL 4 /* audit record incomplete */
282
283#ifdef CONFIG_AUDITSYSCALL
284#include <asm/syscall.h> /* for syscall_get_arch() */
285
286/* These are defined in auditsc.c */
287 /* Public API */
288extern int audit_alloc(struct task_struct *task);
289extern void __audit_free(struct task_struct *task);
290extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
291 unsigned long a2, unsigned long a3);
292extern void __audit_syscall_exit(int ret_success, long ret_value);
293extern struct filename *__audit_reusename(const __user char *uptr);
294extern void __audit_getname(struct filename *name);
295extern void __audit_getcwd(void);
296extern void __audit_inode(struct filename *name, const struct dentry *dentry,
297 unsigned int flags);
298extern void __audit_file(const struct file *);
299extern void __audit_inode_child(struct inode *parent,
300 const struct dentry *dentry,
301 const unsigned char type);
302extern void audit_seccomp(unsigned long syscall, long signr, int code);
303extern void audit_seccomp_actions_logged(const char *names,
304 const char *old_names, int res);
305extern void __audit_ptrace(struct task_struct *t);
306
307static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx)
308{
309 task->audit_context = ctx;
310}
311
312static inline struct audit_context *audit_context(void)
313{
314 return current->audit_context;
315}
316
317static inline bool audit_dummy_context(void)
318{
319 void *p = audit_context();
320 return !p || *(int *)p;
321}
322static inline void audit_free(struct task_struct *task)
323{
324 if (unlikely(task->audit_context))
325 __audit_free(task);
326}
327static inline void audit_syscall_entry(int major, unsigned long a0,
328 unsigned long a1, unsigned long a2,
329 unsigned long a3)
330{
331 if (unlikely(audit_context()))
332 __audit_syscall_entry(major, a0, a1, a2, a3);
333}
334static inline void audit_syscall_exit(void *pt_regs)
335{
336 if (unlikely(audit_context())) {
337 int success = is_syscall_success(pt_regs);
338 long return_code = regs_return_value(pt_regs);
339
340 __audit_syscall_exit(success, return_code);
341 }
342}
343static inline struct filename *audit_reusename(const __user char *name)
344{
345 if (unlikely(!audit_dummy_context()))
346 return __audit_reusename(name);
347 return NULL;
348}
349static inline void audit_getname(struct filename *name)
350{
351 if (unlikely(!audit_dummy_context()))
352 __audit_getname(name);
353}
354static inline void audit_getcwd(void)
355{
356 if (unlikely(audit_context()))
357 __audit_getcwd();
358}
359static inline void audit_inode(struct filename *name,
360 const struct dentry *dentry,
361 unsigned int aflags) {
362 if (unlikely(!audit_dummy_context()))
363 __audit_inode(name, dentry, aflags);
364}
365static inline void audit_file(struct file *file)
366{
367 if (unlikely(!audit_dummy_context()))
368 __audit_file(file);
369}
370static inline void audit_inode_parent_hidden(struct filename *name,
371 const struct dentry *dentry)
372{
373 if (unlikely(!audit_dummy_context()))
374 __audit_inode(name, dentry,
375 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
376}
377static inline void audit_inode_child(struct inode *parent,
378 const struct dentry *dentry,
379 const unsigned char type) {
380 if (unlikely(!audit_dummy_context()))
381 __audit_inode_child(parent, dentry, type);
382}
383void audit_core_dumps(long signr);
384
385static inline void audit_ptrace(struct task_struct *t)
386{
387 if (unlikely(!audit_dummy_context()))
388 __audit_ptrace(t);
389}
390
391 /* Private API (for audit.c only) */
392extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
393extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
394extern void __audit_bprm(struct linux_binprm *bprm);
395extern int __audit_socketcall(int nargs, unsigned long *args);
396extern int __audit_sockaddr(int len, void *addr);
397extern void __audit_fd_pair(int fd1, int fd2);
398extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
399extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout);
400extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
401extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
402extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
403 const struct cred *new,
404 const struct cred *old);
405extern void __audit_log_capset(const struct cred *new, const struct cred *old);
406extern void __audit_mmap_fd(int fd, int flags);
407extern void __audit_log_kern_module(char *name);
408extern void __audit_fanotify(unsigned int response);
409extern void __audit_tk_injoffset(struct timespec64 offset);
410extern void __audit_ntp_log(const struct audit_ntp_data *ad);
411extern void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries,
412 enum audit_nfcfgop op, gfp_t gfp);
413
414static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
415{
416 if (unlikely(!audit_dummy_context()))
417 __audit_ipc_obj(ipcp);
418}
419static inline void audit_fd_pair(int fd1, int fd2)
420{
421 if (unlikely(!audit_dummy_context()))
422 __audit_fd_pair(fd1, fd2);
423}
424static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
425{
426 if (unlikely(!audit_dummy_context()))
427 __audit_ipc_set_perm(qbytes, uid, gid, mode);
428}
429static inline void audit_bprm(struct linux_binprm *bprm)
430{
431 if (unlikely(!audit_dummy_context()))
432 __audit_bprm(bprm);
433}
434static inline int audit_socketcall(int nargs, unsigned long *args)
435{
436 if (unlikely(!audit_dummy_context()))
437 return __audit_socketcall(nargs, args);
438 return 0;
439}
440
441static inline int audit_socketcall_compat(int nargs, u32 *args)
442{
443 unsigned long a[AUDITSC_ARGS];
444 int i;
445
446 if (audit_dummy_context())
447 return 0;
448
449 for (i = 0; i < nargs; i++)
450 a[i] = (unsigned long)args[i];
451 return __audit_socketcall(nargs, a);
452}
453
454static inline int audit_sockaddr(int len, void *addr)
455{
456 if (unlikely(!audit_dummy_context()))
457 return __audit_sockaddr(len, addr);
458 return 0;
459}
460static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
461{
462 if (unlikely(!audit_dummy_context()))
463 __audit_mq_open(oflag, mode, attr);
464}
465static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout)
466{
467 if (unlikely(!audit_dummy_context()))
468 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
469}
470static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
471{
472 if (unlikely(!audit_dummy_context()))
473 __audit_mq_notify(mqdes, notification);
474}
475static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
476{
477 if (unlikely(!audit_dummy_context()))
478 __audit_mq_getsetattr(mqdes, mqstat);
479}
480
481static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
482 const struct cred *new,
483 const struct cred *old)
484{
485 if (unlikely(!audit_dummy_context()))
486 return __audit_log_bprm_fcaps(bprm, new, old);
487 return 0;
488}
489
490static inline void audit_log_capset(const struct cred *new,
491 const struct cred *old)
492{
493 if (unlikely(!audit_dummy_context()))
494 __audit_log_capset(new, old);
495}
496
497static inline void audit_mmap_fd(int fd, int flags)
498{
499 if (unlikely(!audit_dummy_context()))
500 __audit_mmap_fd(fd, flags);
501}
502
503static inline void audit_log_kern_module(char *name)
504{
505 if (!audit_dummy_context())
506 __audit_log_kern_module(name);
507}
508
509static inline void audit_fanotify(unsigned int response)
510{
511 if (!audit_dummy_context())
512 __audit_fanotify(response);
513}
514
515static inline void audit_tk_injoffset(struct timespec64 offset)
516{
517 /* ignore no-op events */
518 if (offset.tv_sec == 0 && offset.tv_nsec == 0)
519 return;
520
521 if (!audit_dummy_context())
522 __audit_tk_injoffset(offset);
523}
524
525static inline void audit_ntp_init(struct audit_ntp_data *ad)
526{
527 memset(ad, 0, sizeof(*ad));
528}
529
530static inline void audit_ntp_set_old(struct audit_ntp_data *ad,
531 enum audit_ntp_type type, long long val)
532{
533 ad->vals[type].oldval = val;
534}
535
536static inline void audit_ntp_set_new(struct audit_ntp_data *ad,
537 enum audit_ntp_type type, long long val)
538{
539 ad->vals[type].newval = val;
540}
541
542static inline void audit_ntp_log(const struct audit_ntp_data *ad)
543{
544 if (!audit_dummy_context())
545 __audit_ntp_log(ad);
546}
547
548static inline void audit_log_nfcfg(const char *name, u8 af,
549 unsigned int nentries,
550 enum audit_nfcfgop op, gfp_t gfp)
551{
552 if (audit_enabled)
553 __audit_log_nfcfg(name, af, nentries, op, gfp);
554}
555
556extern int audit_n_rules;
557extern int audit_signals;
558#else /* CONFIG_AUDITSYSCALL */
559static inline int audit_alloc(struct task_struct *task)
560{
561 return 0;
562}
563static inline void audit_free(struct task_struct *task)
564{ }
565static inline void audit_syscall_entry(int major, unsigned long a0,
566 unsigned long a1, unsigned long a2,
567 unsigned long a3)
568{ }
569static inline void audit_syscall_exit(void *pt_regs)
570{ }
571static inline bool audit_dummy_context(void)
572{
573 return true;
574}
575static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx)
576{ }
577static inline struct audit_context *audit_context(void)
578{
579 return NULL;
580}
581static inline struct filename *audit_reusename(const __user char *name)
582{
583 return NULL;
584}
585static inline void audit_getname(struct filename *name)
586{ }
587static inline void audit_getcwd(void)
588{ }
589static inline void audit_inode(struct filename *name,
590 const struct dentry *dentry,
591 unsigned int aflags)
592{ }
593static inline void audit_file(struct file *file)
594{
595}
596static inline void audit_inode_parent_hidden(struct filename *name,
597 const struct dentry *dentry)
598{ }
599static inline void audit_inode_child(struct inode *parent,
600 const struct dentry *dentry,
601 const unsigned char type)
602{ }
603static inline void audit_core_dumps(long signr)
604{ }
605static inline void audit_seccomp(unsigned long syscall, long signr, int code)
606{ }
607static inline void audit_seccomp_actions_logged(const char *names,
608 const char *old_names, int res)
609{ }
610static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
611{ }
612static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
613 gid_t gid, umode_t mode)
614{ }
615static inline void audit_bprm(struct linux_binprm *bprm)
616{ }
617static inline int audit_socketcall(int nargs, unsigned long *args)
618{
619 return 0;
620}
621
622static inline int audit_socketcall_compat(int nargs, u32 *args)
623{
624 return 0;
625}
626
627static inline void audit_fd_pair(int fd1, int fd2)
628{ }
629static inline int audit_sockaddr(int len, void *addr)
630{
631 return 0;
632}
633static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
634{ }
635static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
636 unsigned int msg_prio,
637 const struct timespec64 *abs_timeout)
638{ }
639static inline void audit_mq_notify(mqd_t mqdes,
640 const struct sigevent *notification)
641{ }
642static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
643{ }
644static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
645 const struct cred *new,
646 const struct cred *old)
647{
648 return 0;
649}
650static inline void audit_log_capset(const struct cred *new,
651 const struct cred *old)
652{ }
653static inline void audit_mmap_fd(int fd, int flags)
654{ }
655
656static inline void audit_log_kern_module(char *name)
657{
658}
659
660static inline void audit_fanotify(unsigned int response)
661{ }
662
663static inline void audit_tk_injoffset(struct timespec64 offset)
664{ }
665
666static inline void audit_ntp_init(struct audit_ntp_data *ad)
667{ }
668
669static inline void audit_ntp_set_old(struct audit_ntp_data *ad,
670 enum audit_ntp_type type, long long val)
671{ }
672
673static inline void audit_ntp_set_new(struct audit_ntp_data *ad,
674 enum audit_ntp_type type, long long val)
675{ }
676
677static inline void audit_ntp_log(const struct audit_ntp_data *ad)
678{ }
679
680static inline void audit_ptrace(struct task_struct *t)
681{ }
682
683static inline void audit_log_nfcfg(const char *name, u8 af,
684 unsigned int nentries,
685 enum audit_nfcfgop op, gfp_t gfp)
686{ }
687
688#define audit_n_rules 0
689#define audit_signals 0
690#endif /* CONFIG_AUDITSYSCALL */
691
692static inline bool audit_loginuid_set(struct task_struct *tsk)
693{
694 return uid_valid(audit_get_loginuid(tsk));
695}
696
697#endif