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