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1/* audit.h -- Auditing support
2 *
3 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
4 * All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
21 *
22 */
23#ifndef _LINUX_AUDIT_H_
24#define _LINUX_AUDIT_H_
25
26#include <linux/sched.h>
27#include <linux/ptrace.h>
28#include <linux/namei.h> /* LOOKUP_* */
29#include <uapi/linux/audit.h>
30
31#define AUDIT_INO_UNSET ((unsigned long)-1)
32#define AUDIT_DEV_UNSET ((dev_t)-1)
33
34struct audit_sig_info {
35 uid_t uid;
36 pid_t pid;
37 char ctx[0];
38};
39
40struct audit_buffer;
41struct audit_context;
42struct inode;
43struct netlink_skb_parms;
44struct path;
45struct linux_binprm;
46struct mq_attr;
47struct mqstat;
48struct audit_watch;
49struct audit_tree;
50struct sk_buff;
51
52struct audit_krule {
53 u32 pflags;
54 u32 flags;
55 u32 listnr;
56 u32 action;
57 u32 mask[AUDIT_BITMASK_SIZE];
58 u32 buflen; /* for data alloc on list rules */
59 u32 field_count;
60 char *filterkey; /* ties events to rules */
61 struct audit_field *fields;
62 struct audit_field *arch_f; /* quick access to arch field */
63 struct audit_field *inode_f; /* quick access to an inode field */
64 struct audit_watch *watch; /* associated watch */
65 struct audit_tree *tree; /* associated watched tree */
66 struct audit_fsnotify_mark *exe;
67 struct list_head rlist; /* entry in audit_{watch,tree}.rules list */
68 struct list_head list; /* for AUDIT_LIST* purposes only */
69 u64 prio;
70};
71
72/* Flag to indicate legacy AUDIT_LOGINUID unset usage */
73#define AUDIT_LOGINUID_LEGACY 0x1
74
75struct audit_field {
76 u32 type;
77 union {
78 u32 val;
79 kuid_t uid;
80 kgid_t gid;
81 struct {
82 char *lsm_str;
83 void *lsm_rule;
84 };
85 };
86 u32 op;
87};
88
89extern int is_audit_feature_set(int which);
90
91extern int __init audit_register_class(int class, unsigned *list);
92extern int audit_classify_syscall(int abi, unsigned syscall);
93extern int audit_classify_arch(int arch);
94/* only for compat system calls */
95extern unsigned compat_write_class[];
96extern unsigned compat_read_class[];
97extern unsigned compat_dir_class[];
98extern unsigned compat_chattr_class[];
99extern unsigned compat_signal_class[];
100
101extern int audit_classify_compat_syscall(int abi, unsigned syscall);
102
103/* audit_names->type values */
104#define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */
105#define AUDIT_TYPE_NORMAL 1 /* a "normal" audit record */
106#define AUDIT_TYPE_PARENT 2 /* a parent audit record */
107#define AUDIT_TYPE_CHILD_DELETE 3 /* a child being deleted */
108#define AUDIT_TYPE_CHILD_CREATE 4 /* a child being created */
109
110/* maximized args number that audit_socketcall can process */
111#define AUDITSC_ARGS 6
112
113/* bit values for ->signal->audit_tty */
114#define AUDIT_TTY_ENABLE BIT(0)
115#define AUDIT_TTY_LOG_PASSWD BIT(1)
116
117struct filename;
118
119#define AUDIT_OFF 0
120#define AUDIT_ON 1
121#define AUDIT_LOCKED 2
122#ifdef CONFIG_AUDIT
123/* These are defined in audit.c */
124 /* Public API */
125extern __printf(4, 5)
126void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
127 const char *fmt, ...);
128
129extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
130extern __printf(2, 3)
131void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
132extern void audit_log_end(struct audit_buffer *ab);
133extern bool audit_string_contains_control(const char *string,
134 size_t len);
135extern void audit_log_n_hex(struct audit_buffer *ab,
136 const unsigned char *buf,
137 size_t len);
138extern void audit_log_n_string(struct audit_buffer *ab,
139 const char *buf,
140 size_t n);
141extern void audit_log_n_untrustedstring(struct audit_buffer *ab,
142 const char *string,
143 size_t n);
144extern void audit_log_untrustedstring(struct audit_buffer *ab,
145 const char *string);
146extern void audit_log_d_path(struct audit_buffer *ab,
147 const char *prefix,
148 const struct path *path);
149extern void audit_log_key(struct audit_buffer *ab,
150 char *key);
151extern void audit_log_link_denied(const char *operation);
152extern void audit_log_lost(const char *message);
153
154extern int audit_log_task_context(struct audit_buffer *ab);
155extern void audit_log_task_info(struct audit_buffer *ab);
156
157extern int audit_update_lsm_rules(void);
158
159 /* Private API (for audit.c only) */
160extern int audit_rule_change(int type, int seq, void *data, size_t datasz);
161extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
162
163extern int audit_set_loginuid(kuid_t loginuid);
164
165static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
166{
167 return tsk->loginuid;
168}
169
170static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
171{
172 return tsk->sessionid;
173}
174
175extern u32 audit_enabled;
176#else /* CONFIG_AUDIT */
177static inline __printf(4, 5)
178void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
179 const char *fmt, ...)
180{ }
181static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
182 gfp_t gfp_mask, int type)
183{
184 return NULL;
185}
186static inline __printf(2, 3)
187void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
188{ }
189static inline void audit_log_end(struct audit_buffer *ab)
190{ }
191static inline void audit_log_n_hex(struct audit_buffer *ab,
192 const unsigned char *buf, size_t len)
193{ }
194static inline void audit_log_n_string(struct audit_buffer *ab,
195 const char *buf, size_t n)
196{ }
197static inline void audit_log_n_untrustedstring(struct audit_buffer *ab,
198 const char *string, size_t n)
199{ }
200static inline void audit_log_untrustedstring(struct audit_buffer *ab,
201 const char *string)
202{ }
203static inline void audit_log_d_path(struct audit_buffer *ab,
204 const char *prefix,
205 const struct path *path)
206{ }
207static inline void audit_log_key(struct audit_buffer *ab, char *key)
208{ }
209static inline void audit_log_link_denied(const char *string)
210{ }
211static inline int audit_log_task_context(struct audit_buffer *ab)
212{
213 return 0;
214}
215static inline void audit_log_task_info(struct audit_buffer *ab)
216{ }
217
218static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
219{
220 return INVALID_UID;
221}
222
223static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
224{
225 return AUDIT_SID_UNSET;
226}
227
228#define audit_enabled AUDIT_OFF
229#endif /* CONFIG_AUDIT */
230
231#ifdef CONFIG_AUDIT_COMPAT_GENERIC
232#define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT))
233#else
234#define audit_is_compat(arch) false
235#endif
236
237#ifdef CONFIG_AUDITSYSCALL
238#include <asm/syscall.h> /* for syscall_get_arch() */
239
240/* These are defined in auditsc.c */
241 /* Public API */
242extern int audit_alloc(struct task_struct *task);
243extern void __audit_free(struct task_struct *task);
244extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
245 unsigned long a2, unsigned long a3);
246extern void __audit_syscall_exit(int ret_success, long ret_value);
247extern struct filename *__audit_reusename(const __user char *uptr);
248extern void __audit_getname(struct filename *name);
249
250#define AUDIT_INODE_PARENT 1 /* dentry represents the parent */
251#define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */
252#define AUDIT_INODE_NOEVAL 4 /* audit record incomplete */
253extern void __audit_inode(struct filename *name, const struct dentry *dentry,
254 unsigned int flags);
255extern void __audit_file(const struct file *);
256extern void __audit_inode_child(struct inode *parent,
257 const struct dentry *dentry,
258 const unsigned char type);
259extern void audit_seccomp(unsigned long syscall, long signr, int code);
260extern void audit_seccomp_actions_logged(const char *names,
261 const char *old_names, int res);
262extern void __audit_ptrace(struct task_struct *t);
263
264static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx)
265{
266 task->audit_context = ctx;
267}
268
269static inline struct audit_context *audit_context(void)
270{
271 return current->audit_context;
272}
273
274static inline bool audit_dummy_context(void)
275{
276 void *p = audit_context();
277 return !p || *(int *)p;
278}
279static inline void audit_free(struct task_struct *task)
280{
281 if (unlikely(task->audit_context))
282 __audit_free(task);
283}
284static inline void audit_syscall_entry(int major, unsigned long a0,
285 unsigned long a1, unsigned long a2,
286 unsigned long a3)
287{
288 if (unlikely(audit_context()))
289 __audit_syscall_entry(major, a0, a1, a2, a3);
290}
291static inline void audit_syscall_exit(void *pt_regs)
292{
293 if (unlikely(audit_context())) {
294 int success = is_syscall_success(pt_regs);
295 long return_code = regs_return_value(pt_regs);
296
297 __audit_syscall_exit(success, return_code);
298 }
299}
300static inline struct filename *audit_reusename(const __user char *name)
301{
302 if (unlikely(!audit_dummy_context()))
303 return __audit_reusename(name);
304 return NULL;
305}
306static inline void audit_getname(struct filename *name)
307{
308 if (unlikely(!audit_dummy_context()))
309 __audit_getname(name);
310}
311static inline void audit_inode(struct filename *name,
312 const struct dentry *dentry,
313 unsigned int flags) {
314 if (unlikely(!audit_dummy_context())) {
315 unsigned int aflags = 0;
316
317 if (flags & LOOKUP_PARENT)
318 aflags |= AUDIT_INODE_PARENT;
319 if (flags & LOOKUP_NO_EVAL)
320 aflags |= AUDIT_INODE_NOEVAL;
321 __audit_inode(name, dentry, aflags);
322 }
323}
324static inline void audit_file(struct file *file)
325{
326 if (unlikely(!audit_dummy_context()))
327 __audit_file(file);
328}
329static inline void audit_inode_parent_hidden(struct filename *name,
330 const struct dentry *dentry)
331{
332 if (unlikely(!audit_dummy_context()))
333 __audit_inode(name, dentry,
334 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
335}
336static inline void audit_inode_child(struct inode *parent,
337 const struct dentry *dentry,
338 const unsigned char type) {
339 if (unlikely(!audit_dummy_context()))
340 __audit_inode_child(parent, dentry, type);
341}
342void audit_core_dumps(long signr);
343
344static inline void audit_ptrace(struct task_struct *t)
345{
346 if (unlikely(!audit_dummy_context()))
347 __audit_ptrace(t);
348}
349
350 /* Private API (for audit.c only) */
351extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
352extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
353extern void __audit_bprm(struct linux_binprm *bprm);
354extern int __audit_socketcall(int nargs, unsigned long *args);
355extern int __audit_sockaddr(int len, void *addr);
356extern void __audit_fd_pair(int fd1, int fd2);
357extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
358extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout);
359extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
360extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
361extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
362 const struct cred *new,
363 const struct cred *old);
364extern void __audit_log_capset(const struct cred *new, const struct cred *old);
365extern void __audit_mmap_fd(int fd, int flags);
366extern void __audit_log_kern_module(char *name);
367extern void __audit_fanotify(unsigned int response);
368
369static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
370{
371 if (unlikely(!audit_dummy_context()))
372 __audit_ipc_obj(ipcp);
373}
374static inline void audit_fd_pair(int fd1, int fd2)
375{
376 if (unlikely(!audit_dummy_context()))
377 __audit_fd_pair(fd1, fd2);
378}
379static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
380{
381 if (unlikely(!audit_dummy_context()))
382 __audit_ipc_set_perm(qbytes, uid, gid, mode);
383}
384static inline void audit_bprm(struct linux_binprm *bprm)
385{
386 if (unlikely(!audit_dummy_context()))
387 __audit_bprm(bprm);
388}
389static inline int audit_socketcall(int nargs, unsigned long *args)
390{
391 if (unlikely(!audit_dummy_context()))
392 return __audit_socketcall(nargs, args);
393 return 0;
394}
395
396static inline int audit_socketcall_compat(int nargs, u32 *args)
397{
398 unsigned long a[AUDITSC_ARGS];
399 int i;
400
401 if (audit_dummy_context())
402 return 0;
403
404 for (i = 0; i < nargs; i++)
405 a[i] = (unsigned long)args[i];
406 return __audit_socketcall(nargs, a);
407}
408
409static inline int audit_sockaddr(int len, void *addr)
410{
411 if (unlikely(!audit_dummy_context()))
412 return __audit_sockaddr(len, addr);
413 return 0;
414}
415static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
416{
417 if (unlikely(!audit_dummy_context()))
418 __audit_mq_open(oflag, mode, attr);
419}
420static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout)
421{
422 if (unlikely(!audit_dummy_context()))
423 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
424}
425static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
426{
427 if (unlikely(!audit_dummy_context()))
428 __audit_mq_notify(mqdes, notification);
429}
430static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
431{
432 if (unlikely(!audit_dummy_context()))
433 __audit_mq_getsetattr(mqdes, mqstat);
434}
435
436static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
437 const struct cred *new,
438 const struct cred *old)
439{
440 if (unlikely(!audit_dummy_context()))
441 return __audit_log_bprm_fcaps(bprm, new, old);
442 return 0;
443}
444
445static inline void audit_log_capset(const struct cred *new,
446 const struct cred *old)
447{
448 if (unlikely(!audit_dummy_context()))
449 __audit_log_capset(new, old);
450}
451
452static inline void audit_mmap_fd(int fd, int flags)
453{
454 if (unlikely(!audit_dummy_context()))
455 __audit_mmap_fd(fd, flags);
456}
457
458static inline void audit_log_kern_module(char *name)
459{
460 if (!audit_dummy_context())
461 __audit_log_kern_module(name);
462}
463
464static inline void audit_fanotify(unsigned int response)
465{
466 if (!audit_dummy_context())
467 __audit_fanotify(response);
468}
469
470extern int audit_n_rules;
471extern int audit_signals;
472#else /* CONFIG_AUDITSYSCALL */
473static inline int audit_alloc(struct task_struct *task)
474{
475 return 0;
476}
477static inline void audit_free(struct task_struct *task)
478{ }
479static inline void audit_syscall_entry(int major, unsigned long a0,
480 unsigned long a1, unsigned long a2,
481 unsigned long a3)
482{ }
483static inline void audit_syscall_exit(void *pt_regs)
484{ }
485static inline bool audit_dummy_context(void)
486{
487 return true;
488}
489static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx)
490{ }
491static inline struct audit_context *audit_context(void)
492{
493 return NULL;
494}
495static inline struct filename *audit_reusename(const __user char *name)
496{
497 return NULL;
498}
499static inline void audit_getname(struct filename *name)
500{ }
501static inline void __audit_inode(struct filename *name,
502 const struct dentry *dentry,
503 unsigned int flags)
504{ }
505static inline void __audit_inode_child(struct inode *parent,
506 const struct dentry *dentry,
507 const unsigned char type)
508{ }
509static inline void audit_inode(struct filename *name,
510 const struct dentry *dentry,
511 unsigned int parent)
512{ }
513static inline void audit_file(struct file *file)
514{
515}
516static inline void audit_inode_parent_hidden(struct filename *name,
517 const struct dentry *dentry)
518{ }
519static inline void audit_inode_child(struct inode *parent,
520 const struct dentry *dentry,
521 const unsigned char type)
522{ }
523static inline void audit_core_dumps(long signr)
524{ }
525static inline void audit_seccomp(unsigned long syscall, long signr, int code)
526{ }
527static inline void audit_seccomp_actions_logged(const char *names,
528 const char *old_names, int res)
529{ }
530static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
531{ }
532static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
533 gid_t gid, umode_t mode)
534{ }
535static inline void audit_bprm(struct linux_binprm *bprm)
536{ }
537static inline int audit_socketcall(int nargs, unsigned long *args)
538{
539 return 0;
540}
541
542static inline int audit_socketcall_compat(int nargs, u32 *args)
543{
544 return 0;
545}
546
547static inline void audit_fd_pair(int fd1, int fd2)
548{ }
549static inline int audit_sockaddr(int len, void *addr)
550{
551 return 0;
552}
553static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
554{ }
555static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
556 unsigned int msg_prio,
557 const struct timespec64 *abs_timeout)
558{ }
559static inline void audit_mq_notify(mqd_t mqdes,
560 const struct sigevent *notification)
561{ }
562static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
563{ }
564static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
565 const struct cred *new,
566 const struct cred *old)
567{
568 return 0;
569}
570static inline void audit_log_capset(const struct cred *new,
571 const struct cred *old)
572{ }
573static inline void audit_mmap_fd(int fd, int flags)
574{ }
575
576static inline void audit_log_kern_module(char *name)
577{
578}
579
580static inline void audit_fanotify(unsigned int response)
581{ }
582
583static inline void audit_ptrace(struct task_struct *t)
584{ }
585#define audit_n_rules 0
586#define audit_signals 0
587#endif /* CONFIG_AUDITSYSCALL */
588
589static inline bool audit_loginuid_set(struct task_struct *tsk)
590{
591 return uid_valid(audit_get_loginuid(tsk));
592}
593
594static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
595{
596 audit_log_n_string(ab, buf, strlen(buf));
597}
598
599#endif