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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 <uapi/linux/audit.h>
29
30#define AUDIT_INO_UNSET ((unsigned long)-1)
31#define AUDIT_DEV_UNSET ((dev_t)-1)
32
33struct audit_sig_info {
34 uid_t uid;
35 pid_t pid;
36 char ctx[0];
37};
38
39struct audit_buffer;
40struct audit_context;
41struct inode;
42struct netlink_skb_parms;
43struct path;
44struct linux_binprm;
45struct mq_attr;
46struct mqstat;
47struct audit_watch;
48struct audit_tree;
49struct sk_buff;
50
51struct audit_krule {
52 u32 pflags;
53 u32 flags;
54 u32 listnr;
55 u32 action;
56 u32 mask[AUDIT_BITMASK_SIZE];
57 u32 buflen; /* for data alloc on list rules */
58 u32 field_count;
59 char *filterkey; /* ties events to rules */
60 struct audit_field *fields;
61 struct audit_field *arch_f; /* quick access to arch field */
62 struct audit_field *inode_f; /* quick access to an inode field */
63 struct audit_watch *watch; /* associated watch */
64 struct audit_tree *tree; /* associated watched tree */
65 struct audit_fsnotify_mark *exe;
66 struct list_head rlist; /* entry in audit_{watch,tree}.rules list */
67 struct list_head list; /* for AUDIT_LIST* purposes only */
68 u64 prio;
69};
70
71/* Flag to indicate legacy AUDIT_LOGINUID unset usage */
72#define AUDIT_LOGINUID_LEGACY 0x1
73
74struct audit_field {
75 u32 type;
76 union {
77 u32 val;
78 kuid_t uid;
79 kgid_t gid;
80 struct {
81 char *lsm_str;
82 void *lsm_rule;
83 };
84 };
85 u32 op;
86};
87
88extern int is_audit_feature_set(int which);
89
90extern int __init audit_register_class(int class, unsigned *list);
91extern int audit_classify_syscall(int abi, unsigned syscall);
92extern int audit_classify_arch(int arch);
93/* only for compat system calls */
94extern unsigned compat_write_class[];
95extern unsigned compat_read_class[];
96extern unsigned compat_dir_class[];
97extern unsigned compat_chattr_class[];
98extern unsigned compat_signal_class[];
99
100extern int audit_classify_compat_syscall(int abi, unsigned syscall);
101
102/* audit_names->type values */
103#define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */
104#define AUDIT_TYPE_NORMAL 1 /* a "normal" audit record */
105#define AUDIT_TYPE_PARENT 2 /* a parent audit record */
106#define AUDIT_TYPE_CHILD_DELETE 3 /* a child being deleted */
107#define AUDIT_TYPE_CHILD_CREATE 4 /* a child being created */
108
109/* maximized args number that audit_socketcall can process */
110#define AUDITSC_ARGS 6
111
112struct filename;
113
114extern void audit_log_session_info(struct audit_buffer *ab);
115
116#ifdef CONFIG_AUDIT
117/* These are defined in audit.c */
118 /* Public API */
119extern __printf(4, 5)
120void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
121 const char *fmt, ...);
122
123extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
124extern __printf(2, 3)
125void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
126extern void audit_log_end(struct audit_buffer *ab);
127extern bool audit_string_contains_control(const char *string,
128 size_t len);
129extern void audit_log_n_hex(struct audit_buffer *ab,
130 const unsigned char *buf,
131 size_t len);
132extern void audit_log_n_string(struct audit_buffer *ab,
133 const char *buf,
134 size_t n);
135extern void audit_log_n_untrustedstring(struct audit_buffer *ab,
136 const char *string,
137 size_t n);
138extern void audit_log_untrustedstring(struct audit_buffer *ab,
139 const char *string);
140extern void audit_log_d_path(struct audit_buffer *ab,
141 const char *prefix,
142 const struct path *path);
143extern void audit_log_key(struct audit_buffer *ab,
144 char *key);
145extern void audit_log_link_denied(const char *operation,
146 struct path *link);
147extern void audit_log_lost(const char *message);
148#ifdef CONFIG_SECURITY
149extern void audit_log_secctx(struct audit_buffer *ab, u32 secid);
150#else
151static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
152{ }
153#endif
154
155extern int audit_log_task_context(struct audit_buffer *ab);
156extern void audit_log_task_info(struct audit_buffer *ab,
157 struct task_struct *tsk);
158
159extern int audit_update_lsm_rules(void);
160
161 /* Private API (for audit.c only) */
162extern int audit_filter_user(int type);
163extern int audit_filter_type(int type);
164extern int audit_rule_change(int type, __u32 portid, int seq,
165 void *data, size_t datasz);
166extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
167
168extern u32 audit_enabled;
169#else /* CONFIG_AUDIT */
170static inline __printf(4, 5)
171void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
172 const char *fmt, ...)
173{ }
174static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
175 gfp_t gfp_mask, int type)
176{
177 return NULL;
178}
179static inline __printf(2, 3)
180void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
181{ }
182static inline void audit_log_end(struct audit_buffer *ab)
183{ }
184static inline void audit_log_n_hex(struct audit_buffer *ab,
185 const unsigned char *buf, size_t len)
186{ }
187static inline void audit_log_n_string(struct audit_buffer *ab,
188 const char *buf, size_t n)
189{ }
190static inline void audit_log_n_untrustedstring(struct audit_buffer *ab,
191 const char *string, size_t n)
192{ }
193static inline void audit_log_untrustedstring(struct audit_buffer *ab,
194 const char *string)
195{ }
196static inline void audit_log_d_path(struct audit_buffer *ab,
197 const char *prefix,
198 const struct path *path)
199{ }
200static inline void audit_log_key(struct audit_buffer *ab, char *key)
201{ }
202static inline void audit_log_link_denied(const char *string,
203 const struct path *link)
204{ }
205static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
206{ }
207static inline int audit_log_task_context(struct audit_buffer *ab)
208{
209 return 0;
210}
211static inline void audit_log_task_info(struct audit_buffer *ab,
212 struct task_struct *tsk)
213{ }
214#define audit_enabled 0
215#endif /* CONFIG_AUDIT */
216
217#ifdef CONFIG_AUDIT_COMPAT_GENERIC
218#define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT))
219#else
220#define audit_is_compat(arch) false
221#endif
222
223#ifdef CONFIG_AUDITSYSCALL
224#include <asm/syscall.h> /* for syscall_get_arch() */
225
226/* These are defined in auditsc.c */
227 /* Public API */
228extern int audit_alloc(struct task_struct *task);
229extern void __audit_free(struct task_struct *task);
230extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
231 unsigned long a2, unsigned long a3);
232extern void __audit_syscall_exit(int ret_success, long ret_value);
233extern struct filename *__audit_reusename(const __user char *uptr);
234extern void __audit_getname(struct filename *name);
235
236#define AUDIT_INODE_PARENT 1 /* dentry represents the parent */
237#define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */
238extern void __audit_inode(struct filename *name, const struct dentry *dentry,
239 unsigned int flags);
240extern void __audit_file(const struct file *);
241extern void __audit_inode_child(struct inode *parent,
242 const struct dentry *dentry,
243 const unsigned char type);
244extern void __audit_seccomp(unsigned long syscall, long signr, int code);
245extern void __audit_ptrace(struct task_struct *t);
246
247static inline bool audit_dummy_context(void)
248{
249 void *p = current->audit_context;
250 return !p || *(int *)p;
251}
252static inline void audit_free(struct task_struct *task)
253{
254 if (unlikely(task->audit_context))
255 __audit_free(task);
256}
257static inline void audit_syscall_entry(int major, unsigned long a0,
258 unsigned long a1, unsigned long a2,
259 unsigned long a3)
260{
261 if (unlikely(current->audit_context))
262 __audit_syscall_entry(major, a0, a1, a2, a3);
263}
264static inline void audit_syscall_exit(void *pt_regs)
265{
266 if (unlikely(current->audit_context)) {
267 int success = is_syscall_success(pt_regs);
268 long return_code = regs_return_value(pt_regs);
269
270 __audit_syscall_exit(success, return_code);
271 }
272}
273static inline struct filename *audit_reusename(const __user char *name)
274{
275 if (unlikely(!audit_dummy_context()))
276 return __audit_reusename(name);
277 return NULL;
278}
279static inline void audit_getname(struct filename *name)
280{
281 if (unlikely(!audit_dummy_context()))
282 __audit_getname(name);
283}
284static inline void audit_inode(struct filename *name,
285 const struct dentry *dentry,
286 unsigned int parent) {
287 if (unlikely(!audit_dummy_context())) {
288 unsigned int flags = 0;
289 if (parent)
290 flags |= AUDIT_INODE_PARENT;
291 __audit_inode(name, dentry, flags);
292 }
293}
294static inline void audit_file(struct file *file)
295{
296 if (unlikely(!audit_dummy_context()))
297 __audit_file(file);
298}
299static inline void audit_inode_parent_hidden(struct filename *name,
300 const struct dentry *dentry)
301{
302 if (unlikely(!audit_dummy_context()))
303 __audit_inode(name, dentry,
304 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
305}
306static inline void audit_inode_child(struct inode *parent,
307 const struct dentry *dentry,
308 const unsigned char type) {
309 if (unlikely(!audit_dummy_context()))
310 __audit_inode_child(parent, dentry, type);
311}
312void audit_core_dumps(long signr);
313
314static inline void audit_seccomp(unsigned long syscall, long signr, int code)
315{
316 if (!audit_enabled)
317 return;
318
319 /* Force a record to be reported if a signal was delivered. */
320 if (signr || unlikely(!audit_dummy_context()))
321 __audit_seccomp(syscall, signr, code);
322}
323
324static inline void audit_ptrace(struct task_struct *t)
325{
326 if (unlikely(!audit_dummy_context()))
327 __audit_ptrace(t);
328}
329
330 /* Private API (for audit.c only) */
331extern unsigned int audit_serial(void);
332extern int auditsc_get_stamp(struct audit_context *ctx,
333 struct timespec *t, unsigned int *serial);
334extern int audit_set_loginuid(kuid_t loginuid);
335
336static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
337{
338 return tsk->loginuid;
339}
340
341static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
342{
343 return tsk->sessionid;
344}
345
346extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
347extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
348extern void __audit_bprm(struct linux_binprm *bprm);
349extern int __audit_socketcall(int nargs, unsigned long *args);
350extern int __audit_sockaddr(int len, void *addr);
351extern void __audit_fd_pair(int fd1, int fd2);
352extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
353extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
354extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
355extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
356extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
357 const struct cred *new,
358 const struct cred *old);
359extern void __audit_log_capset(const struct cred *new, const struct cred *old);
360extern void __audit_mmap_fd(int fd, int flags);
361
362static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
363{
364 if (unlikely(!audit_dummy_context()))
365 __audit_ipc_obj(ipcp);
366}
367static inline void audit_fd_pair(int fd1, int fd2)
368{
369 if (unlikely(!audit_dummy_context()))
370 __audit_fd_pair(fd1, fd2);
371}
372static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
373{
374 if (unlikely(!audit_dummy_context()))
375 __audit_ipc_set_perm(qbytes, uid, gid, mode);
376}
377static inline void audit_bprm(struct linux_binprm *bprm)
378{
379 if (unlikely(!audit_dummy_context()))
380 __audit_bprm(bprm);
381}
382static inline int audit_socketcall(int nargs, unsigned long *args)
383{
384 if (unlikely(!audit_dummy_context()))
385 return __audit_socketcall(nargs, args);
386 return 0;
387}
388static inline int audit_sockaddr(int len, void *addr)
389{
390 if (unlikely(!audit_dummy_context()))
391 return __audit_sockaddr(len, addr);
392 return 0;
393}
394static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
395{
396 if (unlikely(!audit_dummy_context()))
397 __audit_mq_open(oflag, mode, attr);
398}
399static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
400{
401 if (unlikely(!audit_dummy_context()))
402 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
403}
404static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
405{
406 if (unlikely(!audit_dummy_context()))
407 __audit_mq_notify(mqdes, notification);
408}
409static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
410{
411 if (unlikely(!audit_dummy_context()))
412 __audit_mq_getsetattr(mqdes, mqstat);
413}
414
415static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
416 const struct cred *new,
417 const struct cred *old)
418{
419 if (unlikely(!audit_dummy_context()))
420 return __audit_log_bprm_fcaps(bprm, new, old);
421 return 0;
422}
423
424static inline void audit_log_capset(const struct cred *new,
425 const struct cred *old)
426{
427 if (unlikely(!audit_dummy_context()))
428 __audit_log_capset(new, old);
429}
430
431static inline void audit_mmap_fd(int fd, int flags)
432{
433 if (unlikely(!audit_dummy_context()))
434 __audit_mmap_fd(fd, flags);
435}
436
437extern int audit_n_rules;
438extern int audit_signals;
439#else /* CONFIG_AUDITSYSCALL */
440static inline int audit_alloc(struct task_struct *task)
441{
442 return 0;
443}
444static inline void audit_free(struct task_struct *task)
445{ }
446static inline void audit_syscall_entry(int major, unsigned long a0,
447 unsigned long a1, unsigned long a2,
448 unsigned long a3)
449{ }
450static inline void audit_syscall_exit(void *pt_regs)
451{ }
452static inline bool audit_dummy_context(void)
453{
454 return true;
455}
456static inline struct filename *audit_reusename(const __user char *name)
457{
458 return NULL;
459}
460static inline void audit_getname(struct filename *name)
461{ }
462static inline void __audit_inode(struct filename *name,
463 const struct dentry *dentry,
464 unsigned int flags)
465{ }
466static inline void __audit_inode_child(struct inode *parent,
467 const struct dentry *dentry,
468 const unsigned char type)
469{ }
470static inline void audit_inode(struct filename *name,
471 const struct dentry *dentry,
472 unsigned int parent)
473{ }
474static inline void audit_file(struct file *file)
475{
476}
477static inline void audit_inode_parent_hidden(struct filename *name,
478 const struct dentry *dentry)
479{ }
480static inline void audit_inode_child(struct inode *parent,
481 const struct dentry *dentry,
482 const unsigned char type)
483{ }
484static inline void audit_core_dumps(long signr)
485{ }
486static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
487{ }
488static inline void audit_seccomp(unsigned long syscall, long signr, int code)
489{ }
490static inline int auditsc_get_stamp(struct audit_context *ctx,
491 struct timespec *t, unsigned int *serial)
492{
493 return 0;
494}
495static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
496{
497 return INVALID_UID;
498}
499static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
500{
501 return -1;
502}
503static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
504{ }
505static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
506 gid_t gid, umode_t mode)
507{ }
508static inline void audit_bprm(struct linux_binprm *bprm)
509{ }
510static inline int audit_socketcall(int nargs, unsigned long *args)
511{
512 return 0;
513}
514static inline void audit_fd_pair(int fd1, int fd2)
515{ }
516static inline int audit_sockaddr(int len, void *addr)
517{
518 return 0;
519}
520static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
521{ }
522static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
523 unsigned int msg_prio,
524 const struct timespec *abs_timeout)
525{ }
526static inline void audit_mq_notify(mqd_t mqdes,
527 const struct sigevent *notification)
528{ }
529static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
530{ }
531static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
532 const struct cred *new,
533 const struct cred *old)
534{
535 return 0;
536}
537static inline void audit_log_capset(const struct cred *new,
538 const struct cred *old)
539{ }
540static inline void audit_mmap_fd(int fd, int flags)
541{ }
542static inline void audit_ptrace(struct task_struct *t)
543{ }
544#define audit_n_rules 0
545#define audit_signals 0
546#endif /* CONFIG_AUDITSYSCALL */
547
548static inline bool audit_loginuid_set(struct task_struct *tsk)
549{
550 return uid_valid(audit_get_loginuid(tsk));
551}
552
553static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
554{
555 audit_log_n_string(ab, buf, strlen(buf));
556}
557
558#endif