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