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