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