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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_inode_child(const struct inode *parent,
134 const struct dentry *dentry,
135 const unsigned char type);
136extern void __audit_seccomp(unsigned long syscall, long signr, int code);
137extern void __audit_ptrace(struct task_struct *t);
138
139static inline int audit_dummy_context(void)
140{
141 void *p = current->audit_context;
142 return !p || *(int *)p;
143}
144static inline void audit_free(struct task_struct *task)
145{
146 if (unlikely(task->audit_context))
147 __audit_free(task);
148}
149static inline void audit_syscall_entry(int major, unsigned long a0,
150 unsigned long a1, unsigned long a2,
151 unsigned long a3)
152{
153 if (unlikely(current->audit_context))
154 __audit_syscall_entry(major, a0, a1, a2, a3);
155}
156static inline void audit_syscall_exit(void *pt_regs)
157{
158 if (unlikely(current->audit_context)) {
159 int success = is_syscall_success(pt_regs);
160 long return_code = regs_return_value(pt_regs);
161
162 __audit_syscall_exit(success, return_code);
163 }
164}
165static inline struct filename *audit_reusename(const __user char *name)
166{
167 if (unlikely(!audit_dummy_context()))
168 return __audit_reusename(name);
169 return NULL;
170}
171static inline void audit_getname(struct filename *name)
172{
173 if (unlikely(!audit_dummy_context()))
174 __audit_getname(name);
175}
176static inline void audit_inode(struct filename *name,
177 const struct dentry *dentry,
178 unsigned int parent) {
179 if (unlikely(!audit_dummy_context())) {
180 unsigned int flags = 0;
181 if (parent)
182 flags |= AUDIT_INODE_PARENT;
183 __audit_inode(name, dentry, flags);
184 }
185}
186static inline void audit_inode_parent_hidden(struct filename *name,
187 const struct dentry *dentry)
188{
189 if (unlikely(!audit_dummy_context()))
190 __audit_inode(name, dentry,
191 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
192}
193static inline void audit_inode_child(const struct inode *parent,
194 const struct dentry *dentry,
195 const unsigned char type) {
196 if (unlikely(!audit_dummy_context()))
197 __audit_inode_child(parent, dentry, type);
198}
199void audit_core_dumps(long signr);
200
201static inline void audit_seccomp(unsigned long syscall, long signr, int code)
202{
203 /* Force a record to be reported if a signal was delivered. */
204 if (signr || unlikely(!audit_dummy_context()))
205 __audit_seccomp(syscall, signr, code);
206}
207
208static inline void audit_ptrace(struct task_struct *t)
209{
210 if (unlikely(!audit_dummy_context()))
211 __audit_ptrace(t);
212}
213
214 /* Private API (for audit.c only) */
215extern unsigned int audit_serial(void);
216extern int auditsc_get_stamp(struct audit_context *ctx,
217 struct timespec *t, unsigned int *serial);
218extern int audit_set_loginuid(kuid_t loginuid);
219
220static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
221{
222 return tsk->loginuid;
223}
224
225static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
226{
227 return tsk->sessionid;
228}
229
230extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
231extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
232extern void __audit_bprm(struct linux_binprm *bprm);
233extern int __audit_socketcall(int nargs, unsigned long *args);
234extern int __audit_sockaddr(int len, void *addr);
235extern void __audit_fd_pair(int fd1, int fd2);
236extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
237extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
238extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
239extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
240extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
241 const struct cred *new,
242 const struct cred *old);
243extern void __audit_log_capset(const struct cred *new, const struct cred *old);
244extern void __audit_mmap_fd(int fd, int flags);
245
246static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
247{
248 if (unlikely(!audit_dummy_context()))
249 __audit_ipc_obj(ipcp);
250}
251static inline void audit_fd_pair(int fd1, int fd2)
252{
253 if (unlikely(!audit_dummy_context()))
254 __audit_fd_pair(fd1, fd2);
255}
256static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
257{
258 if (unlikely(!audit_dummy_context()))
259 __audit_ipc_set_perm(qbytes, uid, gid, mode);
260}
261static inline void audit_bprm(struct linux_binprm *bprm)
262{
263 if (unlikely(!audit_dummy_context()))
264 __audit_bprm(bprm);
265}
266static inline int audit_socketcall(int nargs, unsigned long *args)
267{
268 if (unlikely(!audit_dummy_context()))
269 return __audit_socketcall(nargs, args);
270 return 0;
271}
272static inline int audit_sockaddr(int len, void *addr)
273{
274 if (unlikely(!audit_dummy_context()))
275 return __audit_sockaddr(len, addr);
276 return 0;
277}
278static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
279{
280 if (unlikely(!audit_dummy_context()))
281 __audit_mq_open(oflag, mode, attr);
282}
283static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
284{
285 if (unlikely(!audit_dummy_context()))
286 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
287}
288static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
289{
290 if (unlikely(!audit_dummy_context()))
291 __audit_mq_notify(mqdes, notification);
292}
293static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
294{
295 if (unlikely(!audit_dummy_context()))
296 __audit_mq_getsetattr(mqdes, mqstat);
297}
298
299static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
300 const struct cred *new,
301 const struct cred *old)
302{
303 if (unlikely(!audit_dummy_context()))
304 return __audit_log_bprm_fcaps(bprm, new, old);
305 return 0;
306}
307
308static inline void audit_log_capset(const struct cred *new,
309 const struct cred *old)
310{
311 if (unlikely(!audit_dummy_context()))
312 __audit_log_capset(new, old);
313}
314
315static inline void audit_mmap_fd(int fd, int flags)
316{
317 if (unlikely(!audit_dummy_context()))
318 __audit_mmap_fd(fd, flags);
319}
320
321extern int audit_n_rules;
322extern int audit_signals;
323#else /* CONFIG_AUDITSYSCALL */
324static inline int audit_alloc(struct task_struct *task)
325{
326 return 0;
327}
328static inline void audit_free(struct task_struct *task)
329{ }
330static inline void audit_syscall_entry(int major, unsigned long a0,
331 unsigned long a1, unsigned long a2,
332 unsigned long a3)
333{ }
334static inline void audit_syscall_exit(void *pt_regs)
335{ }
336static inline int audit_dummy_context(void)
337{
338 return 1;
339}
340static inline struct filename *audit_reusename(const __user char *name)
341{
342 return NULL;
343}
344static inline void audit_getname(struct filename *name)
345{ }
346static inline void audit_putname(struct filename *name)
347{ }
348static inline void __audit_inode(struct filename *name,
349 const struct dentry *dentry,
350 unsigned int flags)
351{ }
352static inline void __audit_inode_child(const struct inode *parent,
353 const struct dentry *dentry,
354 const unsigned char type)
355{ }
356static inline void audit_inode(struct filename *name,
357 const struct dentry *dentry,
358 unsigned int parent)
359{ }
360static inline void audit_inode_parent_hidden(struct filename *name,
361 const struct dentry *dentry)
362{ }
363static inline void audit_inode_child(const struct inode *parent,
364 const struct dentry *dentry,
365 const unsigned char type)
366{ }
367static inline void audit_core_dumps(long signr)
368{ }
369static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
370{ }
371static inline void audit_seccomp(unsigned long syscall, long signr, int code)
372{ }
373static inline int auditsc_get_stamp(struct audit_context *ctx,
374 struct timespec *t, unsigned int *serial)
375{
376 return 0;
377}
378static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
379{
380 return INVALID_UID;
381}
382static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
383{
384 return -1;
385}
386static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
387{ }
388static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
389 gid_t gid, umode_t mode)
390{ }
391static inline void audit_bprm(struct linux_binprm *bprm)
392{ }
393static inline int audit_socketcall(int nargs, unsigned long *args)
394{
395 return 0;
396}
397static inline void audit_fd_pair(int fd1, int fd2)
398{ }
399static inline int audit_sockaddr(int len, void *addr)
400{
401 return 0;
402}
403static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
404{ }
405static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
406 unsigned int msg_prio,
407 const struct timespec *abs_timeout)
408{ }
409static inline void audit_mq_notify(mqd_t mqdes,
410 const struct sigevent *notification)
411{ }
412static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
413{ }
414static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
415 const struct cred *new,
416 const struct cred *old)
417{
418 return 0;
419}
420static inline void audit_log_capset(const struct cred *new,
421 const struct cred *old)
422{ }
423static inline void audit_mmap_fd(int fd, int flags)
424{ }
425static inline void audit_ptrace(struct task_struct *t)
426{ }
427#define audit_n_rules 0
428#define audit_signals 0
429#endif /* CONFIG_AUDITSYSCALL */
430
431static inline bool audit_loginuid_set(struct task_struct *tsk)
432{
433 return uid_valid(audit_get_loginuid(tsk));
434}
435
436#ifdef CONFIG_AUDIT
437/* These are defined in audit.c */
438 /* Public API */
439extern __printf(4, 5)
440void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
441 const char *fmt, ...);
442
443extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
444extern __printf(2, 3)
445void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
446extern void audit_log_end(struct audit_buffer *ab);
447extern int audit_string_contains_control(const char *string,
448 size_t len);
449extern void audit_log_n_hex(struct audit_buffer *ab,
450 const unsigned char *buf,
451 size_t len);
452extern void audit_log_n_string(struct audit_buffer *ab,
453 const char *buf,
454 size_t n);
455extern void audit_log_n_untrustedstring(struct audit_buffer *ab,
456 const char *string,
457 size_t n);
458extern void audit_log_untrustedstring(struct audit_buffer *ab,
459 const char *string);
460extern void audit_log_d_path(struct audit_buffer *ab,
461 const char *prefix,
462 const struct path *path);
463extern void audit_log_key(struct audit_buffer *ab,
464 char *key);
465extern void audit_log_link_denied(const char *operation,
466 struct path *link);
467extern void audit_log_lost(const char *message);
468#ifdef CONFIG_SECURITY
469extern void audit_log_secctx(struct audit_buffer *ab, u32 secid);
470#else
471static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
472{ }
473#endif
474
475extern int audit_log_task_context(struct audit_buffer *ab);
476extern void audit_log_task_info(struct audit_buffer *ab,
477 struct task_struct *tsk);
478
479extern int audit_update_lsm_rules(void);
480
481 /* Private API (for audit.c only) */
482extern int audit_filter_user(int type);
483extern int audit_filter_type(int type);
484extern int audit_rule_change(int type, __u32 portid, int seq,
485 void *data, size_t datasz);
486extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
487
488extern u32 audit_enabled;
489#else /* CONFIG_AUDIT */
490static inline __printf(4, 5)
491void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
492 const char *fmt, ...)
493{ }
494static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
495 gfp_t gfp_mask, int type)
496{
497 return NULL;
498}
499static inline __printf(2, 3)
500void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
501{ }
502static inline void audit_log_end(struct audit_buffer *ab)
503{ }
504static inline void audit_log_n_hex(struct audit_buffer *ab,
505 const unsigned char *buf, size_t len)
506{ }
507static inline void audit_log_n_string(struct audit_buffer *ab,
508 const char *buf, size_t n)
509{ }
510static inline void audit_log_n_untrustedstring(struct audit_buffer *ab,
511 const char *string, size_t n)
512{ }
513static inline void audit_log_untrustedstring(struct audit_buffer *ab,
514 const char *string)
515{ }
516static inline void audit_log_d_path(struct audit_buffer *ab,
517 const char *prefix,
518 const struct path *path)
519{ }
520static inline void audit_log_key(struct audit_buffer *ab, char *key)
521{ }
522static inline void audit_log_link_denied(const char *string,
523 const struct path *link)
524{ }
525static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
526{ }
527static inline int audit_log_task_context(struct audit_buffer *ab)
528{
529 return 0;
530}
531static inline void audit_log_task_info(struct audit_buffer *ab,
532 struct task_struct *tsk)
533{ }
534#define audit_enabled 0
535#endif /* CONFIG_AUDIT */
536static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
537{
538 audit_log_n_string(ab, buf, strlen(buf));
539}
540
541#endif