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