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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
83/* audit_names->type values */
84#define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */
85#define AUDIT_TYPE_NORMAL 1 /* a "normal" audit record */
86#define AUDIT_TYPE_PARENT 2 /* a parent audit record */
87#define AUDIT_TYPE_CHILD_DELETE 3 /* a child being deleted */
88#define AUDIT_TYPE_CHILD_CREATE 4 /* a child being created */
89
90/* maximized args number that audit_socketcall can process */
91#define AUDITSC_ARGS 6
92
93struct filename;
94
95extern void audit_log_session_info(struct audit_buffer *ab);
96
97#ifdef CONFIG_AUDITSYSCALL
98/* These are defined in auditsc.c */
99 /* Public API */
100extern int audit_alloc(struct task_struct *task);
101extern void __audit_free(struct task_struct *task);
102extern void __audit_syscall_entry(int arch,
103 int major, unsigned long a0, unsigned long a1,
104 unsigned long a2, unsigned long a3);
105extern void __audit_syscall_exit(int ret_success, long ret_value);
106extern struct filename *__audit_reusename(const __user char *uptr);
107extern void __audit_getname(struct filename *name);
108extern void audit_putname(struct filename *name);
109
110#define AUDIT_INODE_PARENT 1 /* dentry represents the parent */
111#define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */
112extern void __audit_inode(struct filename *name, const struct dentry *dentry,
113 unsigned int flags);
114extern void __audit_inode_child(const struct inode *parent,
115 const struct dentry *dentry,
116 const unsigned char type);
117extern void __audit_seccomp(unsigned long syscall, long signr, int code);
118extern void __audit_ptrace(struct task_struct *t);
119
120static inline int audit_dummy_context(void)
121{
122 void *p = current->audit_context;
123 return !p || *(int *)p;
124}
125static inline void audit_free(struct task_struct *task)
126{
127 if (unlikely(task->audit_context))
128 __audit_free(task);
129}
130static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
131 unsigned long a1, unsigned long a2,
132 unsigned long a3)
133{
134 if (unlikely(current->audit_context))
135 __audit_syscall_entry(arch, major, a0, a1, a2, a3);
136}
137static inline void audit_syscall_exit(void *pt_regs)
138{
139 if (unlikely(current->audit_context)) {
140 int success = is_syscall_success(pt_regs);
141 long return_code = regs_return_value(pt_regs);
142
143 __audit_syscall_exit(success, return_code);
144 }
145}
146static inline struct filename *audit_reusename(const __user char *name)
147{
148 if (unlikely(!audit_dummy_context()))
149 return __audit_reusename(name);
150 return NULL;
151}
152static inline void audit_getname(struct filename *name)
153{
154 if (unlikely(!audit_dummy_context()))
155 __audit_getname(name);
156}
157static inline void audit_inode(struct filename *name,
158 const struct dentry *dentry,
159 unsigned int parent) {
160 if (unlikely(!audit_dummy_context())) {
161 unsigned int flags = 0;
162 if (parent)
163 flags |= AUDIT_INODE_PARENT;
164 __audit_inode(name, dentry, flags);
165 }
166}
167static inline void audit_inode_parent_hidden(struct filename *name,
168 const struct dentry *dentry)
169{
170 if (unlikely(!audit_dummy_context()))
171 __audit_inode(name, dentry,
172 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
173}
174static inline void audit_inode_child(const struct inode *parent,
175 const struct dentry *dentry,
176 const unsigned char type) {
177 if (unlikely(!audit_dummy_context()))
178 __audit_inode_child(parent, dentry, type);
179}
180void audit_core_dumps(long signr);
181
182static inline void audit_seccomp(unsigned long syscall, long signr, int code)
183{
184 /* Force a record to be reported if a signal was delivered. */
185 if (signr || unlikely(!audit_dummy_context()))
186 __audit_seccomp(syscall, signr, code);
187}
188
189static inline void audit_ptrace(struct task_struct *t)
190{
191 if (unlikely(!audit_dummy_context()))
192 __audit_ptrace(t);
193}
194
195 /* Private API (for audit.c only) */
196extern unsigned int audit_serial(void);
197extern int auditsc_get_stamp(struct audit_context *ctx,
198 struct timespec *t, unsigned int *serial);
199extern int audit_set_loginuid(kuid_t loginuid);
200
201static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
202{
203 return tsk->loginuid;
204}
205
206static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
207{
208 return tsk->sessionid;
209}
210
211extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
212extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
213extern void __audit_bprm(struct linux_binprm *bprm);
214extern int __audit_socketcall(int nargs, unsigned long *args);
215extern int __audit_sockaddr(int len, void *addr);
216extern void __audit_fd_pair(int fd1, int fd2);
217extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
218extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
219extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
220extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
221extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
222 const struct cred *new,
223 const struct cred *old);
224extern void __audit_log_capset(const struct cred *new, const struct cred *old);
225extern void __audit_mmap_fd(int fd, int flags);
226
227static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
228{
229 if (unlikely(!audit_dummy_context()))
230 __audit_ipc_obj(ipcp);
231}
232static inline void audit_fd_pair(int fd1, int fd2)
233{
234 if (unlikely(!audit_dummy_context()))
235 __audit_fd_pair(fd1, fd2);
236}
237static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
238{
239 if (unlikely(!audit_dummy_context()))
240 __audit_ipc_set_perm(qbytes, uid, gid, mode);
241}
242static inline void audit_bprm(struct linux_binprm *bprm)
243{
244 if (unlikely(!audit_dummy_context()))
245 __audit_bprm(bprm);
246}
247static inline int audit_socketcall(int nargs, unsigned long *args)
248{
249 if (unlikely(!audit_dummy_context()))
250 return __audit_socketcall(nargs, args);
251 return 0;
252}
253static inline int audit_sockaddr(int len, void *addr)
254{
255 if (unlikely(!audit_dummy_context()))
256 return __audit_sockaddr(len, addr);
257 return 0;
258}
259static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
260{
261 if (unlikely(!audit_dummy_context()))
262 __audit_mq_open(oflag, mode, attr);
263}
264static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
265{
266 if (unlikely(!audit_dummy_context()))
267 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
268}
269static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
270{
271 if (unlikely(!audit_dummy_context()))
272 __audit_mq_notify(mqdes, notification);
273}
274static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
275{
276 if (unlikely(!audit_dummy_context()))
277 __audit_mq_getsetattr(mqdes, mqstat);
278}
279
280static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
281 const struct cred *new,
282 const struct cred *old)
283{
284 if (unlikely(!audit_dummy_context()))
285 return __audit_log_bprm_fcaps(bprm, new, old);
286 return 0;
287}
288
289static inline void audit_log_capset(const struct cred *new,
290 const struct cred *old)
291{
292 if (unlikely(!audit_dummy_context()))
293 __audit_log_capset(new, old);
294}
295
296static inline void audit_mmap_fd(int fd, int flags)
297{
298 if (unlikely(!audit_dummy_context()))
299 __audit_mmap_fd(fd, flags);
300}
301
302extern int audit_n_rules;
303extern int audit_signals;
304#else /* CONFIG_AUDITSYSCALL */
305static inline int audit_alloc(struct task_struct *task)
306{
307 return 0;
308}
309static inline void audit_free(struct task_struct *task)
310{ }
311static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
312 unsigned long a1, unsigned long a2,
313 unsigned long a3)
314{ }
315static inline void audit_syscall_exit(void *pt_regs)
316{ }
317static inline int audit_dummy_context(void)
318{
319 return 1;
320}
321static inline struct filename *audit_reusename(const __user char *name)
322{
323 return NULL;
324}
325static inline void audit_getname(struct filename *name)
326{ }
327static inline void audit_putname(struct filename *name)
328{ }
329static inline void __audit_inode(struct filename *name,
330 const struct dentry *dentry,
331 unsigned int flags)
332{ }
333static inline void __audit_inode_child(const struct inode *parent,
334 const struct dentry *dentry,
335 const unsigned char type)
336{ }
337static inline void audit_inode(struct filename *name,
338 const struct dentry *dentry,
339 unsigned int parent)
340{ }
341static inline void audit_inode_parent_hidden(struct filename *name,
342 const struct dentry *dentry)
343{ }
344static inline void audit_inode_child(const struct inode *parent,
345 const struct dentry *dentry,
346 const unsigned char type)
347{ }
348static inline void audit_core_dumps(long signr)
349{ }
350static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
351{ }
352static inline void audit_seccomp(unsigned long syscall, long signr, int code)
353{ }
354static inline int auditsc_get_stamp(struct audit_context *ctx,
355 struct timespec *t, unsigned int *serial)
356{
357 return 0;
358}
359static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
360{
361 return INVALID_UID;
362}
363static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
364{
365 return -1;
366}
367static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
368{ }
369static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
370 gid_t gid, umode_t mode)
371{ }
372static inline void audit_bprm(struct linux_binprm *bprm)
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(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_rule_change(int type, __u32 portid, int seq,
466 void *data, size_t datasz);
467extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
468
469extern u32 audit_enabled;
470#else /* CONFIG_AUDIT */
471static inline __printf(4, 5)
472void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
473 const char *fmt, ...)
474{ }
475static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
476 gfp_t gfp_mask, int type)
477{
478 return NULL;
479}
480static inline __printf(2, 3)
481void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
482{ }
483static inline void audit_log_end(struct audit_buffer *ab)
484{ }
485static inline void audit_log_n_hex(struct audit_buffer *ab,
486 const unsigned char *buf, size_t len)
487{ }
488static inline void audit_log_n_string(struct audit_buffer *ab,
489 const char *buf, size_t n)
490{ }
491static inline void audit_log_n_untrustedstring(struct audit_buffer *ab,
492 const char *string, size_t n)
493{ }
494static inline void audit_log_untrustedstring(struct audit_buffer *ab,
495 const char *string)
496{ }
497static inline void audit_log_d_path(struct audit_buffer *ab,
498 const char *prefix,
499 const struct path *path)
500{ }
501static inline void audit_log_key(struct audit_buffer *ab, char *key)
502{ }
503static inline void audit_log_link_denied(const char *string,
504 const struct path *link)
505{ }
506static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
507{ }
508static inline int audit_log_task_context(struct audit_buffer *ab)
509{
510 return 0;
511}
512static inline void audit_log_task_info(struct audit_buffer *ab,
513 struct task_struct *tsk)
514{ }
515#define audit_enabled 0
516#endif /* CONFIG_AUDIT */
517static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
518{
519 audit_log_n_string(ab, buf, strlen(buf));
520}
521
522#endif