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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
30#define AUDIT_INO_UNSET ((unsigned long)-1)
31#define AUDIT_DEV_UNSET ((dev_t)-1)
32
33struct audit_sig_info {
34 uid_t uid;
35 pid_t pid;
36 char ctx[0];
37};
38
39struct audit_buffer;
40struct audit_context;
41struct inode;
42struct netlink_skb_parms;
43struct path;
44struct linux_binprm;
45struct mq_attr;
46struct mqstat;
47struct audit_watch;
48struct audit_tree;
49struct sk_buff;
50
51struct audit_krule {
52 u32 pflags;
53 u32 flags;
54 u32 listnr;
55 u32 action;
56 u32 mask[AUDIT_BITMASK_SIZE];
57 u32 buflen; /* for data alloc on list rules */
58 u32 field_count;
59 char *filterkey; /* ties events to rules */
60 struct audit_field *fields;
61 struct audit_field *arch_f; /* quick access to arch field */
62 struct audit_field *inode_f; /* quick access to an inode field */
63 struct audit_watch *watch; /* associated watch */
64 struct audit_tree *tree; /* associated watched tree */
65 struct audit_fsnotify_mark *exe;
66 struct list_head rlist; /* entry in audit_{watch,tree}.rules list */
67 struct list_head list; /* for AUDIT_LIST* purposes only */
68 u64 prio;
69};
70
71/* Flag to indicate legacy AUDIT_LOGINUID unset usage */
72#define AUDIT_LOGINUID_LEGACY 0x1
73
74struct audit_field {
75 u32 type;
76 union {
77 u32 val;
78 kuid_t uid;
79 kgid_t gid;
80 struct {
81 char *lsm_str;
82 void *lsm_rule;
83 };
84 };
85 u32 op;
86};
87
88extern int is_audit_feature_set(int which);
89
90extern int __init audit_register_class(int class, unsigned *list);
91extern int audit_classify_syscall(int abi, unsigned syscall);
92extern int audit_classify_arch(int arch);
93/* only for compat system calls */
94extern unsigned compat_write_class[];
95extern unsigned compat_read_class[];
96extern unsigned compat_dir_class[];
97extern unsigned compat_chattr_class[];
98extern unsigned compat_signal_class[];
99
100extern int audit_classify_compat_syscall(int abi, unsigned syscall);
101
102/* audit_names->type values */
103#define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */
104#define AUDIT_TYPE_NORMAL 1 /* a "normal" audit record */
105#define AUDIT_TYPE_PARENT 2 /* a parent audit record */
106#define AUDIT_TYPE_CHILD_DELETE 3 /* a child being deleted */
107#define AUDIT_TYPE_CHILD_CREATE 4 /* a child being created */
108
109/* maximized args number that audit_socketcall can process */
110#define AUDITSC_ARGS 6
111
112/* bit values for ->signal->audit_tty */
113#define AUDIT_TTY_ENABLE BIT(0)
114#define AUDIT_TTY_LOG_PASSWD BIT(1)
115
116struct filename;
117
118extern void audit_log_session_info(struct audit_buffer *ab);
119
120#ifdef CONFIG_AUDIT
121/* These are defined in audit.c */
122 /* Public API */
123extern __printf(4, 5)
124void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
125 const char *fmt, ...);
126
127extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
128extern __printf(2, 3)
129void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
130extern void audit_log_end(struct audit_buffer *ab);
131extern bool audit_string_contains_control(const char *string,
132 size_t len);
133extern void audit_log_n_hex(struct audit_buffer *ab,
134 const unsigned char *buf,
135 size_t len);
136extern void audit_log_n_string(struct audit_buffer *ab,
137 const char *buf,
138 size_t n);
139extern void audit_log_n_untrustedstring(struct audit_buffer *ab,
140 const char *string,
141 size_t n);
142extern void audit_log_untrustedstring(struct audit_buffer *ab,
143 const char *string);
144extern void audit_log_d_path(struct audit_buffer *ab,
145 const char *prefix,
146 const struct path *path);
147extern void audit_log_key(struct audit_buffer *ab,
148 char *key);
149extern void audit_log_link_denied(const char *operation,
150 struct path *link);
151extern void audit_log_lost(const char *message);
152#ifdef CONFIG_SECURITY
153extern void audit_log_secctx(struct audit_buffer *ab, u32 secid);
154#else
155static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
156{ }
157#endif
158
159extern int audit_log_task_context(struct audit_buffer *ab);
160extern void audit_log_task_info(struct audit_buffer *ab,
161 struct task_struct *tsk);
162
163extern int audit_update_lsm_rules(void);
164
165 /* Private API (for audit.c only) */
166extern int audit_filter_user(int type);
167extern int audit_filter_type(int type);
168extern int audit_rule_change(int type, __u32 portid, int seq,
169 void *data, size_t datasz);
170extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
171
172extern u32 audit_enabled;
173#else /* CONFIG_AUDIT */
174static inline __printf(4, 5)
175void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
176 const char *fmt, ...)
177{ }
178static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
179 gfp_t gfp_mask, int type)
180{
181 return NULL;
182}
183static inline __printf(2, 3)
184void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
185{ }
186static inline void audit_log_end(struct audit_buffer *ab)
187{ }
188static inline void audit_log_n_hex(struct audit_buffer *ab,
189 const unsigned char *buf, size_t len)
190{ }
191static inline void audit_log_n_string(struct audit_buffer *ab,
192 const char *buf, size_t n)
193{ }
194static inline void audit_log_n_untrustedstring(struct audit_buffer *ab,
195 const char *string, size_t n)
196{ }
197static inline void audit_log_untrustedstring(struct audit_buffer *ab,
198 const char *string)
199{ }
200static inline void audit_log_d_path(struct audit_buffer *ab,
201 const char *prefix,
202 const struct path *path)
203{ }
204static inline void audit_log_key(struct audit_buffer *ab, char *key)
205{ }
206static inline void audit_log_link_denied(const char *string,
207 const struct path *link)
208{ }
209static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
210{ }
211static inline int audit_log_task_context(struct audit_buffer *ab)
212{
213 return 0;
214}
215static inline void audit_log_task_info(struct audit_buffer *ab,
216 struct task_struct *tsk)
217{ }
218#define audit_enabled 0
219#endif /* CONFIG_AUDIT */
220
221#ifdef CONFIG_AUDIT_COMPAT_GENERIC
222#define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT))
223#else
224#define audit_is_compat(arch) false
225#endif
226
227#ifdef CONFIG_AUDITSYSCALL
228#include <asm/syscall.h> /* for syscall_get_arch() */
229
230/* These are defined in auditsc.c */
231 /* Public API */
232extern int audit_alloc(struct task_struct *task);
233extern void __audit_free(struct task_struct *task);
234extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
235 unsigned long a2, unsigned long a3);
236extern void __audit_syscall_exit(int ret_success, long ret_value);
237extern struct filename *__audit_reusename(const __user char *uptr);
238extern void __audit_getname(struct filename *name);
239
240#define AUDIT_INODE_PARENT 1 /* dentry represents the parent */
241#define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */
242extern void __audit_inode(struct filename *name, const struct dentry *dentry,
243 unsigned int flags);
244extern void __audit_file(const struct file *);
245extern void __audit_inode_child(struct inode *parent,
246 const struct dentry *dentry,
247 const unsigned char type);
248extern void __audit_seccomp(unsigned long syscall, long signr, int code);
249extern void __audit_ptrace(struct task_struct *t);
250
251static inline bool audit_dummy_context(void)
252{
253 void *p = current->audit_context;
254 return !p || *(int *)p;
255}
256static inline void audit_free(struct task_struct *task)
257{
258 if (unlikely(task->audit_context))
259 __audit_free(task);
260}
261static inline void audit_syscall_entry(int major, unsigned long a0,
262 unsigned long a1, unsigned long a2,
263 unsigned long a3)
264{
265 if (unlikely(current->audit_context))
266 __audit_syscall_entry(major, a0, a1, a2, a3);
267}
268static inline void audit_syscall_exit(void *pt_regs)
269{
270 if (unlikely(current->audit_context)) {
271 int success = is_syscall_success(pt_regs);
272 long return_code = regs_return_value(pt_regs);
273
274 __audit_syscall_exit(success, return_code);
275 }
276}
277static inline struct filename *audit_reusename(const __user char *name)
278{
279 if (unlikely(!audit_dummy_context()))
280 return __audit_reusename(name);
281 return NULL;
282}
283static inline void audit_getname(struct filename *name)
284{
285 if (unlikely(!audit_dummy_context()))
286 __audit_getname(name);
287}
288static inline void audit_inode(struct filename *name,
289 const struct dentry *dentry,
290 unsigned int parent) {
291 if (unlikely(!audit_dummy_context())) {
292 unsigned int flags = 0;
293 if (parent)
294 flags |= AUDIT_INODE_PARENT;
295 __audit_inode(name, dentry, flags);
296 }
297}
298static inline void audit_file(struct file *file)
299{
300 if (unlikely(!audit_dummy_context()))
301 __audit_file(file);
302}
303static inline void audit_inode_parent_hidden(struct filename *name,
304 const struct dentry *dentry)
305{
306 if (unlikely(!audit_dummy_context()))
307 __audit_inode(name, dentry,
308 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
309}
310static inline void audit_inode_child(struct inode *parent,
311 const struct dentry *dentry,
312 const unsigned char type) {
313 if (unlikely(!audit_dummy_context()))
314 __audit_inode_child(parent, dentry, type);
315}
316void audit_core_dumps(long signr);
317
318static inline void audit_seccomp(unsigned long syscall, long signr, int code)
319{
320 if (!audit_enabled)
321 return;
322
323 /* Force a record to be reported if a signal was delivered. */
324 if (signr || unlikely(!audit_dummy_context()))
325 __audit_seccomp(syscall, signr, code);
326}
327
328static inline void audit_ptrace(struct task_struct *t)
329{
330 if (unlikely(!audit_dummy_context()))
331 __audit_ptrace(t);
332}
333
334 /* Private API (for audit.c only) */
335extern unsigned int audit_serial(void);
336extern int auditsc_get_stamp(struct audit_context *ctx,
337 struct timespec *t, unsigned int *serial);
338extern int audit_set_loginuid(kuid_t loginuid);
339
340static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
341{
342 return tsk->loginuid;
343}
344
345static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
346{
347 return tsk->sessionid;
348}
349
350extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
351extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
352extern void __audit_bprm(struct linux_binprm *bprm);
353extern int __audit_socketcall(int nargs, unsigned long *args);
354extern int __audit_sockaddr(int len, void *addr);
355extern void __audit_fd_pair(int fd1, int fd2);
356extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
357extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
358extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
359extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
360extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
361 const struct cred *new,
362 const struct cred *old);
363extern void __audit_log_capset(const struct cred *new, const struct cred *old);
364extern void __audit_mmap_fd(int fd, int flags);
365
366static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
367{
368 if (unlikely(!audit_dummy_context()))
369 __audit_ipc_obj(ipcp);
370}
371static inline void audit_fd_pair(int fd1, int fd2)
372{
373 if (unlikely(!audit_dummy_context()))
374 __audit_fd_pair(fd1, fd2);
375}
376static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
377{
378 if (unlikely(!audit_dummy_context()))
379 __audit_ipc_set_perm(qbytes, uid, gid, mode);
380}
381static inline void audit_bprm(struct linux_binprm *bprm)
382{
383 if (unlikely(!audit_dummy_context()))
384 __audit_bprm(bprm);
385}
386static inline int audit_socketcall(int nargs, unsigned long *args)
387{
388 if (unlikely(!audit_dummy_context()))
389 return __audit_socketcall(nargs, args);
390 return 0;
391}
392static inline int audit_sockaddr(int len, void *addr)
393{
394 if (unlikely(!audit_dummy_context()))
395 return __audit_sockaddr(len, addr);
396 return 0;
397}
398static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
399{
400 if (unlikely(!audit_dummy_context()))
401 __audit_mq_open(oflag, mode, attr);
402}
403static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
404{
405 if (unlikely(!audit_dummy_context()))
406 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
407}
408static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
409{
410 if (unlikely(!audit_dummy_context()))
411 __audit_mq_notify(mqdes, notification);
412}
413static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
414{
415 if (unlikely(!audit_dummy_context()))
416 __audit_mq_getsetattr(mqdes, mqstat);
417}
418
419static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
420 const struct cred *new,
421 const struct cred *old)
422{
423 if (unlikely(!audit_dummy_context()))
424 return __audit_log_bprm_fcaps(bprm, new, old);
425 return 0;
426}
427
428static inline void audit_log_capset(const struct cred *new,
429 const struct cred *old)
430{
431 if (unlikely(!audit_dummy_context()))
432 __audit_log_capset(new, old);
433}
434
435static inline void audit_mmap_fd(int fd, int flags)
436{
437 if (unlikely(!audit_dummy_context()))
438 __audit_mmap_fd(fd, flags);
439}
440
441extern int audit_n_rules;
442extern int audit_signals;
443#else /* CONFIG_AUDITSYSCALL */
444static inline int audit_alloc(struct task_struct *task)
445{
446 return 0;
447}
448static inline void audit_free(struct task_struct *task)
449{ }
450static inline void audit_syscall_entry(int major, unsigned long a0,
451 unsigned long a1, unsigned long a2,
452 unsigned long a3)
453{ }
454static inline void audit_syscall_exit(void *pt_regs)
455{ }
456static inline bool audit_dummy_context(void)
457{
458 return true;
459}
460static inline struct filename *audit_reusename(const __user char *name)
461{
462 return NULL;
463}
464static inline void audit_getname(struct filename *name)
465{ }
466static inline void __audit_inode(struct filename *name,
467 const struct dentry *dentry,
468 unsigned int flags)
469{ }
470static inline void __audit_inode_child(struct inode *parent,
471 const struct dentry *dentry,
472 const unsigned char type)
473{ }
474static inline void audit_inode(struct filename *name,
475 const struct dentry *dentry,
476 unsigned int parent)
477{ }
478static inline void audit_file(struct file *file)
479{
480}
481static inline void audit_inode_parent_hidden(struct filename *name,
482 const struct dentry *dentry)
483{ }
484static inline void audit_inode_child(struct inode *parent,
485 const struct dentry *dentry,
486 const unsigned char type)
487{ }
488static inline void audit_core_dumps(long signr)
489{ }
490static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
491{ }
492static inline void audit_seccomp(unsigned long syscall, long signr, int code)
493{ }
494static inline int auditsc_get_stamp(struct audit_context *ctx,
495 struct timespec *t, unsigned int *serial)
496{
497 return 0;
498}
499static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
500{
501 return INVALID_UID;
502}
503static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
504{
505 return -1;
506}
507static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
508{ }
509static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
510 gid_t gid, umode_t mode)
511{ }
512static inline void audit_bprm(struct linux_binprm *bprm)
513{ }
514static inline int audit_socketcall(int nargs, unsigned long *args)
515{
516 return 0;
517}
518static inline void audit_fd_pair(int fd1, int fd2)
519{ }
520static inline int audit_sockaddr(int len, void *addr)
521{
522 return 0;
523}
524static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
525{ }
526static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
527 unsigned int msg_prio,
528 const struct timespec *abs_timeout)
529{ }
530static inline void audit_mq_notify(mqd_t mqdes,
531 const struct sigevent *notification)
532{ }
533static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
534{ }
535static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
536 const struct cred *new,
537 const struct cred *old)
538{
539 return 0;
540}
541static inline void audit_log_capset(const struct cred *new,
542 const struct cred *old)
543{ }
544static inline void audit_mmap_fd(int fd, int flags)
545{ }
546static inline void audit_ptrace(struct task_struct *t)
547{ }
548#define audit_n_rules 0
549#define audit_signals 0
550#endif /* CONFIG_AUDITSYSCALL */
551
552static inline bool audit_loginuid_set(struct task_struct *tsk)
553{
554 return uid_valid(audit_get_loginuid(tsk));
555}
556
557static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
558{
559 audit_log_n_string(ab, buf, strlen(buf));
560}
561
562#endif