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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#include <linux/tty.h>
30
31#define AUDIT_INO_UNSET ((unsigned long)-1)
32#define AUDIT_DEV_UNSET ((dev_t)-1)
33
34struct audit_sig_info {
35 uid_t uid;
36 pid_t pid;
37 char ctx[0];
38};
39
40struct audit_buffer;
41struct audit_context;
42struct inode;
43struct netlink_skb_parms;
44struct path;
45struct linux_binprm;
46struct mq_attr;
47struct mqstat;
48struct audit_watch;
49struct audit_tree;
50struct sk_buff;
51
52struct audit_krule {
53 u32 pflags;
54 u32 flags;
55 u32 listnr;
56 u32 action;
57 u32 mask[AUDIT_BITMASK_SIZE];
58 u32 buflen; /* for data alloc on list rules */
59 u32 field_count;
60 char *filterkey; /* ties events to rules */
61 struct audit_field *fields;
62 struct audit_field *arch_f; /* quick access to arch field */
63 struct audit_field *inode_f; /* quick access to an inode field */
64 struct audit_watch *watch; /* associated watch */
65 struct audit_tree *tree; /* associated watched tree */
66 struct audit_fsnotify_mark *exe;
67 struct list_head rlist; /* entry in audit_{watch,tree}.rules list */
68 struct list_head list; /* for AUDIT_LIST* purposes only */
69 u64 prio;
70};
71
72/* Flag to indicate legacy AUDIT_LOGINUID unset usage */
73#define AUDIT_LOGINUID_LEGACY 0x1
74
75struct audit_field {
76 u32 type;
77 union {
78 u32 val;
79 kuid_t uid;
80 kgid_t gid;
81 struct {
82 char *lsm_str;
83 void *lsm_rule;
84 };
85 };
86 u32 op;
87};
88
89extern int is_audit_feature_set(int which);
90
91extern int __init audit_register_class(int class, unsigned *list);
92extern int audit_classify_syscall(int abi, unsigned syscall);
93extern int audit_classify_arch(int arch);
94/* only for compat system calls */
95extern unsigned compat_write_class[];
96extern unsigned compat_read_class[];
97extern unsigned compat_dir_class[];
98extern unsigned compat_chattr_class[];
99extern unsigned compat_signal_class[];
100
101extern int audit_classify_compat_syscall(int abi, unsigned syscall);
102
103/* audit_names->type values */
104#define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */
105#define AUDIT_TYPE_NORMAL 1 /* a "normal" audit record */
106#define AUDIT_TYPE_PARENT 2 /* a parent audit record */
107#define AUDIT_TYPE_CHILD_DELETE 3 /* a child being deleted */
108#define AUDIT_TYPE_CHILD_CREATE 4 /* a child being created */
109
110/* maximized args number that audit_socketcall can process */
111#define AUDITSC_ARGS 6
112
113/* bit values for ->signal->audit_tty */
114#define AUDIT_TTY_ENABLE BIT(0)
115#define AUDIT_TTY_LOG_PASSWD BIT(1)
116
117struct filename;
118
119extern void audit_log_session_info(struct audit_buffer *ab);
120
121#ifdef CONFIG_AUDIT
122/* These are defined in audit.c */
123 /* Public API */
124extern __printf(4, 5)
125void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
126 const char *fmt, ...);
127
128extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
129extern __printf(2, 3)
130void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
131extern void audit_log_end(struct audit_buffer *ab);
132extern bool audit_string_contains_control(const char *string,
133 size_t len);
134extern void audit_log_n_hex(struct audit_buffer *ab,
135 const unsigned char *buf,
136 size_t len);
137extern void audit_log_n_string(struct audit_buffer *ab,
138 const char *buf,
139 size_t n);
140extern void audit_log_n_untrustedstring(struct audit_buffer *ab,
141 const char *string,
142 size_t n);
143extern void audit_log_untrustedstring(struct audit_buffer *ab,
144 const char *string);
145extern void audit_log_d_path(struct audit_buffer *ab,
146 const char *prefix,
147 const struct path *path);
148extern void audit_log_key(struct audit_buffer *ab,
149 char *key);
150extern void audit_log_link_denied(const char *operation,
151 struct path *link);
152extern void audit_log_lost(const char *message);
153#ifdef CONFIG_SECURITY
154extern void audit_log_secctx(struct audit_buffer *ab, u32 secid);
155#else
156static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
157{ }
158#endif
159
160extern int audit_log_task_context(struct audit_buffer *ab);
161extern void audit_log_task_info(struct audit_buffer *ab,
162 struct task_struct *tsk);
163
164extern int audit_update_lsm_rules(void);
165
166 /* Private API (for audit.c only) */
167extern int audit_filter_user(int type);
168extern int audit_filter_type(int type);
169extern int audit_rule_change(int type, __u32 portid, int seq,
170 void *data, size_t datasz);
171extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
172
173extern u32 audit_enabled;
174#else /* CONFIG_AUDIT */
175static inline __printf(4, 5)
176void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
177 const char *fmt, ...)
178{ }
179static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
180 gfp_t gfp_mask, int type)
181{
182 return NULL;
183}
184static inline __printf(2, 3)
185void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
186{ }
187static inline void audit_log_end(struct audit_buffer *ab)
188{ }
189static inline void audit_log_n_hex(struct audit_buffer *ab,
190 const unsigned char *buf, size_t len)
191{ }
192static inline void audit_log_n_string(struct audit_buffer *ab,
193 const char *buf, size_t n)
194{ }
195static inline void audit_log_n_untrustedstring(struct audit_buffer *ab,
196 const char *string, size_t n)
197{ }
198static inline void audit_log_untrustedstring(struct audit_buffer *ab,
199 const char *string)
200{ }
201static inline void audit_log_d_path(struct audit_buffer *ab,
202 const char *prefix,
203 const struct path *path)
204{ }
205static inline void audit_log_key(struct audit_buffer *ab, char *key)
206{ }
207static inline void audit_log_link_denied(const char *string,
208 const struct path *link)
209{ }
210static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
211{ }
212static inline int audit_log_task_context(struct audit_buffer *ab)
213{
214 return 0;
215}
216static inline void audit_log_task_info(struct audit_buffer *ab,
217 struct task_struct *tsk)
218{ }
219#define audit_enabled 0
220#endif /* CONFIG_AUDIT */
221
222#ifdef CONFIG_AUDIT_COMPAT_GENERIC
223#define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT))
224#else
225#define audit_is_compat(arch) false
226#endif
227
228#ifdef CONFIG_AUDITSYSCALL
229#include <asm/syscall.h> /* for syscall_get_arch() */
230
231/* These are defined in auditsc.c */
232 /* Public API */
233extern int audit_alloc(struct task_struct *task);
234extern void __audit_free(struct task_struct *task);
235extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
236 unsigned long a2, unsigned long a3);
237extern void __audit_syscall_exit(int ret_success, long ret_value);
238extern struct filename *__audit_reusename(const __user char *uptr);
239extern void __audit_getname(struct filename *name);
240
241#define AUDIT_INODE_PARENT 1 /* dentry represents the parent */
242#define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */
243extern void __audit_inode(struct filename *name, const struct dentry *dentry,
244 unsigned int flags);
245extern void __audit_file(const struct file *);
246extern void __audit_inode_child(struct inode *parent,
247 const struct dentry *dentry,
248 const unsigned char type);
249extern void __audit_seccomp(unsigned long syscall, long signr, int code);
250extern void __audit_ptrace(struct task_struct *t);
251
252static inline bool audit_dummy_context(void)
253{
254 void *p = current->audit_context;
255 return !p || *(int *)p;
256}
257static inline void audit_free(struct task_struct *task)
258{
259 if (unlikely(task->audit_context))
260 __audit_free(task);
261}
262static inline void audit_syscall_entry(int major, unsigned long a0,
263 unsigned long a1, unsigned long a2,
264 unsigned long a3)
265{
266 if (unlikely(current->audit_context))
267 __audit_syscall_entry(major, a0, a1, a2, a3);
268}
269static inline void audit_syscall_exit(void *pt_regs)
270{
271 if (unlikely(current->audit_context)) {
272 int success = is_syscall_success(pt_regs);
273 long return_code = regs_return_value(pt_regs);
274
275 __audit_syscall_exit(success, return_code);
276 }
277}
278static inline struct filename *audit_reusename(const __user char *name)
279{
280 if (unlikely(!audit_dummy_context()))
281 return __audit_reusename(name);
282 return NULL;
283}
284static inline void audit_getname(struct filename *name)
285{
286 if (unlikely(!audit_dummy_context()))
287 __audit_getname(name);
288}
289static inline void audit_inode(struct filename *name,
290 const struct dentry *dentry,
291 unsigned int parent) {
292 if (unlikely(!audit_dummy_context())) {
293 unsigned int flags = 0;
294 if (parent)
295 flags |= AUDIT_INODE_PARENT;
296 __audit_inode(name, dentry, flags);
297 }
298}
299static inline void audit_file(struct file *file)
300{
301 if (unlikely(!audit_dummy_context()))
302 __audit_file(file);
303}
304static inline void audit_inode_parent_hidden(struct filename *name,
305 const struct dentry *dentry)
306{
307 if (unlikely(!audit_dummy_context()))
308 __audit_inode(name, dentry,
309 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
310}
311static inline void audit_inode_child(struct inode *parent,
312 const struct dentry *dentry,
313 const unsigned char type) {
314 if (unlikely(!audit_dummy_context()))
315 __audit_inode_child(parent, dentry, type);
316}
317void audit_core_dumps(long signr);
318
319static inline void audit_seccomp(unsigned long syscall, long signr, int code)
320{
321 if (!audit_enabled)
322 return;
323
324 /* Force a record to be reported if a signal was delivered. */
325 if (signr || unlikely(!audit_dummy_context()))
326 __audit_seccomp(syscall, signr, code);
327}
328
329static inline void audit_ptrace(struct task_struct *t)
330{
331 if (unlikely(!audit_dummy_context()))
332 __audit_ptrace(t);
333}
334
335 /* Private API (for audit.c only) */
336extern unsigned int audit_serial(void);
337extern int auditsc_get_stamp(struct audit_context *ctx,
338 struct timespec *t, unsigned int *serial);
339extern int audit_set_loginuid(kuid_t loginuid);
340
341static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
342{
343 return tsk->loginuid;
344}
345
346static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
347{
348 return tsk->sessionid;
349}
350
351static inline struct tty_struct *audit_get_tty(struct task_struct *tsk)
352{
353 struct tty_struct *tty = NULL;
354 unsigned long flags;
355
356 spin_lock_irqsave(&tsk->sighand->siglock, flags);
357 if (tsk->signal)
358 tty = tty_kref_get(tsk->signal->tty);
359 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
360 return tty;
361}
362
363static inline void audit_put_tty(struct tty_struct *tty)
364{
365 tty_kref_put(tty);
366}
367
368extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
369extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
370extern void __audit_bprm(struct linux_binprm *bprm);
371extern int __audit_socketcall(int nargs, unsigned long *args);
372extern int __audit_sockaddr(int len, void *addr);
373extern void __audit_fd_pair(int fd1, int fd2);
374extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
375extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
376extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
377extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
378extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
379 const struct cred *new,
380 const struct cred *old);
381extern void __audit_log_capset(const struct cred *new, const struct cred *old);
382extern void __audit_mmap_fd(int fd, int flags);
383
384static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
385{
386 if (unlikely(!audit_dummy_context()))
387 __audit_ipc_obj(ipcp);
388}
389static inline void audit_fd_pair(int fd1, int fd2)
390{
391 if (unlikely(!audit_dummy_context()))
392 __audit_fd_pair(fd1, fd2);
393}
394static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
395{
396 if (unlikely(!audit_dummy_context()))
397 __audit_ipc_set_perm(qbytes, uid, gid, mode);
398}
399static inline void audit_bprm(struct linux_binprm *bprm)
400{
401 if (unlikely(!audit_dummy_context()))
402 __audit_bprm(bprm);
403}
404static inline int audit_socketcall(int nargs, unsigned long *args)
405{
406 if (unlikely(!audit_dummy_context()))
407 return __audit_socketcall(nargs, args);
408 return 0;
409}
410static inline int audit_sockaddr(int len, void *addr)
411{
412 if (unlikely(!audit_dummy_context()))
413 return __audit_sockaddr(len, addr);
414 return 0;
415}
416static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
417{
418 if (unlikely(!audit_dummy_context()))
419 __audit_mq_open(oflag, mode, attr);
420}
421static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
422{
423 if (unlikely(!audit_dummy_context()))
424 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
425}
426static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
427{
428 if (unlikely(!audit_dummy_context()))
429 __audit_mq_notify(mqdes, notification);
430}
431static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
432{
433 if (unlikely(!audit_dummy_context()))
434 __audit_mq_getsetattr(mqdes, mqstat);
435}
436
437static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
438 const struct cred *new,
439 const struct cred *old)
440{
441 if (unlikely(!audit_dummy_context()))
442 return __audit_log_bprm_fcaps(bprm, new, old);
443 return 0;
444}
445
446static inline void audit_log_capset(const struct cred *new,
447 const struct cred *old)
448{
449 if (unlikely(!audit_dummy_context()))
450 __audit_log_capset(new, old);
451}
452
453static inline void audit_mmap_fd(int fd, int flags)
454{
455 if (unlikely(!audit_dummy_context()))
456 __audit_mmap_fd(fd, flags);
457}
458
459extern int audit_n_rules;
460extern int audit_signals;
461#else /* CONFIG_AUDITSYSCALL */
462static inline int audit_alloc(struct task_struct *task)
463{
464 return 0;
465}
466static inline void audit_free(struct task_struct *task)
467{ }
468static inline void audit_syscall_entry(int major, unsigned long a0,
469 unsigned long a1, unsigned long a2,
470 unsigned long a3)
471{ }
472static inline void audit_syscall_exit(void *pt_regs)
473{ }
474static inline bool audit_dummy_context(void)
475{
476 return true;
477}
478static inline struct filename *audit_reusename(const __user char *name)
479{
480 return NULL;
481}
482static inline void audit_getname(struct filename *name)
483{ }
484static inline void __audit_inode(struct filename *name,
485 const struct dentry *dentry,
486 unsigned int flags)
487{ }
488static inline void __audit_inode_child(struct inode *parent,
489 const struct dentry *dentry,
490 const unsigned char type)
491{ }
492static inline void audit_inode(struct filename *name,
493 const struct dentry *dentry,
494 unsigned int parent)
495{ }
496static inline void audit_file(struct file *file)
497{
498}
499static inline void audit_inode_parent_hidden(struct filename *name,
500 const struct dentry *dentry)
501{ }
502static inline void audit_inode_child(struct inode *parent,
503 const struct dentry *dentry,
504 const unsigned char type)
505{ }
506static inline void audit_core_dumps(long signr)
507{ }
508static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
509{ }
510static inline void audit_seccomp(unsigned long syscall, long signr, int code)
511{ }
512static inline int auditsc_get_stamp(struct audit_context *ctx,
513 struct timespec *t, unsigned int *serial)
514{
515 return 0;
516}
517static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
518{
519 return INVALID_UID;
520}
521static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
522{
523 return -1;
524}
525static inline struct tty_struct *audit_get_tty(struct task_struct *tsk)
526{
527 return NULL;
528}
529static inline void audit_put_tty(struct tty_struct *tty)
530{ }
531static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
532{ }
533static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
534 gid_t gid, umode_t mode)
535{ }
536static inline void audit_bprm(struct linux_binprm *bprm)
537{ }
538static inline int audit_socketcall(int nargs, unsigned long *args)
539{
540 return 0;
541}
542static inline void audit_fd_pair(int fd1, int fd2)
543{ }
544static inline int audit_sockaddr(int len, void *addr)
545{
546 return 0;
547}
548static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
549{ }
550static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
551 unsigned int msg_prio,
552 const struct timespec *abs_timeout)
553{ }
554static inline void audit_mq_notify(mqd_t mqdes,
555 const struct sigevent *notification)
556{ }
557static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
558{ }
559static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
560 const struct cred *new,
561 const struct cred *old)
562{
563 return 0;
564}
565static inline void audit_log_capset(const struct cred *new,
566 const struct cred *old)
567{ }
568static inline void audit_mmap_fd(int fd, int flags)
569{ }
570static inline void audit_ptrace(struct task_struct *t)
571{ }
572#define audit_n_rules 0
573#define audit_signals 0
574#endif /* CONFIG_AUDITSYSCALL */
575
576static inline bool audit_loginuid_set(struct task_struct *tsk)
577{
578 return uid_valid(audit_get_loginuid(tsk));
579}
580
581static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
582{
583 audit_log_n_string(ab, buf, strlen(buf));
584}
585
586#endif