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