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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
24#ifndef _LINUX_AUDIT_H_
25#define _LINUX_AUDIT_H_
26
27#include <linux/elf-em.h>
28
29/* The netlink messages for the audit system is divided into blocks:
30 * 1000 - 1099 are for commanding the audit system
31 * 1100 - 1199 user space trusted application messages
32 * 1200 - 1299 messages internal to the audit daemon
33 * 1300 - 1399 audit event messages
34 * 1400 - 1499 SE Linux use
35 * 1500 - 1599 kernel LSPP events
36 * 1600 - 1699 kernel crypto events
37 * 1700 - 1799 kernel anomaly records
38 * 1800 - 1999 future kernel use (maybe integrity labels and related events)
39 * 2000 is for otherwise unclassified kernel audit messages (legacy)
40 * 2001 - 2099 unused (kernel)
41 * 2100 - 2199 user space anomaly records
42 * 2200 - 2299 user space actions taken in response to anomalies
43 * 2300 - 2399 user space generated LSPP events
44 * 2400 - 2499 user space crypto events
45 * 2500 - 2999 future user space (maybe integrity labels and related events)
46 *
47 * Messages from 1000-1199 are bi-directional. 1200-1299 & 2100 - 2999 are
48 * exclusively user space. 1300-2099 is kernel --> user space
49 * communication.
50 */
51#define AUDIT_GET 1000 /* Get status */
52#define AUDIT_SET 1001 /* Set status (enable/disable/auditd) */
53#define AUDIT_LIST 1002 /* List syscall rules -- deprecated */
54#define AUDIT_ADD 1003 /* Add syscall rule -- deprecated */
55#define AUDIT_DEL 1004 /* Delete syscall rule -- deprecated */
56#define AUDIT_USER 1005 /* Message from userspace -- deprecated */
57#define AUDIT_LOGIN 1006 /* Define the login id and information */
58#define AUDIT_WATCH_INS 1007 /* Insert file/dir watch entry */
59#define AUDIT_WATCH_REM 1008 /* Remove file/dir watch entry */
60#define AUDIT_WATCH_LIST 1009 /* List all file/dir watches */
61#define AUDIT_SIGNAL_INFO 1010 /* Get info about sender of signal to auditd */
62#define AUDIT_ADD_RULE 1011 /* Add syscall filtering rule */
63#define AUDIT_DEL_RULE 1012 /* Delete syscall filtering rule */
64#define AUDIT_LIST_RULES 1013 /* List syscall filtering rules */
65
66#define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages mostly uninteresting to kernel */
67#define AUDIT_USER_AVC 1107 /* We filter this differently */
68#define AUDIT_LAST_USER_MSG 1199
69#define AUDIT_FIRST_USER_MSG2 2100 /* More user space messages */
70#define AUDIT_LAST_USER_MSG2 2999
71
72#define AUDIT_DAEMON_START 1200 /* Daemon startup record */
73#define AUDIT_DAEMON_END 1201 /* Daemon normal stop record */
74#define AUDIT_DAEMON_ABORT 1202 /* Daemon error stop record */
75#define AUDIT_DAEMON_CONFIG 1203 /* Daemon config change */
76
77#define AUDIT_SYSCALL 1300 /* Syscall event */
78#define AUDIT_FS_WATCH 1301 /* Filesystem watch event */
79#define AUDIT_PATH 1302 /* Filename path information */
80#define AUDIT_IPC 1303 /* IPC record */
81#define AUDIT_SOCKETCALL 1304 /* sys_socketcall arguments */
82#define AUDIT_CONFIG_CHANGE 1305 /* Audit system configuration change */
83#define AUDIT_SOCKADDR 1306 /* sockaddr copied as syscall arg */
84#define AUDIT_CWD 1307 /* Current working directory */
85#define AUDIT_EXECVE 1309 /* execve arguments */
86#define AUDIT_IPC_SET_PERM 1311 /* IPC new permissions record type */
87#define AUDIT_MQ_OPEN 1312 /* POSIX MQ open record type */
88#define AUDIT_MQ_SENDRECV 1313 /* POSIX MQ send/receive record type */
89#define AUDIT_MQ_NOTIFY 1314 /* POSIX MQ notify record type */
90#define AUDIT_MQ_GETSETATTR 1315 /* POSIX MQ get/set attribute record type */
91
92#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
93#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
94#define AUDIT_AVC_PATH 1402 /* dentry, vfsmount pair from avc */
95#define AUDIT_MAC_POLICY_LOAD 1403 /* Policy file load */
96#define AUDIT_MAC_STATUS 1404 /* Changed enforcing,permissive,off */
97#define AUDIT_MAC_CONFIG_CHANGE 1405 /* Changes to booleans */
98
99#define AUDIT_FIRST_KERN_ANOM_MSG 1700
100#define AUDIT_LAST_KERN_ANOM_MSG 1799
101#define AUDIT_ANOM_PROMISCUOUS 1700 /* Device changed promiscuous mode */
102
103#define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */
104
105/* Rule flags */
106#define AUDIT_FILTER_USER 0x00 /* Apply rule to user-generated messages */
107#define AUDIT_FILTER_TASK 0x01 /* Apply rule at task creation (not syscall) */
108#define AUDIT_FILTER_ENTRY 0x02 /* Apply rule at syscall entry */
109#define AUDIT_FILTER_WATCH 0x03 /* Apply rule to file system watches */
110#define AUDIT_FILTER_EXIT 0x04 /* Apply rule at syscall exit */
111#define AUDIT_FILTER_TYPE 0x05 /* Apply rule at audit_log_start */
112
113#define AUDIT_NR_FILTERS 6
114
115#define AUDIT_FILTER_PREPEND 0x10 /* Prepend to front of list */
116
117/* Rule actions */
118#define AUDIT_NEVER 0 /* Do not build context if rule matches */
119#define AUDIT_POSSIBLE 1 /* Build context if rule matches */
120#define AUDIT_ALWAYS 2 /* Generate audit record if rule matches */
121
122/* Rule structure sizes -- if these change, different AUDIT_ADD and
123 * AUDIT_LIST commands must be implemented. */
124#define AUDIT_MAX_FIELDS 64
125#define AUDIT_BITMASK_SIZE 64
126#define AUDIT_WORD(nr) ((__u32)((nr)/32))
127#define AUDIT_BIT(nr) (1 << ((nr) - AUDIT_WORD(nr)*32))
128
129/* This bitmask is used to validate user input. It represents all bits that
130 * are currently used in an audit field constant understood by the kernel.
131 * If you are adding a new #define AUDIT_<whatever>, please ensure that
132 * AUDIT_UNUSED_BITS is updated if need be. */
133#define AUDIT_UNUSED_BITS 0x0FFFFC00
134
135
136/* Rule fields */
137 /* These are useful when checking the
138 * task structure at task creation time
139 * (AUDIT_PER_TASK). */
140#define AUDIT_PID 0
141#define AUDIT_UID 1
142#define AUDIT_EUID 2
143#define AUDIT_SUID 3
144#define AUDIT_FSUID 4
145#define AUDIT_GID 5
146#define AUDIT_EGID 6
147#define AUDIT_SGID 7
148#define AUDIT_FSGID 8
149#define AUDIT_LOGINUID 9
150#define AUDIT_PERS 10
151#define AUDIT_ARCH 11
152#define AUDIT_MSGTYPE 12
153#define AUDIT_SE_USER 13 /* security label user */
154#define AUDIT_SE_ROLE 14 /* security label role */
155#define AUDIT_SE_TYPE 15 /* security label type */
156#define AUDIT_SE_SEN 16 /* security label sensitivity label */
157#define AUDIT_SE_CLR 17 /* security label clearance label */
158#define AUDIT_PPID 18
159
160 /* These are ONLY useful when checking
161 * at syscall exit time (AUDIT_AT_EXIT). */
162#define AUDIT_DEVMAJOR 100
163#define AUDIT_DEVMINOR 101
164#define AUDIT_INODE 102
165#define AUDIT_EXIT 103
166#define AUDIT_SUCCESS 104 /* exit >= 0; value ignored */
167#define AUDIT_WATCH 105
168
169#define AUDIT_ARG0 200
170#define AUDIT_ARG1 (AUDIT_ARG0+1)
171#define AUDIT_ARG2 (AUDIT_ARG0+2)
172#define AUDIT_ARG3 (AUDIT_ARG0+3)
173
174#define AUDIT_NEGATE 0x80000000
175
176/* These are the supported operators.
177 * 4 2 1
178 * = > <
179 * -------
180 * 0 0 0 0 nonsense
181 * 0 0 1 1 <
182 * 0 1 0 2 >
183 * 0 1 1 3 !=
184 * 1 0 0 4 =
185 * 1 0 1 5 <=
186 * 1 1 0 6 >=
187 * 1 1 1 7 all operators
188 */
189#define AUDIT_LESS_THAN 0x10000000
190#define AUDIT_GREATER_THAN 0x20000000
191#define AUDIT_NOT_EQUAL 0x30000000
192#define AUDIT_EQUAL 0x40000000
193#define AUDIT_LESS_THAN_OR_EQUAL (AUDIT_LESS_THAN|AUDIT_EQUAL)
194#define AUDIT_GREATER_THAN_OR_EQUAL (AUDIT_GREATER_THAN|AUDIT_EQUAL)
195#define AUDIT_OPERATORS (AUDIT_EQUAL|AUDIT_NOT_EQUAL)
196
197/* Status symbols */
198 /* Mask values */
199#define AUDIT_STATUS_ENABLED 0x0001
200#define AUDIT_STATUS_FAILURE 0x0002
201#define AUDIT_STATUS_PID 0x0004
202#define AUDIT_STATUS_RATE_LIMIT 0x0008
203#define AUDIT_STATUS_BACKLOG_LIMIT 0x0010
204 /* Failure-to-log actions */
205#define AUDIT_FAIL_SILENT 0
206#define AUDIT_FAIL_PRINTK 1
207#define AUDIT_FAIL_PANIC 2
208
209/* distinguish syscall tables */
210#define __AUDIT_ARCH_64BIT 0x80000000
211#define __AUDIT_ARCH_LE 0x40000000
212#define AUDIT_ARCH_ALPHA (EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
213#define AUDIT_ARCH_ARM (EM_ARM|__AUDIT_ARCH_LE)
214#define AUDIT_ARCH_ARMEB (EM_ARM)
215#define AUDIT_ARCH_CRIS (EM_CRIS|__AUDIT_ARCH_LE)
216#define AUDIT_ARCH_FRV (EM_FRV)
217#define AUDIT_ARCH_H8300 (EM_H8_300)
218#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE)
219#define AUDIT_ARCH_IA64 (EM_IA_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
220#define AUDIT_ARCH_M32R (EM_M32R)
221#define AUDIT_ARCH_M68K (EM_68K)
222#define AUDIT_ARCH_MIPS (EM_MIPS)
223#define AUDIT_ARCH_MIPSEL (EM_MIPS|__AUDIT_ARCH_LE)
224#define AUDIT_ARCH_MIPS64 (EM_MIPS|__AUDIT_ARCH_64BIT)
225#define AUDIT_ARCH_MIPSEL64 (EM_MIPS|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
226#define AUDIT_ARCH_PARISC (EM_PARISC)
227#define AUDIT_ARCH_PARISC64 (EM_PARISC|__AUDIT_ARCH_64BIT)
228#define AUDIT_ARCH_PPC (EM_PPC)
229#define AUDIT_ARCH_PPC64 (EM_PPC64|__AUDIT_ARCH_64BIT)
230#define AUDIT_ARCH_S390 (EM_S390)
231#define AUDIT_ARCH_S390X (EM_S390|__AUDIT_ARCH_64BIT)
232#define AUDIT_ARCH_SH (EM_SH)
233#define AUDIT_ARCH_SHEL (EM_SH|__AUDIT_ARCH_LE)
234#define AUDIT_ARCH_SH64 (EM_SH|__AUDIT_ARCH_64BIT)
235#define AUDIT_ARCH_SHEL64 (EM_SH|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
236#define AUDIT_ARCH_SPARC (EM_SPARC)
237#define AUDIT_ARCH_SPARC64 (EM_SPARCV9|__AUDIT_ARCH_64BIT)
238#define AUDIT_ARCH_V850 (EM_V850|__AUDIT_ARCH_LE)
239#define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
240
241struct audit_status {
242 __u32 mask; /* Bit mask for valid entries */
243 __u32 enabled; /* 1 = enabled, 0 = disabled */
244 __u32 failure; /* Failure-to-log action */
245 __u32 pid; /* pid of auditd process */
246 __u32 rate_limit; /* messages rate limit (per second) */
247 __u32 backlog_limit; /* waiting messages limit */
248 __u32 lost; /* messages lost */
249 __u32 backlog; /* messages waiting in queue */
250};
251
252/* audit_rule_data supports filter rules with both integer and string
253 * fields. It corresponds with AUDIT_ADD_RULE, AUDIT_DEL_RULE and
254 * AUDIT_LIST_RULES requests.
255 */
256struct audit_rule_data {
257 __u32 flags; /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */
258 __u32 action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */
259 __u32 field_count;
260 __u32 mask[AUDIT_BITMASK_SIZE]; /* syscall(s) affected */
261 __u32 fields[AUDIT_MAX_FIELDS];
262 __u32 values[AUDIT_MAX_FIELDS];
263 __u32 fieldflags[AUDIT_MAX_FIELDS];
264 __u32 buflen; /* total length of string fields */
265 char buf[0]; /* string fields buffer */
266};
267
268/* audit_rule is supported to maintain backward compatibility with
269 * userspace. It supports integer fields only and corresponds to
270 * AUDIT_ADD, AUDIT_DEL and AUDIT_LIST requests.
271 */
272struct audit_rule { /* for AUDIT_LIST, AUDIT_ADD, and AUDIT_DEL */
273 __u32 flags; /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */
274 __u32 action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */
275 __u32 field_count;
276 __u32 mask[AUDIT_BITMASK_SIZE];
277 __u32 fields[AUDIT_MAX_FIELDS];
278 __u32 values[AUDIT_MAX_FIELDS];
279};
280
281#ifdef __KERNEL__
282#include <linux/sched.h>
283
284struct audit_sig_info {
285 uid_t uid;
286 pid_t pid;
287 char ctx[0];
288};
289
290struct audit_buffer;
291struct audit_context;
292struct inode;
293struct netlink_skb_parms;
294struct linux_binprm;
295struct mq_attr;
296struct mqstat;
297
298#define AUDITSC_INVALID 0
299#define AUDITSC_SUCCESS 1
300#define AUDITSC_FAILURE 2
301#define AUDITSC_RESULT(x) ( ((long)(x))<0?AUDITSC_FAILURE:AUDITSC_SUCCESS )
302#ifdef CONFIG_AUDITSYSCALL
303/* These are defined in auditsc.c */
304 /* Public API */
305extern int audit_alloc(struct task_struct *task);
306extern void audit_free(struct task_struct *task);
307extern void audit_syscall_entry(int arch,
308 int major, unsigned long a0, unsigned long a1,
309 unsigned long a2, unsigned long a3);
310extern void audit_syscall_exit(int failed, long return_code);
311extern void __audit_getname(const char *name);
312extern void audit_putname(const char *name);
313extern void __audit_inode(const char *name, const struct inode *inode);
314extern void __audit_inode_child(const char *dname, const struct inode *inode,
315 unsigned long pino);
316static inline void audit_getname(const char *name)
317{
318 if (unlikely(current->audit_context))
319 __audit_getname(name);
320}
321static inline void audit_inode(const char *name, const struct inode *inode) {
322 if (unlikely(current->audit_context))
323 __audit_inode(name, inode);
324}
325static inline void audit_inode_child(const char *dname,
326 const struct inode *inode,
327 unsigned long pino) {
328 if (unlikely(current->audit_context))
329 __audit_inode_child(dname, inode, pino);
330}
331
332 /* Private API (for audit.c only) */
333extern unsigned int audit_serial(void);
334extern void auditsc_get_stamp(struct audit_context *ctx,
335 struct timespec *t, unsigned int *serial);
336extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid);
337extern uid_t audit_get_loginuid(struct audit_context *ctx);
338extern int __audit_ipc_obj(struct kern_ipc_perm *ipcp);
339extern int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
340extern int audit_bprm(struct linux_binprm *bprm);
341extern int audit_socketcall(int nargs, unsigned long *args);
342extern int audit_sockaddr(int len, void *addr);
343extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);
344extern int audit_set_macxattr(const char *name);
345extern int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr);
346extern int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec __user *u_abs_timeout);
347extern int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, unsigned int __user *u_msg_prio, const struct timespec __user *u_abs_timeout);
348extern int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification);
349extern int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
350
351static inline int audit_ipc_obj(struct kern_ipc_perm *ipcp)
352{
353 if (unlikely(current->audit_context))
354 return __audit_ipc_obj(ipcp);
355 return 0;
356}
357static inline int audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)
358{
359 if (unlikely(current->audit_context))
360 return __audit_ipc_set_perm(qbytes, uid, gid, mode);
361 return 0;
362}
363static inline int audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr)
364{
365 if (unlikely(current->audit_context))
366 return __audit_mq_open(oflag, mode, u_attr);
367 return 0;
368}
369static inline int audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec __user *u_abs_timeout)
370{
371 if (unlikely(current->audit_context))
372 return __audit_mq_timedsend(mqdes, msg_len, msg_prio, u_abs_timeout);
373 return 0;
374}
375static inline int audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, unsigned int __user *u_msg_prio, const struct timespec __user *u_abs_timeout)
376{
377 if (unlikely(current->audit_context))
378 return __audit_mq_timedreceive(mqdes, msg_len, u_msg_prio, u_abs_timeout);
379 return 0;
380}
381static inline int audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification)
382{
383 if (unlikely(current->audit_context))
384 return __audit_mq_notify(mqdes, u_notification);
385 return 0;
386}
387static inline int audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
388{
389 if (unlikely(current->audit_context))
390 return __audit_mq_getsetattr(mqdes, mqstat);
391 return 0;
392}
393#else
394#define audit_alloc(t) ({ 0; })
395#define audit_free(t) do { ; } while (0)
396#define audit_syscall_entry(ta,a,b,c,d,e) do { ; } while (0)
397#define audit_syscall_exit(f,r) do { ; } while (0)
398#define audit_getname(n) do { ; } while (0)
399#define audit_putname(n) do { ; } while (0)
400#define __audit_inode(n,i) do { ; } while (0)
401#define __audit_inode_child(d,i,p) do { ; } while (0)
402#define audit_inode(n,i) do { ; } while (0)
403#define audit_inode_child(d,i,p) do { ; } while (0)
404#define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
405#define audit_get_loginuid(c) ({ -1; })
406#define audit_ipc_obj(i) ({ 0; })
407#define audit_ipc_set_perm(q,u,g,m) ({ 0; })
408#define audit_bprm(p) ({ 0; })
409#define audit_socketcall(n,a) ({ 0; })
410#define audit_sockaddr(len, addr) ({ 0; })
411#define audit_avc_path(dentry, mnt) ({ 0; })
412#define audit_set_macxattr(n) do { ; } while (0)
413#define audit_mq_open(o,m,a) ({ 0; })
414#define audit_mq_timedsend(d,l,p,t) ({ 0; })
415#define audit_mq_timedreceive(d,l,p,t) ({ 0; })
416#define audit_mq_notify(d,n) ({ 0; })
417#define audit_mq_getsetattr(d,s) ({ 0; })
418#endif
419
420#ifdef CONFIG_AUDIT
421/* These are defined in audit.c */
422 /* Public API */
423extern void audit_log(struct audit_context *ctx, gfp_t gfp_mask,
424 int type, const char *fmt, ...)
425 __attribute__((format(printf,4,5)));
426
427extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
428extern void audit_log_format(struct audit_buffer *ab,
429 const char *fmt, ...)
430 __attribute__((format(printf,2,3)));
431extern void audit_log_end(struct audit_buffer *ab);
432extern void audit_log_hex(struct audit_buffer *ab,
433 const unsigned char *buf,
434 size_t len);
435extern const char * audit_log_untrustedstring(struct audit_buffer *ab,
436 const char *string);
437extern const char * audit_log_n_untrustedstring(struct audit_buffer *ab,
438 size_t n,
439 const char *string);
440extern void audit_log_d_path(struct audit_buffer *ab,
441 const char *prefix,
442 struct dentry *dentry,
443 struct vfsmount *vfsmnt);
444 /* Private API (for audit.c only) */
445extern int audit_filter_user(struct netlink_skb_parms *cb, int type);
446extern int audit_filter_type(int type);
447extern int audit_receive_filter(int type, int pid, int uid, int seq,
448 void *data, size_t datasz, uid_t loginuid, u32 sid);
449#else
450#define audit_log(c,g,t,f,...) do { ; } while (0)
451#define audit_log_start(c,g,t) ({ NULL; })
452#define audit_log_vformat(b,f,a) do { ; } while (0)
453#define audit_log_format(b,f,...) do { ; } while (0)
454#define audit_log_end(b) do { ; } while (0)
455#define audit_log_hex(a,b,l) do { ; } while (0)
456#define audit_log_untrustedstring(a,s) do { ; } while (0)
457#define audit_log_n_untrustedstring(a,n,s) do { ; } while (0)
458#define audit_log_d_path(b,p,d,v) do { ; } while (0)
459#endif
460#endif
461#endif