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