1 /* audit.h -- Auditing support
3 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
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.
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.
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
20 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
24 #ifndef _LINUX_AUDIT_H_
25 #define _LINUX_AUDIT_H_
27 #include <linux/sched.h>
28 #include <linux/elf.h>
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)
48 * Messages from 1000-1199 are bi-directional. 1200-1299 & 2100 - 2999 are
49 * exclusively user space. 1300-2099 is kernel --> user space
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 */
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
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 */
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 */
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 */
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 */
98 #define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */
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 */
108 #define AUDIT_NR_FILTERS 6
110 #define AUDIT_FILTER_PREPEND 0x10 /* Prepend to front of list */
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 */
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))
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
132 /* These are useful when checking the
133 * task structure at task creation time
134 * (AUDIT_PER_TASK). */
139 #define AUDIT_FSUID 4
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
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 */
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)
162 #define AUDIT_NEGATE 0x80000000
164 /* These are the supported operators.
175 * 1 1 1 7 all operators
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)
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
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)
229 struct 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 */
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.
244 struct audit_rule_data {
245 __u32 flags; /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */
246 __u32 action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */
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 */
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.
260 struct 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 */
264 __u32 mask[AUDIT_BITMASK_SIZE];
265 __u32 fields[AUDIT_MAX_FIELDS];
266 __u32 values[AUDIT_MAX_FIELDS];
271 struct audit_sig_info {
277 struct audit_context;
279 struct netlink_skb_parms;
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 */
288 extern int audit_alloc(struct task_struct *task);
289 extern void audit_free(struct task_struct *task);
290 extern 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);
293 extern void audit_syscall_exit(struct task_struct *task, int failed, long return_code);
294 extern void audit_getname(const char *name);
295 extern void audit_putname(const char *name);
296 extern void __audit_inode(const char *name, const struct inode *inode, unsigned flags);
297 extern void __audit_inode_child(const char *dname, const struct inode *inode,
299 static inline void audit_inode(const char *name, const struct inode *inode,
301 if (unlikely(current->audit_context))
302 __audit_inode(name, inode, flags);
304 static 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);
311 /* Private API (for audit.c only) */
312 extern unsigned int audit_serial(void);
313 extern void auditsc_get_stamp(struct audit_context *ctx,
314 struct timespec *t, unsigned int *serial);
315 extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid);
316 extern uid_t audit_get_loginuid(struct audit_context *ctx);
317 extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp);
318 extern int audit_socketcall(int nargs, unsigned long *args);
319 extern int audit_sockaddr(int len, void *addr);
320 extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);
321 extern void audit_signal_info(int sig, struct task_struct *t);
322 extern int audit_set_macxattr(const char *name);
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)
345 /* These are defined in audit.c */
347 extern void audit_log(struct audit_context *ctx, gfp_t gfp_mask,
348 int type, const char *fmt, ...)
349 __attribute__((format(printf,4,5)));
351 extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
352 extern void audit_log_format(struct audit_buffer *ab,
353 const char *fmt, ...)
354 __attribute__((format(printf,2,3)));
355 extern void audit_log_end(struct audit_buffer *ab);
356 extern void audit_log_hex(struct audit_buffer *ab,
357 const unsigned char *buf,
359 extern void audit_log_untrustedstring(struct audit_buffer *ab,
361 extern void audit_log_d_path(struct audit_buffer *ab,
363 struct dentry *dentry,
364 struct vfsmount *vfsmnt);
365 /* Private API (for audit.c only) */
366 extern int audit_filter_user(struct netlink_skb_parms *cb, int type);
367 extern int audit_filter_type(int type);
368 extern int audit_receive_filter(int type, int pid, int uid, int seq,
369 void *data, size_t datasz, uid_t loginuid);
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)