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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 - 1999 future use
37 * 2000 is for otherwise unclassified kernel audit messages
38 *
39 * Messages from 1000-1199 are bi-directional. 1200-1299 are exclusively user
40 * space. Anything over that is kernel --> user space communication.
41 */
42#define AUDIT_GET 1000 /* Get status */
43#define AUDIT_SET 1001 /* Set status (enable/disable/auditd) */
44#define AUDIT_LIST 1002 /* List syscall filtering rules */
45#define AUDIT_ADD 1003 /* Add syscall filtering rule */
46#define AUDIT_DEL 1004 /* Delete syscall filtering rule */
47#define AUDIT_USER 1005 /* Message from userspace -- deprecated */
48#define AUDIT_LOGIN 1006 /* Define the login id and information */
49#define AUDIT_WATCH_INS 1007 /* Insert file/dir watch entry */
50#define AUDIT_WATCH_REM 1008 /* Remove file/dir watch entry */
51#define AUDIT_WATCH_LIST 1009 /* List all file/dir watches */
52#define AUDIT_SIGNAL_INFO 1010 /* Get info about sender of signal to auditd */
53
54#define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages uninteresting to kernel */
55#define AUDIT_LAST_USER_MSG 1199
56
57#define AUDIT_DAEMON_START 1200 /* Daemon startup record */
58#define AUDIT_DAEMON_END 1201 /* Daemon normal stop record */
59#define AUDIT_DAEMON_ABORT 1202 /* Daemon error stop record */
60#define AUDIT_DAEMON_CONFIG 1203 /* Daemon config change */
61
62#define AUDIT_SYSCALL 1300 /* Syscall event */
63#define AUDIT_FS_WATCH 1301 /* Filesystem watch event */
64#define AUDIT_PATH 1302 /* Filename path information */
65#define AUDIT_IPC 1303 /* IPC record */
66#define AUDIT_SOCKETCALL 1304 /* sys_socketcall arguments */
67#define AUDIT_CONFIG_CHANGE 1305 /* Audit system configuration change */
68#define AUDIT_SOCKADDR 1306 /* sockaddr copied as syscall arg */
69#define AUDIT_CWD 1307 /* Current working directory */
70
71#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
72#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
73#define AUDIT_AVC_PATH 1402 /* dentry, vfsmount pair from avc */
74
75#define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */
76
77/* Rule flags */
78#define AUDIT_PER_TASK 0x01 /* Apply rule at task creation (not syscall) */
79#define AUDIT_AT_ENTRY 0x02 /* Apply rule at syscall entry */
80#define AUDIT_AT_EXIT 0x04 /* Apply rule at syscall exit */
81#define AUDIT_PREPEND 0x10 /* Prepend to front of list */
82
83/* Rule actions */
84#define AUDIT_NEVER 0 /* Do not build context if rule matches */
85#define AUDIT_POSSIBLE 1 /* Build context if rule matches */
86#define AUDIT_ALWAYS 2 /* Generate audit record if rule matches */
87
88/* Rule structure sizes -- if these change, different AUDIT_ADD and
89 * AUDIT_LIST commands must be implemented. */
90#define AUDIT_MAX_FIELDS 64
91#define AUDIT_BITMASK_SIZE 64
92#define AUDIT_WORD(nr) ((__u32)((nr)/32))
93#define AUDIT_BIT(nr) (1 << ((nr) - AUDIT_WORD(nr)*32))
94
95/* Rule fields */
96 /* These are useful when checking the
97 * task structure at task creation time
98 * (AUDIT_PER_TASK). */
99#define AUDIT_PID 0
100#define AUDIT_UID 1
101#define AUDIT_EUID 2
102#define AUDIT_SUID 3
103#define AUDIT_FSUID 4
104#define AUDIT_GID 5
105#define AUDIT_EGID 6
106#define AUDIT_SGID 7
107#define AUDIT_FSGID 8
108#define AUDIT_LOGINUID 9
109#define AUDIT_PERS 10
110#define AUDIT_ARCH 11
111
112 /* These are ONLY useful when checking
113 * at syscall exit time (AUDIT_AT_EXIT). */
114#define AUDIT_DEVMAJOR 100
115#define AUDIT_DEVMINOR 101
116#define AUDIT_INODE 102
117#define AUDIT_EXIT 103
118#define AUDIT_SUCCESS 104 /* exit >= 0; value ignored */
119
120#define AUDIT_ARG0 200
121#define AUDIT_ARG1 (AUDIT_ARG0+1)
122#define AUDIT_ARG2 (AUDIT_ARG0+2)
123#define AUDIT_ARG3 (AUDIT_ARG0+3)
124
125#define AUDIT_NEGATE 0x80000000
126
127
128/* Status symbols */
129 /* Mask values */
130#define AUDIT_STATUS_ENABLED 0x0001
131#define AUDIT_STATUS_FAILURE 0x0002
132#define AUDIT_STATUS_PID 0x0004
133#define AUDIT_STATUS_RATE_LIMIT 0x0008
134#define AUDIT_STATUS_BACKLOG_LIMIT 0x0010
135 /* Failure-to-log actions */
136#define AUDIT_FAIL_SILENT 0
137#define AUDIT_FAIL_PRINTK 1
138#define AUDIT_FAIL_PANIC 2
139
140/* distinguish syscall tables */
141#define __AUDIT_ARCH_64BIT 0x80000000
142#define __AUDIT_ARCH_LE 0x40000000
143#define AUDIT_ARCH_ALPHA (EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
144#define AUDIT_ARCH_ARM (EM_ARM|__AUDIT_ARCH_LE)
145#define AUDIT_ARCH_ARMEB (EM_ARM)
146#define AUDIT_ARCH_CRIS (EM_CRIS|__AUDIT_ARCH_LE)
147#define AUDIT_ARCH_FRV (EM_FRV)
148#define AUDIT_ARCH_H8300 (EM_H8_300)
149#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE)
150#define AUDIT_ARCH_IA64 (EM_IA_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
151#define AUDIT_ARCH_M32R (EM_M32R)
152#define AUDIT_ARCH_M68K (EM_68K)
153#define AUDIT_ARCH_MIPS (EM_MIPS)
154#define AUDIT_ARCH_MIPSEL (EM_MIPS|__AUDIT_ARCH_LE)
155#define AUDIT_ARCH_MIPS64 (EM_MIPS|__AUDIT_ARCH_64BIT)
156#define AUDIT_ARCH_MIPSEL64 (EM_MIPS|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
157#define AUDIT_ARCH_PARISC (EM_PARISC)
158#define AUDIT_ARCH_PARISC64 (EM_PARISC|__AUDIT_ARCH_64BIT)
159#define AUDIT_ARCH_PPC (EM_PPC)
160#define AUDIT_ARCH_PPC64 (EM_PPC64|__AUDIT_ARCH_64BIT)
161#define AUDIT_ARCH_S390 (EM_S390)
162#define AUDIT_ARCH_S390X (EM_S390|__AUDIT_ARCH_64BIT)
163#define AUDIT_ARCH_SH (EM_SH)
164#define AUDIT_ARCH_SHEL (EM_SH|__AUDIT_ARCH_LE)
165#define AUDIT_ARCH_SH64 (EM_SH|__AUDIT_ARCH_64BIT)
166#define AUDIT_ARCH_SHEL64 (EM_SH|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
167#define AUDIT_ARCH_SPARC (EM_SPARC)
168#define AUDIT_ARCH_SPARC64 (EM_SPARCV9|__AUDIT_ARCH_64BIT)
169#define AUDIT_ARCH_V850 (EM_V850|__AUDIT_ARCH_LE)
170#define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
171
172struct audit_status {
173 __u32 mask; /* Bit mask for valid entries */
174 __u32 enabled; /* 1 = enabled, 0 = disabled */
175 __u32 failure; /* Failure-to-log action */
176 __u32 pid; /* pid of auditd process */
177 __u32 rate_limit; /* messages rate limit (per second) */
178 __u32 backlog_limit; /* waiting messages limit */
179 __u32 lost; /* messages lost */
180 __u32 backlog; /* messages waiting in queue */
181};
182
183struct audit_rule { /* for AUDIT_LIST, AUDIT_ADD, and AUDIT_DEL */
184 __u32 flags; /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */
185 __u32 action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */
186 __u32 field_count;
187 __u32 mask[AUDIT_BITMASK_SIZE];
188 __u32 fields[AUDIT_MAX_FIELDS];
189 __u32 values[AUDIT_MAX_FIELDS];
190};
191
192#ifdef __KERNEL__
193
194struct audit_sig_info {
195 uid_t uid;
196 pid_t pid;
197};
198
199struct audit_buffer;
200struct audit_context;
201struct inode;
202
203#define AUDITSC_INVALID 0
204#define AUDITSC_SUCCESS 1
205#define AUDITSC_FAILURE 2
206#define AUDITSC_RESULT(x) ( ((long)(x))<0?AUDITSC_FAILURE:AUDITSC_SUCCESS )
207#ifdef CONFIG_AUDITSYSCALL
208/* These are defined in auditsc.c */
209 /* Public API */
210extern int audit_alloc(struct task_struct *task);
211extern void audit_free(struct task_struct *task);
212extern void audit_syscall_entry(struct task_struct *task, int arch,
213 int major, unsigned long a0, unsigned long a1,
214 unsigned long a2, unsigned long a3);
215extern void audit_syscall_exit(struct task_struct *task, int failed, long return_code);
216extern void audit_getname(const char *name);
217extern void audit_putname(const char *name);
218extern void audit_inode(const char *name, const struct inode *inode);
219
220 /* Private API (for audit.c only) */
221extern int audit_receive_filter(int type, int pid, int uid, int seq,
222 void *data, uid_t loginuid);
223extern unsigned int audit_serial(void);
224extern void auditsc_get_stamp(struct audit_context *ctx,
225 struct timespec *t, unsigned int *serial);
226extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid);
227extern uid_t audit_get_loginuid(struct audit_context *ctx);
228extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
229extern int audit_socketcall(int nargs, unsigned long *args);
230extern int audit_sockaddr(int len, void *addr);
231extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);
232extern void audit_signal_info(int sig, struct task_struct *t);
233#else
234#define audit_alloc(t) ({ 0; })
235#define audit_free(t) do { ; } while (0)
236#define audit_syscall_entry(t,ta,a,b,c,d,e) do { ; } while (0)
237#define audit_syscall_exit(t,f,r) do { ; } while (0)
238#define audit_getname(n) do { ; } while (0)
239#define audit_putname(n) do { ; } while (0)
240#define audit_inode(n,i) do { ; } while (0)
241#define audit_receive_filter(t,p,u,s,d,l) ({ -EOPNOTSUPP; })
242#define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
243#define audit_get_loginuid(c) ({ -1; })
244#define audit_ipc_perms(q,u,g,m) ({ 0; })
245#define audit_socketcall(n,a) ({ 0; })
246#define audit_sockaddr(len, addr) ({ 0; })
247#define audit_avc_path(dentry, mnt) ({ 0; })
248#define audit_signal_info(s,t) do { ; } while (0)
249#endif
250
251#ifdef CONFIG_AUDIT
252/* These are defined in audit.c */
253 /* Public API */
254extern void audit_log(struct audit_context *ctx, int type,
255 const char *fmt, ...)
256 __attribute__((format(printf,3,4)));
257
258extern struct audit_buffer *audit_log_start(struct audit_context *ctx,int type);
259extern void audit_log_format(struct audit_buffer *ab,
260 const char *fmt, ...)
261 __attribute__((format(printf,2,3)));
262extern void audit_log_end(struct audit_buffer *ab);
263extern void audit_log_hex(struct audit_buffer *ab,
264 const unsigned char *buf,
265 size_t len);
266extern void audit_log_untrustedstring(struct audit_buffer *ab,
267 const char *string);
268extern void audit_log_d_path(struct audit_buffer *ab,
269 const char *prefix,
270 struct dentry *dentry,
271 struct vfsmount *vfsmnt);
272 /* Private API (for auditsc.c only) */
273extern void audit_send_reply(int pid, int seq, int type,
274 int done, int multi,
275 void *payload, int size);
276extern void audit_log_lost(const char *message);
277#else
278#define audit_log(c,t,f,...) do { ; } while (0)
279#define audit_log_start(c,t) ({ NULL; })
280#define audit_log_vformat(b,f,a) do { ; } while (0)
281#define audit_log_format(b,f,...) do { ; } while (0)
282#define audit_log_end(b) do { ; } while (0)
283#define audit_log_hex(a,b,l) do { ; } while (0)
284#define audit_log_untrustedstring(a,s) do { ; } while (0)
285#define audit_log_d_path(b,p,d,v) do { ; } while (0)
286#endif
287#endif
288#endif