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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/* Request and reply types */
31#define AUDIT_GET 1000 /* Get status */
32#define AUDIT_SET 1001 /* Set status (enable/disable/auditd) */
33#define AUDIT_LIST 1002 /* List filtering rules */
34#define AUDIT_ADD 1003 /* Add filtering rule */
35#define AUDIT_DEL 1004 /* Delete filtering rule */
36#define AUDIT_USER 1005 /* Send a message from user-space */
37#define AUDIT_LOGIN 1006 /* Define the login id and informaiton */
38#define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */
39
40/* Rule flags */
41#define AUDIT_PER_TASK 0x01 /* Apply rule at task creation (not syscall) */
42#define AUDIT_AT_ENTRY 0x02 /* Apply rule at syscall entry */
43#define AUDIT_AT_EXIT 0x04 /* Apply rule at syscall exit */
44#define AUDIT_PREPEND 0x10 /* Prepend to front of list */
45
46/* Rule actions */
47#define AUDIT_NEVER 0 /* Do not build context if rule matches */
48#define AUDIT_POSSIBLE 1 /* Build context if rule matches */
49#define AUDIT_ALWAYS 2 /* Generate audit record if rule matches */
50
51/* Rule structure sizes -- if these change, different AUDIT_ADD and
52 * AUDIT_LIST commands must be implemented. */
53#define AUDIT_MAX_FIELDS 64
54#define AUDIT_BITMASK_SIZE 64
55#define AUDIT_WORD(nr) ((__u32)((nr)/32))
56#define AUDIT_BIT(nr) (1 << ((nr) - AUDIT_WORD(nr)*32))
57
58/* Rule fields */
59 /* These are useful when checking the
60 * task structure at task creation time
61 * (AUDIT_PER_TASK). */
62#define AUDIT_PID 0
63#define AUDIT_UID 1
64#define AUDIT_EUID 2
65#define AUDIT_SUID 3
66#define AUDIT_FSUID 4
67#define AUDIT_GID 5
68#define AUDIT_EGID 6
69#define AUDIT_SGID 7
70#define AUDIT_FSGID 8
71#define AUDIT_LOGINUID 9
72#define AUDIT_PERS 10
73#define AUDIT_ARCH 11
74
75 /* These are ONLY useful when checking
76 * at syscall exit time (AUDIT_AT_EXIT). */
77#define AUDIT_DEVMAJOR 100
78#define AUDIT_DEVMINOR 101
79#define AUDIT_INODE 102
80#define AUDIT_EXIT 103
81#define AUDIT_SUCCESS 104 /* exit >= 0; value ignored */
82
83#define AUDIT_ARG0 200
84#define AUDIT_ARG1 (AUDIT_ARG0+1)
85#define AUDIT_ARG2 (AUDIT_ARG0+2)
86#define AUDIT_ARG3 (AUDIT_ARG0+3)
87
88#define AUDIT_NEGATE 0x80000000
89
90
91/* Status symbols */
92 /* Mask values */
93#define AUDIT_STATUS_ENABLED 0x0001
94#define AUDIT_STATUS_FAILURE 0x0002
95#define AUDIT_STATUS_PID 0x0004
96#define AUDIT_STATUS_RATE_LIMIT 0x0008
97#define AUDIT_STATUS_BACKLOG_LIMIT 0x0010
98 /* Failure-to-log actions */
99#define AUDIT_FAIL_SILENT 0
100#define AUDIT_FAIL_PRINTK 1
101#define AUDIT_FAIL_PANIC 2
102
103/* distinguish syscall tables */
104#define __AUDIT_ARCH_64BIT 0x80000000
105#define __AUDIT_ARCH_LE 0x40000000
106#define AUDIT_ARCH_ALPHA (EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
107#define AUDIT_ARCH_ARM (EM_ARM|__AUDIT_ARCH_LE)
108#define AUDIT_ARCH_ARMEB (EM_ARM)
109#define AUDIT_ARCH_CRIS (EM_CRIS|__AUDIT_ARCH_LE)
110#define AUDIT_ARCH_FRV (EM_FRV)
111#define AUDIT_ARCH_H8300 (EM_H8_300)
112#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE)
113#define AUDIT_ARCH_IA64 (EM_IA_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
114#define AUDIT_ARCH_M32R (EM_M32R)
115#define AUDIT_ARCH_M68K (EM_68K)
116#define AUDIT_ARCH_MIPS (EM_MIPS)
117#define AUDIT_ARCH_MIPSEL (EM_MIPS|__AUDIT_ARCH_LE)
118#define AUDIT_ARCH_MIPS64 (EM_MIPS|__AUDIT_ARCH_64BIT)
119#define AUDIT_ARCH_MIPSEL64 (EM_MIPS|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
120#define AUDIT_ARCH_PARISC (EM_PARISC)
121#define AUDIT_ARCH_PARISC64 (EM_PARISC|__AUDIT_ARCH_64BIT)
122#define AUDIT_ARCH_PPC (EM_PPC)
123#define AUDIT_ARCH_PPC64 (EM_PPC64|__AUDIT_ARCH_64BIT)
124#define AUDIT_ARCH_S390 (EM_S390)
125#define AUDIT_ARCH_S390X (EM_S390|__AUDIT_ARCH_64BIT)
126#define AUDIT_ARCH_SH (EM_SH)
127#define AUDIT_ARCH_SHEL (EM_SH|__AUDIT_ARCH_LE)
128#define AUDIT_ARCH_SH64 (EM_SH|__AUDIT_ARCH_64BIT)
129#define AUDIT_ARCH_SHEL64 (EM_SH|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
130#define AUDIT_ARCH_SPARC (EM_SPARC)
131#define AUDIT_ARCH_SPARC64 (EM_SPARC64|__AUDIT_ARCH_64BIT)
132#define AUDIT_ARCH_V850 (EM_V850|__AUDIT_ARCH_LE)
133#define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
134
135#ifndef __KERNEL__
136struct audit_message {
137 struct nlmsghdr nlh;
138 char data[1200];
139};
140#endif
141
142struct audit_status {
143 __u32 mask; /* Bit mask for valid entries */
144 __u32 enabled; /* 1 = enabled, 0 = disbaled */
145 __u32 failure; /* Failure-to-log action */
146 __u32 pid; /* pid of auditd process */
147 __u32 rate_limit; /* messages rate limit (per second) */
148 __u32 backlog_limit; /* waiting messages limit */
149 __u32 lost; /* messages lost */
150 __u32 backlog; /* messages waiting in queue */
151};
152
153struct audit_rule { /* for AUDIT_LIST, AUDIT_ADD, and AUDIT_DEL */
154 __u32 flags; /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */
155 __u32 action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */
156 __u32 field_count;
157 __u32 mask[AUDIT_BITMASK_SIZE];
158 __u32 fields[AUDIT_MAX_FIELDS];
159 __u32 values[AUDIT_MAX_FIELDS];
160};
161
162#ifdef __KERNEL__
163
164struct audit_buffer;
165struct audit_context;
166struct inode;
167
168#define AUDITSC_INVALID 0
169#define AUDITSC_SUCCESS 1
170#define AUDITSC_FAILURE 2
171#define AUDITSC_RESULT(x) ( ((long)(x))<0?AUDITSC_FAILURE:AUDITSC_SUCCESS )
172#ifdef CONFIG_AUDITSYSCALL
173/* These are defined in auditsc.c */
174 /* Public API */
175extern int audit_alloc(struct task_struct *task);
176extern void audit_free(struct task_struct *task);
177extern void audit_syscall_entry(struct task_struct *task, int arch,
178 int major, unsigned long a0, unsigned long a1,
179 unsigned long a2, unsigned long a3);
180extern void audit_syscall_exit(struct task_struct *task, int failed, long return_code);
181extern void audit_getname(const char *name);
182extern void audit_putname(const char *name);
183extern void audit_inode(const char *name, const struct inode *inode);
184
185 /* Private API (for audit.c only) */
186extern int audit_receive_filter(int type, int pid, int uid, int seq,
187 void *data, uid_t loginuid);
188extern void audit_get_stamp(struct audit_context *ctx,
189 struct timespec *t, unsigned int *serial);
190extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid);
191extern uid_t audit_get_loginuid(struct audit_context *ctx);
192extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
193#else
194#define audit_alloc(t) ({ 0; })
195#define audit_free(t) do { ; } while (0)
196#define audit_syscall_entry(t,ta,a,b,c,d,e) do { ; } while (0)
197#define audit_syscall_exit(t,f,r) do { ; } while (0)
198#define audit_getname(n) do { ; } while (0)
199#define audit_putname(n) do { ; } while (0)
200#define audit_inode(n,i) do { ; } while (0)
201#define audit_get_loginuid(c) ({ -1; })
202#define audit_ipc_perms(q,u,g,m) ({ 0; })
203#endif
204
205#ifdef CONFIG_AUDIT
206/* These are defined in audit.c */
207 /* Public API */
208extern void audit_log(struct audit_context *ctx,
209 const char *fmt, ...)
210 __attribute__((format(printf,2,3)));
211
212extern struct audit_buffer *audit_log_start(struct audit_context *ctx);
213extern void audit_log_format(struct audit_buffer *ab,
214 const char *fmt, ...)
215 __attribute__((format(printf,2,3)));
216extern void audit_log_end(struct audit_buffer *ab);
217extern void audit_log_hex(struct audit_buffer *ab,
218 const unsigned char *buf,
219 size_t len);
220extern void audit_log_untrustedstring(struct audit_buffer *ab,
221 const char *string);
222extern void audit_log_d_path(struct audit_buffer *ab,
223 const char *prefix,
224 struct dentry *dentry,
225 struct vfsmount *vfsmnt);
226 /* Private API (for auditsc.c only) */
227extern void audit_send_reply(int pid, int seq, int type,
228 int done, int multi,
229 void *payload, int size);
230extern void audit_log_lost(const char *message);
231#else
232#define audit_log(t,f,...) do { ; } while (0)
233#define audit_log_start(t) ({ NULL; })
234#define audit_log_vformat(b,f,a) do { ; } while (0)
235#define audit_log_format(b,f,...) do { ; } while (0)
236#define audit_log_end(b) do { ; } while (0)
237#define audit_log_hex(a,b,l) do { ; } while (0)
238#define audit_log_untrustedstring(a,s) do { ; } while (0)
239#define audit_log_d_path(b,p,d,v) do { ; } while (0)
240#endif
241#endif
242#endif