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1 | /* audit.h -- Auditing support -*- linux-c -*- |
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 | /* Request and reply types */ | |
28 | #define AUDIT_GET 1000 /* Get status */ | |
29 | #define AUDIT_SET 1001 /* Set status (enable/disable/auditd) */ | |
30 | #define AUDIT_LIST 1002 /* List filtering rules */ | |
31 | #define AUDIT_ADD 1003 /* Add filtering rule */ | |
32 | #define AUDIT_DEL 1004 /* Delete filtering rule */ | |
33 | #define AUDIT_USER 1005 /* Send a message from user-space */ | |
34 | #define AUDIT_LOGIN 1006 /* Define the login id and informaiton */ | |
35 | #define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */ | |
36 | ||
37 | /* Rule flags */ | |
38 | #define AUDIT_PER_TASK 0x01 /* Apply rule at task creation (not syscall) */ | |
39 | #define AUDIT_AT_ENTRY 0x02 /* Apply rule at syscall entry */ | |
40 | #define AUDIT_AT_EXIT 0x04 /* Apply rule at syscall exit */ | |
41 | #define AUDIT_PREPEND 0x10 /* Prepend to front of list */ | |
42 | ||
43 | /* Rule actions */ | |
44 | #define AUDIT_NEVER 0 /* Do not build context if rule matches */ | |
45 | #define AUDIT_POSSIBLE 1 /* Build context if rule matches */ | |
46 | #define AUDIT_ALWAYS 2 /* Generate audit record if rule matches */ | |
47 | ||
48 | /* Rule structure sizes -- if these change, different AUDIT_ADD and | |
49 | * AUDIT_LIST commands must be implemented. */ | |
50 | #define AUDIT_MAX_FIELDS 64 | |
51 | #define AUDIT_BITMASK_SIZE 64 | |
52 | #define AUDIT_WORD(nr) ((__u32)((nr)/32)) | |
53 | #define AUDIT_BIT(nr) (1 << ((nr) - AUDIT_WORD(nr)*32)) | |
54 | ||
55 | /* Rule fields */ | |
56 | /* These are useful when checking the | |
57 | * task structure at task creation time | |
58 | * (AUDIT_PER_TASK). */ | |
59 | #define AUDIT_PID 0 | |
60 | #define AUDIT_UID 1 | |
61 | #define AUDIT_EUID 2 | |
62 | #define AUDIT_SUID 3 | |
63 | #define AUDIT_FSUID 4 | |
64 | #define AUDIT_GID 5 | |
65 | #define AUDIT_EGID 6 | |
66 | #define AUDIT_SGID 7 | |
67 | #define AUDIT_FSGID 8 | |
68 | #define AUDIT_LOGINUID 9 | |
69 | #define AUDIT_PERS 10 | |
70 | ||
71 | /* These are ONLY useful when checking | |
72 | * at syscall exit time (AUDIT_AT_EXIT). */ | |
73 | #define AUDIT_DEVMAJOR 100 | |
74 | #define AUDIT_DEVMINOR 101 | |
75 | #define AUDIT_INODE 102 | |
76 | #define AUDIT_EXIT 103 | |
77 | #define AUDIT_SUCCESS 104 /* exit >= 0; value ignored */ | |
78 | ||
79 | #define AUDIT_ARG0 200 | |
80 | #define AUDIT_ARG1 (AUDIT_ARG0+1) | |
81 | #define AUDIT_ARG2 (AUDIT_ARG0+2) | |
82 | #define AUDIT_ARG3 (AUDIT_ARG0+3) | |
83 | ||
84 | #define AUDIT_NEGATE 0x80000000 | |
85 | ||
86 | ||
87 | /* Status symbols */ | |
88 | /* Mask values */ | |
89 | #define AUDIT_STATUS_ENABLED 0x0001 | |
90 | #define AUDIT_STATUS_FAILURE 0x0002 | |
91 | #define AUDIT_STATUS_PID 0x0004 | |
92 | #define AUDIT_STATUS_RATE_LIMIT 0x0008 | |
93 | #define AUDIT_STATUS_BACKLOG_LIMIT 0x0010 | |
94 | /* Failure-to-log actions */ | |
95 | #define AUDIT_FAIL_SILENT 0 | |
96 | #define AUDIT_FAIL_PRINTK 1 | |
97 | #define AUDIT_FAIL_PANIC 2 | |
98 | ||
99 | #ifndef __KERNEL__ | |
100 | struct audit_message { | |
101 | struct nlmsghdr nlh; | |
102 | char data[1200]; | |
103 | }; | |
104 | #endif | |
105 | ||
106 | struct audit_status { | |
107 | __u32 mask; /* Bit mask for valid entries */ | |
108 | __u32 enabled; /* 1 = enabled, 0 = disbaled */ | |
109 | __u32 failure; /* Failure-to-log action */ | |
110 | __u32 pid; /* pid of auditd process */ | |
111 | __u32 rate_limit; /* messages rate limit (per second) */ | |
112 | __u32 backlog_limit; /* waiting messages limit */ | |
113 | __u32 lost; /* messages lost */ | |
114 | __u32 backlog; /* messages waiting in queue */ | |
115 | }; | |
116 | ||
117 | struct audit_rule { /* for AUDIT_LIST, AUDIT_ADD, and AUDIT_DEL */ | |
118 | __u32 flags; /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */ | |
119 | __u32 action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */ | |
120 | __u32 field_count; | |
121 | __u32 mask[AUDIT_BITMASK_SIZE]; | |
122 | __u32 fields[AUDIT_MAX_FIELDS]; | |
123 | __u32 values[AUDIT_MAX_FIELDS]; | |
124 | }; | |
125 | ||
126 | #ifdef __KERNEL__ | |
127 | ||
128 | struct audit_buffer; | |
129 | struct audit_context; | |
130 | struct inode; | |
131 | ||
132 | #ifdef CONFIG_AUDITSYSCALL | |
133 | /* These are defined in auditsc.c */ | |
134 | /* Public API */ | |
135 | extern int audit_alloc(struct task_struct *task); | |
136 | extern void audit_free(struct task_struct *task); | |
137 | extern void audit_syscall_entry(struct task_struct *task, | |
138 | int major, unsigned long a0, unsigned long a1, | |
139 | unsigned long a2, unsigned long a3); | |
140 | extern void audit_syscall_exit(struct task_struct *task, int return_code); | |
141 | extern void audit_getname(const char *name); | |
142 | extern void audit_putname(const char *name); | |
143 | extern void audit_inode(const char *name, const struct inode *inode); | |
144 | ||
145 | /* Private API (for audit.c only) */ | |
146 | extern int audit_receive_filter(int type, int pid, int uid, int seq, | |
147 | void *data); | |
148 | extern void audit_get_stamp(struct audit_context *ctx, | |
149 | struct timespec *t, int *serial); | |
150 | extern int audit_set_loginuid(struct audit_context *ctx, uid_t loginuid); | |
151 | extern uid_t audit_get_loginuid(struct audit_context *ctx); | |
152 | extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode); | |
153 | #else | |
154 | #define audit_alloc(t) ({ 0; }) | |
155 | #define audit_free(t) do { ; } while (0) | |
156 | #define audit_syscall_entry(t,a,b,c,d,e) do { ; } while (0) | |
157 | #define audit_syscall_exit(t,r) do { ; } while (0) | |
158 | #define audit_getname(n) do { ; } while (0) | |
159 | #define audit_putname(n) do { ; } while (0) | |
160 | #define audit_inode(n,i) do { ; } while (0) | |
161 | #define audit_get_loginuid(c) ({ -1; }) | |
162 | #define audit_ipc_perms(q,u,g,m) ({ 0; }) | |
163 | #endif | |
164 | ||
165 | #ifdef CONFIG_AUDIT | |
166 | /* These are defined in audit.c */ | |
167 | /* Public API */ | |
168 | extern void audit_log(struct audit_context *ctx, | |
169 | const char *fmt, ...) | |
170 | __attribute__((format(printf,2,3))); | |
171 | ||
172 | extern struct audit_buffer *audit_log_start(struct audit_context *ctx); | |
173 | extern void audit_log_format(struct audit_buffer *ab, | |
174 | const char *fmt, ...) | |
175 | __attribute__((format(printf,2,3))); | |
176 | extern void audit_log_end(struct audit_buffer *ab); | |
177 | extern void audit_log_d_path(struct audit_buffer *ab, | |
178 | const char *prefix, | |
179 | struct dentry *dentry, | |
180 | struct vfsmount *vfsmnt); | |
181 | ||
182 | /* Private API (for auditsc.c only) */ | |
183 | extern void audit_send_reply(int pid, int seq, int type, | |
184 | int done, int multi, | |
185 | void *payload, int size); | |
186 | extern void audit_log_lost(const char *message); | |
187 | #else | |
188 | #define audit_log(t,f,...) do { ; } while (0) | |
189 | #define audit_log_start(t) ({ NULL; }) | |
190 | #define audit_log_vformat(b,f,a) do { ; } while (0) | |
191 | #define audit_log_format(b,f,...) do { ; } while (0) | |
192 | #define audit_log_end(b) do { ; } while (0) | |
193 | #define audit_log_d_path(b,p,d,v) do { ; } while (0) | |
194 | #endif | |
195 | #endif | |
196 | #endif |