include/linux/audit.h

   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_login {
 118         __u32           loginuid;
 119         int             msglen;
 120         char            msg[1024];
 121 };
 122
 123 struct audit_rule {             /* for AUDIT_LIST, AUDIT_ADD, and AUDIT_DEL */
 124         __u32           flags;  /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */
 125         __u32           action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */
 126         __u32           field_count;
 127         __u32           mask[AUDIT_BITMASK_SIZE];
 128         __u32           fields[AUDIT_MAX_FIELDS];
 129         __u32           values[AUDIT_MAX_FIELDS];
 130 };
 131
 132 #ifdef __KERNEL__
 133
 134 #ifdef CONFIG_AUDIT
 135 struct audit_buffer;
 136 struct audit_context;
 137 #endif
 138
 139 #ifdef CONFIG_AUDITSYSCALL
 140 /* These are defined in auditsc.c */
 141                                 /* Public API */
 142 extern int  audit_alloc(struct task_struct *task);
 143 extern void audit_free(struct task_struct *task);
 144 extern void audit_syscall_entry(struct task_struct *task,
 145                                 int major, unsigned long a0, unsigned long a1,
 146                                 unsigned long a2, unsigned long a3);
 147 extern void audit_syscall_exit(struct task_struct *task, int return_code);
 148 extern void audit_getname(const char *name);
 149 extern void audit_putname(const char *name);
 150 extern void audit_inode(const char *name, unsigned long ino, dev_t rdev);
 151
 152                                 /* Private API (for audit.c only) */
 153 extern int  audit_receive_filter(int type, int pid, int uid, int seq,
 154                                  void *data);
 155 extern void audit_get_stamp(struct audit_context *ctx,
 156                             struct timespec *t, int *serial);
 157 extern int  audit_set_loginuid(struct audit_context *ctx, uid_t loginuid);
 158 #else
 159 #define audit_alloc(t) ({ 0; })
 160 #define audit_free(t) do { ; } while (0)
 161 #define audit_syscall_entry(t,a,b,c,d,e) do { ; } while (0)
 162 #define audit_syscall_exit(t,r) do { ; } while (0)
 163 #define audit_getname(n) do { ; } while (0)
 164 #define audit_putname(n) do { ; } while (0)
 165 #define audit_inode(n,i,d) do { ; } while (0)
 166 #endif
 167
 168 #ifdef CONFIG_AUDIT
 169 /* These are defined in audit.c */
 170                                 /* Public API */
 171 extern void                 audit_log(struct audit_context *ctx,
 172                                       const char *fmt, ...)
 173                             __attribute__((format(printf,2,3)));
 174
 175 extern struct audit_buffer *audit_log_start(struct audit_context *ctx);
 176 extern void                 audit_log_format(struct audit_buffer *ab,
 177                                              const char *fmt, ...)
 178                             __attribute__((format(printf,2,3)));
 179 extern void                 audit_log_end(struct audit_buffer *ab);
 180 extern void                 audit_log_end_fast(struct audit_buffer *ab);
 181 extern void                 audit_log_end_irq(struct audit_buffer *ab);
 182 extern void                 audit_log_d_path(struct audit_buffer *ab,
 183                                              const char *prefix,
 184                                              struct dentry *dentry,
 185                                              struct vfsmount *vfsmnt);
 186 extern int                  audit_set_rate_limit(int limit);
 187 extern int                  audit_set_backlog_limit(int limit);
 188 extern int                  audit_set_enabled(int state);
 189 extern int                  audit_set_failure(int state);
 190
 191                                 /* Private API (for auditsc.c only) */
 192 extern void                 audit_send_reply(int pid, int seq, int type,
 193                                              int done, int multi,
 194                                              void *payload, int size);
 195 extern void                 audit_log_lost(const char *message);
 196 #else
 197 #define audit_log(t,f,...) do { ; } while (0)
 198 #define audit_log_start(t) ({ NULL; })
 199 #define audit_log_vformat(b,f,a) do { ; } while (0)
 200 #define audit_log_format(b,f,...) do { ; } while (0)
 201 #define audit_log_end(b) do { ; } while (0)
 202 #define audit_log_end_fast(b) do { ; } while (0)
 203 #define audit_log_end_irq(b) do { ; } while (0)
 204 #define audit_log_d_path(b,p,d,v) do { ; } while (0)
 205 #define audit_set_rate_limit(l) do { ; } while (0)
 206 #define audit_set_backlog_limit(l) do { ; } while (0)
 207 #define audit_set_enabled(s) do { ; } while (0)
 208 #define audit_set_failure(s) do { ; } while (0)
 209 #endif
 210 #endif
 211 #endif