include/linux/audit.h

   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 information */
  38 #define AUDIT_SIGNAL_INFO       1010    /* Get information about sender of signal*/
  39
  40 #define AUDIT_KERNEL            2000    /* Asynchronous audit record. NOT A REQUEST. */
  41
  42 /* Rule flags */
  43 #define AUDIT_PER_TASK 0x01     /* Apply rule at task creation (not syscall) */
  44 #define AUDIT_AT_ENTRY 0x02     /* Apply rule at syscall entry */
  45 #define AUDIT_AT_EXIT  0x04     /* Apply rule at syscall exit */
  46 #define AUDIT_PREPEND  0x10     /* Prepend to front of list */
  47
  48 /* Rule actions */
  49 #define AUDIT_NEVER    0        /* Do not build context if rule matches */
  50 #define AUDIT_POSSIBLE 1        /* Build context if rule matches  */
  51 #define AUDIT_ALWAYS   2        /* Generate audit record if rule matches */
  52
  53 /* Rule structure sizes -- if these change, different AUDIT_ADD and
  54  * AUDIT_LIST commands must be implemented. */
  55 #define AUDIT_MAX_FIELDS   64
  56 #define AUDIT_BITMASK_SIZE 64
  57 #define AUDIT_WORD(nr) ((__u32)((nr)/32))
  58 #define AUDIT_BIT(nr)  (1 << ((nr) - AUDIT_WORD(nr)*32))
  59
  60 /* Rule fields */
  61                                 /* These are useful when checking the
  62                                  * task structure at task creation time
  63                                  * (AUDIT_PER_TASK).  */
  64 #define AUDIT_PID       0
  65 #define AUDIT_UID       1
  66 #define AUDIT_EUID      2
  67 #define AUDIT_SUID      3
  68 #define AUDIT_FSUID     4
  69 #define AUDIT_GID       5
  70 #define AUDIT_EGID      6
  71 #define AUDIT_SGID      7
  72 #define AUDIT_FSGID     8
  73 #define AUDIT_LOGINUID  9
  74 #define AUDIT_PERS      10
  75 #define AUDIT_ARCH      11
  76
  77                                 /* These are ONLY useful when checking
  78                                  * at syscall exit time (AUDIT_AT_EXIT). */
  79 #define AUDIT_DEVMAJOR  100
  80 #define AUDIT_DEVMINOR  101
  81 #define AUDIT_INODE     102
  82 #define AUDIT_EXIT      103
  83 #define AUDIT_SUCCESS   104     /* exit >= 0; value ignored */
  84
  85 #define AUDIT_ARG0      200
  86 #define AUDIT_ARG1      (AUDIT_ARG0+1)
  87 #define AUDIT_ARG2      (AUDIT_ARG0+2)
  88 #define AUDIT_ARG3      (AUDIT_ARG0+3)
  89
  90 #define AUDIT_NEGATE    0x80000000
  91
  92
  93 /* Status symbols */
  94                                 /* Mask values */
  95 #define AUDIT_STATUS_ENABLED            0x0001
  96 #define AUDIT_STATUS_FAILURE            0x0002
  97 #define AUDIT_STATUS_PID                0x0004
  98 #define AUDIT_STATUS_RATE_LIMIT         0x0008
  99 #define AUDIT_STATUS_BACKLOG_LIMIT      0x0010
 100                                 /* Failure-to-log actions */
 101 #define AUDIT_FAIL_SILENT       0
 102 #define AUDIT_FAIL_PRINTK       1
 103 #define AUDIT_FAIL_PANIC        2
 104
 105 /* distinguish syscall tables */
 106 #define __AUDIT_ARCH_64BIT 0x80000000
 107 #define __AUDIT_ARCH_LE    0x40000000
 108 #define AUDIT_ARCH_ALPHA        (EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
 109 #define AUDIT_ARCH_ARM          (EM_ARM|__AUDIT_ARCH_LE)
 110 #define AUDIT_ARCH_ARMEB        (EM_ARM)
 111 #define AUDIT_ARCH_CRIS         (EM_CRIS|__AUDIT_ARCH_LE)
 112 #define AUDIT_ARCH_FRV          (EM_FRV)
 113 #define AUDIT_ARCH_H8300        (EM_H8_300)
 114 #define AUDIT_ARCH_I386         (EM_386|__AUDIT_ARCH_LE)
 115 #define AUDIT_ARCH_IA64         (EM_IA_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
 116 #define AUDIT_ARCH_M32R         (EM_M32R)
 117 #define AUDIT_ARCH_M68K         (EM_68K)
 118 #define AUDIT_ARCH_MIPS         (EM_MIPS)
 119 #define AUDIT_ARCH_MIPSEL       (EM_MIPS|__AUDIT_ARCH_LE)
 120 #define AUDIT_ARCH_MIPS64       (EM_MIPS|__AUDIT_ARCH_64BIT)
 121 #define AUDIT_ARCH_MIPSEL64     (EM_MIPS|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
 122 #define AUDIT_ARCH_PARISC       (EM_PARISC)
 123 #define AUDIT_ARCH_PARISC64     (EM_PARISC|__AUDIT_ARCH_64BIT)
 124 #define AUDIT_ARCH_PPC          (EM_PPC)
 125 #define AUDIT_ARCH_PPC64        (EM_PPC64|__AUDIT_ARCH_64BIT)
 126 #define AUDIT_ARCH_S390         (EM_S390)
 127 #define AUDIT_ARCH_S390X        (EM_S390|__AUDIT_ARCH_64BIT)
 128 #define AUDIT_ARCH_SH           (EM_SH)
 129 #define AUDIT_ARCH_SHEL         (EM_SH|__AUDIT_ARCH_LE)
 130 #define AUDIT_ARCH_SH64         (EM_SH|__AUDIT_ARCH_64BIT)
 131 #define AUDIT_ARCH_SHEL64       (EM_SH|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
 132 #define AUDIT_ARCH_SPARC        (EM_SPARC)
 133 #define AUDIT_ARCH_SPARC64      (EM_SPARC64|__AUDIT_ARCH_64BIT)
 134 #define AUDIT_ARCH_V850         (EM_V850|__AUDIT_ARCH_LE)
 135 #define AUDIT_ARCH_X86_64       (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
 136
 137 #ifndef __KERNEL__
 138 struct audit_message {
 139         struct nlmsghdr nlh;
 140         char            data[1200];
 141 };
 142 #endif
 143
 144 struct audit_status {
 145         __u32           mask;           /* Bit mask for valid entries */
 146         __u32           enabled;        /* 1 = enabled, 0 = disbaled */
 147         __u32           failure;        /* Failure-to-log action */
 148         __u32           pid;            /* pid of auditd process */
 149         __u32           rate_limit;     /* messages rate limit (per second) */
 150         __u32           backlog_limit;  /* waiting messages limit */
 151         __u32           lost;           /* messages lost */
 152         __u32           backlog;        /* messages waiting in queue */
 153 };
 154
 155 struct audit_rule {             /* for AUDIT_LIST, AUDIT_ADD, and AUDIT_DEL */
 156         __u32           flags;  /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */
 157         __u32           action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */
 158         __u32           field_count;
 159         __u32           mask[AUDIT_BITMASK_SIZE];
 160         __u32           fields[AUDIT_MAX_FIELDS];
 161         __u32           values[AUDIT_MAX_FIELDS];
 162 };
 163
 164 #ifdef __KERNEL__
 165
 166 struct audit_sig_info {
 167         uid_t           uid;
 168         pid_t           pid;
 169 };
 170
 171 struct audit_buffer;
 172 struct audit_context;
 173 struct inode;
 174
 175 #define AUDITSC_INVALID 0
 176 #define AUDITSC_SUCCESS 1
 177 #define AUDITSC_FAILURE 2
 178 #define AUDITSC_RESULT(x) ( ((long)(x))<0?AUDITSC_FAILURE:AUDITSC_SUCCESS )
 179 #ifdef CONFIG_AUDITSYSCALL
 180 /* These are defined in auditsc.c */
 181                                 /* Public API */
 182 extern int  audit_alloc(struct task_struct *task);
 183 extern void audit_free(struct task_struct *task);
 184 extern void audit_syscall_entry(struct task_struct *task, int arch,
 185                                 int major, unsigned long a0, unsigned long a1,
 186                                 unsigned long a2, unsigned long a3);
 187 extern void audit_syscall_exit(struct task_struct *task, int failed, long return_code);
 188 extern void audit_getname(const char *name);
 189 extern void audit_putname(const char *name);
 190 extern void audit_inode(const char *name, const struct inode *inode);
 191
 192                                 /* Private API (for audit.c only) */
 193 extern int  audit_receive_filter(int type, int pid, int uid, int seq,
 194                                  void *data, uid_t loginuid);
 195 extern int audit_get_stamp(struct audit_context *ctx,
 196                             struct timespec *t, unsigned int *serial);
 197 extern int  audit_set_loginuid(struct task_struct *task, uid_t loginuid);
 198 extern uid_t audit_get_loginuid(struct audit_context *ctx);
 199 extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
 200 extern void audit_signal_info(int sig, struct task_struct *t);
 201 #else
 202 #define audit_alloc(t) ({ 0; })
 203 #define audit_free(t) do { ; } while (0)
 204 #define audit_syscall_entry(t,ta,a,b,c,d,e) do { ; } while (0)
 205 #define audit_syscall_exit(t,f,r) do { ; } while (0)
 206 #define audit_getname(n) do { ; } while (0)
 207 #define audit_putname(n) do { ; } while (0)
 208 #define audit_inode(n,i) do { ; } while (0)
 209 #define audit_receive_filter(t,p,u,s,d,l) ({ -EOPNOTSUPP; })
 210 #define audit_get_stamp(c,t,s) ({ 0; })
 211 #define audit_get_loginuid(c) ({ -1; })
 212 #define audit_ipc_perms(q,u,g,m) ({ 0; })
 213 #define audit_signal_info(s,t) do { ; } while (0)
 214 #endif
 215
 216 #ifdef CONFIG_AUDIT
 217 /* These are defined in audit.c */
 218                                 /* Public API */
 219 #define audit_log(ctx, fmt, args...) \
 220         audit_log_type(ctx, AUDIT_KERNEL, 0, fmt, ##args)
 221 extern void                 audit_log_type(struct audit_context *ctx, int type,
 222                                       int pid, const char *fmt, ...)
 223                             __attribute__((format(printf,4,5)));
 224
 225 extern struct audit_buffer *audit_log_start(struct audit_context *ctx, int type,
 226                                             int pid);
 227 extern void                 audit_log_format(struct audit_buffer *ab,
 228                                              const char *fmt, ...)
 229                             __attribute__((format(printf,2,3)));
 230 extern void                 audit_log_end(struct audit_buffer *ab);
 231 extern void                 audit_log_hex(struct audit_buffer *ab,
 232                                           const unsigned char *buf,
 233                                           size_t len);
 234 extern void                 audit_log_untrustedstring(struct audit_buffer *ab,
 235                                                       const char *string);
 236 extern void                 audit_log_d_path(struct audit_buffer *ab,
 237                                              const char *prefix,
 238                                              struct dentry *dentry,
 239                                              struct vfsmount *vfsmnt);
 240                                 /* Private API (for auditsc.c only) */
 241 extern void                 audit_send_reply(int pid, int seq, int type,
 242                                              int done, int multi,
 243                                              void *payload, int size);
 244 extern void                 audit_log_lost(const char *message);
 245 #else
 246 #define audit_log(c,f,...) do { ; } while (0)
 247 #define audit_log_type(c,t,p,f,...) do { ; } while (0)
 248 #define audit_log_start(c,t,p) ({ NULL; })
 249 #define audit_log_vformat(b,f,a) do { ; } while (0)
 250 #define audit_log_format(b,f,...) do { ; } while (0)
 251 #define audit_log_end(b) do { ; } while (0)
 252 #define audit_log_hex(a,b,l) do { ; } while (0)
 253 #define audit_log_untrustedstring(a,s) do { ; } while (0)
 254 #define audit_log_d_path(b,p,d,v) do { ; } while (0)
 255 #endif
 256 #endif
 257 #endif