/* audit.h -- Auditing support

   *
   * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
   * All Rights Reserved.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   *
   * Written by Rickard E. (Rik) Faith <faith@redhat.com>
   *
   */
  
  #ifndef _LINUX_AUDIT_H_
  #define _LINUX_AUDIT_H_

  #include <linux/sched.h>
  #include <linux/elf.h>

  /* The netlink messages for the audit system is divided into blocks:
   * 1000 - 1099 are for commanding the audit system
   * 1100 - 1199 user space trusted application messages
   * 1200 - 1299 messages internal to the audit daemon
   * 1300 - 1399 audit event messages
   * 1400 - 1499 SE Linux use

   * 1500 - 1599 kernel LSPP events
   * 1600 - 1699 kernel crypto events

   * 1700 - 1799 kernel anomaly records
   * 1800 - 1999 future kernel use (maybe integrity labels and related events)

   * 2000 is for otherwise unclassified kernel audit messages (legacy)
   * 2001 - 2099 unused (kernel)
   * 2100 - 2199 user space anomaly records
   * 2200 - 2299 user space actions taken in response to anomalies
   * 2300 - 2399 user space generated LSPP events
   * 2400 - 2499 user space crypto events
   * 2500 - 2999 future user space (maybe integrity labels and related events)

   *

   * Messages from 1000-1199 are bi-directional. 1200-1299 & 2100 - 2999 are
   * exclusively user space. 1300-2099 is kernel --> user space 
   * communication.

   */

  #define AUDIT_GET		1000	/* Get status */
  #define AUDIT_SET		1001	/* Set status (enable/disable/auditd) */

  #define AUDIT_LIST		1002	/* List syscall rules -- deprecated */
  #define AUDIT_ADD		1003	/* Add syscall rule -- deprecated */
  #define AUDIT_DEL		1004	/* Delete syscall rule -- deprecated */

  #define AUDIT_USER		1005	/* Message from userspace -- deprecated */

  #define AUDIT_LOGIN		1006	/* Define the login id and information */

  #define AUDIT_WATCH_INS		1007	/* Insert file/dir watch entry */
  #define AUDIT_WATCH_REM		1008	/* Remove file/dir watch entry */
  #define AUDIT_WATCH_LIST	1009	/* List all file/dir watches */
  #define AUDIT_SIGNAL_INFO	1010	/* Get info about sender of signal to auditd */

  #define AUDIT_ADD_RULE		1011	/* Add syscall filtering rule */
  #define AUDIT_DEL_RULE		1012	/* Delete syscall filtering rule */
  #define AUDIT_LIST_RULES	1013	/* List syscall filtering rules */

  #define AUDIT_FIRST_USER_MSG	1100	/* Userspace messages mostly uninteresting to kernel */
  #define AUDIT_USER_AVC		1107	/* We filter this differently */

  #define AUDIT_LAST_USER_MSG	1199

  #define AUDIT_FIRST_USER_MSG2	2100	/* More user space messages */
  #define AUDIT_LAST_USER_MSG2	2999

   
  #define AUDIT_DAEMON_START      1200    /* Daemon startup record */
  #define AUDIT_DAEMON_END        1201    /* Daemon normal stop record */
  #define AUDIT_DAEMON_ABORT      1202    /* Daemon error stop record */
  #define AUDIT_DAEMON_CONFIG     1203    /* Daemon config change */
  
  #define AUDIT_SYSCALL		1300	/* Syscall event */
  #define AUDIT_FS_WATCH		1301	/* Filesystem watch event */

  #define AUDIT_PATH		1302	/* Filename path information */

  #define AUDIT_IPC		1303	/* IPC record */

  #define AUDIT_SOCKETCALL	1304	/* sys_socketcall arguments */

  #define AUDIT_CONFIG_CHANGE	1305	/* Audit system configuration change */

  #define AUDIT_SOCKADDR		1306	/* sockaddr copied as syscall arg */

  #define AUDIT_CWD		1307	/* Current working directory */

  
  #define AUDIT_AVC		1400	/* SE Linux avc denial or grant */
  #define AUDIT_SELINUX_ERR	1401	/* Internal SE Linux Errors */

  #define AUDIT_AVC_PATH		1402	/* dentry, vfsmount pair from avc */

  #define AUDIT_MAC_POLICY_LOAD	1403	/* Policy file load */
  #define AUDIT_MAC_STATUS	1404	/* Changed enforcing,permissive,off */
  #define AUDIT_MAC_CONFIG_CHANGE	1405	/* Changes to booleans */

  #define AUDIT_FIRST_KERN_ANOM_MSG   1700
  #define AUDIT_LAST_KERN_ANOM_MSG    1799
  #define AUDIT_ANOM_PROMISCUOUS      1700 /* Device changed promiscuous mode */

  #define AUDIT_KERNEL		2000	/* Asynchronous audit record. NOT A REQUEST. */

  
  /* Rule flags */

  #define AUDIT_FILTER_USER	0x00	/* Apply rule to user-generated messages */
  #define AUDIT_FILTER_TASK	0x01	/* Apply rule at task creation (not syscall) */
  #define AUDIT_FILTER_ENTRY	0x02	/* Apply rule at syscall entry */
  #define AUDIT_FILTER_WATCH	0x03	/* Apply rule to file system watches */
  #define AUDIT_FILTER_EXIT	0x04	/* Apply rule at syscall exit */

  #define AUDIT_FILTER_TYPE	0x05	/* Apply rule at audit_log_start */

  #define AUDIT_NR_FILTERS	6

  
  #define AUDIT_FILTER_PREPEND	0x10	/* Prepend to front of list */

  
  /* Rule actions */
  #define AUDIT_NEVER    0	/* Do not build context if rule matches */
  #define AUDIT_POSSIBLE 1	/* Build context if rule matches  */
  #define AUDIT_ALWAYS   2	/* Generate audit record if rule matches */
  
  /* Rule structure sizes -- if these change, different AUDIT_ADD and
   * AUDIT_LIST commands must be implemented. */
  #define AUDIT_MAX_FIELDS   64
  #define AUDIT_BITMASK_SIZE 64
  #define AUDIT_WORD(nr) ((__u32)((nr)/32))
  #define AUDIT_BIT(nr)  (1 << ((nr) - AUDIT_WORD(nr)*32))

  /* This bitmask is used to validate user input.  It represents all bits that
   * are currently used in an audit field constant understood by the kernel.
   * If you are adding a new #define AUDIT_<whatever>, please ensure that
   * AUDIT_UNUSED_BITS is updated if need be. */
  #define AUDIT_UNUSED_BITS	0x0FFFFC00

  /* Rule fields */
  				/* These are useful when checking the
  				 * task structure at task creation time
  				 * (AUDIT_PER_TASK).  */
  #define AUDIT_PID	0
  #define AUDIT_UID	1
  #define AUDIT_EUID	2
  #define AUDIT_SUID	3
  #define AUDIT_FSUID	4
  #define AUDIT_GID	5
  #define AUDIT_EGID	6
  #define AUDIT_SGID	7
  #define AUDIT_FSGID	8
  #define AUDIT_LOGINUID	9
  #define AUDIT_PERS	10

  #define AUDIT_ARCH	11

  #define AUDIT_MSGTYPE	12

  #define AUDIT_SE_USER	13	/* security label user */
  #define AUDIT_SE_ROLE	14	/* security label role */
  #define AUDIT_SE_TYPE	15	/* security label type */
  #define AUDIT_SE_SEN	16	/* security label sensitivity label */
  #define AUDIT_SE_CLR	17	/* security label clearance label */

  
  				/* These are ONLY useful when checking
  				 * at syscall exit time (AUDIT_AT_EXIT). */
  #define AUDIT_DEVMAJOR	100
  #define AUDIT_DEVMINOR	101
  #define AUDIT_INODE	102
  #define AUDIT_EXIT	103
  #define AUDIT_SUCCESS   104	/* exit >= 0; value ignored */
  
  #define AUDIT_ARG0      200
  #define AUDIT_ARG1      (AUDIT_ARG0+1)
  #define AUDIT_ARG2      (AUDIT_ARG0+2)
  #define AUDIT_ARG3      (AUDIT_ARG0+3)

  #define AUDIT_NEGATE			0x80000000
  
  /* These are the supported operators.
   *	4  2  1
   *	=  >  <
   *	-------
   *	0  0  0		0	nonsense
   *	0  0  1		1	<
   *	0  1  0		2	>
   *	0  1  1		3	!=
   *	1  0  0		4	=
   *	1  0  1		5	<=
   *	1  1  0		6	>=
   *	1  1  1		7	all operators
   */
  #define AUDIT_LESS_THAN			0x10000000
  #define AUDIT_GREATER_THAN		0x20000000
  #define AUDIT_NOT_EQUAL			0x30000000
  #define AUDIT_EQUAL			0x40000000
  #define AUDIT_LESS_THAN_OR_EQUAL	(AUDIT_LESS_THAN|AUDIT_EQUAL)
  #define AUDIT_GREATER_THAN_OR_EQUAL	(AUDIT_GREATER_THAN|AUDIT_EQUAL)
  #define AUDIT_OPERATORS			(AUDIT_EQUAL|AUDIT_NOT_EQUAL)

  
  /* Status symbols */
  				/* Mask values */
  #define AUDIT_STATUS_ENABLED		0x0001
  #define AUDIT_STATUS_FAILURE		0x0002
  #define AUDIT_STATUS_PID		0x0004
  #define AUDIT_STATUS_RATE_LIMIT		0x0008
  #define AUDIT_STATUS_BACKLOG_LIMIT	0x0010
  				/* Failure-to-log actions */
  #define AUDIT_FAIL_SILENT	0
  #define AUDIT_FAIL_PRINTK	1
  #define AUDIT_FAIL_PANIC	2

  /* distinguish syscall tables */
  #define __AUDIT_ARCH_64BIT 0x80000000
  #define __AUDIT_ARCH_LE	   0x40000000
  #define AUDIT_ARCH_ALPHA	(EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_ARM		(EM_ARM|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_ARMEB	(EM_ARM)
  #define AUDIT_ARCH_CRIS		(EM_CRIS|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_FRV		(EM_FRV)
  #define AUDIT_ARCH_H8300	(EM_H8_300)
  #define AUDIT_ARCH_I386		(EM_386|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_IA64		(EM_IA_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_M32R		(EM_M32R)
  #define AUDIT_ARCH_M68K		(EM_68K)
  #define AUDIT_ARCH_MIPS		(EM_MIPS)
  #define AUDIT_ARCH_MIPSEL	(EM_MIPS|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_MIPS64	(EM_MIPS|__AUDIT_ARCH_64BIT)
  #define AUDIT_ARCH_MIPSEL64	(EM_MIPS|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_PARISC	(EM_PARISC)
  #define AUDIT_ARCH_PARISC64	(EM_PARISC|__AUDIT_ARCH_64BIT)
  #define AUDIT_ARCH_PPC		(EM_PPC)
  #define AUDIT_ARCH_PPC64	(EM_PPC64|__AUDIT_ARCH_64BIT)
  #define AUDIT_ARCH_S390		(EM_S390)
  #define AUDIT_ARCH_S390X	(EM_S390|__AUDIT_ARCH_64BIT)
  #define AUDIT_ARCH_SH		(EM_SH)
  #define AUDIT_ARCH_SHEL		(EM_SH|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_SH64		(EM_SH|__AUDIT_ARCH_64BIT)
  #define AUDIT_ARCH_SHEL64	(EM_SH|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_SPARC	(EM_SPARC)

  #define AUDIT_ARCH_SPARC64	(EM_SPARCV9|__AUDIT_ARCH_64BIT)

  #define AUDIT_ARCH_V850		(EM_V850|__AUDIT_ARCH_LE)
  #define AUDIT_ARCH_X86_64	(EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)

  struct audit_status {
  	__u32		mask;		/* Bit mask for valid entries */

  	__u32		enabled;	/* 1 = enabled, 0 = disabled */

  	__u32		failure;	/* Failure-to-log action */
  	__u32		pid;		/* pid of auditd process */
  	__u32		rate_limit;	/* messages rate limit (per second) */
  	__u32		backlog_limit;	/* waiting messages limit */
  	__u32		lost;		/* messages lost */
  	__u32		backlog;	/* messages waiting in queue */
  };

  /* audit_rule_data supports filter rules with both integer and string
   * fields.  It corresponds with AUDIT_ADD_RULE, AUDIT_DEL_RULE and
   * AUDIT_LIST_RULES requests.
   */
  struct audit_rule_data {
  	__u32		flags;	/* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */
  	__u32		action;	/* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */
  	__u32		field_count;

  	__u32		mask[AUDIT_BITMASK_SIZE]; /* syscall(s) affected */

  	__u32		fields[AUDIT_MAX_FIELDS];
  	__u32		values[AUDIT_MAX_FIELDS];
  	__u32		fieldflags[AUDIT_MAX_FIELDS];
  	__u32		buflen;	/* total length of string fields */
  	char		buf[0];	/* string fields buffer */
  };
  
  /* audit_rule is supported to maintain backward compatibility with
   * userspace.  It supports integer fields only and corresponds to
   * AUDIT_ADD, AUDIT_DEL and AUDIT_LIST requests.
   */

  struct audit_rule {		/* for AUDIT_LIST, AUDIT_ADD, and AUDIT_DEL */
  	__u32		flags;	/* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */
  	__u32		action;	/* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */
  	__u32		field_count;
  	__u32		mask[AUDIT_BITMASK_SIZE];
  	__u32		fields[AUDIT_MAX_FIELDS];
  	__u32		values[AUDIT_MAX_FIELDS];
  };
  
  #ifdef __KERNEL__

  struct audit_sig_info {
  	uid_t		uid;
  	pid_t		pid;
  };

  struct audit_buffer;
  struct audit_context;
  struct inode;

  struct netlink_skb_parms;

  #define AUDITSC_INVALID 0
  #define AUDITSC_SUCCESS 1
  #define AUDITSC_FAILURE 2
  #define AUDITSC_RESULT(x) ( ((long)(x))<0?AUDITSC_FAILURE:AUDITSC_SUCCESS )

  #ifdef CONFIG_AUDITSYSCALL
  /* These are defined in auditsc.c */
  				/* Public API */
  extern int  audit_alloc(struct task_struct *task);
  extern void audit_free(struct task_struct *task);

  extern void audit_syscall_entry(int arch,

  				int major, unsigned long a0, unsigned long a1,
  				unsigned long a2, unsigned long a3);

  extern void audit_syscall_exit(int failed, long return_code);

  extern void audit_getname(const char *name);
  extern void audit_putname(const char *name);

  extern void __audit_inode(const char *name, const struct inode *inode, unsigned flags);
  extern void __audit_inode_child(const char *dname, const struct inode *inode,
  				unsigned long pino);
  static inline void audit_inode(const char *name, const struct inode *inode,
  			       unsigned flags) {
  	if (unlikely(current->audit_context))
  		__audit_inode(name, inode, flags);
  }
  static inline void audit_inode_child(const char *dname, 
  				     const struct inode *inode, 
  				     unsigned long pino) {
  	if (unlikely(current->audit_context))
  		__audit_inode_child(dname, inode, pino);
  }

  
  				/* Private API (for audit.c only) */

  extern unsigned int audit_serial(void);
  extern void auditsc_get_stamp(struct audit_context *ctx,
  			      struct timespec *t, unsigned int *serial);

  extern int  audit_set_loginuid(struct task_struct *task, uid_t loginuid);

  extern uid_t audit_get_loginuid(struct audit_context *ctx);

  extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp);

  extern int audit_socketcall(int nargs, unsigned long *args);
  extern int audit_sockaddr(int len, void *addr);

  extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);

  extern void audit_signal_info(int sig, struct task_struct *t);

  extern int audit_set_macxattr(const char *name);

  #else
  #define audit_alloc(t) ({ 0; })
  #define audit_free(t) do { ; } while (0)

  #define audit_syscall_entry(ta,a,b,c,d,e) do { ; } while (0)
  #define audit_syscall_exit(f,r) do { ; } while (0)

  #define audit_getname(n) do { ; } while (0)
  #define audit_putname(n) do { ; } while (0)

  #define __audit_inode(n,i,f) do { ; } while (0)
  #define __audit_inode_child(d,i,p) do { ; } while (0)

  #define audit_inode(n,i,f) do { ; } while (0)

  #define audit_inode_child(d,i,p) do { ; } while (0)

  #define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)

  #define audit_get_loginuid(c) ({ -1; })

  #define audit_ipc_perms(q,u,g,m,i) ({ 0; })

  #define audit_socketcall(n,a) ({ 0; })
  #define audit_sockaddr(len, addr) ({ 0; })

  #define audit_avc_path(dentry, mnt) ({ 0; })

  #define audit_signal_info(s,t) do { ; } while (0)

  #define audit_set_macxattr(n) do { ; } while (0)

  #endif
  
  #ifdef CONFIG_AUDIT
  /* These are defined in audit.c */
  				/* Public API */

  extern void		    audit_log(struct audit_context *ctx, gfp_t gfp_mask,

  				      int type, const char *fmt, ...)
  				      __attribute__((format(printf,4,5)));

  extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);

  extern void		    audit_log_format(struct audit_buffer *ab,
  					     const char *fmt, ...)
  			    __attribute__((format(printf,2,3)));
  extern void		    audit_log_end(struct audit_buffer *ab);

  extern void		    audit_log_hex(struct audit_buffer *ab,
  					  const unsigned char *buf,
  					  size_t len);
  extern void		    audit_log_untrustedstring(struct audit_buffer *ab,
  						      const char *string);

  extern void		    audit_log_d_path(struct audit_buffer *ab,
  					     const char *prefix,
  					     struct dentry *dentry,
  					     struct vfsmount *vfsmnt);

  				/* Private API (for audit.c only) */
  extern int audit_filter_user(struct netlink_skb_parms *cb, int type);
  extern int audit_filter_type(int type);
  extern int  audit_receive_filter(int type, int pid, int uid, int seq,

  			 void *data, size_t datasz, uid_t loginuid, u32 sid);

  #else

  #define audit_log(c,g,t,f,...) do { ; } while (0)

  #define audit_log_start(c,g,t) ({ NULL; })

  #define audit_log_vformat(b,f,a) do { ; } while (0)
  #define audit_log_format(b,f,...) do { ; } while (0)
  #define audit_log_end(b) do { ; } while (0)

  #define audit_log_hex(a,b,l) do { ; } while (0)
  #define audit_log_untrustedstring(a,s) do { ; } while (0)

  #define audit_log_d_path(b,p,d,v) do { ; } while (0)

  #define audit_panic(m) do { ; } while (0)

  #endif
  #endif
  #endif