/* 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/ptrace.h>

  #include <uapi/linux/audit.h>

  #define AUDIT_INO_UNSET ((unsigned long)-1)
  #define AUDIT_DEV_UNSET ((dev_t)-1)

  struct audit_sig_info {
  	uid_t		uid;
  	pid_t		pid;

  	char		ctx[0];

  };

  struct audit_buffer;
  struct audit_context;
  struct inode;

  struct netlink_skb_parms;

  struct path;

  struct linux_binprm;

  struct mq_attr;
  struct mqstat;

  struct audit_watch;
  struct audit_tree;

  struct sk_buff;

  
  struct audit_krule {

  	u32			pflags;

  	u32			flags;
  	u32			listnr;
  	u32			action;
  	u32			mask[AUDIT_BITMASK_SIZE];
  	u32			buflen; /* for data alloc on list rules */
  	u32			field_count;
  	char			*filterkey; /* ties events to rules */
  	struct audit_field	*fields;
  	struct audit_field	*arch_f; /* quick access to arch field */
  	struct audit_field	*inode_f; /* quick access to an inode field */
  	struct audit_watch	*watch;	/* associated watch */
  	struct audit_tree	*tree;	/* associated watched tree */

  	struct audit_fsnotify_mark	*exe;

  	struct list_head	rlist;	/* entry in audit_{watch,tree}.rules list */

  	struct list_head	list;	/* for AUDIT_LIST* purposes only */

  	u64			prio;

  };

  /* Flag to indicate legacy AUDIT_LOGINUID unset usage */
  #define AUDIT_LOGINUID_LEGACY		0x1

  struct audit_field {
  	u32				type;

  	union {
  		u32			val;
  		kuid_t			uid;
  		kgid_t			gid;
  		struct {
  			char		*lsm_str;
  			void		*lsm_rule;
  		};
  	};

  	u32				op;

  };

  extern int is_audit_feature_set(int which);

  extern int __init audit_register_class(int class, unsigned *list);

  extern int audit_classify_syscall(int abi, unsigned syscall);

  extern int audit_classify_arch(int arch);

  /* only for compat system calls */
  extern unsigned compat_write_class[];
  extern unsigned compat_read_class[];
  extern unsigned compat_dir_class[];
  extern unsigned compat_chattr_class[];
  extern unsigned compat_signal_class[];

  extern int audit_classify_compat_syscall(int abi, unsigned syscall);

  
  /* audit_names->type values */
  #define	AUDIT_TYPE_UNKNOWN	0	/* we don't know yet */
  #define	AUDIT_TYPE_NORMAL	1	/* a "normal" audit record */

  #define	AUDIT_TYPE_PARENT	2	/* a parent audit record */

  #define	AUDIT_TYPE_CHILD_DELETE 3	/* a child being deleted */
  #define	AUDIT_TYPE_CHILD_CREATE 4	/* a child being created */

  /* maximized args number that audit_socketcall can process */
  #define AUDITSC_ARGS		6

  /* bit values for ->signal->audit_tty */
  #define AUDIT_TTY_ENABLE	BIT(0)
  #define AUDIT_TTY_LOG_PASSWD	BIT(1)

  struct filename;

  extern void audit_log_session_info(struct audit_buffer *ab);

  #ifdef CONFIG_AUDIT
  /* These are defined in audit.c */
  				/* Public API */
  extern __printf(4, 5)
  void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
  	       const char *fmt, ...);
  
  extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
  extern __printf(2, 3)
  void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
  extern void		    audit_log_end(struct audit_buffer *ab);
  extern bool		    audit_string_contains_control(const char *string,
  							  size_t len);
  extern void		    audit_log_n_hex(struct audit_buffer *ab,
  					  const unsigned char *buf,
  					  size_t len);
  extern void		    audit_log_n_string(struct audit_buffer *ab,
  					       const char *buf,
  					       size_t n);
  extern void		    audit_log_n_untrustedstring(struct audit_buffer *ab,
  							const char *string,
  							size_t n);
  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,
  					     const struct path *path);
  extern void		    audit_log_key(struct audit_buffer *ab,
  					  char *key);
  extern void		    audit_log_link_denied(const char *operation,
  						  struct path *link);
  extern void		    audit_log_lost(const char *message);
  #ifdef CONFIG_SECURITY
  extern void 		    audit_log_secctx(struct audit_buffer *ab, u32 secid);
  #else
  static inline void	    audit_log_secctx(struct audit_buffer *ab, u32 secid)
  { }
  #endif
  
  extern int audit_log_task_context(struct audit_buffer *ab);
  extern void audit_log_task_info(struct audit_buffer *ab,
  				struct task_struct *tsk);
  
  extern int		    audit_update_lsm_rules(void);
  
  				/* Private API (for audit.c only) */

  extern int audit_rule_change(int type, __u32 portid, int seq,
  				void *data, size_t datasz);
  extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
  
  extern u32 audit_enabled;
  #else /* CONFIG_AUDIT */
  static inline __printf(4, 5)
  void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
  	       const char *fmt, ...)
  { }
  static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
  						   gfp_t gfp_mask, int type)
  {
  	return NULL;
  }
  static inline __printf(2, 3)
  void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
  { }
  static inline void audit_log_end(struct audit_buffer *ab)
  { }
  static inline void audit_log_n_hex(struct audit_buffer *ab,
  				   const unsigned char *buf, size_t len)
  { }
  static inline void audit_log_n_string(struct audit_buffer *ab,
  				      const char *buf, size_t n)
  { }
  static inline void  audit_log_n_untrustedstring(struct audit_buffer *ab,
  						const char *string, size_t n)
  { }
  static inline void audit_log_untrustedstring(struct audit_buffer *ab,
  					     const char *string)
  { }
  static inline void audit_log_d_path(struct audit_buffer *ab,
  				    const char *prefix,
  				    const struct path *path)
  { }
  static inline void audit_log_key(struct audit_buffer *ab, char *key)
  { }
  static inline void audit_log_link_denied(const char *string,
  					 const struct path *link)
  { }
  static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
  { }
  static inline int audit_log_task_context(struct audit_buffer *ab)
  {
  	return 0;
  }
  static inline void audit_log_task_info(struct audit_buffer *ab,
  				       struct task_struct *tsk)
  { }
  #define audit_enabled 0
  #endif /* CONFIG_AUDIT */

  #ifdef CONFIG_AUDIT_COMPAT_GENERIC

  #define audit_is_compat(arch)  (!((arch) & __AUDIT_ARCH_64BIT))
  #else
  #define audit_is_compat(arch)  false
  #endif

  #ifdef CONFIG_AUDITSYSCALL

  #include <asm/syscall.h> /* for syscall_get_arch() */

  /* 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 major, unsigned long a0, unsigned long a1,

  				  unsigned long a2, unsigned long a3);

  extern void __audit_syscall_exit(int ret_success, long ret_value);

  extern struct filename *__audit_reusename(const __user char *uptr);

  extern void __audit_getname(struct filename *name);

  
  #define AUDIT_INODE_PARENT	1	/* dentry represents the parent */
  #define AUDIT_INODE_HIDDEN	2	/* audit record should be hidden */

  extern void __audit_inode(struct filename *name, const struct dentry *dentry,

  				unsigned int flags);

  extern void __audit_file(const struct file *);

  extern void __audit_inode_child(struct inode *parent,

  				const struct dentry *dentry,
  				const unsigned char type);

  extern void __audit_seccomp(unsigned long syscall, long signr, int code);

  extern void __audit_ptrace(struct task_struct *t);

  static inline bool audit_dummy_context(void)

  {
  	void *p = current->audit_context;
  	return !p || *(int *)p;
  }

  static inline void audit_free(struct task_struct *task)
  {
  	if (unlikely(task->audit_context))
  		__audit_free(task);
  }

  static inline void audit_syscall_entry(int major, unsigned long a0,

  				       unsigned long a1, unsigned long a2,
  				       unsigned long a3)
  {

  	if (unlikely(current->audit_context))

  		__audit_syscall_entry(major, a0, a1, a2, a3);

  }

  static inline void audit_syscall_exit(void *pt_regs)
  {
  	if (unlikely(current->audit_context)) {
  		int success = is_syscall_success(pt_regs);

  		long return_code = regs_return_value(pt_regs);

  
  		__audit_syscall_exit(success, return_code);
  	}
  }

  static inline struct filename *audit_reusename(const __user char *name)
  {
  	if (unlikely(!audit_dummy_context()))
  		return __audit_reusename(name);
  	return NULL;
  }

  static inline void audit_getname(struct filename *name)

  {

  	if (unlikely(!audit_dummy_context()))

  		__audit_getname(name);
  }

  static inline void audit_inode(struct filename *name,
  				const struct dentry *dentry,

  				unsigned int parent) {

  	if (unlikely(!audit_dummy_context())) {
  		unsigned int flags = 0;
  		if (parent)
  			flags |= AUDIT_INODE_PARENT;
  		__audit_inode(name, dentry, flags);
  	}
  }

  static inline void audit_file(struct file *file)
  {
  	if (unlikely(!audit_dummy_context()))
  		__audit_file(file);
  }

  static inline void audit_inode_parent_hidden(struct filename *name,
  						const struct dentry *dentry)
  {

  	if (unlikely(!audit_dummy_context()))

  		__audit_inode(name, dentry,
  				AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);

  }

  static inline void audit_inode_child(struct inode *parent,

  				     const struct dentry *dentry,
  				     const unsigned char type) {

  	if (unlikely(!audit_dummy_context()))

  		__audit_inode_child(parent, dentry, type);

  }

  void audit_core_dumps(long signr);

  static inline void audit_seccomp(unsigned long syscall, long signr, int code)

  {

  	if (!audit_enabled)
  		return;

  	/* Force a record to be reported if a signal was delivered. */
  	if (signr || unlikely(!audit_dummy_context()))

  		__audit_seccomp(syscall, signr, code);

  }

  static inline void audit_ptrace(struct task_struct *t)
  {
  	if (unlikely(!audit_dummy_context()))
  		__audit_ptrace(t);
  }

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

  extern unsigned int audit_serial(void);

  extern int auditsc_get_stamp(struct audit_context *ctx,

  			      struct timespec *t, unsigned int *serial);

  extern int audit_set_loginuid(kuid_t loginuid);
  
  static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
  {
  	return tsk->loginuid;
  }

  static inline unsigned int audit_get_sessionid(struct task_struct *tsk)

  {
  	return tsk->sessionid;
  }

  extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);

  extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);

  extern void __audit_bprm(struct linux_binprm *bprm);

  extern int __audit_socketcall(int nargs, unsigned long *args);

  extern int __audit_sockaddr(int len, void *addr);

  extern void __audit_fd_pair(int fd1, int fd2);

  extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);

  extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);

  extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);

  extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);

  extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
  				  const struct cred *new,
  				  const struct cred *old);

  extern void __audit_log_capset(const struct cred *new, const struct cred *old);

  extern void __audit_mmap_fd(int fd, int flags);

  static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)

  {

  	if (unlikely(!audit_dummy_context()))

  		__audit_ipc_obj(ipcp);

  }

  static inline void audit_fd_pair(int fd1, int fd2)

  {

  	if (unlikely(!audit_dummy_context()))

  		__audit_fd_pair(fd1, fd2);

  }

  static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)

  {

  	if (unlikely(!audit_dummy_context()))

  		__audit_ipc_set_perm(qbytes, uid, gid, mode);

  }

  static inline void audit_bprm(struct linux_binprm *bprm)

  {
  	if (unlikely(!audit_dummy_context()))

  		__audit_bprm(bprm);

  }

  static inline int audit_socketcall(int nargs, unsigned long *args)

  {
  	if (unlikely(!audit_dummy_context()))

  		return __audit_socketcall(nargs, args);
  	return 0;

  }
  static inline int audit_sockaddr(int len, void *addr)
  {
  	if (unlikely(!audit_dummy_context()))
  		return __audit_sockaddr(len, addr);
  	return 0;
  }

  static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)

  {

  	if (unlikely(!audit_dummy_context()))

  		__audit_mq_open(oflag, mode, attr);

  }

  static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)

  {

  	if (unlikely(!audit_dummy_context()))

  		__audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);

  }

  static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)

  {

  	if (unlikely(!audit_dummy_context()))

  		__audit_mq_notify(mqdes, notification);

  }

  static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)

  {

  	if (unlikely(!audit_dummy_context()))

  		__audit_mq_getsetattr(mqdes, mqstat);

  }

  static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
  				       const struct cred *new,
  				       const struct cred *old)

  {
  	if (unlikely(!audit_dummy_context()))

  		return __audit_log_bprm_fcaps(bprm, new, old);
  	return 0;

  }

  static inline void audit_log_capset(const struct cred *new,

  				   const struct cred *old)

  {
  	if (unlikely(!audit_dummy_context()))

  		__audit_log_capset(new, old);

  }

  static inline void audit_mmap_fd(int fd, int flags)
  {
  	if (unlikely(!audit_dummy_context()))
  		__audit_mmap_fd(fd, flags);
  }

  extern int audit_n_rules;

  extern int audit_signals;

  #else /* CONFIG_AUDITSYSCALL */

  static inline int audit_alloc(struct task_struct *task)
  {
  	return 0;
  }
  static inline void audit_free(struct task_struct *task)
  { }

  static inline void audit_syscall_entry(int major, unsigned long a0,

  				       unsigned long a1, unsigned long a2,
  				       unsigned long a3)
  { }
  static inline void audit_syscall_exit(void *pt_regs)
  { }

  static inline bool audit_dummy_context(void)

  {

  	return true;

  }

  static inline struct filename *audit_reusename(const __user char *name)
  {
  	return NULL;
  }

  static inline void audit_getname(struct filename *name)

  { }

  static inline void __audit_inode(struct filename *name,
  					const struct dentry *dentry,

  					unsigned int flags)

  { }

  static inline void __audit_inode_child(struct inode *parent,

  					const struct dentry *dentry,
  					const unsigned char type)

  { }

  static inline void audit_inode(struct filename *name,
  				const struct dentry *dentry,

  				unsigned int parent)

  { }

  static inline void audit_file(struct file *file)
  {
  }

  static inline void audit_inode_parent_hidden(struct filename *name,
  				const struct dentry *dentry)
  { }

  static inline void audit_inode_child(struct inode *parent,

  				     const struct dentry *dentry,
  				     const unsigned char type)

  { }
  static inline void audit_core_dumps(long signr)
  { }
  static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
  { }
  static inline void audit_seccomp(unsigned long syscall, long signr, int code)
  { }
  static inline int auditsc_get_stamp(struct audit_context *ctx,
  			      struct timespec *t, unsigned int *serial)
  {
  	return 0;
  }
  static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
  {
  	return INVALID_UID;
  }

  static inline unsigned int audit_get_sessionid(struct task_struct *tsk)

  {
  	return -1;
  }

  static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
  { }
  static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
  					gid_t gid, umode_t mode)
  { }

  static inline void audit_bprm(struct linux_binprm *bprm)
  { }

  static inline int audit_socketcall(int nargs, unsigned long *args)
  {
  	return 0;
  }

  static inline void audit_fd_pair(int fd1, int fd2)
  { }
  static inline int audit_sockaddr(int len, void *addr)
  {
  	return 0;
  }
  static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
  { }
  static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
  				     unsigned int msg_prio,
  				     const struct timespec *abs_timeout)
  { }
  static inline void audit_mq_notify(mqd_t mqdes,
  				   const struct sigevent *notification)
  { }
  static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
  { }
  static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
  				       const struct cred *new,
  				       const struct cred *old)
  {
  	return 0;
  }

  static inline void audit_log_capset(const struct cred *new,
  				    const struct cred *old)

  { }
  static inline void audit_mmap_fd(int fd, int flags)
  { }
  static inline void audit_ptrace(struct task_struct *t)
  { }

  #define audit_n_rules 0

  #define audit_signals 0

  #endif /* CONFIG_AUDITSYSCALL */

  static inline bool audit_loginuid_set(struct task_struct *tsk)
  {
  	return uid_valid(audit_get_loginuid(tsk));
  }

  static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
  {
  	audit_log_n_string(ab, buf, strlen(buf));
  }

  #endif